Valve timing control apparatus for engine

Details Valve timing control apparatus for engine Valve timing control apparatus for engine

1996-03-29

1997-05-06

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 123 9031, F01L 134, F02D 1302

Patent

active

056261098

ABSTRACT:
A valve timing control apparatus that adjusts valve overlap by altering valve timing according to the running condition of the engine. A variable valve timing mechanism (VVT) alters the valve timing of intake valves to adjust the valve overlap. An electronic control unit (ECU) controls the VVT with respect to a target value calculated in accordance to the running condition of the engine to obtain the optimum valve overlap. The ECU controls the VVT to eliminate valve overlap under low temperature conditions. The ECU controls the VVT to switch from a state of nonexistent valve overlap to a valve overlap state as the temperature changes from a low temperature to a higher temperature. The ECU judges whether the engine is in a low temperature condition based on a predetermined reference value to suppress the difference in the amount of fuel (port wet amount) adhered to the intake port before and after the shifting of the state the valve overlap.

REFERENCES:
patent: 5103780 (1992-04-01), Ishii
patent: 5280770 (1994-01-01), Satou et al.
patent: 5333577 (1994-08-01), Shinojima
patent: 5398502 (1995-03-01), Watanabe
patent: 5417191 (1995-05-01), Togai et al.
patent: 5482012 (1996-01-01), Yoshioka

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