JP2018115683A - Clutch facing temperature estimation method and clutch facing temperature estimation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch facing temperature estimation method for estimating a temperature change of a clutch facing in a state that an ignition key is turned off, and a clutch facing temperature estimation device.SOLUTION: A temperature change of a clutch facing in a current cycle (rising temperature component T, and lowering temperature components Tand T) based on a difference between input energy to a clutch 13 in the current cycle and output energy from the clutch 13 is estimated, and when the current cycle is a cycle immediately after the ignition key 29 is transited from an off-state to a state other than the off-state (on-state or a state that only an electric component can be used), the temperature change (lowering temperature component T) of the clutch facing during the off-state of the ignition key 29 is estimated, and a clutch facing temperature Tin the current cycle is calculated.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a clutch facing temperature estimation method and a clutch facing temperature estimation device.

  2. Description of the Related Art Conventionally, in a vehicle, an automatic transmission that performs a shift by switching a power transmission path constituted by a plurality of transmission gears using a clutch or the like is widely used. As a typical clutch device, there is a friction clutch device in which a friction material is pressed against a driving side plate and engaged by friction. Since the friction clutch device uses frictional force for torque transmission, the frequency of clutch engagement increases when frequent shifting operations are performed, and the temperature of the clutch friction surface (clutch facing) increases. If the clutch facing temperature rises excessively (above the specified temperature), the clutch facing may deteriorate due to burning or the like, and the clutch facing temperature is acquired and managed to protect the clutch facing. It has been broken.

  As a method for estimating the temperature of the clutch facing, for example, there is a technique disclosed in Patent Document 1. In Patent Document 1, the CPU obtains the relative rotational speed between the engine and the input of the transmission from the difference between the engine rotational speed and the transmission input shaft rotational speed, and converts the engine rotational speed by converting the unit based on the relative rotational speed. And calculating the temperature rise of the clutch per second based on the input energy of the clutch calculated by multiplying the relative angular velocity and the clutch torque by the relative angular velocity. ing.

JP 2004-060772 A

  In general, in a vehicle, power is not supplied to the CPU when the ignition key is off. For this reason, when the ignition key is off, the technique disclosed in Patent Document 1 cannot be used by the CPU to estimate the clutch facing temperature.

  In the method of estimating the temperature change of the clutch facing per time from the difference between the input energy and the output energy to the clutch as in the technique disclosed in Patent Document 1, in order to calculate the current temperature of the clutch facing, The initial temperature of the clutch facing at the start of estimation is required. However, in the technique disclosed in Patent Document 1, since the CPU cannot estimate the temperature change of the clutch facing while the ignition key is off, the clutch facing when the ignition key is turned on next time is not possible. Can not know the initial temperature.

  Under such circumstances, it is desired to estimate the temperature change of the clutch facing while the ignition key is off.

  An object of the present disclosure is to provide a clutch facing temperature estimation method and a clutch facing temperature estimation device for estimating a temperature change of a clutch facing during a state where an ignition key is off.

  A clutch facing temperature estimation method of the present disclosure is a clutch facing temperature estimation method for estimating a temperature of the clutch facing for each predetermined time period in a clutch that transmits power of a power source to a subsequent stage by friction of the clutch facing. A step of estimating a temperature change of the clutch facing in the current cycle based on a difference between input energy to the clutch and output energy from the clutch in the current cycle; When the cycle is immediately after the transition to the other state, the step of estimating the temperature change of the clutch facing while the start key is in the off state, and immediately before the start key transitions to the off state Clutch facing temperature in the cycle and the above in the current cycle And the temperature change of the latch facing, and the temperature change of the clutch facings between the starting key is off state, based on, and a step of calculating a clutch facing temperature in the current cycle.

