Filter failure detection device and particulate matter detection device
Number of patents in Portfolio can not be more than 2000
United States of America
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Mar 3, 2020
Grant Date -
Oct 26, 2017
app pub date -
Oct 2, 2015
filing date -
Oct 2, 2015
priority date (Note) -
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Abstract
A control unit (6) estimates an output value of a PM sensor (S2) located at a downstream side of a DPF used as a reference filter, and detects whether the estimated output value exceeds a predetermined value (S3). When the estimated output value exceeds the predetermined value (YES in S3), the control unit detects an output value of the PM sensor (S4), and a heater heats the PM sensor (S5). The control unit detects an output value of the PM sensor (S6) after the PM sensor is heated, and calculates a change ratio of the output values of the PM sensor before and after heating (S7). The control unit estimates an average particle size of PM based on the calculated change ratio (S8), and detects whether the DPF has failed based on a comparison result of a corrected output value of the PM sensor with a threshold value.
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