Abstract: A double system of fuel injection type internal combustion engine includes: a direct injection injector and a port fuel injection injector; a control unit for changing a fuel injection distribution ratio of fuels injected from these injectors; a delivery pipe for the direct injection injector; a high pressure fuel pump; a fuel pressure sensor and a fuel temperature sensor for detecting a fuel pressure and a fuel temperature in the delivery pipe; and a fuel regulating unit for regulating the fuel pressure and fuel temperature in the delivery pipe. The control unit can control the fuel regulating unit so as to lower the exceeding value thereof when the fuel injection distribution ratio of the port fuel injection injector is higher than that of the direct injection injector and at least one of the fuel pressure value and fuel temperature value exceeds an aimed value.

Abstract: A double system of fuel injection type internal combustion engine includes: a direct injection injector and a port fuel injection injector; a control unit for changing an fuel injection distribution ratio of fuels injected from these injectors; a delivery pipe connected to the direct injection injector so as to supply the fuel to the direct injection injector; a high pressure fuel pump for supplying the fuel under pressure to the direct injection injector through the delivery pipe; a fuel pressure sensor and a fuel temperature sensor for detecting a fuel pressure and a fuel temperature in the delivery pipe; and a fuel regulating unit for regulating the fuel pressure and fuel temperature in the delivery pipe.

Abstract: A supercharged internal combustion engine embodying a construction for maintaining the desired supercharger pressure in the induction system and avoiding the objectionable noises that occur with conventional system wherein the bypass flow is all discharged into the induction system upstream of the supercharger. This is done by bypassing the intake air from the area between the supercharger and the combustion chamber to a point other than in said induction system an particularly to the engine exhaust system.