Internal-combustion engines – Charge forming device – Auxiliary air or oxygen added to combustible mixture
Reexamination Certificate
2004-09-07
2008-07-22
Wolfe, Jr., Willis R. (Department: 3747)
Internal-combustion engines
Charge forming device
Auxiliary air or oxygen added to combustible mixture
C123S704000
Reexamination Certificate
active
07401602
ABSTRACT:
The present apparatus calculates a mass ma (mass ratio ma/mf) of mixing-gas-forming cylinder interior gas, which is a portion of cylinder interior gas to be mixed with a forefront portion of injected fuel vapor having a mass of mf, on the basis of a predetermined empirical formula. Subsequently, under the assumption that heat exchange with the outside does not occur, the apparatus calculates an adiabatic gas mixture temperature Tmix of the gas mixture forefront portion on the basis of the heat quantity of the fuel vapor having a mass of mf and the heat quantity of the mixing-gas-forming cylinder interior gas having a mass of ma. Subsequently, in consideration of an amount of heat that the gas mixture forefront portion receives from peripheral cylinder interior gas mainly via a circumferential surface thereof, the apparatus estimates a final gas mixture temperature Tmixfin of the gas mixture forefront portion (i.e., the temperature of the gas mixture) in accordance with the equation Tmixfin=Tmix (1−Kex)+Ta Kex, where Ta represents cylinder interior gas temperature, and Kex represents a heat exchange coefficient (0<Kex<1).
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Y. Wakuri et al; “Studies on the Penetration of Fuel Spray of Diesel Engine”; The Transactions of the Japanese Society of Mechanical Engineers, 1959; pp. 820-826.
Ibuki Taku
Nakayama Shigeki
Hoang Johnny H.
Toyota Jidosha & Kabushiki Kaisha
Wolfe, Jr. Willis R.
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