Fuel injection apparatus
AssigneeVolkswagenwerk Aktiengesellschaft
InventorsKlaus-Dieter Emmenthal, Otto Schafer, Rudolf-Helmut Strozyk
Life of this patent
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Abstract
Apparatus for injecting fuel into the intake pipes of an internal combustion engine. The apparatus has an air channel branching off from the intake line at a point ahead of an adjustable throttle flap; a fuel metering device supplying fuel to the air channel in dependence upon engine load; and a fuel delivery pump arranged to receive a fuel-air mixture from the air channel through a narrowed constriction. The fuel pump passes the fuel-air mixture, with additional air which may be supplied thereto, to a fuel distributor which directs the mixture to the individual intake pipes of the engine.
Claims9
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination:
- (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section;
- (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load;
- (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine;
- (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor;
- (e) auxiliary fuel supply means for supplying additional fuel to said engine for idling and/or cold starting operation;
- and
- (f) a fuel float chamber connected to supply fuel both to said fuel metering means and to said auxiliary fuel supply means, the fuel level in said floatchamber being arrested at a height with respect to said auxiliary fuel supply means that the fuel pressure head is sufficient to ensure a proper fuel supply thereto.
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination:
- (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section;
- (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load;
- (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine;
- (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor;
- (e) means for supplying additional air and fuel during cold starting and warm-up operation of the engine including:
- (1) means, receiving additional air from said intake line, for supplying said additional air to said intake pipes of the engine;
- (2) means for supplying additional fuel to said air channel;
- and
- (3) control means, responsive to a temperature of said engine, for simultaneously controlling the amount of said additional air and said additional fuel.
Dependencies are inferred from the claim text.