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Design method for optimal control current of vehicle seat suspension magnetorheological damper

A magnetorheological shock absorber and optimal control technology, applied to seat suspension devices and other directions, can solve problems such as misoperation, lack of optimal control current for seat magnetorheological shock absorbers, and high real-time requirements.

Inactive Publication Date: 2014-12-03
SHANDONG UNIV OF TECH
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Problems solved by technology

This kind of control law is relatively simple, but it has high requirements for real-time performance and requires high-cost hardware; however, no matter how the hardware is designed, the signal acquisition and control system always has time-lag problems, which can easily lead to misoperation of "switch" control , which deteriorates the damping performance of the mount
In the second method, because the road excitation based on the design may be different from the actual driving conditions of the vehicle, the control effect of the damping control law is not ideal; moreover, this method has high requirements for real-time performance and requires high-cost hardware.
Therefore, for the equivalent optimal damping and control current of the magneto-rheological shock absorber mounted on the vehicle seat, there is still a lack of a control law that is ideal for vehicle control in actual road conditions and requires less hardware equipment. Design method of optimal control current for magneto-rheological shock absorber

Method used

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  • Design method for optimal control current of vehicle seat suspension magnetorheological damper
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  • Design method for optimal control current of vehicle seat suspension magnetorheological damper

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Embodiment Construction

[0044] The present invention will be further described in detail through an embodiment below.

[0045] The seat mount system of a heavy-duty truck uses magneto-rheological shock absorbers, and it is necessary to optimize the control law of the equivalent damping of the seat mount magneto-rheological shock absorbers to meet the comfort requirements. In the truck seat system, the equivalent stiffness K of the seat cushion is known h =2900N / m and equivalent damping C h =612Nm / s; Equivalent stiffness of human body K b =25012N / m and equivalent damping C b =720Nm / s; the equivalent mass of the upper part of the human body m b = 50kg and the equivalent mass of human buttocks m h = 15kg, the sum of the mass of the seat and cushion m s = 20 kg. 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, the length of the piston L=40mm; the magne...

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Abstract

The invention relates to a design method for optimal control current of a vehicle seat suspension magnetorheological damper, and belongs to the technical field of vehicle seats. The design method is characterized in that seat suspension equivalent stiffness Ks is obtained by the aid of a parameter retrieving target function according to measured vibration acceleration signals and relative speeds of a seat mounting floor and a seat surface of an actual running vehicle, a seat human system simulink model and a seat suspension damping Cs design target function are re-built by the aid of the retrieved seat suspension equivalent stiffness, equivalent optimal damping Cs-o is designed by the aid of optimization algorithm, and the optimal control current of the magnetorheological damper is designed by the aid of the relationship between damping force and control current. The control current is obtained according to the actual vehicle running condition, so that the control current is more reliable, and comfort of the seats is remarkably improved. Besides, an expensive hardware device is not needed by the aid of an optimal current control rule table, so that cost is reduced.

Description

technical field [0001] The invention relates to a vehicle seat, in particular to a design method for an optimal control current of a magneto-rheological shock absorber mounted on a vehicle seat. Background technique [0002] Seat system comfort is one of the important indicators for evaluating vehicle performance. Magneto-rheological shock absorbers have been used in vehicle seat suspension systems in recent years because they are easy to adjust. In order to improve the comfort of the vehicle seat system, it is necessary to optimize the control law of the equivalent damping of the vehicle seat mount magneto-rheological shock absorber. At present, the control law of the equivalent damping of the magneto-rheological shock absorber in the practical application of the vehicle seat suspension mainly consists of two design methods: the first is the ceiling damping control law and its improved control law; the second is the The method is mainly based on the road roughness level p...

Claims

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Application Information

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IPC IPC(8): B60N2/50
Inventor 周长城李红艳郭剑提艳宋群程正午
Owner SHANDONG UNIV OF TECH
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