An active front wheel steering control method for electric vehicles with automatically adjustable control parameters

An active front wheel steering and automatic adjustment technology, which is applied to steering mechanisms, vehicle components, transportation and packaging, etc., can solve the problems of direct yaw moment control that is difficult to achieve control effects, controller discontinuity, system crashes, etc., to achieve Effects of reducing traffic accidents, reducing buffeting problems, and reducing costs

CN109850015BActive Publication Date: 2021-08-03JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-08-03

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Abstract

The invention discloses an active front wheel steering control method of an electric vehicle whose control parameters can be automatically adjusted, and belongs to the field of new energy electric vehicle control. The control method can improve the stability of the vehicle under extreme working conditions. The main steps are: 1. Establish a linear two-degree-of-freedom vehicle dynamics model, calculate the ideal yaw rate of the vehicle through the model, and design an active front wheel steering control module for electric vehicles based on discontinuous control technology; 2. Establish an observer module to estimate Control the average value of the input medium and high frequency signals; 3. Establish an adaptive module to construct a time-varying control gain according to the average value. The advantages of the present invention are as follows: firstly, the vehicle can respond quickly and automatically in extreme environments, improve the accuracy of the active front wheel steering system, and reduce the occurrence of traffic accidents; secondly, the control in the traditional terminal sliding mode method is significantly reduced The gain reduces potential chattering problems; thirdly, the control method has a simple structure, a small amount of computation, and is easy to implement.
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Description

technical field

[0001] The invention relates to a control strategy for active front wheel steering of an electric vehicle, and belongs to the field of new energy electric vehicle control. Background technique

[0002] Compared with traditional cars, hub-type electric vehicles simplify the chassis structure, omit most of the traditional components, improve the transmission efficiency, and the driving or braking force of the four wheels is independently controllable.

[0003] Active front wheel steering means that within the linear range of the lateral force of the vehicle tires, an additional angle of rotation is applied to the front wheels through the actuator, which does not depend on the input of the steering wheel, corrects the steering angle of the car, improves the steering accuracy, and realizes active steering. . Active front wheel steering is a steering system between traditional power steering and steer-by-wire. It not only has the structural foundation of mechanic...

Examples

Embodiment Construction

[0061] The invention provides an active front wheel steering control strategy of an electric vehicle whose control parameters can be automatically adjusted. In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0062] figure 1 Shown is a schematic diagram of the system relationship of the present invention, which includes 1. a linear two-degree-of-freedom vehicle model, 2. Carsim software (whole vehicle model), 3. an observer module, 4. an adaptive module, and 5. a discontinuous control module.

[0063] Based on the above-mentioned system, explain the present invention to the vehicle stability control method under complex working conditions by concre...