JPH0643168B2 - Vehicle power extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention allows an operation switch for performing power take-out operation to be arranged at a work position other than the driver's seat, and the power take-out operation can be performed even from the work position. The present invention relates to a vehicle engine power takeoff device that can be carried out and can ensure the safety of a device driven by the power takeoff device.

[Conventional technology]

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

The switching operation for transmitting the power of the engine to such a special device is controlled by connecting / disconnecting the drive shaft (counter shaft) of the transmission with the power take-off shaft provided in the transmission in conjunction with the timing of connection / disconnection of the clutch. It is performed by the engine power take-off device.

The control of this engine power take-off device is known to have a manual mechanical structure using a link or a lever, or a semi-automatic electric circuit structure using a switch, a relay, a solenoid valve or the like.

The manual mechanical structure requires an operation to temporarily disengage the clutch (depress the clutch pedal) for each connection / disconnection control of the power take-off shaft, and when the engine power take-off device is frequently turned on / off. The operation of the clutch was very troublesome. Therefore, a semi-automatic system has been proposed in which a switch for operating the engine power take-off device (hereinafter referred to as "PTO switch") is turned on / off to electrically control the engagement / disengagement of the clutch, thereby eliminating the complexity. Sho 60-111720 gazette).

In this prior art, one-touch operation of a PTO switch automatically engages and disengages a clutch and engages or disengages a power takeoff shaft. However, this prior art is premised on a vehicle equipped with an automatic transmission and an automatic clutch.

Therefore, regarding a vehicle equipped with a manually operated transmission and a clutch, that is, a vehicle in which the clutch pedal is also engaged and disengaged, the applicant of the present application filed a patent application (Japanese Patent Application No. 61-209055) to engage the clutch. An engine power take-off device for a vehicle, which includes a first hydraulic system controlled by a clutch pedal and a second hydraulic system controlled by a control circuit as means for disconnecting the clutch, and controls engagement and disengagement of the clutch by switching between these two hydraulic systems. showed that.

That is, in the above application, the transmission is neutral,
Also, when the clutch pedal is in the released state (clutch contact), the PTO switch is turned on to engage the power take-off shaft, and the PTO switch is operated during operation of the engine power take-off device.
Even when the clutch pedal is depressed other than the switch being turned off, the control for immediately releasing the meshing of the power take-off shaft is performed. As a result, the clutch connection / disconnection control by the clutch pedal and the actuator can be made compatible, and the operation of the engine power take-off device can be controlled safely and reliably by prioritizing the operation of the clutch pedal.

Further, the applicant of the present application discloses a means for safely driving the vehicle at a very low speed while carrying out a power take-out operation by a utility model registration application filed at the same time (Japanese Utility Model Application No. 61-136498).

[Problems to be solved by the invention]

However, in any of the above techniques, the state of the device driven by the engine output via the power take-off device is not added to the control condition. That is, when the engine rotation speed becomes higher than a predetermined value during the operation of the power take-off device for some reason, especially when the vehicle runs at a very low speed during the power take-out, the running speed of the vehicle rises above the predetermined value. Therefore, there is a concern that the rotation speed of the power take-off shaft may increase or that a malfunction of the device driven by the power take-out device may occur due to this.

The present invention is capable of safely and reliably operating an engine power take-off device from a work position other than the driver's seat in a vehicle equipped with a manually operated transmission and a clutch, and a device driven by the power take-out device. It is an object of the present invention to provide a vehicle engine power takeoff device that can ensure safety.

[Means for solving problems]

The first aspect of the present invention is to provide a transmission with an accessory power take-off shaft,
In an engine power take-off device for a vehicle, which comprises an actuator for disconnecting the power take-off shaft from a drive shaft of a transmission and a control circuit for programmatically controlling the operation of the actuator, the power take-out shaft is connected to an oil boost pump. Is
A means for electrically detecting the temperature of the oil is provided, and the control circuit issues a command to disconnect the power take-off shaft and the drive shaft when the temperature detected by the means is equal to or higher than a predetermined value. It is characterized by including.

A second invention of the present invention comprises the means for electrically detecting the rotational speed of the power take-off shaft according to the first aspect of the present invention, wherein the control circuit is configured such that the oil temperature is equal to or higher than a predetermined value and the power take-off shaft rotates. When the speed is equal to or higher than a predetermined value, a means for instructing disconnection between the power take-off shaft and the drive shaft is included.

[Work]

When the temperature of the oil of the booster pump connected to the power take-off shaft exceeds a predetermined value, or in addition, the rotation speed of the power take-off shaft exceeds a predetermined value, the power take-out device is automatically and forcibly Is disconnected from the engine output.

As a result, even if the PTO switch is installed at a position other than the driver's seat or the vehicle is traveling while performing the power take-out operation, the engine power take-off device can be operated safely or reliably or stopped.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 10 is a clutch (CL),
Reference numeral 20 is a transmission (TM), reference numeral 30 is a power take-off unit (PTO), and reference numeral 40 is a clutch pedal.

