JPH07103912B2 - Inching controller for clutch-type automatic transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inching control device for a clutch type automatic transmission, and more particularly to a clutch type automatic transmission equipped with a manual operation type inching device.

[Conventional technology]

A conventional clutch type automatic transmission is disclosed in
As shown in Japanese Patent Laid-Open No. 61-105236, when the inching pedal is depressed, the depression amount is converted into an electric signal, and the clutch engagement amount is controlled based on the signal according to a map stored in a storage device. It was designed to perform inching control.

[Problems to be Solved by the Invention]

When performing an inching operation, it is often required that the vehicle is slightly delicately traveled depending on the load state of the vehicle, the condition of roads and surrounding obstacles, and the like. In such a case, it is often difficult to actually use the driving operation of the vehicle to uniformly determine the clutch engagement amount by the inching pedal based on a preset map.

The present invention has been conceived in view of the above, in which the operation amount of the inching pedal is directly transmitted to the clutch engagement actuator through the fluid without using an electric signal, and the delicate engagement of the clutch is performed when the inching pedal is operated. It is an object of the present invention to provide an inching control device for a clutch type automatic transmission, which can experience a change in the amount and can perform an inching operation that is extremely easy to operate.

[Means for Solving the Problems]

In order to achieve the above object, an inching control device for a clutch type automatic transmission according to the present invention includes a throttle opening control means, an engine having a throttle opening detection means and an engine speed detection means, and forward / reverse switching. A gear switching drive means, a transmission having forward-reverse switching detection means, a shift drive means, and a shift position detection means; and a transmission interposed between the engine and the transmission and connected by an operation drive means, A clutch which is operated to switch between disengagement, an accelerator pedal, an accelerator stroke detector, a forward / reverse switching lever, a forward / reverse switching detecting means, a converting means for converting a signal from each of the detecting means, and the converting means. Arithmetic processing means for arithmetically processing the converted signal based on the data from the storage means, and output means for converting and outputting the signal resulting from the arithmetic processing by the arithmetic processing means. In the clutch type automatic transmission including the clutch and the actuator drive means for supplying power to each actuator of each drive means of the transmission based on the output signal from the output means, in the clutch switching operation part, A clutch actuator for automatic operation driven by the actuator driving means,
A clutch actuator for manual operation driven by depressing the inching pedal is provided in parallel, and a stroke detecting means for detecting a stroke of each clutch actuator and inputting it to the arithmetic processing means is provided. ing.

[Action]

During normal traveling, the clutch is automatically engaged / disengaged by the clutch actuator for automatic operation according to the vehicle speed at this time, and the shift control is automatically performed. When the inching pedal is depressed, the automatic clutch operation is released, and the clutch engagement amount is controlled manually.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is an engine, 2 is a transmission connected to the engine 1 via a clutch 3, and 4 is a drive wheel connected to an output shaft of the transmission 2 via a differential device 5. The clutch 3 is brought into contact and disengaged by rotating a lever 6 with a link 7. One end of the link 7 of the clutch 3 is T-shaped, and the ends of the respective ends of a clutch actuator 8 for manual operation and a clutch actuator 9 for automatic operation, which are arranged parallel to the operating direction of the link 7. It engages with the long hole provided in the section. Both ends of the link 7 and both clutch actuators 8,
As for the relationship of engagement of the elongated slot 9 at the tip, the actuators 8 and 9 are engaged so as to return to the stroke end in the contact state of the clutch 3. 10 and 11 are actuator stroke detectors that detect the strokes S _A and S _M of the clutch actuators 8 and 9, respectively.

Reference numeral 12 denotes an inching pedal for manual operation, and when the pedal is depressed, oil in the cylinder 12a is supplied to the clutch actuator 8 for manual operation. An inching pedal stroke detector 13 detects the stroke of the inching pedal stroke detector.

