Hydraulic system for providing auxiliary drive to a powertrain and a hydraulic circuit
This disclosure is directed towards a hydraulic system for providing auxiliary drive to a powertrain (11) and a hydraulic circuit (12) by storing and releasing hydraulic fluid using an accumulator (29). A hydraulic drive system (10) comprises an engine (14), a hydraulic machine (22) operably connected to the engine (14), a pump (17), an accumulator (29) and at least one valve (20, 27). The pump (17) is driven by the engine (14) and is configured to control a hydraulic circuit (12). The accumulator (29) is fluidly connected to the hydraulic circuit (21) and the hydraulic machine (22). In one instance, the at least one valve (20, 27) is operable to direct pressurised fluid from at least one of the hydraulic machine (22) and the pump (17) to charge the accumulator (29). Alternatively, the at least one valve (20, 27) is operable to direct pressurised fluid from the accumulator (29) to at least one of the hydraulic machine (22) and the hydraulic circuit (21). 1. A hydraulic drive system (10), including: Engine (14); Operably connected to the engine (14) of the hydraulic device (22); By the engine (14) drive and constructed to control the hydraulic circuit (12) of the pump (17); Fluidly connected to the hydraulic circuit (12) and the hydraulic device (22) of the accumulator (29); and At least one valve (27, 20), which can be operated in order to guide from the hydraulic device (22) and the pump (17) in at least one of the pressurized fluid in order to fill the accumulator, or the pressurized fluid from the accumulator (29) leading to the hydraulic device (22) and the hydraulic circuit (12) in at least one of; Wherein the hydraulic device (22) is configured to the pressurized fluid from the accumulator (29) leading to the hydraulic device (22), the supplementary power supply to the engine (14). 2. The hydraulic drive system (10) according to Claim 1, characterized in that said hydraulic device (22) by the drive shaft is operatively connected to the engine (14). 3. The hydraulic drive system (10) as in Claim 1 or Claim 2, characterized in that said hydraulic device (22) is a motor, from the accumulator (29) the release of the pressurized fluid to drive the motor in order to will be supplementary to drive the power supply to the engine (14). 4. The hydraulic drive system (10) as in Claim 1 or Claim 2, characterized in that said hydraulic device (22) is connected to the hydraulic fluid source is and pump of the engine (14) driving is used for filling the accumulator (29). 5. The hydraulic drive system (10) as in Claim 1 or Claim 2, characterized in that said hydraulic device (22) is reversible. 6. The hydraulic drive system (10) according to Claim 5, characterized in that The reversible hydraulic device is used for in the filling mode the hydraulic fluid pump to the accumulator (29); and The reversible hydraulic device is used for in the drive mode, when the hydraulic fluid from the accumulator (29) is released to drive the engine (14). 7. The hydraulic drive system (10) as in Claim 5 or Claim 6, characterized in that said reversible hydraulic device is a variable displacement pump. 8. According to aforesaid claim any one of the hydraulic drive system (10), characterized in that the accumulator (29) through the hydraulic circuit (12) of the pump (17) by the action of filling. 9. According to aforesaid claim any one of the hydraulic drive system (10), characterized in that the pump (17) is operatively connected to the engine (14) of the output shaft. 10. According to aforesaid claim any one of the hydraulic drive system (10), characterized in that said transmission device (16) driving a transmission system (15). 11. The hydraulic drive system (10) according to Claim 10, characterized in that the power of the torque converter is transmitted to said transmission device (16), said transmission device (16), the pump (17) and the torque converter can be operated so that only the pump (17) by the engine (14) driving, only the transmission system (15) is the motor (14) driving, or states the pump (17) and the powertrain (15) are both the engine (14) drive. 12. An operation of the hydraulic drive system (10) of the method, said method comprising: Controlling at least one valve (20, 27) to the hydraulic fluid from the hydraulic circuit (12) is guided to the accumulator (29) or the hydraulic fluid from the accumulator (29) leading to the hydraulic circuit (12); Controlling at least one valve (27) to the hydraulic fluid from the hydraulic device (22) leading to the accumulator (29) or the hydraulic fluid from the accumulator (29) leading to the hydraulic device (22); Wherein by the engine (14) driving the pump (17) to guide the hydraulic fluid around the hydraulic circuit (12), said hydraulic device (22) is operatively connected to the engine (14); and By the pressurized fluid from the accumulator (29) leading to the hydraulic device (22) through the hydraulic device (22) will supplement the power supply to the engine (14). 13. Method according to Claim 12, characterized in that the engine (14) that an internal-combustion engine, in the engine (14) is smaller than the output torque of the engine (14) brake specific fuel consumption the most hours of the engine (14) when the output torque, the hydraulic fluid is guided to the accumulator (29). 14. Method as in Claim 12 or Claim 13, characterized in that the engine (14) that an internal-combustion engine, in the engine (14) in close to the maximum engine output torque (14) within a predetermined range of the output torque of the time, the hydraulic fluid is from the accumulator (29) guided in order to drive the hydraulic device (22) or is guided to the hydraulic circuit (12). 15. The method according to Claim 12-14, characterized in that said hydraulic device (22) is a motor.