ELECTRIC POWER STEERING CONTROL SYSTEM
First Claim
1. An electric power steering control system for a vehicle, the vehicle having a steering device coupled by a steering assembly to at least one tire steered by the steering device, the control system controlling a current in a motor for generating torque applied to the steering assembly, and the control system comprising:
- means for generating a torque target signal representative of the torque applied by the motor to the steering assembly, the torque target signal being a multiplication of a steering torque from the steering device;
means for sensing the motor current and providing a motor current signal; and
means for controlling the motor receiving the torque target signal and the sensed motor signal, whereby the motor current signal is driven towards a value wherein the torque target signal is equal to a multiplication factor of the motor current signal.
3 Assignments
0 Petitions
Accused Products
Abstract
An electric power steering control system for a vehicle that has a steering device coupled by a steering assembly to at least one tire steered by the steering device. The control system controls a current in a motor for generating torque applied to the steering assembly. The control system comprises a feed-forward component that generates a torque target signal representative of the torque applied by the motor to the steering assembly. The torque target signal is proportional to a multiplication of a steering torque from the steering device. There is also a sensor component that senses the motor current and provides a motor current signal. A motor control component receives the torque target signal and the sensed motor signal. The motor current signal is driven towards a value wherein the torque target signal is equal to a multiplication factor of the motor current signal.
36 Citations
26 Claims
-
1. An electric power steering control system for a vehicle, the vehicle having a steering device coupled by a steering assembly to at least one tire steered by the steering device, the control system controlling a current in a motor for generating torque applied to the steering assembly, and the control system comprising:
-
means for generating a torque target signal representative of the torque applied by the motor to the steering assembly, the torque target signal being a multiplication of a steering torque from the steering device; means for sensing the motor current and providing a motor current signal; and means for controlling the motor receiving the torque target signal and the sensed motor signal, whereby the motor current signal is driven towards a value wherein the torque target signal is equal to a multiplication factor of the motor current signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 23, 24)
-
-
12. An electric power steering control system for a vehicle having a steering device coupled by a steering assembly to at least one tire steered by the handle bar, the control system controlling a motor for generating torque applied to the steering assembly, the control system comprising:
-
a steering torque sensor for sensing steering torque generated by a driver of the steering device, the steering torque sensor providing a steering torque signal; a vehicle speed sensor providing a vehicle speed signal representative of the vehicle speed; a steering shaft angle sensor sensing the angular displacement of the steering device and providing a steering shaft angle signal; a feed forward component generating an assist torque target signal representative of the torque applied to the steering assembly, the feed forward component receiving the steering torque signal, the vehicle speed signal and the steering shaft angle signal; a current sensor for sensing the current in the motor and providing a motor current signal; means for controlling the motor whereby the torque applied to the steering assembly is proportional to a multiplication factor of the assist torque target signal, the means for controlling the motor receiving the assist torque target signal and the motor current signal, and providing a motor control signal.
-
-
13. A method of controlling an electric power steering system for a vehicle during the return to center phase of a steering assembly of the vehicle, the electric power steering system controlling a current in a motor for generating torque applied to the steering assembly, the method comprising the steps of:
-
generating a torque target signal representative of the torque applied by the motor to the steering assembly, the torque target signal being proportional to a multiplication of a steering torque from the steering device; sensing the motor current of the motor and providing a motor current signal; and controlling the motor, whereby the motor current is driven towards a value wherein the torque target signal is equal to a multiplication factor of the motor current signal.
-
-
14. An electric power steering control system for a vehicle, the vehicle having a steering device coupled by a steering assembly to at least one tire steered by the steering device, the control system controlling a current in a motor for generating torque applied to the steering assembly, and the control system comprising:
-
a first component for generating a torque target signal representative of the torque applied by the motor to the steering assembly, the torque target signal being a multiplication of a steering torque from the steering device; a motor current sensor for sensing the motor current and providing a motor current signal; and a second component for controlling the motor, the second component receiving the torque target signal and the sensed motor signal, whereby the motor current signal is driven towards a value wherein the torque target signal is equal to a multiplication factor of the motor current signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
-
-
25. An electric power steering control system for a vehicle having a steering device coupled by a steering assembly to at least one tire steered by the handle bar, the control system controlling a motor for generating torque applied to the steering assembly, the control system comprising:
-
a steering torque sensor for sensing steering torque generated by a driver of the steering device, the steering torque sensor providing a steering torque signal; a vehicle speed sensor providing a vehicle speed signal representative of the vehicle speed; a steering shaft angle sensor sensing the angular displacement of the steering device and providing a steering shaft angle signal; a feed forward component generating an assist torque target signal representative of the torque applied to the steering assembly, the feed forward component receiving the steering torque signal, the vehicle speed signal and the steering shaft angle signal; a current sensor for sensing the current in the motor and providing a motor current signal; means for controlling the motor whereby the torque applied to the steering assembly is proportional to a multiplication factor of the assist torque target signal, the means for controlling the motor receiving the assist torque target signal and the motor current signal, and providing a motor control signal.
-
-
26. A method of controlling an electric power steering system for a vehicle during the return to center phase of a steering assembly of the vehicle, the electric power steering system controlling a current in a motor for generating torque applied to the steering assembly, the method comprising the steps of:
-
generating a torque target signal representative of the torque applied by the motor to the steering assembly, the torque target signal being proportional to a multiplication of a steering torque from the steering device; sensing the motor current of the motor and providing a motor current signal; and controlling the motor, whereby the motor current is driven towards a value wherein the torque target signal is equal to a multiplication factor of the motor current signal.
-
Specification