Exhaust temperature heat management method, device and system

Abstract

The invention relates to an exhaust temperature heat management method, device and system. The exhaust temperature heat management method is applied to an engine with an exhaust butterfly valve; whether the exhaust temperature heat management is performed or not is judged according to a temperature signal before a DOC (Diesel Oxidation Catalyst); if needed, the opening degree and the number of times of a near post injection of the exhaust butterfly valve are controlled according to the engine operating conditions, mainly including engine rotational speed and load, and a temperature before theDOC is rapidly increased through cooperative control on the opening degree and the number of times of a near post injection of the exhaust butterfly valve, so that the exhaust temperature is rapidly raised, the exhaust temperature requirements based on far post injection in the cylinder during DPF (Diesel Particulate Filter) active regeneration are met, and the active regeneration efficiency basedon far post injection in the cylinder is improved.

Description

technical field [0001] The present invention relates to the technical field of engine aftertreatment, and in particular to an exhaust temperature heat management method, device and system. Background technique [0002] In order to make diesel engines meet the emission requirements of the industry, DOC (Diesel Oxidation Catalyst, Oxidation Catalyst) and DPF (Diesel Particulate Filter, Diesel Particulate Filter) after-treatment technologies have developed into mainstream routes, especially based on in-cylinder remote rear injection A development route of the engine. Among them, DOC is used to oxidize HC and CO in exhaust gas while increasing exhaust temperature, and DPF is an effective way to reduce engine particulate matter emissions. [0003] See figure 1 , figure 1 It is the engine structure in the prior art, including: high-pressure common rail diesel engine 11, intake throttle valve 12, intercooler 13, air filter 14, supercharger 15, DOC16, DPF17, DOC front temperature...

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Problems solved by technology

[0005] In view of this, the present invention provides an exhaust temperature thermal management method, device, and system to solve the problems in the prior art that the exhaust temperature thermal management effect is poor, the exhaust temperature rises slowly, and the active regeneration efficiency of the DPF is low.

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