FUEL INJECTION CONTROL METHOD FOR PROTECTING INJECTOR TIP
One aspect of the present invention the method and the device relates to injector tip protection for fuel injection number the number, width and depth is provided port injection (Port Fuel Injection, PFI) gasoline direct injector spray welding (Gasoline Direct Injection, GDI) with mode-switching in a dual injection engine, GDI injector injector tip to prevent its overheating the method of fuel injection for an internal number and number to the device are disclosed. The subject matter disclosed portion of the present invention in the embodiment are reduced only and not the configuration number [...] prior art for background information. In particular we shall have been utilized in the field of long-cycle-internal combustion engine includes various electricity to a kind described ducting etc.. Improving performance of the power plant with a thermal expansion among direct injection (GDI; Gasoline Direct Injection) gasoline engine of enhancement due to the gradually replace existing port injection (PFI; Port Fuel Injection) engine etc.. However, GDI engine is fuel injected at which location a portion of the particulate matter and contamination of the atmospheric generated may have the disadvantages described. Thus the number key can not get through a number PN [...] PM (Paticulate Mass) and said opening (Paticulate Number) policy which introduces a billion, vehicle number solution for reducing particulate matter also demonstrates various small entities his way. One of the turned on when the direct injection and port injection that the alternatively number (PDI; PFI and GDI) double injection engine are disclosed. Double injection engine port injection injector specific operating zone by existing direct injection engine adding desired ratio to be employed consists of injection systems. For example, the dispensing of particulate matter in many therefore using jet port, the load in the area of the direct injection type consonant and performance and has, in the area of the two jet fuel is using all is more than necessary. On the other hand, in the case of gasoline direct injection (GDI) in the cylinder of the direct fuel injection (PFI) then existing port combustion such as compared to the Optocomponents improved combustion efficiency. The cylinder of the fuel injection system for directly injecting the GDI injector distal tip portion is exposed to the combustion chamber inside the cylinder of the inclination of the substrate. Thereby decreasing the temperature of the combustion chamber mounted on the outside of the cylindrical electrode GDI injector PFI injector contrast is equal to high temperature. The cylindrical electrode is allowed some long time when exposed injector tip temperature higher than mechanical damage due to thermal stress, soot can be cause clogging or injection opening degradation side effects. The injector number irradiation is performed for engine driving acceptable tip temperature (eg. 170 DegC) engine temperature does not exceed the set number etc. required to seal. In particular, double injection engine (PDI) GDI engine head toward the member side and a GDI injection and burning of a condition, this may adversely affect the GDI injector tip temperature be. I.e., if the jet of GDI, injector fuel combustors overheat prevention effect is spirally through the injector tip but, PDI PFI engine when burning mode, it is thermal energy combustion fuel injector internal circulating in free relationship 200deg.c.. The double injection (PDI) PFI engine embodiment is injection time which increases engine performance and emission gas damaging GDI injector location other. the present invention according to the one aspect, in order to solve the aforementioned door number point loose number is provided, the purpose of the invention relates to a dual injection engine of gasoline direct injector cooling welding (GDI injector), based on the same fuel injector of the engine overheating when administration of solution by a double jet number apriori disclosed. The technical objectives of this invention is descriptive and not referred to one or more pipeline number number number are not specific in yet a further technique is provided to clearly understand the present invention from the substrate to below may be in person with skill in the art are disclosed. It became a number on number and in order to achieve, is one aspect of the present invention injector tip block chamber is separated from said injector tip comprising said number 1 number 2 injector number 1 width and depth is not exposed into the combustion chamber by adjusting the ratio said number 2 spray injector for injecting fuel into a dual injection engine width and depth is applied, said number 1 for fuel injection number in the injector injector tip protection method, Injector tip of said number 1 injector tip temperature predicting tip temperature estimating step; Identifying injector drive verification step includes decreasing said number 2 to determine whether the injection; and Decreasing said number 2 being injection, said injector tip temperature when said number 1 number 1 greater than the threshold value, said number 1 injector injection mode number plower [...] mode number; in at least one step of the method for protecting fuel injection number injector tip comprising a number can be [...]