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Combined brake controlling system and method for electromobile

A technology of electric vehicle and brake control, applied in electric braking system, electric vehicle, vehicle components, etc., can solve the problems of poor linearity of total braking force, maximum recovery of unfavorable energy, different braking feeling of drivers, etc. , to achieve high energy utilization efficiency, good braking effect, and better braking effect

Active Publication Date: 2007-06-27
BYD CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this is not conducive to the maximum recovery of energy; on the other hand, the characteristics of the motor determine that its braking torque is not linearly adjustable under various vehicle speed conditions, so the linearity of the total braking force of this scheme is not good, and it is easy to Make the driver have a different braking feeling

Method used

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  • Combined brake controlling system and method for electromobile
  • Combined brake controlling system and method for electromobile

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Embodiment Construction

[0019] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0020] Hydraulic pipeline description:

[0021] The main control component of the combined braking system is a proportional valve that can control the output pressure, and the auxiliary components include a two-position two-way solenoid valve 5 that provides a passage for oil return, and a master cylinder oil pressure sensor 2 that detects the brake oil pressure. Wheel cylinder oil pressure sensor 3. The piping connections of the system are shown in Figure 1. In this system, electric braking only acts on the front wheels.

[0022] System control principle description:

[0023] When the accelerator pedal is released without depressing the brake pedal, the motor enters the feedback braking state and provides a fixed value of braking torque (making the deceleration of the vehicle at 0.15G, which is consistent with the traditio...

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Abstract

The present invention discloses combined brake controlling system and method for electromobile. The system includes combined brake ECU, braking pedal displacement sensor, proportional valve, master cylinder oil pressure sensor and wheel cylinder oil pressure sensor. The brake signals the brake pedal displacement sensor and the master cylinder oil pressure sensor acquire are fed to the combined brake ECU, and the combined brake ECU synthesizes and judges to obtain total brake requirement, acquires the available maximum electrically brake moment from the motor ECU to obtain the required hydraulic brake and outputs control signal to the proportional valve for outputting the hydraulic brake force, so as to realize the combined braking of electric braking and hydraulic braking. The present invention has the brake effect and feeling the same as that of traditional process, maximum energy recovery, high operation performance, high brake effect and high energy utilization efficiency.

Description

【Technical field】 [0001] The invention relates to a combined braking control system and control method of an electric vehicle. 【Background technique】 [0002] With the continuous improvement and improvement of electric vehicles, in order to extend the driving range under the condition of a certain total battery power, many electric vehicles are equipped with energy recovery devices. Especially during the braking process of the car, the motor is temporarily in the feedback braking state, which can charge the battery, thereby realizing energy recovery. However, because the braking torque generated by the electric motor in the state of power generation is limited, it is necessary to add hydraulic braking. Therefore, the so-called electric vehicle combined braking system includes electric braking and traditional hydraulic braking for energy feedback. Due to the existence of electric braking, in order to make the combined braking conform to the braking feeling of traditional ve...

Claims

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Application Information

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IPC IPC(8): B60L7/24
Inventor 张凯单明磊
Owner BYD CO LTD
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