JPH0578450B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention allows an operation switch for performing a power extraction operation to be placed at a working position other than the driver's seat, and allows the power extraction operation to be performed even from the working position. The present invention relates to an engine power extraction device for a vehicle, which is capable of performing a power extraction operation and also allows the vehicle to run at a slow speed during power extraction.

[Conventional technology]

In a vehicle equipped with a special device driven by mechanical power, the power for driving the special device is generally extracted from the engine for driving the vehicle. In this case, it is necessary to switch the power transmission system from the driving system to the special device drive system, and this switching operation is usually performed while the vehicle is stopped.

The switching operation that transmits engine power to such a special device involves connecting and disconnecting the power take-off shaft installed in the transmission to the drive shaft (countershaft) of the transmission in conjunction with the timing of engagement and disconnection of the clutch. This is done by a power take-off device.

It is known that the power take-off device can be controlled using a manual mechanical structure using links or levers, or a semi-automatic electric circuit structure using switches, relays, solenoid valves, etc.

Manual mechanical configurations require the clutch to be disengaged (depressing the clutch pedal) each time the power take-off shaft is connected and disconnected, and if the power take-off device is frequently turned on and off, , the clutch operation was extremely troublesome.
Therefore, a semi-automatic method has been proposed that eliminates this complexity by electrically controlling the connection and disconnection of the clutch by turning on and off the switch that operates the power take-off device (hereinafter referred to as the "PTO switch"). Publication number 60-111720).

This technology automatically engages and disengages the clutch and engages or disengages the power take-off shaft with a single touch operation of the PTO switch. In other words, for example, to operate the power take-off device, turn on the PTO switch while the vehicle is stopped.
This method extracts power from the engine by disengaging the clutch, engaging the power extraction shaft of the power extraction device with the countershaft of the transmission, and then engaging the clutch again.

However, this prior art is based on the premise that in a vehicle equipped with an automatic transmission and an automatic clutch, the clutch is engaged and disconnected by an actuator controlled by a computer.

Therefore, in a vehicle equipped with a manually operated transmission and clutch, the clutch is connected and disconnected by the clutch pedal, and in this case, the above-mentioned prior art sufficiently discloses a solution to this problem. It has not been.

Therefore, the applicant of the present application has filed a patent application (Japanese Patent Application No. 61-209055 (see Japanese Patent Application Laid-Open No. 63-64820)) to develop a vehicle equipped with a manual transmission and a clutch, that is, to connect and disconnect the clutch. In a vehicle which is equipped with a first hydraulic system controlled by a clutch pedal and a second hydraulic system controlled by a control circuit, and which controls the engagement and disengagement of the clutch by switching between these two hydraulic systems, the operation of the power extraction device is Accordingly, a method for programmatic control of clutch engagement and disengagement was presented.

That is, in the above application, when the transmission is in neutral and the clutch pedal is in the open state (clutch engaged), the PTO switch is turned on and the power take-off shaft is engaged, and the power take-off shaft is engaged. In addition to turning off the PTO switch, when the clutch pedal is pressed, the power take-off shaft is immediately disengaged.
As a result, the clutch pedal and the actuator can be used to control the engagement and disengagement of the clutch at the same time, and by giving priority to the operation of the clutch pedal, the operation of the power extraction device can be controlled safely and reliably.

For the safety of workers and work equipment, power take-off devices are generally operated while the vehicle is stopped. In this kind of usage,
In order to enable the power take-off device to be operated with one-touch operation using a PTO switch, various control conditions as shown in the above-mentioned earlier application are provided to ensure safe and reliable operation.

[Problem that the invention seeks to solve]

However, for example, when it is desired to shake the vehicle a little in order to discharge waste from cargo, it may be convenient to operate the power extraction device even when the vehicle is traveling at low speeds forward or backwards.

The present invention has been made in view of these problems, and in a vehicle equipped with a manually operated transmission and clutch, it is possible to control the engagement and disengagement of the clutch by operating the clutch pedal, and to control the engagement and disengagement of the clutch during the power extraction process. Clarify the relationship with disconnection control,
To provide a power take-off device for a vehicle that can easily, safely and reliably operate the power take-off device even when installed at a working position other than a driver's seat, and further allows the vehicle to run at a slow speed while taking out the power. The purpose is to

[Means for solving problems]

The first aspect of the present invention is to provide a transmission with an auxiliary power take-off shaft, a means for connecting and disconnecting the power take-off shaft to a drive shaft of the transmission, a means for connecting and disconnecting a clutch on the input side of the transmission, Operation switch (PTO switch)
and a control circuit for programmatically controlling the two connecting/disconnecting means according to input from the vehicle, wherein the control circuit sets the transmission to a running position other than first gear or reverse. The invention is characterized in that it includes means for instructing disconnection of the power take-off shaft and the drive shaft when the power output shaft is disconnected from the drive shaft.

