JP2015044455A - Transfer pto control device of automatic mechanical transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer PTO control device of an automatic mechanical transmission in which abnormal conditions of control are determined and transition to a control mode of a transfer PTO is enabled in the case of normal conditions, in a transfer PTO vehicle for switching and controlling the power of the automatic mechanical transmission (AMT) to a vehicle traveling mechanism unit or a work mechanism unit.SOLUTION: A transfer PTO control device includes: a T/F PTO6 for switching the power from an engine 2 to a traveling mechanism unit 3 and a work mechanism unit 4 except the traveling through an automatic mechanical transmission 5; an operation instruction unit 10 for operating or stopping the T/F PTO6; a switching control unit for switching the AMT5 to the traveling mechanism unit 3 and the work mechanism unit 4, based on operation instructions of the operation instruction unit 10; and a control device 7 having determination means for determining normal or abnormal conditions of the switching control unit.

Description

  The present invention relates to a control device for a transfer PTO equipped with a PTO (Power-Take-Off) for extracting engine power for purposes other than traveling, and in particular, the abnormality of the control device in a vehicle equipped with a mechanical automatic transmission (AMT). The present invention relates to a transfer PTO control device that detects in advance.

  2. Description of the Related Art Conventionally, special vehicles including cargo handling vehicles such as garbage trucks and concrete mixer trucks include PTO-equipped vehicles equipped with PTO (Power-Take-Off) that extracts engine power for purposes other than traveling.

Such a PTO-equipped vehicle is also equipped with a mechanical automatic transmission (hereinafter abbreviated as AMT) in order to improve driving performance in the same way as a normal passenger car.
That is, in AMT, an automatic clutch device that can automatically connect and disconnect a clutch, an automatic transmission device that automatically selects a gear position, and the like are combined with a mechanical transmission having a structure similar to that of a manual transmission.
In this AMT, for example, at the time of starting, the accelerator pedal is depressed, and the fuel injection amount is injected into the engine in accordance with the accelerator opening (depressing amount of the accelerator pedal), the engine speed is increased, and the engine speed is increased. Control is performed so that the clutch is automatically connected in accordance with the rise.
Further, at the time of stopping, the control is performed so that the clutch is automatically disengaged when the accelerator pedal is not depressed and the accelerator is turned off or when the engine speed becomes lower than a predetermined speed.

By the way, in patent document 1, the transmission provided with the fluid coupling which receives the motive power transmission from an engine, the transmission device which directly connects this transmission and an engine, the PTO device, and the intermittent connection of this PTO device and a transmission. Automatic with PTO, equipped with a switching control means for switching the operation of the transmission device, a switching control means for switching the operation of the transmission, and a PTO control means for receiving an operation signal and outputting an operation signal to the switching control means when the PTO device is put into operation A lockup control device for a vehicle with a transmission is disclosed.
Thereby, since the engine and the transmission are directly connected during the PTO operation, the power loss in the fluid coupling can be reduced.

Patent Document 2 relates to an automatic transmission device for a vehicle with a PTO having a torque converter, and a hydraulic control valve is provided between a pressure valve and a manual valve for the purpose of eliminating a loss of driving force due to the torque converter when the PTO is used. When the stop state is detected in the PTO use mode, the hydraulic control valve is turned off to control the manual valve so that it cannot travel, and the lockup clutch is operated during the intended start state. doing.
As a result, the loss of driving force by the torque converter when using the PTO can be eliminated simply by providing a hydraulic control valve in a normal automatic transmission.

Also, in Patent Document 3, in order to enable ultra-low speed running even when the engine speed of the truck is increased, the hydraulic pressure generated by driving the hydraulic drive pump is extracted from the truck transmission PTO. It is configured to drive the hydraulic motor, transmit this rotation to the transfer and transmit the power to the drive wheels to run the work, and in normal running, it can be driven by normal mechanical drive. ing.
As a result, normal driving of the vehicle is normal mechanical driving, hydraulic driving is only performed during work, and stepless speed change is possible, so that an optimum speed for the work can be selected.

JP-A-60-203535 JP-A-5-44831 JP-A-8-324267

However, none of Patent Documents 1 to 3 discloses a technique for detecting an abnormality of the transfer PTO control switching device.
That is, when the internal combustion engine is started, it is detected what state the PTO control is in, and if a problem has occurred, an alarm is issued to the driver to alert the driver and the vehicle starts. It can be said that it is an indispensable measure for safety to take measures to reliably prevent defects and overload on the clutch.
The present invention has been proposed from the above background, and in a transfer PTO-equipped vehicle that switches and controls the power of a mechanical automatic transmission (AMT) to a traveling mechanism unit or a working mechanism unit of a vehicle, control abnormality determination is performed. It is an object of the present invention to provide a transfer PTO control device for a mechanical automatic transmission that is capable of transitioning to a transfer PTO control mode in normal operation.

