Patent ID: 9046052
Filing Date: 2015-06-02
Classification: F02D

Abstract:
1. A method for controlling a fuel pressure in a fuel supply device of an internal combustion engine having a regulator valve, the method comprising the steps of: determining a desired fuel pressure value; determining an actual fuel pressure value by a fuel pressure sensor; calculating an actual fuel pressure gradient from at least two consecutive actual fuel pressure values from said fuel pressure sensor, wherein the actual fuel pressure gradient represents the first derivative of the actual fuel pressure; comparing the calculated actual fuel pressure gradient representing the first derivative of the actual fuel pressure to a specified threshold gradient value; and if the calculated actual fuel pressure gradient is positive indicating a rise in fuel pressure, and the absolute value of the calculated actual fuel pressure gradient is above the specified threshold gradient value, then decreasing a magnitude of an actuating signal based on the desired fuel pressure value and the calculated positive actual fuel pressure gradient; if the calculated actual fuel pressure gradient is negative indicating a drop in fuel pressure, and the absolute value of the calculated actual fuel pressure gradient is above the specified threshold gradient value, then increasing the magnitude of the actuating signal based on the desired fuel pressure value and the calculated negative actual fuel pressure gradient; if the absolute value of the calculated actual fuel pressure gradient is below the specified threshold gradient value, increasing or decreasing the actuating signal based on the desired fuel pressure value but not the calculated actual fuel pressure gradient; and controlling said regulator valve with said decreased or increased actuating signal; wherein the desired fuel pressure value represents a fuel pressure, in contrast to the calculated actual fuel pressure gradient, which represents a change in fuel pressure over time.