Electric power steering apparatus
First Claim
Patent Images
1. An electric power steering apparatus comprising:
- an electric motor for assisting steering force;
a torque sensor detecting a steering torque and producing a steering torque signal representative thereof;
a broken line function circuit outputting an analog signal of a value corresponding to a broken line function based on the steering torque signal from the torque sensor;
a target value generator producing a target value of motor current for driving the motor on the basis of said analog signal;
a vehicle speed sensor producing a pulse signal representing detected vehicle speed;
a digital vehicle speed--broken point characteristic processor determining a value of the steering torque signal corresponding to a broken point of the broken line function on the basis of the pulse signal from the vehicle speed sensor, and outputting a PWM signal corresponding to the determined steering torque signal value; and
an analog broken point voltage control circuit converting said PWM signal outputted from said vehicle speed--broken point characteristic processor into an analog signal, and outputting said analog signal to said broken line function circuit as a broken point determining signal,wherein said broken line function circuit determines the broken line function in accordance with the broken point determining signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An electric power steering apparatus comprises broken point characteristics determining means for determining a value of a steering torque signal corresponding to a broken point of a broken line function on the basis of a vehicle speed signal from a vehicle speed sensor, a broken line function circuit for determining the broken line function in accordance with the broken point determining signal determined by the broken point characteristics determining means and outputting an analog signal corresponding to the broken line function, and means for determining a target value of a motor current to drive an electric motor for assisting steering on the basis of the analog signal.
76 Citations
3 Claims
-
1. An electric power steering apparatus comprising:
-
an electric motor for assisting steering force; a torque sensor detecting a steering torque and producing a steering torque signal representative thereof; a broken line function circuit outputting an analog signal of a value corresponding to a broken line function based on the steering torque signal from the torque sensor; a target value generator producing a target value of motor current for driving the motor on the basis of said analog signal; a vehicle speed sensor producing a pulse signal representing detected vehicle speed; a digital vehicle speed--broken point characteristic processor determining a value of the steering torque signal corresponding to a broken point of the broken line function on the basis of the pulse signal from the vehicle speed sensor, and outputting a PWM signal corresponding to the determined steering torque signal value; and an analog broken point voltage control circuit converting said PWM signal outputted from said vehicle speed--broken point characteristic processor into an analog signal, and outputting said analog signal to said broken line function circuit as a broken point determining signal, wherein said broken line function circuit determines the broken line function in accordance with the broken point determining signal. - View Dependent Claims (2, 3)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeKoyo Seiko Co., Ltd. (Toyota Motor Corporation)
-
Original AssigneeKoyo Seiko Co., Ltd. (Toyota Motor Corporation)
-
InventorsFukuda, Ken, Noritou, Yasuji, Matsuoka, Hirofumi
-
Primary Examiner(s)Cuchlinski, Jr., William A.
-
Assistant Examiner(s)ARTHUR JEANGLAUDE, GERTRUDE
-
Application NumberUS08/816,750Time in Patent Office883 DaysField of Search701/22, 701/41, 701/43, 701/42, 180/197, 180/412, 180/415, 180/422, 180/443, 180/446US Class Current701/41CPC Class CodesB62D 5/0487 detecting motor faults B62D...
