CN110139993B - Estimation device and estimation method - Google Patents
Estimation device and estimation method Download PDFInfo
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- CN110139993B CN110139993B CN201780080697.XA CN201780080697A CN110139993B CN 110139993 B CN110139993 B CN 110139993B CN 201780080697 A CN201780080697 A CN 201780080697A CN 110139993 B CN110139993 B CN 110139993B
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- clutch
- temperature
- amount
- vehicle
- wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/12—Details not specific to one of the before-mentioned types
Abstract
An estimation device and an estimation method for clutch wear amount, comprising: sensors (50, 51) for acquiring a clutch slip amount; an acceleration sensor (54) that acquires the acceleration of the vehicle (1); a vehicle weight sensor (55) that acquires the vehicle weight of the vehicle (1); a temperature acquisition unit (57, 120) that acquires a clutch temperature; an absorbed energy calculation unit (110) that calculates the absorbed energy of the clutch on the basis of the amount of clutch slip, acceleration, and vehicle weight at the time of vehicle start; an accumulated damage degree calculation unit (130) that calculates an accumulated damage degree by accumulating the damage degree obtained by multiplying the absorbed energy by the clutch temperature; and a wear amount estimation unit (140) that estimates the amount of clutch wear based on the cumulative damage degree.
Description
Technical Field
The present disclosure relates to an estimation device and an estimation method, and more particularly to estimation of an amount of wear of a clutch that can disconnect/connect power transmitted from a drive source mounted on a vehicle to a transmission.
Background
As such a device, for example, patent document 1 discloses a technique of preventing a clutch from being burned or burned by estimating a heat generation amount of the clutch based on a slip amount, torque, or the like of the clutch and giving a warning to a driver when the heat generation amount reaches a predetermined high temperature threshold value.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2008-57670
Disclosure of Invention
Problems to be solved by the invention
However, in the above-described conventional technology, the amount of heat generation of the clutch is estimated based only on the amount of slip, torque, and the like of the clutch, and the amount of wear of the clutch is not predicted. Therefore, even if a warning is given because the heat generation amount reaches the high temperature threshold, there is a case where the clutch has come close to being completely worn, and there is a possibility that: the vehicle falls into a state where it cannot travel on the road until it travels to a maintenance factory or the like.
An object of the technology of the present disclosure is to effectively estimate an amount of wear of a clutch.
Means for solving the problems
The technology of the present disclosure is an estimation device of an amount of wear of a clutch that can disconnect/connect power transmitted from a drive source mounted on a vehicle to a transmission; it is characterized by comprising: a slip amount acquiring unit that acquires a slip amount of the clutch; acceleration acquisition means for acquiring an acceleration of the vehicle; a vehicle weight acquiring unit that acquires a vehicle weight of the vehicle; a temperature acquisition unit that acquires a temperature of the clutch; an absorbed energy calculation unit that calculates an absorbed energy of the clutch based on at least the slip amount, the acceleration, and the vehicle weight at the time of starting the vehicle; accumulated damage degree calculation means for calculating an accumulated damage degree of the clutch by accumulating a damage degree obtained by multiplying the absorbed energy by the temperature; and a wear amount estimating means for estimating a wear amount of the clutch based on the cumulative damage degree.
The wear amount estimating means may estimate the wear amount of the clutch based on a relationship between the cumulative damage degree and the wear amount of the clutch, the relationship being defined in advance.
The transmission may further include an oil temperature sensor that detects a temperature of the lubricant oil of the transmission, and the temperature acquisition means may estimate the temperature of the clutch based on a relationship between the temperature of the lubricant oil and the temperature of the clutch, the relationship being predetermined.
Further, the clutch control device may further include an input rotation speed sensor that detects an input rotation speed of the clutch, and an output rotation speed sensor that detects an output rotation speed of the clutch, and the slip amount obtaining means may obtain the slip amount of the clutch by subtracting the output rotation speed from the input rotation speed.
Further, the vehicle may further include a warning means for notifying the driver of the wear amount when the wear amount reaches a predetermined threshold value.
