System and method for controlling the supply of gaseous fuel in bi-fuel engines.

摘要

A system and a method for controlling the supply of gaseous fuel in a bi-fuel port-injection spark-ignition internal combustion engine are disclosed. The system comprises a bases ECU receiving signals indievative (sl)of engine operating staus from sensors, and generating a signal indicative of a gasoline injection time (SIGIT) to a secondary ECU and a gasoline injector; and a secondary ECU which receives an SI of a gaseous-fuel pressure in a storage tank, engine operating status from sensors and the (SIGFIT) to a gaseous fuel injector. The system is characterized in the secondary ECU is programmed to perform a control of the supply of gaseous fuel to the engine by a method that enables the engine to give a consistent power over variation in combustion property of the gaseous fuel being supplied to the engine. The method includes comparing between the value of the SIGIT while the engine uses gaseous fuel and the value of the SIGIT while using gasoline at a reference operating condition adjusting te (SIGFIT) such that the value of SIGIT while the engine uses the gaseous fuel equivalent to the value of the SIGIT while the engine uses gasoline at a reference operating conditions and calculating gaseous-fuel injection time for the gaseous-fuel injector.