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A Kinematics Modeling Method for Pure Electric Vehicles

A pure electric vehicle and kinematics technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problem of lack of accurate kinematics relationship model and so on

Active Publication Date: 2019-07-09
CHAOWEI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problems existing in the prior art, such as the lack of a high-accuracy kinematics relationship model, etc., and provides a pure electric vehicle kinematics modeling method with high precision and comprehensive parameters

Method used

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  • A Kinematics Modeling Method for Pure Electric Vehicles
  • A Kinematics Modeling Method for Pure Electric Vehicles
  • A Kinematics Modeling Method for Pure Electric Vehicles

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Experimental program
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Embodiment

[0055] Embodiment: the differential equation of pure electric vehicle kinematics is:

[0056]

[0057] In formula (1),

[0058] M—the total mass of the car, kg;

[0059] v(t)—vehicle speed, m / s;

[0060] F(t)—driving traction force, N;

[0061] g—the acceleration of gravity, its value is 9.8N / kg=9.8m / s 2 ;

[0062] β—slope angle, deg;

[0063] C 0 —Static rolling resistance coefficient, dimensionless, 0.004~0.02, generally 0.01;

[0064] C 1 —Rolling resistance coefficient, the general value is 1.75×10 -6 the s 2 / m 2 ;

[0065] ρ—air density, kg / m 3 , the general value is 1.17kg / m 3 (25,1atm);

[0066] C D —Air resistance coefficient, dimensionless, 0.2~0.4;

[0067] A—the frontal area of ​​the vehicle, m 2 , the average car is about 2.1m 2 .

[0068] The vehicle speed-time curve equation considering vehicle rolling dynamics can be written as,

[0069]v(t)=a tanh(bt), m / s (2)

[0070] where a(m / s) and b(s -1 ) is an undetermined constant, and there is...

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Abstract

The invention discloses a kinematic mechanics modeling method of a pure electric vehicle. The method comprises the steps of (S001) calculating a second intermediate quantity K2 and a third intermediate quantity K3 according to grade angles under different vehicle weight and performance conditions; (S002) calculating a first constant a and a second constant b according to travel time T, a running speed v(t) and a travel distance S under different performance conditions; (S003) calculating a first intermediate quantity K1 according to the first constant a and the second constant b; (S004) building a traction time curve relation equation; and (S005) building a power time curve relation equation. The influences caused by the kinematic mechanics process and various parameters of the pure electric vehicle can be accurately described through a traction time curve and a power time curve; and a guidance is provided for performance test and design. The kinematic mechanics modeling method is suitable for the field of pure electric vehicle design and test.

Description

technical field [0001] The invention relates to the field of control of pure electric vehicles, in particular to a modeling method for kinematics of pure electric vehicles. Background technique [0002] At present, lead-acid battery enterprises are still stuck in the inspection standard of "GB / T 22199-2008 Sealed Lead-acid Batteries for Electric Bicycles", which cannot meet the three power performances of acceleration performance, maximum vehicle speed, and maximum climbing ability required by customers, so the battery characteristics should be Only by understanding and analyzing from the perspective of vehicle discharge and the perspective of users can the commerciality of batteries be improved. [0003] A reasonable kinematics model can intuitively express the changes brought about by the changes of various influencing factors, and improve the accuracy of designing and testing the performance of electric vehicles. At present, there is no model that accurately describes th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 周犹运倪月凤章小琴陈体衔
Owner CHAOWEI POWER CO LTD