Further, the technology of the present disclosure is a method of estimating an amount of wear of a clutch that can disconnect/connect power transmitted from a drive source mounted on a vehicle to a transmission; the estimation method performs the following processing:
a slip amount acquisition process of acquiring a slip amount of the clutch; an acceleration acquisition process of acquiring an acceleration of the vehicle; a vehicle weight acquisition process of acquiring a vehicle weight of the vehicle; a temperature acquisition process of acquiring a temperature of the clutch; an absorbed energy calculation process of calculating an absorbed energy of the clutch based on at least the slip amount, the acceleration, and the vehicle weight at the time of starting the vehicle; a cumulative damage degree calculation process of calculating a cumulative damage degree of the clutch by integrating a damage degree obtained by multiplying the absorption energy by the temperature; and a wear amount estimation process of estimating a wear amount of the clutch based on the accumulated damage degree.
Effects of the invention
According to the technique of the present disclosure, the amount of wear of the clutch can be effectively estimated.
Brief description of the drawings
Fig. 1 is a schematic overall configuration diagram showing a part of a vehicle on which an estimation device according to an embodiment of the present disclosure is mounted.
Fig. 2 is a schematic functional block diagram showing an estimation device according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram showing an example of a temperature estimation table according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram showing an example of a wear amount estimation table according to an embodiment of the present disclosure.
Fig. 5 is a flowchart illustrating a clutch wear amount estimation process according to an embodiment of the present disclosure.
Detailed Description
An estimation device according to an embodiment of the present disclosure will be described below with reference to the drawings. The same components are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
Fig. 1 is a schematic overall configuration diagram showing a part of a vehicle 1 on which an estimation device according to the present embodiment is mounted. An input shaft 42 of the transmission 40 is connected to the crankshaft 11 of the engine 10 so as to be disconnectable and connectable via the clutch device 20. An input shaft 42, an output shaft 43, a counter shaft 44, a plurality of transmission gear trains 45 provided on these shafts 42 to 44, a synchronization mechanism not shown, and the like are disposed in a transmission case 41 of the transmission 40. Left and right drive wheels are connected to an output shaft 43 of the transmission 40 via a propeller shaft 47, a differential device, left and right drive shafts, and the like, which are not shown.
Further, the vehicle 1 is provided with various sensors including: an engine rotational speed sensor 50 that detects the rotational speed of the crankshaft 11; a transmission input rotation speed sensor 51 that detects the rotation speed of the input shaft 42; a vehicle speed sensor 52 that detects the speed of the vehicle 1; an accelerator opening sensor 53 that detects the depression amount of an accelerator pedal 71; an acceleration sensor 54 that detects an acceleration of the vehicle 1; a vehicle weight sensor 55 that detects the weight of the vehicle 1; a shift position sensor 56 that detects a shift position of the shift operating device 72; an oil temperature sensor 57 that detects the temperature of the lubricating oil in the transmission case 41; and a stroke sensor 58. The sensor values of the various sensors 50 to 58 are input to an electrically connected electronic control unit (hereinafter referred to as ECU) 100.
The clutch device 20 is, for example, a dry-type or single-plate type clutch device, and a crankshaft 11 of the engine 10 and an input shaft 42 of the transmission 40 are disposed in the clutch housing 21.
At the input end of the input shaft 42, a clutch plate 22 is arranged so as to be movable in the axial direction. The clutch plate 22 includes a damper spring, not shown, and a clutch disk 23.
A flywheel 12 is fixed to an output end of the crankshaft 11, and a clutch cover 24 is provided on a rear side surface of the flywheel 12. Between the flywheel 12 and the clutch cover 24, a pressure plate 25 and a diaphragm spring 26 are disposed. Further, a release bearing 27 that abuts an inner peripheral end of the diaphragm spring 26 is provided on the output side of the input shaft 42 with respect to the diaphragm spring 26 so as to be movable in the axial direction.
The release fork 28 is provided swingably about the fulcrum 19, and has one end side accommodated in the clutch case 21 in contact with a non-rotating ring of the release bearing 27. The other end side of the release fork 28 is made to protrude outward of the clutch housing 21.
