초록 ▼

A fuel pressure control system has a fuel pressure regulator having a reference chamber and a fuel chamber separated by a diaphragm which opens and close a fuel return passage in accordance with a pressure difference between both chambers. There are provided an accumulator for containing an air pres

A fuel pressure control system has a fuel pressure regulator having a reference chamber and a fuel chamber separated by a diaphragm which opens and close a fuel return passage in accordance with a pressure difference between both chambers. There are provided an accumulator for containing an air pressurized by a supercharger, and a temperature sensor for sensing a temperature of the fuel. A control unit normally puts a three-way electromagnetic fuel pressure control valve in a first position to introduce an intake manifold vacuum into the reference chamber. When the temperature sensed by the temperature sensor is higher than a predetermined value, the control unit puts the valve in a second position to introduce a high pressure air in the accumulator into the reference chamber to prevent vapor lock by increasing the fuel pressure.

대표청구항 ▼

A system for controlling fuel pressure in a fuel supply system for a fuel injection type internal combustion engine equipped with a supercharger, comprising: a pressure regulator having a diaphragm separating a reference pressure chamber and a fuel chamber which is in fluid communication with a fuel

A system for controlling fuel pressure in a fuel supply system for a fuel injection type internal combustion engine equipped with a supercharger, comprising: a pressure regulator having a diaphragm separating a reference pressure chamber and a fuel chamber which is in fluid communication with a fuel feed passage for conveying fuel from a fuel pump to at least one fuel injector of the engine, and a fuel return port for draining the fuel from said fuel chamber, said diaphragm being capable of opening and closing said fuel return port in accordance with a pressure difference between both chambers, normal reference pressure supplying means for introducing an air pressure in an intake air passage of the engine at a position downstream of a throttle valve of the engine in said reference pressure chamber, high reference pressure supplying means for containing an air pressurized by the supercharger, a temperature sensor for sensing a temperature of the fuel in the fuel supply system, and fuel pressure control means for supplying the air pressure of said high reference pressure supplying means to said reference pressure chamber when the temperature sensed by said temperature sensor is equal to or higher than a predetermined value, wherein said high reference pressure supplying means comprises an accumulator for containing the air pressurized by the supercharger, and said fuel pressure control means comprises a three-way valve having a first position for supplying the pressure from said normal reference pressure supplying means to said reference pressure chamber and a second position for supplying the pressure from said high reference pressure supplying means to said reference pressure chamber, and a control unit producing a control signal to control said valve in accordance with the temperature sensed by said temperature sensor.