Patent ID: 9032935
Filing Date: 2015-05-19
Classification: F02D,F02M,F04B

Abstract:
1. Method for monitoring an electric motor configured to transfer mechanical power to a fuel pump, comprising: estimating a pump speed and a nominal pump motor current in relation to a pump motor control signal and a fuel pressure; estimating an armature resistance and a back-emf constant for the electric motor corresponding to the estimated pump speed, a monitored pump motor current, and the pump motor control signal; adjusting a nominal armature resistance and a nominal back-emf constant for the electric motor in relation to a pump motor temperature; determining a plurality of residuals based upon the adjusted nominal armature resistance, the adjusted nominal back-emf constant, the estimated armature resistance and the estimated back-emf constant; comparing the residuals with corresponding thresholds; and detecting a fault in the electric motor based upon the comparisons of the residuals with the corresponding thresholds.