Outside the clutch housing 21, a release cylinder 30 is provided. The separation cylinder 30 includes: a piston 32 movably housed in the cylinder body 31 and defining a hydraulic chamber; a push rod 33 having a base end side fixed to the piston 32 and a tip end side abutting against the release fork 28; and a spring 34 that is provided inside the cylinder body 31 and holds the push rod 33 between the piston 32 and the release fork 28. The separation cylinder 30 is connected to the master cylinder 60 via a pipe 35.
The master cylinder 60 includes: a storage tank 61 that stores working oil; a piston 63 movably housed in the cylinder body 62 and defining a hydraulic chamber; a rod 64 whose base end side is fixed to the piston 63 and whose tip end side is coupled to the clutch pedal 70; and a return spring 65 that is provided in the hydraulic chamber and biases the piston 63. Further, a stroke sensor 58 that detects the stroke amount of the rod 64 is provided to the master cylinder 60.
The clutch device 20 is switched from "connected" to "disconnected" by: when the driver steps on the clutch pedal 70, the piston 32 strokes together with the push rod 33 by the hydraulic pressure supplied from the master cylinder 60 to the release cylinder 30, and the release fork 28 rotates counterclockwise in the drawing to press the release bearing 27.
The ECU100 performs various controls of the engine 10, the clutch device 20, the transmission 40, and the like, and is configured to include a known CPU, a ROM, a RAM, an input port, an output port, and the like. Since these various controls are performed, the sensor values of the various sensors 50 to 58 are input to the ECU 100.
As shown in fig. 2, the ECU100 includes functional elements that are part of an absorbed energy calculation unit 110, a clutch temperature estimation unit 120, a cumulative damage degree calculation unit 130, a wear amount estimation unit 140, and a warning processing unit 150. Although each of these functional elements is described as being included in the ECU100 as an integrated hardware, any part of them may be provided in a separate hardware.
The absorbed energy calculation unit 110 is an example of the absorbed energy calculation means of the present disclosure, and calculates the absorbed energy Q of the clutch disk 23 based on the clutch slip amount Δ Nc, the vehicle acceleration G, and the vehicle weight W at the time of starting the vehicle. In the present embodiment, the clutch slip amount Δ Nc at the time of starting the vehicle is determined by the clutch input rotation speed Nc detected from the engine rotation speed sensor 50＿The clutch output rotation speed Nc detected by the transmission input rotation speed sensor 51 is subtracted from in＿outTo calculate (Δ Nc ═ Nc)＿in－Nc＿out). The acceleration G of the vehicle when the vehicle starts is acquired by the acceleration sensor 54. The vehicle weight W is acquired by the vehicle weight sensor 55. The absorption energy Q may be calculated based on a model equation, a map, or the like that includes these clutch slip amount Δ Nc, vehicle acceleration G, and vehicle weight W as input values.
The clutch temperature estimating unit 120 is an example of the temperature acquiring means of the present disclosure, and estimates the temperature of the clutch disk 23 (hereinafter, referred to as clutch temperature Tc). More specifically, a temperature estimation table (see fig. 3) that is prepared in advance through experiments or the like and that defines a correlation between the lubrication oil temperature To and the clutch temperature Tc of the transmission 40 is stored in the memory of the ECU 100. The clutch temperature estimating unit 120 estimates the clutch temperature Tc by referring To the temperature estimation table based on the lubrication oil temperature To input from the oil temperature sensor 57.
The cumulative damage degree calculation unit 130 is an example of the cumulative damage degree calculation means of the present disclosure, and calculates the cumulative damage degree Σ D (∑ (Q × Tc)) of the clutch friction plate 23 by multiplying the absorbed energy Q calculated by the absorbed energy calculation unit 110 at the time of starting the vehicle by the clutch temperature Tc estimated by the clutch temperature estimation unit 120 to calculate the damage degree D and integrating the damage degree D.
The wear amount estimating unit 140 is an example of the wear amount estimating means of the present disclosure, and estimates the wear amount of the clutch disk 23 (hereinafter, referred to as a clutch wear amount Wc). More specifically, a wear amount estimation table (see fig. 4) that defines a correlation between the cumulative damage degree Σ D and the clutch wear amount Wc, which is previously created through experiments or the like, is stored in the memory of the ECU 100. The wear amount estimation unit 140 estimates the clutch wear amount Wc by referring to the wear amount estimation table based on the cumulative damage degree Σ D calculated by the cumulative damage degree calculation unit 130.
