Particulate matter detection device

Abstract

A particulate matter detection device (1) equipped with: a particle amount detection means (2); a temperature detection means (3) that detects the temperature of exhaust gas; a control unit (4); and a heating means (24). The particle amount detection means (2) is equipped with a particulate matter accumulation unit that accumulates a portion of the particulate matter contained in exhaust gas discharged from an internal combustion engine (5), and a pair of opposing electrodes arranged at a distance from each other on the particulate matter accumulation unit. The control unit (4) determines the amount of particulate matter accumulated in the particulate matter accumulation unit on the basis of an electrical signal output by the particle amount detection means (2), and receives information related to the exhaust gas temperature detected by the temperature detection means (3). During a cold startup of the internal combustion engine (5), the control unit (4) controls the heating means (24) so as to heat the particulate matter accumulation unit to 300-800 DEG C.

Description

technical field [0001] The present invention relates to a particulate matter detection device for detecting the amount of particulate matter contained in exhaust gas generated by an internal combustion engine. Background technique [0002] An exhaust purification device that traps particulate matter (Particulate Matter: PM) contained in exhaust gas is installed on an exhaust pipe of an internal combustion engine. This exhaust purification device includes a particulate matter detection device having a PM sensor that detects the amount of particulate matter contained in exhaust gas, and detects a failure of the exhaust purification device based on information obtained by the particulate matter detection device. [0003] The PM sensor used in the particulate matter detection device is configured in such a way that the PM sensor is heated after the detection of the particulate matter is completed and the next detection is performed, so that the particles adhering to the PM senso...

AI Technical Summary

Problems solved by technology

If the timing of the adhesion of the condensed water overlaps with the timing of heating the above-mentioned PM sensor, it may become the main cause of water-receiving cracking of the PM sensor.

Therefore, in the particulate matter detection device of Patent Document 1, heating for burning and removing the particulate matter in the PM sensor is not performed for a predetermined period of time when the internal combustion engine is cold started.

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