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Method and system for recycling sliding energy of automobile

A technology for energy recovery and automobiles, which is applied in the field of automobiles, can solve the problems that the hybrid power system or transmission system cannot be applied, and the calibration parameters are not intuitive enough, so as to achieve the effect of ensuring driving comfort

Active Publication Date: 2014-08-20
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing hybrid electric vehicles usually directly calibrate the feedback torque of the motor according to the vehicle state, such as vehicle speed, gear position, engine speed, battery state of charge, etc., when performing coasting energy recovery, and these calibration parameters are not intuitive enough and cannot be applied different hybrid systems or drivetrains

Method used

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  • Method and system for recycling sliding energy of automobile
  • Method and system for recycling sliding energy of automobile
  • Method and system for recycling sliding energy of automobile

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Effect test

Embodiment 1

[0051] figure 1 It is a schematic flowchart of a method for recovering energy from vehicle coasting provided in the embodiment of the present application.

[0052] Such as figure 1 As shown, the method includes the following steps:

[0053] S100: Obtain the current vehicle speed, calculate the dragging resistance torque at the engine end according to the current vehicle speed and the calibrated coasting deceleration, and calculate the initial feedback torque of the motor according to the dragging resistance torque.

[0054]When recovering the sliding energy of the vehicle, it is first necessary to obtain the current speed of the vehicle, and determine how to recover the sliding energy according to the magnitude of the current speed. The calibrated coasting deceleration refers to the corresponding relationship between the allowed coasting deceleration and the vehicle speed. In practical applications, it can be obtained through experimental calibration.

[0055] In the embodi...

Embodiment 2

[0081] On the basis of the previous embodiment, the present application also provides a vehicle sliding energy recovery system, image 3 It is a schematic structural diagram of a vehicle coasting energy recovery system provided in an embodiment of the present application.

[0082] Such as image 3 As shown, 1 in the figure is the battery, and 2 is the motor. The vehicle coasting energy recovery system includes: vehicle speed acquisition unit 3, battery status acquisition unit 4, motor speed acquisition unit 5, motor initial feedback torque calculation unit 6, battery constraint Feedback torque calculation unit 7 , motor constraint feedback torque calculation unit 8 , comparison unit 9 , motor final feedback torque determination unit 10 and motor control unit 11 .

[0083] The vehicle speed obtaining unit 3 is connected with the vehicle engine or the wheels, and is used to obtain the current vehicle speed of the vehicle. In practical applications, the vehicle speed obtaining u...

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Abstract

This application discloses a method and system for recovering energy from vehicle coasting. The method first calculates the initial feedback torque of the motor according to the current speed of the vehicle and the calibrated coasting deceleration, and then calculates the initial feedback torque according to the temperature and state of charge of the battery. Get the constrained feedback torque of the battery, and then calculate the constrained feedback torque of the motor according to the speed of the motor, and finally select the one with the smallest absolute value among the initial feedback torque of the motor, the constrained feedback torque of the battery and the constrained feedback torque of the motor As the final feedback torque of the motor, and use the final feedback torque of the motor to recover the sliding energy of the car. Compared with existing technologies, this method not only ensures driving comfort, but also maximizes the recovery of coasting energy.

Description

technical field [0001] The present application relates to the technical field of automobiles, in particular to a method and system for recovering energy from automobile coasting. Background technique [0002] A hybrid vehicle refers to a vehicle loaded with two or more power sources, usually with a more powerful motor and battery introduced on the basis of a traditional vehicle. During driving, when the driver needs a large torque under acceleration or climbing conditions, the battery discharges, the motor assists, and the engine and the motor jointly output torque; and when the driver is braking , the motor enters power generation mode to charge the battery. [0003] In order to further improve the energy utilization rate, the existing hybrid electric vehicle also performs a certain degree of energy recovery in the free gliding state, but at this time, if the motor feedback torque is too small, the energy recovery is insufficient, and if the motor feedback torque is too la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W30/18B60W40/10B60W40/105
Inventor 洪木南严钦山李宗华苏岭刘杰
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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