Electric power steering device

Details Electric power steering device Electric power steering device

Filed on

2008-07-22

Date issued

2008-07-22

Examiner

Leykin, Rita (Department: 2837)

Patent Class

Electricity: motive power systems

SubClass

Constant motor current, load and/or torque control

Other Related Categories

C318S434000, C318S433000, C323S274000, C323S284000, C180S446000, C701S041000, C701S042000

Type

Reexamination Certificate

Status

active

Patent number

11508302

Description

ABSTRACT:
The present invention includes a control part for controlling switching elements on diagonal lines in the upper and lower stage of an H bridge circuit respectively by different duty ratios based on a steering torque exerted on a steering system, and an electric power supply source for supplying an electric power. When the voltage of the electric power supply source is lower than a prescribed voltage, the control part causes the switching element EET1or FET2on the upper-stage side to be driven by a pulse width modulation signal PWM1or PWM2, the switching element FET4or FET3on the lower-stage side to be turned on, and the frequency of the pulse width modulation signal to be lowered to an audible frequency range.

REFERENCES:
patent: 5740040 (1998-04-01), Kifuku et al.
patent: 6502024 (2002-12-01), Ishihara et al.
patent: 6727669 (2004-04-01), Suzuki et al.
patent: 8-337172 (1996-12-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3926514