In addition to the configuration of the first invention, a second invention of the present invention includes means for detecting the amount of depression of an accelerator pedal for a driving driver's seat, and the control circuit is configured to detect when the accelerator pedal is depressed to a predetermined value or more. The present invention is characterized in that it includes means for instructing disconnection of the power take-off shaft and the drive shaft in the disconnected state.

[Effect]

In the present invention, when the PTO switch is turned on and the power take-off device is operated, the transmission is set in the neutral position and the clutch pedal is released, and then the clutch is disengaged and the power take-off shaft is turned on. Control is automatically performed to connect the clutch to the drive shaft of the transmission and reapply the clutch. This allows the power take-off device to be operated by one-touch operation of the PTO switch.

When the operation setting of the power extraction device is completed or during its operation, the transmission can be set to first speed or reverse, and at this time, the vehicle can be driven at a slow speed along with the power extraction operation.

Also, when the PTO switch is turned off,
Control is automatically performed to temporarily disconnect the clutch, disconnect the power take-off shaft and the drive shaft of the transmission, and then reconnect the clutch. Furthermore, when the transmission is set to a mode other than first or reverse, when the amount of accelerator pedal depression exceeds a predetermined value, or when the PTO switch is turned off while the accelerator pedal is depressed, automatic and The operation of the power take-off device is forcibly stopped.

As a result, even if the PTO switch is installed in a position other than the driver's seat, the engine power take-off device can be operated or stopped safely and reliably.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, reference number 10 is a clutch (CL), reference number 20 is a transmission (TM),
Reference number 30 is the power take-off (PTO), reference number 4
0 is the clutch pedal.

The clutch 10 is connected and disconnected by a clutch cylinder 52 operated by hydraulic pressure supplied through a pressure amplification device 51.

The power take-off section 30 is configured to take out engine power by connecting a power take-off shaft 31 to the clutch output shaft 22 via the countershaft 21 of the transmission 20, and its connection control is connected to the vacuum tank 61. This is done via the PTO disconnection solenoid valve 62.

The microprocessor 71 is the input/output control device 7
A plurality of PTO switches 81, 82 and a PTO disconnection solenoid valve 62 are connected through the PTO switch 2. PTO
The switches include, for example, a PTO switch 81 located at the driver's seat and a PTO switch 82 located at the working position.

As means for connecting and disconnecting the clutch 10, a first hydraulic system controlled by the clutch pedal 40 and a second hydraulic system controlled by the microprocessor 71 are provided, and these two hydraulic systems are switched to control the pressure structure. This is a configuration for supplying to the device 51. That is, the first hydraulic system is a system that supplies the output hydraulic pressure of the master cylinder 53, which is linked to the operation of the clutch pedal 40, to the pressure multiplier 51 via the switching valve 54. The second hydraulic system transfers the output hydraulic pressure of the actuator 55 to the pressure multiplier 51 via the switching valve 54.
This is the system that supplies the

The drive control of the actuator 55 is performed by a clutch disconnection solenoid valve 63 connected to a vacuum tank 61.
It is done through.

Furthermore, the microprocessor 71 is provided with a clutch sensor 13, a transmission setting state detection sensor 23, a PTO sensor 33,
A clutch switch 43, an accelerator sensor 45, and a clutch disconnection solenoid valve 63 are connected. The clutch switch 43 is configured to be turned on when the clutch pedal 40 is depressed and turned off when it is in the open state. In addition, the accelerator sensor 45
is configured to send out an output value according to the amount of depression of the accelerator pedal 46.

With such a configuration, the device of the present invention has the following features:
By one-touch operation of the PTO switch 81 or 82, the power take-off section 30 can be operated safely, reliably, and automatically, and furthermore, the device can be made to run at a slow speed while the power is being taken off.

Below, we will explain the series of steps at this time in the second section.
This will be explained with reference to FIGS. 3 and 4.

FIG. 2 is a flowchart illustrating the procedure for operating the power take-off section 30.

