Engine exhaust temperature control system and method

Abstract

The embodiment of the invention provides an engine exhaust temperature control system and method, and belongs to the field of engines. The exhaust pressure of an engine is controlled through an exhaust throttling valve (ETV) (1), in the working period of the engine, when the exhaust temperature of the engine is lower than the working temperature, the ETV (1) is controlled to reduce the opening degree, and the exhaust pressure of the engine is increased; under the conditions that a particle supplementing and collecting system of the engine accumulates a certain carbon load and needs regeneration and the exhaust temperature of the engine is lower than the regeneration exhaust temperature, the ETV (1) is controlled to reduce the opening degree, and the exhaust pressure of the engine is increased; and the exhaust pressure of the engine is increased through the ETV (1) so as to raise the exhaust temperature, and compared with the prior art where the requirements of the fuel economy regulations and the vehicle emission regulations may not be met by increasing the rear fuel injection quantity, the engine exhaust temperature control system and method have the higher environmental protection property and economical efficiency.

Description

technical field [0001] The invention relates to the field of engines, in particular to an engine exhaust temperature control system and method. Background technique [0002] With the development of social economy, the country pays more and more attention to environmental protection. In April 2016, 11 provinces in the east have implemented the national five emission standards for special vehicles (buses, sanitation, postal services). On July 1, the five-stage engine emission standard was implemented for heavy-duty diesel vehicles. On July 1, 2019, 26 cities will begin to implement the National VI emission regulations. [0003] The more severe test is the on-board emission regulations for heavy-duty diesel vehicles (a method for on-board emission testing of heavy-duty diesel vehicles during actual road driving) and fuel consumption regulations. Under the challenge, manufacturers must provide more environmentally friendly and economical engines. [0004] The current heavy-du...

AI Technical Summary

Problems solved by technology

However, the conversion efficiency of the aftertreatment system is closely related to the exhaust gas temperature. The chemical reactions involved in the aftertreatment must be carried out at a certain temperature. Therefore, if the exhaust temperature is low, the conversion efficiency of the aftertreatment system will be seriously affected. , resulting in exhaust pollutants that cannot meet regulatory requirements

[0005] In response to this situation, the current strategy adopted by automobile manufacturers is mainly to increase the amount of fuel injection to obtain a higher exhaust temperature. National VI emission regulations

Images