Honda Motor Co., Ltd.

Masahiro Fujii

Takashi Konomoto

Toru Sekiguchi

Atsuhiro Miyauchi

Daijiro Nakamura

Yuichiro Murata

Hidenori Sakai

Shuma Yatabe

An abnormality determination device of an internal combustion engine in which a breather line connects an intake-air path positioned upstream from a forced-induction system and a crankcase includes an intake-air flow rate sensor that detects an intake air flow rate in the intake-air path, a pressure sensor that detects a pressure of the breather line, and an abnormality determination unit that determines abnormality of the breather line. The abnormality determination unit estimates an intake air resistance of the intake-air path from the pressure when the engine is under low load conditions under which the intake air flow rate is less than a predetermined value and the pressure when the engine is under high load conditions under which the intake air flow rate is the predetermined value or greater and determines abnormality of the breather line when the intake air resistance is less than a threshold.

Abnormality determination device of internal combustion engine

Provided is a connection state determination device. The connection state determination device for the breather pipe determines the connection state of a breather pipe in an internal combustion engine having a supercharger, and the breather pipe is connected between an engine body including a crank case and an intake passage on the upstream side of a compressor of the supercharger, and communicates the crank case and the intake passage. The connection state determination device includes a pipe internal pressure sensor that detects the pressure inside the breather pipe, a pulsation waveform obtaining part for obtaining pulsation due to the variation of pressure inside the breather pipe as a pulsation waveform based on the detected pressure, and a connection state determination part that determines the connection state of the breather pipe based on the pulsation waveform.

Connection state determination device for breather pipe

A blockage determination portionof a blockage detection systemdetermines that no blockage has occurred in a purge line, if a flow rate V of an inner fluid Fi exceeds a flow rate threshold THv while an internal pressure Pi of the purge lineis reduced from a first pressure value Pto a second pressure value P, for example. The blockage determination portiondetermines that a blockage has occurred in the purge line, if the flow rate V of the inner fluid Fi falls below the flow rate threshold THv after the internal pressure Pi is reduced from the first pressure value Pto the second pressure value P

Blockage detection system and blockage detection method

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Wako, Japan

Masahiro Fujii