JP7243473B2 - Estimation device, estimation method and estimation program - Google Patents

Description

The present disclosure relates to an estimating device, an estimating method, and an estimating program, and in particular, a technology related to estimating absorbed energy of a synchronizer.

In general, a stepped transmission is configured to establish a desired gear stage by selectively synchronously coupling an idler gear corresponding to each gear stage with a shaft by a synchronizing device (for example, See Patent Documents 1 and 2, etc.).

JP 2011-144853 A Japanese Unexamined Patent Application Publication No. 2012-013106

The synchronizing device absorbs the rotational difference between the input side and the output side each time there is a shift. Therefore, if the components of the synchronizer (for example, a synchronizer ring, etc.) continue to accumulate absorbed energy associated with rotation synchronization, the components may be damaged, which may cause a vehicle to break down on the road. . In order to prevent such road failures, it is desirable to effectively estimate the absorbed energy in the component parts of the synchronizer and to grasp in advance the appropriate replacement timing of the component parts.

The technique of the present disclosure has been made in view of the above circumstances, and aims to effectively estimate the absorbed energy of the synchronizer.

A device of the present disclosure is a device for estimating absorbed energy of a synchronizing device that synchronously couples a transmission gear provided on a shaft of a transmission so as to be able to rotate relative to the shaft, wherein the synchronizing device connects the transmission gear to the shaft. a start determination unit that determines whether or not a synchronous operation for synchronous coupling has started; and a rotation speed that is input from the input side of the transmission to the transmission gear when the start determination unit determines that the synchronous operation has started. and a start rotation speed acquisition storage unit that acquires and stores as the start input rotation speed, a completion determination unit that determines whether or not the synchronization device has completed the synchronous operation of synchronously coupling the transmission gear with the shaft, When the completion determining unit determines that the synchronizing operation is completed, the number of revolutions input to the transmission gear from the input side of the transmission is acquired and stored as the input number of revolutions upon completion. and an absorbed energy calculation section for calculating the absorbed energy of the component parts of the synchronizing device based on the stored rotational speed difference between the input rotational speed at the start and the input rotational speed at the completion. and

The apparatus further includes an inertia estimator for estimating the inertia acting on the component during the synchronizing operation of the synchronizing device, wherein the absorbed energy calculator calculates the inertia based on the product of the rotational speed difference and the estimated inertia. to calculate the absorbed energy of the component.

Further, by accumulating the calculated absorbed energy, the cumulative damage degree of the component is calculated, and when the cumulative damage degree reaches a predetermined upper limit threshold, the life determination unit determines that the component has reached the end of its life. is preferably further provided.

Further, the completion determination unit determines whether the input rotation speed input to the transmission gear from the input side of the transmission changes from an increase to a decrease after the synchronizing operation by the synchronizing device is started, or from a decrease to an increase. It is preferable to determine that the synchronizing operation of the synchronizing device is completed when the synchronizing device has completed.

Further, it is determined whether the speed change by the synchronizing operation of the synchronizing device is upshifting or downshifting based on the change in the input rotation speed input to the transmission gear from the input side of the transmission during the synchronizing operation of the synchronizing device. When the shift determination unit determines that there is a shift up, the absorbed energy calculation unit subtracts the input rotation speed at completion from the input rotation speed at start so that the rotation It is preferable to calculate the rotational speed difference by subtracting the input rotational speed at the start from the input rotational speed at the completion when the shift determination unit determines the shift down.

A method of the present disclosure is a method for estimating absorbed energy of a synchronizing device that synchronously couples a transmission gear provided on a shaft of a transmission so as to be able to rotate relative to the shaft, wherein the synchronizing device connects the transmission gear to the shaft. It is determined whether or not a synchronous operation for synchronous coupling has started, and when it is determined that the synchronous operation has started, the number of rotations input from the input side of the transmission to the transmission gear is acquired, and the input rotation number at the time of start is obtained. and determines whether or not the synchronizing device has completed the synchronizing operation for synchronously coupling the transmission gear with the shaft. is stored as the input rotation speed at completion, and based on the difference in rotation speed between the stored input rotation speed at start and the input rotation speed at completion, the components of the synchronizing device It is characterized by calculating absorbed energy.

