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Vehicle urea tank liquid level calibration method and system and vehicle ECU

A calibration method, the technology of urea tank, applied in the field of vehicle diagnosis, can solve problems such as error-prone and time-consuming, and achieve the effect of improving efficiency

Pending Publication Date: 2021-04-30
SHANGHAI XINGRONG AUTOMOBILE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For different types of urea tanks, the matching relationship between the output value of the liquid level sensor and the actual height of the liquid level is different. However, the above matching relationship stored in the vehicle ECU is often in one-to-one correspondence with the vehicle model. When the vehicle is replaced After purchasing other types of urea tanks, the above matching relationship needs to be recalibrated by manual measurement, which is time-consuming and error-prone

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  • Vehicle urea tank liquid level calibration method and system and vehicle ECU

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Embodiment Construction

[0014] Such as figure 1 As shown, the embodiment of this specification provides a method for calibrating the liquid level of a vehicle urea tank, including:

[0015] S101. In response to the urea solution tank information input by the user, determine the first corresponding relationship between the output value of the liquid level sensor of the vehicle's urea solution tank and the actual level value, specifically, the urea solution tank information and the preset urea solution tank information can be compared with the The second corresponding relationship of the first corresponding relationship is matched, so as to determine the corresponding first corresponding relationship.

[0016] Preferably, before step S101, this embodiment further includes:

[0017] In response to the user's calibration request, an interface is provided for the user to input the information of the urea tank.

[0018] Specifically, the interface may be in the form of an option list for the user to inpu...

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Abstract

The present invention provides a vehicle urea box liquid level calibration method and system and a vehicle ECU, the corresponding relation between the output value of the liquid level sensor of the vehicle urea box and the actual liquid level value can be determined according to the urea box information input by the user, and then the urea box is calibrated according to the corresponding relation; and the problems of time consumption and high possibility of errors caused by manual measurement are avoided, and the efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of vehicle diagnosis, and in particular relates to a vehicle urea tank liquid level calibration method, system and vehicle ECU. Background technique [0002] The urea tank is used for catalytic reduction treatment of nitrogen oxides in the exhaust emissions of diesel vehicles to make them comply with emission standards and achieve the purpose of energy saving and emission reduction. At present, the more commonly used method is the SCR strategy, which uses urea aqueous solution as a reducing agent to hydrolyze to produce ammonia, and converts nitrogen oxides into clean nitrogen and oxygen under the action of a catalyst. [0003] At present, the output value of the existing urea tank liquid level sensor on the market has a one-to-one correspondence with the actual height of the liquid level in the urea tank. Convert the actual height of the liquid level. For different types of urea tanks, the matching relati...

Claims

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Application Information

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IPC IPC(8): G01F25/00
CPCG01F25/20Y02T10/40
Inventor 张健刘吉
Owner SHANGHAI XINGRONG AUTOMOBILE TECH CO LTD