Urea box fault diagnosis method and device, vehicle and storage medium

A fault diagnosis and urea tank technology, applied in the field of vehicle and storage medium, urea tank fault diagnosis, can solve problems affecting the vehicle emission performance urea tank temperature control accuracy, inability to monitor the real availability of the urea tank temperature sensor in real time, and urea state estimation errors and other problems, so as to avoid errors in urea state estimation or excessive heating time.

Inactive Publication Date: 2020-05-05
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing urea tank temperature signal fault diagnosis method is only aimed at judging the open circuit and short circuit state of the urea tank temperature sensor, and cannot monitor the actual availability of the urea tank temperature sensor in real time
When the urea tank temperature sensor is faulty, it may lead to urea state estimation errors, urea tank temperature is too high, etc., which will affect the vehicle's emission performance and the accuracy of urea tank temperature control

Method used

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  • Urea box fault diagnosis method and device, vehicle and storage medium
  • Urea box fault diagnosis method and device, vehicle and storage medium
  • Urea box fault diagnosis method and device, vehicle and storage medium

Examples

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Embodiment 1

[0030] figure 1 It is a flow chart of a urea solution tank fault diagnosis method provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation of dynamic diagnosis of a urea solution tank temperature sensor fault, and the method can be executed by a urea solution tank fault diagnosis device. The urea solution tank The fault diagnosis device can be implemented by software and / or hardware, and the urea tank fault diagnosis device can be configured on a computing device, specifically including the following steps:

[0031] Step 11. When the water heating valve of the urea tank is working normally, obtain the initial urea tank temperature when the urea tank enters the heating state through the urea tank temperature sensor.

[0032] Wherein, the water heating valve of the urea tank can be understood as a solenoid valve used to control the thawing and heating of the urea solution in the urea tank to prevent urea crystallization.

[0033] Specifi...

Embodiment 2

[0042] figure 2 It is a flow chart of a urea tank fault diagnosis method provided by Embodiment 2 of the present invention. The technical solution of this embodiment is further refined on the basis of the above-mentioned technical solution, specifically including the following steps:

[0043] Step 21. When the water heating valve of the urea tank is working normally, obtain the initial urea tank temperature when the urea tank enters the heating state through the urea tank temperature sensor.

[0044] Step 22, when the urea solution tank satisfies the preset dynamic fault judgment condition, acquire the current temperature of the urea solution tank at the current moment.

[0045]Step 23: When the difference between the current urea tank temperature and the initial urea tank temperature is less than a preset dynamic temperature limit, determine that the urea temperature detection result of the urea tank is a dynamic unreliable fault.

[0046] Among them, the dynamic unreliabl...

Embodiment 3

[0070] Figure 5 A structural diagram of a urea tank fault diagnosis device provided in Embodiment 3 of the present invention, the urea tank fault diagnosis device includes: an initial temperature acquisition module 31 , a current temperature acquisition module 32 and a detection result determination module 33 .

[0071] Wherein, the initial temperature acquiring module 31 ' is used to obtain the initial urea tank temperature when the urea tank enters the heating state through the urea tank temperature sensor when the water heating valve of the urea tank is working normally; the current temperature acquiring module 32 is used for when When the urea tank satisfies the preset dynamic fault judgment condition, obtain the current temperature of the urea tank at the current moment; the detection result determination module 33 is used to determine the urea tank according to the initial urea tank temperature and the current urea tank temperature The fault detection result of the urea...

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Abstract

The invention discloses a urea box fault diagnosis method and device, a vehicle and a storage medium. The method comprises the steps that when the water heating valve of a urea box normally works, theinitial urea box temperature of the urea box in the heating state is obtained through a urea box temperature sensor; when the urea box meets a preset dynamic fault judgment condition, the current temperature of the urea box at the current moment is obtained; and a urea box temperature sensor fault detection result of the urea box is determined according to the initial urea box temperature and thecurrent urea box temperature. According to the technical scheme, the problems that the state of the urea box temperature sensor cannot be monitored in real time, urea state estimation errors are caused by sensor faults or the urea temperature is excessively high due to too long heating time are solved, the accuracy of urea box temperature control is improved and the emission performance of the vehicle is improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of temperature signal detection, and in particular to a urea tank fault diagnosis method, device, vehicle and storage medium. Background technique [0002] In recent years, efforts to control air pollution across the country have been gradually strengthened, and the results have been remarkable, but there is still a certain distance from the expectations of the people. Especially after the heating season in the north, the smog is serious and the air quality is poor. Strengthening the management of motor vehicle emissions has been put on the important agenda. [0003] 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 solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K15/00
CPCG01K15/007
Inventor 周海早张鹏于凯王明卿撒占才
Owner FAW JIEFANG AUTOMOTIVE CO
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