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Variable compression ratio diesel engine

  • US 9,316,150 B2
  • Filed: 07/02/2013
  • Issued: 04/19/2016
  • Est. Priority Date: 07/02/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • operating a diesel opposed piston engine with a first compression ratio to supply engine power in response to a first engine load, the diesel opposed piston engine comprising a combustion chamber defined at least in part by respective crowns of two pistons each having one or more swirl canceling features and each individually coupled to one of two crankshafts, the swirl canceling features forming two pockets within the combustion chamber as the two pistons come together near a top dead center position to thereby cause inlet air delivered from an inlet port to the combustion chamber as a single flow field to be divided into separate co-rotating swirls within the two pockets, the two co-rotating swirls experiencing high shear with each other at a center of the combustion chamber as the two pistons move apart from the top dead center position; and

    changing the first compression ratio to a second compression ratio to supply engine power in response to a second engine load, the second engine load being larger than the first engine load, the second compression ratio being smaller than the first compression ratio.

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