The clutch 10 is connected / disconnected by a clutch cylinder 52 that is operated by hydraulic pressure supplied via a pressure multiplier 51.

The power take-out unit 30 is configured to take out engine power by connecting the power take-out shaft 31 to the clutch output shaft 22 via the counter shaft 21 of the transmission 20, and the connection control thereof is a PTO connected to the vacuum tank 61. It is performed via the solenoid valve 62 for disconnection.

A plurality of PTO switches 81, 82 and a PTO connection / disconnection solenoid valve 62 are connected to the microprocessor 71 via an input / output control device 72. The PTO switch is, for example, a PTO
The switch 81 is arranged in the driver's seat and the PTO switch 82 is arranged in the working position.

As means for connecting and disconnecting the clutch 10, a first hydraulic system controlled by the clutch pedal 40 and a microprocessor 71
And a second hydraulic system controlled by the above, and these two hydraulic systems are switched and supplied to the pressure multiplier 51. That is, the first hydraulic system is a system that supplies the output hydraulic pressure of the master cylinder 53 that is interlocked with the operation of the clutch pedal 40 to the pressure multiplying device 51 via the switching valve 54. The second hydraulic system is a system that supplies the output hydraulic pressure of the actuator 55 to the pressure multiplier 51 through the switching valve 54.

The drive control of the actuator 55 is performed via a clutch connecting / disconnecting solenoid valve 63 connected to the vacuum tank 61.

Further, the microprocessor 71 includes an input / output control device 72.
Via clutch sensor 13, transmission setting state detection sensor
23, the PTO sensor 33, the clutch switch 43, and the clutch connecting / disconnecting solenoid valve 63 are connected. The clutch switch 43 is turned on when the clutch pedal 40 is stepped on, and turned off when it is in the released state.

The present invention relates to a device capable of safely, reliably and automatically operating the power take-out section 30 by one-touch operation of the PTO switch 81 or 82, and allowing the vehicle to travel at a very low speed during power take-out. To ensure the safety of the oil pressure pump 35 and other devices connected to
The first aspect of the present invention includes the sensor 36 that detects the temperature of the oil discharged from the booster pump 35. In the second invention of the present invention,
A sensor 32 for detecting the rotation speed of the power takeoff shaft 31 is provided.
Then, the outputs of the sensors 32, 36 are connected to the microprocessor 71 via the input / output control device 72, and before the device (35) connected to the power take-off shaft 31 becomes defective,
The microprocessor 71 performs control to forcibly disconnect the power take-off shaft 31 and the counter shaft 21.

Note that, although FIG. 1 shows the embodiment of the first invention and the embodiment of the second invention at the same time for the sake of convenience, as shown in this embodiment, the device driven by the power take-out unit 30 is boosted. In the case of the pump 35, only one of them may be mounted, or both sensors 32 and 36 may be installed at the same time as shown in FIG.
May be mounted and the logical product thereof may be taken.

When the device connected to the power take-off shaft 31 is a device that directly utilizes the rotation, the sensor 32 that detects the rotation speed of the power take-out shaft 31 or the rotation speed of the input shaft of the device is detected. The output value from the sensor is a microprocessor
It becomes the composition taken in by 71.

Hereinafter, a series of procedures at this time will be described with reference to FIGS. 2 and 3.

FIG. 2 is a flowchart for explaining the procedure for operating the power take-out unit 30.

When the PTO switch 81 or 82 is turned on, the clutch switch 43 detects whether or not the clutch pedal 40 is in the open state, and the transmission setting state detection sensor 23 further determines whether or not the transmission 20 is in the neutral state. To detect.

When the clutch pedal 40 is not in the released state, that is, when the vehicle is running or stopped and is in the middle of a gear shifting operation, or when the vehicle is stopped due to clutch disengagement, P
Disable the ON of the TO switches 81 and 82. Also the transmission
When the vehicle 20 is not in the neutral state, that is, when the vehicle is traveling or when the transmission 20 is shifted in an attempt to travel, the PTO switches 81 and 82 are turned off.

Therefore, only when the clutch pedal 40 is in the released state (clutch contact) and the transmission 20 is in the neutral state, the PTO switches 81 and 82 are turned on and the clutch connection / disconnection solenoid valve 63 is turned on. . When the solenoid valve 63 for connecting and disconnecting the clutch is turned on, the actuator 55 operates,
Hydraulic pressure is sent to the pressure multiplying device 51 via the switching valve 54 to operate the clutch cylinder 52 to disconnect the clutch 10.

After the clutch sensor 13 confirms that the clutch 10 is disengaged, the power take-off shaft 31 is connected to the clutch output shaft 22 through the counter shaft 21 by turning on the PTO connection / disconnection solenoid valve 62. Confirm this by. When the confirmation is obtained, the clutch connecting / disconnecting solenoid valve 63 is turned off, and the actuator 55 is operated to gradually bring the clutch 10 into the connecting state.

