Hierarchical system used for four-wheel-hub motor-driven electric automobile, and control method

A technology for in-wheel motors and electric vehicles, which is applied to electric vehicles, power-consuming devices, and control drives, etc., can solve the problems of reducing the control effect and failing to achieve the effect, and achieve the effect of improving the maneuverability.

Inactive Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its control effect can meet the stability control requirements in general road conditions, but when the four-wheel-drive electric vehicle is turning, high-speed, or on a bad road, the effect of these control methods o...

Method used

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  • Hierarchical system used for four-wheel-hub motor-driven electric automobile, and control method
  • Hierarchical system used for four-wheel-hub motor-driven electric automobile, and control method
  • Hierarchical system used for four-wheel-hub motor-driven electric automobile, and control method

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Experimental program
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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] see figure 1 , a layered system for electric vehicles driven by four-wheel hub motors includes a first hub motor 1, a second hub motor 2, a third hub motor 3 and a fourth hub motor 4, the first hub motor 1, the second hub motor 2. The third in-wheel motor 3 and the fourth in-wheel motor 4 pass through the first motor controller 5, the second motor controller 6, the third motor controller 7 and the fourth motor controller 8 respectively, the first motor controller 5, The second motor controller 6, the third motor controller 7 and the fourth motor controller 8 are all connected to the vehicle controller 14, and the vehicle controller 14 is connected to the steering wheel angle sensor 9, the electronic accelerator pedal 10, the electronic brake pedal 11, the inertial Measuring unit 12 and vehicle speed sensor 13 .

[0037] The vehicle controller 13 collects the r...

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Abstract

The invention discloses a hierarchical system used for a four-wheel-hub motor-driven electric automobile, and a control method. First of all, yaw moment is calculated as a yaw moment decision-making layer according to a vehicle speed sensor, a steering wheel rotary angle transmitter, an electronic throttle sensor and an inertia measurement unit; then according to automobile longitudinal force constraints, yaw moment constraints, a maximum adhesion force which can be provided by a pavement and restrictions of motor maximum output moment, target torque of each wheel hub motor is calculated as a target optimization analysis layer; and finally, degrees of similarity to six standard pavements are obtained by inputting two parameters, i.e., an adhesion coefficient and a wheel slip rate into a pavement adhesion coefficient estimation fuzzy controller by means of a current pavement, and an adhesion coefficient estimated value of the current pavement is obtained as a pavement adhesion coefficient monitoring layer after weighted averaging is performed. According to the invention, whole-vehicle stability is taken as a control target, motor torque is reasonably distributed according to operation working conditions, and the controllability, the stability and the economic property of vehicles are improved.

Description

technical field [0001] The invention belongs to the technical field of intelligent control of electric vehicles, and in particular relates to a layered system and a control method for electric vehicles driven by four-wheel hub motors. Background technique [0002] In recent years, due to the increasingly prominent dual issues of environmental protection and energy security, electric vehicles have once again jumped into people's field of vision. Since electric vehicles use high-efficiency rechargeable batteries, zero exhaust emissions during operation can greatly reduce environmental pollution. At the same time, compared with traditional fuel-powered vehicles, electric vehicles driven by four-wheel hub motors have the following advantages: First, the torque response speed of the motor is 50-100 times that of internal combustion engines, and the torque and speed of each wheel can be accurately controlled. Secondly, the transmission shaft, clutch and other mechanisms are remov...

Claims

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Application Information

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IPC IPC(8): B60L15/20
CPCB60L15/20B60L2240/24B60L2240/12B60L2240/423B60L2220/44B60L2220/42Y02T10/72
Inventor 张政赵宁王俊晗熊志强远绍羊
Owner XI AN JIAOTONG UNIV
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