Patent ID: 9051867
Filing Date: 2015-06-09
Classification: F01N,Y02T

Abstract:
1. A method of detecting malfunctions in a system for providing hydrocarbons to an engine exhaust for regenerating a diesel particulate filter within an exhaust system of a diesel engine, the diesel engine comprising an electronic control module, at least one cylinder, and at least one fuel injector in fluid communication with the at least one cylinder, and a diesel oxidation catalyst within the exhaust system, the method comprising: monitoring flow rate of exhaust gas through the exhaust system and generating a signal to the electronic control module representative of the flow rate of exhaust gas passing through the system; monitoring temperature of a diesel oxidation catalyst input and generating a signal to the electronic control module representative of the temperature of the diesel oxidation catalyst input; monitoring temperature of a diesel oxidation catalyst output and generating a signal to the electronic control module representative of the temperature of the diesel oxidation catalyst output; monitoring temperature of a diesel particulate filter output and generating a signal to the electronic control module representative of the temperature of the diesel particulate filter output; the electronic control module being structured to process the flow rate, diesel oxidation catalyst input temperature, diesel oxidation catalyst output temperature, and diesel particulate filter output temperature signals and determining an average efficiency of converting hydrocarbons within the diesel oxidation catalyst into heat; the electronic control module structured to compare the determined efficiency of combustion of hydrocarbons within the diesel oxidation catalyst to a predefined efficiency; and the electronic control module structured to generate an alarm signal when the difference in the determined average efficiency is above a first predetermined limit and below a second predetermined limit.