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Vehicle urea hydrolysis SCR system based on two-grade dynamic control

A technology of SCR system and urea for vehicles, which is applied to engine components, combustion engines, machines/engines, etc., and can solve the problems of SCR systems and control methods without urea hydrolysis

Active Publication Date: 2018-06-01
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two technologies of pyrolysis and hydrolysis for producing ammonia from urea, but the existing technology only has control methods for fixed source urea hydrolysis SCR system and vehicle urea pyrolysis SCR system, and there is no urea hydrolysis SCR system and Control Method

Method used

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  • Vehicle urea hydrolysis SCR system based on two-grade dynamic control
  • Vehicle urea hydrolysis SCR system based on two-grade dynamic control
  • Vehicle urea hydrolysis SCR system based on two-grade dynamic control

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 4 It is a structural block diagram of the DCU system of the urea hydrolysis SCR for vehicles. The microcontroller (MCU) 10 is the core component of the DCU. It samples and controls the sensors and actuators through various peripheral circuits to realize the DCU control strategy. The controller must have 7 channels of A / D modules 12, at least 3 channels of PWM output, input capture and output comparison, and at least 2 channels of high-speed CAN communication modules 11 to communicate with the vehicle ECU and the host computer respectively. Wherein, the A / D module 12 is connected with the upstream temperature sensor 21, the downstream temperature sensor 22, the hydrolysis chamber pressure sensor 23, the hydrolysis chamber temperature sensor 24, the hydrolysis chamber liquid level sensor 25, the hydrolysis chamber density...

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Abstract

The invention relates to a vehicle urea hydrolysis SCR system based on two-grade dynamic control, and belongs to the technical field of vehicles. The vehicle urea hydrolysis SCR system mainly comprises a single-chip microcomputer, and a upstream temperature sensor, a downstream temperature sensor, a hydrolysis chamber pressure sensor, a hydrolysis chamber temperature sensor, a hydrolysis chamber liquid level sensor, a hydrolysis chamber density sensor, a urea box density sensor, a urea injection metering pump, a urea reflux metering pump, an ammonia gas outlet metering valve and a whole vehicle electronic control unit respectively connected with the single-chip microcomputer. Through dynamic two-grade control policies based on engine MAP, NOx specific emissions in Europe stable-state testing circulation and Europe instant testing circulation are respectively 1.89 and 1.92 g / (kW.h); the maximum NH3 leakage is 6 ppm; and a matched diesel engine urea hydrolysis SCR aftertreatment system can be guaranteed to meet the diesel vehicle national V emission standard.

Description

[0001] The present invention is a divisional application with the application number 2017110675717, the application date of November 3, 2017, and the title of the invention "a vehicle urea hydrolysis SCR system and its control method". technical field [0002] The invention relates to the control field of a Selective Catalytic Reduction (SCR) system for a vehicle, in particular to a urea hydrolysis SCR system for a vehicle and a control method thereof. Background technique [0003] The urea hydrolysis SCR system for vehicles is installed in the exhaust system of automobiles, and can catalytically reduce NOx emitted by the engine into N through ammonia gas. 2 and H 2 O catalytic reduction device. Aqueous urea solution is often used as reducing agent in this catalytic reaction. There are two technologies of pyrolysis and hydrolysis for producing ammonia from urea, but the existing technology only has control methods for fixed source urea hydrolysis SCR system and vehicle ure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00F01N13/08
CPCF01N3/208F01N11/002F01N11/007F01N13/08Y02A50/20Y02T10/12Y02T10/40
Inventor 郭秀丽亓占丰
Owner DALIAN UNIV