Apparatus for estimating quantity of intake air for internal combustion engine
First Claim
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1. An intake-air quantity estimation apparatus for an internal combustion engine, comprising:
- an intake-air quantity estimation device that includes a cylinder pressure estimation device that estimates pressure within a cylinder through calculation using a model of the cylinder obtained based on a law of conservation of energy, the intake-air quantity estimation device estimates a cylinder intake-air quantity based on the estimated pressure within the cylinder, the cylinder intake-air quantity representing the amount of air flowing into the cylinder, whereinthe model of the cylinder to be used by the cylinder pressure estimation device is configured based on an expression dPc/dt=(κ
·
R·
Tm/Vc)·
mc−
(κ
·
Pc/Vc)·
(dVc/dt), where Pc is pressure within the cylinder, κ
is the ratio of specific heat, R is a gas constant, Tm is a temperature of air flowing into the cylinder, Vc is a cylinder volume, and mc is a cylinder intake-air flow rate representing a flow rate of air flowing into the cylinder.
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Abstract
An intake-air quantity estimation apparatus for an internal combustion engine, including an intake-air quantity estimation device that includes a cylinder pressure estimation device that estimates pressure within a cylinder through calculation using a model of the cylinder obtained based on a law of conservation of energy, the intake-air quantity estimation device estimates a cylinder intake-air quantity based on the estimated pressure within the cylinder, the cylinder intake-air quantity representing the amount of air flowing into the cylinder.
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Citations
14 Claims
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1. An intake-air quantity estimation apparatus for an internal combustion engine, comprising:
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an intake-air quantity estimation device that includes a cylinder pressure estimation device that estimates pressure within a cylinder through calculation using a model of the cylinder obtained based on a law of conservation of energy, the intake-air quantity estimation device estimates a cylinder intake-air quantity based on the estimated pressure within the cylinder, the cylinder intake-air quantity representing the amount of air flowing into the cylinder, wherein the model of the cylinder to be used by the cylinder pressure estimation device is configured based on an expression dPc/dt=(κ
·
R·
Tm/Vc)·
mc−
(κ
·
Pc/Vc)·
(dVc/dt), where Pc is pressure within the cylinder, κ
is the ratio of specific heat, R is a gas constant, Tm is a temperature of air flowing into the cylinder, Vc is a cylinder volume, and mc is a cylinder intake-air flow rate representing a flow rate of air flowing into the cylinder. - View Dependent Claims (2, 3)
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4. An intake-air quantity estimation apparatus for an internal combustion engine, comprising:
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an intake-air quantity estimation device that includes a cylinder pressure estimation device that estimates pressure within a cylinder through calculation using a model of the cylinder obtained based on a law of conservation of energy, the intake-air quantity estimation device estimates a cylinder intake-air quantity based on the estimated pressure within the cylinder, the cylinder intake-air quantity representing the amount of air flowing into the cylinder, wherein the model of the cylinder to be used by the cylinder pressure estimation device is configured based on an expression dPc/dt=(κ
·
R·
Tm/Vc)·
mc−
(κ
·
Pc/Vc)·
(dVc/dt)+(κ
−
1)·
Q/Vc, where Pc is pressure within the cylinder, κ
is the ratio of specific heat, R is a gas constant, Tm is a temperature of air flowing into the cylinder, Vc is a cylinder volume, mc is a cylinder intake-air flow rate representing a flow rate of air flowing into the cylinder, and Q is a heat quantity to be transmitted between the cylinder and an exterior of the cylinder. - View Dependent Claims (5, 6)
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7. An intake-air quantity estimation apparatus for an internal combustion engine, comprising:
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an intake-air quantity estimation device that includes a cylinder pressure estimation device that estimates pressure within a cylinder through calculation using a model of the cylinder obtained based on a law of conservation of energy, the intake-air quantity estimation device estimates a cylinder intake-air quantity based on the estimated pressure within the cylinder, the cylinder intake-air quantity representing the amount of air flowing into the cylinder, wherein the intake-air quantity estimation device is configured so as to obtain a cylinder intake-air flow rate representing a flow rate of air flowing into the cylinder by use of an intake valve model associated with air passing through an intake valve and obtained based on the law of conservation of energy, a law of conservation of momentum, and a law of conservation of mass, and to estimate the cylinder intake-air quantity based on the obtained cylinder intake-air flow rate. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An intake-air quantity estimation apparatus for an internal combustion engine, comprising:
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an intake-air Quantity estimation device that includes a cylinder pressure estimation device that estimates pressure within a cylinder through calculation using a model of the cylinder obtained based on a law of conservation of energy, the intake-air quantity estimation device estimates a cylinder intake-air quantity based on the estimated pressure within the cylinder, the cylinder intake-air quantity representing the amount of air flowing into the cylinder, wherein the cylinder pressure estimation device is configured so as to estimate pressure within the cylinder in accordance with an expression obtained by solving, while a cylinder volume is assumed to be constant, an expression representing the model of the cylinder, and an expression obtained by solving, while a flow rate of air flowing into the cylinder is assumed to be 0, the expression representing the model of the cylinder.
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Specification