REGULATION OF A DIESEL EXHAUST AFTER-TREATMENT SYSTEM VIA EXHAUST ENERGY DETERMINATION

摘要

A method is disclosed for regulating an exhaust after-treatment (AT) system for a diesel engine. The method includes detecting the engine's cold start when the engine's exhaust gas flow directed into the AT system is at a temperature below a threshold value. The method also includes determining flow-rates of the engine's exhaust gas and its fuel supply. The method additionally includes determining a magnitude of exhaust gas energy using the determined exhaust gas flow-rates and the fuel supply over an elapsed time following the cold start. The method also includes integrating a detected temperature of the exhaust gas over the elapsed time and comparing the determined magnitude of exhaust gas energy with the integrated temperature. Furthermore, the method includes regulating operation of the AT system using the determined exhaust gas temperature when the determined magnitude of exhaust gas energy is within a predetermined value of the integrated exhaust gas temperature.

主权项

1. A method of regulating an exhaust after-treatment (AT) system in fluid communication with a diesel engine, the method comprising:
detecting, via a controller, a cold start of the diesel engine, wherein the engine generates a flow of exhaust gas directed via an exhaust system into the AT system at a temperature below an exhaust gas temperature threshold; determining, via the controller, a flow-rate of the exhaust gas; determining, via the controller, a flow-rate of fuel supplied to the engine; determining, via the controller, a magnitude of exhaust gas energy using the determined flow-rate of the exhaust gas and the determined flow-rate of fuel supplied to the engine over an elapsed time following the cold start of the engine; determining and communicating to the controller via a temperature probe a temperature of the exhaust gas; integrating, via the controller, the determined and communicated temperature of the exhaust gas over the elapsed time; comparing, via the controller, the determined magnitude of exhaust gas energy with the integrated temperature of the exhaust gas; and regulating, via the controller, operation of the AT system using the determined temperature of the exhaust gas when the determined magnitude of exhaust gas energy is within a predetermined value of the integrated temperature of the exhaust gas.