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A turning control method for an electro-hydraulic composite braking system of an electric vehicle

An electro-hydraulic composite and braking system technology, applied in electric braking systems, electric vehicles, control devices, etc., can solve problems such as inability to provide yaw moment, and achieve the effect of improving stability

Active Publication Date: 2021-03-02
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most electric vehicles are front-drive, and the regenerative braking force (via electric motor braking) will apply to both wheels at the same time, which cannot provide yaw moment, so only hydraulic braking force can provide yaw moment

Method used

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  • A turning control method for an electro-hydraulic composite braking system of an electric vehicle
  • A turning control method for an electro-hydraulic composite braking system of an electric vehicle
  • A turning control method for an electro-hydraulic composite braking system of an electric vehicle

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Embodiment Construction

[0033]The present invention will be described in further detail below, so that those skilled in the art can implement it with reference to the text of the description.

[0034]The present invention provides a turning control method of an electric vehicle electro-hydraulic composite braking system, which includes the following steps:

[0035]Step 1. In the vehicle turning and braking process, the steering wheel angle sensor is used to detect the steering wheel angle δ in real time, the vehicle speed V is detected by the vehicle speed sensor, and the vehicle braking intensity z is obtained; and according to the steering wheel angle δ, vehicle speed V, and vehicle braking intensity z Determine the lateral stability coefficient ε of the car;

[0036]The lateral stability coefficient ε of the automobile is:

[0037]

[0038]Among them, S1And S2All are empirical parameters; δ represents the steering wheel angle, δ0Represents the set reference value of steering wheel angle; V represents vehicle speed, V0...

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Abstract

The invention discloses a turning control method for an electro-hydraulic composite braking system of an electric vehicle. The dynamic strength z determines the vehicle lateral stability coefficient ε; step 2, obtains the road surface adhesion coefficient μ, the ambient temperature T, the battery SOC, and the vehicle yaw rate W r ; and according to the difference W between the road surface adhesion coefficient μ, ambient temperature T, battery SOC, vehicle yaw rate and expected vehicle yaw rate r ′ and the vehicle lateral stability coefficient ε determine the braking force provided by the vehicle hydraulic braking system and the braking force provided by the regenerative braking system.

Description

Technical field[0001]The invention belongs to the technical field of electric vehicle electro-hydraulic compound braking, and particularly relates to a turning control method of an electric vehicle electro-hydraulic compound braking system.Background technique[0002]Regenerative braking, also known as feedback braking, is a braking technology used in electric vehicles. Convert and store the kinetic energy of the vehicle when braking; instead of turning it into useless heat.[0003]Regenerative braking switches the motor to generator operation in the braking condition, uses the inertia of the car to drive the motor rotor to rotate to produce a reverse torque, converts a part of the kinetic energy or potential energy into electrical energy and stores or uses it, so this is an energy The process of recycling.[0004]In electric vehicles, the regenerative braking system and the hydraulic braking system work together to form an electro-hydraulic composite braking system. The braking force dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W30/045B60L7/26B60L7/18
CPCB60L7/18B60L7/26B60L2240/12B60L2240/54B60W30/045B60W2510/244B60W2520/10B60W2520/12B60W2540/18
Inventor 郝亮
Owner LIAONING UNIVERSITY OF TECHNOLOGY