Engine operating method and apparatus

Details Engine operating method and apparatus Engine operating method and apparatus

2005-07-12

2005-07-12

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

C123S1980DB, C123S090160

Reexamination Certificate

active

06915775

ABSTRACT:
An internal combustion engine includes a plurality of cylinders each having intake and exhaust valves and at least one camshaft timed to operate the valves with a high performance fixed overlap. Each camshaft has a cam phaser controlled to equally vary the intake and exhaust valve timing for superior full throttle performance over the engine speed range; Valve deactivation mechanisms operate to deactivate up to half the cylinders during idle and light load operation for increasing fuel efficiency and emission control and maintaining stable operation of the operating cylinders. The engine may also be started with half the cylinders cut out and then run with stable operation in this mode during idle and light load because the increased load on the operating cylinders gives stable operation with an increased valve overlap permitting increased performance and emission control at higher load operation on all the cylinders.

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