Method for estimating an exhaust gas temperature
AssigneeGM Global Technology Operations LLC
InventorsFederico Luigi Guglielmone, Luca Giuseppe Pairolero
Life of this patent
Estimating the term…
Abstract
A Method is provided for estimating a temperature of an exhaust gas in an exhaust line of an internal combustion engine. The exhaust line is provided with a NOx sensor that includes, but is not limited to a heater. The method includes, but is not limited to determining a value of a parameter indicative of a heat released by the heater of the NOx sensor, and of calculating a value of the temperature of the exhaust gas as a function of the determined value of this parameter.
Claims12
A method for estimating a temperature of an exhaust gas in an exhaust line of an internal combustion engine, the exhaust line comprising a NOx sensor that comprises an heater, the method comprising:
- determining, with an electronic control unit (ECU), a value of a parameter indicative of an heat released by the heater of the NOx sensor;
- and
- calculating, with the electronic control unit (ECU), a value of the temperature of the exhaust gas as a function of the value of the parameter,
- wherein the parameter is an electrical power supplied to the heater of the NOx sensor, and wherein the value of the parameter is calculated according to:
- P
- el
- =
- dc
- ·
- V
- batt
- 2
- R
- H
- ,
- wherein, Pel is the value of the electrical power supplied to the heater of the NOx sensor,
- wherein Vbatt is a value of a voltage supplied by an electrical battery connected to the heater of the NOx sensor,
- wherein dc is a duty cycle of a PWM electrical signal generated with the electrical battery and supplied to the heater of the NOx sensor, and
- wherein RH is a value of an electrical resistance of the heater of the NOx sensor.
A non-transitory computer readable medium containing a computer program product with computer instructions stored therein for causing a computer processor to perform:
- an estimation program for estimating a temperature of an exhaust gas in an exhaust line of an internal combustion engine, the exhaust line comprising a NOx sensor that comprises a heater program, the estimation program configured to:
- determine a value of a parameter indicative of an heat released by a heater of the NOx sensor;
- and
- calculate a value of the temperature of the exhaust gas as a function of the value of the parameter,
- wherein the parameter is an electrical power supplied to the heater of the NOx sensor, and wherein the value of the temperature of the exhaust gas is calculated according to:
- Texh=Ts−Rs·Pel,
- wherein Texh is the value of the temperature of the exhaust gas,
- wherein Pel is the value of the electrical power supplied to the heater of the NOx sensor,
- wherein Ts is a value of a target operating temperature of the NOx sensor, and
- wherein Rs is a value of a conversion parameter correlating the electrical power to a temperature of the NOx sensor.
An estimating apparatus for an internal combustion engine, comprising:
- an exhaust line;
- a NOx sensor;
- a heater for the NOx sensor;
- and
- a controller configured to:
- determine a value of a parameter that is indicative of heat released by the heater of the NOx sensor, and
- calculate a value of the temperature of an exhaust gas in the exhaust line as a function of the value of the parameter,
- wherein the parameter is an electrical power supplied to the heater of the NOx sensor, and wherein the value of the parameter is calculated according to:
- P
- el
- =
- dc
- ·
- V
- batt
- 2
- R
- H
- ,
- wherein, Pel is the value of the electrical power supplied to the heater of the NOx sensor,
- wherein Vbatt is a value of a voltage supplied by an electrical battery connected to the heater of the NOx sensor,
- wherein dc is a duty cycle of a PWM electrical signal generated with the electrical battery and supplied to the heater of the NOx sensor, and
- wherein RH is a value of an electrical resistance of the heater of the NOx sensor.
Dependencies are inferred from the claim text.