Method and device for energy recovery of electric vehicle
A technology for energy recovery and electric vehicles, applied in electric vehicles, electric energy management, control drive, etc., can solve the problems of not considering the transmission efficiency and state, the wear of the main reducer of the drive axle, etc., and achieve the effect of improving energy recovery efficiency
Active Publication Date: 2020-11-20
WEICHAI POWER CO LTD
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Problems solved by technology
The existing energy recovery method is to recover energy through constant torque energy recovery or torque reduction with vehicle speed reduction.
Due to the lack of consideration of the transmission efficiency and state of each component in the energy recovery process, the main reducer of the drive axle in practical applications is severely worn
Method used
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Embodiment approach
[0088] Optionally, in another embodiment of the present invention, an implementation of step S303 includes:
[0089] The third torque is calculated by using the formula T3=(9550*U*I) / n. In the formula, U is the current voltage, n is the current rotational speed, and I is the maximum current allowed to be input.
[0090] S103. According to the vehicle state information, the first corresponding relationship, the second corresponding relationship and the third corresponding relationship, calculate and obtain the optimal recovery torque.
[0091] Wherein, the optimal recovery torque does not exceed the maximum value of the upper limit of the recovery torque; the first corresponding relationship is: the corresponding relationship of speed-torque-efficiency in the electric drive system; the second corresponding relationship is: the vehicle speed-torque-efficiency of the drive axle Corresponding relationship of efficiency; the third corresponding relationship is: the corresponding re...
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The present invention provides a method and device for energy recovery of an electric vehicle. The method includes: obtaining vehicle state information; calculating an upper limit of recovery torque according to the vehicle state information; The second corresponding relationship and the third corresponding relationship are calculated to obtain the optimal recovery torque; wherein, the optimal recovery torque does not exceed the maximum value of the upper limit of the recovery torque; the first corresponding relationship is: the speed in the electric drive system- The corresponding relationship of torque-efficiency; the second corresponding relationship is: the corresponding relationship of vehicle speed-torque-efficiency of the drive axle; the third corresponding relationship is: the corresponding relationship of the speed-torque-life characteristic value of the drive axle; Sending the optimal regenerative torque to the electric drive system. By sending the calculated optimal regenerative torque to the electric drive system, the electric drive system can maximize the energy recovery efficiency of the vehicle while considering the service life of the drive axle.
Description
technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a method and device for recovering energy from electric vehicles. Background technique [0002] With the development of science and technology, people begin to pay more attention to the environment we live in, and the demand for new energy is becoming more and more urgent. New energy vehicles refer to the use of unconventional vehicle fuels as power sources (or use conventional vehicles, and then adopt new power devices, including hybrid electric vehicles, pure electric vehicles), fuel cell electric vehicles and other new energy vehicles. According to its own energy and technology development status, China has selected pure electric vehicles as its main strategic orientation. [0003] Pure electric vehicles use the on-board power supply (rechargeable battery) as the energy storage method, and use the electric motor as the power to drive the wheels. In the research a...
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IPC IPC(8): B60L15/20G06F17/10G06F30/20
CPCB60L15/20G06F17/10G06F30/20Y02T10/72
Inventor 徐亚美高乐吕凤龙胥巧丽胡刚毅张磊
Owner WEICHAI POWER CO LTD