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US 4,784,101 AGranted
Fuel injection control device
AssigneeNippondenso Co., Ltd.
InventorsTakashi Iwanaga, Hideya Fujisawa, Masaaki Kato, Masahiko Miyaki
Life of this patent
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Abstract
A fuel injection control device in which a needle valve of a fuel injector is opened and closed by two valves. The fuel injector has a pressure control chamber and a fuel chamber, and the needle valve opens a fuel injection aperture to inject the fuel in the fuel chamber to the engine when a pressure in the pressure control chamber is relatively high. One valve is provided in a passage which connects a pump, the pressure control chamber, and a reservoir, and the other valve is provided in a passage which connects the pump, the fuel chamber, and the reservoir.
Claims21
A fuel injection control device for an internal combustion engine, said device comprising:
- A fuel injector having a body, said body having a bore, a fuel injection aperture and a fuel chamber formed therein, a needle valve slidably housed in said bore, and a pressure mechanism including a pressure control chamber, a pressure in said pressure control chamber causing said needle valve to prevent communication between said fuel chamber and said fuel injection aperture when a pressure in said pressure control chamber is relatively high, and causing said needle valve to allow communication between said fuel chamber and said fuel injection aperture when a pressure in said pressure control chamber is relatively low,
- a pump having a high pressure chamber and means for pressurizing fuel in said high pressure chamber to send the fuel to said pressure control chamber and said fuel chamber,
- means for reserving a low pressure fuel,
- a first electrically-controlled on-off valve provided between said high pressure chamber and said pressure control chamber, said first valve connecting said pressure control chamber to said high pressure chamber when said first on-off valve is in a first state thereof and to said reserving means when said first on-off valve is in a second state thereof,
- a second electrically-controlled on-off valve provided for allowing connection of said high pressure chamber and said fuel chamber to said reserving means when said second on-off valve is in a first state thereof and preventing the connection when said second on-off valve is in a second state thereof,
- a position sensor sensing a rotational position of a crankshaft of said engine, and
- means for switching first and second states of said first and second valves according to the sensed rotational position of said crankshaft of said engine, said switching means switching said first valve and said second valve to said respective first state upon the end of a fuel injection from said fuel injector.
4 more elements
A fuel injection control device for an internal combustion engine, said device comprising:
- A fuel injector having a body, said body having a bore, a fuel injection aperture and a fuel chamber formed therein, a needle valve slidably housed in said bore, and a pressure mechanism including a pressure control chamber, a pressure in said pressure control chamber causing said needle valve to prevent communication between said fuel chamber and said fuel injection aperture when a pressure in said pressure control chamber is relatively high, and causing said needle valve to allow communication between said fuel chamber and said fuel injection aperture when a pressure in said pressure control chamber is relatively low,
- a pump sending a pressurized fuel to said pressure control chamber and said fuel chamber,
- means for reserving a low pressure fuel,
- a first electrically-controlled on-off valve provided between said pump and said pressure control chamber, said first valve connecting said pressure control chamber to said pump when said first on-off valve is in a first state thereof and to said reserving means when said first on-off valve is in a second state thereof,
- a second electrically-controlled on-off valve provided for connecting said fuel chamber to said reserving means when said second on-off valve is in a first state thereof and to said pump when said second on-off valve is in a second state thereof,
- a position sensor sensing a rotational position of said crankshaft of said engine, and
- means for switching first and second states of said first and second valve according to the sensed rotational position of said crankshaft of said engine, said switching means switching said first valve and said second valve to said respective first state upon the end of fuel injection from said fuel injector.
4 more elements
Dependencies are inferred from the claim text.