The program of the present disclosure causes a computer to determine whether a synchronizing device that synchronously couples a transmission gear rotatably provided on a shaft of a transmission with the shaft has started a synchronizing operation that synchronously couples the transmission gear with the shaft. a start determination unit for determining whether or not the start determination unit determines that the synchronous operation has started, acquires the rotation speed input to the transmission gear from the input side of the transmission, and uses it as the input rotation speed at the start A start rotation speed acquisition storage unit for storing, a completion determination unit for determining whether or not the synchronizing device has completed the synchronizing operation for synchronously coupling the speed change gear with the shaft, and the completion determination unit determining that the synchronizing operation has been completed. a completion rotation speed acquisition storage unit for acquiring the rotation speed input to the transmission gear from the input side of the transmission and storing it as a completion input rotation speed, the stored input rotation speed at the start and the It is characterized by functioning as an absorbed energy calculating section for calculating the absorbed energy of the constituent parts of the synchronizer based on the difference in rotation speed from the input rotation speed at the time of completion.

According to the technique of the present disclosure, it is possible to effectively estimate the absorbed energy of the synchronizer.

1 is a schematic overall configuration diagram showing a power transmission system of a vehicle according to this embodiment; FIG. 1 is a schematic functional block diagram showing a control device according to an embodiment and related peripheral configurations; FIG. 4 is a flow chart for explaining the process of estimating the absorbed energy and the lifetime of the constituent parts of the synchronizer according to the present embodiment.

An estimation device, an estimation method, and an estimation program according to the present embodiment will be described below with reference to the accompanying drawings. The same parts are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[overall structure]
FIG. 1 is a schematic overall configuration diagram showing a power transmission system of a vehicle 1 according to this embodiment.

The vehicle 1 is equipped with an engine 10 as an example of a driving force source. An input shaft 41 of a transmission 40 is connected to a crankshaft 11 of the engine 10 via a clutch device 20 . The propeller shaft 12 is connected to an output shaft 42 (an example of a shaft of the present disclosure) of the transmission 40 . Left and right drive wheels are connected to the propeller shaft 12 via a differential gear device (none of which is shown) and left and right drive shafts.

The driving force source of the vehicle 1 is not limited to the engine 10, and may be a driving motor or a combination of these. Further, the vehicle 1 may be rear-wheel drive, front-wheel drive, or four-wheel drive.

The clutch device 20 connects and disconnects power transmission from the crankshaft 11 to the input shaft 41 . Specifically, when the driver depresses the clutch pedal 22 , the clutch device 20 is switched from a “connected state” that transmits power to a “disconnected state” that cuts off the transmission of power. When the foot is released, the "disconnected state" can be switched to the "connected state".

The clutch device 20 is not limited to the illustrated dry single-plate clutch, and may be a wet multi-plate clutch, a dual clutch, or the like. Moreover, if the transmission 40 is an automatic transmission, the clutch device 20 may be an automatic clutch.

The transmission 40 is a manual transmission that shifts gears according to the driver's operation of a shift operating device 70 provided in the driver's cabin, and mainly includes an input shaft 41, an output shaft 42, a counter shaft 43, and an input gear. It comprises a train 44, a plurality of output gear trains 47, a plurality of synchronizers 50 and the like.

Note that the transmission 40 is not limited to a manual transmission, and may be an automatic transmission (for example, AMT: Automated Manual Transmission) as long as it is a stepped transmission including the synchronizer 50 . Further, the transmission 40 is not limited to the input reduction type shown in the drawings, and may be of the output reduction type.

The input gear train 44 has an input main gear 45 integrally rotatably provided on the input shaft 41 and an input counter gear 46 integrally rotatably provided on the counter shaft 43 and always in mesh with the input main gear 45 .

