| 摘要 |
In a fuel injection system, wherein fuel in a fuel tank is pressurized by a fuel pump and the pressurized fuel is fed to a fuel flow control apparatus operating to meter the fuel flow according to the Venturi negative pressure occuring at the Venturi portion in an engine suction system, and the fuel is supplied to the engine in proportion to the suction air quantity, a fuel pressure regulator for controlling the fuel pressure is provided between the fuel pump and the fuel flow control apparatus. The fuel pressure regulator is provided with a fuel pressure compensating apparatus for compensating the fuel pressure controlled by the fuel pressure regulator in accordance with the magnitude of an output signal of an oxygen concentration detector which is provided in an engine exhaust system and produces a signal corresponding to the residual oxygen concentration in exhaust gases. Thus, the accuracy of the mixture ratio of air to fuel which is supplied to the engine suction system is improved and the poisonous components contained in the exhaust gases are reduced.
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