The warning processing unit 150 is an example of the warning member of the present disclosure, and outputs an instruction signal to indicate that the clutch disk 23 needs to be replaced on the display 80 in the cab when the clutch wear amount Wc estimated by the wear amount estimation unit 140 reaches a predetermined upper threshold value (for example, a wear amount of 90 to 95% with respect to a new product) close to complete wear. The method of warning is not limited to display on the display 80, and may be performed by a sound emitted from a speaker or the like, not shown.
Next, the process of estimating the clutch wear amount according to the present embodiment will be described based on the flowchart of fig. 5. This control is started simultaneously with the ignition key on operation of the engine 10.
In step S100, it is determined whether the vehicle 1 is to be started. Whether the vehicle 1 is to start or not may be determined based on the sensor values of the vehicle speed sensor 52 and the like. If the vehicle 1 has started (affirmative), the control proceeds to step S110.
In step S110, the absorption energy Q of the clutch friction plate 23 is calculated based on the clutch slip amount Δ Nc, the vehicle acceleration G, and the vehicle weight W, then in step S120, the clutch temperature Tc is estimated based on the temperature estimation table (see fig. 3), and then in step S130, the degree of damage D is calculated by multiplying the absorption energy Q by the clutch temperature Tcn. Further, in step S140, the accumulated damage degree Σ D calculated in the previous time is calculated as neededn－1Adding the damage degree D calculated in step S130nThereby to real-time cumulative damage ∑ DnAnd (6) performing operation.
In step S150, the accumulated damage degree sigma D calculated in step S140 is usednThe clutch wear amount Wc is estimated by referring to the wear amount estimation table (see fig. 4).
In step S160, it is determined whether the clutch wear amount Wc has reached the upper threshold. If the clutch wear amount Wc has reached the upper threshold value (yes), the control proceeds to step S180, where a warning is given to the display 80 that the clutch disk 23 needs to be replaced.
On the other hand, if the clutch wear amount Wc has not reached the upper threshold value (no), the control proceeds to step S170 to determine whether the clutch slip amount Δ Nc is 0 (zero). If the clutch slip amount Δ Nc is not 0 (no), the control returns to step S110, and the above-described processes of steps S110 to S160 are repeatedly executed until the clutch slip amount Δ Nc becomes 0. On the other hand, if the clutch slip amount Δ Nc is 0 (affirmative), the control is returned and retained until the next vehicle start.
As described above in detail, according to the estimation device of the present embodiment, the clutch wear amount Wc is estimated based on the absorption energy Q of the clutch disk 23 at the time of starting the vehicle and the accumulated damage degree D calculated from the clutch temperature Tc, and when the clutch wear amount Wc reaches a predetermined upper limit threshold value close to the complete wear (for example, a wear amount of 90 to 95% with respect to a new product), a warning is given to the driver that the clutch disk 23 needs to be replaced. This makes it possible to appropriately grasp the appropriate timing for replacing the components while effectively estimating the clutch wear amount Wc, and thus to prevent an on-road failure due to complete wear of the clutch disk 23 from occurring.
The present disclosure is not limited to the above-described embodiments, and can be implemented by being appropriately modified within a scope not departing from the gist of the present invention.
For example, although the clutch temperature Tc is estimated based on the lubricating oil temperature To of the transmission 40, it may be estimated based on a sensor value of a temperature sensor, not shown, which detects the temperature of the clutch case 21.
The vehicle 1 is not limited to a vehicle including the engine 10 as a drive source, and may be a hybrid vehicle including a traveling electric motor, or the like.
The present application is based on Japanese patent application No. 2016 (252379) filed on 27/12/2016, the contents of which are hereby incorporated by reference.
Industrial applicability
The present invention has an effect of effectively estimating the amount of wear of the clutch, and is useful for an estimation device, an estimation method, and the like.