  A clutch facing temperature estimating device of the present disclosure is a clutch facing temperature estimating device that estimates the temperature of the clutch facing for each predetermined time period in a clutch that transmits power of a power source to a subsequent stage by friction of the clutch facing. Based on the difference between the input energy to the clutch in the current cycle and the output energy from the clutch, the temperature change of the clutch facing in the current cycle is estimated, and the start key of the power source is changed from the OFF state to the current cycle. In the cycle immediately after the transition to a state other than the above, the temperature change of the clutch facing is estimated while the start key is in the OFF state, and the clutch facing in the cycle immediately before the start key transitions to the OFF state Temperature and the temperature of the clutch facing in the current cycle Change and the starting key and the temperature change of the clutch facings between was turned off, based on the calculated clutch facing temperature in the current cycle.

  According to the present disclosure, it is possible to estimate a temperature change of the clutch facing while the ignition key is off.

The figure which shows the structure of the vehicle in embodiment of this indication. The block diagram which showed the structure used in the clutch facing temperature estimation process by a control apparatus Flowchart for explaining an operation example of the control device in the clutch facing temperature estimation process

  Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings.

<Vehicle configuration>
FIG. 1 is a diagram illustrating a configuration of a vehicle 1 according to an embodiment of the present disclosure. As shown in FIG. 1, the vehicle 1 includes a control device 10, an engine 11, a fluid coupling 12, a clutch 13, a transmission 14, a hydraulic control circuit 15, a crankshaft 16, a propeller shaft 17, a differential gear 18, and drive wheels 19. .

  The control device 10 controls the operation of each component of the vehicle 1 such as the engine 11, the transmission 14, and the hydraulic control circuit 15. The engine 11, the transmission 14, and the hydraulic control circuit 15 are controlled by, for example, individually provided control units (ECU (Electric Control Unit), TCM (Transmission Control Module), etc.) each other. ) Control may be performed in cooperation with each other while performing communication, but in the present embodiment, an example in which the control apparatus 10 performs control collectively will be described. The control device 10 is an example of a clutch facing temperature estimation device of the present disclosure.

  The control device 10 includes a CPU (Central Processing Unit), a ROM (Read Only Memory) storing a control program, a working memory such as a RAM (Random Access Memory), and the like. The CPU reads out the control program from the ROM and develops it in the RAM, and performs centralized control of the operations of the engine 11, the transmission 14, the hydraulic control circuit 15 and the like in cooperation with the developed control program.

  The engine 11 is an internal combustion engine such as a diesel engine, for example, and rotates the crankshaft 16 by heat energy generated by combustion of fuel. The engine 11 is an example of a power source according to the present disclosure.

  The torque (engine torque) of the crankshaft 16 provided by the engine 11 is transmitted to the transmission 14 through the fluid coupling 12 and the clutch 13. The fluid coupling 12 is a kind of fluid conduction device. For example, two impellers are arranged opposite to each other in a casing filled with hydraulic oil. When the input-side impeller (pump impeller) rotates, the hydraulic oil flows, and the hydraulic oil rotates the output-side impeller (turbine impeller), so that fluid torque is transmitted to the output side. The fluid coupling 12 enables smooth start by sliding of the hydraulic oil, or absorbs torque fluctuation of the engine 11 to reduce vibration and noise. In addition, illustration is abbreviate | omitted about the above-mentioned casing and two impellers.

  The clutch 13 is a friction engagement element, specifically, for example, a wet multi-plate clutch. The clutch 13 has a structure in which, for example, a plurality of clutch plates meshed on the input side and the output side are alternately arranged in a casing filled with hydraulic oil. These clutch plates are biased by a spring in a direction in which they are not frictionally engaged, and the clutch 13 is disconnected in a state where hydraulic oil from the hydraulic control circuit 15 is not supplied. When hydraulic oil is supplied from the hydraulic control circuit 15, the clutch piston is pressed against the urging force of the clutch spring in a direction in which the clutch plates are frictionally engaged. When the plurality of clutch plates come into contact with each other and are frictionally engaged, the clutch 13 is in a connected state. A friction material is provided on the surface (clutch facing) where the clutch plates contact each other. In the clutch 13, the hydraulic oil plays both roles of cooling and lubricating the clutch plate. The clutch plate, spring, clutch piston, and clutch facing described above are not shown.