Reference numeral 14 is a stepping motor that operates the throttle of the engine 1, 15 is a throttle opening detector that detects the throttle opening, 16 is an engine rotation speed detector that detects the rotation speed of the output shaft of the engine 1, and 17 is the transmission 2 A forward / reverse switching actuator for switching between forward and reverse of the vehicle, 18 is a forward / reverse switching detector that detects the stroke of the transmission 2 to detect the forward / backward switching position, and 19 is the first speed stage of the transmission 2. 1st / 2nd speed switching actuator for switching to 2nd speed, 20 is a 1st / 2nd speed switching detector for detecting this, 21 is a vehicle speed detection for converting the speed of the output shaft of the transmission 2 into a vehicle speed and detecting It is a vessel.

Reference numeral 22 is an actuator valve that selectively supplies the pressure oil from the hydraulic pressure source 23. The actuator valve 22 is provided to the clutch actuator 9 for automatic operation, the forward / reverse switching actuator 17, and the first / second speed switching actuator 19. It is connected.

Further, 24 is an accelerator pedal, 25 is an accelerator stroke detector that detects the operation amount of the accelerator pedal, 26 is a forward / reverse switching lever, 26
a is a forward / reverse switching detector, 27 is a 1st / 2nd speed hold switch,
28 is an automatic / manual switch that switches the driving operation between automatic and manual (manual), and normally it is set to the automatic side.

29 is an A / D converter that A / D converts the input signal from each of the above detectors and inputs it to the CPU 30, 31 is a ROM that inputs predetermined storage contents to the CPU 30, 32 is a D / A output from the CPU 30 D / A converted and output to stepping motor 14 and actuator valve 22
It is a converter.

With the above configuration, the accelerator pedal 2 is used during normal driving.
4.By operating the forward / reverse switching lever 26, shift gears can be shifted up / down and forward / reverse gears can be switched in the same manner as conventional general clutch type automatic transmissions, but only inching operation is completely manual operation. Will be performed.

The automatic inching operation and manual switching are performed by the inching switch 28.

Next, the inching operation by this manual operation will be described.

By depressing the inching pedal 12, pressure is generated in the cylinder 12a, whereby the clutch actuator 8 for manual operation is extended and the link 7 is driven, and the clutch 3 is operated in the disengagement direction. The amount of depression of the inching pedal 12 at this time is determined by the stroke detector
It is detected at 13 and transmitted to the CPU 30 via the A / D converter 29.

At this time, the clutch actuator 8 for manual operation
And the operating position of the clutch actuator 9 for automatic operation are detected by the respective actuator stroke detectors 10 and 11 and input to the CPU 30 via the A / D converter 29.

The CPU 30 compares the strokes S _A and S _M of both clutch actuators 9 and 10 at this time, and releases the control of the clutch actuator 9 for automatic operation by the CPU 30 when S _M > S _A. The engagement amount of the clutch 3 is controlled by manually operating the inching pedal 12.

The working distance of both clutch actuators 8 and 9 is S _M <S _A
In the case of, the control of the clutch actuator 9 for automatic operation is performed based on the CPU 30.

That is, the clutch 3 is used because it is the gear engine during normal driving.
When the clutch actuator 9 for automatic operation is controlled by the CPU 30 and the clutch actuator 9 for automatic operation is in operation, the operation amount of the clutch actuator 8 for manual operation by the inching pedal 12 is for automatic operation. The engagement amount of the clutch 3 is controlled by the CPU 30 until the operation amount of the clutch actuator 9 is reached.

That is, while the engagement amount of the clutch 3 controlled by the CPU 30 is larger than the clutch engagement amount controlled by the inching pedal 12, the clutch engagement amount is controlled by the CPU 30.
When the clutch engagement amount by the inching pedal 12 becomes large, the operation by the inching pedal 12 is prioritized thereafter until the inching pedal 12 is turned off.

The CPU 30 determines the above operation by taking out the data from the ROM 31 based on the signals from the detectors 10, 11, 13 and controls the clutch actuator 9 for automatic operation.

Here, inching start and inching control will be described.

The clutch 3 is disengaged in order to prevent engine stalling when the vehicle is stopped when the forward / reverse switching gear is in a state other than neutral, that is, in forward or reverse.

