Valve timing control device for an internal combustion engine

Details Valve timing control device for an internal combustion engine Valve timing control device for an internal combustion engine

1995-06-01

1996-05-21

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

F01L 134

Patent

active

055179550

ABSTRACT:
A valve timing control device for an internal combustion engine. The device comprises first determination means for determining a first optimal value of the valve overlap period in the current engine operating condition, on the basis of the current engine speed and load, second determination means for determining a second optimal value of the valve overlap period in the current engine operating condition by reducing the first optimal value when the engine has not warmed up, and valve overlap period control means for controlling a valve overlap period using the first optimal value when the current degree of opening of the throttle valve is larger than a predetermined value, even if the engine has not warmed up. A back-flow of exhaust gas does not occur when the degree of the throttle valve is relatively large so that the valve overlap period at this time is made larger and a higher engine torque can be obtained to increase the trapping efficiency and the scavenging efficiency, even if the engine has not warmed up.

REFERENCES:
patent: 4324210 (1982-04-01), Aoyama
patent: 5031582 (1991-07-01), Kruger
patent: 5074260 (1991-12-01), Yagi et al.
patent: 5222465 (1993-06-01), Sakamuto et al.
patent: 5233831 (1993-08-01), Hitomi et al.
patent: 5293741 (1994-03-01), Kashiyama et al.
patent: 5333577 (1994-08-01), Shinojima
patent: 5398502 (1995-03-01), Watanabe

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