Circuit/System Description

The power steering control module (PSCM) continuously monitors the voltage and current levels being commanded to the electric power steering (EPS) motor. A DC/DC converter is applied to the battery voltage input to the PSCM to boost the pulse width modulated (PWM) command circuit to drive the brushless, 3 phase motor. The PSCM compares the desired and actual current levels to detect malfunctions in the EPS motor, or the circuits to the motor.