JPS6237223A - Clutch facing abrasion alarm device - Google Patents

Abstract

PURPOSE:To improve the alarm accuracy and the reliability by deciding whether it is artificial slippage of clutch on the basis of engine induced torque and clutch transmissionable torque and producing an alarm upon occurrence of artificial slippage. CONSTITUTION:Upon provision of outputs from engine rotation sensor 15, clutch rotation sensor 16 to a microcomputor 14, it will calculate the slippage of clutch 27 thus to decide whether the clutch 27 is slipping. The microcomputer 14 will read out the stepping amount of accelerator pedal 23 by an accelerator stroke sensor 24 to calculate the torque Te produced from an engine 10 while to calculate the clutch transmission torque Tc on the basis of stroke 27 of clutch actuator 19 thus to decide whether the slippage is intentional comparing them. When it is not intentional, alarm means 28 is functioned. Consequently, the reliability of alarm can be improved.

Description

[Detailed description of the invention]

FIELD OF INDUSTRIAL APPLICATION] The present invention relates to a clutch facing wear warning device,
In particular, the present invention relates to an alarm device that issues an alarm to inform the user that it is time to replace the clutch due to clutch slippage caused by wear of the clutch facing. KSummary of the Invention The present invention provides a device that generates an alarm to notify that it is time to replace the clutch when the clutch slips due to wear of the clutch facing. In addition, by comparing these calculation results, if the torque generated by the engine is greater than the torque that can be transmitted by the clutch, it is assumed that the clutch is intentionally slipping. If the clutch is slipping and the clutch is slipping, a warning is issued to notify the driver that it is time to replace the clutch. This is to prevent the above-mentioned alarm means from malfunctioning in such cases.

[Conventional technology]

Generally, in automobiles, a clutch is provided between the engine and the transmission in order to temporarily disconnect the engine and drive wheels and enable the transmission to change gears. This clutch is designed to transmit torque through frictional coupling of clutch facings provided on the clutch disc, and the engagement and separation of the clutch facings connects and disconnects the engine and transmission. .

[Problems to be solved by the invention]

