Ngk Spark Plug Company, Limited

Isao Suzuki

Hiroshi Inagaki

Koji Yamamoto

Katsunori Yazawa

Kazunari Kokubo

Particulate measurement processing executed by a sensor control section of a particulate measurement system includes a step of stopping voltage conversion by a first isolation transformer and a second isolation transformer, a step of obtaining correction information B, and a step of correcting ion current A through use of the correction information B. The correction information B reflects improper current generated through particulates, etc. (soot or the like) adhering to a particulate sensor. The ion current A (signal current I) is corrected through use of the correction information B, and the amount of soot S is computed through use of the corrected ion current A'. As a result, it is possible to measure the amount of the soot S (the amount of particulates) while suppressing the influence of the improper current.

Particulate measurement system

An ignition timing control device has a knocking detection unit and an ignition timing adjustment unit. In a condition that the operation state of the internal combustion engine is suitable for adjustment of the ignition timing, the ignition timing control device outputs to an igniter an adjusted ignition signal as adjusted (corrected) by an adjusted ignition timing determination process. The ignition timing control device outputs to the igniter a reference ignition signal as it is outputted from an internal combustion engine control unit without adjustment (correction) in a condition that the operation state of the internal combustion engine is not suitable for adjustment of the ignition timing.

Ignition timing control device and ignition timing control system

The present invention provides an ignition timing control device and ignition timing control system for an internal combustion engine, capable of controlling an ignition timing of the engine promptly in response to a change in engine operating conditions. An ignition timing adjustment unit () is adapted to correct the ignition timing to a proper ignition timing in a retard region with reference to a maximum advance value based on a knocking signal outputted from a knocking detection unit () and a reference ignition signal (A) outputted from an external electronic control unit (). The output signal from the ignition timing adjustment unit () can be thus promptly adjusted by retarding the ignition timing relative to a reference ignition timing given from the external electronic control unit () upon detection of engine knocking.

The present invention provides an ignition timing control device and an ignition system which are capable of performing ignition timing control that easily suppresses occurrence of knocking for internal combustion engine. An ignition timing control device has a knocking detection devicedetecting knocking of internal combustion engine; and an ignition timing adjustment deviceadjusting ignition timing of internal combustion engine according to a knocking signal obtained from knocking detection deviceand indicating knocking state and an externally-obtained signal concerning the ignition timing of the internal combustion engine. Knocking detection deviceand ignition timing adjustment deviceare electrically connected and formed integrally with each other. Ignition timing adjustment deviceis provided with a first connecting portioninputting the signal concerning the ignition timing and a second connecting portionoutputting the signal concerning the ignition timing that undergoes adjustment to a switching element

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Ichinomiya, Japan

Isao Suzuki