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Front-drive type electric vehicle energy recovery torque calibration method

A technology of braking energy recovery and energy recovery, applied in electric vehicles, control drive, power management, etc., can solve the problems of unanalyzed and imperfect constraints of front-wheel drive vehicles, shorten the calibration period, and reduce the frequency of activating ABS. Effect

Active Publication Date: 2021-11-12
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The calibration of braking energy recovery torque of rear-drive vehicles is analyzed above, but the constraints on the maximum braking feedback torque are not perfect, and the analysis of front-drive vehicles is not carried out.

Method used

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  • Front-drive type electric vehicle energy recovery torque calibration method
  • Front-drive type electric vehicle energy recovery torque calibration method
  • Front-drive type electric vehicle energy recovery torque calibration method

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Embodiment

[0037] Example: see figure 1 .

[0038] Such as figure 1 As shown, a method for calibrating energy recovery torque of a front-drive electric vehicle of the present invention comprises the following steps:

[0039] Step 1. According to the dynamic properties of the vehicle and the aerodynamic test to obtain the vehicle and driving parameters, set the initial braking energy recovery torque T m ;

[0040] Step 2. According to the vehicle and driving parameters obtained in step 1, calculate the total braking force F of the front axle at each speed range under different brake pedal openings bf , vehicle braking strength z and f line group;

[0041] Step 3. Confirm the brake pedal opening, when the brake pedal opening = 0, go to step 4; when the brake pedal opening > 0, go to step 5;

[0042] Step 4. According to the f line group obtained in step 2, calculate the road surface adhesion coefficient φ 0 = 0.2 braking energy recovery maximum torque T m0 , if the initial braking e...

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Abstract

The invention discloses a front-drive type electric vehicle energy recovery torque calibration method. The method comprises the steps that 1) whole vehicle and driving parameters of a vehicle are acquired, and an initial braking energy recovery torque Tm is set; 2) according to the obtained parameters, the front axle total braking force Fbf and the whole vehicle braking strength z and f line set of all vehicle speed sections under different brake pedal opening degrees are calculated; and 3) according to the calculation result in the step 2), the vehicle locking critical value braking force under a certain fixed value adhesion coefficient road surface serves as the maximum limit value of the braking energy recovery torque, the maximum impact degree when the recovery torque quits and the energy recovery torque required by braking regulations serve as constraint values, and the braking energy recovery torque is calibrated. When the method is used for calibrating the energy recovery torque of the automobile, the calibration period can be shortened and the ABS activation frequency can be reduced on the premise that the braking safety of the automobile and the smoothness in the speed reduction process of the whole automobile are not affected.

Description

technical field [0001] The invention relates to the technical field of vehicle energy recovery torque calibration, in particular to a calibration method for energy recovery torque of a front-drive electric vehicle. Background technique [0002] With the increasingly serious problems of environmental pollution and energy shortage and the continuous improvement of people's awareness of environmental protection, the new energy automobile industry has developed vigorously and rapidly. As an important research object in the field of new energy vehicles, pure electric vehicles have the advantages of energy saving, environmental protection, and low noise, and are the main direction of the development of the automobile industry. [0003] The driving motor of pure electric vehicles can realize the functions of driving and power generation. The motor braking energy recovery technology converts the braking energy of the vehicle into electric energy to charge the battery, which can redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/10B60L15/20
CPCB60L7/10B60L15/2009Y02T10/72
Inventor 彭永涛龚俊奇魏广杰
Owner JIANGLING MOTORS
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