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Steer-by-wire system and stability control method thereof

A technology of steer-by-wire and steering wheel, which is applied in the direction of automatic steering control components, steering mechanisms, steering rods, etc., which can solve problems such as the influence of vehicle driving stability, improve handling stability and active safety, improve overall performance, The effect of good performance robustness and robust stability

Active Publication Date: 2017-12-26
NANJING AUTOMOBILE GROUP CORP
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Problems solved by technology

[0007] On the other hand, the car often encounters various unexpected situations during driving, such as changes in the adhesion coefficient of the road surface, side wind interference, etc. These external disturbances will have a huge impact on the driving stability of the car, and drivers generally cannot Make timely and accurate corrections to this

Method used

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  • Steer-by-wire system and stability control method thereof
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  • Steer-by-wire system and stability control method thereof

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Embodiment Construction

[0046] Specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0047] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0048] A steer-by-wire system such as figure 1 As shown, it includes three major modules: steering wheel module, front wheel steering module and ECU electronic control unit 4. Wherein, the ECU electronic control unit 4 includes a variable transmission ratio controller 18 , a fuzzy adaptive PID controller 19 and a full state feedback controller 25 .

[0049] The steering wheel module includes a steering wheel, a steering column, a road sensor motor and a steering wheel angle ...

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Abstract

The invention provides a steer-by-wire system and a stability control method thereof. The steer-by-wire system comprises a steering wheel module, a front wheel steering module and an ECU electronic control unit, wherein the ECU electronic control unit comprises a variable transmission ratio controller, a fuzzy self-adaptive PID controller and a full state feedback controller. The stability control method is as follows: the variable transmission ratio controller calculates an ideal transmission ratio at the moment according to a steering wheel rotation angle signal and a vehicle speed signal, to obtain an ideal front wheel rotation angle at the moment; the full state feedback controller of an automobile calculates a compensation rotation angle of front wheels according to a yaw rate signal and a lateral acceleration signal of the automobile, to realize the outer ring control of the steer-by-wire system; and finally the fuzzy self-adaptive PID controller is designed, to realize the inner ring control of the steer-by-wire system. The operating stability of the automobile is effectively improved through the coordinated control of inner and outer rings of the steer-by-wire system.

Description

Technical field: [0001] The invention relates to a steer-by-wire system and a stability control method thereof, capable of light steering at low speeds and stable steering at high speeds, belonging to the field of steer-by-wire systems for automobiles. Background technique: [0002] Steering system is one of the three key core components of a car, and its performance directly determines the driver's steering feel and the active safety of the car. At this stage, the transmission ratio of the electronically controlled hydraulic power steering system and the electric power steering (EPS) system is fixed. Although it can realize the coordination and unity of light steering and road feeling, its steering flexibility and active safety are insufficient, that is, it cannot be used for automobiles. Freely adjust the transmission ratio of the steering system in various situations encountered during driving, use different control strategies to achieve precise control of the front wheel...

Claims

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Application Information

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IPC IPC(8): B62D5/04B62D6/00B62D101/00B62D103/00B62D113/00B62D137/00
Inventor 周栋钟国华戴能红孔繁尘侍萧王宁海
Owner NANJING AUTOMOBILE GROUP CORP
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