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Internal combustion engine with variable camshaft timing and variable duration exhaust event

  • US 5,960,755 A
  • Filed: 06/09/1998
  • Issued: 10/05/1999
  • Est. Priority Date: 06/09/1998
  • Status: Expired due to Term
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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