Variable valve timing

Details Variable valve timing Variable valve timing

1995-04-05

1996-03-05

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

12318447, 12318454, F01L 134

Patent

active

054958300

ABSTRACT:
Intake valve timing information is provided for control and diagnostics in a variable valve timing internal combustion engine application in which check valves are disposed in intake passages connecting engine cylinders to an intake plenum for impeding backflow out of the intake passages and into the intake plenum, by timed sampling of intake passage pressure and a determination of pressure change over an intake valve closing event indicating an amount of backflow out of the cylinder and into the intake passage. The amount of backflow indicates intake valve timing as the crank angle at the time of intake valve closing.

REFERENCES:
patent: 4986225 (1991-01-01), Wu et al.
patent: 4991547 (1991-02-01), Davis et al.
patent: 4995351 (1991-02-01), Ohkubo et al.
patent: 5018486 (1991-05-01), Davis et al.
patent: 5129367 (1992-07-01), Lee et al.
patent: 5140955 (1992-08-01), Sono et al.
patent: 5224460 (1993-07-01), Havstad et al.
patent: 5367990 (1994-11-01), Schechter
patent: 5372108 (1994-12-01), Wu

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