A post-processing temperature control method and system

Abstract

The invention belongs to the technical field of automobile exhaust post-processing, and particularly relates to a post-processing temperature control method and system. The post-processing temperaturecontrol method comprises the steps that an engine speed, an oil quantity, a DOC inlet temperature value and a DOC outlet temperature value are obtained; a DOC target temperature value is Obtained byusing looking-up a table according to the engine speed and the oil quantity; the DOC inlet temperature difference value is obtained by subtracting the DOC outlet temperature value from the DOC targettemperature value; the first far-backward fuel injection quantity is obtained from the DOC inlet temperature difference value and the DOC inlet temperature value; and the engine required far-backwardfuel injection quantity is output to an engine according to the first far-backward r fuel injection quantity, the engine demand is outputted to. According to the post-processing temperature control method and system, the temperature control error during post-processing is reduced.

Description

technical field [0001] The invention belongs to the technical field of after-treatment of automobile exhaust, and in particular relates to a method and system for controlling the temperature of the after-treatment. Background technique [0002] In order to make light-duty diesel engines meet Euro V emission requirements, DOC+DPF post-treatment technology is the main route for light-duty diesel vehicles to meet emission standards. DOC (Diesel Oxidation Catalyst, Oxidation Catalyst) is used to oxidize HC and CO in the exhaust gas, while increasing the exhaust temperature, DPF (Diesel Particulate Filter, diesel particulate filter) is an effective way to reduce engine PM (particulate matter, particulate matter) emissions way, but the DPF has a certain limit in particle capture capacity, and needs to be regenerated after the capture is full, and the temperature control of entering the DPF during regeneration is an important part of calibration. [0003] Such as figure 1 Shown i...

AI Technical Summary

Problems solved by technology

[0004] However, the deviation between the actual measured value of the sensor and the target value is used as the adjustment amount to gradually approach the target value; there is a problem that, from the injection of the far rear oil quantity to the conversion into the measured value of the second temperature sensor T5, the intermediate conversion path is long and the process There is no control, resulting in large errors, and there is a risk of over-temperature during the temperature control process

Images