Description of the reference numerals
10 Engine
11 crankshaft
20 Clutch device
21 clutch housing
22 clutch plate
23 Clutch friction plate
24 Clutch cover
25 pressure plate
26 diaphragm spring
27 throw-out bearing
28 Release fork
40 speed variator
42 input shaft
50 Engine speed sensor (slippage acquisition component)
51 Transmission input speed sensor (slip amount obtaining part)
54 acceleration sensor (acceleration acquisition component)
55 vehicle weight sensor (vehicle weight obtaining part)
57 oil temperature sensor (temperature acquisition component)
80 display (Warning component)
100 ECU
110 absorbed energy calculation part (absorbed energy calculation part)
120 clutch temperature estimating part (temperature obtaining part)
130 cumulative damage degree calculation part (cumulative damage degree calculation means)
140 wear amount estimating part (wear amount estimating member)
150 Warning processing part (warning device)
Claims (9)
1. An estimation device that estimates an amount of wear of a clutch that can disconnect/connect power transmitted from a drive source mounted on a vehicle to a transmission, the estimation device comprising:
a slip amount acquiring means for acquiring a slip amount of the clutch,
acceleration acquisition means for acquiring acceleration of the vehicle,
a vehicle weight acquiring means for acquiring a vehicle weight of the vehicle,
a temperature acquisition means for acquiring a temperature of the clutch,
an absorbed energy calculation means for calculating the absorbed energy of the clutch based on at least the slip amount, the acceleration, and the vehicle weight at the time of starting the vehicle,
cumulative damage degree calculation means for calculating a cumulative damage degree of the clutch by integrating a damage degree obtained by multiplying the absorption energy by the temperature, and
and a wear amount estimating means for estimating a wear amount of the clutch based on the cumulative damage degree.
2. The estimation device according to claim 1, wherein,
the wear amount estimating means estimates the wear amount of the clutch based on a relationship between the cumulative damage degree and the wear amount of the clutch, which is predetermined in advance.
3. The estimation device according to claim 1, wherein,
further comprising:
an oil temperature sensor that detects a temperature of the lubricating oil of the transmission;
the temperature acquisition means estimates the temperature of the clutch based on a relationship between the temperature of the lubricating oil and the temperature of the clutch, which is predetermined.
4. The estimation device according to claim 1, wherein,
further comprising:
an input rotation speed sensor that detects an input rotation speed of the clutch, an
An output rotation speed sensor that detects an output rotation speed of the clutch;
the slip amount obtaining means obtains the slip amount of the clutch by subtracting the output rotation speed from the input rotation speed.
5. The estimation device according to any one of claims 1 to 4, wherein,
further comprising a warning means for notifying a driver of information that the amount of wear has reached a predetermined threshold value when the amount of wear has reached the predetermined threshold value.
6. An estimation method that estimates an amount of wear of a clutch that can disconnect/connect power transmitted from a drive source mounted on a vehicle to a transmission, characterized by executing:
a slip amount acquisition process for acquiring the slip amount of the clutch,
an acceleration acquisition process of acquiring an acceleration of the vehicle,
a vehicle weight acquisition process for acquiring the vehicle weight of the vehicle,
a temperature acquisition process for acquiring the temperature of the clutch,
an absorbed energy calculation process of calculating the absorbed energy of the clutch based on at least the slip amount, the acceleration, and the vehicle weight at the time of starting the vehicle,
cumulative damage degree calculation processing of calculating a cumulative damage degree of the clutch by integrating a damage degree obtained by multiplying the absorption energy by the temperature, and
and a wear amount estimation process of estimating a wear amount of the clutch based on the cumulative damage degree.
7. The estimation method according to claim 6, wherein,
the wear amount estimation process estimates the wear amount of the clutch based on a relationship between the cumulative damage degree and the wear amount of the clutch, which is predetermined in advance.
8. The estimation method according to claim 6, wherein,
the temperature acquisition process estimates the temperature of the clutch based on a predetermined relationship between the temperature of the transmission lubricant and the temperature of the clutch.
