Method and apparatus for determining the gas temperature in an internal combustion engine
First Claim
1. A method for determining a temperature of a gas charge in a cylinder of an internal combustion engine, the gas charge including a residual gas portion and a fresh gas portion, the method comprising the steps of:
- ascertaining a temperature of the fresh gas portion;
ascertaining a proportion of the fresh gas portion in the gas charge;
ascertaining a temperature of the residual gas portion;
ascertaining a proportion of the residual gas portion in the gas charge; and
calculating the temperature of the gas charge as a function of the temperature of the residual gas portion, the proportion of the residual gas portion in the gas charge, the temperature of the fresh gas portion, and the proportion of the fresh gas portion in the gas charge.
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Accused Products
Abstract
A method and an apparatus for determining the temperature of a gas charge in a cylinder of an internal combustion engine increase the accuracy with which the temperature of the gas charge is determined. The gas charge includes a residual gas portion and a fresh gas portion. The temperature of the gas charge is determined by ascertaining the temperature of the fresh gas portion, the proportion of the fresh gas portion in the gas charge, the temperature of the residual gas portion, and the proportion of the residual gas portion in the gas charge. The temperature of the gas charge is calculated based on these ascertained quantities.
48 Citations
9 Claims
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1. A method for determining a temperature of a gas charge in a cylinder of an internal combustion engine, the gas charge including a residual gas portion and a fresh gas portion, the method comprising the steps of:
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ascertaining a temperature of the fresh gas portion; ascertaining a proportion of the fresh gas portion in the gas charge; ascertaining a temperature of the residual gas portion; ascertaining a proportion of the residual gas portion in the gas charge; and calculating the temperature of the gas charge as a function of the temperature of the residual gas portion, the proportion of the residual gas portion in the gas charge, the temperature of the fresh gas portion, and the proportion of the fresh gas portion in the gas charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for determining a temperature of a gas charge in a cylinder of an internal combustion engine, comprising:
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an arrangement for ascertaining a temperature of the fresh gas portion; an arrangement for ascertaining a proportion of the fresh gas portion in the gas charge; an arrangement for ascertaining a temperature of the residual gas portion; an arrangement for ascertaining a proportion of the residual gas portion in the gas charge; and a calculation device for calculating the temperature of the gas charge as a function of the temperature of the residual gas portion, the proportion of the residual gas portion in the gas charge, the temperature of the fresh gas portion, and the proportion of the fresh gas portion in the gas charge.
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Specification