Claims:1. A method (200) to detect ageing of an catalyst (101) in an engine
exhaust system, the exhaust system comprising at least a first
temperature sensor (102) and a second temperature sensor (103),
the first temperature sensor (102) placed upstream 5 from the catalyst
(101), the second temperature sensor (103) placed downstream
from the catalyst (101), the temperature sensors in communication
with an Electronic Control Unit (ECU (104)), the method
comprising:
10 obtaining (201) a first value of temperature from the first
temperature sensor (102);
obtaining (202) a second value of temperature from the
second temperature sensor (103);
calculating (203) a difference between said second value of
15 temperature and first value of temperature in dependence of
an odometer reading to determine ageing of the Catalyst
(101).
2. The method (200) to detect ageing of a catalyst (101) in an engine
exhaust system as claimed in claim 1, wherein the catalyst (101) is
either one of a diesel oxidation catalyst (101) or a NOx storage
catalyst (101).
3. The method (200) to detect ageing of a catalyst (101) in an engine
exhaust system as claimed in claim 1, wherein the calculation (203)
happens only when the engine exhaust system is operating in a
combustion mode.
4. The method (200) to detect ageing of a catalyst (101) in an engine
exhaust system as claimed in claim 1, wherein the difference
between said second and first value is compared 5 to a predetermined
threshold, the predetermined threshold is derived based on engine
operating parameters.
5. An electronic control unit (ECU (104)) adapted to detect ageing of
a catalyst (101) in an engine exhaust system, the exhaust system
10 comprising at least a first temperature sensor (102) and a second
temperature sensor (103), the first temperature sensor (102) placed
upstream from the catalyst (101), the second temperature sensor
(103) placed downstream from the catalyst (101), the temperature
sensors in communication with the Electronic Control Unit (ECU
15 (104)), the ECU (104) configured to:
obtain a first value of temperature from the first temperature
sensor (102);
obtain a second value of temperature from the second
temperature sensor (103);
20 calculate a difference between said second value of
temperature and first value of temperature in dependence of
an odometer reading to determine ageing of the Catalyst
(101).
6. The electronic control unit (ECU (104)) adapted to detect ageing of
a catalyst (101) in an engine exhaust system as claimed in claim 5,
wherein the catalyst (101) is either one of a diesel oxidation catalyst
(101) or a NOx storage catalyst (101).
7. The electronic control unit (ECU (104)) adapted to 5 detect ageing of
a catalyst (101) in an engine exhaust system as claimed in claim 5,
wherein the calculation happens only when the engine exhaust
system is operating in a combustion mode.
8. The electronic control unit (ECU (104)) adapted to detect ageing of
an catalyst (101) in an engine exhaust system as claimed in claim
5, wherein the difference between said second and first value is
compared to a predetermined threshold, the predetermined
threshold is derived based on engine operating parameters. , Description:The present disclosure proposes a method to detect ageing of catalyst
(101) in an engine exhaust system and an Electronic 5 Control Unit (ECU
(104)) thereof. In step 201 a first value of temperature from the first
temperature sensor (102) is obtained. In step 202, a second value of
temperature from the second temperature sensor (103) is obtained. In step
203, a difference between said second value of temperature and first value
10 of temperature is calculated in dependence of an odometer reading to
determine ageing of the Catalyst (101). The calculation happens only
when the engine exhaust system is operating in a combustion mode and
the predetermined threshold is derived based on engine operating
parameters.