In order to solve the above-described problem, a transfer PTO that switches and transmits power from an internal combustion engine mounted on a vehicle to a traveling mechanism unit and a working mechanism unit other than traveling via a mechanical automatic transmission,
An operation command section for operating or stopping the transfer PTO;
A control device having switching control means for switching the mechanical automatic transmission between the traveling mechanism and the working mechanism based on an operation instruction of the operation command section, and a determination means for determining whether the switching control means is normal or abnormal And a transfer PTO control device for a mechanical automatic transmission.

According to this invention, when in the transfer PTO control mode due to some trouble, the mechanical automatic transmission allows the driver to move the change lever from the neutral position (N position) immediately after starting the internal combustion engine. When operated to the D position, the gear stage of the transmission is shifted to the transfer PTO gear stage of the transmission, and the vehicle cannot start.
Further, since the transmission PTO gear of the transmission has a small gear ratio, an excessive load is generated on the clutch.
In order to prevent the occurrence of such a problem, it is determined whether the switching means is normal or abnormal so that a corrective action can be taken.

  In the present invention, it is preferable that the determination unit is configured such that when the OFF signal indicating that the transfer PTO is OFF continues for a first predetermined time (T1) after the determination unit starts the determination, the transfer PTO It is preferable to determine that the controller is normal, and to release the prohibition of transition to the transfer PTO control mode for operating the transfer PTO.

  According to this invention, it is possible to determine with high accuracy by continuing the signal in which the transfer PTO is OFF for the first predetermined time (T1).

  In the present invention, it is preferable that the determination means does not continue the OFF signal of the transfer PTO within the first predetermined time within a second predetermined time (T2) longer than the first predetermined time after starting the determination. In this case, the transfer PTO is determined to be abnormal, and the control device may prohibit the transition to the transfer PTO control mode.

  According to this invention, by continuing the signal in which the transfer PTO is in the OFF state for the second predetermined time (T2), noise such as an operation delay of each device can be excluded, and determination with high accuracy is possible.

  In the present invention, it is preferable that the determination by the determination means is performed at the time of an ON operation before starting the starter of the ignition switch of the internal combustion engine.

  According to this invention, the transfer PTO control mode is entered due to some trouble, and it is impossible to start the vehicle by judging the abnormality before the internal combustion engine is started. Overload can be prevented.

  In the present invention, it is preferable that the determination unit invalidates the determination until the third predetermined time (T3) after the determination unit starts the determination, and prohibits the transition to the transfer PTO control mode.

  According to this invention, the determination can be made with high accuracy by performing the determination after the operation signal of each component in the operation command section or the like is stabilized.

  In a transfer PTO-equipped vehicle that switches and controls the power of the mechanical automatic transmission (AMT) to the vehicle travel mechanism or work mechanism, control abnormality is determined, and if normal, transition to the transfer PTO control mode A transfer PTO control device for a mechanical automatic transmission that can be provided can be provided.

1 is an overall block diagram showing an example of a vehicle equipped with a transfer PTO for carrying out the present invention. It is a circuit diagram which shows an example of the operation instruction | command part 10 which issues the transfer instruction | command of transfer PTO shown in FIG. 3 is a flowchart showing an example of a transfer PTO abnormality determination operation procedure executed based on a switching command from an operation command unit shown in FIG. 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the dimensions, materials, shapes, relative positions, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention unless otherwise specified, and are merely descriptions. It is just an example.

FIG. 1 shows a configuration example of an embodiment of a vehicle 1 equipped with a transfer PTO (hereinafter abbreviated as T / F PTO) 6 according to the present invention.
A vehicle 1 in which a T / F PTO 6 is mounted on a mechanical automatic transmission 5 (hereinafter abbreviated as AMT5) uses power from an engine 2 that is an internal combustion engine for purposes other than traveling, in addition to the traveling mechanism unit 3. A work mechanism unit 4 for performing work, and a control unit 7 for controlling them based on the operation of the operation command unit 10.
The engine 2 is a well-known diesel engine, and its power is transmitted to the T / F PTO 6 via the output shaft of the AMT 5.
The traveling mechanism unit 3 is a configuration necessary for vehicle traveling, and includes a wheel unit 3t (tire) to which a rotational force is transmitted via a differential gear mechanism (not shown) by a driving force transmission shaft (described later).

