Estimating device for exhaust temperature in internal combustion engine
First Claim
1. An estimating device for exhaust temperature in an internal combustion engine, comprising:
- a gas sensor provided in an exhaust system of the internal combustion engine for detecting a concentration of a component in exhaust;
a heater for heating the gas sensor;
a temperature detecting unit for detecting element temperature data being one of (i) an element temperature of the gas sensor and (ii) a parameter in correlation to the element temperature;
an energization controlling unit for controlling energization of the heater by feedback controlling an amount of heater energizing operation so that the element temperature data agrees with a predetermined target;
a heat release quantity computing unit for computing a heater heat release quantity associated with the energization of the heater based on the amount of heater energizing operation that is feedback controlled by the energization controlling unit;
an estimating unit for estimating the exhaust temperature based on a balance between (i) an emitted heat quantity of the gas sensor in proportion to a temperature difference between the element temperature and the exhaust temperature and (ii) the heater heat release quantity in proportion to heater power by using at least one of (i) an emitted heat quantity-related parameter in relation to the emitted heat quantity of the gas sensor and (ii) a heat release quantity-related parameter in relation to the heater heat release quantity; and
a parameter calibrating unit for calibrating the at least one.
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Accused Products
Abstract
An intake pipe of an engine has an injector, while an exhaust pipe has an A/F (air/fuel) sensor that contains a heater. An ECU detects an element impedance of the air/fuel sensor, and computes an emitted heat quantity of the A/F sensor based on the detected element impedance. The ECU further controls energization of the heater of the A/F sensor and computes a heater release quantity associated with the energization of the heater. Furthermore, the ECU estimates exhaust temperature from a balance between the emitted heat quantity of the A/F sensor and the heater heat release quantity by using at least one of an emitted heat quantity-related parameter and a heat release quantity-related parameter. These two parameters can be calibrated.
51 Citations
22 Claims
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1. An estimating device for exhaust temperature in an internal combustion engine, comprising:
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a gas sensor provided in an exhaust system of the internal combustion engine for detecting a concentration of a component in exhaust;
a heater for heating the gas sensor;
a temperature detecting unit for detecting element temperature data being one of (i) an element temperature of the gas sensor and (ii) a parameter in correlation to the element temperature;
an energization controlling unit for controlling energization of the heater by feedback controlling an amount of heater energizing operation so that the element temperature data agrees with a predetermined target;
a heat release quantity computing unit for computing a heater heat release quantity associated with the energization of the heater based on the amount of heater energizing operation that is feedback controlled by the energization controlling unit;
an estimating unit for estimating the exhaust temperature based on a balance between (i) an emitted heat quantity of the gas sensor in proportion to a temperature difference between the element temperature and the exhaust temperature and (ii) the heater heat release quantity in proportion to heater power by using at least one of (i) an emitted heat quantity-related parameter in relation to the emitted heat quantity of the gas sensor and (ii) a heat release quantity-related parameter in relation to the heater heat release quantity; and
a parameter calibrating unit for calibrating the at least one. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An estimating device for exhaust temperature in an internal combustion engine, comprising:
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a gas sensor provided in an exhaust system of the internal combustion engine for detecting a concentration of a specific component in exhaust;
a heater for heating the gas sensor;
a temperature detecting unit for detecting element temperature data being one of the gas sensor and a parameter in correlation to the gas sensor;
an energization controlling unit for controlling energization of the heater;
a fuel quantity increasing unit for increasing a fuel supply quantity when the internal combustion engine is operated under a high load; and
a correcting unit for correcting the fuel quantity increase by the fuel quantity increasing unit based on the element temperature data detected by the temperature detecting. - View Dependent Claims (22)
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Specification