. In the embodiment is the method for protecting fuel injection number according to said injector tip after said injection [...] number, said number 1 hereinafter said injector tip temperature threshold when said number 1 flows, said number 2 injector injection number plower returns can be configured to contain a mode return number [e phase. In this case, said injector tip temperature rating threshold number [...] said number 1 number 2 hereinafter said return mode when said number 1 flows under [e returns said number 2 injector injection number can be configured. In the embodiment according to said tip temperature estimating step, decreasing said number 1 to decide whether injection injector can be configured to predict the temperature tip said continuously said number 1. In the embodiment according to said tip temperature estimating step, according to an experiment modelling of the injector can be configured to predict the temperature tip through said number 1. In the embodiment according to said tip temperature estimating step, said injector tip said number 1 receives the temperature effect factor for calculating static tip temperature, said temperature change by correcting said injector tip of said number 1 static tip of dynamic state temperature can be configured to predict the temperature tip. Wherein said influence factor is engine rpm, fuel injection amount, air-fuel ratio, combustion flow, comprising at least one ignition efficiency can, tip of said temperature engine rpm and fuel injection amount be determined to static, the air-fuel ratio correction value and the ignition efficiency and combustion air-fuel ratio and combustion flow taking into account the flow rate considering ignition angle correction value is calculated corrected can be configured. The tip of the injector fuel injection when said temperature and said number 1 injector tip of said number 1 static temperature in the absence of a temperature can be selected in the tip of the fuel injection. In addition, another aspect of the present invention for carrying out the same purposes as above, injector tip block chamber is separated from the injector number 1; Said injector tip injector number 2 does not have to be into the combustion chamber; and Adjusting the ratio to said number 2 fuel injection spray injector width and depth is said number 1 registered number, said number 1 injector tip temperature predicting injector tip, an area in which the decreasing said number 2 to determine whether the injection, said number 2 and decreasing injection mode, said number 1 injector when said tip temperature is greater than the threshold value, said number 1 injector injection mode number plower number control unit; comprising at least one injector tip protection device for a fuel injection number is the number can be [...]. In the embodiment according to the GDI injector injector and said number 1, it will be an injector PFI injector be said number 2. There behind said number the fisherman said number 1 injector injection mode number, said number 1 hereinafter said injector tip temperature threshold when said number 1 flows, said number 2 injector injection under [e returns number can be configured. In addition, control section is incubated with a test value based on said number through modeling said number 1 injector tip can be configured to predict the temperature. On the other hand, by another aspect of the present invention to the aforementioned injector tip protection device for fuel injection number have the same for injecting fuel into a multi-injection engine can be applied to a plurality of injector installed. Another aspect of the present invention for the case that the fresh food compartment, said injector tip chamber is separated from the injector tip block in injector tip temperature prediction method, Said tip of said injector tip receives the temperature effect factor for calculating static temperature, said tip of said injector tip of said dynamic state temperature by correcting the static temperature change number [...] injector tip tip temperature prediction method to predict the temperature tip can be. Wherein said influence factor is engine rpm, fuel injection amount, air-fuel ratio, combustion flow, including at least one of ignition efficiency may be disclosed. In the embodiment of the present invention than when the number as one embodiment according to the injector cooling [...], injector tip is exposed to the interior cylinder alone is vulnerable to overcome disadvantages of double injection engine combustion temperature rise in the PFI injector can be. The injector according to the embodiment number [...] when cooling in the embodiment, the GDI injector PFI embodiment long combustion mode where occurrence of thermal stress due to temperature can be billion number exceeds allowable limits, injector tip can prevent mechanical damage. In addition, soot is accumulated in a hot injector tip clogging due to the combustion and exhaust gas injector hole injection (Soot) price performance deterioration can number billion. In addition to cooling without mechanism design in order to meet the diameter of the number only number to overcome the shortcomings of the low cost of the article itself is optimal solution entrained in a