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Control algorithm of automotive magneto-rheological semi-active suspension system and real-time optimal current

A semi-active suspension, magnetorheological technology, applied in the direction of suspension, elastic suspension, vehicle parts, etc., can solve problems such as failure to give

Inactive Publication Date: 2013-08-14
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many vehicle suspension research experts at home and abroad have done a lot of research on the magneto-rheological semi-active suspension of automobiles, due to the constraints of the real-time optimal damping ratio of the semi-active suspension system and the identification of the current driving road conditions of the vehicle, it has not been possible to give a comprehensive analysis of the current driving conditions of the vehicle. The real-time optimal current control algorithm of automotive magneto-rheological semi-active suspension under different driving conditions can be seen from the research data. The research on the strategy and control method, for the current control law of the magneto-rheological shock absorber of the semi-active suspension of the automobile, is mostly obtained through test fitting.

Method used

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  • Control algorithm of automotive magneto-rheological semi-active suspension system and real-time optimal current
  • Control algorithm of automotive magneto-rheological semi-active suspension system and real-time optimal current

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: The sprung mass of a certain automobile single-wheel suspension m 2 =300kg, suspension stiffness k 2 =13057N / m, unsprung mass m 1 =40kg, tire stiffness k t =192000N / m; the inner diameter of the piston cylinder of the magneto-rheological shock absorber is D H =28mm, piston rod diameter d g =18mm, the annular gap between the piston and the inner cylinder h =1.0mm, piston length L =40mm; Suspension leverage ratio i= 0.9 and shock absorber installation angle =10°; the initial viscosity of the magnetorheological fluid is 0.8Pa.s when no external magnetic field is applied, and the magneto-induced shear stress coefficient of the magnetorheological fluid =0.0015, the magnetic field strength index of the magnetic shear stress =1.6; Suspension dynamic deflection limit travel [ f d ]=0.1m. Measured body movement speed u 2 =0.2m / s, wheel movement speed u 1 =-0.1m / s, vehicle speed v =40km / h, body vibration acceleration =1.5m / s 2 , the curren...

Embodiment 2

[0064] Embodiment 2: The vehicle is the same as Embodiment 1, that is, vehicle parameters, suspension parameters, suspension dynamic deflection limit stroke, structural parameters of the magnetorheological shock absorber, characteristic parameters of the magnetorheological fluid, and number of turns of the electromagnetic coil. Exactly the same as that of embodiment one; Just the vehicle speed recorded in the running process v , Body vibration acceleration , the speed of the body moving up and down u 2 , the speed of the wheel moving up and down u 1 , and the current current of the magneto-rheological damper electromagnetic coil I ’ is different from that of Embodiment 1; wherein, the measured vehicle body motion speed u 2 =0.35m / s, wheel movement speed u 1 =0.1m / s, vehicle speed v =60km / h, body vibration acceleration =2.0m / s 2 , the current magneto-rheological damper electromagnetic coil current I’ =0.45A. The current driving condition of the car Identify and...

Embodiment 3

[0093] Embodiment three: a semi-active suspension system of a certain automobile, except that the sprung mass and suspension stiffness are different from those in embodiment one, other parameters and the signals measured during driving are all identical to those in embodiment one; The single wheel sprung mass of the car m 2 =400kg, suspension stiffness k 2 = 20884N / m; the current driving condition of the car Identify and optimally control the current of the magneto-rheological shock absorber electromagnetic coil under the current driving conditions in real time I Calculation.

[0094] Using the design steps of Embodiment 1, the magneto-rheological shock absorber electromagnetic coil control current I Do the calculation, that is:

[0095] (1) The current damping coefficient of the semi-active suspension system of the vehicle and damping ratio ξ' The real-time simulation calculation of:

[0096] According to the structural parameters of the shock absorber of the auto...

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Abstract

The invention relates to a control algorithm of an automotive magneto-rheological semi-active suspension system and real-time optimal current, and belongs to the technical field of dampers. The control algorithm is characterized by comprising the steps that damping characteristics of a magneto-rheological damper and the semi-active suspension system are simulated according to the currently measured current; the current running road condition of an automobile is identified according to the running speed and the vibration acceleration of an automobile body; a real-time optimal damping ratio of the semi-active suspension system and an optimal Coulomb damping force of the magneto-rheological damper are determined according to the current running road condition, and speed and suspension parameters; and the real-time optimal control current of the automotive magneto-rheological semi-active suspension under the current running working condition is calculated according to relations among the Coulomb damping force, a structure parameter, a magneto-rheological liquid characteristic parameter, the turn number of an electromagnetic coil and the current. According to the control algorithm, a design level and the performances of the magneto-rheological semi-active suspension system can be raised and improved; design and testing expenses are lowered; and the running smoothness and the safety of the automobile are improved.

Description

technical field [0001] The invention relates to a magneto-rheological semi-active suspension system, in particular to an automobile magneto-rheological semi-active suspension system and a real-time optimal current control algorithm. Background technique [0002] The magneto-rheological shock absorber can control the damping force by controlling the magnitude of the current. It has the characteristics of fast response, low power consumption, large adjustment range, etc., and the working conditions are relatively simple. It has become the current domestic and foreign vehicle semi-active A hot spot in the field of suspension research. Solenoid current I The size of the MR shock absorber determines the damping characteristics of the magneto-rheological shock absorber and the damping matching of the semi-active suspension system, which has an important impact on the ride comfort of the car. Although many vehicle suspension research experts at home and abroad have done a lot of ...

Claims

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Application Information

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IPC IPC(8): B60G17/015B60G17/06
Inventor 周长城李红艳汪晓
Owner SHANDONG UNIV OF TECH
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