  In the connected state of the clutch 13, engine torque is transmitted to the transmission 14. In the present embodiment, the transmission 14 is, for example, an automatic control type manual transmission (AMT) that amplifies or attenuates engine torque at a predetermined gear ratio with hydraulic oil supplied from the hydraulic control circuit 15 and outputs the amplified torque. However, in the present disclosure, the transmission 14 is not limited to the AMT, and other types of transmission mechanisms such as an automatic transmission (AT) may be employed.

  The engine torque is transmitted to the propeller shaft 17 through the fluid coupling 12, the clutch 13, and the transmission 14, and further transmitted to the drive wheel 19 through the differential gear 18.

  The hydraulic control circuit 15 includes, for example, an oil pump, a pressure control valve, a flow rate control valve, an oil cooler (not shown), and the like, and the fluid coupling 12, the clutch 13, and the transmission 14 are controlled according to the control of the control device 10. Supply hydraulic oil.

<Clutch facing temperature estimation process>
The control device 10 performs control for estimating the temperature of the clutch 13 in order to protect the clutch facing which is a friction surface in the clutch 13. Below, the temperature estimation process of the clutch facing by the control apparatus 10 is demonstrated.

  FIG. 2 is a block diagram showing a configuration used in the clutch facing temperature estimation process by the control device 10. As shown in FIG. 2, the control device 10 includes an engine speed sensor 21, a turbine speed sensor 22, a countershaft speed sensor 23, a gear position sensor 24, an atmospheric temperature sensor 25, an oil temperature sensor 26, a flow rate sensor 27, A memory 28 and an ignition key 29 are connected.

  The control device 10 detects information related to the rotational speed of the engine 11 using the engine rotational speed sensor 21.

  The control device 10 uses the turbine rotation speed sensor 22 to detect information related to the rotation speed of the turbine impeller of the fluid coupling 12.

  The control device 10 uses the counter shaft rotation speed sensor 23 to detect information related to the rotation speed of the counter shaft (reverse shaft) of the transmission 14.

  The control device 10 uses the gear position sensor 24 to detect information regarding the current gear position in the transmission 14.

  The control device 10 uses the atmospheric temperature sensor 25 to detect information regarding the atmospheric temperature, that is, the outside temperature of the vehicle 1.

  The control device 10 uses the oil temperature sensor 26 to detect information related to the temperature of the hydraulic oil supplied to the clutch 13.

  The control device 10 uses the flow rate sensor 27 to detect information regarding the flow rate of the hydraulic oil supplied to the clutch 13.

  The memory 28 sequentially stores various parameters used by the control device 10 for estimating the clutch facing temperature and the current clutch facing temperature estimated by the control device 10.

  The ignition key 29 is a start key for the engine 11. The ignition key 29 is an example of a start key of the present disclosure. In the off state of the ignition key 29, the vehicle 1 cannot perform all operations. In the on state of the ignition key 29, the control device 10 starts the engine 11, and the vehicle 1 can perform all operations. As the key position of the ignition key 29, in addition to the off state and the on state, for example, the engine 11 is not started, power is supplied only to each electrical component of the vehicle 1, and only the electrical component can be used. There may be.

  FIG. 3 is a flowchart for explaining an operation example of the control device 10 in the clutch facing temperature estimation process. Note that the flowchart shown in FIG. 3 illustrates the operation of one cycle of the clutch facing temperature estimation process by the control device 10. That is, the control apparatus 10 repeats the process shown in FIG. 3 for every predetermined period. In the present embodiment, one cycle is, for example, 10 milliseconds.