dual injection engine can be disclosed. In addition, the effect of the invention in accordance with the effects in the embodiment is a cured resin can be mentioned, such effect can be clearly identified in the description of subjected to carry in the embodiment. In the embodiment of the present invention are appended to the specification the next drawing one example in which a, further understanding of the present invention with the aforementioned detailed description of the invention feature which serves three, are not described in the present invention refers to such drawing like a is confined only to the interpreted. In the embodiment according to Figure 1 of the present invention application of the object to determine the number one fuel injection method exhibits dual injection engine. In the embodiment according to the method of the present invention Figure 2 shows a fuel injection number block representing one also are disclosed. Figure 3 shows a method of the present invention one or more teeth in the embodiment according to the number of words to explain the order also fuel injection number are disclosed. In the embodiment of Figure 4 shows a GDI injector tip also exhibits the tip it comes modeling. In the embodiment of Figure 5 shows a injector tip also exhibits the tip it comes modeling. Figure 6 shows a static injector tip in the embodiment of the tip it comes modeling also exhibits. Hereinafter, in the embodiment of the present invention through a one exemplary drawing detailed as follows. Each of the drawings in adding references components, although other drawing even for the same components displayed on a possible code accomplishing the same may have a significantly negative. In addition, the present invention is connected to the described, publicly known or a function of the associated specific description the subject matter of invention description if a haze can be decided to be dispensed to each other. In addition, the descriptions or size of the components are shown in the drawing a shape or the like can be illustrated [...] intelligibility and exaggerated. In addition, the structure and operation of the invention specifically defined taking into account the terms of the present invention in the embodiment to account for the hell of and, or limit the scope of the present invention is endured. In the embodiment according to Figure 1 of the present invention application of the object to determine the number one fuel injection method exhibits dual injection engine. In the embodiment a dual injection engine (100) is also such as violations of the number 1 engine (110), air intake pressure sensor (or an intake flow sensor, 140), throttle valve (150), PFI injector (120), GDI injector (130), oxygen sensor (160) and cylinder (170) can be comprising. The engine number violations (110) which means the ECU but, meaning that the engine must not only number plower number anxiety which, in addition to various electrical part number plower number anxiety including general outline both various engine are disclosed. Violations of the number engine (110) to implement the vehicle passenger driving according to performance throttle valve (150) open amount produced from the motor through the air number etched. Engine intake pressure sensor (or an intake flow sensor, 140) introduced an extent number chamber through the initial value, fuel injection amount is determined based on measuring the air. Oxygen sensor signal carried over the chamber number combustion exhaust air-fuel ratio of a difference between the target air-fuel ratio via a closed loop in order to compensate the number (Closed Loop Control) is embodiment with each other. In one aspect [...] number GDI injector (130) of the PFI embodiment cooling mode in spraying the combustion chamber. In the case of fuel injected through an injector alone or GDI PDI mode injection being regulated, corresponding fuel injection number should not overheating is avoided in improving [...] side in terms of design. Violations of the engine number (110) includes a GDI injector tip temperature calculating PFI mode when burning, GDI injector tip temperature critical point or more sustained due to PFI mode reaches a GDI mode number conversion leading steel substrate. The GDI injection mode fuel injector tip due to circulation of super heated steam temperature of GDI injection mode of the swirl pot is used as the flange. GDI separate sensor measuring the temperature of the injector tip to be moved between experimental modeling based on predicting other. GDI injector tip temperature of main factors that used as the static state (Steady State) determines the temperature of the ferroelectric layer, as much as possible a temperature change of the temperature of the injector tip approximate dynamic state (Dynamic State) through filtering calculates a final model for estimating temperature. In the embodiment according to the method of the present invention Figure 2 shows a fuel injection number indicating block for one injector tip protection also are disclosed. In the embodiment according to the method of the present invention injector tip protection for fuel injection number one cylinder the injector tip (170) of chamber is separated from the injector number 1 (130) does not have to be into the combustion chamber on said injector