Doc rapid ignition heating device and method for diesel engine thermal management system

Abstract

The invention discloses a DOC quick-ignition heating device and a DOC quick-ignition heating method for a heat management system of a diesel engine. The DOC quick-ignition heating device comprises a DOC carrier, an electric heating wire, an insulating cylinder, a heat preservation cylinder, a vehicle power supply, a DOC inlet temperature sensor, a DOC outlet temperature sensor, an exhaust pipe, atemperature control module and a solid-state relay. The electric heating wire is spirally wound on the outer surface of the DOC carrier and is embedded into the inner wall of the insulating cylinder.The DOC inlet temperature sensor and the DOC outlet temperature sensor are both connected with the input end of the temperature control module; and the output end of the temperature control module isconnected with the solid-state relay. The temperature control module is used for controlling the heating power in a way of controlling the duty ratio of a PWM waveform so as to control the heating process of the DOC carrier in real time. The control method for the DOC quick-ignition heating device comprises the steps of: acquiring data; calculating the data; and implementing logic decision and execution. The DOC quick-ignition heating device disclosed by the invention solves the bottleneck problem existing in exhaust gas temperature control of the diesel engine and widens the control range ofthe exhaust gas temperature.

Description

technical field [0001] The invention relates to the field of post-treatment of diesel engine exhaust, in particular to a DOC rapid ignition heating device and method for a national VI thermal management system of a diesel engine. Background technique [0002] With the introduction of diesel engine National VI emission regulations, the requirements for diesel engine aftertreatment systems are becoming more and more stringent. In order to meet the requirements of emission regulations, the diesel engine exhaust after-treatment system must adopt the technical route of DOC-DPF-SCR (diesel oxidation catalyst-diesel particulate filter-selective catalytic reduction). [0003] The bottleneck problem encountered in the implementation of the DOC-DPF-SCR technical route is the control of the exhaust temperature of the diesel engine. Under the low load of the diesel engine, it is necessary to maintain the exhaust gas temperature to a certain value to ensure the catalytic conversion effic...

AI Technical Summary

Problems solved by technology

[0004] The difficulty encountered in the technical route of DOC oxidizing diesel to release heat to control exhaust temperature is that a certain temperature threshold is required for the catalytic oxidation reaction of DOC. The gas temperature does not reach the temperature at which DOC reacts, resulting in the failure of the temperature control strategy, which eventually deteriorates emissions and DPF cannot be safely and effectively regenerated

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