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US 6,161,068 AGranted
Electric power steering control system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMasahiko Kurishige, Noriyuki Inoue, Takayuki Kifuku, Susumu Zeniya
Life of this patent
Estimating the term…
Abstract
An electric power steering control system reducing steering torque without making a driver feel uncomfortable torque oscillation, including a rotation speed observer for estimating the rotation speed of a motor based on the output of a torque sensor high pass filter (HPF) and the output of a drive current HPF obtained by removing a steering frequency component from a drive current detection value.
Claims9
An electric power steering control system comprising:
- steering torque detection means for detecting a steering torque of a driver;
- a motor for generating a torque for assisting the steering torque;
- rotation speed detecting means for obtaining a rotation speed of a motor;
- and
- steering component removing means for removing a steering speed component from the rotation speed of the motor, the steering component removing means comprising a frequency separator for removing a steering frequency component from the rotation speed of the motor.
2 more elements
An electrical power steering control system comprising:
- steering torque detection means for detecting a steering torque of a driver;
- a motor for generating a torque for assisting the steering torque;
- rotation speed detection means for obtaining a rotation speed of the motor, the rotation speed detecting means comprising a rotation speed estimation unit for estimating a reverse voltage of the motor by subtracting a coil voltage drop equivalent of the motor from a motor inter-terminal voltage and computing a motor rotation speed estimation value based on the estimated reverse voltage, wherein the coil voltage drop equivalent is dependent on motor current;
- and
- steering component removing means for removing a steering speed component from the rotation speed of the motor.
2 more elements
An electric power steering control system comprising:
- steering torque detection means for detecting a steering torque of a driver;
- a motor for generating a torque for assisting the steering torque;
- rotation speed detection means for obtaining a rotation speed of the motor;
- and
- first steering component removing means for removing a steering speed component from the rotation speed of the motor, the rotation speed detection means comprising:
- second steering component removing means for removing a steering component from a motor rotation angle detection value;
- third steering component removing means for removing a steering component from a current applied to the motor;
- and
- a rotation speed observer for computing a motor rotation speed estimation value based on a motor rotation angle and a motor current output from the second and third steering component removing means, considering an inertia moment of the motor and rigidity of a torque sensor.
6 more elements
An electric power steering control system comprising:
- steering torque detection means for detecting a steering torque of a driver;
- a motor for generating a torque for assisting the steering torque;
- rotation speed detection means for obtaining a rotation speed of the motor;
- and
- first steering component removing means for removing a steering speed component from the rotation speed of the motor, the rotation speed detection means comprising:
- second steering component removing means for removing a steering component from a current applied to the motor;
- third steering component removing means for removing a steering component from an output of the steering torque detection means;
- and
- a rotation speed observer for computing a motor rotation speed estimation value based on a motor current output and steering torque output from the second and third steering component removing means, considering an inertia moment of the motor and rigidity of a torque sensor.
6 more elements
An electric power steering control system comprising:
- steering torque detection means for detecting a steering torque of a driver;
- a motor for generating a torque for assisting the steering torque;
- rotation speed detecting means for obtaining a rotation speed of a motor;
- steering component removing means for removing a steering speed component from the rotation speed of the motor;
- and
- car speed detection means for changing a frequency range to be removed by the steering component removing means according to car speed.
3 more elements
Dependencies are inferred from the claim text.