A study on the improvement of the load pressure feedback mechanism of the proportional pressure control valve

The proportional pressure control valve having versatile functions and high er performance is an essential component in the open loop controlled rear w heel steering gear of the four wheel steering system on a passenger car. In this study, the authors suggest a new type of load pressure feedback mecha nism which can make it easy to change the control range of load pressure wi thout changing the capacity of solenoid. The concept of the suggested mecha nism, composed of the pressure chamber with throttles in series, was descri bed. The mathematical model was derived from the rear wheel steering gear s ystem consisting of a valve and a cylinder for the purpose of analyzing the valve characteristics; And the programme for computing the characteristic of the valve was developed. Experiments were carried out to confirm the per formance of the valve and computations were performed to ascertain the usef ulness of the developed programme. The results from the computations fairly coincide with those from the experiments. The results from the experiments and computations show that the performance of new valve is as good as that of the already developed one and the new valve has an advantage in the eas iness in varying the control range of load pressure.