An electric vehicle driving condition simulation test bench and simulation method
A technology that simulates test benches and driving conditions. It is used in vehicle testing, machine/structural component testing, and instrumentation. It can solve problems such as poor versatility, narrow application scope, and single function, and reduce R&D costs and application scope. Extensive, easy-to-place effects
Active Publication Date: 2021-08-10
CHANGAN UNIV
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Problems solved by technology
[0003] However, the existing indoor test platforms have relatively single functions, narrow application range, and poor versatility, such as drive motor performance test benches, power battery system test benches, etc.
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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0039] 1. Electric vehicle operating condition simulation theory
[0040] 1.1 Driving resistance of electric vehicles
[0041] When the vehicle is running on the road, in addition to the driving force, it will also be affected by the running resistance. This resistance usually includes the rolling resistance F f , air resistance F w , Slope resistance F i and acceleration resistance F j . Same as traditional cars, electric vehicles also follow the car driving equation when driving on the road normally, that is, the driving force is equal to the driving resistance, that is:
[0042] f t =F f +F w +F i +F j (1)
[0043] or
[0044] Among them, F t is the driving force of the electric vehicle, f is the rolling resistance coefficient, g is the acceleration due to gravity, and A is the windward area (m 2 ), C D is the air resistance coef...
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The invention discloses a driving condition simulation test bench and a simulation method of an electric vehicle. The test bench uses the test drive motor to simulate the motor running state of the electric vehicle under simple working conditions and cyclic working conditions, and uses the output of the dynamometer coaxially connected with the test drive motor The load torque that matches the resistance, using the closed-loop control of the speed based on the single-chip microcomputer, solves the problem of precise control of the speed of the test drive motor under cyclic working conditions. The matching accuracy with the driving resistance in the actual working conditions enables the test drive motor to operate according to the simulated driving conditions of the electric vehicle, which not only reduces the scale of the test bench, but also meets the research and analysis needs of different electric vehicle power drive systems, and realizes multiple The simulation of different driving conditions has a wide range of applications.
Description
technical field [0001] The invention relates to the field of development and testing of electric vehicles, in particular to a small-scale driving condition simulation and performance testing test bench and a driving condition simulation method. Background technique [0002] The power drive system is the most important part of the analysis and development of electric vehicles, and its performance is directly related to the overall performance of electric vehicles. Therefore, in the process of electric vehicle research and development, the test technology and test conditions of the drive system have an increasing influence on the development of the whole vehicle. At present, there are three main methods of electric vehicle test research: computer simulation research, outdoor road real vehicle test research and indoor bench test research. It is difficult to establish an accurate mathematical model for computer simulation tests, and it is difficult for the data obtained from si...
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IPC IPC(8): G01M17/007
CPCG01M17/007
Inventor 林广宇蹇小平郭金刚沈百新刘浩丰
Owner CHANGAN UNIV