JPH0732233Y2 - Power take-off control circuit - Google Patents

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a power take-off control circuit.

[Prior art]

In a specially equipped vehicle with a power take-off (hereinafter referred to as PTO) attached to the automatic transmission, for example, as shown in the system diagram of FIG. 3, the output of the engine 01 is used to drive the wheels through an automatic transmission including a torque converter 02 and a planetary gear 03. , Output is taken from input shaft 05 via gear 06 to PTO04. Here, PTO04 is connected by a manual lever or by an electromagnetic actuator.

[Problems to be solved by the device]

By the way, there are many people who are unfamiliar with the automatic transmission with PTO because of the fact that it is not widely used at present. Therefore, in this type of automatic transmission, if you cannot connect the PTO without selecting the driving range (1,2, D, R), select the stop range (N, P) after connecting the PTO. Instead, there is a fear that the vehicle will suddenly start when trying to use the PTO while keeping the driving range (1, 2, D, R). The present invention has been proposed in view of such circumstances, and when the select lever of the automatic transmission is selected to the driving range and the PTO switch is turned on to connect the PTO, an alarm is issued and the select lever is set to the stop range. It is an object of the present invention to provide a safe power take-off control circuit that prompts selection and prevents the occurrence of an accident.

[Means for Solving the Problems]

To this end, the present invention provides an electromagnetic actuator that engages and disengages a power take-off gear on the output side of a torque converter installed in an automatic transmission, a manual power take-off switch that continues the current supplied from a power supply to the electromagnetic actuator, and a select switch. It is turned on and off by detecting that the select lever is in the running range and in the stop range in conjunction with the lever.
A power take-off device comprising a lever position detecting means for FF operation and an electromagnetic relay means connected in series to the power take-off switch and for interrupting the current supplied to the electromagnetic actuator in conjunction with the ON / OFF operation. In the above, in parallel with the electromagnetic relay means, and an alarm means that is connected in series to the lever position detecting means and that the current supplied in conjunction with the ON / OFF operation is intermittent.
An alarm electromagnetic relay unit that is connected in series with the alarm unit and that connects and disconnects the current supplied to the alarm unit in conjunction with the power take-off switch is provided, and the select lever is in the traveling range, and When the power take-off switch is in a state capable of supplying a current, the electromagnetic actuator is operated and the alarm means is operated, and when the alarm means is operated, the select lever is in the stop range. It is characterized in that the alarm means is inactivated.

With this configuration, when the select lever of the automatic transmission is selected to the travel range, the lever position detection means detects that the select lever is in the travel range and performs ON or OFF operation. However, in conjunction with this ON or OFF operation, the electromagnetic relay means supplies the current supplied to the electromagnetic actuator and the current supplied to the alarm means.When the power take-off switch is operated in this state, the electromagnetic Current is supplied from the power supply to the actuator, the electromagnetic actuator operates, the take-off gear is engaged, and the alarm electromagnetic relay means energizes the current supplied to the alarm means to operate the alarm means. When the select lever is selected from the stop range, the lever position detection means Detects that the select lever is in the stop range and turns ON or OFF.
The current supplied to the alarm means is cut off in conjunction with the N or OFF operation, and the alarm means is deactivated.

