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US 2011/0214633 A1Published application
Duration extender variable valve actuation
OwnerManousos Pattakos, John Pattakos +1inventors
InventorsManousos Pattakos, John Pattakos, Emmanouel Pattakos
Life of this patent
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Abstract
A hydro-mechanical variable valve actuation (or VVA) system that controllably extends the valve duration. The valve opens up to its maximum lift mechanically/conventionally. The hydraulic part of the system controllably retards the closing of the valve, and takes part only during the valve-closing phase.
Claims10
A variable valve actuation system comprising at least:
- a camshaft (1);
- a cam (2) mounted on said camshaft (1), said cam (2) having an opening contour (3) and a closing contour (4);
- a valve (5);
- a cam-follower valve-actuator assembly (6), said cam (2), said valve (5) and said cam-follower valve-actuator assembly (6) translate the opening contour (3) into a theoretical opening valve lift pattern (7) and the closing contour (4) into a theoretical closing valve lift pattern (8);
- a valve spring (9) for restoring said valve (5);
- an oil-chamber (10) having a release-valve (11);
- a plunger (12) slidably fitted into said oil-chamber (10), said plunger (12) being linked or embodied to said cam-follower valve-actuator assembly (6);
- a control unit (13) for controlling said release-valve (11), characterized in that:
- the valve opens following substantially the theoretical opening valve lift pattern;
- the plunger, pressed by oil trapped into the oil-chamber, retards the restoring of the valve so that the valve closes controllably retarded relative to the theoretical closing valve lift pattern, according the state of the release-valve.
7 more elements
A variable valve actuation system comprising at least:
- a valve;
- a cam dictating a basic restoring pattern for said valve to follow during valve closing;
- a hydraulic means resisting to the closing motion of said valve;
- an on-off solenoid valve, said hydraulic means applying a strong or a weak resistance to the closing motion of said valve according the state of said on-off solenoid valve,
- so that by controlling the timing of the on-off solenoid valve the actual restoring pattern of the valve extends controllably beyond the basic restoring pattern.
2 more elements
A variable valve actuation system comprising at least:
- a cam having an opening contour and a closing contour;
- a valve;
- a cam-follower valve-actuator assembly for displacing said valve under the camming action of said cam;
- said cam, said valve and said cam-follower valve-actuator assembly translate said opening contour into a theoretical opening valve lift pattern and said closing contour into a theoretical closing valve lift pattern;
- an oil-chamber having a controllable release-valve;
- a plunger slidably fitted to said oil-chamber, said plunger pressed by the oil trapped into said oil-chamber retards the valve closing, the valve opening substantially follows the theoretical valve lift pattern, whereas the actual valve closing pattern envelopes the theoretical closing pattern, so that the valve duration is controllably extended.
3 more elements
Dependencies are inferred from the claim text.