A method for controlling hydraulic pressure preset performance of an electric master cylinder of a vehicle brake-by-wire system

A technology of brake-by-wire and preset performance, which is applied in the direction of brake transmissions, brakes, vehicle components, etc., and can solve the problems of increased design difficulty, failure to maintain, master cylinder pushrod displacement, master cylinder hydraulic pressure cannot be preset, etc. problems, to achieve the effect of improving practicability and robustness

A technology of brake-by-wire and preset performance, which is applied in the direction of brake transmissions, brakes, vehicle components, etc., and can solve the problems of increased design difficulty, failure to maintain, master cylinder pushrod displacement, master cylinder hydraulic pressure cannot be preset, etc. problems, to achieve the effect of improving practicability and robustness

CN112622857BActive Publication Date: 2022-04-15TSINGHUA UNIV
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  • A method for controlling hydraulic pressure preset performance of an electric master cylinder of a vehicle brake-by-wire system
  • A method for controlling hydraulic pressure preset performance of an electric master cylinder of a vehicle brake-by-wire system
  • A method for controlling hydraulic pressure preset performance of an electric master cylinder of a vehicle brake-by-wire system

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Embodiment Construction

[0089] The present invention proposes a hydraulic pressure preset performance control method of an electric master cylinder of a brake-by-wire system for a vehicle, which will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0090] The present invention proposes a method for controlling the hydraulic pressure preset performance of the electric master cylinder of the vehicle brake-by-wire system. The overall process is as follows: figure 1 shown, including the following steps:

[0091] 1) Construct a control-oriented motor-assisted brake-by-wire system master cylinder hydraulic pressure dynamics model;

[0092] The structure of the motor-assisted brake-by-wire system is as follows: figure 2 As shown in the figure, Motor represents the booster motor, Gear represents the reduction mechanism, Ball-screw represents the push rod mechanism, and Master Cylinder represents the master cylinder. Depend on figure 1 It can b...

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Abstract

The invention provides a method for controlling the hydraulic pressure preset performance of an electric master cylinder of a vehicle brake-by-wire system, which belongs to the field of vehicle brake-by-wire. This method is firstly based on the dynamic modeling of the booster motor, drive shaft and master cylinder to obtain a control-oriented hydraulic dynamics model of the master cylinder of the motor-assisted brake-by-wire system, and then design a suitable preset performance function and predict the system. Assuming that the performance changes, the finite-time terminal sliding mode control is performed on the changed system through the neural network adaptive nonlinear estimation method. Starting from the preset performance, the present invention designs a control method that meets the performance requirements, so as to realize the precise control of the preset master cylinder push rod displacement and hydraulic pressure transient and steady-state response.

Description

technical field [0001] The invention provides a method for controlling the hydraulic pressure preset performance of an electric master cylinder of a brake-by-wire system for a vehicle, and relates to the field of vehicle brake-by-wire. Background technique [0002] The brake-by-wire system is the basis and premise for electric vehicles to achieve braking energy recovery and intelligent vehicles to achieve active braking. It plays a vital role in the realization of high-level driverless technology. The brake-by-wire system can directly control the brake system to achieve active braking by responding to the brake signal of the vehicle central controller. The whole braking process does not require the driver to participate in braking by stepping on the brake pedal. It can be seen that one of the basic requirements of the brake-by-wire system is the complete decoupling of the brake pedal stroke and the braking force. Based on this condition, a vehicle equipped with a brake-by-w...

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Application Information

Patent Timeline
15 Apr 2022
Publication
CN112622857B
IPC
B60T13/74; G06F30/17
CPC
B60T13/745; G06F30/17; G06F2119/14
Inventors
季园; 何承坤