Patent ID: 7647919
Filing Date: 2010-01-19
Classification: F02D

Abstract:
1. A fuel injection control for an internal combustion engine having a plurality of combustion chambers with at least one electric solenoid activated fuel injector for direct injection of fuel into each of the combustion chambers in one or more fuel injection pulses for each combustion event, the fuel injection control comprising: a first controller comprising a microprocessor configured to generate injection pulse signals on injector select lines, each of the injector select lines identifying a predetermined one of the fuel injectors and each of the injection pulse signals defining the timing and duration of a fuel injection pulse, the first controller further comprising a memory adapted to store a plurality of sets of injector current profile defining parameters for fuel injection pulses; a serial communication bus; a second controller connected to the microprocessor of the first controller via the injector select lines and the communication bus, the second controller comprising a plurality of injector control circuits for activating individual fuel injectors in fuel injection pulses as indicated by the injector select lines and at the times and for the durations indicated by the injection pulse signals thereon, the second controller further having a plurality of register sets connected to the communication bus and adapted to receive thereby sets of injector current profile defining parameters communicated to them by the microprocessor of the first controller; and the second controller further comprising switching apparatus for selectively connecting each of the injector control circuits to alternative ones of the plurality of register sets responsive to register select signals, wherein the electric current in each fuel injection pulse of each of the fuel injectors is controlled by one of the injector control circuits in accordance with the set of injector current profile defining parameters held by the one of the register sets to which it is connected by the switching apparatus.