It should be noted that the input gear train 44 is not limited to the single train shown in the figure, and may be configured to have two trains functioning as a splitter capable of switching between low speed and high speed. Also, at least one of the input main gear 45 and the input counter gear 46 may be an idle gear that can rotate relative to the shafts 41 and 43 . In this case, a synchronizing device 50, which will be described later, may be provided.

A plurality of output gear trains 47 are provided to the output main gear 48 (an example of the speed change gear of the present disclosure) provided to be relatively rotatable on the output shaft 42, and to the counter shaft 43 so as to be integrally rotatable. It has an output counter gear 49 that meshes with it. Output main gear 48 is selectively synchronously coupled with output shaft 42 by synchronizer 50 .

In the illustrated example, the output main gear 48 is an idle gear, but the output counter gear 49 may be an idle gear. In this case, the synchronizing device 50 may be provided on the countershaft 43 side. Also, although not shown, a synchronizing device 50 corresponding to a direct coupling stage that couples the input shaft 41 and the output shaft 42 may be further provided.

The synchronizer 50 includes a hub 51 rotatably provided on the output shaft 42 , a sleeve 52 having inner peripheral teeth that always mesh with the outer peripheral teeth of the hub 51 , and a dog gear rotatably provided on the output main gear 48 . 53 , a tapered cone portion 54 provided on the dog gear 53 , and a synchronizer ring 55 provided between the hub 51 and the dog gear 53 . A shift fork 56 fixed to a shift rod 57 is engaged with the sleeve 52 so as to be movable integrally therewith. The shift rod 57 is connected to a shift operating device 70 via a shift block 58, a shift lever 59, a link mechanism (not shown), and the like.

When the operation lever 71 of the shift operation device 70 is selected from the neutral position by the driver, the synchronizing device 50 is shifted by a shift thrust transmitted through the link mechanism, the shift block 58, the shift rod 57, and the shift fork 56. The sleeve 52 shifts in the shift direction. When the synchronizer ring 55 is pushed along with the shift movement of the sleeve 52 , a synchronous load is generated between the synchronizer ring 55 and the tapered cone portion 54 . When the sleeve 52 and the dog gear 53 are rotationally synchronized by a synchronous load, the sleeve 52 further shifts and fully meshes with the dog gear 53, thereby selectively synchronously coupling the output main gear 48 with the output shaft 42. there is

In the following description, the time when the sleeve 52 starts to shift or the time when a synchronizing load begins to occur between the synchronizer ring 55 and the tapered cone portion 54 is referred to as the "synchronization start" of the synchronizing device 50, and when the sleeve 52 A state in which the dog gear 53 is fully meshed (detented) is referred to as "synchronization completion" of the synchronizer 50, and a state in which the sleeve 52 is engaged only with the hub 51 is referred to as a "neutral state" of the synchronizer 50 or the transmission 40.

The vehicle 1 is provided with various sensors and switches. An engine speed sensor 90 detects an engine speed Ne from the crankshaft 11 . A transmission input rotation speed sensor 91 detects a transmission input rotation speed NT _In from the input gear train 44 or the input shaft 41 . A transmission output rotation speed sensor 92 detects a transmission output rotation speed NT _Out (or vehicle speed V) from the propeller shaft 12 or the output shaft 42 . The neutral switch 93 detects the neutral state from the operating position of the operating lever 71 of the shift operating device 70 . Specifically, the neutral switch 93 is turned ON when the operating lever 71 is operated to the neutral position, and turned OFF when the operating lever 71 is selected from the neutral position. Detection signals from these sensors 90 to 92 and switch 93 are sent to the electrically connected control device 100 .

In addition to the sensors 90 to 92 and the switch 93, the vehicle 1 has a shift stroke sensor that detects the amount of shift movement of the shift rod 57, and a detent switch that detects complete engagement (detent) between the sleeve 52 and the dog gear 53. etc. may be further provided.

