Patent ID: 8516999
Filing Date: 2013-08-27
Classification: F02D

Abstract:
1. A gas fuel injection control device of an engine for a vehicle comprising an intake pipe internal pressure detection unit detecting a pressure inside an intake pipe based on a predetermined control cycle and a gas pressure detection unit detecting a pressure of a gas fuel upstream of a fuel injection valve, for correcting and controlling an injection quantity of the gas fuel based on a differential pressure obtained from the detected intake pipe internal pressure and the gas pressure, said gas fuel injection control device comprising: a control unit performing control to previously set a transition determination filter value for determining a transition operation state of the engine, and calculate a transition determination intake pipe internal pressure from the transition determination filter value, an intake pipe internal pressure that was detected last time, and an intake pipe internal pressure that has been detected this time, and when a lapse time after start of the engine exceeds a predetermined value, calculate a transition determination intake pipe internal differential pressure from the intake pipe internal pressure that has been detected this time and the transition determination intake pipe internal pressure, set an intake pipe internal pressure filtering value based on the transition determination intake pipe internal differential pressure, and calculate an intake pipe internal pressure that is used for gas fuel injection control this time from the intake pipe internal pressure filtering value, the intake pipe internal pressure that has been detected this time, and an intake pipe internal pressure that was used for gas fuel injection control last time.