Control system for improving the cold start capability of spark-ignition and direct-injection engines (SIDI engines)

摘要

A control system, comprising: a motor activation module (206) that determines if predetermined operating conditions of a spark-ignition direct injection (SIDI) engine (10) are met and activates an engine preparation mode when the predetermined operating conditions are met; and a fuel control module (208) that controls a fuel injector (62) to provide a prepare pulse to a cylinder (14) of the SIDI engine when the engine preparation mode is activated, wherein the fuel injector (62) initiates the prepare pulse by opening for a Pulse width to inject fuel directly into the cylinder (14) when the SIDI engine (10) is stopped, characterized in that the fuel control module (208) the pulse width based on a fuel pressure in a fuel rail of the SIDI engine (10) , a temperature of a coolant in the SIDI engine (10), a percentage of ethanol in the fuel supplied to the SIDI engine (10), and a predetermined relationship between the pulse width, fuel rail pressure, engine coolant temperature, and ethanol Percentage of fuel determined.