FAILURE DETERMINATION DEVICE OF OIL COOLING SYSTEM

• Main Authors: MUTO AKIO, SAITO YOSHIHARU
• Format: Patent
• Language: English; Japanese
• Published: 11.07.2016
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To identify a factor of failure of an oil cooling system in a transmission.SOLUTION: Failure of pipes P1, P2 is determined when a hydraulic pressure P is more than a second hydraulic pressure threshold value PS2, and an oil temperature T is higher than an oil temperature threshold value TS; failure of a hydraulic circuit of a transmission M is determined when the hydraulic pressure P is more than the second hydraulic pressure threshold value PS2, and the oil temperature T is the oil temperature threshold value TS or lower; failure of an oil cooler OC is determined when the hydraulic pressure P is a first hydraulic pressure threshold value PS1 or more, and is the second hydraulic pressure threshold value PS2 or less, and the oil temperature T is higher than the oil temperature threshold value TS; failure of the hydraulic circuit of the transmission M is determined, when the hydraulic pressure P is less than the first hydraulic pressure threshold value PS1, and the oil temperature T is higher than the oil temperature threshold value TS; and impossibility of failure determination of the oil cooling system is determined when the hydraulic pressure P is less than the first hydraulic pressure threshold value PS1 and the oil temperature T is the oil temperature threshold value TS or less. Thus, the factor of the failure of the oil cooling system can be determined while finely classifying the factors.SELECTED DRAWING: Figure 3 【課題】 トランスミッションのオイル冷却系の故障の原因を特定する。【解決手段】 油圧Ｐが第２油圧閾値ＰＳ２よりも大きく、かつ油温Ｔが油温閾値ＴＳよりも大きい場合に、配管Ｐ１，Ｐ２に故障があると判定し、油圧Ｐが第２油圧閾値ＰＳ２よりも大きく、かつ油温Ｔが油温閾値ＴＳ以下の場合に、トランスミッションＭの油圧回路に故障があると判定し、油圧Ｐが第１油圧閾値ＰＳ１以上であって第２油圧閾値ＰＳ２以下であり、かつ油温Ｔが油温閾値ＴＳよりも大きい場合に、オイルクーラＯＣに故障があると判定し、油圧Ｐが第１油圧閾値ＰＳ１よりも小さく、かつ油温Ｔが油温閾値ＴＳよりも大きい場合に、トランスミッションＭの油圧回路に故障があると判定し、油圧Ｐが第１油圧閾値ＰＳ１よりも小さく、かつ油温Ｔが油温閾値ＴＳ以下である場合に、オイル冷却系の故障判定が不能であると判定するので、オイル冷却系の故障の原因を細かく場合分けして判定することが可能となる。【選択図】 図３