Patent ID: 6382246
Filing Date: 2002-05-07
Classification: F01L,G01D,Y10T

Abstract:
A valve position detector for detecting a 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 variable capacitance electrode of an electrostatic capacitance sensor configured for detecting a position of said valve by detecting a variation in electrostatic capacitance when said valve is moved, said variable capacitance electrode being provided between said cylinder head or a stationary member integrally formed therewith, and said valve or a member which follows said valve, wherein an electromagnetic actuator is provided to move the valve up and down, and wherein an external thread is formed at a lower end of said electromagnetic actuator, and an external thread is formed at an upper end valve, and wherein said two external threads are connected by a connecting member, said variable capacitance electrode comprising a fixed electrode carried by the cylinder block and a moving electrode carried by the valve to form an electrostatic capacitance valve displacement sensor.