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Electric vehicle mass, spring and damping model three-parameter extraction method

An electric vehicle and extraction method technology, which is applied in the field of three-parameter extraction of spring, electric vehicle mass and damping model, can solve the problems of difficulty in determining the spring-loaded mass, the vertical stiffness of the suspension and the damping coefficient of the shock absorber, and achieve the cost of the sensor. Simple and clear process

Active Publication Date: 2022-02-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The invention aims to solve the problem that it is difficult to measure the sprung mass, the vertical stiffness of the suspension and the damping coefficient of the shock absorber of the electric vehicle without disassembly

Method used

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  • Electric vehicle mass, spring and damping model three-parameter extraction method
  • Electric vehicle mass, spring and damping model three-parameter extraction method
  • Electric vehicle mass, spring and damping model three-parameter extraction method

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Embodiment Construction

[0040] The specific technical solutions of the present invention are described in conjunction with the examples.

[0041] The three-parameter extraction method of electric vehicle sprung mass, equivalent stiffness of suspension spring, and equivalent damping of shock absorber includes the following steps:

[0042] S1. Selection and installation of sensors

[0043] The frequency range of the vertical vibration acceleration signal collected by the acceleration sensor to collect the sprung mass of the vehicle should be able to meet the requirements of 0.3-100Hz. Before the experiment, the acceleration sensor is arranged on the body above the front axle of the car, and a certain axis of the sensor should be perpendicular to the ground during installation. like figure 1 As shown, point F is the installation position of the acceleration sensor.

[0044] S2. No-load vibration experiment

[0045] (1) In order to eliminate the coupling problem of the vertical vibration of the front...

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Abstract

The invention provides an electric vehicle mass, spring and damping model three-parameter extraction method, which is based on a quarter linear two-degree-of-freedom vehicle model, considers the influence of a damping coefficient of a shock absorber on free attenuation vibration angular frequency of sprung mass of the vehicle, and completes extraction of the three parameters by the derived vertical acceleration damped oscillation frequency expression of the sprung mass of the vehicle. According to the technical scheme, the process is clear, required sensors are low in cost and easy to obtain, experiment working conditions are simple and easy to achieve, the proposed three-parameter extraction method is high in precision and stability, sprung mass parameters and suspension characteristic parameters of the experiment vehicle can be conveniently and rapidly obtained, and priori knowledge is provided for subsequent research on the driving smoothness and the handling stability of the experimental vehicle.

Description

technical field [0001] The invention belongs to the technical field of on-vehicle measurement, and in particular relates to a method for extracting three parameters of an electric vehicle mass, spring and damping model. Background technique [0002] For the estimation of automobile sprung mass and suspension characteristic parameters, researchers have proposed a variety of methods. CN201980079582.8 proposes a method for estimating cargo mass using a vertical accelerometer. This method calculates the loaded sprung mass through the ratio of the vertical vibration period of the vehicle body before and after cargo loading, but this method does not take into account the impact of shock absorber damping on vibration Impact. CN201610442383.7 proposes a vehicle load measurement method based on an acceleration sensor. This method uses the deflection of the leaf spring and its stiffness characteristic curve to carry out weighted calculations on each load to obtain the actual vehicle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007G01M17/04G01M7/02G01M5/00G06F30/17G06F30/20
CPCG01M17/007G01M17/04G01M7/025G01M5/00G06F30/17G06F30/20Y02T90/00
Inventor 程夕明韩禹飞吴文靖王震坡
Owner BEIJING INSTITUTE OF TECHNOLOGYGY