Vacuum management system for engine with variable valve lift

Details Vacuum management system for engine with variable valve lift Vacuum management system for engine with variable valve lift

2005-03-15

2005-03-15

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

C123S090150, C123S520000, C123S568210

Reexamination Certificate

active

06866020

ABSTRACT:
A vacuum management system for an engine with variable valve lift includes a vacuum control valve at the entrance to the intake manifold to increase vacuum within the manifold as needed and preferably only when it can be done without impairing fuel economy or engine performance. Vacuum may then be used for any of various vacuum-assisted devices and functions, for example, boosting a vehicle braking system. The numerical relationships among important operating parameters are determined in a laboratory, and a programmable engine control module (ECM} is provided with algorithms and tables of such values by which the ECM is able to vary valve lift and vacuum control valve position to provide optimum flow across the intake valves and optimum manifold vacuum under all engine operating conditions.

REFERENCES:
patent: 6009862 (2000-01-01), Wanat et al.
patent: 6250283 (2001-06-01), Russell et al.
patent: 6397814 (2002-06-01), Nagaishi et al.
patent: 6412455 (2002-07-01), Ogiso et al.
patent: 6439175 (2002-08-01), Arai et al.
patent: 6546910 (2003-04-01), Tanaka et al.
patent: 6571782 (2003-06-01), Brosseau et al.

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