JPS60234131A - Car clutch controller - Google Patents

Abstract

PURPOSE:To have smooth and effective operation of clutch engagement by sensing the car start timing from the change in the fuel injection amount into the engine, and thereby performing clutch control. CONSTITUTION:When a command signal is emitted from a control unit to a frictional clutch 4, it is operated at No.1 speed. When the clutch comes in the half clutch zone, the load on the engine increases rapidly, so that the amount of fuel injection to the engine increases quickly. At this time a control rack 7a of the fuel injection pump 7 moves in the direction of fuel increase, and this timing is sensed by a start sensing part 12. This can offer a precise start timing. After this, clutch operation is made very slowly, and smooth operation of clutch engagement is accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vehicle clutch control device for automatically connecting a friction clutch for vehicle width.

Conventional Technology A conventional device for automatically connecting a friction clutch for a vehicle includes, for example, a hydraulic actuator with an electromagnetic valve connected to the friction clutch and configured to automatically connect the friction clutch according to a predetermined program. What has been done is publicly known. Such a device is, for example,
020 and Japanese Patent Application Laid-Open No. 57-160729, here, the engine speed is used as the main variable, and the speed difference between the driven shaft and the drive shaft of the clutch is used as the condition variable.

A configuration has been proposed to control the bond strength. However, immediately after starting, the rotational speed of the clutch driven shaft is extremely low, and it is extremely difficult to detect the rotational speed of the clutch driven shaft due to the above-mentioned control. Therefore, in the proposed configuration, control is not performed until the driven shaft of the clutch has rotated to a certain extent, and due to the response delay in the control circuit and actuator, it is not possible to eliminate the shock of clutch engagement, and smooth starting is not possible. It is difficult to do this. In order to eliminate this problem, a configuration may be considered in which the above-described control is performed slightly before the driven shaft starts to move, but such a configuration causes another problem in that it takes too long to start.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to reliably detect when the clutch enters the half-clutch zone when starting the vehicle;
It is an object of the present invention to provide a clutch control device for a vehicle that enables efficient and smooth engagement of a shift latch.

Structure of the Invention The structure of the present invention relates to a vehicle configured such that a friction clutch provided between a vehicle diesel engine and a transmission is automatically engaged in response to input of a predetermined command signal. In the clutch control device for a diesel engine, a first detection means detects the amount of fuel supplied to the diesel engine, and a first detection means detects the start timing of the vehicle based on the detection result of the first detection means and the command signal. a second detection means, an actuator for operating the friction clutch, and a second detection means, which responds to the command signal and the detection result of the second detection means, and detects the friction during the period from the input of the command signal to the start timing °. The clutch is operated at the first speed, and the friction clutch is operated at the first speed for a predetermined period from the start timing.
The actuator is characterized in that it comprises means for driving and controlling the actuator so that it is operated at a second speed that is slower than the speed of the actuator.

The predetermined period can be selected, for example, when the vehicle speed is approximately 3 to 5 KrQ/h.

According to this i configuration, after the command signal is output, when the friction clutch is operated at the first speed and enters the half-clutch zone, the load on the engine increases rapidly, which causes the engine to This rapid increase in fuel is detected by the second detection means, and the start timing of the vehicle is accurately detected by kneading. Since the actuator slows down the operation speed for engaging the friction clutch based on this start timing, the half-clutch operation can be performed extremely smoothly. As a result, it is possible to significantly improve the feeling when the clutch is engaged, and there are other benefits such as being able to start quickly without wasting time in operating the friction clutch, and extending the life of the clutch. have.

EMBODIMENTS The present invention will be described in detail below with reference to illustrated embodiments. FIG. 1 shows a block diagram of an embodiment of a vehicle clutch control device according to the present invention. A clutch control device 1 connects a friction clutch 4 provided between an internal combustion engine 2, which is a drive source of a vehicle (not shown), and a transmission 3;
It is a device for automatically performing a disengagement operation, and includes an actuator 5 connected to the friction clutch 4 for operating the friction clutch 4, and a control for giving a necessary control signal C8 to the friction clutch 4. It has a unit 6.

