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All commonly used speed sensitive power steering assist systems for cars are based on hydraulics. These systems [ILLEGIBLE]ange the pressure or modulate the flow of the conventional [ILLEGIBLE]draulic power steering system. They require some means of [ILLEGIBLE]ctuation in the form of an electromagnetic device such as a solenoid actuator working as a flow pressure regulator or brushless motor driving a hydraulic pump. Usually they are pulse width modulated controlled by a microprocessor. Therefore, these systems can be quite complicated. This paper describes MAGNASTEER a novel magnetic speed sensitive system developed at General Motors Corporation. The effort variation provided by MAGNASTEER is the result of an electronically controlled electromagnetic torque, which acts as an addition or subtraction to the torsion bar torsional rate, effectively varying the feel of the hydraulic system.

All commonly used speed sensitive power steering assist systems for cars are based on hydraulics. These systems change the pressure or modulate the flow of the conventional hydraulic power steering system. They require some means of actuation in the form of an electromagnetic device such as a solenoid actuator working as a flow or pressure regulator or brushless motor driving a hydraulic pump. Usually they are pulse width modulated controlled by a microprocessor. Therefore, these systems can be quite complicated. This paper describes MAGNASTEER, a novel magnetic speed sensitive system developed at Saginaw Division in cooperation with the NAO Research and Development Center, which is an add on to the basic hydraulic power steering system. The effort variation provided by MAGNASTEER is the result of an electronically controlled electromagnetic torque, which acts as an addition or subtraction to the torsion bar torsional rate, effectively varying the feel of the hydraulic system.