Patent ID: 8775052

Claim:
Method for isolating an actual sensor bias in a fuel delivery system having a fuel pump comprising: monitoring a plurality of fuel pump parameters, comprising: monitoring a first fuel pump parameter comprising a pump current measured by a current sensor, monitoring a second fuel pump parameter comprising a pump pressure measured by a pressure sensor, and monitoring a third fuel pump parameter comprising a pump voltage; modeling a first fuel pump modeled parameter based on the monitored second fuel pump parameter and the monitored third fuel pump parameter, said modeled first fuel pump modeled parameter corresponding to a modeled pump current; modeling a second fuel pump modeled parameter based on the monitored first fuel pump parameter and the monitored third fuel pump parameter, said modeled second fuel pump modeled parameter corresponding to a modeled pump pressure; detecting first and second fuel pump sensor biases, comprising detecting the first fuel pump sensor bias based on a comparison between the first fuel pump parameter to the modeled first fuel pump modeled parameter, said detected first fuel pump sensor bias comprises a current sensor bias, and detecting the second fuel pump sensor bias based on a comparison between the modeled second fuel pump modeled parameter to the second fuel pump parameter, said detected second fuel pump sensor bias comprises a pressure sensor bias; modeling a fourth fuel pump modeled parameter based on the monitored second and third fuel pump parameters; and isolating the actual sensor bias in one of the detected first and second fuel pump biases based on the monitored third fuel pump parameter and the modeled fourth fuel pump modeled parameter.