Intake and exhaust valves control of internal combustion engine

Details Intake and exhaust valves control of internal combustion engine Intake and exhaust valves control of internal combustion engine

1994-10-07

1996-03-12

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9016, 123 9017, F01L 134, F02D 1302

Patent

active

054977371

ABSTRACT:
An apparatus for operating an intake valve and an exhaust valve of an internal combustion engine. The apparatus including a sensor for generating an output for distinguishing an engine operation under a cold condition from other engine operations, and an intake valve gear for the intake valve which incorporates an intake variable valve timing mechanism. The apparatus also includes an exhaust valve gear for the exhaust valve which incorporates an exhaust variable valve timing mechanism. A control unit is provided, which is operatively responsive to the output of the sensor, to condition the exhaust variable valve timing mechanism for providing an advanced closing timing of the exhaust valve before a top dead center of an engine piston stroke, and at the same time, condition the intake variable valve timing mechanism for providing an advanced opening timing of the intake valve, which is disposed before the top dead center of the engine piston stroke, to provide a predetermined valve overlap between the exhaust and intake valves, whereby hydrocarbon emission via the exhaust valve is reduced remarkably without deteriorating stable operation of the engine.

REFERENCES:
patent: 5133310 (1992-07-01), Hitomi et al.
patent: 5159905 (1992-11-01), Sugiuchi et al.
patent: 5224460 (1993-07-01), Havstad et al.
patent: 5230320 (1993-07-01), Hitomi et al.
patent: 5275137 (1994-01-01), Uesugi
patent: 5293741 (1994-03-01), Kashiyama et al.
patent: 5301636 (1994-04-01), Nakamura

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