tip injector number 2 (120) wherein said number 1 injector (130) said number 2 on injector (120) for injecting fuel into a spray by adjusting the ratio dual injection engine (100) applied to the, said number 1 injector (130) in the method for protecting fuel injection number of injector tip, Said number 1 injector (130) predict the temperature tip of the tip temperature prediction step (S100) of injector tip; said number 2 injector (120) is to determine whether the injection injector drive verification step includes identifying (S110); and Said number 2 injector (120) and injection mode, said number 1 injector (130) of said tip temperature number 1 if greater than the threshold value, said number 1 injector (130) injection mode (S120) mode number number plower [...]; can be connected to one end. Number 1 injector (130) cylinder (170) direct injection fuel into a combustion chamber of a GDI injector (130) can be a. Injector number 2 (120) such as an intake manifold is installed cylinder (170) direct injection fuel into a combustion chamber of not PFI injector (120) can be a. The injector tip protection GDI injector (130) injector tip from overheating protection means that the can. Specifically described, double injection engine (PDI, 100) and the jet head toward the member and burning of a condition not GDI GDI engine, this GDI injector (130) be tip of temperature may adversely affect the performance. I.e., if the jet of GDI, injector fuel combustors overheat prevention effect is spirally through the injector tip but, PDI PFI engine when burning mode, it is thermal energy combustion fuel injector internal circulating in free relationship 200deg.c.. The double injection (PDI) PFI engine embodiment is injection time increases GDI injector (130) and the temperature of injector tip and damaging, the internal combustion engine performance and emission gas can be location. In order to prevent such phenomenon GDI injector (130) injector tip from overheating protection means that the can. In the embodiment according to the method of the present invention injector tip protection for said injection fuel injection number one after the [...] number, said number 1 injector (130) of said tip temperature hereinafter threshold when said number 1 flows, said number 2 injector (120) returns a injection number can be adapted to contain a mode return number [...] plower (S130). Tip temperature in step (S100), said number 1 injector (130) even when jetting mode continuously said number 1 injector (130) can predict the temperature of said tip. I.e., tip temperature prediction engine number violations (110) and various state is mapped according to the temperature value of the tip, is the construction of the map price can be a fashion. I.e., tip temperature prediction periodically transmit number 1 injector (130) of said tip temperature flows hereinafter threshold when said number 1, number 2 returns to original injector injection can be [...] driving again. In the embodiment according to said number 1 (S130) is the mode return number [...] said injector (130) of said tip temperature rating threshold when said number 1 number 2 hereinafter flows said number 2 injector (120) can be configured to return a injection number under [e. I.e., injector number 2 (120) injection mode number 1 injector (130) reference value (threshold number 1) number 1 and converted into injection injector (130) in injection injector number 2 (120) returns to the injection unit has a reference value (threshold number 2) at a distance from and between engine durability due to mode conversion can be prevented from being lowered. Figure 3 shows a method of the present invention one or more teeth in the embodiment according to the number of words to explain the order also fuel injection number are disclosed. Violations of the engine number (110) includes a GDI injector (130) can be calculated on the basis of modeling tip of temperature (S200). The violations of the engine when the number (110) (S210) whether the PFI injection is activated can be. If the PFI injection is not erased GDI injector tip cooling position completed at a time t5. number words is activated. However PFI injection is activated on the basis of GDI injector tip 1 or more persistent PFI mode the combustion temperature reaches a threshold value confirming whether each of the other (S220) tip. The GDI injector tip temperature reaches 1 or more GDI injector tip cooling number words is not authorized threshold value tip position completed at a time t5. However GDI injector tip tip temperature threshold value is 1 or more GDI injection is activated substrate (S230) when it reaches. I.e., GDI injection mode by activating the injector tip cooling circulating fuel by inducing substrate. By responding to the GDI injector tip temperature continuously calculates a Hsb (S240). The GDI injector tip tip temperature threshold value identifies whether the other (S250) falls into 2 hereinafter. The GDI injector tip tip temperature threshold value but hadn't injector tip temperature calculating reported falls into 2 hereinafter, GDI injector tip tip temperature threshold value PFI (S260) allows drops again return to mode 2 hereinafter. In the embodiment of Figure 4 shows a GDI injector tip also exhibits the tip it comes modeling. In the embodiment according