JPH09301009A - Pto control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the power from being unexpectedly taken off, or the start-up of an engine from being damaged due to load applied to the engine even when an operator forgets to release a power transmitted state at the end of a work by a suspension, in a PTO control device of a manual transmission for controlling an electromagnetic clutch which takes off power from the engine for the suspension. SOLUTION: In relay-coil of a normally open PTO relay 14 connected to between a battery 1 and an electromagnetic clutch 6, a neutral detecting switch 7, a normally closed clutch relay 13, and a PTO switch 16 are connected in series to be connected to an ON contact of a starter switch 2. The relay 13 is formed into a connection structure where the relay is held OFF by turning ON a self-holding type PTO cut-relay 12 which is turned ON at the time when a clutch pedal is depressed or an engine is started. Even when an operator forgets to turn the PTO switch OFF, and the travel of a vehicle starts, or the engine is restarted, the relay 13 is turned OFF, and the electromagnetic clutch is positively held OFF. The power transmission state can no longer occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PT for controlling power extraction of a manual transmission to a bodywork device mounted on an automobile.
The present invention relates to an O control device (PTO: Power Take Off).

[0002]

2. Description of the Related Art Some automobiles are equipped with a bodywork device, such as a crane or a pump, which requires power during use. In many of such automobiles, when using the bodywork device, power is taken out from the engine used for traveling. The PTO control device is a device that controls the power output.

FIG. 2 is a diagram showing a conventional PTO control device. In FIG. 2, 1 is a battery, 2 is a starter switch, 3 is a PTO operation indicator lamp, 4 is a PTO relay, 4-
1 is a PTO relay coil, 4-2 is a PTO relay contact,
5 is a PTO switch, 6 is an electromagnetic clutch, 7 is a neutral detection switch, 8 is a neutral detection relay, 8--
Reference numeral 1 is a neutral detection relay coil, 8-2 is a neutral detection relay contact, and 9 is a starter.

The electromagnetic clutch 6 is for transmitting the power from the engine to the mounting apparatus, and the power can be transmitted when it is energized. The PTO switch 5 is a switch that is turned on when power is to be taken out to the bodywork device. In this example, a self-reset type switch that returns to its original state when the hand that is turned on is released is used. PTO relay 4 is P
This is a relay in which the PTO relay contact 4-2 is switched on and off each time the TO relay coil 4-1 is energized.
That is, if it is on, it is turned off, and if it is off, it is turned on and that state is maintained. The neutral detection switch 7 is a switch that is turned on when the position of the transmission gear is neutral.

For the ON contact of the starter switch 2, P
The TO relay coil 4-1 and the PTO switch 5 are connected in series, and the neutral detection switch 7 and the neutral detection relay coil 8-1 are also connected in series.
The electromagnetic clutch 6 is connected so as to be energized from the ON contact when the PTO relay 4 and the neutral detection relay 8 are turned on.

Next, the operation of taking out power from the bodywork device will be described. Power is taken out under the condition that the starter switch 2 is turned on to the ON contact and the transmission gear position is set to neutral (hence, the neutral detection switch 7 is turned on and the neutral detection relay 8 is turned on). This is possible by turning on the PTO relay 4. The PTO relay 4 is turned on by turning on the PTO switch 5.

At this time, a current flows through the path of battery 1 → ON contact of starter switch 2 → PTO relay contact 4-2 → electromagnetic clutch 6 → neutral detection relay contact 8-2 → ground, so the electromagnetic clutch 6 is turned on. The power can be transmitted from the engine side to the bodywork device side. When the electromagnetic clutch 6 is energized, the PTO operation indicator lamp 3 is also energized, so that it is lit to indicate the operation of the PTO.

In order to cancel the power transmission state, the PTO switch 5 is turned on and the PTO relay 4 is turned off to cut off the power supply to the electromagnetic clutch 6. At the same time, PT
The O operation indicator lamp 3 is turned off. On the other hand, even if the neutral detection switch 7 is turned off (that is, even when the transmission gear is changed to a gear other than neutral (a traveling gear or the like)), the electromagnetic clutch 6 is deenergized.

[0009] Note that, as conventional documents relating to the PTO control device, for example, Japanese Utility Model Publication No. 5-89064 and Japanese Utility Model Publication No.
-35154 and the like.

[0010]

[Problems to be Solved by the Invention] (Problem) However, in the above-mentioned conventional PTO control device, when the work by the bodyworking device is finished, the operation of releasing the power transmission state by the PTO switch 5 is forgotten. In this case, there is a problem in that the bodywork device may start operating unintentionally or the engine may not start easily.

