Fuel injection system
AssigneeRobert Bosch GmbH
InventorsThomas Wilfert, Alfred Grassle, Klaus-Jurgen Peters
Life of this patent
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Abstract
A fuel injection system for continuous injection to an internal combustion engine has a pivoting air sensor plate with a correction lever that engages a fuel control plunger for metering out fuel in proportion to the air flow. The system also includes a bimetallic, temperature-dependent strip which exerts an opening force on the correction lever when the engine is cold. An electric heater is energized by the starter switch and begins to reduce the force due to the bimetallic strip even before the engine has actually warmed up. A second electric heater of reduced power maintains the strip in disengagement during normal engine operation.
Claims6
In a fuel injection system for internal combustion engines with continuous intake manifold injection, including an air flow sensor and a throttle valve located seriatim in the intake manifold and also including a fuel metering and distributing mechanism with a control plunger actuated by said air flow sensor and further including means for applying a restoring force to said air flow sensor, the improvement comprising:
- bimetallic means, coupled to said air flow sensor, for providing a temperature-dependent force to said control plunger to thereby increase the amount of fuel delivered when the engine starting temperature is below approximately 20.degree. C., wherein said air flow sensor has a main lever and a correction lever pivotable thereon and wherein one end of said bimetallic means is attached to said main lever while the opposite end of said bimetallic means engages said correction lever which actuates said control slide in said fuel metering and distributing mechanism.
Dependencies are inferred from the claim text.