【Example】

The lever position detecting means of the present invention may have a function of interlocking with the select lever to detect whether the select lever is in the traveling range or the stop range and is turned on or off. Therefore, in conjunction with the select lever, the inhibitor that detects the state where the select lever is in the running range and the state where it is in the stop range is turned on or off to interrupt the current supplied to the engine starter motor. The lever position detecting function of the switch may be combined with the function of the lever position detecting means of the present invention.
An embodiment of the present invention in which the function of the lever position detecting means is also used for the lever position detecting function of the inhibitor switch will be described with reference to the drawings. FIG. 1 is its entire circuit diagram, and FIG. 2 is a modification of FIG. It is the same whole circuit diagram shown. First, in FIG. 1, 1 is a battery, 2 is a key switch, 3 is provided as a lever position detecting means, and is linked to a select lever (not shown) of an automatic transmission, and the select range of the select lever (not shown) is a travel range. In the 1st, 2nd, D, and R speeds, the corresponding contacts are turned on and the stop range is P.
Inhibitor switch that turns off at the speeds N and 4, 4 is a normally open contact relay that is an electromagnetic relay means, 5 is a parking brake switch that is turned on when a parking brake (not shown) is activated, 6 is a PTO switch, and 7 is a PTO display light,
8 is a PTO detection switch that turns on by detecting the connection of the PTO,
9 is an electromagnetic actuator for engaging the PTO gear, 1
Reference numeral 0 is a buzzer which is an alarm means, 11 is a normally open contact relay which is an electromagnetic relay means for alarm, and 12 is a diode. In such a device, PTO connection is performed as follows. (1) First, when the key switch 2 is turned on and the select range of the select lever (not shown) of the automatic transmission is set to one of the driving ranges 1st speed, 2nd speed, D speed, and R speed, the inhibitor switch 3 is turned on. Then, a parking brake (not shown) is operated to turn on the parking brake switch 5. (2) Then, a current passing through the battery 1, the key switch 2, the inhibitor switch 3 and the parking brake switch 5 flows in the circuit of the exciting coil of the normally open contact relay 4 to excite the normally open contact relay 4 and normally open it. Turn on the contact of the contact relay 4. (3) Here, when the PTO switch 6 is turned on, current flows from the battery 1 to the electromagnetic actuator 9 through the key switch 2, the contact of the normally open contact relay 4, and the PTO switch 6.
The electromagnetic actuator 9 operates to connect the PTO gear to the input shaft gear. At that time, a current also flows through the exciting coil of the normally open contact relay 11, and the contact of the normally open contact relay 11 is closed, so that the buzzer 10 sounds. In addition, the electromagnetic actuator 9 operates to activate the PT (not shown).
When the O-gear meshes with the torque converter output shaft (not shown), the PTO detection switch 8 turns on, so current flows from the battery 1 to the key switch 2, the PTO detection switch 8, and the PTO indicator lamp 7 to display the PTO indication. The lamp 7 lights up. (4) By the way, in the above operation, after the buzzer 10 sounds, if the inhibitor switch 3 is left on while the select range of the select lever (not shown) remains in the running range, the battery 1 causes the key switch 2, Since current flows through the contacts of the inhibitor switch 3, the buzzer 10, and the normally-open contact relay 11, the buzzer 10 does not stop ringing and the driver sets the select range of the select lever (not shown) to the stop range to turn off the inhibitor switch 3. Urge you to. (5) Here, if the driver sets the select range of the select lever (not shown) to the stop range (N, P), the inhibitor switch 3 is turned off, and no current flows to the buzzer 10, and the buzzer 10 stops ringing. The diode 12 has the following effects. That is, after operating the electromagnetic actuator 9 to mesh the PTO gear (not shown) with the torque converter output shaft (not shown), the driver is prompted by the alarm of the buzzer 10 to change the select range of the select lever (not shown) to the stop range (N, When P) is selected and the inhibitor switch 3 is turned off, no current flows in the excitation circuit of the normally open contact relay 4, the contact of the normally open contact relay 4 is turned off, and even if the PTO switch 6 is turned on, the electromagnetic actuator No current will flow to 9. Therefore, in order to prevent the electromagnetic actuator 9 from deactivating at that time, the PTO
When the detection switch 8 is turned on, the key switch 2 and the PTO detection switch 8 are connected to the PTO switch 6 via the diode 12.
The electromagnetic actuator 9 is operated so that a current flows through the electromagnetic actuator 9. Furthermore, from the PTO detection switch 8 to the PTO indicator light 7
An electric current is passed through to inform that the PTO is operating. Further, in a specially equipped vehicle, there is a case where a PTO work lever is provided separately from the PTO switch 6 for connecting the PTO. In such a case, as shown in FIG. 2 in the above-mentioned embodiment, the dump switch 13 and the dump indicator lamp 14 which are interlocked with the working lever (not shown) are connected in series to the key switch 2 so that a current flows. Buzzer
It is also possible to connect 10 and the dump switch 13 in series via the diode 15. In the figure, the same reference numerals as those in FIG. 1 indicate the same members as those in FIG. In a specially equipped vehicle equipped with such a working lever together with the PTO switch 6, a power take-off control circuit as shown in FIG. 2 is used to operate the electromagnetic actuator 9 to connect the PTO, and then to a transmission (not shown). When the selector switch (not shown) is in the traveling range and the inhibitor switch 3 is in the ON state, when the dump switch 13 linked to the work operation lever is turned on, the dump indicator light 14 lights up and the buzzer 10 operates.
Sounds.