In step S1, the control unit 10, the rotational speed difference between the input side and the output side of the clutch 13 in the current cycle, namely obtaining the slip angular velocity r _D. Specifically, the control device 10 acquires information on the rotation speed of the countershaft of the transmission 14 from the countershaft rotation speed sensor 23, and calculates the rotation speed on the output side of the clutch 13 in the current cycle. Further, since the rotational speed of the input side of the clutch 13 is equal to the rotational speed of the turbine impeller of the fluid coupling 12, information on the rotational speed of the turbine is obtained from the turbine rotational speed sensor 22 and the input side of the clutch 13 in the current cycle. Specify the number of rotations. Then, the control unit 10 calculates the slip angular velocity r _D by using the rotational speed of the calculated output side and the input side speed.

In step S <b> 2, the control device 10 estimates the rising temperature component T <b> ₁ in the current period due to the input energy to the clutch 13. The rising temperature component T ₁ due to the input energy to the clutch 13 is a value indicating how many times the temperature of the clutch facing increases in the current cycle due to the input energy to the clutch 13.

Specifically, the control unit 10 estimates the temperature rise component T ₁ as follows. In other words, the control device 10 calculates the input energy amount e _in of the clutch 13 in the current cycle using the transmission torque T _c of the clutch 13 and the slip angular velocity r _D calculated in step S1. Further, the control device 10 multiplies the calculated input energy amount e _in by a known temperature conversion coefficient c _T , thereby estimating the rising temperature component T ₁ of the clutch facing temperature due to the input energy to the clutch 13.

Specifically, the control device 10 first calculates the input energy amount e _in by multiplying the transmission torque T _c and the slip angular velocity r _D as shown in the following equation (1).
e _in = T _c * r _D (1)

Then, as shown in Equation (2), the input energy amount e _in and the temperature conversion coefficient c _T are multiplied to estimate the rising temperature component T ₁ due to the input energy.
T ₁ = e _in * c _T (2)

The temperature conversion factor c _T is a value determined experimentally using previously clutch 13, may be stored in the memory 28.

In step S3, the control unit 10, in the current cycle, to estimate the descending temperature component T ₂ by the operating oil of the clutch 13 (cooling oil). And falling temperature component T ₂ are, by the cooling effect of the hydraulic oil, which is a value indicating whether the temperature of the clutch facings is lowered again in the current cycle.

Specifically, the control device 10 estimates the lowering temperature component T ₂ as follows. That is, the control device 10 calculates the clutch facing temperature T _{f (p−1)} of the previous cycle calculated by the control device 10 in the previous cycle and stored in the memory 28, and acquires it from the oil temperature sensor 26. and the oil temperature T _o of the hydraulic fluid in the clutch 13, obtained from the flow rate sensor 27, and the flow rate f of the hydraulic oil supplied to the clutch 13 in the current cycle, a coefficient c _co seeking cooling amount of hydraulic oil per unit flow rate using, by the following equation (3) for estimating the lowering temperature component T _2. Note that the coefficient c _co for obtaining the cooling amount by the hydraulic oil per unit flow rate is a value obtained experimentally in advance, and may be stored in the memory 28.
_{T 2 = (T f (p} -1) -T o) * f * c co (3)

In the above mathematical formula (3), the descending temperature component T ₂ is estimated using the flow rate f of the hydraulic oil obtained from the flow rate sensor 27 and the coefficient c _co for obtaining the cooling amount by the hydraulic fluid per unit flow rate. However, the present invention may be such that the vehicle 1 is also in the configuration without the flow rate sensor 27, for example, estimates the lowered temperature component T ₂ using the coefficients and the like for obtaining the average cooling amount per one cycle of the hydraulic oil.

In step S4, the control unit 10, in the current cycle, to estimate the descending temperature component T ₃ according to the amount of heat dissipated into the atmosphere from the clutch 13. And falling temperature component T ₃ is the heat release to the atmosphere that along the housing or the like (not shown) from the clutch 13, is a value that indicates whether the temperature of the clutch facings is lowered again in the current cycle.

