Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1989-07-20
1990-05-29
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 134
Patent
active
049286404
ABSTRACT:
Autocalibration of the camshaft phasing sensor of a closed-loop variable valve timing system of an internal combustion engine. The camshaft phasing adjustment mechanism comprises a cam that changes the camshaft phasing. This cam is provided with a dwell that occurs at a known true phasing of the camshaft. The cam is commanded to operate to the dwell, and the lack of change in the sensor output indicates when the dwell is reached. At this time the sensor output should exactly indicate the known camshaft phasing that is produced by the adjustment cam dwell. If it does not, the difference is calculated and forms an offset that is algebraically applied to the sensor output thereby calibrating the sensor.
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van Vuuren Willem N. J.
Wakeman Russell J.
Boller George L.
Lo Weilun
Myhre Charles J.
Siemens-Bendix Automotive Electronics L.P.
Wells Russel C.
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