Fuel injection system
AssigneeRobert Bosch GmbH
InventorGerhard Stumpp
Life of this patent
Estimating the term…
Abstract
A fuel injection system for stratified-charge engines includes a fuel metering valve assembly controlled by an air flow sensor. The restoring force on the movable plunger in the fuel metering assembly may be varied in dependence on load by a differential pressure valve whose bias is changed by a cam-follower which cooperates with a gas-pedal linked cam. The system may also include a throttle bypass also controlled by a cam. The system may further include separate fuel injection valves for each main combustion chamber, fed by a fuel distributor mechanism.
Claims11
A fuel injection system for use with a mixture-compressing, externally ignited, stratified-charge internal combustion engine which has an air induction tube and a fuel supply pump and each of whose cylinders includes a precombustion chamber and a main combustion chamber, comprising, in combination:
- A. an air flow measuring sensor, disposed within the induction tube of the engine;
- B. an arbitrarily actuatable throttle valve, disposed within the induction tube of the engine;
- C. means for exerting a restoring force on said air flow measuring sensor;
- D. fuel metering valve means, including a movable control plunger actuated by said air flow measuring sensor;
- E. means for controlling the pressure drop across said fuel metering valve means;
- F. a fuel injection pump driven by the engine and supplied with fuel by said fuel metering valve means;
- G. at least one fuel injection valve associated with each of said pre-combustion chambers and supplied intermittently with fuel by said fuel injection pump;
- and
- H. means for sensing the position of said throttle valve and for influencing said fuel injection pump so as to vary the amount of fuel supplied by said fuel injection pump to said fuel injection valves associated with said pre-combustion chambers.
Dependencies are inferred from the claim text.