[Control device]
FIG. 2 is a schematic functional block diagram showing the control device 100 according to this embodiment and related peripheral configurations.

The control device 100 is, for example, a device such as a computer that performs computation, and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input port, and an output port, which are connected to each other via a bus or the like. etc., and run the estimation program.

Further, by executing the estimation program, the control device 100 controls the synchronization start determination unit 110 (start determination unit), the synchronization start input rotation speed storage unit 120 (start rotation speed acquisition storage unit), the shift determination unit 130, the synchronization completion Judgment unit 140 (completion judgment unit), synchronization completion input rotation speed storage unit 150 (completion rotation speed acquisition storage unit), absorption difference rotation speed calculation unit 160, inertia estimation unit 170, absorbed energy calculation unit 180, life judgment unit 190 and an alarm processing unit 195 . In this embodiment, each of these functional elements is described as being included in the control device 100, which is integrated hardware, but any part of these can also be provided in separate hardware.

Based on the ON/OFF signal transmitted from the neutral switch 93, the synchronization start determination unit 110 determines whether or not the synchronization device 50 has started the synchronization operation. Specifically, when the driver operates the shift operation device 70 to select the operation lever 71 from the neutral position, and the neutral switch 93 is switched from ON to OFF, the synchronization start determination unit 110 determines that the "synchronization start determination unit 110 start”. The determination result of “synchronization start” by the synchronization start determination unit 110 is transmitted to the synchronization start input rotation speed storage unit 120 .

Whether or not the synchronizing device 50 has started the synchronizing operation may be determined based on the sensor value of a shift stroke sensor (not shown).

The synchronization start input rotation speed storage unit 120 is, for example, a non-volatile memory, and when the synchronization start determination unit 110 determines that "synchronization is started", the transmission input rotation speed sensor 91 acquires the transmission speed at that time. The input rotation speed NT _In is stored as the synchronization start input rotation speed NT _{In_A} .

Shift determination unit 130 shifts transmission 40 based on a change in transmission input rotation speed NT _In transmitted from transmission input rotation speed sensor 91 during synchronizing operation of synchronizer 50 (during shifting of transmission 40). It is determined whether the shift operation is an upshift or a downshift. Specifically, if the transmission input rotation speed NT _In obtained during the synchronizing operation of the synchronizer 50 is decreasing, the shift determination unit 130 determines that the shift operation of the transmission 40 is an upshift. On the other hand, shift-up/down determination section 130 determines that the shift operation of transmission 40 is a shift-down if the transmission input rotation speed NT _In obtained during the synchronizing operation of synchronizer 50 is increasing. The determination result by the shift determination unit 130 is transmitted to the absorption difference rotation speed calculation unit 160 .

If the vehicle 1 is equipped with a shift position sensor (not shown), whether the shift operation is an upshift or a downshift may be determined based on the sensor. Alternatively, shift-up or shift-down may be determined based on a change in the ratio (gear ratio) between the transmission input rotation speed NT _In and the transmission output rotation speed NT _Out before and after shifting.

The synchronization completion determination unit 140 determines whether or not the synchronization device 50 has completed the synchronization operation. More specifically, the synchronization completion determining unit 140 performs the synchronous operation when the change in the transmission input rotation speed NT _In transmitted from the transmission input rotation speed sensor 91 is reversed after the synchronizer 50 starts the synchronous operation. is determined to have been completed.

Specifically, the synchronization completion determination unit 140 determines that the transmission input rotation speed NT _In changes from an increase to a decrease in the case of downshifting, and the transmission input rotation speed _NTIn decreases to increases in the case of upshifting. , it is determined that "synchronization is completed". Further, the synchronization completion determination unit 140 _determines that the transmission input Regardless of whether or not the increase/decrease of the rotation speed NT _In is reversed, it is determined that “synchronization is completed”. The determination result of “synchronization completed” by the synchronization completion determination unit 140 is transmitted to the input rotation speed storage unit 150 at the time of synchronization completion.

