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Control system for urea pump

A control system and urea pump technology, applied in the direction of electronic control, exhaust treatment, mechanical equipment, etc. of exhaust gas treatment devices, can solve the problems of high system cost and large installation space, and achieve cost reduction, simplified layout, accurate The effect of closed loop control

Inactive Publication Date: 2020-04-03
WUXI WEIFU LIDA CATALYTIC CONVERTER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The installation on the vehicle needs to design the fixed position separately, resulting in a large installation space and high system cost

Method used

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  • Control system for urea pump
  • Control system for urea pump
  • Control system for urea pump

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Experimental program
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Embodiment Construction

[0026] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0027] The control system for the urea pump proposed by the embodiment of the present invention can realize all control of the SCR post-treatment system, including urea pump pressure control, urea injection volume control, urea heating control and OBD diagnosis control of the SCR system;

[0028] The control system for the urea pump includes an input interface module, an output interface module, an SCR control module and a urea pump control module;

[0029] The input interface module is used to transmit external input signals to the SCR control module. The external input signals include: engine signal a1, exhaust temperature signal a2, ambient temperature signal a3, urea temperature signal a4, NOx concentration signal a5, external sensor OBD signal a6 , external actuator OBD signal a7, diagnostic instrument request signal a8;

[0030] The output interface modu...

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Abstract

The invention provides a control system for a urea pump. The control system for the urea pump comprises an input interface module, an output interface module, an SCR control module and a urea pump control module, wherein the input interface module is used for transferring an external input signal to the SCR control module; the output interface module is used for sending the external input signal output by the SCR control module to a related executer, a CAN communication line and a diagnostic apparatus; the SCR control module is mainly used for carrying out urea pump drive, urea injection amount calculation and urea system heating drive according to the external input signal and a feedback signal of the urea pump, and sending the external input signal to the related executer, the CAN communication line and the diagnostic apparatus through the output interface module; and the urea pump control module is mainly used for executing a pump motor drive signal of the SCR control module, a drive signal of a pump heater and a drive signal of a pumpback valve, and controlling a urea pump motor, the pump heater and the pumpback valve. The control system for the urea pump integrates an SCR control function with a urea pump control function.

Description

technical field [0001] The invention relates to the field of diesel engine aftertreatment system control, in particular to a control system for urea pumps. Background technique [0002] With the increasingly stringent emission regulations, the SCR aftertreatment system for diesel engines has become an inevitable choice to meet emission regulations. NOx emissions can be reduced below the legal limit by the SCR aftertreatment system. At present, the SCR post-treatment system mainly includes SCR catalytic converter, SCR controller, urea pump, urea nozzle, urea tank, urea pipeline and related sensors. Among them, the SCR controller mainly controls the work of the urea pump and the urea nozzle according to the sensor signal and the control strategy, so as to realize the regular and quantitative urea injection. The urea injection system receives instructions and drive signals from the controller to realize the pressure build-up and urea injection of the urea pump. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N2570/14F01N2610/02F01N2610/144F01N2610/1486Y02T10/12Y02T10/40
Inventor 苗垒陶建忠吴英标肖云龙
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER
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