Patent ID: 7281517
Filing Date: 2007-10-16
Classification: F02D,F02M

Abstract:
1. A double system of fuel injection type internal combustion engine comprising: a direct injection injector; a port fuel injection injector; a control unit for changing an fuel injection distribution ratio of fuels injected from the direct injection injector and port fuel injection injector in accordance with an operating condition of the engine; 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 for detecting a fuel pressure in the delivery pipe; a fuel temperature sensor for detecting a fuel temperature in the delivery pipe; and a fuel regulating unit for regulating the fuel pressure and fuel temperature in the delivery pipe, wherein at a time 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 detected respectively by the fuel pressure sensor and the fuel temperature sensor exceeds over an aimed value, the control unit controls the fuel regulating unit so as to lower the exceeding value thereof.