Hitachi, Ltd.

Hitachi Automotive Engineering Co., Ltd.

Ikuo Takahashi

Yoshikazu Hoshi

Yukinori Sano

To improve the operating efficiency of a diesel engine, a plurality of engine operating parameters are detected and the engine cylinders to which the fuel supply is to be cut off are computed in accordance with the operating parameters, thereby stopping the generation of fuel control pulses in response to crank angle sensor output pulses indicative of the computed cylinders. A fuel injection pump is so constructed that the fuel is metered in response to the fuel control pulses and the metered fuel is pressurized, compressed and distributed to the cylinders, and the distribution of the pressurized and compressed fuel to the cylinders is stopped by stopping the application of the fuel control pulses.

Apparatus for controlling the number of operative cylinders of a diesel

A fuel pump for internal combustion engine has a working chamber which is divided into two chamber sections by a shuttle disposed therein, and a pumping chamber independent from the working chamber. After a delivery of a fuel into one of the chamber sections and the pumping chamber, the one chamber section is brought into communication with an injection nozzle and the pumping chamber is made to communicate with the other chamber section. Then, the volume of the pumping chamber is decreased and the fuel is pumped into the other chamber section from the pumping chamber, so that the fuel in the one chamber section is pumped into the injector nozzle through the shuttle by means of the fuel contained in the other chamber section.

Fuel pumping apparatus

A fuel injection pump for an internal combustion engine including a rotor located in a housing, a free piston movably mounted in an axial bore in the rotor, two pressure chambers defined by an inner wall surface of the axial bore in the rotor the free piston, and two solenoid valves for supplying fuel to the pressure chambers and a sensor for sensing a displacement of the free piston in an axial direction.

Fuel injection pump for internal combustion engine

Two solenoid valves having needle valves to control the supply of fuel to a rotary distributor are mounted in such a manner that the needle valves move in a direction tangent to the rotating circle of a rotary distributor.

Fuel injection pump for internal combustion engines

A method and a system are disclosed for controlling the amount and advance of fuel injection of a diesel engine using an injection pump of the type which defines the fuel supply period and the compression period, alternately, in synchronism with explosion-exhaustion and intake-compression strokes of each cylinder of the engine, and includes first and second pressure chambers to be supplied with fuel through first and second electromagnetic valves, respectively, during the fuel supply period, and the fuel in the amount equivalent to the fuel amount supplied to said second pressure chamber being injected into the cylinder at an injection timing determined from the total amount of the fuel supplied to said first and second pressure chambers. The open time intervals of the first and second electromagnetic valves are determined from the fuel amount to be injected into each cylinder and the injection timing advance which are determined in accordance with the engine operating conditions. The opening starting time points of the electromagnetic valves are selected in such a manner as to open the two valves for the above-determined time intervals respectively within the fuel supply period and to minimize the overlap of the open times of the two valves.

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Katsuta, Japan

Ikuo Takahashi