If the vehicle 1 is equipped with a shift stroke sensor and a detent switch (not shown), completion of synchronization may be determined based on detection signals from these sensors and switches.

The synchronization completion input rotation speed storage unit 150 is, for example, a non-volatile memory, and when the synchronization completion determination unit 140 determines that "synchronization is completed", the transmission input rotation speed sensor 91 acquires the transmission input rotation speed sensor 91 at that time. The input rotation speed NT _In is stored as the input rotation speed NT _{In_B} at the time of completion of synchronization.

The absorption differential rotation speed calculation unit 160 calculates a differential rotation speed ΔNT _In absorbed by the components of the synchronizer 50 (for example, the synchronizer ring 55, the tapered cone section 54, etc.) during gear shifting. Specifically, when the shift determination unit 130 determines that the shift is “up”, the absorption difference rotation speed calculation unit 160 adjusts the input rotation speed NT at the start of synchronization stored in the storage units 120 and 150, respectively. A difference rotation speed ΔNT _In (=NT _{In_A} −NT _{In_B} ) is calculated by subtracting the synchronization completion input rotation speed NT _{In_B} from _{In_A} . On the other hand, when the shift determination unit 130 determines that the shift is “shift down”, the absorption difference rotation speed calculation unit 160 performs synchronization from the synchronization completion input rotation speed NT _{In_B} stored in the storage units 120 and 150, respectively. A differential rotation speed ΔNT _In (=NT _{In_B} −NT _{In_A} ) is calculated by subtracting the starting input rotation speed NT _{In_A} . The difference rotation speed ΔNT _In calculated by the absorption difference rotation speed calculation unit 160 is transmitted to the absorption energy calculation unit 180 .

Inertia estimator 170 estimates inertia (moment of inertia) I acting on components of synchronizer 50 during synchronization operation of synchronizer 50 . Specifically, the memory of the control device 100 stores a previously created map (or numerical data) that defines the relationship between the gear position of the transmission 40 and the inertia I. Inertia estimating section 170 estimates inertia I by referring to the map based on the gear position after shifting. Here, the gear stage after shifting is determined based on the ratio (gear ratio after shifting) between the transmission input rotation speed NT _In (or the engine rotation speed Ne) and the transmission output rotation speed NT _Out . Alternatively, if the vehicle 1 is equipped with a shift position sensor (not shown), the sensor may be used to acquire the information. Inertia I estimated by inertia estimator 170 is transmitted to absorbed energy calculator 180 .

Absorption energy calculation section 180 calculates absorption in components of synchronizer 50 based on the product of difference rotation speed ΔNT _In transmitted from absorption difference rotation speed calculation section 160 and inertia I transmitted from inertia estimation section 170 . Calculate the energy Q. Note that the absorbed energy Q may be calculated from a map referred to based on the rotational speed difference ΔNT _In and the inertia I prepared in advance. Absorbed energy Q calculated by absorbed energy calculation unit 180 is transmitted to life determination unit 190 .

The life determination unit 190 sequentially accumulates the absorbed energy Q transmitted from the absorbed energy calculation unit 180 to calculate the cumulative damage degree D of the component parts of the synchronization device 50, and configures the system based on the accumulated damage degree D. Determine the service life of parts. Specifically, when the calculated cumulative damage degree D of a component reaches a predetermined upper threshold at which fatigue failure may occur, the life determination unit 190 reduces the component to the end of its life (replacement time is imminent). there is). A determination result by the life determination unit 190 is transmitted to the alarm processing unit 195 .

When the service life determination unit 190 determines that a component has reached the end of its service life, the alarm processing unit 195 transmits an instruction signal to display on the display device 200 in the driver's cab that the component needs to be replaced. Note that the warning method is not limited to the display by the display device 200, and may be performed by voice through a speaker or the like. Further, the information requiring replacement of the component parts may be transmitted to the management base station of the vehicle 1, the maintenance shop, or the like by wireless communication or the like.

