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Internal combustion engine with intake and exhaust camshaft phase shifting for cylinder deactivation

  • US 5,642,703 A
  • Filed: 10/16/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 10/16/1995
  • Status: Expired due to Term
First Claim
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1. A four-stroke cycle, multi-cylinder reciprocating internal combustion engine having a crankshaft and a plurality of pistons reciprocably contained within a plurality of cylinders, said engine comprising:

  • at least one intake poppet valve and at least one exhaust poppet valve for each engine cylinder;

    a camshaft for operating said intake valves and said exhaust valves;

    a camshaft phaser coupled to said camshaft for adjusting the timing of the camshaft with respect to the rotational position of the crankshaft; and

    ,a controller, connected to said camshaft phaser, for deactivating at least some of the cylinders by operating said camshaft phaser such that for the cylinders which are to be deactivated, the camshaft timing is adjusted such that said intake valve and said exhaust valve open and close at points which are approximately symmetrical about a rotational position of the crankshaft at which the direction of motion of the cylinder'"'"'s piston changes.

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