Torque compensation method and system of hybrid vehicle

Abstract

The invention provides a torque compensation method and system of a hybrid vehicle. The method comprises the following steps: obtaining an engine demand torque and a motor demand torque according to accelerator pedal opening and current vehicle speed of a vehicle at current; detecting an actual output torque of an engine at current; calculating a difference value between the engine demand torque and the actual output torque of the engine, and adjusting the motor demand torque according to the difference value to compensate the engine demand torque. The method provided by the invention uses the characteristics of quick motor response and high torque feedback accuracy to perform real-time compensation to the engine torque, such that the demand torque and the actual torque of the entire vehicle are consistent and the power performance of the entire vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a torque compensation method and system for a hybrid electric vehicle. Background technique [0002] At present, due to a series of reasons such as the increasingly serious environmental problems, the shortage of oil resources, and the bottleneck of battery technology, hybrid vehicles have been recognized and supported by countries all over the world. [0003] At present, in the hybrid electric vehicles equipped with natural gas engines, because the motor torque is not used to provide torque compensation, drivers generally report that the engine response is slow and the output power is insufficient, especially when passing traffic lights at intersections, the driver feels "powerless". The root cause lies in the characteristics of natural gas engines: less ignition points, smaller compression ratio, smaller explosion pressure, lagging turbocharger response; and th...

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Problems solved by technology

The root cause lies in the characteristics of natural gas engines: less ignition points, smaller compression ratio, smaller explosion pressure, lagging turbocharger response; and the current measurement of the actual torque value of the engine is through (ControllerAreaNetwork, controller area network) Feedback is carried out in the form of messages, and the torque of the engine is calibrated according to the fuel injection quantity and torque conversion MAP in the steady state during the bench test. In the dynamic state and the steady state, the fuel injection of the engine is It is not the same, which further reflects that the actual output torque value of the engine is different under static and dynamic conditions. In addition, the air conditioner, the generator driven by the engine itself, the friction torque of the engine, etc. make the torque feedback value of the engine different from the real value. Larger, thus affecting the dynamic performance of the vehicle

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