Next, based on FIG. 3, the process flow for estimating the absorbed energy Q and the lifetime of the components of the synchronizer 50 according to the present embodiment will be described.

In step S100, it is determined whether or not the vehicle 1 is running. Whether or not the vehicle 1 is running may be determined, for example, based on the vehicle speed V (or the transmission output rotation speed NT _Out ) acquired by the transmission output rotation speed sensor 92 . If the vehicle speed V is greater than 0 (zero) (Yes), it is determined that the vehicle 1 is running, and the control proceeds to step S110. On the other hand, if the vehicle speed V is 0 (zero) (No), it is determined that the vehicle 1 is stopped, and this control repeats the determination process of step S100.

In step S110, it is determined whether or not the synchronization device 50 has started the synchronization operation. When the neutral switch 93 is switched from ON to OFF, this control determines that "synchronization is started" (Yes), and proceeds to the processing of step S120. On the other hand, if the neutral switch 93 has not been switched from ON to OFF (No), the control returns to step S100.

In step S120, the transmission input rotation speed NT _In acquired by the transmission input rotation speed sensor 91 when "synchronization start" is determined in step S110 is stored as the input rotation speed NT _{In_A} at the start of synchronization.

Next, in step S130, it is determined whether or not the synchronization device 50 has completed the synchronization operation. When the increase/decrease in the transmission input rotation speed NT _In transmitted from the transmission input rotation speed sensor 91 is reversed, this control determines that "synchronization is completed" (Yes), and proceeds to the processing of step S150. On the other hand, if the increase/decrease in the transmission input rotation speed NT _In is not reversed (No), the control proceeds to step S140.

In step S140, it is determined whether or not the elapsed time T from when it is determined that "synchronization is started" in step S110 has reached a predetermined upper limit threshold time _TMax . When the elapsed time T reaches the upper limit threshold time T _Max , regardless of the determination result of step S130, this control determines that "synchronization is completed" (Yes), and proceeds to the process of step S150. On the other hand, if the elapsed time T has not reached the upper threshold time T _Max (No), the control returns to step S130.

In step S150, the transmission input rotation speed NT _In acquired by the transmission input rotation speed sensor 91 when it is determined that "synchronization is completed" in step S130 or step S140 is used as the input rotation speed at the time of synchronization completion NT _{In_B} . Remember.

Next, in step S160, it is determined whether or not the transmission input rotation speed NT _In acquired by the transmission input rotation speed sensor 91 has decreased during the synchronizing operation from "synchronization start" to "synchronization completion". If the transmission input rotation speed NT _In is decreasing (Yes), the control proceeds to step S170, where it is determined that the current shift operation is an upshift. On the other hand, if the transmission input rotation speed NT _In has not decreased (No), that is, if the transmission input rotation speed NT _In has increased, the control proceeds to step S180, and the current speed change operation is performed. It is judged as a downshift.

If it is determined in step S170 that the shift is up, the control proceeds to step S175, and the input rotation speed NT _{In_B} at the completion of synchronization stored in step S150 is subtracted from the input rotation speed NT _{In_A} at the start of synchronization stored in step S120. By doing so, the differential rotation speed ΔNT _In (=NT _{In_A} −NT _{In_B} ) is calculated.

On the other hand, if it is determined in step S180 to shift down, the control proceeds to step S185, and the synchronization start input rotation speed NT _{In_A} stored in step S120 is changed from the synchronization completion input rotation speed NT _{In_B} stored in step S150. By subtracting, the rotational speed difference ΔNT _In (=NT _{In_B} −NT _{In_A} ) is calculated.

In step S190, the inertia I acting on the components of the synchronizing device 50 is calculated based on the gear position after shifting.

Next, in step S195, based on the product of the difference rotation speed ΔNT _In calculated in step S175 or step S185 and the inertia I calculated in step S190, the absorbed energy Q in the components of the synchronizer 50 is calculated. . Next, in step S200, by accumulating the absorbed energy Q, the cumulative damage degree D of the components of the synchronizer 50 is calculated.

