JPS6092931A - Maintenance-timing alarming apparatus for clutch - Google Patents

Abstract

PURPOSE:To alarm maintenance time by judging the ratio between the variation rates of the number of revolution on the output side of a clutch and the variation rate of the number of revolution of an engine in acceleration and correctly detecting the slip of the clutch. CONSTITUTION:The number of revolution of an engine 1 is detected by a sensor 14, and the number of revolution on the output side of a transmission 5 is detected by a sensor 15, and a each detection output is fed into a microcomputer 7. The CPU10 of the microcomputer 7 reads several times the detection output of the sensor 15 through an input port 21 when a clutch swtich 19 is ON, and calculates the variation rate of car speed. When the car is in acceleration state, in other words when the variation rate is positive, the CPU10 further reads several times the detection output of the sensor 14 through the input port 21, and calculates the variation rate of the number of revolution of the engine 1. When the ratio between the both variation rates is larger than a prescribed value, an alarm display apparatus 8 is operated through an output port 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile clutch maintenance time warning device, and more particularly to a warning device that issues a maintenance time warning when clutch slippage exceeds a predetermined value.

Automobiles are equipped with clutches that intermittent the transmission of power from the engine to the drive system when starting, stopping, or changing gears. Generally, a clutch is installed at the gate between the engine's flywheel and the transmission, and the lining attached to the clutch disc is pressed onto or released from the flywheel to control torque transmission. There is.

If the latch lining is new, it has a high coefficient of friction, so the clutch will not slip.
Torque can be sufficiently transmitted. However, if the clutch is used for a long period of time, or if the clutch is used during rough driving, the lining will wear out and its coefficient of friction will decrease. The clutch then becomes unable to adequately transmit torque from the engine to the transmission. That is, when the clutch lining wears out and the friction coefficient decreases, the torque capacity of the clutch decreases. If the clutch is no longer able to transmit sufficient torque, the running of the vehicle will be hindered.

Conventionally, therefore, clutch maintenance was performed periodically and the lining was replaced after a certain period of time or after driving a certain distance. However, even after driving a certain distance, there is no need to use it! 1, the state of wear of the clutch lining differs from vehicle to vehicle, and appropriate maintenance has not always been carried out. Another conventional method for detecting clutch slippage is to use the driver's intuition to intuitively read changes in medium speed when the vehicle is suddenly started, and use this to detect whether or not there is clutch slippage. I was trying to confirm. However, since the h-method relies on human sensation, it has the disadvantage that it cannot necessarily accurately confirm whether or not there is slippage in the clutch.

The present invention has been made in view of these problems, and provides a clutch that accurately detects when the clutch G slip exceeds a predetermined value and issues an alarm using an alarm means. The object of the present invention is to provide a maintenance time warning device.

The present invention will be explained below with reference to an illustrated embodiment.

FIG. 1 shows an engine 1 for an automobile equipped with a clutch maintenance timing warning device according to an embodiment of the present invention, and the engine 1 is comprised of, for example, a diesel engine. A flywheel housing 2 is disposed on the rear side of the cylinder block of the engine 1, and a flywheel 3 is housed within the housing 2. Note that the flywheel 3 is fixed to the end of the crankshaft of the engine 1.

A clutch disc 4 is further housed within the housing 2 so as to face the flywheel 3.

This clutch disc 4 is designed to be able to slide on the main shaft, and as a result, the clutch lining attached to the outer circumferential side of the clutch disc 4 comes into contact with and separates from the flywheel 3.
Torque transmission is interrupted and interrupted. A transmission 5 is mounted on the rear side of the flywheel housing 2 with the mounting number J3. This transmission 5 changes the rotation speed of the engine 1 to an appropriate speed (1) and transmits it to the drive wheels via the propeller shaft 6. It looks like this.

Next, a device for detecting clutch slippage installed in the flywheel housing 2 will be explained. This device is composed of a microcomputer 7, which includes an alarm display device 8 and a printer 9. are connected to each other. As shown in FIG. 2, the microcomputer 7 has a CPU 10 and a ROM.
11 and a RAM 12. It is also connected to an alarm display device 8 iJ3 and a printer 9 via a CI) tJ10ti output boat 13.

On the other hand, the input side of the CPU 10 includes a rotation detection sensor 14, a vehicle speed sensor 15, a load sensor 16, and a fuel gauge 17.
, a brake switch 18, a clutch switch 19, and an accelerator switch 20 are connected to each other via a capo 1-21.

In the above configuration, when the engine 1 is driven, its output power is transmitted to the flywheel 3 via the crankshaft. When the end surface of the flywheel 3 and the clutch disc 4 are in contact with each other, torque is transmitted to the main shaft of the transmission 5. The transmission 5 changes the rotation speed of the engine 1 to a predetermined value, and transmits the speed to the drive wheels via the propeller shaft 6. The rotation speed of the engine 1 is detected by a rotation detection sensor 14, and the rotation speed of the output side of the transmission 5 is detected by a vehicle speed sensor 15. The outputs of these two sensors 14 and 15 are supplied to the microcomputer 7, respectively.

Next, the warning operation of the clutch maintenance time by the microcomputer 7 will be explained. This warning operation is based on the flowchart v-1 shown in FIG.
1j is controlled by the microcomputer 7. The CP 010 of the microcomputer 7 is
First, the output of the clutch switch 19 is read through the input horn boat 21.

