Brake force real-time adjusting method based on brake-by-wire system and adjusting device

A technology of real-time adjustment and brake-by-wire, which is applied to electric braking systems, brakes, electric vehicles, etc., and can solve the problems that the fluctuation and instability of the brake cannot be suppressed, the braking effect is affected, and the safety of the car is affected.

Active Publication Date: 2012-07-18
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of real-time adjustment of the braking force output by the electronic mechanical brake using the above method, due to the large fluctuation of the actual current of the motor in the electronic mechanical brake, the adjustment of the braking force output by the electronic mechanical brake is not accurate enough, thus As a result, the brake-by-wire brake system where the electronic mechanical brake is located has low braking accuracy and poor braking effect, which seriously affects the braking performance of the vehicle, and the braking performance of the vehicle

Method used

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  • Brake force real-time adjusting method based on brake-by-wire system and adjusting device
  • Brake force real-time adjusting method based on brake-by-wire system and adjusting device
  • Brake force real-time adjusting method based on brake-by-wire system and adjusting device

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Experimental program
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Effect test

Embodiment 1

[0086] Such as figure 1 As shown, the brake force real-time adjustment method based on the brake-by-wire system described in this embodiment specifically includes the following steps:

[0087] s101. Collect the stroke of the electronic brake pedal in real time, and convert the stroke into a displacement signal value of the electronic brake pedal in real time.

[0088] Preferably, the stroke of the electronic brake pedal is collected in real time by a pedal unit sensor built in the electronic brake pedal; for each stroke position of the electronic brake pedal, the pedal unit sensor can output a corresponding The displacement voltage value is used as the displacement signal value, that is, the stroke of the electronic brake pedal collected by the pedal unit sensor in real time is converted into the displacement signal value of the electronic brake pedal in real time.

[0089] s102. Converting the displacement signal values ​​into braking forces that should be output by the elec...

Embodiment 2

[0122] Such as Figure 4 As shown, the difference between the real-time adjustment method of braking force based on the brake-by-wire system described in this embodiment and the real-time adjustment method of braking force in Embodiment 1 is that:

[0123] In this embodiment, an adaptive fuzzy PID controller is used to perform closed-loop position adjustment on the deviation between the target position signal value Us* of the motor in each electromechanical brake and the actual position signal value Us of the motor, that is, the self-adaptive fuzzy PID controller is adopted The deviation is adjusted by combining fuzzy control and PID control. Specifically:

[0124] According to the proportional coefficient K in the output value of the PID controller P , Differential coefficient K I and integral coefficient K D , the fuzzy relationship between the deviation e between the target position signal value of the motor and the actual position signal value of the motor and the rate...

Embodiment 3

[0135] In this embodiment, the real-time adjustment method of braking force based on the brake-by-wire system includes the following steps:

[0136] 1) Obtain the target position signal values ​​of the motors in the electronic mechanical brakes for braking the front wheels and / or rear wheels of the vehicle respectively according to the stroke of the electronic brake pedal;

[0137] 2) respectively collecting in real time the actual position signal value of the motor in each electromechanical brake for braking the front wheel and / or rear wheel of the vehicle, the actual speed signal value of the motor, and the actual current signal value of the motor;

[0138] 3) According to the deviation between the target position signal value of the motor in each electromechanical brake of the braking vehicle front wheel and / or rear wheel and the actual position signal value of the motor collected in real time, and the real-time collected motor position The actual rotational speed signal va...

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Abstract

The invention provides a brake force real-time adjusting method based on a brake-by-wire system. The brake force real-time adjusting method comprises following steps: respectively obtaining objective position signal values of motors in various electronic and mechanical brakes of front wheels and/or rear wheels of a brake vehicle according to strokes of electronic brake pedals; respectively acquiring actual position signal values, actual rotation speed signal values and actual current signal values of the motors in real time; and respectively realizing real-time closed-loop control for positions, rotation speeds and current of the motors according to deviation between the objective position signal values and the actual position signal values of the motors, the actual rotation speed signal values and the actual current signal values, and accordingly adjusting actually outputted brake force of the electronic and mechanical brakes with the motors in real time. Correspondingly, the invention provides a brake force real-time adjusting device. The brake force real-time adjusting method and the adjusting device can suppress fluctuation generated when brake force is adjusted in real time in the prior art, stability of the brake-by-wire system is improved, and a braking effect is good.

Description

technical field [0001] The invention belongs to the technical field of brake by wire (Brake by wire), and in particular relates to a real-time adjustment method for braking force based on a brake by wire system and a real-time adjustment device for brake force based on a brake by wire system. Background technique [0002] With the development of automobile technology, people put forward higher requirements for the power, economy, safety, maneuverability and comfort of automobiles, and the mechanical systems in automobiles are gradually converting to electromechanical systems. [0003] In the brake-by-wire system, the electronic brake pedal and multiple electromechanical brakes (EMB, Electro Mechanical Brake) respectively arranged on the front and rear wheels of the vehicle are generally used to complete the braking operation. The driver steps on the electronic brake pedal to generate Pedal displacement signal, through which the braking force acting on the front and rear whee...

Claims

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Application Information

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IPC IPC(8): B60T8/172B60L7/00
Inventor 杜金枝高国兴王陆林张世兵
Owner CHERY AUTOMOBILE CO LTD
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