In step S210, it is determined whether or not the cumulative degree of damage D has reached a predetermined upper threshold. If the cumulative degree of damage D has reached the upper limit threshold (Yes), the control proceeds to step S220, issues an alarm notifying that the components of the synchronization device 50 need to be replaced, and then terminates. On the other hand, in step S210, if the cumulative degree of damage D has not reached the upper threshold (No), the control returns to step S100.

According to the present embodiment described in detail above, when the synchronizer 50 starts the synchronizing operation, the input rotation speed NT _{In_A} at the start of synchronization acquired by the transmission input rotation speed sensor 91 and the synchronization operation of the synchronizer 50 is completed, the absorbed energy Q of the synchronizer 50 is calculated based on the difference rotation speed ΔNT _In from the input rotation speed NT _{In_B} at the time of synchronization completion acquired by the transmission input rotation speed sensor 91, and the absorbed energy Q is calculated. Based on the cumulative damage degree D obtained by accumulating the energy Q, the lifetime of the components of the synchronizer 50 is determined. As a result, it becomes possible to reliably estimate the absorbed energy Q in the component parts of the synchronizer 50 with a simple configuration, and to effectively grasp the life of the component parts.

Also, the synchronization start of the synchronizing device 50 is determined based on the ON/OFF state of the neutral switch 93, and the synchronization completion of the synchronizing device 50 and the shift up/down of the transmission 40 are acquired by the transmission input rotation speed sensor 91. By making judgments based on changes in the transmission input speed NT _In , it becomes possible to make judgments without using a shift stroke sensor, detent switch, shift position sensor, etc., and it is effective to reduce costs due to an increase in sensors. can be reduced to

[others]
It should be noted that the present disclosure is not limited to the embodiments described above, and can be appropriately modified and implemented without departing from the gist of the present disclosure.

For example, in the _above embodiment, the absorbed energy Q is calculated based on the product of the rotational speed difference ΔNT _In and the inertia I. In addition, the temperature of lubricating oil supplied to the synchronizer 50 may be included in the calculation.

1 Vehicle 10 Engine 11 Crankshaft 12 Propeller Shaft 20 Clutch Device 40 Transmission 41 Input Shaft 42 Output Shaft 43 Countershaft 44 Input Gear Train 47 Output Gear Train 50 Synchronizer 51 Hub 52 Sleeve 53 Dog Gear 54 Tapered Cone Part 55 Synchronizer Ring 90 Engine Rotation speed sensor 91 Transmission input rotation speed sensor 92 Transmission output rotation speed sensor 93 Neutral switch 100 Control device 110 Synchronization start determination unit (start determination unit)
120 Synchronization start input rotation speed storage unit (start rotation speed acquisition storage unit)
130 shift determination unit 140 synchronization completion determination unit (completion determination unit)
150 Synchronization Completion Input Rotation Speed Storage Unit (Completion Rotation Speed Acquisition Storage Unit)
160 Absorption difference rotation speed calculator 170 Inertia estimator 180 Absorbed energy calculator 190 Life determination unit

Claims (6)

