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Control method for urea box unfreezing and heating states

A control method and the technology of urea tank, which are applied in the direction of electric control, exhaust treatment, mechanical equipment, etc. of exhaust treatment devices, can solve problems such as unqualified exhaust gas and failure to meet regulatory requirements, and achieve the effect of improving robustness

Active Publication Date: 2020-09-25
ANHUI JIANGHUAI NAVISTAR DIESEL ENGINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the urea tank cannot be thawed and heated within the specified time, the diesel engine will emit unqualified exhaust gas for a long time, which cannot meet the regulatory requirements

Method used

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  • Control method for urea box unfreezing and heating states

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Embodiment Construction

[0024] In this embodiment, the urea tank is thawed and heated with cooling water, and is thawed and heated by controlling whether the cooling water of the diesel engine circulates through the water cut-off solenoid valve; a method for controlling the thawing and heating state of the SCR urea tank is based on the urea tank The temperature is calculated as the input of the urea tank thawing and heating state, and the output is the duty ratio of the water cut-off solenoid valve of the urea tank, which should be composed of the diesel engine electronic control unit, the urea tank, the temperature sensor of the urea tank, the urea quality sensor, and the water cut-off solenoid valve In the selective catalytic reduction SCR system, the urea tank temperature sensor and urea quality sensor are integrated inside the urea tank, the water cut-off solenoid valve is installed outside the urea tank, and the urea quality sensor also has a temperature module inside to correct the urea concentra...

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Abstract

The invention discloses a control box for urea box unfreezing and heating states. The control method comprises the following steps: 1) judging whether a urea box needs to unfreeze or not; unfreezing if the urea box needs to unfreeze and an unfreezing condition is met until exiting an unfreezing state; 2) if an urea box temperature sensor has faults, changing an unfreezing exit condition as a timetiming way; 3) judging whether the urea box needs to heat or not, heating if the urea box needs to heat until exiting the unfreezing state; 4) if the urea box temperature sensor has faults, taking a use environment temperature as an urea box heating state enter and exit input; and 5) if the urea box is in a heating state, reporting the faults and reminding a client to maintain. The control methodcan eliminate external interference factors, and quickly and reliably accomplish unfreezing and heating of a SCR system, so that the urea box temperature meets technical requirements related to urea unfreezing in the national standards.

Description

technical field [0001] The invention belongs to the field of diesel engine aftertreatment SCR system control, in particular to a method for controlling the thawing and heating states of a urea tank. Background technique [0002] With the implementation of China VI emission regulations for heavy-duty vehicles, there are clear requirements for the low-temperature performance of the SCR system, that is, manufacturers should ensure that the urea solution can be used within 70 minutes of the vehicle starting to operate under the condition of an ambient temperature of -17°C. When the ambient temperature is lower than the freezing point of urea -11°C, especially after the vehicle has been cold soaked for more than 8 hours, the urea in the urea tank is likely to freeze in large quantities, which will affect the normal operation of the urea injection function of the SCR system. Therefore, it is necessary to thaw and heat the SCR system, including the urea tank, urea pump, urea inlet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/2006F01N3/208F01N2610/02F01N2610/1486Y02T10/12Y02T10/40
Inventor 杨海飞陈志超张金鹤胡博文倪银堤牛彦雷李昊代东波
Owner ANHUI JIANGHUAI NAVISTAR DIESEL ENGINE CO LTD
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