Motor control in vehicle power steering system
First Claim
1. Vehicle power steering system, comprising:
- an electric motor; and
an electronic control system configured to effect control of the electric motor dynamically, such that the electric motor generates a motor torque in addition to a steering torque exerted by the driver of the vehicle which supports the steering force, said control system being further configured to effect evaluation of the rotor rpm of the electric motor and, if a periodic fluctuation of the rotor rpm is detected by the evaluation, the control system being additionally configured to responsively effect an increase in the dynamic response time of the rotor.
2 Assignments
0 Petitions
Accused Products
Abstract
A vehicle power steering system suppresses chattering, i.e., unpleasant noises in the form of mechanical and generally higher frequency oscillations resulting from backlash in a gear connection transmitting the torque from the motor to the steering wheel mechanics, produced under certain driving conditions. A control system is provided which evaluates the rotor rpm of the electric motor, and increases the dynamic response time of the rotor in the event that the evaluation of the rotor rpm indicates an unstable state of the control system. As a result, chattering is suppressed only when a critical driving situation arises in which the control system becomes unstable, while, in the normal state, the steering system exhibits all properties thereof, and is neither delayed nor limited in a dynamic behavior thereof.
9 Citations
9 Claims
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1. Vehicle power steering system, comprising:
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an electric motor; and an electronic control system configured to effect control of the electric motor dynamically, such that the electric motor generates a motor torque in addition to a steering torque exerted by the driver of the vehicle which supports the steering force, said control system being further configured to effect evaluation of the rotor rpm of the electric motor and, if a periodic fluctuation of the rotor rpm is detected by the evaluation, the control system being additionally configured to responsively effect an increase in the dynamic response time of the rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification