Ngk Spark Plug Company, Limited

Yuichi Goto

Yoshinori Inoue

Kaoru Hisada

Katsunori Yazawa

Ryosuke Noda

Toshio Nakanishi

A particulate measurement apparatus comprises a control section, which provisionally determines in an anomaly determination process that a corona core wire is in a short anomaly state when a linear voltage is equal to or lower than a particular voltage value and increments a sensor anomaly counter CNS or a chassis anomaly counter. The control section determines that the corona core wire is in a short anomaly state when the count value of one of the anomaly counters is equal to or greater than a determination threshold.

Particulate measurement apparatus and particulate measurement system

In a particulate measurement apparatus () of a particulate measurement system (), a control section () provisionally determines in an anomaly determination process at Sthat a corona core wire () is in a wire-breakage anomaly state; namely, that the corona core wire () is broken, when a corona low-side current Cis equal to or smaller than a current determination value Cand increments a wire-breakage anomaly counter CNB at SThe control section () determines that the corona core wire () is in the wire-breakage anomaly state at Swhen the count value of the wire-breakage anomaly counter CNB is equal to or greater than a wire-breakage determination threshold Cth; namely, that the result of the determination at Sis 'Yes'.

A particulate measurement apparatus controls a particulate sensor which includes an ion generation section (), an exhaust gas electrification section (), an ion trapping section (), and a second electrode (). The second electrode () is maintained at a potential repulses the ions to assist the trapping of the ions at the ion trapping section (). The particulate measurement apparatus includes a second isolation transformer (b) and an auxiliary electrode current measurement circuit (). The second isolation transformer (b) applies a voltage to the second electrode () through a second wiring line (). The auxiliary electrode current measurement circuit () detects an auxiliary electrode current Iflowing to the second wiring line (). The particulate measurement apparatus determines at least one of the state of the particulate sensor and the state of the second wiring line () based on the auxiliary electrode current I.

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Konan, Japan

Yuichi Goto