9. The estimation method according to any one of claims 6 to 8, wherein,
further performing:
an input rotation speed detection process of detecting an input rotation speed of the clutch, an
An output rotation speed detection process of detecting an output rotation speed of the clutch;
the slip amount obtaining process obtains the slip amount of the clutch by subtracting the output rotation speed from the input rotation speed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-252379 | 2016-12-27 | ||
| JP2016252379A JP6720855B2 (en) | 2016-12-27 | 2016-12-27 | Estimator |
| PCT/JP2017/045234 WO2018123670A1 (en) | 2016-12-27 | 2017-12-18 | Estimation apparatus and estimation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110139993A CN110139993A (en) | 2019-08-16 |
| CN110139993B true CN110139993B (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780080697.XA Active CN110139993B (en) | 2016-12-27 | 2017-12-18 | Estimation device and estimation method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6720855B2 (en) |
| CN (1) | CN110139993B (en) |
| WO (1) | WO2018123670A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022030163A (en) * | 2020-08-06 | 2022-02-18 | トヨタ自動車株式会社 | Temperature estimation device for friction engagement element |
| CN115217874B (en) * | 2022-07-14 | 2023-06-20 | 东风商用车有限公司 | Clutch wear life prediction system and method |
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| US4756397A (en) * | 1985-02-20 | 1988-07-12 | Societe Des Cables Du Mans | Mechanical cable control with an automatic adjustment device and an electrical detector of operation |
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| JP2006017306A (en) * | 2004-06-30 | 2006-01-19 | Luk Lamellen & Kupplungsbau Beteiligungs Kg | Method of protecting automatic operation vehicle clutch against overload |
| CN102338171A (en) * | 2011-06-21 | 2012-02-01 | 三一重工股份有限公司 | Clutch abrasion detection system and automobile |
| CN104214243A (en) * | 2013-06-04 | 2014-12-17 | 罗伯特·博世有限公司 | Method for determining clutch wear |
| CN204788947U (en) * | 2015-07-14 | 2015-11-18 | 北京信息科技大学 | Test test bench of wet clutch friction disc wearing and tearing volume |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5232441B2 (en) * | 2007-10-30 | 2013-07-10 | 三菱重工業株式会社 | Clutch device alarm device |
| JP5918946B2 (en) * | 2011-08-29 | 2016-05-18 | アイシン・エーアイ株式会社 | Vehicle power transmission control device |
| JP6172907B2 (en) * | 2012-10-01 | 2017-08-02 | ダイムラー・アクチェンゲゼルシャフトＤａｉｍｌｅｒ ＡＧ | Overload history storage device for friction clutch for vehicle |
| JP6065812B2 (en) * | 2012-11-01 | 2017-01-25 | トヨタ自動車株式会社 | Control device for hybrid vehicle |
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2016
- 2016-12-27 JP JP2016252379A patent/JP6720855B2/en active Active
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2017
- 2017-12-18 WO PCT/JP2017/045234 patent/WO2018123670A1/en active Application Filing
- 2017-12-18 CN CN201780080697.XA patent/CN110139993B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4756397A (en) * | 1985-02-20 | 1988-07-12 | Societe Des Cables Du Mans | Mechanical cable control with an automatic adjustment device and an electrical detector of operation |
| CN1469055A (en) * | 2002-06-14 | 2004-01-21 | 三菱扶桑卡客车公司 | Clutch cushion wear detecting equipment |
| JP2006017306A (en) * | 2004-06-30 | 2006-01-19 | Luk Lamellen & Kupplungsbau Beteiligungs Kg | Method of protecting automatic operation vehicle clutch against overload |
| CN102338171A (en) * | 2011-06-21 | 2012-02-01 | 三一重工股份有限公司 | Clutch abrasion detection system and automobile |
| CN104214243A (en) * | 2013-06-04 | 2014-12-17 | 罗伯特·博世有限公司 | Method for determining clutch wear |
| CN204788947U (en) * | 2015-07-14 | 2015-11-18 | 北京信息科技大学 | Test test bench of wet clutch friction disc wearing and tearing volume |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110139993A (en) | 2019-08-16 |
| WO2018123670A1 (en) | 2018-07-05 |
| JP6720855B2 (en) | 2020-07-08 |
| JP2018105414A (en) | 2018-07-05 |
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