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Electric vehicle energy recovery system and control method thereof

A technology of energy recovery and control method, which is applied in the direction of electric braking system, electric vehicle, control drive, etc., and can solve the problems that cannot meet the requirements of energy recovery rate, etc.

Active Publication Date: 2011-02-23
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is characterized by a relatively simple structure, but it cannot meet the requirements of the energy recovery rate of the current increasingly mature electric vehicle technology.

Method used

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  • Electric vehicle energy recovery system and control method thereof
  • Electric vehicle energy recovery system and control method thereof
  • Electric vehicle energy recovery system and control method thereof

Examples

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Embodiment Construction

[0023] Embodiments of the present invention are described in detail below.

[0024] like figure 1 , an electric vehicle driven by the front wheel is taken as an example to specifically illustrate how the present invention works.

[0025] The electric vehicle energy recovery system of the present invention includes a motor: a driving motor or a generator separately loaded on the drive shaft can be used to apply braking torque to the drive shaft when the vehicle is braking to convert the kinetic energy of the vehicle into electrical energy ;Battery: convert the electrical energy provided by the motor into chemical energy and store it; Pressure sensor: collect the pressure signal of the brake master cylinder of the automobile hydraulic braking system and feed it back to the vehicle controller; The pressure signal of the motor is used to calculate the braking torque of the motor, and output the braking torque of the motor to the motor controller; the motor controller: receives th...

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Abstract

The invention discloses an electric vehicle energy recovery system and a control method thereof. On the basis of the pressure of a brake master cylinder of an electric vehicle, a maximal brake force Fm which is allowed to be applied to a current driving wheel is obtained by calculating according to a brake force distribution curve in an electric vehicle brake system design and a driving wheel locking curve when the electric vehicle travels on a road surface with an ideal synchronous surface adhesion coefficient; and the Fm is converted into a torque, namely a maximal motor brake torque which can be applied currently so that the overall vehicle energy of the electric vehicle can be recovered to the maximum. Simultaneously, the calculated brake torque is corrected according to the requirements on the drivability and the safety of a vehicle, so that brake energy can be recovered to the maximum on the premise of ensuring the drivability and the safety of the electric vehicle.

Description

technical field [0001] The invention relates to the technical field of electric vehicle energy recovery, in particular to an electric vehicle energy recovery system and a control method thereof. Background technique [0002] Braking energy recovery is one of the ways that electric vehicles can improve energy usage. It can convert the kinetic energy of the car when braking into the electric energy storage of the battery through the electric motor, and then use it in the traction drive, avoiding the loss of energy into frictional heat energy, thereby improving the efficiency of energy use and increasing the size of the electric vehicle. driving mileage. [0003] The control method of the existing braking energy recovery system is generally to apply a fixed braking torque to the drive shaft when the car is braking, or to apply a fixed braking torque based on a fixed torque after being corrected by the engine speed or vehicle speed. to the drive shaft for energy recovery. Thi...

Claims

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Application Information

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IPC IPC(8): B60L15/20B60L7/10
CPCY02T10/72
Inventor 刘义强
Owner CHERY AUTOMOBILE CO LTD
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