Fuel injection system
AssigneeInstitut fur Motorenbau Professor Huber e.V.
InventorWolfgang Schaffitz
Life of this patent
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Abstract
A fuel injection system for dosing and atomizing fuel under high pressure into the cylinders of an internal combustion engine has a continuously operating, controllable-flow-rate fuel pump and at least one adjusting drive associated with injection nozzles respectively for each cylinder of the engine. The flow rate of the fuel pump is controlled by the sum of the fuel quantities to be fed per unit time to all of the injection nozzles for controlling the fuel dose injected into each cylinder. The adjusting drive at least opens a fuel path to the injection nozzle for each cylinder at the correct time to control the injection timing. Separating the dose and timing controls in this way simplifies the structure required for both controls.
Claims27
A fuel injection system for dosing and atomizing fuel into each cylinder of an internal-combustion engine, comprising:
- (a) an injection nozzle for each cylinder of the engine for atomizing the fuel into the respective cylinder;
- (b) a continuously-operating, controllable-flow-rate fuel pump for continuously pressurizing and dosing the fuel per unit of time from said fuel pump up to and through every injection nozzle for atomizing the fuel into the respective cylinder thereby delivering a quantity of the fuel required by the fuel injection system per said unit of time;
- (c) fuel path means for forming a fuel path and collective pressure chamber for the entire fuel flow from the fuel pump to every injection nozzle;
- (d) at least one timing means associated with each injection nozzle for opening, and controlling the timing of at least the opening of to each injection nozzle;
- and
- (e) means for setting the controllable flow rate of the fuel pump to the sum of the fuel quantities to be injected into every cylinder of the engine per unit of time such that a return flow of the fuel quantities into the fuel injection system is eliminated.
Dependencies are inferred from the claim text.