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A Multi-objective Optimization Method for Wheel Torque of Electric Wheel Drive Vehicles Based on the Optimal Vehicle Comprehensive Performance

A technology of multi-objective optimization and comprehensive performance, applied in the field of wheel torque distribution of electric wheel drive vehicles, can solve the problem of studying stability or economy alone, restricting the development of high-performance electric wheel drive vehicles, and rarely taking into account the electric wheel Drive vehicle stability and economy to achieve the effect of ensuring vehicle stability, improving solution speed, and improving the ability of different driving conditions

Active Publication Date: 2019-11-12
JILIN UNIV
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Problems solved by technology

However, the current research generally studies stability or economy alone, and rarely considers the stability and economy of electric wheel drive vehicles at the same time, which limits the further development of high performance electric wheel drive vehicles

Method used

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  • A Multi-objective Optimization Method for Wheel Torque of Electric Wheel Drive Vehicles Based on the Optimal Vehicle Comprehensive Performance
  • A Multi-objective Optimization Method for Wheel Torque of Electric Wheel Drive Vehicles Based on the Optimal Vehicle Comprehensive Performance
  • A Multi-objective Optimization Method for Wheel Torque of Electric Wheel Drive Vehicles Based on the Optimal Vehicle Comprehensive Performance

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Embodiment Construction

[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0054] Such as figure 1 As shown, the present invention provides a multi-objective optimization method for wheel torque of an electric wheel drive vehicle based on the optimal overall performance of the vehicle, comprising the following steps:

[0055] Step 1. Obtain the basic parameters of the car, including vehicle mass m, wheel rolling radius R w , steering system angular transmission ratio i s , the vehicle wheelbase B, the number of driving axles N, the distance from each axle to the center of mass l i , the height H of the center of mass from the ground g , the vehicle wheelbase l, where, for a two-axle drive vehicle, the wheelbase l is the front and rear axle wheelbase, and for a multi-axle drive vehicle, l is the bogie wheelbase. And obtain the vehicle's driving s...

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Abstract

The invention discloses a wheel torque multi-objective optimization method for an electric wheel drive vehicle based on an optimal vehicle comprehensive performance. The method comprises the followingsteps: step one, calculating a vehicle requirement yaw moment of couple; step two, estimating each drive wheel slippage rate; step three, fitting an electric drive system loss characteristic curve; step four, establishing an online optimized objective function, and according to the requirement yaw moment of couple, the wheel slippage rate and the electric drive system loss, solving the objectivefunction to obtain each wheel torque; and step five, sending the requirement moment of force decided by each wheel to a controller of each wheel hub motor. According to the wheel torque multi-objective optimization method for the electric wheel drive vehicle based on the optimal vehicle comprehensive performance provided by the invention, in an online optimization process, by comprehensively considering the motor energy consumption, a yaw velocity tracking error and the slippage loss, the online optimization on each wheel driving torque of the electric wheel drive vehicle is performed, therebyimproving the vehicle economic efficiency as possible under the precondition of guaranteeing the vehicle stability, and realizing the optimal vehicle comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of wheel torque distribution methods of electric wheel-driven vehicles, and in particular relates to a multi-objective optimization method for wheel torque of electric wheel-driven vehicles based on the optimal comprehensive performance of the whole vehicle. Background technique [0002] Under the dual pressure of environmental pollution and energy shortage, electric vehicles have developed rapidly. The electric wheel drive vehicle saves the mechanical structure such as the transmission and differential of the traditional car, simplifies the structure and improves the transmission efficiency. The driving torque of each wheel of the electric wheel drive vehicle is independently controllable, and the rational distribution of the driving torque among the driving wheels can not only improve the stability of the electric vehicle, but also improve the driving economy. Electric wheel-driven vehicles can achieve be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/20B60W50/00
CPCB60L15/20B60W50/00B60W2050/0019B60W2520/12Y02T10/72Y02T10/84
Inventor 王军年罗正王岩杨斌郭德东王凯刘培祥
Owner JILIN UNIV
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