ENGINE OIL DETERIORATION DETERMINATION METHOD

• Main Author: KISHIMOTO YOSHIHISA
• Format: Patent
• Language: English; Japanese
• Published: 30.05.2016
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; CRANKCASE VENTILATING; ENGINE PLANTS IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; LUBRICATING INTERNAL COMBUSTION ENGINES; LUBRICATING OF MACHINES OR ENGINES IN GENERAL; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

PROBLEM TO BE SOLVED: To provide an engine oil deterioration determination method with higher determination accuracy than ever before.SOLUTION: An engine oil deterioration determination method determines deterioration of engine oil through the steps to: acquire a flow rate of air sent to a turbocharger 4 with a flow rate sensor 20 installed in an intake passage 2 of a diesel engine; calculate a suction pressure ratio of the turbocharger 4 with an intake pressure sensor 21 installed in the intake passage 2 and an exhaust pressure sensor 22 installed in an exhaust passage 13; obtain a rotation speed of a rotary shaft 14 with a rotation sensor 23 installed on the turbocharger 4; and determine whether or not engine oil 19 is deteriorated on the basis of a predetermined map data showing a relation of viscosity of the engine oil 19 with the flow rate of the air, the suction pressure ratio and the rotation speed.SELECTED DRAWING: Figure 1 【課題】従来よりも判定精度を向上したエンジンオイルの劣化判定方法を提供する。【解決手段】ディーゼルエンジンの吸気通路２に設置された流量センサ２０からターボチャージャー４への空気流量を求めるステップと、吸気通路２に設置された吸気圧力センサ２１及び排気通路１３に設置された排気圧力センサ２２からターボチャージャー４の吸入圧力比を求めるステップと、ターボチャージャー４に取り付けられた回転センサ２３から回転軸１４の回数数を求めるステップと、それらの空気流量、吸入圧力及び回転数とエンジンオイル１９の粘性との関係を示す予め設定されたマップデータに基づいてエンジンオイル１９の劣化の有無を判定するステップとからエンジンオイルの劣化を判定する。【選択図】図１