Internal combustion engine with variable camshaft timing and variable duration exhaust event
First Claim
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1. A reciprocating four-stroke cycle internal combustion engine having a cylinder block with at least one cylinder, a piston, a crankshaft, a connecting rod joining the piston and the crankshaft, an intake manifold, and intake and exhaust poppet valves servicing the cylinder, with said engine further comprising:
- a cylinder head mounted upon the cylinder block so as to close the cylinder;
a camshaft for actuating said intake and exhaust valves;
a camshaft drive for rotating the camshaft and for adjusting the rotational timing of the camshaft with respect to the crankshaft, with the camshaft having a base timing;
a variable exhaust valve operating system for changing the duration of the exhaust valve opening; and
a controller for operating the camshaft drive and the exhaust valve operating system so as to control both the timing of the camshaft and the duration of the exhaust valve opening.
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Abstract
A reciprocating four-stroke internal combustion engine includes a variable exhaust valve operating system for changing the duration of an exhaust valve opening event and also a camshaft drive for rotating a valve operating camshaft and adjusting the rotational timing of the camshaft with respect to the crankshaft.
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Citations
15 Claims
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1. A reciprocating four-stroke cycle internal combustion engine having a cylinder block with at least one cylinder, a piston, a crankshaft, a connecting rod joining the piston and the crankshaft, an intake manifold, and intake and exhaust poppet valves servicing the cylinder, with said engine further comprising:
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a cylinder head mounted upon the cylinder block so as to close the cylinder; a camshaft for actuating said intake and exhaust valves; a camshaft drive for rotating the camshaft and for adjusting the rotational timing of the camshaft with respect to the crankshaft, with the camshaft having a base timing; a variable exhaust valve operating system for changing the duration of the exhaust valve opening; and a controller for operating the camshaft drive and the exhaust valve operating system so as to control both the timing of the camshaft and the duration of the exhaust valve opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operating a reciprocating four-stroke cycle internal combustion engine having a cylinder block with at least one cylinder;
- a cylinder head;
a piston;
a crankshaft;
a connecting rod joining the piston and the crankshaft;
an intake manifold;
a camshaft;
intake and exhaust poppet valves operated by the camshaft;
a camshaft drive for rotating the camshaft and for adjusting the rotational timing of the camshaft with respect to the crankshaft;
a variable exhaust valve operating system for changing the duration of the exhaust valve opening independently of camshaft timing; and
a controller for operating the camshaft drive and the exhaust valve operating system, with said method comprising the steps of;sensing a plurality of engine operating parameters, including at least engine speed; determining engine load; and controlling camshaft timing and exhaust valve duration in response to the values of said sensed engine parameters and said determined engine load so as to control the residual fraction of exhaust gas within the engine'"'"'s cylinder. - View Dependent Claims (10, 11, 12)
- a cylinder head;
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13. A reciprocating four-stroke cycle internal combustion engine having a cylinder block with at least one cylinder, a piston, a crankshaft, a connecting rod joining the piston and the crankshaft, an intake manifold, and intake and exhaust poppet valves servicing the cylinder, with said engine further comprising:
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a cylinder head mounted upon the cylinder block so as to close the cylinder;
a camshaft for actuating said intake and exhaust valves;a camshaft drive for rotating the camshaft and for adjusting the rotational timing of the camshaft with respect to the crankshaft, with the camshaft having a base timing; a variable exhaust valve operating system for changing the duration of the exhaust valve opening independently of camshaft timing; and a controller for operating the camshaft drive and the exhaust valve operating system so as to control both the timing of the camshaft and the duration of the exhaust valve opening, with the controller operating the camshaft drive and the exhaust valve operating system such that the camshaft timing will generally be retarded at lower to medium engine loads and the exhaust valve will be operated with a relatively shorter duration at lower engine speeds accompanied by either low or high load and with a relatively longer duration at lower speeds accompanied by medium load and at higher engine speeds at all loads. - View Dependent Claims (14, 15)
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Specification