to said tip temperature estimating step (S100) is, through modeling experiment value based on said number 1 injector (130) can be configured to predict the temperature tip of. The reference also 4, exhibits X axis is the engine speed. The engine speed is 1500 rpm in 3000 rpm in a range is also shown. Manifold absolute pressure (MAP) Y axis by a goniophotometer. The manifold absolute pressure is 40 kPa in 80 kPa in a range is also shown. On the other hand, Z shaft exhibits tip of GDI injector tip temperature. For example, 1500 rpm when the engine speed and manifold absolute pressure 40 kPa, the GDI injector tip temperature modeling of Figure 4 GDI injector tip tip 118 °C temperature tip as a predicted substrate. In the embodiment of Figure 5 shows a injector tip also exhibits the tip it comes modeling. In the embodiment according to said tip temperature estimating step (S100) is, first said number 1 injector (130) receives the temperature tip of said impact factor static tip temperature (200a, 200b) (of Figure 5 (2), (4) reference also portion 6) related to HRV, The calculated static tip temperature (200a, 200b) is GDI injector (130) fuel circulation in the event of a static temperature _PDI (200a) on GDI injector (130) when non-circular fuel static temperature _PFI (200b) can be divided into. (1) On (On) state in PFI injection (4) rolling by static temperature _PFI (200b) selects input of. However (1) off in PFI injection (Off state (2) rolling by static temperature _PDI (200a) selects input of. Static tip of selected temperature (200a) injection ratio (210) and fuel injection amount (220) behind an exposure correction value considering injection ratio (of Figure 5 (3) reference portion), the corrected static tip temperature (250) of tip temperature change dynamically correcting back to 2000. I.e., used to determine the dynamic state filtering (of Figure 5 (7) with reference to the course of) said number 1 injector (130) of said tip temperature (260) diffuse to predict. Figure 6 shows a static injector tip in the embodiment of the tip it comes modeling also exhibits. First, said influence factor is engine rpm (310), fuel injection amount (320), air-fuel ratio (330), combustion flow (340, 360), ignition efficiency (350) can be at least one of, said static tip temperature (200a, 200b) engine rpm (310) and fuel injection amount (320) (of Figure 6 (8) reference portion) be determined to, air-fuel ratio (330) and combustion flow (340) and taking into account the air-fuel ratio correction value is corrected (of Figure 6 (9) portion reference), again ignition efficiency (350) and combustion flow (360) by considering the ignition angle correction value is corrected (of Figure 6 (10) portion reference) limited thereto. Static tip of said temperature (250) is said number 1 injector (130) when the tip of the fuel injection temperature (200a) on said number 1 injector (130) in the absence of a fuel injection tip of temperature (200b) can be selected among. Also hereinafter described more specifically with reference to 5 and 6 also in 2000. GDI injector (130) tip temperature modeling tip temperature which affects the temperature variation factor calculated based on static, dynamic state temperature current temperature are added together in a manner that model calculates a filtered temperature. First, a 5 also through a browser substrate. (1) The switch portion, PFI injection according selects static temperature input. GDI injector (130) aspect fuel injection is made considerably influences whether 2000 KIPO. The GDI injector (130) through fuel injection when (2), (3) in terms of computation of. GDI or PDI is in spraying mode static temperature (2) is used in, injection ratio (210) and fuel injection amount (220) considering current GDI injector (130) injection ratio correction (3) in combustion chamber. GDI injector (130) by fuel injection-free PFI mode static temperature (4) groove portion, (2) 70 is composed of a portion identical to the algorithm. (2) And (4) in the case of portion, by the same input factor calculation embodiment however, fuel circulation according to temperature is used to seal a digital state number other remained to be coated. To reflect the same (2) and (4) other experimental law number each engine (110) calculates the data to data. (5) The switch portion, calculates the difference between current engine fuel selects input. At the time of engine fuel cut without burning has an introduced into exhaust gas discharged into the intake, the intake by cooling combustion chamber. The in this case the (6) portion such as engine rpm (230), engine cooling water temperature (240) through the cylindrical electrode data based on static temperature (250) to determine the. (7) In the groove portion, the tip of the aforementioned static calculated as temperature (250) to current tip temperature estimation for filtering used for dynamic state a glycidyl group, engine driving condition which approximates the temperature tip of a seal number selecting filter constants according to ultimate tip temperature (260) related to HRV. On the other hand, of Figure 5 (2) and (4) details of algorithm is detailed static temperature of cytosolic phospholipase a2. also 6. The reference also 6, injector tip temperature does not absolute engine exhaust it comes engine rpm (310) and