A temperature control method for dpf tailpipe injection regeneration of in-use vehicles

Abstract

The invention discloses a temperature control method for DPF tailpipe injection regeneration of an in-use vehicle. The method includes: installing an intake air flow sensor on the intake pipe of an in-use diesel vehicle, and collecting the real-time intake air flow of the diesel engine through the intake air flow sensor. Air flow; by calibrating the conversion tailpipe injection fuel efficiency of the oxidation catalytic converter (DOC), the real-time injection quantity of the diesel engine is determined, and the real-time control of the DPF tailpipe injection regeneration temperature is realized. The invention realizes the variable control of the active regeneration temperature of the DPF, and solves the problems of complicated calibration work of the diesel vehicle in use, failure to obtain the working state of the diesel engine, and difficult adjustment of the DPF regeneration temperature.

Description

Technical field [0001] The present invention relates to the field of diesel engine aftertreatment technology, in particular to a vehicle in use DPF end pipe injection regeneration temperature control method. Background [0002] With the development of the economy, the environmental pollution caused by the internal combustion engine is becoming more and more apparent. Diesel engines are favored by the majority of users because of their strong power and good fuel economy, especially in the transportation, construction and other industries. At present, the National V emission regulations for diesel vehicles have been implemented in China, but the diesel vehicles that were previously sold in use are still in use. According to some data, by the end of 2007, the number of motor vehicles in the country has reached 310 million, and the total emission of particulate matter (PM) from motor vehicles is 509,000 tons, and from the analysis results of PM2.5 pollution sources in many large and ...

AI Technical Summary

Problems solved by technology

Since most of the fuel systems of diesel vehicles in use are mechanical pumps or electronically controlled unit pumps, when the tailpipe injection active regeneration system is actually used, parameters such as engine speed and cycle fuel consumption cannot be obtained through CAN messages, making it difficult to adjust the tailpipe injection in real time It is difficult to accurately control the regeneration temperature of the DPF due to the fuel injection quantity of the regeneration system, which affects the promotion of reducing particulate matter emissions from diesel vehicles in use

Images