That is, the forward / reverse switching detector 18 detects that the forward / reverse switching gear is in a forward or reverse direction other than neutral, and the vehicle speed detector 21 detects that the vehicle speed is zero, and further from the inching pedal stroke. When it is detected that the inching pedal 12 is not depressed, the CPU 30 receives these detection signals, reads the data from the ROM 31, outputs a clutch disconnection signal to the actuator valve 22, and the actuator valve 22 outputs the clutch for automatic operation. Pressure oil is supplied to the actuator 9. Then, as shown in FIG. 2, the link 7 is operated by the clutch actuator 9 for automatic operation, and the clutch 3 is disengaged.

At this time, the clutch disengagement position is set to the position closest to the contact side within a range in which the clutch 3 does not rotate together.

When the inching pedal 12 is depressed to start inching while the vehicle is stopped, the clutch actuator 8 for manual operation is extended. At this time, the link 7 is as shown in FIG. Therefore, the link 7 does not move and the clutch 3 is not activated. When the inching pedal 12 is depressed to some extent by the above operation, the actuator 8 of the inching pedal 12 contacts the link 7. The amount of depression of the inching pedal 12 at this time is denoted by '.

When the amount of depression of the inching pedal 12 reaches ′, the CP from the detection signal from the inching pedal stroke detector 13
The clutch actuator 9 for automatic operation is returned to the original position via U30 to set S _A = 0, or the relationship is constantly set to S _A = S _M.

If the inching pedal 12 is operated in this state, the clutch 3
The stroke (engagement amount) is as shown in FIG. 3, and is completely controlled by the depression amount of the inching pedal 12.

The inching pedal stroke and the driving force (clutch engagement amount) are as shown in FIG. 5, but the inching pedal stroke corresponds to the clutch stroke in a substantially proportional relationship.

When the gear position of the first speed → the second speed or the second speed → the first speed is changed or the forward and reverse gears are changed during the operation of the inching pedal 12, the clutch actuator 9 for the automatic operation is operated by the CP.
It moves under the control of U30, but at this time, when S _A > S _M , the clutch actuator 9 for automatic operation has priority, and the clutch actuator 9 for automatic operation has priority, as is clear from the link mechanism of the clutch 3. Is operated by.

And in the above operation, both clutch actuators 8,
When the stroke of 9 is S _A <S _M , the clutch actuator 8 for manual operation is operated according to the depression amount of the inching pedal 12 of the clutch 3.

When the inching pedal 12 is released, the forward / reverse switching detector 18 again signals that the forward / reverse gear is moving forward or backward, the vehicle speed detector 21 indicates that the vehicle speed is zero, and the inching pedal stroke detector 18 Upon receipt of a signal from 13 that the inching pedal 12 is not depressed, the CPU actuator controls the clutch actuator 9 for automatic operation to move the clutch 3 to the position.

The above operation is shown in a Lofeau chart as shown in FIG.

In FIG. 4, N = 0 indicates that the clutch stroke has not reached, and N = 1 indicates that the clutch stroke has passed.

The above description is for the 1st / 2nd speed hold switch shown in FIG.
Although the operations of the 27 and the inching changeover switch 28 are ignored, the CPU 30 receives this signal when the 1st / 2nd speed hold switch 27 is turned on during traveling at the 1st speed, and the actuator valve 22 receives a gear hold command. And the vehicle speed went up to 1
Even if the conditions for shifting up from the second speed to the second speed are satisfied, the gear shift up is not performed.

Also, when the second speed hold switch is turned on during first speed running,
CPU30 is the 1st / 2nd speed switching detector 20
It detects that it is in high speed, and suspends the output of the second speed hold signal. Then, as the vehicle speed increases, the shift up from the 1st speed to the 2nd speed is automatically performed, and the 1st speed / 2nd speed switching detector 20 to 2
When it is detected that the high speed gear is engaged, the second speed hold command is output in the same manner as above.

When the automatic / manual switch 28 is switched to manual, CP
The U30 stops all operations and displays on the display that it has been switched to a means such as a lamp.

As a result, for example, when the vehicle continues to decelerate while the vehicle is traveling with the accelerator depressed constantly, the engine can be manually downshifted to prevent engine stalling.

The operation of the present invention is summarized as follows.