Here, for example, the working mechanism unit 4 is a concrete pump.
The vehicle 1 includes a T / F PTO 6 that is a power distribution mechanism that transmits the power from the engine 2 to the traveling mechanism unit 3 and the work mechanism unit 4 via the output shaft of the mechanical automatic transmission 5. ing.
That is, in this vehicle 1, the engine 2 and the T / F PTO 6 are mechanically connected to the output shaft of the AMT 5 via the front propeller shaft fps, and the T / F PTO 6 is connected to the traveling mechanism unit 3 and the rear propeller shaft rps. Connected through.
On the other hand, the T / F PTO 6 is connected to the working mechanism unit 4 via the PTO propeller shaft pps.
The T / F PTO 6 and the AMT 5 are coupled (directly coupled) to a specific gear stage (for example, 11th gear having a high gear ratio) at the time of PTO output.

  The T / F PTO 6 switches the power from the engine 2 to the traveling mechanism unit 3 and the working mechanism unit 4 and transmits the power to the driver's predetermined operation (parking brake operation, T / F PTO switch operation, mechanical automatic The transmission mechanism unit 3 or the work mechanism unit 4 is moved to the operation control mode, that is, the transfer PTO control mode for operating the transfer PTO or the normal driving mode of the vehicle. ECU7 (switching control part 7a) which performs operation | movement by is provided.

  The T / F PTO 6 includes an operation command unit 10 that performs a predetermined operation of the driver. That is, the operation command unit 10 is a changeover switch that detects a signal of a switching operation state of the T / F PTO switch 12 from an ON / OFF operation of the parking switch 11, the T / F PTO switch 12, and the T / F PTO switch 12. 13.

Here, the operation command unit 10 includes a normally open parking relay 11rl that is interlocked with the ON / OFF operation of the parking switch 11, and a normally open power relay 12rl that is interlocked with the T / F PTO switch 12. . The parking relay 11rl and the T / F PTO switch 12 are connected in series.
Further, the changeover switch 13 sends a signal indicating the operation state of the T / F PTO switch 12 applied to the ON / OFF of the T / F PTO switch 12 to the power relay 12rl via the magnet valve 13mv interlocked with the power relay 12rl. It has become. The power relay 12rl and the magnet valve 13mv are connected in series.

The magnet valve 13mv has two output pipes a1 and a2 that selectively output working air from an air tank (not shown) by an electromagnetic drive switching valve (three-way valve).
The changeover switch 13 includes a cylinder 13c and a shift rod 13r that moves back and forth in the axial direction in the cylinder 13c. The shift rod 13r has a piston 13rh that slides in the cylinder 13c in the axial direction, and the output pipes a1 and a2 of the magnet valve 13mv communicate with the cylinder 13c with the piston 13rh interposed therebetween. The shift rod 13r is provided with contact switches Lsw1 and Lsw2 that are in press contact with each other in the direction perpendicular to the axis. The shift rod 13r is provided with a recess 13rd, and when the shift rod 13r moves in the axial direction, the contact switches Lsw1 and Lsw2 engage and disengage from the recess 13rd and turn on and off.

The contact switches Lsw1 and Lsw2 are connected to indicator lamps L1 and L2, respectively, which indicate the ON / OFF state of the T / F PTO switch 12 by blinking.
A normally open power relay 14rl that operates in conjunction with the contact switch Lsw2 is connected to the output side of the contact switch Lsw2.
The ECU 7 is connected to the power relay 14rl.
A signal (PTOCP) transmitted from the power relay 14rl to the ECU 7 represents a T / F PTO ON / OFF state.
That is, the ECU 7 detects the ON / OFF state of the T / F PTO switch 12 based on the T / F PTO ON / OFF signal.

The ECU 7 includes a determination unit 7b that is a determination unit that determines abnormality of the control device, and a switching control unit 7a that is a switching control unit that controls switching between the traveling mechanism unit and the working mechanism unit. ing.
The switching control unit 7 a controls switching between the traveling mechanism unit and the working mechanism unit by the operation of the operation command unit 10.

The operation of the operation command unit 10 will be described.
The erroneous operation alarm control device in the vehicle 1 equipped with the T / F PTO according to the present invention is configured as described above. First, the outline of power transmission switching of the vehicle 1 will be described.
When the driver starts the engine 2 of the vehicle 1 equipped with the T / F PTO, the driver operates the ignition switch (not shown) in the cabin while pulling the parking brake (not shown) in the driver's seat. Let
In the operation command unit 10, the parking switch 11 is in an ON state when the parking brake is operating.
In this state, the parking relay 11rl is closed by the exciting coil, but the power relay 12rl is not excited because the T / F PTO switch 12 is in the OFF state.
Accordingly, the magnet valve 13mv is not excited. The operating air from the air tank is sent into the cylinder 13c through the output pipe a1 of the two output pipes a1 and a2, the contact switch Lsw2 on the PTOsw side remains off, the indicator lamp L2 does not light up, and the power The relay 14rl is not excited. As a result, the ECU 7 executes the control procedure in the ECU 7 (switching control unit 7a), assuming that the T / F PTO switch 12 remains off.

