Patent ID: 8473147
Filing Date: 2013-06-25
Classification: F02D,F02M

Abstract:
1. A method for determining a numeric state of health (SOH) value for a fuel delivery system in a vehicle, the method comprising: estimating a speed of a calibrated fuel pump using an extended state observer and a set of nominal parameters for the calibrated fuel pump, including deriving, via a controller, a canonical state space model using the set of nominal parameters; estimating a speed of an actual fuel pump used in the fuel delivery system of the vehicle using the extended state observer and a set of measured parameters for the actual fuel pump, wherein the nominal parameters and the measured parameters each include a resistance, a back electromotive force (EMF), and an inductance of the calibrated and the actual fuel pumps, respectively; calculating a deviation between the estimated speeds of the calibrated fuel pump and the actual fuel pump; determining the progress of the deviation over a calibrated interval; calculating the numeric SOH value of the fuel delivery system, wherein the numeric SOH value numerically represents the progress of the deviation over the calibrated interval; and automatically executing a control action with respect to the fuel delivery system in a manner corresponding to the SOH value.