When the clutch switch 19 is turned on, the detection output of the vehicle speed sensor 15 is read through the human capo-l-21. This vehicle speed reading operation is performed at least twice, and the rate of change in vehicle speed S can be determined based on the time between them.
Do 1 calculation. Then, it is determined whether this rate of change is positive or negative. If the rate of change is positive, it means that the vehicle is being accelerated, and in this case, the value of the rate of change is temporarily stored in RAM.
Hold at 12. On the other hand, when the rate of change is negative, it means that the vehicle is being decelerated, and in this case, the rate of change is not maintained.

When the vehicle is accelerating, when the rate of change is 1, that is, when the rate of change is positive, the CPU 10 of the microcomputer 7
reads the detection output of the rotation detection sensor 14 through the input boat 21. That is, information for controlling the rotational speed of the engine 1 is input to the CPU10. This reading is also performed at least twice, and the CPU 1o calculates the rate of change in the rotational speed of the engine 1 based on the time between these readings. Then, this value is temporarily held in the RAM 12 and d3<.

Next, the CPU 10 reads out the result of calculating the rate of change in the vehicle speed stored in the RAM 12 and the result of calculating the rate of change in the rotational speed of the engine 1, and divides the two. By dividing the rate of change in engine speed by the rate of change in vehicle speed, we get 7 degrees, and the ratio of the two rates of change is K.
I put it on. Then, it is determined whether the value of K is larger than a predetermined value α. If it is determined that K is greater than α, the CPU 10 generates an alarm signal.

This alarm signal is supplied to the alarm display device 8 through the output port 13. An alarm display device 8 (for example, installed on the instrument panel of the driver's seat) displays a red alarm.

This therefore makes it possible to inform the driver that the clutch slip exceeds a predetermined value.

Note that the microcomputer 7 and printer 9 are
It constitutes the operation control device of this automobile, and the brick 14
~20 The value detected by the microcomputer 7
By performing arithmetic processing, various data such as fuel efficiency under various conditions, the number of revolutions of one engine, or the relationship between the shift position of the transmission 5 and the number of engine revolutions are obtained. These data are printed out by a printer 9. Furthermore, the value of I to the ratio of the rate of change of the engine 1 to the rate of change of the rotational speed on the output side of the transmission 5 is similarly printed out by the printer 9.

Therefore, from the value of K output by this printer 9, it is possible to know the degree of clutch slippage.

As described above, according to the automobile according to the present embodiment, the rate of change in the rotational speed of the engine 1 and the rate of change in the vehicle speed during acceleration are determined by using the microcomplex l-2 7 constituting the operation control device. If this value exceeds a predetermined value, an alarm signal is generated and an alarm is displayed on the alarm display device W8. It is possible to detect whether the predetermined value is exceeded, and to notify the driver reliably if the predetermined value is exceeded. Therefore, this makes it possible to perform clutch maintenance reliably. Therefore, it is not only possible to perform clutch maintenance when necessary, but also to omit clutch maintenance when unnecessary, thereby saving unnecessary man-hours and reducing costs. Become.

Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, the microcomputer 7 constituting the operation control device is used as the calculation means for detecting the maintenance time of the clutch.
The microcomputer 7 for warning of the clutch maintenance period does not necessarily have to be used as the microcomputer of the operation control device, and may be provided independently from each other, or the operation control device may be omitted. Further, in the above embodiment, the rotation speed on the output horn side of the clutch is obtained by the vehicle speed sensor 15 provided in the transmission 5, but a sensor is provided separately from the vehicle speed sensor 15, and this sensor is used to obtain the output of the clutch. It is also possible to increase the number of rotations on the side.

As described above, the present invention includes means for calculating the rate of change in the rotational speed of the engine during acceleration, means for calculating the rate of change in the rotational speed on the output side of the clutch during acceleration, and the above-described methods. means for determining whether the ratio of the rate of change in engine speed to the rate of change in rotational speed on the output side of the clutch exceeds a predetermined ratio; The present invention relates to a clutch maintenance time alarm device in which an alarm is issued by an alarm means when it is determined that a clutch maintenance period is present. Therefore, according to the present invention, it is possible to accurately detect the degree of clutch slippage, and if the slippage ratio exceeds a predetermined value, an alarm is issued by the alarm means to alert the driver or manager. You can let them know about this. Therefore, not only can clutch maintenance be performed at the correct time, but unnecessary clutch maintenance can be omitted, reducing maintenance man-hours and reducing costs. Become.

[Brief explanation of the drawing]

FIG. 1 is a side view of an engine equipped with a clutch maintenance time warning device according to an embodiment of the present invention, FIG. 2 is a block diagram showing this maintenance time warning device, and FIG. 3 is an operation of the maintenance time warning device. 70-
This is the team. In addition, in the symbols used in the drawings, 1...Middle engine 3...Flywheel 4...Clutch disc 7...Microcomputer 8...Alarm display device 14...Rotation detection sensor 15...Vehicle speed It is a sensor. Applicant Hino Motors Co., Ltd.

Claims (1)

[Claims] In a device that issues a warning that it is time for maintenance when clutch slippage exceeds a predetermined value,
means for calculating the rate of change in the rotational speed of the engine during acceleration; means for calculating the rate of change in the rotational speed on the output side of the clutch during acceleration; and means for calculating the rate of change in the rotational speed on the output side of the clutch; means for determining whether the ratio of the rate of change of the rotational speed exceeds a predetermined value; A clutch maintenance time warning device that is characterized by being made to emit a warning signal.