A position detector 8 is connected to a control rack 7a of a fuel injection pump 7 for injecting and supplying fuel to the internal combustion engine 2, and a position signal RP indicating the current position of the control rack 7a is transmitted to the position detector. Output from 8.

In the illustrated embodiment, the control rack 7a is a rack rack that operates in response to an injection amount control signal Q output from the injection amount control unit 9 in response to data D indicating the operating conditions of the engine at the time. The position of the engine 2 is electronically controlled so that the engine 2 is operated with all-speed characteristics according to the engine operating conditions at the time. The position signal RP is also input to the injection amount control unit 9 as a position feedback signal.

Since a device for electronically controlling the injection amount of the fuel injection pump 7 with the above-described configuration is well known, a detailed explanation of the control will be omitted.

In order to detect a sudden increase in the load on the internal combustion engine 2 that occurs at the moment of engagement of the friction clutch 4, the control section 6 is provided with a start detection section 12. In order to command disconnection, a command signal ST and a position signal RP are inputted in response to the operation of the illustrated accelerator pedal. The command signal ST is a signal that is at a low level when commanding the disengagement of the friction clutch 4, and at a high level when commanding the engagement of the friction clutch 4.

The start detection unit 12 detects the timing at which the level of the position signal itP changes suddenly after the level of the command signal ST changes from a low level to a high level.

This timing is the timing when the friction clutch 4 enters the half-clutch state and the vehicle starts to start.
At this timing, a start pulse P is output and input to the control signal generator 13.

The control signal generator 13 outputs a control signal C8 for driving and controlling the actuator 5 to connect or disconnect the friction clutch 4, depending on the level of the command signal ST. The control signal C8 is a pulse signal, and the actuator 5 is configured to be able to connect or disconnect the friction clutch 4 at an operating speed according to its duty ratio.

A slip rate detector 15 is provided to detect a fully engaged state of the friction clutch 4. Slip rate detector 1
5, the first speed signal S1 from the first speed sensor 16 attached to the input side of the friction clutch 4 and the friction clutch 4.
A second speed signal S, from a second speed sensor 17 attached to the output side of the
, a slip rate report-M indicating the current slip rate of the friction clutch 4 is outputted and inputted to the control signal generating section 13. Further, reference numeral 18 indicates a stroke sensor connected to the release lever 4a of the friction clutch 4 in order to detect the stroke amount of the friction clutch 4, and the stroke sensor 18 receives a stroke signal S.
TK is input to the control signal generator 13.

The duty ratio of the control signal C8, which is a pulse signal, is the start start pulse Ply, the duty ratio signal M, and the stroke signal ST.
The control is performed in response to a start completion pulse P2 that is output when the vehicle speed sensor 14 connected to the wheel drive unit #111 detects that the vehicle speed has exceeded a predetermined value.

Next, the control of the duty ratio DR of the control signal C8 will be explained with reference to FIG. In FIG. 2, the horizontal axis represents time t, and the vertical axis represents friction clutch 40 stroke iK. Before time t, the command signal ST is at a low level, so the stroke amount of the friction clutch 4 is K. F2 and go, 6, t, =
When the command signal ST becomes high level at ti, the data ratio DR of the control signal C8 becomes 1, and the friction clutch 4
is rapidly manipulated in the direction of connection. When the stroke i-K of the friction clutch 4 becomes 1 (t-tt), the data ratio DR of the control signal C8 becomes A, which is slightly smaller than 1.
The friction clutch 4 is engaged at a relatively slow speed. Thus, the stroke amount of the friction clutch 40 becomes (t=tm >), and when the clutch enters the half-clutch zone, the load on the internal combustion engine 2 increases rapidly, so the position of the control rack 7a rapidly moves in the direction of fuel increase. It turns out.

As already mentioned, this timing is detected as the start timing in the start detecting section 12, and the start start pulse 72 is output, so whether or not the friction clutch 40 stroke amount reaches 1 is determined by the start start pulse P8. can be easily and accurately determined by the occurrence of B, and thereby the duty ratio DR of the control signal C8 is changed to a much smaller value B. Therefore, the engagement speed of the friction clutch 4 is very slow, and a smooth half-clutch operation is performed. In this way, the entry into the half-clutch zone is detected very accurately, so that the shock when the clutch is engaged is also very small.