(Explanation of Problems) (1) It is assumed that the vehicle is driven without forgetting to operate the PTO switch 5 to cancel the power transmission state. Since the transmission gear should have been changed from the neutral gear to the traveling gear prior to the start of traveling, the neutral detection switch 7 is turned off and the neutral detection relay contact 8-2 is turned off when the gear change is performed.
Therefore, the energization of the electromagnetic clutch 6 is cut off, so that the bodywork device is prevented from starting to operate during traveling. However, since the blocking of the operation of the bodywork device depends only on the operation of the neutral detection switch 7, if it does not operate correctly, it cannot be blocked, and it is extremely active during running. Be in a dangerous state.

(2) Further, the neutral detection switch 7
Will operate reliably and will be turned off during traveling, and the electromagnetic clutch 6
If the gear position is set to the neutral position when the vehicle is next stopped, the neutral detection switch 7 is turned on at that moment even if the operation of is blocked. Then, unexpectedly, the bodywork device suddenly starts to operate, which is dangerous. (3) Alternatively, some workers may stop the engine by turning off the starter switch 2 without performing the release operation by the PTO switch 5 when the work of the bodyworking device is completed. Apparently, the bodywork device stops operating, but the PTO relay contact 4-2 remains on and the neutral detection switch 7 remains on.

When the engine is started in this state, current flows through the ST contact of the starter switch 2 to the starter 9 and also through the ON contact to the electromagnetic clutch 6. Then, the engine is difficult to start for the following two reasons. The first reason is that when the electromagnetic clutch 6 is turned on, the bodywork device is connected to the engine, so that the load on the engine becomes much larger than that at the time of normal starting. The second reason is that the current from the battery 1 also flows to the electromagnetic clutch 6, so that the current to the starter 9 is reduced and the torque is reduced. This means
Although not necessary, a current is also supplied to the electromagnetic clutch 6 and the battery 1 is wasted. The present invention
It is an object to solve the above problems.

[0014]

In order to solve the above-mentioned problems, according to the present invention, in a PTO controller for controlling an electromagnetic clutch for taking out power from an engine of a vehicle of a manual transmission to a bodywork device, a battery and a PTO controller are provided. A normally open relay connected between the electromagnetic clutch, a neutral detection switch that is turned on when the transmission gear is in neutral, a PTO switch that commands the bodywork device to take out or release power, and the PTO switch The self-holding relay is turned on when the clutch pedal is depressed or the engine is started in a state where the take-out command is issued, and the normally-closed relay is kept off by turning on the self-holding relay. A coil, the neutral detection switch, the normally closed relay, and the PTO switch are connected in series to form a star. It was decided to connect to the ON contact of the data switch.

If one example of the concrete constitution is shown, for example,
A normally open first relay connected between a battery and the electromagnetic clutch, a clutch switch having one end connected to an ON contact of a starter switch and turned on when the clutch pedal is depressed, and one end of a relay coil being a starter switch. Connected to the ST contact and the clutch switch,
A self-holding normally open second relay having relay contacts connected to bypass the clutch switch; and a normally closed third relay having one end of a relay coil connected to the clutch switch and the second relay; The first relay,
When the PTO switch for collectively connecting the relay coils of the second relay and the third relay to the ground, one end is connected to the ON contact of the starter switch, the other end is connected to the third relay, and the shift gear is in neutral A neutral detection switch that is turned on is provided.

(Outline of the operation to be solved) Even if the PTO switch is forgotten to be turned off when the power is taken out,
When traveling or restarting the engine, the electromagnetic clutch is kept off by the following operation, so that power is not unintentionally taken out and the startability of the engine is not impaired.

That is, when a gear change is attempted to run, the clutch pedal is first depressed, which turns on the self-holding relay and turns off the normally closed relay. Similarly, when the engine is restarted, the self-holding relay is turned on and the normally closed relay is turned off. When the normally closed relay is off, the relay coil of the normally open relay connected to the electromagnetic clutch is not energized, so the electromagnetic clutch is kept off.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a PTO control device of the present invention. The reference numeral corresponds to that in FIG. 2 and is 10
Is a diode, 11 is a clutch switch, 12 is a PTO
Cut relay, 12-1 is PTO cut relay coil,
12-2 is a PTO cut relay contact, 13 is a clutch relay, 13-1 is a clutch relay coil, 13-2 is a clutch relay contact, 14 is a PTO relay, and 14-1 is P.
TO relay coil, 14-2 is PTO relay contact, 15
Is a diode, 16 is a PTO switch, 17 is a PTO operation indicator light relay, 17-1 is a PTO operation indicator light relay coil, and 17-2 is a PTO operation indicator light relay contact.
Since the same reference numerals as those in FIG. 2 are the same, the description thereof will be omitted.

