Using GPS/map/traffic info to control performance of aftertreatment (AT) devices
View Patent ↗A method for managing an exhaust aftertreatment system within a vehicle including a catalyst device includes monitoring a digital map device providing a predicted vehicle operating condition through a travel route, and determining a predicted exhaust gas temperature profile based upon the monitoring of the digital map device. Operation of the catalyst device is controlled based upon the predicted exhaust gas temperature profile.
1. Method for managing an exhaust aftertreatment system within a vehicle comprising a catalyst device, the method comprising:
monitoring a digital map device providing a predicted vehicle operating condition through a travel route;
determining a predicted exhaust gas temperature profile based upon said monitoring said digital map device; and
controlling operation of said aftertreatment system based upon said predicted exhaust gas temperature profile, said controlling comprising one of
scheduling ammonia generation in said aftertreatment system based upon predicting conditions enabling ammonia production based upon said predicted exhaust gas temperature profile,
controlling a hybrid powertrain based upon said predicted exhaust gas temperature profile to facilitate said operation of said aftertreatment system, controlling said hybrid powertrain comprising one of scheduling operation under battery power and fuel power such that fueled operation is scheduled to facilitate catalyst regeneration and scheduling operation of an electric machine of said hybrid powertrain to achieve engine operation facilitating said operation of said aftertreatment system,
scheduling operation in a first homogeneous charge compression ignition combustion mode and operation in a second combustion mode to facilitate said operation of said aftertreatment system based upon said predicted exhaust gas temperature profile, and
scheduling operation of a bypass valve to protect a temperature sensitive device of said aftertreatment system based upon said predicted exhaust gas temperature profile.
2. The method of claim 1 , wherein said catalyst device comprises a three way catalyst device, said exhaust aftertreatment system further comprises a selective catalytic reduction device, and controlling operation of said aftertreatment system further comprises managing ammonia production in said three way catalyst device for use in said selective catalytic reduction device.
3. The method of claim 2 , wherein said exhaust aftertreatment system further comprises a lean NOx trap, and said method further comprises controlling regeneration of said lean NOx trap.
4. The method of claim 1 , wherein controlling operation of said aftertreatment system further comprises utilizing an auxiliary heating device to predictively heat said catalyst device by preheating said catalyst based upon expected engine start-up to operate said catalyst device at an operational temperature at engine start-up.
5. The method of claim 4 , wherein said catalyst device comprises a selective catalytic reduction device.
6. The method of claim 5 , wherein said exhaust aftertreatment system further comprises a lean NOx trap located downstream of said auxiliary heating device.
7. The method of claim 5 , wherein said exhaust aftertreatment system further comprises a three-way catalyst device located downstream of said auxiliary heating device and upstream of said selective catalytic reduction device.
8. The method of claim 1 , wherein controlling operation of said aftertreatment system further comprises utilizing an auxiliary heating device to predictively heat said catalyst device in to maintain a minimum catalyst temperature.
9. The method of claim 8 , wherein said catalyst device is a lean NOx trap.
10. The method of claim 8 , wherein said catalyst device is a selective catalytic reduction device.
11. The method of claim 8 , wherein said catalytic device is a lean NOx trap, said exhaust aftertreatment system further comprises a selective catalytic reduction device, and said method further comprises controlling operation of said selective catalytic reduction device based upon said determining said predicted exhaust gas temperature profile.
12. The method of claim 8 , wherein said catalyst device is a three way catalyst device.
13. The method of claim 8 , wherein said vehicle includes a hybrid powertrain, and said utilizing said auxiliary heating device to predictively heat said catalyst device to maintain said minimum catalyst temperature includes heating based upon a hybrid control strategy.
14. The method of claim 8 , wherein said catalyst device is a diesel oxidation catalyst device.
15. The method of claim 14 , wherein said exhaust aftertreatment system further comprises a particulate filter device, and said method further comprises controlling regeneration of said particulate filter device.