Figures 3 and 4 are control flowcharts for forcibly disconnecting the power take-off shaft;
FIG. 3 shows an embodiment of the first invention, and FIG.
The figure shows an embodiment of the second invention.

When the PTO switch 81 or 82 is turned on, the clutch switch 43 detects whether the clutch pedal 40 is in the open state, and the transmission setting state detection sensor 23 detects whether the transmission 20 is in the neutral state. To detect.

When the clutch pedal 40 is not in the open state, that is, when the vehicle is running or stopped and a gear change operation is in progress, or when the vehicle is stopped due to the clutch being disengaged, the PTO switches 81 and 82 are activated.
Disable on. Furthermore, when the transmission 20 is not in a neutral state, that is, when the vehicle is running or when the transmission 20 is shifted in an attempt to run, the PTO switches 81 and 82 are also disabled.

Therefore, the PTO switch 8 is activated only when the clutch pedal 40 is in the open state (clutch engaged) and the transmission 20 is in the neutral state.
1 and 82, and turn on the clutch connection/disconnection solenoid valve 63. When the clutch connection/disconnection electromagnetic valve 63 is turned on, the actuator 55 is actuated, which sends hydraulic pressure to the pressure multiplier 51 via the switching valve 54 to actuate the clutch cylinder 52 and disengage the clutch 10.

After confirming the disengagement of the clutch 10 using the clutch sensor 13, by turning on the PTO disconnection solenoid valve 62, the power take-off shaft 31 is connected to the clutch output shaft 22 via the countershaft 21, and the PTO sensor 33 is connected to the clutch output shaft 22 via the countershaft 21. This is confirmed by Once this is confirmed, the clutch engagement/disconnection solenoid valve 63 is turned off, and the actuator 55 is operated to gradually bring the clutch 10 into the engagement state.

The clutch sensor 13 confirms that the clutch 10 is engaged and the power extraction operation is started.

At this time, the first hydraulic system controlled by the clutch pedal 40 and the second hydraulic system controlled by the actuator 55 are both in a standby state with low hydraulic pressure, and either of them supplies hydraulic pressure to disengage the clutch 10. I am in a position to do so.

Here, only when the clutch pedal 40 is depressed and the transmission is operated and set to the first gear or reverse position due to the action of the first invention, the vehicle can be driven while performing the power extraction operation. .

Additionally, if the transmission is operated and set to a traveling position other than first gear or reverse position, that is, to a position higher than second gear, the power extraction operation may be stopped to enable normal driving. can.

FIG. 3 is a flowchart illustrating a procedure for stopping the vehicle traveling during power extraction and stopping the power extraction section 30.

The microprocessor 71 monitors the accelerator sensor 45, PTO switches 81, 82, and clutch sensor 13 while the power take-off section 30 is in operation.

Normal power extraction operation is performed while the vehicle is stopped.
When the PTO switches 81 and 82 are in the on state and the clutch pedal 40 is in the open state, the power extraction operation continues.

When the PTO switches 81 and 82 are turned off in this state (the amount of depression of the accelerator pedal 46
is 0), the clutch engagement/disconnection solenoid valve 63 is turned on and the actuator 55 is actuated to close the clutch 10.
to refuse. When the clutch sensor 13 detects that the clutch 10 is disconnected by turning off the PTO switches 81 and 82, it turns off the PTO disconnection solenoid valve 62.

As a result, the power take-off shaft 31 is separated from the countershaft 21. When the PTO sensor 33 confirms this, the clutch 10 is disconnected from the PTO.
When the switches 81 and 82 are turned off, the clutch disconnection solenoid valve 63 is turned off and the clutch 10 is turned off.
This makes it possible to control the clutch by the first hydraulic system by operating the clutch pedal 40.

When the clutch pedal 40 is depressed during power take-off operation and the clutch 10 is disengaged, and the transmission 20 is set to first gear or reverse, the countershaft 21 remains connected to the power take-off shaft 31 and the transmission is turned off. The drive input is also connected to a set transmission gear. As a result, the clutch pedal 40
By bringing the clutch 10 into the engaged state while releasing the depression, the vehicle can be driven while performing the power extraction operation.

Further, when the transmission 20 is set to a position other than first speed or reverse, the PTO disconnection solenoid valve 62 is immediately turned off, the meshing between the countershaft 21 and the power take-off shaft 31 is released, and the countershaft 21 is Connect to the set transmission gear. This allows normal driving.

