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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiromitsu Seo, Masanao Idogawa
Estimating the term…
A fuel pump draws pumps fuel from a fuel tank to a pressurizing chamber during a suction stroke, and pressurizes and sends fuel in the pressurizing chamber to a delivery pipe. A electromagnetic valve is actuated by electricity from a battery to electively connects and disconnects the fuel tank with the pressurizing chamber. An ECU determines opening and closing timing of the electromagnetic valve based on the rotation al phase of an engine. When the rotational phase of the engine is not identified, the ECU executes a duty control to cyclically repeat supplying and stopping of current to the electromagnetic valve. The ECU extends a current supplying period in each cycle of the duty control as the voltage of the power supply is lowered. As a result, the electromagnetic valve is reliably closed particularly at each pressurizing stroke, which improves the pressure increasing efficiency of fuel supplied to a fuel injection system.
A high pressure fuel supplying apparatus, which pressurizes fuel supplied from a fuel supply source and sends the pressurized fuel to a fuel injection system of an internal combustion engine, the apparatus comprising:
A high pressure fuel supplying apparatus, which pressurizes fuel supplied from a fuel supply source and sends the pressurized fuel to a fuel injection system of an internal combustion engine, the apparatus comprising:
A method for controlling a high pressure fuel supplying apparatus for an internal combustion engine, wherein the apparatus includes a fuel pump having a pressurizing chamber and an electromagnetic valve, wherein the fuel pump repeats a pressurizing stroke and a suction stroke in accordance with rotation of the engine, wherein, during each suction stroke, the fuel pump draws fuel from a fuel supply source to the pressurizing chamber, and wherein, during each pressurizing stroke, the fuel pump pressurizes fuel in the pressurizing chamber and sends the pressurized fuel to a fuel injection system of the engine, wherein the electromagnetic valve is actuated by electricity supplied from a power supply to selectively connect and disconnect the pressurizing chamber with the fuel supply source, the method comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
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Controlling the fuel pressure: by controlling the flow into the common rail, e.g. the amount of fuel pumped
For engine starting or warming up: for starting
Of reciprocating-piston or reciprocating-cylinder type: having an accumulator storing pressurised fuel during pumping stroke of the piston for…
By variably-timed valves controlling fuel passages to pumping elements or overflow passages: valves being actuated electrically
Term ended 6 Jun 2023 (estimated)
The present invention relates to an high pressure fuel supplying apparatus for in an internal combustion engine, which apparatus sends high pressure fuel to a fuel injection system of the engine, and to a method for controlling the apparatus.
Japanese Laid-Open Patent Publication No. 10-61468 discloses a high pressure fuel pump having a plunger that is reciprocated by rotation of a crankshaft of an engine. Reciprocation of the plunger in a pressurizing chamber draws fuel into the pressurizing chamber and pressurizes the drawn fuel. The pressurized fuel is sent to a delivery pipe.
During a suction stroke of the plunger, in which the pressurizing chamber is expanded, an electromagnetic valve located in the pressurizing chamber is supplied with no current and is thus opened. As a result, fuel is supplied to the interior of the pressurizing chamber from a feed pump, which forms part of a fuel supply source. During a pressurizing stroke of the plunger, in which the pressurizing chamber is compressed, the electromagnetic valve is supplied with current and closed at a time corresponding to the amount of fuel that is to be sent to the fuel injection system. As a result, fuel in the pressurizing chamber is pressurized. The pressurized fuel pushes open a fuel discharge valve and is supplied to the delivery pipe, which forms part of a fuel injection system.
The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
FIG. 1 is a diagrammatic view illustrating a high pressure fuel pump, an engine, and a control system according to a first embodiment;
FIGS. 2(A) to 2(C) are cross-sectional views showing a suction stroke of the high pressure fuel pump of FIG. 1 after the crank angle is identified;
A first embodiment of the present invention will now be described with reference to FIGS. 1 to 7.
FIG. 1 shows a high pressure fuel pump 2, an internal combustion engine, and a control system for controlling the pump 2 and the engine. In this embodiment, the internal combustion engine is a cylinder injection type gasoline engine 4.
The engine 4 has engine cylinders (not shown), fuel injection valves 32, a crankshaft 5. A combustion chamber is defined in each engine cylinder, and each fuel injection valve 32 corresponds to one of the engine cylinders. A delivery pipe 30 is connected to the fuel injection valves 32. The fuel injection valves 32 and the delivery pipe 30 form a fuel injection system. A piston (not shown) reciprocates in each engine cylinder. Accordingly, the crankshaft 5 rotates.