1=1. , the vehicle speed is set to a predetermined value (for example, 3 to 51 (n+
/h) is detected by the vehicle speed sensor 14 and a start completion pulse P is output.In response, the duty ratio DR of the control signal C8 reaches A again at a much faster speed. The friction clutch 4 is connected.

And 1=1. In stroke 1 to 4 and oak,
When it is detected that the friction clutch 4 has escaped from the half-clutch state by the slip rate M=0, the duty ratio DR of the control signal C8 becomes 1, and the stroke amount is thereafter K. Friction clutch 4 at the fastest speed until N
operations are performed. This completes the connection of the friction clutch 4.

When the command signal ST becomes low level when the friction clutch 4 is in the connected state, the output of the control signal C8 is stopped, the friction clutch 4 is disengaged at the rowing speed, and its stroke amount is K. N to K. F.

I will go back to the beginning.

The above-mentioned control operation in the control signal generating section 13 can be easily realized by causing a microcomputer to execute a required control program.

FIG. 3 shows a float of the control program. After the start of the program, first in step 21 it is determined whether or not the level of the command signal ST has become "H". If the level of the command signal ST is rHJ, the duty ratio DR of the control signal C8 is In step 22), the connection operation of the friction clutch 4 is started. Next, it is determined whether the stroke amount K is less than or equal to (step 23), and if K≦,
Step 2: Set the duty ratio DR of the control signal C8 to A.
4) Wait for the start pulse P1 to be output (step 25). If the start pulse P1 is output and the determination result in step 25 is YES, the control signal C8
The duty ratio DR of is set to B (step 26), and then it is determined whether or not the start completion pulse P is output (
Step 27). When the start completion pulse P is output,
The duty ratio DR of the control signal C8 is set to A (step 28), and in step 29, it is waited for the duty ratio signal M to become O. When it is determined in step 29 that the slip rate is zero, the duty ratio D of the control signal C8 is
When R is set to 1 (step 30) and K-KoN is reached, the operation of the friction clutch 4 is completed.

Effects of the Invention According to the present invention, as described above, it is possible to extremely accurately detect the starting state of a vehicle by focusing on the sudden change in engine load that occurs when the friction clutch enters the half-clutch zone. Therefore, it is possible to slow down the operating speed for engaging the friction clutch and perform a smooth engaging operation of the clutch, which significantly improves the feeling when engaging the clutch compared to conventional devices of this type. In addition, the friction clutch has excellent effects such as efficient operation of the friction clutch, quick start-up, and extended clutch life.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a vehicle clutch control device according to the present invention, FIG. 2 is a graph for explaining the operation of the device shown in FIG. 1, and FIG. 3 is a flowchart of a control program for executing a control operation of a control signal generating section by a microcomputer. 1...Clutch control device, 2...Internal combustion engine, 3...
・Transmission, 4... Friction clutch, 5... Actuator, 6... Control unit, 8... Position detector, 12
...Start detection section, 13...Control signal generation section, RP.
...Position signal, C8...Control signal, ST...Command signal, Pl...Start start pulse, P2...Start completion pulse. Patent applicant: Diesel Kiki Co., Ltd. Representative Patent attorney: Masatoshi Takano

Claims (1)

[Claims] 1. A clutch control device for a vehicle configured such that a friction clutch provided between a vehicle diesel engine and a transmission is automatically engaged in response to input of a predetermined command signal; a first detection means for detecting the amount of fuel supplied to the diesel engine; a second detection means for detecting the start timing of the vehicle based on the detection result of the first detection means and the command signal; and the friction An actuator for operating the clutch, and in response to the command signal and the detection result of the second detection means, the friction clutch is operated at a first speed during the period from input of the command signal to the start timing. and means for driving and controlling the actuator so that the friction clutch is operated at a second speed slower than the first speed for a predetermined period from the start timing. Control device.