Temperature rise control system and control method for diesel engine exhaust aftertreatment device

Abstract

The invention relates to a control system and a control method for temperature rising of a diesel engine exhaust aftertreatment device. A signal input end of an ECU is respectively connected with a diesel engine speed signal output end, a voltage multiplying signal output end of the diesel engine exhaust aftertreatment device, a temperature signal output end of a temperature rising device of the aftertreatment device, a signal output end of a pressure sensor of an air storage tank of an air compressor, and an oil tank oil quantity liquid level signal output end. A signal output end of the ECU is respectively connected with a switch signal control end of an oil supply pump, a switch signal control end of a multipath air valve, and a switch signal control end of a temperature rising controller. An outlet of an oil tank is communicated with an inlet of the oil supply pump through an oil conveying pipe, an outlet of the oil supply pump supplies oil to the temperature rising device of the aftertreatment device through an oil conveying pipe, air inlets of the multipath air valve are in parallel connection to be communicated and communicated with an outlet of the air storage tank of the air compressor, and air outlets of the multipath air valve are in parallel connection to be communicated to supply oxygen to the temperature rising device of the aftertreatment device.

Description

technical field [0001] The invention relates to an ECU intelligently controls the distribution of fuel and oxygen according to the working condition of the diesel engine exhaust post-processing device, and maintains the combustion temperature at a set value. The temperature rise control system and control method of the diesel engine exhaust post-processing device belong to Manufacturing field of diesel engine exhaust after-treatment device and control method. Background technique [0002] CN101178020A, [0003] The name "diesel engine exhaust emission purification system" is composed of a diesel engine exhaust particulate filter with a wall flow filter, a mixed gas pipeline, a combustion air pipeline, and an electronic control unit. It is characterized in that it is located at the engine exhaust port A sensor for measuring pressure, a temperature sensor installed on the burner, and a temperature sensor respectively installed in front of and behind the exhaust particulate fi...

AI Technical Summary

Problems solved by technology

Its shortcomings: First, the diesel engine exhaust emission purification system purifies the diesel fuel by controlling the ignition coil to control the spark plug to realize the ignition of the diesel oil. Not only the reliability is subject to the composition of the circuit structure, but also the condition of the spark plug itself. The reliability is poor; the second is that the system cannot ignite diesel oil in a low-temperature state, especially in the sub-zero state, under the condition of tens of degrees below zero, it is impossible to achieve low-temperature ignition; the third is that ignition failure directly produces secondary environmental pollution

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