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; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

To accurately estimate the temperature of a piston.SOLUTION: A piston temperature estimation device 1 includes a piston temperature estimation part 5 for estimating a piston temperature showing the temperature of the piston of an engine E, a selection part 62 for selecting a time constant showing the speed degree of a temperature change of the piston temperature on the basis of the change state of the piston temperature, and a correction part 63 for correcting the piston temperature on the basis of the time constant. The piston temperature estimation device 1 further includes an acquisition part 61 for acquiring state information showing the state of the engine E. The selection part 62 selects the time constant on the basis of the change state of the piston temperature and the state information.SELECTED DRAWING: Figure 10 【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ピストン温度推定部５と、ピストン温度の変化状況に基づいて、ピストン温度の温度変化の速さの度合いを示す時定数を選択する選択部６２と、時定数に基づいて、ピストン温度を補正する補正部６３と、を備える。ピストン温度推定装置１は、エンジンＥの状態を示す状態情報を取得する取得部６１をさらに備え、選択部６２は、ピストン温度の変化状況と状態情報とに基づいて、時定数を選択する。【選択図】図１０