System for verifying cylinder deactivation status in a...

Details System for verifying cylinder deactivation status in a... System for verifying cylinder deactivation status in a...

2008-01-01

2008-01-01

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

C073S116070

Reexamination Certificate

active

07314034

ABSTRACT:
In a multi-cylinder internal combustion engine having intake valve deactivation apparatus providing de-activation of the intake valves of selected cylinders during engine operation, correct cylinder activation status is verified by measuring gas pressure in a conduit conducting combustion related gases through the cylinders of the engine, detecting consecutive pulses in the pressure due to predetermined activations of the intake valves, comparing the time periods between the consecutive pulses to reference time periods based on crankshaft position and corresponding to expected time periods between the consecutive pulses and providing verification signals and cylinder identification of faulty intake valve deactivation or activation in response to the comparisons.

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