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US 4,671,232 AGranted
Fuel injection system for self-igniting internal combustion engines
AssigneeRobert Bosch GmbH
InventorsGerhard Stumpp, Wilfried Sautter, Wolf Wessel
Life of this patent
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Abstract
A fuel injection system functioning with a reservoir, in which a quantity received by the reservoir is injected after the termination of pump supply for the purpose of prolonging the injection time.
Claims20
A fuel injection system for a self-igniting internal combustion engine, which comprises:
- a plurality of fuel injection nozzles which open at a predetermined opening pressure;
- injection pump means connected to said injection nozzles via respective fuel pressure lines for supplying pressurized fuel to each injection nozzle in sequence during successive pumping operations of the pump means;
- a pump work chamber in said injection pump means;
- at least one check valve in the fuel pressure lines to said injection nozzles for preventing reverse flow of fuel from the fuel pressure lines into the work chamber of said pump means;
- fuel metering means for determining the fuel quantities supplied by the pump means;
- and
- a fuel reservoir means, connected with one pressure line, for delaying a portion of the fuel supplied to an injection nozzle by the pump means;
- said one pressure line being connected downstream of said at least one check valve to respective fuel pressure lines leading to said injection nozzles, wherein during each pumping operation of the pump means a portion of the fuel being supplied to the corresponding injection nozzle is termporarily received by the fuel reservoir means and stored therein at a reservoir working pressure which is greater than the opening pressure of the injection nozzles, and wherein, after the termination of said pumping operation of the pump means, the portion of the fuel stored in the fuel reservoir means is supplied as a result of the reservoir working pressure to the injection nozzle which during said pumping operation has just been supplied with fuel.
5 more elements
A fuel injection system for a self-igniting internal combustion engine, which comprises:
- a plurality of fuel injection nozzles which open at a predetermined opening pressure;
- injection pump means for supplying pressurized fuel to each injection nozzle in sequence during corresponding successive pumping operations of the pump means;
- fuel metering means for determining the fuel quantities supplied by the pump means;
- and
- fuel reservoir means for delaying a portion of the fuel supplied to each injection nozzle by the pump means wherein said fuel reservoir means includes at least one reservoir assembly which comprises:
- a housing;
- a reservoir piston which is slidably disposed within the housing and which is stressed by a stressing element such as a spring;
- a reservoir chamber defined by the housing and one end of the piston, which is connected to receive at least a portion of the pressurized fuel to be stored;
- and
- a return chamber defined by the housing and an opposite end of the piston, which is connected by a check valve to a source of fluid whose pressure is controllable.
7 more elements
Dependencies are inferred from the claim text.