METHOD AND APPARATUS FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE WHEN A MISFIRE IS DETECTED

An engine-generator comprises: a generator an internal combustion engine coupled to the generator such that operation of the internal combustion engine will generate electricity via the generator and a control system incorporating a misfire detection system the misfire detection system being arranged to monitor engine rotation speed in order to detect a misfire event during operation of the engine wherein in response to an indication of the misfire event the control system initiates a safety mode of the engine-generator. 1. An engine-generator comprising:a generator,an internal combustion engine coupled to the generator such that operation of the internal combustion engine will generate electricity via the generator, anda control system incorporating a misfire detection system, the misfire detection system being arranged to monitor engine rotation speed in order to detect a misfire event during operation of the engine;wherein in response to an indication of the misfire event the control system initiates a safety mode of the engine-generator.2. An engine-generator as claimed in claim 1 , wherein the engine-generator comprises a spark ignition engine using an air-fuel mixture with a lambda value of 1.5 or below.3. An engine-generator as claimed in claim 1 , wherein the safety mode includes cut-off of the fuel supply to the engine.4. An engine-generator as claimed in claim 3 , wherein the safety mode includes continuing engine rotation after cut-off of the fuel supply in order to expel uncombusted fuel to the atmosphere.5. An engine-generator as claimed in claim 1 , wherein the misfire event comprises a number of potential misfires exceeding a maximum permitted number claim 1 , the potential misfires being determined based on the measurement of a rotational speed of the engine.6. An engine-generator as claimed in claim 5 , wherein the misfire detection system is arranged to indicate a misfire event if the number of ignition strokes with potential misfires exceeds 8% of ...

Starter for a combined heat and power unit

A starter system for start up of a combined heat and power unit comprising a generator which is connectable to the grid. The starter system comprises a variable frequency drive, VFD, operable to receive power from the grid. The VFD reduces the frequency of the power, and provides the reduced-frequency power to the generator to start the generator. The starter system further comprises a bypass relay configured to bypass the VFD. The bypass relay allows direct connection between the grid and the generator after the generator has started. The variable frequency drive is configured to operate temporarily during start up of the combined heat and power unit.

Flue gas heat exchanger and fin therefor

Disclosed is a heat exchanger including a plurality of fins, each having a first aperture and a second aperture. A first aperture of a downstream one of the plurality of fins decreases relative to a first aperture of an upstream one of the plurality of fins. A first fluid from the first aperture of the upstream one of the plurality of fins is received partially in the first aperture of the downstream one of the plurality of fins and the remainder of the first fluid is diverted along the downstream one of the plurality of fins and received in the second aperture of the downstream one of the plurality of fins. An inner jacket contacts each of the plurality of fins. An outer jacket surrounds the inner jacket defining a chamber for containing a second fluid therein. The first aperture and the second aperture each define sectors of a circle extending from a central part to an outer periphery for conducting the first fluid toward the inner jacket. The inner jacket is configured to transfer heat ...

STARTER FOR A COMBINED HEAT AND POWER UNIT

A starter system for start up of a combined heat and power unit comprising a generator which is connectable to the grid. The starter system comprises a variable frequency drive, VFD, operable to receive power from the grid. The VFD reduces the frequency of the power, and provides the reduced-frequency power to the generator to start the generator. The starter system further comprises a bypass relay configured to bypass the VFD. The bypass relay allows direct connection between the grid and the generator after the generator has started. The variable frequency drive is configured to operate temporarily during start up of the combined heat and power unit. 2. A starter system according to claim 1 , wherein the starter system comprises heat dissipation devices that would be insufficient for dissipation of heat from the VFD in continuous operation and/or the starter system has electrical shielding that would be inadequate for allowing the VFD to be used in continuous operation.3. A starter system according to any preceding claim claim 1 , wherein the starter system does not include any heat dissipation devices whose purpose is solely to dissipate heat generated by the VFD claim 1 , and/or does not include any electrical shielding whose purpose is solely to shield the starter system from electromagnetic fields generated by the VFD or bypass relay.4. A starter system according to any preceding claim claim 1 , wherein the VFD is operable to initially reduce the frequency of the power received from the grid to an initial value claim 1 , and wherein preferably the initial value is between 2 Hz and 10 Hz.5. A starter system according to claim 4 , wherein the VFD is operable to subsequently increase the frequency of the power provided to the generator claim 4 , preferably from the initial value up to the grid-frequency claim 4 , over a time period which is less than 20 seconds claim 4 , less than 10 seconds claim 4 , less than 5 seconds claim 4 , or less than 2 seconds6. A ...

Starter for a combined heat and power unit

Method and apparatus for controlling an internal combustion engine when a misfire is detected

An engine-generator comprises: a generator 13, an internal combustion engine 14 coupled to the generator 13 such that operation of the internal combustion engine 14 will generate electricity via the generator 13, and a control system incorporating a misfire detection system 5, the misfire detection system 5 being arranged to monitor engine rotation speed in order to detect a misfire event during operation of the engine 1; wherein in response to an indication of the misfire event the control system initiates a safety mode of the engine-generator.

Method and apparatus for controlling an internal combustion engine when a misfire is detected

An engine-generator comprises: a generator 13, an internal combustion engine 14 coupled to the generator 13 such that operation of the internal combustion engine 14 will generate electricity via the generator 13, and a control system incorporating a misfire detection system 5, the misfire detection system 5 being arranged to monitor engine rotation speed in order to detect a misfire event during operation of the engine 1; wherein in response to an indication of the misfire event the control system initiates a safety mode of the engine-generator.

Combined heat and power unit comprising a starter system

Combined heat and power unit comprising a starter system

Flue gas heat exchanger and fin therefor

Flue gas heat exchanger and fin therefor

The invention relates to a heat exchanger for cooling a gas by means of a medium, preferably water. The flue gas exchanger comprises a jacket (3), along which fins (10) provided with inlets and outlets for a flue gas, which is intended to be conducted through the jacket. The jacket (3) consists of an inner jacket (3) and an outer jacket (4), between which a chamber (5) for a cooling medium is formed. The fins (10) are produced individually and assembled into blocks (11) on a central guiding element (13) extending through the jacket (3). The inlets and the outlets preferably consist of sections of a circle, which conduct the flue gas out towards the jacket (3), and which reduce the flow resistance considerably.

Catalytic converter apparatus

A catalytic converter apparatus comprises: a catalytic converter 2; a flow path for directing exhaust gas 10 through the catalytic converter 2; a cavity 20 for housing the catalytic converter 2; and a cooling apparatus for cooling at least a part of an inner surface 28 of the cavity 20; wherein when the catalytic converter 2 is housed within the cavity 20 a gap 26 is formed between the inner surface 28 of the cavity and an outer surface 32 of the catalytic converter 2 with the gap 26 extending around a major portion of the outer surface 32 of the catalytic converter 2.

Asynchronous electrical machine

An asynchronous electrical machine for a combined heat and power device comprises: a first induction element (2), a second induction element (4) and a coil element (3), wherein the first and second induction elements (2,4) and the coil element (3) are mounted along an axis of rotation of the machine and are axially spaced from one another, wherein the machine provides for relative rotational movement between the coil element (3) and the induction elements (2,4) and wherein the coil element (3) is located on the axis between the two induction elements (2,4) and separated from them by axial air gaps.