16. The method of claim 1 , wherein controlling operation of said aftertreatment system further comprises utilizing an air induction device to predictively cool said catalyst device to maintain a maximum catalyst temperature.
17. The method of claim 1 , wherein said controlling operation of said aftertreatment system further comprises utilizing an air induction device to predictively introduce oxygenated air into said catalyst device during predicted lean engine operation to allow for favorable treatment of NOx.
18. The method of claim 1 , wherein said controlling operation of said aftertreatment system further comprises modulating engine operating modes includes retarding a spark timing.
19. The method claim 1 , wherein said controlling operation of said aftertreatment system further comprises modulating engine operating modes includes late in-cylinder fuel injection.
20. The method claim 1 , wherein said controlling operation of said aftertreatment system further comprises modulating engine operating modes includes injecting fuel into said exhaust gas flow.
21. The method of claim 1 , wherein controlling operation of said aftertreatment system further includes modulating engine operating modes to manage the exhaust gas content flowing to the catalytic device.
22. The method of claim 21 , wherein modulating engine operating modes including selecting between lean engine operation, rich engine operation, and stoichiometric engine operation among different engine cylinders.
23. The method of claim 21 , wherein modulating engine operating modes includes selectively implementing pre-mixed charge compression ignition operation.
24. The method of claim 21 , wherein modulating engine operating modes includes selectively implementing stratified charge operation.
25. The method of claim 1 , wherein controlling operation of said aftertreatment system further comprises protecting said catalyst device from thermal changes as a result of engine start/stop events.
26. The method of claim 1 , wherein controlling operation of said aftertreatment system further includes utilizing an engine start/stop strategy to modulate exhaust gas temperatures fed to said catalyst device.
27. The method of claim 1 , wherein controlling operation of said aftertreatment system further includes modulating hybrid powertrain operating modes to manage the exhaust gas content flowing to the catalytic device.
28. Method for managing exhaust gas temperatures within an exhaust aftertreatment system within a vehicle comprising a catalyst device, the method comprising:
monitoring a digital map device providing a predicted vehicle operating condition through a travel route;
determining a predicted exhaust gas temperature profile based upon said monitoring said digital map device; and
controlling operation of said aftertreatment system based upon said predicted exhaust as temperature profile, said controlling configured to achieve desired exhaust gas temperatures, said controlling comprising one of
controlling a hybrid powertrain based upon said predicted exhaust gas temperature profile to facilitate said operation of said aftertreatment system, controlling said hybrid powertrain comprising one of scheduling operation under battery power and fuel power and scheduling operation of an electric machine of said hybrid powertrain to achieve engine operation facilitating said operation of said aftertreatment system, and
scheduling operation in a first homogeneous charge compression ignition combustion mode and operation in a second combustion mode to facilitate said operation of said aftertreatment system based upon said predicted exhaust gas temperature profile.
29. The method of claim 28 , wherein controlling operation of said aftertreatment system further comprises selectively implementing electrical heating of said catalyst device to maintain a minimum catalyst temperature.
30. The method of claim 28 , wherein controlling operation of said aftertreatment system further comprises utilizing an engine start/stop strategy.
31. The method of claim 28 , wherein controlling operation of said aftertreatment system further comprises diverting exhaust gas away from said catalyst device to avoid high temperature exhaust gas reaching said catalyst device.
32. The method of claim 28 , wherein controlling operation of said aftertreatment system further comprises injecting air into the exhaust aftertreatment system to modulate high exhaust gas temperatures.
33. The method of claim 28 , wherein controlling operation of said aftertreatment system further comprises:
selectively electrically heating said catalyst device to maintain a minimum catalyst temperature;
selectively modulating engine operating modes including selecting between lean engine operation, rich engine operation, and stoichiometric engine operation;
selectively utilizing an engine start/stop strategy;
selectively diverting exhaust gas away from said catalyst device to avoid high temperature exhaust gas reaching said catalyst device; and
selectively injecting air into the exhaust aftertreatment system to modulate high exhaust gas temperatures.