Torque Distribution Method for Hybrid Electric Vehicle
A technology for hybrid electric vehicles and torque distribution, which is applied in hybrid electric vehicles, motor vehicles, power plants, etc.
Active Publication Date: 2017-12-05
WEICHAI POWER CO LTD
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- Application Information
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Problems solved by technology
Just in order to save fuel consumption, the existing torque distribution strategy is to let the engine work near the optimal fuel consumption curve, or to limit the working area of the engine and limit the working point of the engine to a certain high-efficiency zone
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[0028] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0029] Please refer to figure 1 , figure 1 It is a specific structural schematic diagram of the hybrid electric vehicle power assembly in the present invention.
[0030] The powertrain of a hybrid electric vehicle includes an engine, an automatic clutch, a motor, a mechanical automatic transmission AMT and its control system TCU, and a battery that supplies power to the motor and its control system BMS. In the figure, ECU is the engine control unit, MCU is the control system of the motor, and CAN1 and CAN2 are buses for transmitting signals.
[0031] Hybrid vehicles mainly consist of the following power modes:
[0032] Pure electric mode, that is, only the battery provides driving power, which is generally used when st...
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The invention discloses a torque distribution method of a hybrid electric vehicle. The torque distribution method comprises the following steps that vehicle driving torque is determined according to the vehicle driving demand in a hybrid power mode; a plurality of set torque distribution values of an engine are obtained according to the vehicle driving torque; the equivalent fuel consumption rates of the engine and a motor are obtained according to the set torque distribution values; the effective fuel consumption rate corresponding to the vehicle driving torque only provided by the engine, of the engine is obtained when the torque is not distributed; the equivalent fuel consumption rate is compared with the effective fuel consumption rate of the engine, the corresponding set torque distribution value is a favorable torque distribution value and torque distribution is performed according to the favorable torque distribution value if the equivalent fuel consumption rate is lower; the corresponding set torque distribution value is an unfavorable torque distribution value and torque distribution is not performed if the effective fuel consumption rate is lower. According to the scheme, the equivalent fuel consumption rate of a whole power assembly serves as a reference so as to obtain the favorable torque distribution value for torque distribution implementation and enable the vehicle to be always operated at a lowest energy consumption point, and the economical efficiency of the whole vehicle is improved.
Description
technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a torque distribution method for hybrid electric vehicles. Background technique [0002] Hybrid electric vehicle has become one of the models with the most market potential to solve environmental pollution and energy shortage. [0003] The working modes of the hybrid electric vehicle include: pure electric mode, only the motor provides driving force; combined driving mode, the engine and the motor jointly provide driving force; pure engine mode, only the engine provides driving force. [0004] Hybrid vehicles can save fuel consumption by rationally using the motor to provide driving force. According to this, the control unit of the current hybrid vehicle has a built-in torque distribution strategy, which can reasonably allocate the engine without changing the torque demand. and the torque of the motor to optimize the efficiency of the powertrain. According to t...
Claims
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IPC IPC(8): B60W20/10B60W10/08B60W10/06B60K6/44
CPCB60K6/44B60W10/06B60W10/08B60W20/10B60W2710/0666B60W2710/083Y02T10/62
Inventor 张龙聪周之光王海龙乔运乾吕昌国
Owner WEICHAI POWER CO LTD