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NOx sensor mounting position identification method and device, vehicle and medium

A technology of installation location and identification method, which is applied in the field of sensor identification, can solve the problems of cumbersome steps and long time consumption, and achieve the effect of simple judgment and increased production cost

Pending Publication Date: 2022-05-24
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a NOx sensor installation position identification method, device, vehicle and medium to solve the problem of three NOx sensors included in the current double-injection SCR post-treatment system Position judgment, time-consuming, and cumbersome steps

Method used

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  • NOx sensor mounting position identification method and device, vehicle and medium
  • NOx sensor mounting position identification method and device, vehicle and medium
  • NOx sensor mounting position identification method and device, vehicle and medium

Examples

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Embodiment 1

[0041] figure 1 The first embodiment of the present invention provides a flowchart of a method for identifying the installation position of a NOx sensor. This embodiment can be applied to the situation of identifying the installation position of the NOx sensor in the dual-injection SCR system. The method for identifying the installation position of the NOx sensor can be used. Executed by the NOx sensor installation position identification device, the NOx sensor installation position identification device can be implemented in the form of hardware and / or software, and the NOx sensor installation position identification device can be configured in a vehicle with a dual-injection SCR system.

[0042] The engine post-treatment adopts the dual-injection SCR system. For details on the structure of the dual-injection SCR system and the arrangement of the NOx sensor, see figure 2 As shown, a plurality of NOx sensors are installed in sequence along the flow direction of the exhaust ga...

Embodiment 2

[0058] Figure 4 This is a flowchart of a method for identifying an installation position of a NOx sensor provided in Embodiment 2 of the present invention. This embodiment provides a preferred embodiment on the basis of the foregoing embodiment. like Figure 4 As shown, the method for identifying the installation position of the NOx sensor includes:

[0059] S410. After T15 is powered on, the ECU broadcasts the battery voltage through a CAN message.

[0060] Among them, CAN (Controller Area Network, Controller Area Network) is one of the most widely used field buses in the world.

[0061] The sender and receiver of the CAN message identify the message by the message ID. The message ID is pre-agreed in the CAN protocol. For example, the ID of 0x18FF0051 is used to represent the signal sent by the upstream NOx sensor, and the ECU also uses this ID. Identification reads the signal sent by the upstream NOx sensor.

[0062] In this embodiment, after T15 is powered on, the ECU ...

Embodiment 3

[0078] Figure 5 This is a schematic structural diagram of a device for identifying the installation position of a NOx sensor provided in Embodiment 3 of the present invention. The engine aftertreatment adopts a dual-injection SCR system, and multiple NOx sensors are installed in sequence along the flow direction of the engine exhaust, such as Figure 5 As shown, the NOx sensor installation position identification device includes:

[0079] The pin information acquisition module 510 is used for acquiring the corresponding pin supply voltages of a plurality of the NOx sensors and the pin wiring mode of each pin of the NOx sensors;

[0080]The installation position identification module 520 is configured to respectively determine the installation position of the NOx sensor in the dual-injection SCR system according to the pin supply voltage and the pin wiring mode.

[0081] Optionally, the pin wiring mode is that the connector of the NOx sensor has four wires or five wires;

...

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Abstract

The invention discloses a NOx sensor mounting position identification method and device, a vehicle and a medium. The method comprises the following steps: acquiring pin power supply voltages corresponding to a plurality of NOx sensors and a pin wiring mode of each pin of the NOx sensors; and according to the pin power supply voltage and the pin wiring mode, the installation position of the NOx sensor in the double-spraying SCR system is determined. The problems that at present, NOx sensor installation position recognition needs to achieve position judgment by means of a urea nozzle, a urea pump and other parts, time is long, steps are tedious, and in addition, tedious judgment logic needs to be added in an ECU and the sensor are solved, mistake proofing is not needed for NOx sensor installation, the manufacturing cost of the NOx sensor is not increased, and the NOx sensor installation speed is high. And the identification logic judgment of the mounting position of the NOx sensor is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of sensor identification, in particular to a method, device, vehicle and medium for identifying the installation position of a NOx sensor. Background technique [0002] In the aftertreatment of diesel engine exhaust, the SCR system is used to optimize the fuel injection and combustion process, try to control the generation of particulate PM inside the engine, and then treat the nitrogen oxides formed under the oxygen-enriched condition outside the engine, and use urea for vehicles (vehicle urea) in time. Urea decomposes at a certain temperature to generate ammonia) to selectively catalytically reduce nitrogen oxides (NOx), so as to achieve both energy saving and emission reduction purposes. [0003] At present, the two NOx sensors installed in the National VI after-treatment structure are distinguished by different wiring methods. In addition, for the three NOx sensors included in the existing dual-injection...

Claims

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Application Information

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IPC IPC(8): F01N11/00G01R19/00G01R19/10
CPCF01N11/00G01R19/0084G01R19/10F01N2560/026Y02T10/40Y02A50/20Y02T10/12
Inventor 耿宗起董辉吕志华李敏褚召丰
Owner WEICHAI POWER CO LTD
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