Back to results
US 2001/0042566 A1Published application
Valve position detector
AssigneeFuji Oozx Inc.
InventorsAkiyoshi Mori, Makoto Adegawa, Haruki Kobayashi
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFuji Oozx Inc.
InventorsAkiyoshi Mori, Makoto Adegawa, Haruki Kobayashi
Estimating the term…
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.
A valve position detector for detecting position of a poppet valve driven by a valve operating mechanism, a valve stem of said valve being slidably supported by a cylinder head, said detector comprising:
A valve position detector as claimed 8 wherein a bellows-like cover is mounted between an upper end outer circumferential surface of the fixed electrode and an upper end of the moving electrode to prevent foreign substance from invading between the two electrodes.
A valve position detector as claimed 7 wherein an electromagnetic actuator is provided over the variable capacity electrode.
Dependencies are inferred from the claim text.