Method and apparatus for clean cold starting of internal combust

Internal-combustion engines – Starting device – Control of spark ignition during starting

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Details

1231798, 123525, 123576, 123578, F02N 1708

Patent

active

055490832

ABSTRACT:
An improved starting system for internal combustion engines using gaseous fuels such as hydrogen, natural gas, propane, butane and the like. In an engine using liquid fuel injection for normal operation, a sensor for the catalytic converter is provided to sense a "cold converter" condition of the sort which occurs when the engine has not been operated for some time. When starting is initiated, the gasoline introduction system is disabled and introduction of the gaseous fuel in initiated. Rapid engine start promptly occurs, even under very cold ambient conditions. Once the engine has started and has run for a period to warm the catalytic converter to a selected temperature the gaseous fuel introduction system is interrupted and the gasoline system is enabled and provides the fuel thereafter. Catalytic converter temperature is preferably measured at the catalytic material, although measurement of exhaust gas temperature at the converter or downstream thereof is often effective. If desired, gaseous fuel flow may continue for a very short period after liquid fuel flow has begun. This system improves the life of the catalytic converter and the engine, reduces hydrocarbon and carbon monoxide emissions during starting and eliminates the need for special, higher cost, gasoline mixes for winter cold starting.

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