Control device for internal combustion engine
First Claim
1. A control device for internal combustion engine, the control device being configured to:
- determine a target value of fuel injection amount based on an operating condition of the internal combustion engine, the fuel injection amount being an amount of fuel injected in a cylinder of the internal combustion engine;
obtain a measured value, an estimated value of a target value of a parameter relevant to intake oxygen concentration, the intake oxygen concentration being an oxygen concentration of gas introduced into the cylinder;
obtain the intake oxygen concentration based on the parameter relevant to intake oxygen concentration;
obtain a measured value or an estimated value of NOx concentration of gas discharged from the cylinder, the NOx concentration being a concentration of nitrogen oxide; and
determine at least one of the following situations;
whether a difference in fuel injection amount being zero, positive or negative, the difference in fuel injection amount being a relative difference of an actual value of the fuel injection amount in reference to the target value thereof;
whether the difference in fuel injection amount being a value within a predetermined range including zero, a value larger than the maximum value in the predetermined range or a value smaller than the minimum value in the predetermined range;
whether a difference in the parameter relevant to intake oxygen concentration being zero, positive or negative, the difference in the parameter relevant to intake oxygen concentration being a relative difference of the measured value, the estimated value or the target value of the parameter in reference to an actual value thereof;
orwhether the difference in the parameter relevant to intake oxygen concentration being a value within a predetermined range including zero, a value larger than the maximum value in the predetermined range or a value smaller than the minimum value in the predetermined range,based on at least one of the following indications;
a first indication including;
an amount of change of NOx concentration difference with an increasing amount of the target value of the fuel injection amount within a predetermined range, the NOx concentration difference being a relative difference of the measured value or the estimated value of the NOx concentration in reference to a predetermined NOx referential concentration; and
the NOx concentration difference upon the target value of fuel injection amount being a predetermined first value; and
a second indication including;
an amount of change of NOx concentration difference with an increasing amount of the intake oxygen concentration within a predetermined range; and
the NOx concentration difference upon the intake oxygen concentration being a predetermined second value.
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Accused Products
Abstract
A control device for an internal combustion engine, which determines a fuel injection quantity deviation state and/or an intake oxygen concentration-related parameter deviation state on the basis of the relationship between the target value (Qtgt) of the fuel injection quantity and an NOx concentration deviation (ΔNOx) indicating the difference of the measured value or the estimate value of the NOx concentration of exhaust gas with respect to a predetermined NOx reference concentration, the control device having a state determination means for, on the basis of a first determination index including the amount of change of the NOx concentration deviation (ΔNOx) when the target value (Qtgt) of the fuel injection quantity increases within a predetermined range and the NOx concentration deviation (ΔNOx) when the target value (Qtgt) of the fuel injection quantity is a predetermined first value (Qtgt2), determining whether the fuel injection quantity deviation is zero, positive, or negative.
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Citations
21 Claims
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1. A control device for internal combustion engine, the control device being configured to:
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determine a target value of fuel injection amount based on an operating condition of the internal combustion engine, the fuel injection amount being an amount of fuel injected in a cylinder of the internal combustion engine; obtain a measured value, an estimated value of a target value of a parameter relevant to intake oxygen concentration, the intake oxygen concentration being an oxygen concentration of gas introduced into the cylinder; obtain the intake oxygen concentration based on the parameter relevant to intake oxygen concentration; obtain a measured value or an estimated value of NOx concentration of gas discharged from the cylinder, the NOx concentration being a concentration of nitrogen oxide; and determine at least one of the following situations; whether a difference in fuel injection amount being zero, positive or negative, the difference in fuel injection amount being a relative difference of an actual value of the fuel injection amount in reference to the target value thereof; whether the difference in fuel injection amount being a value within a predetermined range including zero, a value larger than the maximum value in the predetermined range or a value smaller than the minimum value in the predetermined range; whether a difference in the parameter relevant to intake oxygen concentration being zero, positive or negative, the difference in the parameter relevant to intake oxygen concentration being a relative difference of the measured value, the estimated value or the target value of the parameter in reference to an actual value thereof;
orwhether the difference in the parameter relevant to intake oxygen concentration being a value within a predetermined range including zero, a value larger than the maximum value in the predetermined range or a value smaller than the minimum value in the predetermined range, based on at least one of the following indications; a first indication including;
an amount of change of NOx concentration difference with an increasing amount of the target value of the fuel injection amount within a predetermined range, the NOx concentration difference being a relative difference of the measured value or the estimated value of the NOx concentration in reference to a predetermined NOx referential concentration; and
the NOx concentration difference upon the target value of fuel injection amount being a predetermined first value; anda second indication including;
an amount of change of NOx concentration difference with an increasing amount of the intake oxygen concentration within a predetermined range; and
the NOx concentration difference upon the intake oxygen concentration being a predetermined second value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control device for internal combustion engine, the control device being configured to:
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determine a target value of fuel injection amount based on an operating condition of the internal combustion engine, the fuel injection amount being an amount of fuel injected in a cylinder of the internal combustion engine; obtain a measured value, an estimated value or a target value of a parameter relevant to intake oxygen concentration, the intake oxygen concentration being an oxygen concentration of gas introduced into the cylinder; obtain the intake oxygen concentration based on the parameter relevant to intake oxygen concentration; obtain a measured value or an estimated value of NOx concentration of gas discharged from the cylinder, the NOx concentration being a concentration of nitrogen oxide; and determine at least one of the following situations; whether a difference in fuel injection amount being zero, positive or negative, the difference in fuel injection amount being a relative difference of an actual value of the fuel injection amount in reference to the target value thereof; whether the difference in fuel injection amount being a value within a predetermined range including zero, a value larger than the maximum value in the predetermined range or a value smaller than the minimum value in the predetermined range; whether a difference in the parameter relevant to intake oxygen concentration being zero, positive or negative, the difference in the parameter relevant to intake oxygen concentration being a relative difference of the measured value, the estimated value or the target value of the parameter in reference to an actual value thereof;
orwhether the difference in the parameter relevant to intake oxygen concentration being a value within a predetermined range including zero, a value larger than the maximum value in the predetermined range or a value smaller than the minimum value in the predetermined range, based on at least one of the following indications; a first indication including a NOx concentration difference upon the target value of fuel injection amount being a predetermined first value, the NOx concentration difference being a relative difference of the measured value or the estimated value of the NOx concentration in reference to a predetermined NOx referential concentration; and a second indication including the NOx concentration difference upon the intake oxygen concentration being a predetermined second value, the first value being employed to be at least one of;
the fuel injection amount estimated to allow the NOx concentration difference to be zero or the value within the predetermined range upon the difference in the parameter relevant to intake oxygen concentration being zero or the value within the predetermined range and the difference in fuel injection amount not being zero or the value within the predetermined range; and
the fuel injection amount estimated to allow the NOx concentration difference to be zero or the value within the predetermined range upon the difference in fuel injection amount being zero or the value within the predetermined range and the difference in the parameter relevant to intake oxygen concentration not being zero or the value within the predetermined range,the second value being employed to be at least one of;
the intake oxygen concentration estimated to allow the NOx concentration difference to be zero or the value within the predetermined range upon the difference in the parameter relevant to intake oxygen concentration being zero or the value within the predetermined range and the difference in fuel injection amount not being zero or the value within the predetermined range; and
the intake oxygen concentration estimated to allow the NOx concentration difference to be zero or the value within the predetermined range upon the difference in fuel injection amount being zero or the value within the predetermined range and the difference in the parameter relevant to intake oxygen concentration not being zero or the value within the predetermined range. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification