Engine output calculation method and engine output calculation apparatus
First Claim
1. An engine output calculation method, comprising:
- making a torque estimation model that defines a relation between indicated torque and characteristic values that indicate a flow of gas and a combustion state in an internal combustion engine;
determining a value of a parameter relating to a heat-generation rate dQ/dθ
, which is a rate of change of a heating value Q in a cylinder with respect to a crank angle θ
based on an operating condition;
calculating the heat-generation rate dQ/dθ
under a desired operating condition, using the value of the parameter; and
estimating the indicated torque of the internal combustion engine based on the torque estimation model, using the heat-generation rate dQ/dθ
.
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Abstract
The invention minimizes the man-hours required to develop a map that estimates the torque of an internal combustion engine. The method according to the invention includes making a torque estimation model that defines the relation between indicated torque and characteristic values that represent the flow of gas and the combustion state in an internal combustion engine; determining the value of a parameter that relates to a heat-generation rate (dQ/dθ), which is the rate of change in a heating value Q in a cylinder with respect to the crank angle θ, based on an operating condition of the engine; calculating the heat-generation rate under the desired operating condition; estimating the indicated torque of the internal combustion engine with the torque estimation model, using the heat-generation rate. The method according to the invention results in more accurate control over the operating state of an internal combustion engine.
32 Citations
25 Claims
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1. An engine output calculation method, comprising:
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making a torque estimation model that defines a relation between indicated torque and characteristic values that indicate a flow of gas and a combustion state in an internal combustion engine;
determining a value of a parameter relating to a heat-generation rate dQ/dθ
, which is a rate of change of a heating value Q in a cylinder with respect to a crank angle θ
based on an operating condition;
calculating the heat-generation rate dQ/dθ
under a desired operating condition, using the value of the parameter; and
estimating the indicated torque of the internal combustion engine based on the torque estimation model, using the heat-generation rate dQ/dθ
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An engine output calculation apparatus comprising:
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a model making means for making a torque estimation model that defines a relation between indicated torque and characteristic values indicating a flow of gas and a combustion state in an internal combustion engine;
a parameter determination means for determining a value of a parameter relating to a heat-generation rate dQ/dθ
that is a rate of change in a heating value Q in a cylinder with respect to a crank angle θ
, based on an operating condition;
a heat-generation rate calculation means for calculating the heat-generation rate dQ/dθ
under a desired operating condition, using the value of the parameter; and
an indicated torque estimation means for estimating the indicated torque of the internal combustion engine based on the torque estimation model, using the heat-generation rate dQ/dθ
. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An engine output calculation apparatus comprising:
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a model making portion that makes a torque estimation model that defines a relation between indicated torque and characteristic values indicating a flow of gas and a combustion state in an internal combustion engine;
a parameter determination portion that determines a value of a parameter relating to a heat-generation rate dQ/dθ
that is a rate of change in a heating value Q in a cylinder with respect to a crank angle θ
, based on an operating condition;
a heat-generation rate calculation portion that calculates the heat-generation rate dQ/dθ
under a desired operating condition, using the value of the parameter; and
an indicated torque estimation portion that estimates the indicated torque of the internal combustion engine based on the torque estimation model, using the heat-generation rate dQ/dθ
. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification