JP2022018342A - Failure detection device and failure detection method - Google Patents

Abstract

To provide a failure detection device and a failure detection method, capable of detecting failure of a damper spring in advance.SOLUTION: A failure detection device is a device that detects a failure of a clutch mechanism provided between a driving force source of a vehicle and a transmission. The failure detection device has: a calculation unit that calculates an amount of rotational fluctuation on a driving force source side with respect to a clutch disc included in the clutch mechanism and an amount of rotational fluctuation on the transmission side with respect to the clutch disc; and a determination unit that determines whether or not a damper spring provided on the clutch disc has failed based on the amount of rotation fluctuation on the driving force source side and the amount of rotation fluctuation on the transmission side.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a failure detection device for detecting a failure of a vehicle clutch mechanism and a failure detection method.

Conventionally, it is known that a vehicle is provided with a clutch mechanism including a clutch disc between an engine and a transmission (see, for example, Patent Document 1).

Further, it is known that the clutch disc is provided with a damper spring for absorbing an impact.

Japanese Unexamined Patent Publication No. 2008-202752

If a failure (for example, damage) occurs in the damper spring, there is a risk of causing a failure of a device other than the clutch mechanism. For example, if a part of the damaged damper spring bites into the starter, the starter may break down.

Further, if a failure occurs in the damper spring, the life of the synchromesh of the transmission may be shortened.

However, it is difficult to visually grasp the failure of the damper spring from the outside.

An object of one aspect of the present disclosure is to provide a failure detection device and a failure detection method capable of detecting a failure of a damper spring in advance.

The failure detection device according to one aspect of the present disclosure is a failure detection device for detecting a failure of the clutch mechanism provided between the driving force source of the vehicle and the transmission, from the clutch disk included in the clutch mechanism. Also, a calculation unit that calculates the amount of rotation fluctuation on the driving force source side and the amount of rotation fluctuation on the transmission side of the clutch disk, the amount of rotation fluctuation on the driving force source side, and the rotation on the transmission side. It has a determination unit for determining whether or not the damper spring provided on the clutch disk has failed based on the amount of fluctuation.

The failure detection method according to one aspect of the present disclosure is a failure detection method for detecting a failure of the clutch mechanism provided between the driving force source of the vehicle and the transmission, from the clutch disk included in the clutch mechanism. Also, the step of calculating the rotation fluctuation amount on the driving force source side and the rotation fluctuation amount on the transmission side from the clutch disk, the rotation fluctuation amount on the driving force source side, and the rotation fluctuation on the transmission side. It has a step of determining whether or not the damper spring provided on the clutch disc has failed based on the amount.

According to the present disclosure, it is possible to detect a failure of the damper spring in advance.

The figure which shows typically the failure detection system which concerns on embodiment of this disclosure. A block diagram showing a configuration of a failure detection device according to an embodiment of the present disclosure. A flowchart showing the operation of the failure detection device according to the embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

First, the configuration of the failure detection system 1 of the present embodiment will be described with reference to FIG. FIG. 1 is a diagram schematically showing the failure detection system 1 of the present embodiment.

Each component (referenced portion) of the failure detection system 1 shown in FIG. 1 is mounted on a vehicle (not shown). The vehicle may be a commercial vehicle (for example, a truck, a bus, etc.) or a passenger car.

Although not shown, the vehicle is equipped with an engine (an example of a driving force source) and a transmission. The engine may be a diesel engine or a gasoline engine. The transmission is, for example, a mechanical automatic transmission.

As shown in FIG. 1, the failure detection system 1 includes a clutch mechanism 10, an engine crankshaft 20 (hereinafter, simply referred to as a crankshaft 20), a transmission input shaft 30 (hereinafter, simply referred to as an input shaft 30), and the like. It has a flywheel 40, an engine rotation speed sensor 50, an input shaft rotation speed sensor 60, and a failure detection device 100.

As shown in FIG. 1, the clutch mechanism 10 includes a clutch disc 11, a clutch cover 14, a pressure plate 15, and a diaphragm spring 16. The clutch disc 11 has a damper spring 12 and a clutch fading 13.

Although not shown, the clutch mechanism 10 is housed in, for example, a substantially cylindrical clutch housing.

The crankshaft 20 and the input shaft 30 are connected to each other via a clutch mechanism 10 so as to be connectable and disconnectable.