[Effect of device]

In short, according to the present invention, an electromagnetic actuator for engaging and disengaging a power take-off gear on the output side of a torque converter provided in an automatic transmission, and a manual power take-off switch for intermittently supplying a current supplied from a power source to the electromagnetic actuator, It is connected in series with the power take-off switch, and lever position detecting means for interlocking with the select lever to detect whether the select lever is in the running range or in the stop range and performs ON / OFF operation. ON, O above
In a power take-off device provided with an electromagnetic relay means for connecting and disconnecting a current supplied to the electromagnetic actuator in synchronism with FF operation, in parallel with the electromagnetic relay means, and connected in series with the lever position detecting means. O above
Alarm means for interrupting the current supplied in conjunction with N, OFF operation, and alarm for serially connected to the alarm means and interrupting the current supplied to the alarm means in conjunction with the power take-off switch Electromagnetic relay means and provided,
In a state in which the select lever is in the traveling range and the power take-off switch is in a state in which current can be supplied, the electromagnetic actuator is activated and the alarm means is activated, and the alarm means is activated. When the select lever is in the stop range, the alarm means is inactivated, so that the select lever of the automatic transmission is selected to the driving range and the PTO switch is turned on to connect the PTO. The present invention is extremely useful in industry because a safe power take-off control circuit for preventing the occurrence of an accident can be obtained when an alarm is issued to prompt the selection lever to select the stop range.

[Brief description of drawings]

FIG. 1 is an overall circuit diagram showing an embodiment of the present invention, and FIG. 2 is an overall circuit diagram showing a modification of FIG. FIG. 3 is a system diagram showing a power transmission with a PTO of a known specially equipped vehicle. 1 …… Battery, 2 …… Key switch, 3 …… Inhibitor switch, 4 …… Normally open contact relay, 5 …… Parking brake switch, 6 …… PTO switch, 7 …… PTO indicator lamp, 8 …… PT
O detection switch, 9 …… electromagnetic actuator, 10 …… buzzer, 11 …… normally open contact relay, 12 …… diode, 13 …… dump switch, 14 …… dump indicator, 15 …… diode

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic actuator for engaging and disengaging a power take-off gear at an output side of a torque converter provided in an automatic transmission, a manual power take-off switch for intermittently supplying a current supplied from a power source to the electromagnetic actuator, and a select lever. The lever position detecting means for turning on and off by detecting the state in which the select lever is located in the traveling range and the state in which the select lever is located in interlock with the power take-off switch and the on-state. A power take-off device comprising electromagnetic relay means for connecting and disconnecting the current supplied to the electromagnetic actuator in conjunction with the OFF operation, in parallel with the electromagnetic relay means and in series with the lever position detecting means. The current supplied in conjunction with the above ON / OFF operation is cut off. And an electromagnetic relay means for alarm which is connected in series to the alarm means and is connected to the power take-off switch to interrupt the current supplied to the alarm means. When the power take-off switch is in the state of being positioned and the power take-off switch is in a state capable of supplying a current, the electromagnetic actuator is activated and the alarm means is activated. The power tech-off control circuit is configured so that the alarm means is inactivated when the state is located at 1.