Fuel injection apparatus
AssigneeVolkswagenwerk Aktiengesellschaft
InventorsKlaus-Dieter Emmenthal, Otto Schafer, Rudolf-Helmut Strozyk
Life of this patent
Estimating the term…
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.
Claims22
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;
- and
- (e) means for supplying auxiliary air at the outlet of said fuel pump for forming a fuel-air mixture to be supplied to said distributor, said auxiliary air supplying means including an air pressure generator and a bypass line connecting said air pressure generator to said fuel pump outlet in the immediate vicinity of said fuel pump.
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having a first intake line for conducting air to said intake pipes with a first 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;
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- (e) a second intake line arranged in parallel with said first intake line and having a second, arbitrarily adjustable throttle flap arranged therein;
- wherein said fuel metering means includes means for metering additional fuel in dependence upon the air flow through said second intake line.
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;
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- (e) auxiliary fuel supply means for supplying additional fuel, at a point immediately ahead of said distributor, for acceleration of the engine.
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, said fuel delivery pump having separate chambers for fuel and air and a common drive means for changing the volume of said chambers to effect a pumping action;
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- (e) means for supplying additional air to said fuel delivery pump for forming a fuel-air mixture to be supplied to said distributor.
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:
- p1 (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 delivery pump for fuel and air connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor;
- (e) an auxiliary fuel supply means for supplying additional fuel directly into said intake pipes for acceleration of the engine;
- and
- (f) means for supplying auxiliary air at said delivery pump for forming a fuel-air mixture to be supplied to said distributor.
Dependencies are inferred from the claim text.