Vacuum system for engine with variable valve lift

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

2005-03-08

2005-03-08

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

C123S090150, C123S399000

Reexamination Certificate

active

06863048

ABSTRACT:
A vacuum system for an engine with variable valve lift includes a controllable vacuum-forming valve at the entrance to the intake manifold and a programmable engine control module (ECM) to increase vacuum as desired within the manifold by modulating the valve as needed to optimize fuel economy. To provide vacuum brake assist, a brake booster diaphragm is connected conventionally to the manifold and a vacuum storage tank and check valve are disposed between the booster diaphragm and the manifold. During periods of vehicle deceleration, when engine load is low, the ECM may switch the VVL-controlled intake valves to a higher lift to increase the pumping capacity of the engine, while simultaneously partially closing the vacuum-forming valve to create vacuum in the intake manifold, the brake booster, and the vacuum storage tank at little or no expense to engine performance.

REFERENCES:
patent: 4608825 (1986-09-01), Fontaine
patent: 5826559 (1998-10-01), Ichimoto 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: 6571782 (2003-06-01), Brosseau et al.

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