The PTO cut relay 12 is a self-holding normally open relay. The clutch relay 13 is a normally closed relay and the PTO relay 14 is a normally open relay. The clutch switch 11 is a switch that turns on when the clutch is stepped on, and the PTO switch 16 is a so-called holding type switch that can be manually switched between the on and off states. The diode 10 and the diode 15 are for backflow prevention.

The electromagnetic clutch 6 is connected to the battery 1 via the PTO relay 14. PTO relay coil 14-
One end of 1 is connected to the ON contact of the starter switch 2 via the clutch relay 13 and the neutral detection switch 7, and the other end is connected to the ground via the diode 15 and the PTO switch 16. Further, one end of the clutch relay coil 13-1 is connected to the ON contact of the starter switch 2 via the parallel circuit of the PTO cut relay 12 and the clutch switch 11, and the other end is connected to the ground via the PTO switch 16. . One end of the PTO cut relay coil 12-1 is connected to the ST contact of the starter switch 2 via the diode 10 and is connected to the clutch switch 11, and the other end is connected to the ground via the PTO switch 16.

Next, the operation will be described. (When extracting power to the bodywork equipment) When trying to work with the bodywork equipment, the automobile is in the following state. The engine has already been started and the starter switch 2 is O
It is turned on to the N contact. The neutral detection switch 7 is on (because the vehicle is stopped and the transmission gear is in neutral). The clutch switch 11 is off (because the clutch pedal is not depressed).

Under such a condition, the PTO switch 16
Turn on. Then, battery 1 → starter switch 2
ON contact-> neutral detection switch 7-> clutch relay contact 13-2-> PTO relay coil 14-1-> diode 15-> PTO switch 16-> ground, and a current flows through the path to turn on the PTO relay contact 14-2.
As a result, a current flows through the route of battery 1 → PTO relay contact 14-2 → electromagnetic clutch 6 → ground, the electromagnetic clutch 6 is activated, and power can be transmitted from the engine side to the mounting apparatus side. In addition, a current also flows through the PTO operation indicator light relay coil 17-1 through the PTO relay 14, and the PTO operation indicator light relay contact 17-2 is turned on to set P
The TO operation indicator lamp 3 lights up.

(When releasing the power output to the bodywork device) The PTO switch 16 is turned off. Then PT
The current to the O relay coil 14-1 is cut off and the PTO relay contact 14-2 is turned off. Therefore, the electric current to the electromagnetic clutch 6 is cut off, and the power output is released.
At the same time, the PTO operation indicator light relay 17 also turns off, and P
The TO operation indicator lamp 3 is turned off.

(When forgetting to perform the release operation by the PTO switch 16) (1) When the vehicle is started after forgetting to turn off the PTO switch 16 after finishing the work using the bodywork device. Prior to traveling, the clutch pedal is depressed to change the transmission gear to the traveling gear, so the clutch switch 11 is turned on. Then, battery 1 → starter switch 2 is turned on
Contact → Clutch switch 11 → Clutch relay coil 1
3-1 → Current flows through the path of PTO switch 16,
The clutch relay contact 13-2 is turned off. for that reason,
The current to the PTO relay coil 14-1 was cut off, and the PTO
Since the relay contact 14-2 returns to off, the current to the electromagnetic clutch 6 is cut off. As a result, the power transmission state to the bodywork device is released. At the same time, the PTO operation indicating lamp relay 17 is turned off and the PTO operation indicating lamp 3 is turned off.

On the other hand, through the clutch switch 11,
Clutch switch 11 → PTO cut relay coil 12
Current also flows through the route of -1 → PTO switch 16 → ground, and the PTO cut relay contact 12-2 is turned on. Therefore, the clutch relay coil 13-1 has a PT
Power is also supplied through the O-cut relay contact 12-2. When the operation of the shift gear is completed and the clutch pedal is released, the clutch switch 11 returns to the off state.
The PTO cut relay contact 12-2 is not turned off. Because PTO cut relay contact 12-
This is because the current passing through 2 flows in the PTO cut relay coil 12-1 and is self-held. The self-holding is released when the ON contact of the starter switch 2 is turned off or the PTO switch 16 is turned off.

When the clutch pedal is depressed to change gears to shift to a non-neutral gear, the neutral detection switch 7 is turned off, which also cuts off the current to the electromagnetic clutch 6. This is an operation preventing operation of the electromagnetic clutch 6 similar to the conventional example, but in the present invention, the operation of the electromagnetic clutch 6 is ensured by connecting the clutch relay 13 in series to the neutral detection switch 7 and turning it off. Is blocked. (2) When the engine is stopped by forgetting to turn off the PTO switch 16 after finishing the work using the bodywork device, and then restarted. When the engine is started, the starter switch 2 is turned so that the ST contact is turned on, but at this time, the ON contact is also turned on. When the ST contact is turned on, a current flows through the route of battery 1 → ST contact → starter 9 → ground, the starter 9 operates, and the engine is started.