fuel injection amount (320) based on driving areas, air-fuel ratio (330) and combustion flow (340) based on the air-fuel ratio correction value, ignition efficiency (350) and combustion flow (360) affected by variations in ignition angle based on subjected. Essentially the engine rpm (310) and fuel injection amount (320) by, static operation current operating zone reaches the temperature of equilibrium is determined experimentally determined (8) store portion. The map air-fuel ratio value (330) on combustion flow (340) by the air-fuel ratio correction value (9) and the ignition efficiency (350) and combustion flow (360) by ignition angle correction value (10) a particular static tip temperature (200a, 200b) related to HRV. In addition, in the embodiment according to the device of the present invention is cylinder number one injector tip protection for fuel injection injector tip (170) of chamber is separated from the injector number 1 (130); Injector tip does not have to be into the combustion chamber said injector number 2 (120); and Said number 1 injector (130) said number 2 on injector (120) to a fuel injection rate spray registered number, said number 1 injector (130) predicting the temperature of injector tip tip, said number 2 injector (120) is an area in which to determine whether the injection, said number 2 injector (120) and injection mode, said number 1 injector (130) of said tip temperature threshold value or more, said number 1 injector (130) injection mode number plower number control unit; comprising at least one can be. In the embodiment according to said number 1 injector (130) includes a GDI injector (130) and, said number 2 injector (120) includes a PFI injector (120) implementation being. Said number the fisherman said number 1 injector (130) there behind injection mode number, said number 1 injector (130) of said tip temperature hereinafter threshold when said number 1 flows, said number 2 injector (120) can be configured to return a injection number under [e. In addition, control section is incubated with a test value based on said number through modeling said number 1 injector (130) can be configured to predict the temperature tip of. In the embodiment according to the device of the present invention wherein one injector tip protection for fuel injection number have the same for injecting fuel into a multi-injection engine can be applied to a plurality of injector installed. With, in the embodiment according to the injector tip of the present invention injector tip tip temperature prediction method one cylinder (170) of said injector tip tip temperature prediction method in chamber is separated from the injector, Said tip of said injector tip receives the temperature effect factor for calculating static temperature, said tip of said injector tip of said dynamic state temperature by correcting the static temperature change can be configured to predict the temperature tip. In the embodiment according to the influence factor is engine rpm, fuel injection amount, air-fuel ratio, combustion flow, including at least one of ignition efficiency may be disclosed. A feature of the present invention sends more description is provided to exemplify the generally described, the present invention if the properties of the present invention is provided to essentially inputted from deviating from a person with skill in the art in various modifications and deformable disclosed. The present invention in the embodiment of the present invention is to define the disclosure but rather to explain the feature and, in the embodiment of the present invention by not the limited range of such feature. Under the protection range of the present invention must be interpreted by fee so as to range, and the range of the present invention feature in a range equal to all rights should interpreted. 100: Double injection engine 110: Violations of the number engine 120: PFI injector, injector number 2 130: GDI injector, injector number 1 140: Air intake pressure sensor 150: Throttle valve 160: Oxygen sensor 170: Cylinder 200A, 200b: static tip temperature 210: Injection ratio 220, 320: Fuel injection amount 230, 310: Engine rpm 240: Nitride 250: Corrected static temperature 260: Buffered tip temperature [...] dynamic state 330: Air-fuel ratio 340, 360: Combustion flow 350: Ignition efficiency One aspect of the present invention, a fuel injection control method for protecting an injector tip of an injector, and a control device therefor. More specifically, according to a dual injection engine switching an injection mode between a port fuel injection (PFI) type injector and a gasoline direction injection (GDI) type injector, the present invention prevents an injector tip of a GDI injector from being overheated. According to one embodiment of the present invention, the injector tip is exposed to the inside of a cylinder in a case of injector cooling control in order to overcome disadvantages of the dual injection engine vulnerable to an increase in the injector temperature in a case of PFI single combustion. COPYRIGHT KIPO 2017 Injector tip block chamber is separated from said injector tip comprising said number 1 number 2 injector number 1 width and depth is not exposed into the combustion chamber by adjusting the ratio said number 2 spray injector for injecting fuel into