Patent ID: 9261036
Filing Date: 2016-02-16
CPC Classification: F02D

Claim Text:
1. A method to minimize common rail pressure irregularities due to aliasing effect on battery voltage monitoring in a digital electronic control unit that is capable of PWM (Pulse Width Modulation) regulations of a metering valve unit in a diesel common-rail power-train system, wherein at least an engine rotary speed signal is detected and at least a battery voltage signal is monitored and input to a controller module in said digital electronic control unit for PWM regulating said metering valve unit of said diesel common-rail power-train system, the method comprising: calculating an aliasing frequency on said battery voltage signal as a function of said engine rotary speed signal; filtering said battery voltage signal before it is input to said controller module with at least one digital non-linear notch filter, the at least one digital non-linear notch filter is centered about a first harmonic of said aliasing frequency; and inputting the battery voltage signal with at least the engine rotary speed signal to the controller module of the digital electronic control unit for PWM regulating said metering valve unit.