When the vehicle speed increases by depressing the accelerator pedal 24 during normal traveling, as in the conventional clutch type automatic transmission, the operation of clutch disengagement → shifting gear shift up → clutch engagement is automatically performed. Further, when the vehicle speed decreases by reducing the depression amount of the accelerator pedal 24, the clutch disengagement → shift gear shift down → clutch engagement is automatically performed. Further, when the forward / reverse switching lever 26 is switched, clutch disengagement → forward / reverse switching gear shift → clutch engagement is automatically performed.

When the inching pedal 12 is depressed, the automatic operation of the clutch 3 is released, and the clutch engagement amount control is completely manual. That is, the clutch engagement amount corresponding to the depression amount of the inching pedal 12 by the manual can be obtained.

If the inching pedal 12 is stepped on while the clutch 3 is automatically controlled, the manual operation or the automatic operation, whichever is closer to the clutch disengagement, is prioritized.

Also, when the inching pedal 12 is depressed after switching the transmission gear or after switching the forward / reverse switching gear,
It automatically returns to the position of the clutch engagement amount corresponding to the amount of depression of the inching pedal, and thereafter the manual operation is performed until the inching pedal is turned off.

Further, the variable speed hold means fixes the speed stage with a signal issued based on a manual operation.

Further, since means for switching between automatic and manual is provided, it is possible to freely select automatic or manual by a signal issued based on a manual operation.

〔The invention's effect〕

According to the present invention, the amount of operation of the inching pedal is transmitted to the actuator for clutch engagement directly via fluid without relying on an electric signal, and a subtle change in the amount of engagement of the clutch can be experienced when operating the inching pedal, It is possible to perform an inching operation that is extremely easy to operate.

[Brief description of drawings]

The drawings show the embodiments of the present invention. FIG. 1 is a system configuration diagram showing the overall configuration, FIGS. 2 and 3 are explanatory views of the action of the main parts, and FIG. 4 is a flow chart showing the action of the present invention. Fifth
The figure is a diagram showing the relationship between the stroke of the inching pedal and the clutch and the driving force. 1 is an engine, 2 is a transmission, 3 is a clutch, 8 is a clutch actuator for manual operation, 9 is a clutch actuator for automatic operation, 10 and 11 are actuator stroke detectors, 12 is an inching pedal, 14 is a stepping motor, Reference numeral 15 is a throttle opening detector, 16 is an engine speed detector, 17 is a forward / reverse switching actuator, 18 is a forward / reverse switching detector, 19 is a first speed / second speed switching actuator, 20 is a first speed / second speed switching detection. 22 is an actuator valve, 24 is an accelerator pedal, 25 is an accelerator stroke detector, 26 is a forward / reverse switching lever, 26a is a forward / reverse switching detector, 29 is an A / D converter, 30 is a CPU, 31 is a ROM, 32 is a D / A converter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shiro Iwata 110 Komatsu Nitta, Oyama City, Tochigi Prefecture Komatsu Forklift Co., Ltd.Tochigi Plant (72) Inventor Tsuneo Ogawa 110 Yokokura Nitta, Oyama City, Tochigi Prefecture Komatsu Fork Lift Co., Ltd. Tochigi factory

Claims (1)

[Claims] Claim: What is claimed is: 1. An engine having throttle opening control means, throttle opening detection means and engine speed detection means, forward / reverse switching gear switching drive means, forward / backward switching detection means, speed change drive means, and speed change. A transmission having a position detection means, a clutch interposed between the engine and the transmission, and operated to switch between contact and disconnection by an operation drive means,
An accelerator pedal, an accelerator stroke detector, a forward / reverse switching lever, a forward / reverse switching detecting means, a converting means for converting a signal from each of the detecting means, and a signal converted by the converting means from a storage means. Arithmetic processing means for performing arithmetic processing based on the data of the above, output means for converting and outputting the signal of the result of the arithmetic processing by this arithmetic processing means, and the clutch and gear shift based on the output signal from this output means. In a clutch type automatic transmission provided with an actuator drive means for supplying power to each actuator of each drive means of the machine, a clutch for automatic operation driven by the actuator drive means in a clutch switching operation part. Actuator and clutch actuator for manual operation driven by depressing the inching pedal are arranged in parallel. Together to provide, inching control device detects the stroke of each of the clutch actuator clutch automatic transmission characterized by comprising providing a stroke detecting means for inputting to the processing means.