Electric power assisted steering system

Motor vehicles – Compensating devices

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

180142, B62D 504

Patent

active

046243348

ABSTRACT:
An electrical power assisted steering system for a vehicle. The system includes a battery, having two terminals at different voltages and a center tap, and a bidirectional electric power assist motor having two terminals, one terminal being connected to the center tap of the battery. In an electric vehicle, said battery would be the traction battery. A control circuit responds to movement of the vehicle's steering wheel to generate a pulse width modulated (PWM) signal to drive the motor to assist in steering. The pulse widths are directly proportional to the driver's rotational displacement of the steering wheel and the amount of current flowing through the motor and inversely proportional to the speed of the vehicle. The PWM signal is applied to a selected one of two driving transistors, the first of which is connected between one of the terminals of the battery and the free terminal of the motor, the other of which is connected between the other terminal of the battery and the free terminal of the motor. Upon receipt of the PWM signal, the selected driving transistor connects the motor to its associated terminal of the battery to cause the motor to turn in a desired direction and deliver torque proportional to the width of the pulses. Also disclosed are monitoring circuits which monitor the operation of the control circuit and disconnect the motor from the battery when a malfunction is detected.

REFERENCES:
patent: 3054924 (1962-09-01), Wetzger et al.
patent: 3870935 (1975-03-01), Abels et al.
patent: 3884318 (1975-05-01), Abels et al.
patent: 4056160 (1977-11-01), Abels et al.
patent: 4173265 (1979-11-01), Kremer
patent: 4184333 (1980-01-01), Blaha et al.
patent: 4356732 (1982-11-01), Hachtel et al.
patent: 4509611 (1985-04-01), Kade et al.
patent: 4538698 (1985-09-01), Hashimoto et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Electric power assisted steering system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electric power assisted steering system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric power assisted steering system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1154103

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.