Phaser-actuated continuously variable valve actuation system with lost motion capability

a technology of continuously variable valves and phasers, applied in the direction of valve arrangements, machines/engines, mechanical equipment, etc., can solve the problems of requiring significantly more power than a conventional fixed-lift and fixed-duration valvetrain system, and the cost of a conventional engine itself, and achieve the effect of improving the performance of both spark-ignited and compression-ignited engines
US20080078345A1Inactive Publication Date: 2008-04-03DELPHI TECH INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
DELPHI TECH INC
Publication Date
2008-04-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

A system for continuously varying actuation of a valve in an internal combustion engine including a first cam for opening the valve, a second cam for closing the valve, and an oscillating rocker arm continuously engaging each of the first cam, the second cam, and the valvetrain, with the aid of a lost motion spring. The cams are disposed on first and second camshafts that are geared together. The first camshaft gear is driven by the engine crankshaft and thus is phase-invariant. The second camshaft gear is rotationally mounted on the second camshaft and supports the stator of a camshaft phaser. The phaser rotor is mounted to the second camshaft. Varying the rotor position varies the phase of the second cam and thus varies lift and closing timing of the valve. The system is useful in improving the performance of both spark-ignited and compression-ignited engines.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This present invention relates to provisional application Ser. No. 60 / 847,784, filed on Sep. 28, 2006.RELATIONSHIP TO GOVERNMENT CONTRACTS

[0002] The present invention was supported in part by a U.S. Government Contract, No. FC26-05NT42483. The United States Government may have rights in the present invention.TECHNICAL FIELD

[0003] The present invention relates to the actuation of combustion valves in internal combustion engines; more particularly, to mechanisms for variable actuation of combustion valves; and most particularly, to a system for continuously variable valve actuation.BACKGROUND OF THE INVENTION

[0004] One of the drawbacks inhibiting the introduction of a gasoline or Diesel Homogeneous Charge Compression Ignited (HCCI) engine in production has been the lack of a simple, cost effective and energy efficient Variable Valvetrain Actuation (VVA) system to vary intake events. Many electro-hydraulic and electromechanical (magnetic) “camle...

Claims

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