Method and means for determining air mass in a crankcase scaveng

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

1990-02-08

1990-09-25

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

123478, G01M 1500

Patent

active

049585169

ABSTRACT:
A method and apparatus are described for determining the mass of air available for combustion within a cylinder of a crankcase scavenged two-cycle engine, without the use of a mass-air flow sensor. This is achieved by estimating the mass of air under compression within a crankcase chamber, prior to its transfer to a cylinder combustion chamber. The estimate for air mass is based upon the integration of crankcase pressure over the interval of decreasing crankcase volume, while air within the crankcase is under compression. The volume of the air within the crankcase chamber is derived as a function of engine cycle position, with crankcase air temperature being derived as a function of intake air temperature. Air pressure during compression is monitored with a crankcase pressure sensor. The estimate for air mass is corrected to account for air leakage and incomplete transfer of the air between the crankcase and combustion chambers.

REFERENCES:
patent: 4402294 (1983-09-01), McHugh et al.
patent: 4446523 (1984-05-01), Reinke
patent: 4461260 (1984-07-01), Nonaka et al.
patent: 4664090 (1987-05-01), Kabasin
patent: 4750352 (1988-06-01), Kolhoff
patent: 4788854 (1988-12-01), Javaherian
patent: 4846132 (1989-07-01), Binnewies

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