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.
Unconventional Approach to Achieving a Default Throttle Position
Sae Technical Papers
SAE 2000 World Congress ; 2000
2000-03-06
Aufsatz (Konferenz)
Englisch
Unconventional Approach to Achieving a Default Throttle Position
British Library Conference Proceedings | 2000
|Unconventional approach to achieving a default throttle position
Kraftfahrwesen | 2000
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