A flywheel 40 is fixed to the output end of the crankshaft 20. A clutch cover 14 is provided on the output side side surface of the flywheel 40. A pressure plate 15 and a diaphragm spring 16 are provided between the flywheel 40 and the clutch cover 14.

A clutch disc 11 is provided at the input end of the input shaft 30 so as to be movable in the axial direction.

In the vicinity of the crankshaft 20, an engine rotation speed sensor 50 that detects the rotation speed of the engine (which may be called the crankshaft 20) is provided. The engine rotation speed sensor 50 detects the rotation speed of the crankshaft 20 and notifies the failure detection device 100.

An input shaft rotation speed sensor 60 for detecting the rotation speed of the input shaft 30 is provided in the vicinity of the input shaft 30. The input shaft rotation speed sensor 60 detects the rotation speed of the input shaft 30 and notifies the failure detection device 100.

The failure detection device 100 is a device that detects a failure of the clutch mechanism 10 (more specifically, the damper spring 12). The failure detection device 100 is electrically connected to each of the engine rotation speed sensor 50 and the input shaft rotation speed sensor 60. Details of the failure detection device 100 will be described later with reference to FIGS. 2 and 3.

The configuration of the failure detection system 1 has been described above.

Next, the configuration of the failure detection device 100 will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the failure detection device 100.

Although not shown, the failure detection device 100 includes, for example, a CPU (Central Processing Unit), a storage medium such as a ROM (Read Only Memory) containing a control program, a work memory such as a RAM (Random Access Memory), and the like. Have. The function of the failure detection device 100 described below is realized by the CPU reading the control program from the ROM and executing it on the RAM. Examples of the failure detection device 100 include an ECU (Electronic Control Unit).

As shown in FIG. 2, the failure detection device 100 includes a calculation unit 110 and a determination unit 120.

The calculation unit 110 is based on the rotation speed of the crankshaft 20 notified from the engine rotation speed sensor 50, and the rotation fluctuation amount on the engine side (which may be referred to as the upstream side) of the clutch disk 11 (hereinafter, engine side rotation). The amount of fluctuation) is calculated.

Further, the calculation unit 110 is based on the rotation speed of the input shaft 30 notified from the input shaft rotation speed sensor 60, and the rotation fluctuation amount on the transmission side (which may be said to be the downstream side) of the clutch disk 11 (hereinafter,). , The amount of rotation fluctuation on the transmission side) is calculated.

The rotation fluctuation amount is, for example, an amount in which the rotation speed changes in one rotation. That is, the amount of rotation fluctuation on the engine side is an amount in which the rotation speed changes in one rotation of the crankshaft 20. Further, the amount of rotation fluctuation on the transmission side is an amount in which the rotation speed changes in one rotation of the input shaft 30.

The determination unit 120 determines whether or not the rotation fluctuation amount on the engine side is equal to or less than the rotation fluctuation amount on the transmission side.

When the engine-side rotation fluctuation amount is not equal to or less than the transmission-side rotation fluctuation amount, the determination unit 120 determines that the damper spring 12 has not failed.

On the other hand, when the rotation fluctuation amount on the engine side is equal to or less than the rotation fluctuation amount on the transmission side, the determination unit 120 determines that the damper spring 12 is out of order.

When it is determined that the damper spring 12 is out of order, the determination unit 120 may control a predetermined device to execute the notification to that effect. For example, the determination unit 120 turns on a lamp (not shown) in the vehicle interior, displays a message image indicating that the damper spring 12 is out of order on a display (not shown) in the vehicle interior, or makes a warning sound or a message. Sound may be output from a speaker (not shown) in the vehicle interior. As a result, the occupant of the vehicle can easily recognize that the damper spring 12 has failed.

The configuration of the failure detection device 100 has been described above.

Next, the operation of the failure detection device 100 will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the failure detection device 100. The flow of FIG. 3 is started, for example, when the engine is started.

First, the calculation unit 110 calculates the engine-side rotation fluctuation amount based on the rotation speed of the crankshaft 20 notified from the engine rotation speed sensor 50 (step S11).

Next, the calculation unit 110 calculates the transmission side rotation fluctuation amount based on the rotation speed of the input shaft 30 notified from the input shaft rotation speed sensor 60 (step S12).

The order of steps S11 and S12 may be reversed.