Specifically, the control device 10 estimates the lowering temperature component T ₃ in the following manner. That is, the control device 10 reads the clutch of the previous period facing temperature T _f a _(p-1) from the memory 28, the current and ambient temperature T _a obtained from the atmospheric temperature sensor 25, the coefficient c _ca obtaining a cooling amount of the air , And the descending temperature component T ₃ is estimated by the following equation (4). Note that the coefficient c _{ca for obtaining the} amount of cooling by the atmosphere is a value obtained experimentally in advance and may be stored in the memory 28.
T ₃ = (T _{f (p−1)} −T _a ) * c _ca (4)

In the above description, the previous period of the clutch facing temperature _{f (p-1),} estimating the current ambient temperature T _a, and the coefficient c _ca obtaining a cooling amount of the air, with a descending temperature component T ₃ However, the present disclosure is not limited to this. For example, instead of the clutch facings temperature before the period, obtained from the oil temperature sensor 26, by using the oil temperature T _o of the hydraulic fluid in the clutch 13, the difference between the current ambient temperature T _a, the working temperature component T ₃ May be estimated.

  In step S5, the control device 10 determines whether or not it is immediately after the ignition key 29 is changed from the off state to the other state. Specifically, the other state is an on state of the ignition key 29 or a state in which only electrical components can be used. The term “immediately after the ignition key 29 is changed from the off state to another state” means, for example, the first cycle after the ignition key 29 is switched from the off state to the other state. If it is determined that the ignition key 29 is not immediately after being changed from the off state to any other state, the process proceeds to step S6. Otherwise, it is determined that the ignition key 29 is not immediately after being changed from the off state to any other state. If so, the process proceeds to step S7.

In step S6, the control device 10 includes a preceding period of the clutch facing temperature _{T f (p-1),} using the elevated temperature component _{T 1,} and a lowered temperature component _{T 2} and _{T 3,} and the following equation (5 ) To calculate the clutch facing temperature T _{f (p} ) of the current cycle.
_{T f (p) = T f} (p-1) + T 1 -T 2 -T 3 (5)

On the other hand, in step S7, the controller 10 obtains the time the ignition key 29 is off state, in the current cycle, using a falling temperature component T ₃ according to the amount of heat dissipated into the atmosphere from the clutch 13, the ignition key 29 estimating the lowering temperature component T ₄ of the clutch facing temperature between was turned off.

Specifically, the control device 10 estimates the lowering temperature component T ₄ as follows. First, when the ignition key 29 is turned off, the control device 10 stores in the memory 28 information related to the time when the ignition key 29 is turned off. Then, when the ignition key 29 is changed from the off state to the other state and the control device 10 starts operating, the control device 10 uses the current time and the time when the ignition key 29 is turned off to indicate that the ignition key 29 is in the off state. _Find the time t _off .

While the ignition key 29 is in the OFF state, the clutch facing can be considered to decrease in temperature only by heat radiation to the atmosphere. Therefore, it is possible to estimate the descending temperature component T ₄ by the following equation (6).
T ₄ = T ₃ * (t _off / t _p ) (6)

Note that t _p time per one period, i.e. in this embodiment is 10 ms.

In step S8, the controller 10 uses the previous cycle of the clutch facing temperature _{T f (p-1),} and elevated temperature component _{T 1,} and a lowered temperature component _T 2, _{T 3} and _{T 4,} the, following The clutch facing temperature T _{f (p)} in the current cycle is calculated from the equation (7).
_{T f (p) = T f} (p-1) + T 1 -T 2 -T 3 -T 4 (7)

In step S9, the control device 10 stores the calculated clutch facing temperature _{Tf (p)} of the current cycle in the memory 28, and proceeds to the processing of the next cycle.

  By such control, the current clutch facing temperature can be estimated in consideration of the decreasing temperature component of the clutch facing temperature while the ignition key 29 is in the OFF state.

