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A detection method for adhesion stability and quasi-optimal slip ratio of electric vehicles

An adhesion stability, electric vehicle technology, applied in the direction of brakes, etc., can solve the problems of poor real-time and reliability, high reliability, and high cost, and achieve the effects of strong reliability, high observation accuracy, and increased effect.

Active Publication Date: 2021-01-12
SHANGHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a detection method for the adhesion stability and quasi-optimum slip rate of an electric vehicle in view of the defects of high cost, poor real-time performance and poor reliability in the prior art method, which is a method for judging vehicle adhesion stability based on the adhesion stability factor. The method of the adhesion state between the tire and the ground. The adhesion stability factor characterizes the transient characteristics of the vehicle's power transmission. Using its drastic change near the maximum attachment point, the vehicle's quasi-optimal slip rate and quasi-optimum adhesion torque can be detected in real time. high reliability

Method used

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  • A detection method for adhesion stability and quasi-optimal slip ratio of electric vehicles
  • A detection method for adhesion stability and quasi-optimal slip ratio of electric vehicles
  • A detection method for adhesion stability and quasi-optimal slip ratio of electric vehicles

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Embodiment 1

[0052] see figure 1 and figure 2 , the electric vehicle adhesion stability and quasi-optimal slip rate detection method is characterized in that the operation steps are as follows:

[0053] (1) Establish a closed-loop disturbance observer DOB to observe the tire-ground adhesion torque T d;

[0054] (2) Using the observed tire ground adhesion torque T d Calculate its variation ΔT d =T d (t 2 )-T d (t 1 ), using electric vehicle traction motor torque T to calculate its change value ΔT=T(t 2 )-T(t 1 ); 1 is the first detection moment, t 2 is the second detection moment, where the traction torque T is a given torque, or the actual output torque value of the traction motor;

[0055] (3) Using ΔT d The ratio of ΔT to calculate the attachment stability factor δ, when ΔT is 0, the denominator is set to a constant;

[0056] (4) Analyze the change law of the attachment stability factor. When the attachment stability factor δ changes sharply from positive to negative, from...

Embodiment 2

[0058] Such as figure 1 As shown, a detection method for electric vehicle adhesion stability and quasi-optimal slip ratio is characterized in that it includes an interrelated vehicle traction motor module, an adhesion torque observation module, an adhesion stability factor calculation unit, and a quasi-optimal slip ratio Rate and quasi-adhesion torque discrimination unit and vehicle wheel-to-ground system module, etc.

[0059] The vehicle traction motor module is used to obtain the output torque T of the traction motor and the vehicle wheel speed ω, and calculate the variation ΔT of the traction torque in real time. The traction torque T can be estimated by measuring the armature current parameters of the drive motor, etc., or the traction torque can be obtained through the given instruction of the driver inputting the pedal; and the real-time calculation of the motor torque change value ΔT=T(t 2 )-T(t 1 ); 1 is the first detection moment, t 2 is the second detection momen...

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Abstract

The invention relates to an electric vehicle attachment stability and quasi-optimal slip rate detection method. The electric vehicle attachment stability and quasi-optimal slip rate detection method is used for detecting the attachment stability, the quasi-optimal slip rate and the quasi-optimal attachment torque of a vehicle, and is applicable to electrically driven vehicles. According to the method, the traction motor torque T and a wheel speed omega are utilized to observe the tire-ground attachment torque T<d> through a load disturbance observer, the traction motor torque variation delta Tand the attachment torque variation delta T<d> are utilized to calculate an attachment stability factor delta, and the quasi-optimal slip rate lambda<opt> and the quasi-optimal attachment torque T<dmax> are identified according to the drastic change in the value of the attachment stability factor. The electric vehicle attachment stability and quasi-optimal slip rate detection method is easy to implement and high in reliability, and can be widely applied to the traction / braking anti-slip control process of electric vehicles.

Description

technical field [0001] The invention relates to the technical field of vehicle adhesion state detection, in particular to a detection method for electric vehicle adhesion stability and quasi-optimal slip rate. Background technique [0002] The vehicle ABS (anti-braking system) / TCS (Traction control System) system is used to ensure vehicle adhesion stability and improve driving safety and driving performance. But the high-performance ABS / TCS system needs to be controlled according to the optimal slip ratio between the tire and the ground. The optimal slip rate usually refers to the slip rate corresponding to the peak point of the current tire-ground adhesion characteristic curve or a slope of 1, at which point the longitudinal and lateral adhesion are relatively large. Considering that the operating point corresponding to the optimal slip ratio is usually a transient state in vehicle operation, it is difficult to capture it accurately. Here, the slip rate near the maximum a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W40/10B60W40/064B60T8/1761B60T8/1763
CPCB60T8/1761B60T8/1763B60W40/064B60W40/10
Inventor 杨影张金岛徐国卿黄志栋
Owner SHANGHAI UNIV
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