Patent ID: 7437234
Filing Date: 2008-10-14
Classification: F02D,Y02T

Abstract:
1. A control system for controlling an injector of a cylinder in a combustion engine where the injector is connected to a fuel accumulator of a common-rail fuel injection system, the control system comprising: a data storage medium having stored thereon an on-time calculation model or a lookup table and a fuel quantity calculation model or a lookup table; and an engine control device operable to establish an on-time value (t) for the injector with the aid of the on-time calculation model or the lookup table based on a fuel pressure value (P) and a fuel injection quantity value (δ), wherein the fuel pressure value (P) represents the fuel pressure in the fuel accumulator, the fuel injection quantity value (δ) represents a desired quantity of fuel to be injected into the cylinder and the on-time value (t) represents the associated on-time for the injector, the engine control device comprises a processor operable to execute the following steps: A) interrupt the supply of fuel to the fuel accumulator; B) execute a test injection of fuel into the cylinder with the injector by applying an on-time value (t C) determine or receive a pressure drop value (ΔP) representing the pressure drop of the fuel in the fuel accumulator during the test injection and a fuel pressure value (P D) establish the actual fuel quantity (δ E) compare the actual fuel quantity (δ F) adjust the on-time calculation model or the lookup table in dependence on the result of the comparison.