Electronic parking clamping force control method

Abstract

The invention relates to the field of vehicle braking systems, in particular to an electronic parking clamping force control method; an electronic parking system is powered by a vehicular power supply, and clamping force F is controlled based on output power W1 of the vehicular power supply to the electronic parking system; namely, function relationship, clamping force F=f(W1), between the output power W1 and the clamping force F is established. The electronic parking clamping force control method controls the clamping force by using actual parking work of the electronic parking system as a variable, the error due to voltage fluctuation and working temperature fluctuation of the electric parking system power supply is eliminated, the precision of controlling the electronic parking clamping force is improved, and the performance availability of the electronic parking system is improved greatly, the self-weight of the electronic parking system is reduced, vehicle energy is saved, and vehicle cost is reduced.

Description

technical field [0001] The patent of the present invention relates to the field of vehicle braking systems, in particular to an electronic parking clamping force control method. Background technique [0002] At present, electronic parking is more and more widely used in automobiles. In the electronic parking brake system, the rotational motion of the motor is decelerated and increased in torque through the deceleration mechanism, and then the rotational motion is converted into linear motion through the threaded structure, and finally the brake is triggered to clamp the brake disc for braking. [0003] The clamping force control of electronic parking is a basic part of the electronic parking function. At present, the clamping force control of electronic parking usually adopts the current method, that is, the current I and the clamping force F are established. 夹紧力 a function of ; that is, F 夹紧力 =f(I); the above control method is simple, but the control precision is poor. ...

AI Technical Summary

Problems solved by technology

[0003] The clamping force control of electronic parking is a basic part of the electronic parking function. At present, the clamping force control of electronic parking usually adopts the current method, that is, the current I and the clamping force F are established. 夹紧力 The functional relationship of ; that is, F 夹紧力 = f(I); the above control method is simple, but the control accuracy is poor

[0004] In practical applications, there are two factors that lead to the poor control accuracy of the above clamping force. One of the factors is the fluctuation of voltage. In the actual vehicle system, the power supply voltage is output to the electronic The parking voltage cannot be stabilized at the expected 12V, and the actual normal operating voltage of the electronic parking system fluctuates in the range of (9~16)V. The fluctuation of the voltage leads to poor control accuracy of the clamping force; the second factor is the change of temperature, The working temperature of the electronic parking mechanical actuator is affected by the ambient temperature and the heat generated by the brake. The actual working temperature fluctuates in the range of (-30 ~ 500) °C. The difference in temperature will lead to the transmission efficiency of the electronic parking mechanical actuator and The clamping stiffness changes, and the load change leads to poor clamping force control accuracy

In order to ensure the safety of parking, the usual practice is to conduct a cross-validation test based on a certain current, considering the changes in voltage and temperature, and select the minimum clamping force obtained from the test as the design value of the clamping force under this current. However, this method leads to redundant electronic parking structures, low performance utilization, increases product weight, wastes vehicle energy, and increases the cost of a single vehicle

Images