Method and means for determining air mass in a crankcase...

Details Method and means for determining air mass in a crankcase... Method and means for determining air mass in a crankcase...

G - Physics

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G01M 15/00 (2006.01) F02D 41/18 (2006.01) F02D 41/32 (2006.01) G01F 1/86 (2006.01) F02B 75/02 (2006.01)

Patent

CA 2029070

C-4198 METHOD AND MEANS FOR DETERMINING AIR MASS IN A CRANKCASE SCAVENGED TWO-STROKE ENGINE Abstract of the Disclosure The mass of air available for combustion within a cylinder of a crankcase scavenged two-stroke engine is obtained by estimating the mass of air trapped within a crankcase chamber, prior to its transfer to the associated cylinder combustion chamber. The estimate for air mass is derived from the product of pressure of the air in the crankcase chamber and the crankcase chamber volume at a selected engine cycle position during that portion of the engine cycle when the air is trapped and undergoes compression within the crankcase chamber divided by a factor containing the trapped air temperature at the selected engine cycle position.

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