OIL TEMPERATURE ESTIMATION DEVICE AND OIL TEMPERATURE ESTIMATION METHOD

• Main Authors: KOBAYASHI HIROSHI, HARADA JUNJI, WADA TATSUO
• Format: Patent
• Language: English; Japanese
• Published: 13.12.2023
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

To provide an oil temperature estimation device capable of estimating an oil temperature of a driving system without using (including) an oil temperature sensor for detecting the oil temperature.SOLUTION: An ECU 80 constituting an oil temperature estimation device 1 includes a saturation oil temperature acquiring unit 81 for calculating a saturation oil temperature Tfin on the basis of an outside air temperature (engine intake air temperature) Ta and vehicle speed Vcar, an oil temperature deviation acquiring unit 82 for calculating an oil temperature deviation Tdif between the saturation oil temperature Tfin and a previous value Te (n-1) of an estimated oil temperature, an oil temperature feedback value acquiring unit 83 for calculating an oil temperature feedback value Tfb on the basis of the oil temperature deviation Tdif and the vehicle speed Vcar, and an estimated oil temperature acquiring unit 84 for calculating a current value Te (n) of the estimated oil temperature on the basis of the previous value Te (n-1) of the estimated oil temperature and the oil temperature feedback value Tfb.SELECTED DRAWING: Figure 1 【課題】油温を検出する油温センサを用いることなく（備えることなく）、駆動系の油温を推定することが可能な油温推定装置を提供する。【解決手段】油温推定装置１を構成するＥＣＵ８０は、外気温（エンジン吸気温）Ｔａおよび車速Ｖｃａｒに基づいてサチュレート油温Ｔｆｉｎを求めるサチュレート油温取得部８１と、サチュレート油温Ｔｆｉｎと推定油温の前回値Ｔｅ（ｎ－１）との油温偏差Ｔｄｉｆを求める油温偏差取得部８２と、油温偏差Ｔｄｉｆおよび車速Ｖｃａｒに基づいて油温フィードバック値Ｔｆｂを求める油温フィードバック値取得部８３と、推定油温の前回値Ｔｅ（ｎ－１）と油温フィードバック値Ｔｆｂとに基づいて推定油温の今回値Ｔｅ（ｎ）を求める推定油温取得部８４とを備える。【選択図】 図１