<Action and effect>
As described above, the control device 10 changes the temperature of the clutch facing in the current cycle (rising temperature component T ₁ , falling temperature) based on the difference between the input energy to the clutch 13 and the output energy from the clutch 13 in the current cycle. Component T ₂ and T ₃ ), and the current cycle is a cycle immediately after the ignition key 29 transitions from the off state to another state (on state or a state in which only electrical components can be used), The clutch facing temperature change (decrease temperature component T ₄ ) while the ignition key 29 is in the OFF state is estimated, and the clutch facing temperature T _{f (p−1)} in the cycle immediately before the ignition key 29 transitions to the OFF state. When the temperature change of the clutch facings in the current cycle (temperature rise component T _1, lowering the temperature component T And a T _3), the ignition key 29 is the temperature change of the clutch facings between was turned off (the descending temperature component T _4), on the basis to calculate the clutch facing temperature T _{f (p)} in the current cycle.

  With such a configuration, in the vehicle 1 according to the embodiment of the present disclosure, it is possible to estimate the current clutch facing temperature in consideration of the decreasing temperature component of the clutch facing temperature while the ignition key 29 is in the OFF state. it can. For this reason, the current clutch facing temperature can be accurately estimated. Specifically, even when the operation of the ignition key 29 is frequently repeated between the off state and the other states, the vehicle 1 according to the embodiment of the present disclosure accurately sets the current clutch facing temperature. Can be estimated.

  While various embodiments have been described with reference to the drawings, the present disclosure is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the scope of the disclosure. Understood. In addition, the constituent elements in the above embodiments may be arbitrarily combined without departing from the spirit of the disclosure.

  In the above-described embodiment, the power source of the vehicle 1 is the engine 11 that is an internal combustion engine, but the present disclosure is not limited to this. In the present disclosure, as a power source, in addition to the internal combustion engine, a motor that rotates using electricity charged in the secondary battery may be used, or both the engine and the motor are mounted and used by switching appropriately. It may be.

<Summary of this disclosure>
A clutch facing temperature estimation method of the present disclosure is a clutch facing temperature estimation method for estimating a temperature of the clutch facing for each predetermined time period in a clutch that transmits power of a power source to a subsequent stage by friction of the clutch facing. A step of estimating a temperature change of the clutch facing in the current cycle based on a difference between input energy to the clutch and output energy from the clutch in the current cycle; When the cycle is immediately after the transition to the other state, the step of estimating the temperature change of the clutch facing while the start key is in the off state, and immediately before the start key transitions to the off state Clutch facing temperature in the cycle and the above in the current cycle And the temperature change of the latch facing, and the temperature change of the clutch facings between the starting key is off state, based on, and a step of calculating a clutch facing temperature in the current cycle.

  In the clutch facing temperature estimation method of the present disclosure, the step of estimating the temperature change of the clutch facing in the current cycle is based on a transmission torque of the clutch and a difference in rotational speed between the input side and the output side of the clutch. Estimating a rising temperature component of the clutch facing, and estimating a falling temperature component of the clutch facing based on an amount of heat released from the clutch.

  In the clutch facing temperature estimation method of the present disclosure, the step of estimating the descending temperature component of the clutch facing based on the amount of heat released from the clutch includes the step of decreasing the temperature component based on the amount of heat released from the clutch to the hydraulic fluid of the clutch. Estimating, and estimating a descending temperature component based on the amount of heat released from the clutch to the atmosphere.

  In the clutch facing temperature estimation method according to the present disclosure, the step of estimating a temperature change of the clutch facing while the start key is in the off state includes: from the clutch to the atmosphere while the start key is in the off state. This is a step of estimating a descending temperature component based on the amount of heat release.

  In the clutch facing temperature estimation method according to the present disclosure, when the current cycle is not a cycle immediately after the start key of the power source is changed from the OFF state to the other state, the clutch facing in the cycle immediately before the current cycle is performed. And a step of calculating a temperature of the clutch facing in the current cycle and calculating a clutch facing temperature in the current cycle.

