Temperature warning device and temperature warning method of friction element

• US 9,897,202 B2
• Filed: 02/12/2014
• Issued: 02/20/2018
• Est. Priority Date: 04/10/2013
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Ooshima, Kenichi, Yamamoto, Takeshi, Tsukidate, Hidetoshi
• Primary Examiner(s): Pang, Roger L
• Application Number:
  US14/783,445
• Publication Number:
  US 20160076644A1
• Time in Patent Office: 1,469 Days
• Field of Search: 701 65, 701 62
• CPC Class Codes: F16D 2500/30404 Clutch temperature
• CPC Class Codes: F16D 2500/3166 Detection of an elapsed period of time
• CPC Class Codes: F16D 2500/5106 Overheat protection
• CPC Class Codes: F16D 2500/7101 Driver alarm
• CPC Class Codes: F16D 2500/7103 Acoustic alarms
• CPC Class Codes: F16D 48/06 Control by electric or electronic means, e.g. of fluid pressure
• CPC Class Codes: F16H 2059/725 Sensing or calculating temperature of friction devices, e.g. clutches to prevent overheating of friction linings
• CPC Class Codes: F16H 2061/1216 Display or indication of detected failures
• CPC Class Codes: F16H 2061/1276 the failing part is a friction device, e.g. clutches or brakes
• CPC Class Codes: F16H 59/72 dependent on oil characteristics, e.g. temperature, viscosity
• CPC Class Codes: F16H 61/12 Detecting malfunction or potential malfunction, e.g. fail safe in control of hydrostatic gearing F16H61/4192; Circumventing or fixing failures

Abstract

A temperature warning method of a friction element for issuing a warning depending on temperature of the friction element arranged between a power source and a driving wheel, includes issuing the warning when the temperature of the friction element exceeds an upper limit temperature, and making a period of time, from when the temperature of the friction element exceeds the upper limit temperature until when the warning is issued, longer when the temperature of the friction element exceeds the upper limit temperature for a first time than when the temperature of the friction element exceeds the upper limit temperature for a second or subsequent time.

Claims

1. A temperature warning device of a friction element for issuing a warning depending on temperature of the friction element arranged between a power source and a driving wheel, comprising:

a warning issuing unit that issues the warning when the temperature of the friction element exceeds an upper limit temperature and a state in which the temperature of the friction element exceeds the upper limit temperature continues; and

a warning issuing timing adjusting unit that makes a period of time, from when the temperature of the friction element exceeds the upper limit temperature until when the warning issuing unit issues the warning, longer when the temperature of the friction element exceeds the upper limit temperature for a first time and the state in which the temperature of the friction element exceeds the upper limit temperature continues, than when the temperature of the friction element exceeds the upper limit temperature for a second or subsequent time and the state in which the temperature of the friction element exceeds the upper limit temperature continues.

2. The temperature warning device of the friction element according to claim 1, further comprising:

a friction element temperature calculating and outputting unit that calculates the temperature of the friction element on the basis of an operation state of the friction element, and outputs a calculation value of the temperature of the friction element to the warning issuing unit,

wherein the warning issuing timing adjusting unit is formed by the friction element temperature calculating and outputting unit outputting, for a predetermined period of time, a value lower than the upper limit temperature, instead of the calculation value of the temperature of the friction element, to the warning issuing unit, when the calculation value of the temperature of the friction element exceeds the upper limit temperature for a first time.

3. A temperature warning method of a friction element for issuing a warning depending on temperature of the friction element arranged between a power source and a driving wheel, comprising:

issuing the warning when the temperature of the friction element exceeds an upper limit temperature and a state in which the temperature of the friction element exceeds the upper limit temperature continues; and

making a period of time, from when the temperature of the friction element exceeds the upper limit temperature until when the warning is issued, longer when the temperature of the friction element exceeds the upper limit temperature for a first time and the state in which the temperature of the friction element exceeds the upper limit temperature continues, than when the temperature of the friction element exceeds the upper limit temperature for a second or subsequent time and the state in which the temperature of the friction element exceeds the upper limit temperature continues.

4. A temperature warning device of a friction element for issuing a warning depending on temperature of the friction element arranged between a power source and a driving wheel, comprising:

warning issuing means for issuing the warning when the temperature of the friction element exceeds an upper limit temperature and a state in which the temperature of the friction element exceeds the upper limit temperature continues; and

warning issuing timing adjusting means for making a period of time, from when the temperature of the friction element exceeds the upper limit temperature until when the warning issuing means issues the warning, longer when the temperature of the friction element exceeds the upper limit temperature for a first time and the state in which the temperature of the friction element exceeds the upper limit temperature continues, than when the temperature of the friction element exceeds the upper limit temperature for a second or subsequent time and the state in which the temperature of the friction element exceeds the upper limit temperature continues.