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Braking and gear shifting control method and system for electric vehicle

A control method and technology for electric vehicles, applied in electric braking systems, electric vehicles, control drives, etc., can solve problems such as short driving range, achieve high shift quality, excellent economy, and ensure acceleration before and after shifting Effect

Pending Publication Date: 2022-04-12
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the limited battery capacity and the lack of popular charging stations make the short driving range an important obstacle to the further development of electric vehicles

Method used

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  • Braking and gear shifting control method and system for electric vehicle
  • Braking and gear shifting control method and system for electric vehicle
  • Braking and gear shifting control method and system for electric vehicle

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Embodiment Construction

[0095] Embodiments of the present invention will be described in detail below, and examples of the embodiments are illustrated in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below are illustrative of the invention, and is intended to be construed as limiting the invention.

[0096] An electric vehicle brake shifting control method, the motor, transmission integration control, ensures the same speed before and after the shift, so that the shock impact is smaller, the shift is better, the economy of the car is improved, and the mileage is improved. , Including steps, such as figure 1 Looking:

[0097] Step S1, calculate the total demand braking force:

[0098] At the beginning of the brake, the vehicle speed U, the brake pedal sensor collected by the vehicle speed sensor is collected to brake strength Z, input to the brake calculation module, resulting...

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Abstract

The invention provides a braking and gear shifting control method and system for an electric vehicle. The method comprises the following steps that the total required braking force is calculated; determining a braking force distribution strategy according to a front and rear axle brake braking force distribution curve, and calculating regenerative braking force; optimizing the speed ratio; performing constant-acceleration gear shifting control; the required braking force obtained under the same braking strength z obtains a fixed regenerative braking torque according to a braking force distribution strategy, so that the acceleration at the current gear is obtained, then the speed does not suddenly change before and after gear shifting, the change of the transmission ratio can bring different reverse rotation speeds of the motor, and the speed change of the motor is changed. At the moment, new regenerative braking torque is generated, new acceleration is generated at the same time, the two accelerations are made to be equal, the relation between the front regenerative braking torque and the rear regenerative braking torque and distribution of the front regenerative braking torque and the rear regenerative braking torque on a motor efficiency curve graph are obtained, and therefore the economical requirement is met.

Description

Technical field [0001] The invention belongs to the field of new energy automotive brakes, and more particularly to an electric vehicle brake shift control method and system. Background technique [0002] Electric cars is a type of new energy vehicle that relies on battery energy storage and powers to the whole vehicle, thus driving the car. The motor replaces the traditional internal combustion engine, the battery replaces the traditional fuel tank and is rich in electrical energy of renewable energy. The maximum feature of electric vehicles is to achieve zero emissions, zero pollution, small and structural, simple maintenance, and convenient maintenance. However, the battery capacity is limited and the charging station is not universal, so that the renewal mileage is short into an important obstacle to further development of electric vehicles. [0003] Since the battery capacity in the short period does not increase, the regenerative braking technique begins to appear in everyo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/10B60L15/20
CPCY02T10/72B60L15/20B60L7/10
Inventor 潘公宇徐申刘志康冯雅琪张宇佳薛磊
Owner JIANGSU UNIV
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