A detection method and device for diesel vehicle particulate matter sensor

Abstract

The present invention provides a diesel vehicle particle sensor detection method and device, wherein the method includes the following steps: communicating with the PM sensor to be detected, detecting the communication function of the PM sensor and generating a communication message indicating whether the communication with the PM sensor is normal Detection results; when the communication detection results show that the PM sensor communication is normal, send a work command to trigger the PM sensor to enter the regeneration execution process; during the PM sensor regeneration execution process, accept the message information of the PM sensor and process the message information Detect to generate a regeneration process detection result related to whether the regeneration process of the PM sensor is normal. The invention realizes the fault detection of the PM sensor by acquiring and analyzing the message information of the PM sensor during the regeneration process. The invention significantly improves the detection efficiency of the PM sensor and reduces the detection cost.

Description

technical field [0001] The invention relates to the field of engine testing, in particular to a detection method and device for a particle sensor of a diesel vehicle. Background technique [0002] Diesel vehicles in the National VI phase have many hardware upgrades compared with the National V phase. The particulate matter sensor for diesel vehicles is a new sensor in the National VI, hereinafter referred to as PM (Particulate Matter Sensor) sensor. [0003] An overview of the working principle of the PM sensor: the measurement output of the PM sensor is the current value, and the current value is proportional to the number of particles gathered on the sensor probe. When the current is about 0uA, it means that the probe is clean and free of particles, and the current reaches the upper limit (such as 127uA) , it means full load of particulate matter. As time increases, more carbon particles accumulate on the sensor tip, and the current increases accordingly. When there are...

AI Technical Summary

Problems solved by technology

[0004] Since the PM sensor is a brand-new diesel vehicle emission detection sensor, the market knows little about it. Once the measurement fails, the maintenance personnel cannot quickly judge whether the PM sensor itself is damaged or the signal transmission, control system and other links have failed.

In the prior art, the general practice is to remove the PM sensor to be tested and send it to the manufacturer to complete the test, or to use a bulky test platform or to use more steps to detect and judge on site, which often leads to Lead to the following problems: for example, low detection efficiency, high costs such as time and fees, poor user experience, etc.

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