In such conventional clutches, when the facings wear, the clutch may slip. If this slip becomes too large, it will cause problems in the running of the vehicle. Conventionally, the driver judges the engine speed and the degree of acceleration of the vehicle by feeling, and based on this judgment, the wear of the clutch facing is known, and the clutch facing is replaced based on this judgment. I was trying to do this. Therefore, the above-mentioned replacement is not always carried out accurately, and in some cases, the facing may be used even after its wear limit has been exceeded. The present invention has been made in view of these problems, and provides a clutch facing wear warning that accurately notifies the replacement time from clutch slippage due to clutch facing wear and prevents the warning from being issued due to malfunction. The purpose is to provide a device. Means for Solving Problem K] The present invention provides a device that issues an alarm to notify the time for replacement due to clutch slippage due to wear of the clutch facing, as shown in FIG. a means for calculating the torque generated by the engine; a means for calculating the transferable torque of the clutch; and a comparison of the torque generated by the engine and the transferable torque of the clutch calculated by the two calculation means. and means for determining whether or not the clutch is intentionally slipping, and the above-mentioned alarm is generated when the clutch is slipping even though the clutch is not intentionally slipping. It is. Here, the case where the clutch is intentionally slipped refers to the case where a starting operation, a creep operation, etc. are performed. Therefore, according to the present invention, an accurate warning is issued only when the clutch is slipping and not when the clutch is intentionally slipping, and this makes it possible to determine when it is time to replace the clutch. It becomes possible to notify accurately. Furthermore, the alarm means will not malfunction during operations such as half-clutching or creeping. K Embodiment The present invention will be described below with reference to an illustrated embodiment. FIG. 2 shows an engine equipped with a clutch facing wear warning device according to an embodiment of the present invention,
This engine is comprised of, for example, a diesel engine 10 for a truck. A fuel injection pump 11 is provided on the side of the engine 10, and is configured to sequentially inject and supply fuel to each cylinder of the engine 10. Further, this fuel injection pump 11 is driven by the engine 10 via a timer 12, and the injection timing is adjusted by the timer 12. The fuel injection pump 11 also includes an actuator 13, which moves a control rack to control the amount of fuel supplied. And the actuator 13 is the microcomputer 1
It is controlled by 4. The microcomputer 14 includes a rotation detection sensor 15 that detects the rotation of the engine 10 and a rack position sensor 1 that detects the position of the control rack of the fuel injection pump 11.
6 detection outputs are respectively input. The flywheel housing 1 is located on the back side of the engine 10.
7 is provided, and a transmission 18 is disposed on the rear side of the housing 17. The clutch on the rear side of the flywheel disposed within the flywheel housing 17 is controlled in its engagement and disengagement by a single clutch actuator. The transmission 18 also includes a shift actuator 20 and a selection actuator 21 for selecting gear positions. The transmission 18 is also provided with a vehicle speed sensor 22 that detects the rotation speed on the output side of the transmission 18, and a gear position detection sensor 25 that detects the gear position of the transmission 18. The information is inputted into the computer 14. Furthermore, an accelerator stroke sensor 24 for detecting depression f of the accelerator pedal 23 is connected to the microcomputer 14. Further, on the inlet side of the transmission 18, a clutch rotation detection sensor 26 is provided to detect the rotation speed of the clutch provided in the flywheel housing 17, and this detection output is also input to the microcomputer 14. It has become so. Further, a clutch sensor 1 to a low torque sensor 27 for detecting the stroke of the clutch from the output side of the clutch actuator 19 are provided, and are connected to the microcomputer 14. Further, an alarm means 28 is connected to the output side of the microcomputer 14, and this alarm means 28 is designed to notify that it is time to replace the clutch due to clutch slippage due to wear of the clutch facing. Furthermore, this alarm means 28
may consist of a warning lamp or a warning buzzer. Next, the operation of the clutch in the flywheel housing 17 provided between the engine 10 and the transmission 18 according to the above configuration, and the alarm operation accompanying the detection of its slippage will be explained. This is achieved by the microcomputer 14 based on the flowchart 1 shown in FIG.
The rotation speed of the clutch is read using the clutch rotation detection sensor 26 based on the rotation speed of the input side of 8. The clutch slip amount is then calculated from a comparison of the rotational speeds of the two sensors 15 and 26. Based on this result, it is determined whether the clutch is slipping. If the clutch is not slipping, the alarm means 28 outputs v! Does not generate III. On the other hand, if the microcomputer 14 determines that the clutch is slipping, it next determines whether the clutch is slipping intentionally. That is, the microcomputer 14 is connected to the accelerator pedal 23.
The accelerator stroke sensor 24 reads the bottom of the depression. With this stroke, from the map stored in advance in the ROM of the microcomputer 14,
The torque Te generated by the engine 10 is calculated. Next, this microcomputer 14 reads the output stroke of one clutch actuator using the clutch stroke sensor 27, and detects the stroke of the clutch. The clutch's transmittable torque l''c is then calculated from this clutch stroke and a map of the clutch's transmittable torque stored in advance in the ROM of the microcomputer 14.In general, the torque Te generated by the engine 10 is is larger than the transferable torque TO of the clutch, it means that a starting operation, a creep operation, etc. are being performed based on instructions from the microcomputer 14 or by manual operation, and in this case, the clutch is This is a case where the clutch is slipping intentionally or intentionally. Therefore, in this case, the microcomputer 14 does not issue an alarm by the alarm means 28. On the other hand, the generated torque Te of the engine 10 If the transferable torque Tc of the clutch is greater than , then the clutch will not slip in the first place. However, if the clutch is slipping at this time, then
We believe this is due to wear on the clutch facing. In this case, the microcomputer 14 operates an alarm means 28 for notifying the replacement time based on clutch slippage. As described above, according to the alarm device according to the present embodiment, the calculated value or theoretical value of the transferable torque of the clutch is obtained, and this theoretical value is compared with the generated torque of the engine 10, and the transferable torque TO of the clutch is calculated. The generated torque TO of the engine 10 is also larger, and the alarm means 28 issues an alarm only when slipping occurs in the clutch even though the clutch is not intentionally slipping. Therefore, with this configuration, it is possible to reliably notify the replacement time based on clutch slippage, and it is possible to compensate for the inaccuracy of conventional judgments based on feeling, and to replace the clutch at the appropriate time. You will be able to do this. This also makes it possible to prevent the clutch facing from becoming too worn and damaging the inside of the clutch. Since the alarm operation is prevented in the case of intentional slippage of the clutch, malfunctions are prevented. Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the above embodiment, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, the torque generated by the engine 10 is calculated based on the detected output of the accelerator stroke sensor 24 that detects the amount of depression of the accelerator pedal 23, but instead of this sensor 24, the fuel injection pump 11
The rack position of the control rack of the engine 1 is detected by the sensor 16, and the engine 1 is
The generated torque of 0 may be calculated. Further, in the above embodiment, the transmittable torque of the clutch is calculated based on the detected output of the clutch stroke sensor 27, but this clutch is constituted by a hydraulic clutch, and the torque applied to the hydraulic cylinder of the hydraulic clutch is The transmission torque of the clutch may be calculated from the oil pressure. [Effects of the Invention] As described above, the present invention provides a means for detecting whether slippage has occurred in the clutch, a means for reducing the torque generated by the engine, a means for calculating the transmittable torque of the clutch, and the above-mentioned method. and a means for determining whether or not the clutch is intentionally slipping from a comparison between the generated torque of the engine and the transmittable torque of the clutch calculated by two calculation means, and the clutch is intentionally slipping. This system is designed to generate an alarm if the clutch is slipping even though it is not. Therefore, according to the present invention, it is possible to accurately detect clutch slippage due to wear of the clutch facing and to accurately notify replacement time, and it is also possible to prevent warnings based on malfunctions.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a warning device showing the gist of the present invention, FIG. 2 is a front view showing an engine equipped with this warning device, and FIG. 3 is a flowchart showing the operation of the warning device. In addition, in the symbols used in the drawings, 10...Diesel engine 14...Microcomputer 15...Rotation detection sensor 16...Rack position sensor 17...Flywheel housing 18...Transmission 19... Clutch actuator 24...Accelerator stroke sensor 26...Clutch rotation detection sensor 27...Clutch stroke sensor 28...Alarm means.

Claims (1)

[Claims] In a device that issues an alarm to notify the time for replacement due to clutch slippage due to wear of the clutch facing, a means for detecting whether slippage has occurred in the clutch, a means for calculating the torque generated by the engine, and a transmittable torque of the clutch. and means for determining whether or not the clutch is intentionally slipping from a comparison between the generated torque of the engine calculated by the two calculation means and the transferable torque of the clutch. 1. A wear warning device for a clutch facing, characterized in that the warning is generated when the clutch is slipping even though the clutch is not intentionally slipping.