Patent ID: 6257194
Filing Date: 2001-07-10
Classification: F01L,F02B,F02D,Y02T

Abstract:
A method for ceasing operation of an internal combustion engine, the engine having a throttle valve and a plurality of cylinders, each of the cylinders having a spark plug, electronically deactivatable intake and exhaust valves, and an adjoining intake port having a fuel injector disposed therein, the method comprising the steps of:sensing a demand for cessation of engine operation;determining, for one of more of the cylinders, whether the fuel injector has injected fuel since the occurrence of a corresponding and immediately prior combustion event; andperforming a trapping intake event, for the one or more o f the cylinders, to trap unburned exhaust gases within the one or more cylinders if it is determined, pursuant to said determining step, that fuel has not been injected since the occurrence of the corresponding and immediately prior combustion event.