  A clutch facing temperature estimating device of the present disclosure is a clutch facing temperature estimating device that estimates the temperature of the clutch facing for each predetermined time period in a clutch that transmits power of a power source to a subsequent stage by friction of the clutch facing. Based on the difference between the input energy to the clutch in the current cycle and the output energy from the clutch, the temperature change of the clutch facing in the current cycle is estimated, and the start key of the power source is changed from the OFF state to the current cycle. In the cycle immediately after the transition to a state other than the above, the temperature change of the clutch facing is estimated while the start key is in the OFF state, and the clutch facing in the cycle immediately before the start key transitions to the OFF state Temperature and the temperature of the clutch facing in the current cycle Change and the starting key and the temperature change of the clutch facings between was turned off, based on the calculated clutch facing temperature in the current cycle.

  The present disclosure is useful as a clutch facing temperature estimation method and a clutch facing temperature estimation device that can accurately estimate the current clutch facing temperature.

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Control apparatus 11 Engine 12 Fluid coupling 13 Clutch 14 Transmission 15 Hydraulic control circuit 16 Crankshaft 17 Propeller shaft 18 Differential gear 19 Drive wheel 21 Engine speed sensor 22 Turbine speed sensor 23 Countershaft speed sensor 24 Gear position sensor 25 Ambient temperature sensor 26 Oil temperature sensor 27 Flow rate sensor 28 Memory 29 Ignition key

Claims (6)

A clutch facing temperature estimation method for estimating a temperature of the clutch facing for each predetermined time period in a clutch that transmits power of a power source to a subsequent stage by friction of the clutch facing.
Estimating a temperature change of the clutch facing in the current cycle based on a difference between input energy to the clutch in the current cycle and output energy from the clutch;
A step of estimating a temperature change of the clutch facing while the start key is in an off state when the current cycle is a cycle immediately after the start key of the power source is changed from an off state to another state; When,
Based on the clutch facing temperature in the cycle immediately before the start key transitions to the off state, the temperature change of the clutch facing in the current cycle, and the temperature change of the clutch facing during the start key was in the off state. Calculating the clutch facing temperature in the current cycle;
A method for estimating a clutch facing temperature. The step of estimating the temperature change of the clutch facing in the current cycle is as follows:
Estimating a rising temperature component of the clutch facing based on a transmission torque of the clutch and a rotational speed difference between an input side and an output side of the clutch;
Estimating a descending temperature component of the clutch facing based on the amount of heat released from the clutch;
The clutch facing temperature estimation method according to claim 1, comprising: The step of estimating the falling temperature component of the clutch facing based on the amount of heat released from the clutch,
Estimating a descending temperature component based on the amount of heat released from the clutch to the hydraulic fluid of the clutch;
Estimating a descending temperature component based on the amount of heat released from the clutch to the atmosphere;
The clutch facing temperature estimation method according to claim 1, comprising: The step of estimating the temperature change of the clutch facing while the start key is in the off state estimates a descending temperature component based on the amount of heat released from the clutch to the atmosphere while the start key is in the off state. Is a step,
The clutch facing temperature estimation method according to any one of claims 1 to 3. If the current cycle is not the cycle immediately after the power source start key has transitioned from the OFF state to any other state, the clutch facing temperature in the cycle immediately before the current cycle and the clutch facing in the current cycle Calculating the temperature change and the clutch facing temperature in the current cycle;
The clutch facing temperature estimation method according to any one of claims 1 to 4, further comprising: A clutch facing temperature estimating device for estimating a temperature of the clutch facing at a predetermined time period in a clutch that transmits power of a power source to a subsequent stage by friction of the clutch facing,
Based on the difference between the input energy to the clutch in the current cycle and the output energy from the clutch, the temperature change of the clutch facing in the current cycle is estimated,
When the current cycle is a cycle immediately after the start key of the power source transitions from the off state to the other state, the temperature change of the clutch facing is estimated while the start key is in the off state,
Based on the clutch facing temperature in the cycle immediately before the start key transitions to the off state, the temperature change of the clutch facing in the current cycle, and the temperature change of the clutch facing during the start key was in the off state. To calculate the clutch facing temperature in the current cycle,
Clutch facing temperature estimation device.

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