Distributed drive electric vehicle drive system control method based on failure state

Abstract

The invention relates to a control method for a drive system of a distributed drive electric vehicle based on a failure state. Divided into four categories, design the corresponding failure torque redistribution control strategy for these four types of failure modes, and design the control layer structure of the distributed drive electric vehicle motor in the failure state. The control layer structure includes a linear two-degree-of-freedom model, a speed controller and drive torque controller. The failure classification method proposed by the present invention can consider more failure situations, greatly improving the drivability of the vehicle, and the torque redistribution control strategy designed for the failure mode can ensure the stability and power of the vehicle, and can improve the drivability of the vehicle , verifying the effectiveness of the failure control strategy.

Description

technical field [0001] The invention belongs to the technical field of distributed drive electric vehicle control, and relates to a control method for a drive system of a distributed drive electric vehicle based on a failure state. Background technique [0002] The rapid development of my country's automobile industry has brought great convenience to people's lives. However, the huge number of cars makes the world face the crisis of energy depletion, and new energy vehicles are the key to solving this problem. Pure electric vehicles use batteries as the power source and use electric motors to drive electric vehicles, which has become the main research direction of new energy vehicle technology. Among them, the distributed drive electric vehicle omits a series of components such as the engine, transmission, and differential in the structure, and the available space of the vehicle is increased. At the same time, the response speed of the motor control is improved, and the tim...

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Problems solved by technology

[0004] However, the current patents or products seldom study the influence of the failure of the drive system on the direction of the steering wheel. When the steering wheel, that is, the front axle drive wheel, fails, there is an unexpected difference in the left and right output torque of the steering wheel, which leads to the existence of left and right steering wheels. The rotational speed difference, and the moment of the output torque on the kingpin axis cannot cancel each other out, which affects the automatic return function of the steering system, and then affects the driving direction of the vehicle

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