An apparatus for estimating absorbed energy of a synchronizing device that synchronously couples a speed change gear rotatably provided on an output shaft of a transmission with the output shaft,
a transmission input rotation speed sensor for detecting the rotation speed of a counter shaft of the transmission, wherein a counter gear constantly meshing with the transmission gear is rotatably provided;
a start determination unit that determines whether or not the synchronizer has started a synchronizing operation for synchronously coupling the speed change gear with the output shaft ;
a start rotation speed acquisition storage unit that acquires the rotation speed detected by the transmission input rotation speed sensor when the start determination unit determines that the synchronous operation has started, and stores the rotation speed as a start input rotation speed;
a completion determination unit that determines whether or not the synchronizer has completed a synchronizing operation for synchronously coupling the speed change gear with the output shaft;
a completion rotation speed acquisition storage unit that acquires the rotation speed detected by the transmission input rotation speed sensor when the completion determination unit determines that the synchronous operation is completed, and stores the rotation speed as a completion input rotation speed;
an inertia estimator for estimating inertia acting on components of the synchronizer during a synchronization operation of the synchronizer;
an absorbed energy calculation unit for calculating the absorbed energy of the component based on the product of the stored rotational speed difference between the input rotational speed at the start and the input rotational speed at the completion and the estimated inertia ; An estimating device characterized by comprising: a life determination unit that calculates the cumulative damage degree of the component by accumulating the calculated absorbed energy, and determines that the component has reached the end of its life when the cumulative damage degree reaches a predetermined upper threshold value; The estimating device according to claim 1 , comprising: The completion judging section determines whether the input rotation speed input from the input side of the transmission to the transmission gear changes from an increase to a decrease after the synchronizing operation is started by the synchronizing device, or when the input rotation speed changes from a decrease to an increase. 3 . Whether the speed change by the synchronizing operation of the synchronizing device is an upshift or a downshifting based on a change in the input rotation speed input to the transmission gear from the input side of the transmission during the synchronizing operation of the synchronizing device. further comprising a shift determination unit that determines
When the shift determination unit determines to shift up, the absorbed energy calculation unit calculates the rotation speed difference by subtracting the completion input rotation speed from the start input rotation speed. The estimating device according to any one of claims 1 to 3 , wherein, when it is determined to be down, the rotation speed difference is calculated by subtracting the starting input rotation speed from the completion input rotation speed. A method for estimating absorbed energy of a synchronizing device that synchronously couples a speed change gear rotatably provided on an output shaft of a transmission with the output shaft, comprising:
determining whether the synchronizing device has initiated a synchronizing operation to synchronously couple the transmission gear with the output shaft ;
When it is determined that the synchronous operation has started, a transmission input rotation speed sensor detects the rotation speed of a counter shaft of the transmission, in which a counter gear that is always in mesh with the transmission gear is rotatably provided. a step of acquiring the rotation speed obtained and storing it as the input rotation speed at the start;
determining whether the synchronizing device has completed a synchronizing operation to synchronously couple the transmission gear with the output shaft ;
a step of acquiring the rotation speed detected by the transmission input rotation speed sensor when it is determined that the synchronous operation is completed and storing it as the input rotation speed at the time of completion;
estimating the inertia acting on components of the synchronizer during synchronized operation of the synchronizer;
calculating the absorbed energy of the component based on the product of the estimated inertia and the difference between the stored input rotation speed at the start and the input rotation speed at the completion. . the computer,
Determining whether or not a synchronizing device for synchronously coupling a transmission gear rotatably provided on an output shaft of a transmission with the output shaft has started a synchronous operation for synchronously coupling the transmission gear with the output shaft. start determination unit to
A transmission input for detecting the number of revolutions of a counter shaft of the transmission, wherein a counter gear that is always meshed with the transmission gear is rotatably provided when the start determination unit determines that the synchronous operation has started. a start rotation speed acquisition storage unit that acquires the rotation speed detected by the rotation speed sensor and stores it as a start input rotation speed;
a completion determination unit that determines whether or not the synchronizer has completed a synchronizing operation for synchronously coupling the speed change gear with the output shaft ;
a completion rotation speed acquisition storage unit that acquires the rotation speed detected by the transmission input rotation speed sensor when the completion determination unit determines that the synchronous operation is completed, and stores the rotation speed as a completion input rotation speed;
an inertia estimator for estimating inertia acting on components of the synchronizer during synchronization operation of the synchronizer; and
Functioning as an absorbed energy calculating section for calculating the absorbed energy of the component based on the product of the stored rotational speed difference between the input rotational speed at the start and the input rotational speed at the completion and the estimated inertia. An estimation program characterized by letting

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