Coordinated braking control method of electric automobile

Abstract

The invention relates to a coordinated braking control method of an electric automobile, which comprises the following steps of: 1. setting a coordinated braking control system; 2. when the automobile is under a braking or sliding condition, carrying out analysis processing on a braking command by whole automobile controller in the following conditions: (1) the dynamic coordinated control at the initial period of the common braking of a motor braking system and a hydraulic braking system; (2) the coordinated control giving priority to braking safety, i.e. under the condition of requiring larger braking torque; (3) the coordinated braking control giving priority to braking energy recovery, i.e. small-strength braking; and (4) a dynamic part, wherein the charge state of the battery and the rotating speed of a motor of the electric automobile are synthetically considered, when the charge state of the battery is higher and the battery does not need to be charged, the maximum braking torque provided by the motor is reduced, but the required braking torque is still provided by the motor; and 3. proportionally distributing the analysis results in the steps between the motor braking system and the hydraulic braking system to finally achieve the purpose of carrying out the coordinated braking control on the electric automobile.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a coordinated braking control method for electric vehicles. Background technique [0002] With the increasing number of automobiles worldwide, the problems of energy crisis, environmental pollution and traffic safety brought to the society are becoming more and more serious. As an effective means to alleviate the pressure on the environment and resources, electric vehicles have achieved great development in recent years. As one of the cores of electric vehicles, the regenerative braking technology with the motor as the carrier is the key to realize its energy saving. Due to the limited regenerative braking torque provided by the motor, it cannot meet the requirements for braking performance on roads with a large adhesion coefficient. Therefore, the most commonly used nowadays is the compound braking technology, that is, the combination of regenerative braking and mecha...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the above-mentioned control method are: 1. When the maximum braking force provided by the motor is less than the demand and the electronic vacuum booster needs to be started, the hydraulic brake system will not be able to keep up with the total braking force at the moment of opening due to the problem of opening response lag. Demand for braking force, prone to danger

2. When the two brake together, the dynamic part of the braking force is provided by the hydraulic braking system, which will cause problems such as inaccurate response, poor followability to the total braking force, and poor vehicle stability.

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