Motorized throttle valves on conventional spark-ignited engines are designed to have a default position such that when unpowered they go to a fixed position which is between closed-in-bore and wide open. This position allows some, albeit limited, vehicle function in the event of a throttle positioning fault. Described here is a new default positioning mechanism attained by rotating the valve past the conventional operating arc (between closed-in-bore and wide open) through wide open to a partially open position. This default throttle position concept eliminates control difficulties and an undesirable failure mode. The advantages and disadvantages are discussed. Further, the required valve geometry is derived.


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    Title :

    Unconventional Approach to Achieving a Default Throttle Position


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2000 World Congress ; 2000



    Publication date :

    2000-03-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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