Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2005-12-13

2005-12-13

Luby, Matthew (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C701S042000, C318S293000

Reexamination Certificate

active

06973992

ABSTRACT:
An elect power steering apparatus includes a motor drive circuit for PWM-driving an electric motor to generate a steering assist torque corresponding to a steering torque. The motor drive circuit includes a bridge circuit formed by a plurality of FETs, and a predrive circuit for driving FETs at a positive potential. Series connected first and second voltage step-up circuits for stepping up a line voltage at two stages are provided in front of the predrive circuit so that the FETs are driven by the predrive circuit with an output voltage from the second voltage step-up circuit supplied to the predrive circuit.

REFERENCES:
patent: 4719396 (1988-01-01), Shimizu
patent: 4875539 (1989-10-01), Abukawa et al.
patent: 6691818 (2004-02-01), Endo et al.
patent: 6885225 (2005-04-01), Ohmichi et al.
patent: 2003/0156439 (2003-08-01), Ohmichi et al.
patent: 2864474 (1998-12-01), None

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