Patent ID: 6581572
Filing Date: 2003-06-24
Classification: F02D

Abstract:
An electronic control unit (ECU) for controlling operation of an internal combustion engine over a range of operating conditions between low engine load operating conditions and high engine load operating conditions, the ECU programmed to:(a) provide for operation of said engine according to a fuel led control mode wherein fuelling rates for said engine are selected by said ECU as a function of operator demand and air flow to said engine is adjusted by said ECU according to said fuelling rate; (b) provide for operation of said engine according to an air led control mode wherein fuelling rates for said engine are selected by said ECU as a function air flow to the engine, said air flow adjusted in accordance with operator demand; (c) operate said engine in said fuel led mode during at least part of a low engine load portion of said range of operating conditions; (d) operate said engine in said air led mode during at least part of a medium to high engine load portion of said range of operating conditions; (e) provide at least one transition point between the two control modes such that at said transition point each control mode provides substantially the same predetermined fuelling rate.