PISTON TEMPERATURE ESTIMATION DEVICE AND PISTON TEMPERATURE ESTIMATION METHOD

• Main Authors: ADACHI TOSHIAKI, MITA TAKURO, HANAMURA YOSHIFUMI, TSUBOTA YORIMASA, AOKI NOBUO
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2018
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; 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

To accurately estimate the temperature of a piston.SOLUTION: A piston temperature estimation device 1 includes an estimation part 52 for estimating a piston temperature showing the temperature of the piston of an engine E and also estimating hydraulic pressure of oil to be injected to the piston, an acquisition part 51 for acquiring hydraulic pressure information showing the hydraulic pressure, a correction value calculation part 53 for detecting whether the oil is injected or not to the piston, and a correction part 59 for correcting the piston temperature on the basis of a difference between the estimated hydraulic pressure and the hydraulic pressure shown by the hydraulic pressure information and whether the oil is injected or not detected by the correction value calculation part 53.SELECTED DRAWING: Figure 4 【課題】ピストンの温度を精度良く推定する。【解決手段】ピストン温度推定装置１は、エンジンＥが備えるピストンの温度を示すピストン温度を推定するとともに、ピストンに噴射するオイルの油圧を推定する推定部５２と、油圧を示す油圧情報を取得する取得部５１と、ピストンへのオイルの噴射の有無を検出する補正値算出部５３と、推定された油圧と油圧情報が示す油圧との差分と、補正値算出部５３において検出されたオイルの噴射の有無とに基づいて、ピストン温度を補正する補正部５９と、を備える。【選択図】図４