SYSTEMS AND METHODS FOR MONITORING AND CONTROLLING CRANKCASE COMBUSTIBLE GAS CONCENTRATIONS

An internal combustion engine system is described herein. The system uses a throttle valve at an inlet of a crankcase to control the flowrate of air into the crankcase. The air is used to purge one or more combustible fluids from the crankcase caused from blow-by past one or more piston rings. A purge controller receives measurements from various detectors to control the flowrate. A concentration detector may be used to detect a concentration of one or more combustible fluids within the crankcase. Pressure and temperature detectors may be used to provide a measurement of the pressure and temperature within the crankcase. The purge controller also uses a venturi valve to increase or decrease the pressure within the crankcase. Additionally, the purge controller can measure an amount of blow-by gases by closing the throttle valve and measuring the rate of increase of the pressure within the crankcase.