  The switching control unit 7a recognizes that the T / F PTO switch 12 is off and shifts to the normal travel mode. When the driver switches the mechanical automatic transmission 5 to the drive position and releases the parking brake (the parking switch 11 is turned off), the power of the engine 2 is transmitted to the front propeller shaft via the output shaft of the mechanical automatic transmission 5. It is transmitted to the traveling mechanism unit 3 through fps, T / F PTO 6 and the rear propeller shaft rpf, and the wheel unit 3t can be rotated to travel.

On the other hand, when transmitting power to the working mechanism unit 4, the driver turns on the T / F PTO switch 12 in the cabin, turns the parking switch 11 ON, and moves the mechanical automatic transmission 5 to the neutral position (hereinafter referred to as N position). For short).
At this time, in the operation command unit 10, the parking relay 11rl is closed by the parking switch 11ON. Since the T / F PTO switch 12 is ON and the power relay 12rl is excited and closed, the magnet valve 13mv interlocked with the power relay 12rl is excited. For this reason, the air flow path is switched, and the working air from the air tank is sent into the cylinder 13c through the output pipe a2 of the two output pipes a1 and a2. For this reason, the contact switch Lsw2 on the PTOsw side is turned on, the indicator lamp L2 is turned on, and the power relay 14rl is excited. As a result, a signal indicating that the T / F PTO switch 12 has been turned ON is sent to the ECU 7, and the control procedure in the switching control unit 7a is executed.

The switching control unit 7a recognizes that the T / F PTO switch 12 is turned on by a signal indicating that the T / F PTO switch 12 is turned on from the operation command unit 10, and the parking switch 11 is turned on. On condition that the mechanical automatic transmission 5 is switched to the neutral position, it is possible to shift to the T / F PTO control mode execution unit.
Thus, since the parking switch 11 is ON and the mechanical automatic transmission 5 is switched to the neutral position, it is possible to shift to the T / F PTO control mode for the first time. Even if the FPTO switch 12 is touched and turned on, the clutch is engaged against the driver's intention and the vehicle can be prevented from starting to move.

Next, the determination control procedure of the determination unit 7b, which is a determination unit that determines abnormality of the control device, will be described based on the flowchart shown in FIG.
In step S1, start.
In step 2, when the driver operates an ignition switch (not shown) for starting the engine 2 to the ON position, the determination unit 7b starts.
At this time, the engine 2 is not activated.

In step S3, the control device 7 prohibits transition to the T / F PTO control mode.
This is because if the control device 7 has been switched to the T / F PTO control mode due to some trouble, when the driver operates the change lever from the neutral (N position) to the D position for starting, the transmission gear The gear is shifted to the transmission PTO gear of the transmission, and the vehicle cannot start.
Further, the transmission PTO gear stage of the transmission is for preventing an excessive load from being generated on the clutch because the gear ratio is small.

Proceeding to step S4, counting of time T3, which is the third predetermined time, is started.
The time T3 that is the third predetermined time corresponds to a preparation time until the operation command unit 10 and each device perform a sufficient function, and is for obtaining a more accurate and stable signal.
In this embodiment, the time T3 is set to 3 seconds, but the increase / decrease in time can be arbitrarily determined by the circuit, the entire system, and the like.
In step S5, the count of T3 is continued.
In step S6, it is determined whether or not T3 has passed a specified time.
In step S6, when T3 has not passed the specified time, No is selected and the process returns to step S5.
In step S6, if T3 has passed the specified time, the process proceeds to step S7.

