A control method for urea tank thawing and heating state

A control method and technology of urea tank, which is applied to the electronic control of exhaust treatment devices, machines/engines, mechanical equipment, etc., can solve problems such as unqualified exhaust gas and failure to meet regulatory requirements, and achieve the effect of improving robustness

Active Publication Date: 2021-05-04
ANHUI JIANGHUAI NAVISTAR DIESEL ENGINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A control method for urea tank thawing and heating state

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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 method for controlling the thawing and heating state of an SCR urea tank, comprising the following steps: 1) judging whether the urea tank needs to be thawed, and if so, when the thawing condition is met, thawing is carried out until the thawing state is exited; 2) if If the temperature sensor of the urea tank fails, the exit condition of thawing is changed to the time counting method; 3) Determine whether the urea tank needs to be heated, and if so, heat it until it exits the thawing state; 4) If the temperature sensor of the urea tank fails, the use environment The temperature is used as the input for entering and exiting the heating state of the urea solution tank; 5) If the urea solution tank is in the heating state, it will report a fault and prompt the customer for maintenance. The invention can eliminate external interference factors, quickly and reliably complete the thawing and heating of the SCR system, so that the temperature of the urea tank meets the technical requirements on urea thawing in the national standard.

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 Patents(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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