ABNORMALITY DETECTION DEVICE, AND METHOD FOR DETECTING ABNORMALITY IN POWER SUPPLY SYSTEM

• Main Authors: KUMAZAWA SHINJI, NAKANO HITOSHI, TODA SATOSHI
• Format: Patent
• Language: English; Japanese
• Published: 21.01.2016
• Subjects: BLASTING; COMBUSTION APPARATUS; COMBUSTION ENGINES; COMBUSTION PROCESSES; EXTINGUISHING-DEVICES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MECHANICAL ENGINEERING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

PROBLEM TO BE SOLVED: To suppress erroneous detection of an abnormality in a power supply system in which a capacitor is arranged in parallel with a semiconductor switching element, or in parallel with a glow plug.SOLUTION: An abnormality detection device is provided with: a measurement part which measures input part potential of a glow plug; and a detection part which detects an abnormality of a power supply system based on the input part potential, in which the detection part detects the abnormality of the power supply system based on a comparison result between the input part potential measured after elapse of standby time to be determined based on capacity of a capacitor and internal impedance of the power system after a semiconductor switching element shields supply of power and predetermined threshold potential. 【課題】半導体スイッチング素子と並列、またはグロープラグと並列にコンデンサが配置される電力供給システムにおいて、異常の誤検知を抑制する。【解決手段】異常検知装置は、グロープラグの入力部電位を測定する測定部と、入力部電位に基づき電力供給システムの異常を検知する検知部と、を備え、検知部は、半導体スイッチング素子が電力の供給を遮断してから、コンデンサの容量および電力供給システムの内部インピーダンスに基づき定められる待機時間を経過した以降に測定された入力部電位と予め定められた閾値電位との比較結果に基づき、電力供給システムの異常を検知する。【選択図】図１