Fuel metering and injection system for internal combustion engines
AssigneeRobert Bosch GmbH
InventorSiegfried Holzbaur
Life of this patent
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Abstract
A fuel preparation system for an internal combustion engine employs an induction tube air flap which is shaped so as to be subject to aerodynamic lift forces when the air flow has caused a substantial displacement of the flap. In addition, the wall of the induction tube is made inwardly movable so that the net cross section available to the air flow may be reduced and a proportionately greater deflection rate obtained. The fuel quantity, which is related to the angular deflection is thus increased, causing a richer mixture. The air flap has internal channels which carry fuel from the pivotal shaft to the induction tube for injection into the air stream.
Claims13
In a fuel injection system for internal combustion engines, said system including air flow metering means having a pivotable air flap disposed in the induction tube of the engine, said air flap being pivoted by the forces due to differences of pressure upstream and downstream thereof when the air flow is small and being pivoted by forces due to aerodynamic lift when the air flow is greater, the improvement comprising:
- mounting said air flap on a pivotable shaft by means of a connecting bridge which has a flow profile offering substantially minimum resistance to the air flow and in such a manner that the surface defined by said air flap is substantially parallel to and external to said shaft.
Dependencies are inferred from the claim text.