Variable compression engine with variable inlet valve timing

Details Variable compression engine with variable inlet valve timing Variable compression engine with variable inlet valve timing

2008-10-14

2010-12-28

Kamen, Noah (Department: 3783)

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

C123S0780AA, C123S090150

Reexamination Certificate

active

07856952

ABSTRACT:
An apparatus for providing two features that improve fuel economy of four stroke internal combustion engines. The first is the provision of a compression ratio which is higher than normal when the engine is operating at light load; and which varies from very high at idling, down to normal at full power. This is effected by a movable piston associated with the inlet valve and connected to the throttle. The second is the provision of variable timing as well as a variable amount of opening of the inlet valve, such that at idle, the valve opens at top center of the main piston, opens only a fraction of its full lift, and closes about 70° crankshaft past top center. As the throttle is opened, the inlet valve opens farther at each open excursion to create as little flow resistance as possible to the inlet draw. At the middle of its open excursion during each valve actuation it moves in the same direction as the crankshaft enough that as the open duration becomes greater, the valve always begins to open as the main piston starts its inlet stroke, but closes later. Finally, at full power, the inlet valve begins to open slightly before the main piston comes to top center, opens fully, and closes somewhat after the main piston has reached bottom center and has started the compression stroke.

REFERENCES:
patent: 6055948 (2000-05-01), Shiraishi et al.
patent: 6672270 (2004-01-01), Armer
patent: 6691655 (2004-02-01), Aoyama et al.
patent: 7481199 (2009-01-01), Nakamura
patent: 7506620 (2009-03-01), Yasui

Affiliated with

Also associated with

Rating

Variable compression engine with variable inlet valve timing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable compression engine with variable inlet valve timing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable compression engine with variable inlet valve timing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4151777