Granted Patent B2

US 8,855,894 · App. 12/316,022 · Granted Oct 7, 2014

Abstract

Claims (25)

1. An exhaust control system for a vehicle, comprising:

an exhaust system modeling module that estimates an input gas temperature, an output gas temperature, a mass temperature, and a pressure for an exhaust system component of an exhaust system implemented in said vehicle, wherein exhaust gas flows through said exhaust system component; and

an actuator control module that selectively adjusts an engine operating parameter based on at least one of said input gas temperature, said output gas temperature, said mass temperature, and said pressure.

2. The exhaust control system of claim 1 wherein said exhaust system modeling module estimates said input gas temperature based on a second output gas temperature that is estimated for a second exhaust system component that is linked to and located upstream from said exhaust system component.

3. The exhaust control system of claim 1 wherein said exhaust system modeling module estimates an engine output temperature and estimates said input gas temperature based on said engine output temperature when said exhaust system component is an exhaust manifold.

4. The exhaust control system of claim 3 wherein said exhaust system modeling module estimates said engine output temperature based on engine load, air-per-cylinder, spark timing, equivalence ratio, ethanol concentration of fuel, engine speed, and vehicle speed.

5. The exhaust control system of claim 1 wherein said exhaust system modeling module estimates a gas temperature at a location where an exhaust gas recirculation (EGR) system is connected to an exhaust manifold and estimates said input gas temperature based on said gas temperature when said exhaust system component is an EGR system.

6. The exhaust control system of claim 1 wherein said exhaust system modeling module estimates a steady-state (SS) temperature for said exhaust system component and estimates said mass temperature based on said SS temperature and a mass coefficient determined for said exhaust system component.

7. The exhaust control system of claim 6 wherein said mass coefficient is determined based on an exhaust gas flowrate (EGF) estimated for said exhaust system component.

8. The exhaust control system of claim 7 wherein said exhaust system modeling module estimates said SS temperature based on ambient air temperature, said input gas temperature, and said EGF.

9. The exhaust control system of claim 8 wherein said exhaust system modeling module estimates said SS temperature further based on an intake air temperature and a duty cycle of power applied to a bypass when said exhaust system component is a turbocharger.

10. The exhaust control system of claim 6 wherein said exhaust system modeling module estimates heat generation when said exhaust system component is a catalyst and selectively increases at least one of said mass temperature and said SS temperature based on said heat generation.

11. The exhaust control system of claim 1 wherein said exhaust system modeling module estimates said output gas temperature based on said input gas temperature, said mass temperature, and an output coefficient determined for said exhaust system component.

12. The exhaust control system of claim 11 wherein said output coefficient is determined based on an exhaust gas flowrate (EGF) estimated for said exhaust system component.

13. The exhaust control system of claim 12 wherein said exhaust system modeling module estimates heat generation when said exhaust system component is a catalyst and selectively increases said output gas temperature based on said heat generation.

14. The exhaust control system of claim 12 wherein said output coefficient is determined further based on a duty cycle of power applied to a bypass when said exhaust system component is a turbocharger.

15. The exhaust control system of claim 1 wherein said exhaust system modeling module estimates said pressure based on a sum of a pressure increase estimated for said exhaust system component and a second pressure downstream of said pressure.

16. The exhaust control system of claim 15 wherein said exhaust system modeling module estimates said pressure increase based on an exhaust gas flowrate (EGF) estimated for said exhaust system component.

17. The exhaust control system of claim 16 wherein said exhaust system modeling module estimates said pressure increase further based on a duty cycle of power applied to a bypass when said exhaust system component is a turbocharger.

18. The exhaust control system of claim 15 wherein said second pressure is ambient air pressure when said exhaust system component is a muffler/tailpipe system.

19. The exhaust control system of claim 1 further comprising a configuration module that receives configuration data corresponding to a configuration of said exhaust system and that configures said exhaust system modeling module based on said configuration data.

20. The exhaust control system of claim 19 wherein said exhaust system modeling module is initially configured based on a generic exhaust system configuration including two exhaust manifolds, an exhaust gas recirculation (EGR) system, four turbochargers, six exhaust pipe sections, six catalysts, and two muffler/tailpipe systems.

21. The exhaust control system of claim 20 wherein said exhaust system modeling module selectively disables one or more components of said generic exhaust system configuration based on said configuration data.

22. The exhaust control system of claim 1 wherein said an exhaust system modeling module that estimates N input gas temperatures, output gas temperatures, mass temperatures, and pressures for respective ones of N different exhaust system components including said exhaust system component, wherein N is an integer greater than one, and wherein said exhaust gas flows through each of said N different exhaust system components.

23. The exhaust control system of claim 22 wherein said exhaust system includes a total of said N different exhaust system components.

Assignments (12)