초록 ▼

Supply of fuel is stopped when fuel pressure sensed by a pressure sensor provided upstream of a regulator is at a predetermined value or less to avoid abnormal combustion caused by improper adjustment of air/fuel ratio. Even slight variation of the fuel pressure is sensed by monitoring the fuel pres

Supply of fuel is stopped when fuel pressure sensed by a pressure sensor provided upstream of a regulator is at a predetermined value or less to avoid abnormal combustion caused by improper adjustment of air/fuel ratio. Even slight variation of the fuel pressure is sensed by monitoring the fuel pressure in an interval after closing a fuel shut-off valve once opened to re-opening of it. In addition, an abnormal state in the fuel system is detected by comparing an accumulated value of amount of injected fuel and an estimated value of fuel consumption in the tank. Furthermore, the peak current value of the fuel injection valve is controlled so that, when the engine at a low temperature is started, lift load of the injection valve is larger than sticking force of the injection valve, thereby preventing such situation where the injection valve is frozen so that it cannot supply fuel to the engine. In this case, the engine can be smoothly started by simultaneously controlling the valve open time. Furthermore, the temperature of the regulator is properly maintained so that optimum function can be exhibited by controlling the flow rate of cooling water flowing through a water passage provided in the regulator for regulating the fuel gas pressure.

대표청구항 ▼

A gas fuel supply system of a gas engine vehicle, comprising: fuel supply stop means for avoiding abnormal combustion caused from improper adjustment of air/fuel ratio due to reduction of fuel pressure in the gas fuel supply system; fuel shut-off means enabled to detect even slight variation of the

A gas fuel supply system of a gas engine vehicle, comprising: fuel supply stop means for avoiding abnormal combustion caused from improper adjustment of air/fuel ratio due to reduction of fuel pressure in the gas fuel supply system; fuel shut-off means enabled to detect even slight variation of the fuel pressure by monitoring the fuel pressure in an interval after closing a fuel shut-off valve once opened to re-opening of it; fuel system abnormal state sensing means for sensing an abnormal state in the fuel system by comparing an accumulated value of amount of injected fuel with a calculated value of consumption of fuel in a tank; fuel injection valve control means for increasing lift load for a fuel injection valve at starting the engine at a low temperature and for enabling it to control the fuel injection valve open time; and a first regulator for holding the temperature of a second regulator regulating the fuel gas pressure, and for optimizing its performance by controlling flow rate of cooling water flowing through a water passage provided in the second regulator.