Next, an embodiment of the second invention will be described. In the second invention, as described in the above embodiment, when the vehicle is run at a slow speed while operating the power extraction device, there is no risk of the running speed becoming excessive. In other words, the amount of depression (w) of the accelerator pedal 46 during the power extraction operation
A circuit is provided to detect this, and even when the amount of depression exceeds a predetermined value (w≧w ₁ ), the PTO disconnection solenoid valve 62 is turned off and the power take-off shaft 31 is forcibly turned off.
can be separated from the count shaft 21.

While the power take-off device is in operation, it is convenient for the rotational speed of the engine to be controlled by a system separate from the accelerator pedal for driving. Therefore,
Here, the accelerator pedal for detecting the amount of depression is an accelerator pedal for driving.

While the accelerator pedal 46 is being depressed (w≠0)
When the PTO switches 81 and 82 are turned off, the PTO disconnection solenoid valve 62 is also turned off to forcibly disconnect the power take-off shaft 31 from the countershaft 21.

In this way, when the transmission 20 is set to a position other than first or reverse while the power take-off unit 30 is operating, when the amount of depression of the accelerator pedal 46 exceeds a predetermined value, or when the accelerator pedal 46
When the PTO switches 81 and 82 are turned off while the pedal 6 is being depressed, their operation is automatically and forcibly stopped. This prevents the running speed of the vehicle from becoming dangerously high while the power take-off device is in operation, or the rotational speed of the power take-off shaft increasing, thereby preventing hydraulic pump failure or gear failure.

With the above configuration, PTO switches 81 and 82
The power extraction device can be operated with a single touch operation, and the power extraction device can be operated safely while the vehicle is running only when the transmission 20 is set to first gear or reverse.

〔Effect of the invention〕

As described above, the present invention allows the engine power take-off device to be operated by a one-touch operation even in places other than the driver's seat, and furthermore, it is possible to operate the power take-off device while the vehicle is running at a slow speed. Furthermore, according to the second invention, safety is improved when the power extraction device is operated while the vehicle is running.

Further, since the operating conditions and stop conditions of the engine power extraction device are set to give priority to the driver's intention, the engine power extraction device can be operated safely and reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart explaining the operation of the embodiment of the present invention. FIG. 3 is a flowchart for explaining the operation of the first embodiment of the present invention. FIG. 4 is a flowchart explaining the operation of the embodiment of the second invention. 10...Clutch (CL), 13...Clutch sensor, 20...Transmission (TM), 21...Counter shaft, 22...Clutch output shaft, 23...
Transmission setting state detection sensor, 30... Power take-off part (PTO), 31... Power take-off shaft, 33... PTO sensor, 40... Clutch pedal, 43... Clutch switch, 45... Accelerator sensor, 46... …
Accelerator pedal, 51...Pressure multiplier, 52...
...Clutch cylinder, 53...Master cylinder,
54...Switching valve, 55...Actuator, 61
... Vacuum tank, 62 ... PTO disconnection solenoid valve, 63 ... Clutch disconnection solenoid valve, 71 ...
Microprocessor, 72... input/output control device,
81, 82...PTO switch.

Claims (1)

[Scope of Claims] 1. A transmission is provided with an auxiliary power take-off shaft, a means for connecting and disconnecting the power take-off shaft to a drive shaft of the transmission, a means for connecting and disconnecting a clutch on the input side of the transmission, and an operation. In a vehicle engine power extraction device comprising a control circuit that programmatically controls the above two connecting/disconnecting means according to input from a switch, the control circuit sets the transmission to a running position other than first gear or reverse. When it is done,
An engine power extraction device for a vehicle, comprising means for commanding disconnection of the power extraction shaft and the drive shaft. 2. The transmission is equipped with an auxiliary power take-off shaft, a means for connecting and disconnecting the power take-off shaft to the drive shaft of the transmission, a means for connecting and disconnecting a clutch on the input side of the transmission, and a means for connecting and disconnecting the clutch on the input side of the transmission, and the above-mentioned method according to the input from the operation switch. and a control circuit for programmatically controlling the two connecting/disconnecting means, and the control circuit controls when the transmission is set to a traveling position other than first gear or reverse.
The engine power extraction device for a vehicle includes means for commanding disconnection of the power extraction shaft and the drive shaft, and the control circuit includes means for detecting the amount of depression of an accelerator pedal for driving. An engine power extraction device for a vehicle, comprising means for commanding disconnection of the power extraction shaft and the drive shaft when the pedal is depressed beyond a predetermined value.