Engine and method of operation with cylinder deactivation

Details Engine and method of operation with cylinder deactivation Engine and method of operation with cylinder deactivation

2005-04-05

2005-04-05

Kwon, John T. (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

C123S481000

Reexamination Certificate

active

06874463

ABSTRACT:
An engine with cylinder deactivation (Displacement on Demand or DOD™) includes standard (STD) cylinders which are not deactivated and DOD cylinders which can be deactivated by closing their intake and exhaust valves and shutting off their fuel supply. To provide smooth transitions, the STD and DOD cylinders form separate groups each supplied with charge air through one or more separate throttles. When switching to DOD operation, the throttles are oppositely actuated to cut out the DOD cylinders and maintain torque in the active cylinders prior to deactivation of the cylinder valves. When returning to STD operation, the valves are reactivated before oppositely actuating the throttles to enable full cylinder operation. In DOD operation, a small supercharger may be operated to boost torque of the operating STD cylinders and thus increase the DOD operating range.

REFERENCES:
patent: 3765394 (1973-10-01), Francis
patent: 4296719 (1981-10-01), Takahashi et al.
patent: 6647947 (2003-11-01), Boyer et al.
patent: 6687602 (2004-02-01), Ament
patent: 6715289 (2004-04-01), Mader et al.

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