At this time, even if the PTO switch 16 is turned on, the fact that the electromagnetic clutch 6 is reliably turned on is as follows.
The operation is as follows. The current passing through the ST contact is ST contact → diode 10 → PTO cut relay coil 12-
The PTO cut relay contact 12-2 is turned on because it also flows in the path of 1 → PTO switch 16 → ground. Then, a current flows through a route of battery 1 → ON contact of starter switch 2 → PTO cut relay contact 12-2 → clutch relay coil 13-1 → PTO switch 16 → ground, so that the clutch relay contact 13-2 is turned off. . As a result, the PTO relay 14 is turned off and the energization of the electromagnetic clutch 6 is surely blocked.

Even if the ST contact is turned off and the ON contact is turned on after the engine has been started,
Since the PTO cut relay 12 is self-held by the current from the ON contact, the clutch relay contact 1 still remains.
Keep 3-2 off. That is, the prevention of energization to the electromagnetic clutch 6 is ensured even after the start is completed.

[0029]

As described above, according to the present invention, in the PTO control device for controlling the electromagnetic clutch for taking out the power from the engine of the vehicle of the manual transmission to the bodywork device, the battery and the electromagnetic clutch are connected. PT connected between
When the neutral detection switch, the clutch relay (normally closed) 13 and the PTO switch are connected in series to the relay coil of the O relay (normally open) 14 and connected to the ON contact of the starter switch, the clutch relay 13 is depressed when the clutch pedal is depressed. Alternatively, the PTO cut relay (self-holding type) 12 that is turned on when the engine is started is kept on by being turned on. Therefore, after finishing the work using the bodywork device, the electromagnetic clutch is surely kept off even if the vehicle is started or the engine is restarted without forgetting to turn off the PTO switch. Therefore, it is possible to prevent the power from being taken out and the engine from becoming difficult to start even though it is not intended. In addition, the battery will not be consumed unnecessarily.

[Brief description of drawings]

FIG. 1 is a diagram showing a PTO control device of the present invention.

FIG. 2 is a diagram showing a conventional PTO control device.

[Explanation of symbols]

1 ... Battery, 2 ... Starter switch, 3 ... PTO operation indicator light, 4 ... PTO relay, 4-1 ... PTO relay coil, 4-2 ... PTO relay contact, 5 ... PTO switch,
6 ... Electromagnetic clutch, 7 ... Neutral detection switch, 8
... Neutral detection relay, 8-1 ... Neutral detection relay coil, 8-2 ... Neutral detection relay contact,
9 ... Starter, 10 ... Diode, 11 ... Clutch switch, 12 ... PTO cut relay, 12-1 ... PTO cut relay coil, 12-2 ... PTO cut relay contact, 13 ... Clutch relay, 13-1 ... Clutch relay coil, 13-2 ... Clutch relay contact, 14 ... PTO
Relay, 14-1 ... PTO relay coil, 14-2 ... P
TO relay contact, 15 ... Diode, 16 ... PTO switch, 17 ... PTO operation indicator light relay, 17-1 ... PT
O operation indicator relay coil, 17-2 ... PTO operation indicator relay contact

Claims (2)

[Claims] 1. A P that controls an electromagnetic clutch for extracting power from an engine of a manual transmission automobile to a bodywork device.
In the TO control device, a normally open relay connected between the battery and the electromagnetic clutch, a neutral detection switch that is turned on when the transmission gear is in neutral, and a PTO switch that commands the body device to take out or release power. And a self-holding relay that is turned on when the clutch pedal is depressed or when the engine is started while the PTO switch is commanding the extraction of power, and a normally closed relay that is kept off by turning on the self-holding relay. Equipment
A PTO controller, wherein a relay coil of the normally open relay, the neutral detection switch, the normally closed relay and the PTO switch are connected in series to an ON contact of a starter switch. 2. A P that controls an electromagnetic clutch for extracting power from an engine of a manual transmission automobile to a bodywork device.
In a TO control device, a normally open first relay connected between a battery and the electromagnetic clutch, a clutch switch having one end connected to an ON contact of a starter switch and turned on when the clutch pedal is depressed, and a relay coil A self-holding normally open second relay, one end of which is connected to the ST contact of the starter switch and the clutch switch, and a relay contact of which is connected to bypass the clutch switch, and the clutch switch and the second relay. A normally closed third relay to which one end of the relay coil is connected, a PTO switch for collectively connecting the relay coils of the first relay, the second relay, and the third relay to ground, and one end of which is an ON contact of a starter switch. Connected to the
A PTO control device comprising: a neutral detection switch, the other end of which is connected to the third relay and which is turned on when the transmission gear is in neutral.