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US 7,882,811 B2Granted
Methods for controlling valves of an internal combustion engine, devices for controlling the valves, and engines employing the methods
OwnerAnthony Nicholas Zurninventor
Life of this patent
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Abstract
Methods for improving the efficiency of internal combustion engines are disclosed. In one embodiment, a method of improving the efficiency of an internal combustion engine comprises controlling the motion of an exhaust valve associated with a cylinder of the internal combustion engine. Camshafts and internal combustion engines configured for performing methods of the instant invention are also disclosed.
Claims13
An internal combustion engine comprising:
- at least one cylinder;
- an intake valve associated with the at least one cylinder;
- an exhaust valve associated with the at least one cylinder;
- a piston associated with the at least one cylinder;
- a camshaft having a first exhaust lobe and a second exhaust lobe;
- the first exhaust lobe positioned on the camshaft such that the first exhaust lobe opens the exhaust valve associated with the at least one cylinder during a compression stroke of the piston;
- and
- the second exhaust lobe positioned on the camshaft such that the second exhaust lobe opens the exhaust valve during an exhaust stroke of the piston;
- wherein the internal combustion engine is configured such that during the compression stroke, a pressure of compressed air in the cylinder is substantially the same as a pressure of the internal combustion engine not having the first exhaust lobe on the camshaft.
6 more elements
An internal combustion engine comprising:
- at least one cylinder;
- an intake valve associated with the at least one cylinder;
- an exhaust valve associated with the at least one cylinder;
- a high-dome piston associated with the at least one cylinder;
- a camshaft having a first exhaust lobe and a second exhaust lobe;
- the first exhaust lobe being positioned on the camshaft at a specification between 20-30 degrees before bottom dead center and between 91-101 degrees after bottom dead center such that the first exhaust lobe opens and closes the exhaust valve associated with the at least one cylinder during a compression stroke of the high-dome piston and an amount of air compressed during the compression stroke is less than an amount of air introduced into the cylinder during an intake stroke of the high-dome piston;
- and
- the second exhaust lobe positioned on the camshaft such that the second exhaust lobe opens the exhaust valve during an exhaust stroke of the high-dome piston;
- wherein the internal combustion engine is configured such that during the compression stroke, a pressure of compressed air in the cylinder is substantially the same as a pressure of the internal combustion engine not having the first exhaust lobe on the camshaft.
6 more elements
An internal combustion engine comprising:
- at least one cylinder;
- at least one head associated with the at least one cylinder;
- an intake valve associated with the at least one cylinder;
- an exhaust valve associated with the at least one cylinder;
- a piston associated with the at least one cylinder;
- a camshaft having a first exhaust lobe and a second exhaust lobe;
- the first exhaust lobe being positioned on the camshaft at a specification between 20-30 degrees before bottom dead center and between 91-101 degrees after bottom dead center such that the first exhaust lobe opens and closes the exhaust valve associated with the at least one cylinder during a compression stroke of the piston and an amount of air compressed during the compression stroke is less than an amount of air introduced into the cylinder during an intake stroke of the piston;
- and
- the second exhaust lobe positioned on the camshaft such that the second exhaust lobe opens the exhaust valve during an exhaust stroke of the piston;
- wherein the at least one head is configured such that during the compression stroke, a pressure of compressed air in the cylinder is substantially the same as a pressure of the internal combustion engine not having the first exhaust lobe on the camshaft.
7 more elements
Dependencies are inferred from the claim text.