The Digital Engine Concept

In most conventional engines the fuel supply system attempts to distribute equal amounts of fuel to each cylinder in any quantity between idle and maximum. The digital engine concept is an alternative fuel management system in which the fuel is delivered to the combustion chambers in quantums. This is accomplished by having multiple digital fuel injectors in each combustion chamber. Each injector when activated delivers a fixed amount of fuel or when deactivated it delivers none. The fuel delivery level is established by the selection of injectors which are activated. The most appropriate configuration for a digital engine is a two stroke loop scavenged stratified charge two stroke engine. The strategy for controlling the fuel delivery and the expected benefits of a digital engine are discussed.