Hydraulic pressure preset performance control method for electric main cylinder of vehicle brake-by-wire system
A technology of brake-by-wire and preset performance, which is applied in the direction of brake transmission, brakes, vehicle components, etc., and can solve problems such as non-maintenance, increased design difficulty, master cylinder pushrod displacement and master cylinder hydraulic pressure cannot be preset, etc. question
Active Publication Date: 2021-04-09
TSINGHUA UNIV
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Problems solved by technology
[0004] However, since the electronic power-assisted hydraulic brake-by-wire system does not maintain a normal high hydraulic pressure source, when a braking demand is generated, it is necessary to control the power-assisted motor to push the brake fluid of the brake master cylinder to reach the target quickly and accurately from the normal pressure state. pressure, which puts very high demands on the control level of the entire electric master cylinder
The traditional electronic power-assisted wire control hydraulic brake system for vehicles mostly adopts the proportional-integral-derivative method or other robust control methods to control the hydraulic pressure of the master cylinder. The displacement of the push rod of the master cylinder and the hydraulic pressure of the master cylinder cannot be preset. It is necessary to continuously adjust the relevant parameters of the control method to achieve the required performance, resulting in repetitive work and increasing the difficulty of design
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[0090] 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.
[0091] 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:
[0092] 1) Construct a control-oriented motor-assisted brake-by-wire system master cylinder hydraulic pressure dynamics model;
[0093] The structure of the electronic power-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...
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The invention provides a hydraulic pressure preset performance control method for an electric main cylinder of a vehicle brake-by-wire system, and belongs to the field of vehicle brake-by-wire. The method comprises the steps that firstly, based on dynamic modeling of a power-assisted motor, a transmission shaft and a main cylinder, a control-oriented motor power-assisted brake-by-wire system main cylinder hydraulic dynamic model is obtained, then a proper preset performance function is designed, and preset performance change is conducted on the system; and finally, finite time terminal sliding mode control is performed on the changed system through a neural network adaptive nonlinear estimation method. Starting from the preset performance, the control method meeting the performance requirement is designed, and therefore precise control over the preset transient state and steady state response of the displacement and hydraulic pressure of the push rod of the main cylinder is achieved.
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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Patent Timeline
Login to View More IPC IPC(8): B60T13/74G06F30/17
CPCB60T13/745G06F30/17G06F2119/14
Inventor季园何承坤张俊智刘伟龙
OwnerTSINGHUA UNIV