Next, the determination unit 120 determines whether or not the engine-side rotation fluctuation amount is equal to or less than the transmission-side rotation fluctuation amount (step S13).

When the engine-side rotation fluctuation amount is not equal to or less than the transmission-side rotation fluctuation amount (step S13: NO), the determination unit 120 determines that the damper spring 12 has not failed (step S14). In this case, the flow ends once, but is repeated from step S11 again.

On the other hand, when the rotation fluctuation amount on the engine side is equal to or less than the rotation fluctuation amount on the transmission side (step S13: YES), the determination unit 120 determines that the damper spring 12 is out of order (step S15).

Although not shown, after step S15, the determination unit 120 notifies a predetermined device (for example, a lamp, a display, a speaker, etc. in the vehicle interior) so as to notify that the damper spring 12 has failed. ) May be controlled.

The operation of the failure detection device 100 has been described above.

As described above, the failure detection device 100 of the present embodiment is characterized in that it determines whether or not the damper spring 12 has failed based on the engine side rotation fluctuation amount and the transmission side rotation fluctuation amount. do. Therefore, the failure of the damper spring 12 can be easily detected in advance without visually checking the damper spring 12 from the outside. As a result, it is possible to prevent the failure of the device other than the clutch mechanism 10 and the shortening of the life due to the failure of the damper spring 12.

It should be noted that the present disclosure is not limited to the description of the above embodiment, and various modifications can be made without departing from the spirit of the present embodiment.

[Modification example]
For example, in step S13 of FIG. 3, the determination unit 120 determines whether or not the value obtained by subtracting the engine-side rotation fluctuation amount from the transmission-side rotation fluctuation amount is equal to or greater than a predetermined threshold value (for example, zero). You may. Then, when the above value is equal to or greater than the threshold value, the determination unit 120 may determine that the damper spring 12 is out of order.

The failure detection device and the failure detection method of the present disclosure are useful in all techniques for detecting a failure of a vehicle clutch mechanism (particularly, a damper spring).

10 Clutch mechanism 11 Clutch disc 12 Damper spring 13 Clutch facing 14 Clutch cover 15 Pressure plate 16 Diaphragm spring 20 Crankshaft 30 Input shaft 40 Flywheel 50 Engine rotation speed sensor 60 Input shaft rotation speed sensor 100 Failure detection device 110 Calculation unit 120 Judgment Department

Claims (6)

It is a failure detection device that detects a failure of the clutch mechanism provided between the driving force source of the vehicle and the transmission.
A calculation unit that calculates the amount of rotational fluctuation on the driving force source side of the clutch disc included in the clutch mechanism and the amount of rotational fluctuation on the transmission side of the clutch disc.
It has a determination unit for determining whether or not the damper spring provided on the clutch disc has failed based on the rotation fluctuation amount on the driving force source side and the rotation fluctuation amount on the transmission side.
Failure detection device. The determination unit
When the rotation fluctuation amount on the driving force source side is equal to or less than the rotation fluctuation amount on the transmission side, it is determined that the damper spring provided on the clutch disc is out of order.
The failure detection device according to claim 1. The determination unit
When the value obtained by subtracting the rotation fluctuation amount on the driving force source side from the rotation fluctuation amount on the transmission side is equal to or more than a predetermined threshold value, it is determined that the damper spring provided on the clutch disk is out of order. ,
The failure detection device according to claim 1. The calculation unit
Based on the rotation speed of the crankshaft of the driving force source, the amount of rotation fluctuation on the driving force source side is calculated.
The amount of rotation fluctuation on the transmission side is calculated based on the rotation speed of the input shaft of the transmission.
The failure detection device according to any one of claims 1 to 3. The amount of rotation fluctuation on the driving force source side is an amount in which the rotation speed changes in one rotation of the crankshaft.
The amount of rotation fluctuation on the transmission side is an amount at which the rotation speed changes in one rotation of the input shaft.
The failure detection device according to claim 4. It is a failure detection method that detects a failure of the clutch mechanism provided between the driving force source of the vehicle and the transmission.
A step of calculating a rotation fluctuation amount on the driving force source side of the clutch disc included in the clutch mechanism and a rotation fluctuation amount on the transmission side of the clutch disc.
It has a step of determining whether or not the damper spring provided on the clutch disc has failed based on the rotation fluctuation amount on the driving force source side and the rotation fluctuation amount on the transmission side.
Failure detection method.

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