Valve position detector
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United States of America Patent
Stats
-
May 7, 2002
Grant Date -
Nov 22, 2001
app pub date -
Jul 17, 2001
filing date -
Oct 20, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A poppet valve moves up and down in a valve operating mechanism in an internal combustion engine. A cylindrical fixed electrode is fixed to a support plate on a cylinder head, and a cylindrical moving electrode is mounted to the lower surface of a valve spring retainer which is mounted to the poppet valve via a cotter. The fixed electrode is connected to a circuit which comprises a variable condenser and a resistance. The valve moves up and down during firing operation of the engine. Thus, variation in electrostatic capacity is detected by the two electrodes, transmitted to a circuit via a lead mounted to the fixed electrode, and converted to a voltage by the circuit, thereby detecting valve position exactly.
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