FAILURE DIAGNOSIS DEVICE FOR CYLINDER INTERNAL PRESSURE SENSOR

• Main Authors: OKUMURA TAKUJIN, NAKAGAWA SHIGERU, MAIKUMA TAIKI, HASHIMOTO HIDETOSHI, TORII KAZU, FUJIWARA RYOJI, KINOSHITA MASAYUKI, TSUMURA YUICHIRO, TANAKA DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 12.03.2020
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

To enhance accuracy in failure diagnosis of a cylinder internal pressure sensor.SOLUTION: A failure diagnosis device 100 for a cylinder internal pressure sensor includes a cylinder internal pressure sensor SW6, and a diagnosis section 111 for diagnosing the failure of the cylinder internal pressure sensor. The diagnosis section includes a reading section 1111 for reading a signal of the cylinder internal pressure sensor within a specified crank angle region, a reference phase determination section 1116 for determining a reference phase which is the phase of the pressure change accompanied by the volume change of a combustion chamber 17, and a failure determination section 1112 for determining the failure of the cylinder internal pressure sensor when the phase of the signal of the cylinder internal pressure sensor read by the reading section is delayed beyond a predetermined threshold with respect to the reference phase determined by the reference phase determination section.SELECTED DRAWING: Figure 9 【課題】筒内圧センサの故障診断の正確性を高める。【解決手段】筒内圧センサの故障診断装置１００は、筒内圧センサＳＷ６と、筒内圧センサの故障を診断する診断部１１１と、を備える。診断部は、特定のクランク角範囲における筒内圧センサの信号を読み込む読込部１１１１と、燃焼室１７の容積変化に伴う圧力変化の位相である基準位相を判定する基準位相判定部１１１６と、読込部が読み込んだ筒内圧センサの信号の位相が、基準位相判定部が判定した基準位相に対して、予め定めたしきい値を超えて遅れているときに、筒内圧センサが故障であると判定する故障判定部１１１２と、を有している。【選択図】図９