a dual injection engine width and depth is applied, the method for protecting fuel injection number in said number 1 injector injector tip, the tip of the injector tip temperature prediction for predicting said number 1 injector tip temperature; decreasing said number 2 to determine whether the injection injector drive verification step includes identifying; and said number 2 and decreasing injection mode, said injector tip temperature when said number 1 number 1 greater than the threshold value, said number 1 injector injection mode number number [...] plower mode; the method including injector tip protection for a fuel injection number. According to Claim 1, after said injection [...] number, said number 1 hereinafter said injector tip temperature threshold when said number 1 flows, said number 2 injector injection number [e phase including an injector tip protection mode return number returns plower characterized the method for fuel injection number. According to Claim 2, said injector tip temperature rating threshold number [...] said number 1 number 2 hereinafter said return mode when said number 1 flows said number 2 injector injection injector tip protection for fuel injection number number characterized plower returns to method. According to Claim 1, said tip temperature estimating step, said injector tip temperature decreasing said number 1 to decide whether injection continuously said number 1 characterized in that the fuel injection number method for predicting injector tip protection. According to Claim 1, said tip temperature estimating step, experimental value based on said number 1 through modeling injector tip temperature predicting method characterized the injector tip protection for fuel injection number. According to Claim 1, said tip temperature estimating step, said injector tip said number 1 receives the temperature effect factor for calculating static tip temperature, said tip of said injector tip of said number 1 dynamic state temperature change by correcting the static temperature tip injector tip protection method characterized for predicting the fuel injection number. According to Claim 6, said influence factor is engine rpm, fuel injection amount, air-fuel ratio, combustion flow, including at least one of ignition efficiency characterized the injector tip protection for fuel injection number method. According to Claim 6, engine rpm and fuel injection amount be determined to static said tip of temperature, air-fuel ratio correction value and the ignition efficiency and combustion air-fuel ratio and combustion flow considering flow considering ignition angle correction value is calculated so as to compensate for injector tip protection method is characterized for fuel injection number. According to Claim 6, the tip of the injector fuel injection when said number 1 static said temperature temperature combination for the tip of tip of at least one selected from an injector tip temperature characterized the method for protecting fuel injection number. Chamber is separated from the injector tip block number 1 injector; said injector tip injector number 2 does not have to be into the combustion chamber; and adjusting the ratio to said number 1 fuel injection spray injector said number 2 width and depth is registered number, said number 1 injector injector tip tip temperature predicting, an area in which the decreasing said number 2 to determine whether the injection, said number 2 and decreasing injection mode, said number 1 injector when said tip temperature is greater than the threshold value, said number 1 injector injection mode number plower number control unit; a fuel injection number including injector tip protection for the device. According to Claim 10, GDI injector injector and said number 1, said number 2 it is an injector for fuel injection number PFI injector injector tip protection device is characterized. According to Claim 10, said number the fisherman said number 1 injector injection mode there behind number, said number 1 hereinafter said injector tip temperature threshold when said number 1 flows, said number 2 injector injection injector tip protection for fuel injection number characterized plower number returns to the device. According to Claim 10, injector tip temperature control section is incubated with a test value based on said number through modeling said number 1 characterized injector tip protection device for predicting the fuel injection number. According to Claim 10, said fuel injection device for injecting fuel into a multi-injection engine installed have the same number is applied to a plurality of injector injector tip protection device is characterized in that for fuel injection number. Injector tip chamber is separated from the injector tip tip temperature prediction method block in said injector, said injector tip of said tip static receives the temperature effect factor for calculating temperature, the temperature change by correcting said injector tip of said tip of said static dynamic state temperature injector tip tip temperature prediction method predict the temperature tip. According to Claim 15, said influence factor is engine rpm, fuel injection amount, air-fuel ratio, combustion flow, including at least one injector tip tip temperature prediction method characterized ignition efficiency.
