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New ECPS
 
Korean
 
When there is a fast driving, the existing Power Steering (PS) has a disadvantage which is that a steering stability is worse. The Electronically controlled Power Steering (ECPS) compensates this disadvantage. But, as the existing ECPS has a complicated structure and is expensive, a small number of high-class car has the ECPS in the domestic market. This research is that the new ECPS system having a simple structure is developed using the brake. This brake is composed of the Magneto-Rheological Fluid (MR Fluid) which is a controllable fluid. The ability of the new ECPS is that we can improve the steering stability as the new ECPS can behave like the PS when there is a slow driving or a parking and can offer a high steering power to a driver when there is a high driving. Furthermore, when there is a high driving if we judge that there is an avoidance situation, We can eliminate a high steering power in a desired time.

Schematic


Damper for ECPS by MRF

- The entire size is 100mm considering installation.
- Total dissipation of torque is about 11~12KNm on 1A.
Experiments

The experimental system is made in order to realize steering condition for MR damper like next figure. The Motor takes the place of an operator's steering input. The whole experimental system is made in order to estimate the vehicle test standards, appraisal standards, and so on.
Experiment Results

The simulations are set up through making an investigation into the control standard with respect to the change of angular velocity about the steering wheel and velocity about the vehicle. And the results are attained assuming the signal of angular velocity about the steering wheel and velocity about the vehicle for the performance appraisal. PID technique is used for the control.



Like the upper figure the signal is estimated well with respect to the change of velocity about the vehicle. But it is not estimated with respect to the change of angular velocity about the steering wheel because of the response of the damper. The study has been progressed for the enhanced response at present.