The clutch sensor 13 confirms the contact of the clutch 10 to start the power take-out operation.

At this time, both the first hydraulic system controlled by the clutch pedal 40 and the second hydraulic system controlled by the actuator 55 are in a low hydraulic pressure state, and the hydraulic pressure for disengaging the clutch 10 can be supplied from either of them. It is in.

FIG. 3 is a flowchart illustrating a procedure for stopping the power take-out unit 30.

The microprocessor 71, during the operation of the power takeoff unit 30,
PTO switches 81, 82, clutch sensor 13, sensor 32,
The sensor 36 is being monitored.

The normal power take-out operation is performed while the vehicle is stopped, the PTO switches 81, 82 are in the on state, the clutch pedal 40 is in the open state, and the output values of the sensors 32, 36 are less than the predetermined value. Continue operation.

When the PTO switches 81 and 82 are turned off in this state, the clutch connecting / disconnecting solenoid valve 63 is turned on, the actuator 55 is operated, and the clutch 10 is disengaged. Clutch sensor
When detecting that the clutch 10 is disengaged by turning off the PTO switches 81 and 82, the switch 13 turns off the PTO connection / disconnection solenoid valve 62.

As a result, the power take-off shaft 31 is separated from the counter shaft 21. When the PTO sensor 33 confirms this,
If the clutch 10 is disconnected due to the PTO switches 81 and 82 being turned off, the clutch connecting / disconnecting solenoid valve 63 is turned off.
With 10 in contact, clutch control by the first hydraulic system by operating the clutch pedal 40 is enabled.

When the clutch sensor 13 detects that the clutch 10 is disengaged by depressing the clutch pedal 40 during the operation of the power take-out unit 30, the PTO solenoid valve 62 is immediately turned off. As a result, the power take-off shaft 31 is separated from the clutch output shaft 22 and the vehicle can be driven.

Here, when the rotation speed of the power take-off shaft 31 rises and the output value of the sensor 32 becomes a predetermined value or more, and / or the temperature of the discharge oil of the booster pump 35 rises and the output value of the sensor 36 becomes a predetermined value or more. When it becomes, the solenoid valve 62 for PTO disconnection is immediately turned off. As a result, the power take-off shaft 31 is forcibly disengaged from the clutch output shaft 22 without operating the clutch.

Therefore, the safety of the booster pump 35 and other driven devices is ensured.

〔The invention's effect〕

As described above, the present invention, even if the engine rotation speed may exceed a predetermined value during operation of the power takeoff device,
Before the power take-off device becomes defective, the power take-off device can be stopped to ensure its safety.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a flowchart explaining the operation of the present invention. FIG. 3 is a flowchart explaining the operation of the present 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-out unit (PTO), 31 …… Power take-out shaft, 32 …… Sensor, 33 …… PTO sensor, 35 …… Boost pump, 36 ……
Sensor, 40 …… Clutch pedal, 43 …… Clutch switch, 51 …… Pressure multiplier, 52 …… Clutch cylinder, 53
...... Master cylinder, 54 ...... Switching valve, 55 ...... Actuator, 61 ...... Vacuum tank, 62 ...... PTO connection solenoid valve, 63 ...... Clutch connection solenoid valve, 71 ...... Microprocessor, 72 ... I / O controller, 81, 82 PTO switch.

Front page continuation (72) Inventor Takeshi Togashi 3-1, 1-1 Hinodai, Hino City, Tokyo Hino Motors Co., Ltd. (56) Reference JP-A-60-229825 (JP, A) JP-A-61-57430 (JP, A) JP-A-57-138427 (JP, A)

Claims (2)

[Claims] Claim: What is claimed is: 1. An engine power of a vehicle comprising: a transmission having an auxiliary power take-off shaft; an actuator for connecting and disconnecting the power take-off shaft to a drive shaft of the transmission; In the take-out device, the power take-out shaft is connected to an oil boosting pump, and means for electrically detecting the temperature of the oil is provided, and the control circuit is configured so that when the temperature detected by the means is a predetermined value or more. An engine power take-off device for a vehicle, further comprising means for instructing disconnection between the power take-off shaft and the drive shaft. 2. An engine power of a vehicle comprising: a transmission having an auxiliary power take-off shaft; an actuator for connecting and disconnecting the power take-out shaft to a drive shaft of the transmission; and a control circuit for programmatically controlling the operation of the actuator. In the take-out device, the power take-off shaft is connected to an oil pressure pump, and means for electrically detecting the temperature of the oil and means for electrically detecting the rotational speed of the power take-off shaft are provided. The circuit includes means for instructing disconnection between the power take-off shaft and the drive shaft when the temperature of the oil is above a predetermined value and the rotational speed of the shaft of the power take-off shaft is above a predetermined value. A vehicle engine power take-off device characterized by: