Motor torque compensation coordination method for hybrid vehicles based on engine dynamic characteristics identification

Abstract

The invention discloses a hybrid vehicle motor torque compensation coordinating method based on engine dynamic characteristic recognition. A control method for engine dynamic responding performance recognition, responding torque estimation and motor synchronous compensation is provided in order to solve the problems that, for instance, variations of states of two power sources and a clutch easilycause impact during mode switching of a parallel hybrid vehicle, a real engine has many influencing factors for dynamic response, continuously varying response characteristics and obvious lag and error, differences in message periods of sub-controllers easily cause relative time delay of communications, and the sub-controllers provide lagged control. In dynamic conditions such as quick acceleration, dynamic response characteristics of an engine are recognized via its actual response data, future response is estimated, total torque response error of the engine during operating can be effectively decreased via motor synchronous compensation, and vehicle dynamic properties are improved at the premise of ensuring smoothness and comfort.

Description

technical field [0001] The invention belongs to the technical field of parallel hybrid electric vehicles, in particular to a motor torque compensation coordination method for hybrid electric vehicles based on identification of engine dynamic characteristics. Background technique [0002] With the increasingly severe energy and environmental issues, energy-saving and new energy vehicle technologies have become hot spots. Due to its good economy and long driving range, hybrid electric vehicles have become one of the key research directions. Among them, the parallel hybrid model has a simpler structure and is easier to control than the hybrid configuration, has more drive modes than the series configuration, can adapt to various working conditions, has no secondary conversion of energy, and has higher efficiency. Multiple development applications. [0003] When the parallel hybrid vehicle is driven purely at low speed, it can take advantage of the low-speed and high-torque ch...

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Problems solved by technology

However, the above method requires a large amount of experimental data, the program is complex, and the amount of calculation is large, so it is difficult to realize the actual vehicle application.

[0006] In addition, the above methods do not take into account that when the message periods of the sub-controllers of the power source on the real vehicle are different, the communication between the HCU and each sub-controller is relatively lagging, which causes the motor torque compensation to be untimely and inaccurate, resulting in a shift in total demand. moment can not get a good response

[0007] In view of the above-mentioned technical deficiencies, the motor torque compensation coordination method for hybrid vehicles based on engine dynamic characteristics identification described in the present invention is aimed at the change of power source and clutch working state that is likely to cause impact when the driving mode of parallel hybrid vehicles is switched, and the actual vehicle engine dynamics There are many factors affecting the response, the dynamic characteristics are constantly changing, the response lag and error are obvious, and the message cycle of each sub-controller is different, which will easily lead to problems such as communication delay and control lag. The engine dynamic response performance identification, response torque estimation, and motor synchronization are proposed. compensation control method

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