Patent ID: 8528522
Filing Date: 2013-09-10
Classification: F02D,F02M,Y02T

Abstract:
1. A method for pressure control of a common rail injection system of an internal combustion engine, comprising a high-pressure pump for delivering fuel to a common rail accumulator connected to an injector, a volume control valve (VCV) which is disposed upstream of the high-pressure pump and configured for adjusting a volume flow of fuel through said volume control valve into the high-pressure pump, and a pressure control valve (PCV) downstream of the high-pressure pump, the method comprising: using a processor to implement a VCV closed-loop control mode for controlling the pressure of fuel in the common rail injection system, wherein in the VCV closed-loop control mode the VCV is controlled in a closed-loop control manner and the PCV is controlled in an open-loop control manner; upon detecting a predefined operating point of the internal combustion engine, automatically activating a switch to activate a PCV closed-loop control mode while in the VCV closed-loop control mode, wherein both the PCV and the VCV are controlled in a closed-loop control manner; upon achieving a desired pressure control according to the PCV closed-loop control mode, automatically activating the switch to deactivate the PCV closed-loop control mode, thereby returning to the VCV closed-loop control mode, wherein the VCV is controlled in a closed-loop control manner and the PCV is controlled in an open-loop control manner.