Stabilization of the vertical reactions of the road on the wheel when driving automobile on periodic profile

Abstract

For various reasons roads could be in not very good condition. In particular, at the roads could appear the areas with clearly defined periodic profile. The traffic on such road sections may be accompanied by resonance oscillations of the wheels with their separation from the road. This causes a decrease in stability of the vehicle. To combat this phenomenon the new system of active safety of the cat could be applied - stabilization system of the vertical reactions of the road on the wheel when driving on a periodic profile. Such a system to control the vertical reaction uses an execution unit called the actuator. This is the engine in the form of a hydraulic cylinder or linear motor that is included in suspension in the parallel elastic element and shock absorber. The actuator is controlled by a signal generated by the control unit, which receives a signal from the sensor of vertical force that is perceived by a bus or a signal to replace it. The article shows that the linear control system copes with the elimination of separation of wheel from the road, reducing fluctuations in the value of the vertical reaction to 10% of the static load. In the hydraulic control system vertical reaction of road on the wheel may cause the nonlinear relationship of the values of vertical reaction and the force generated by a hydraulic cylinder. The calculations showed the feasibility of stabilizing the vertical reactions in this case. However, this nonlinearity can cause some instability of vibrations of a vertical reaction. Another promising solution to the design of the hydraulic system of stabilization of the vertical reaction to the preservation of its sufficient efficiency is the use of hydraulic cylinders of unilateral action, which simplifies the system and makes it more available for use, even on compact automobiles.

Keywords

stability of vehicle motion / automated suspension system of vehicle / nonlinear control system

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RIGHTS & PERMISSIONS

Ryazantsev V.I., Balsam A.