In step S7, the abnormality determination of the control device 7 is started.
Specifically, the abnormality determination of the signal (PTOCP) transmitted from the power relay 14rl to the ECU 7 is started.
In this abnormality determination, contact fixing of each relay, disconnection, On-Off signal hunting, the switching control unit 7a, the T / F PTO 6, and the like are targeted.
In step S8, counting of the time T1 that is the first predetermined time and the time T2 that is the second predetermined time is started.
Time T1, which is the first predetermined time, is a time for confirming that the switching control unit 7a is not in the T / F PTO control mode.
In other words, if a signal with a behavior that is not expected in a normal state, such as the above-described PTOCP ON state or ON / OFF state being unnaturally repeated, the relay contacts are stuck, disconnected, and the On-Off signal is hunted and switched. It is recognized that troubles such as the control unit 7a and the T / F PTO 6 have occurred.
Therefore, the time T1 is a continuous time for confirming whether or not such a malfunction signal (PTOCP abnormality signal) is continuously received for a predetermined time.
In this embodiment, the time T1 is set to 0.5 seconds, but the increase and decrease of the time can be arbitrarily determined by the circuit and the entire system.

The time T2, which is the second predetermined time, only needs to be confirmed within the predetermined time (sampling time).
That is, a signal from another device may be erroneously received, and the accuracy of the time T1 is improved by giving a margin for the sampling time.
In this embodiment, the time T2 is set to 1 second, but the increase / decrease in time can be arbitrarily determined by the circuit and the entire system.

Proceeding to step S9, counting of time T2, which is the second predetermined time, is continued.
Proceed to step S10. In step S10, it is confirmed whether or not a PTOCP abnormality signal is input.
In this case, both the time T1 and the time T2 have not passed the predetermined time.
If it is determined in step S10 that a PTOCP abnormality signal has been input, No is selected and the process proceeds to step S15.
In step S15, it is determined whether time T2 has elapsed.
When the time T2 has passed the predetermined time, the process proceeds to step S16. In step S16, the switching control device 7a is abnormal and an alarm device such as an alarm buzzer is activated, and the process proceeds to step S17.
On the other hand, if the time T2 has not passed the predetermined time in step S15, No is selected and the process proceeds to step S17.

In step S17, the time T1, which is the first predetermined time, is counted again.
Proceeding to steps S9 and S10, it is determined again whether or not a PTOCP abnormal signal has been received in step S10.
If the PTOCP abnormality signal is not input in step S10, the process proceeds to step S11, and the time T1 that is the abnormality determination time is continuously counted.
Proceed to step S12. In step S12, it is determined whether or not the time T1 has passed a predetermined time.
That is, it is determined whether or not the PTOCP abnormality signal has not been input continuously for T1 time.
If the time T1 has not passed the predetermined time, select No and return to step S9 to repeat.

In step S12, if the PTOCP abnormality signal is not input continuously for T1 time, Yes is selected and the process proceeds to step S13, where the switching control unit 7a, the operation command unit, and the T / F PTO 6 are determined to be normal. .
If the alarm device is turned on in step S16 in step S13, the alarm device is turned off in step S13. Proceed to step S14.

In step S14, the T / F PTO control mode transition prohibition executed in step S3 is canceled.
In this state, when the driver moves the change lever from the neutral position (N position) to the D position for starting, the transmission gear stage is operated to the driving gear stage, the vehicle cannot start, and the clutch is overloaded. It is possible to prevent problems such as giving
It progresses to step S18 and returns.

In this way, by determining the abnormality of the control device 7 of the T / F PTO 6 with high accuracy, when the driver operates the change lever from the neutral (N position) to the D position for starting, the transmission gear stage However, the gear is shifted to the transfer PTO gear of the transmission, and the vehicle cannot start.
Further, since the transmission PTO gear stage of the transmission has a small gear ratio, it is possible to prevent problems such as excessive load on the clutch.

  The present invention is applicable to a vehicle equipped with a T / F PTO.

1 vehicle 2 engine (internal combustion engine)
DESCRIPTION OF SYMBOLS 3 Traveling mechanism part 3t Wheel part 4 Working mechanism part 5 Mechanical automatic transmission 6 T / F PTO (transfer PTO)
7 ECU (control device)
7a Switching control unit (switching control means)
7b Determination unit (determination means)
10 Operation Command Unit 11 Parking Switch 12 T / F PTO Switch (Transfer PTO Switch)
13 changeover switch 13mv magnet valve T1 time first predetermined time T2 time second predetermined time T3 time third predetermined time

Claims (5)

A transfer PTO that transmits power from an internal combustion engine mounted on a vehicle to a traveling mechanism unit and a working mechanism unit other than traveling via a mechanical automatic transmission;
An operation command section for operating or stopping the transfer PTO;
A control device having switching control means for switching the mechanical automatic transmission between the traveling mechanism and the working mechanism based on an operation instruction of the operation command section, and a determination means for determining whether the switching control means is normal or abnormal A transfer PTO control device for a mechanical automatic transmission.   The determination unit determines that the transfer PTO is normal when an OFF signal indicating that the transfer PTO is OFF continues for a first predetermined time after the determination unit starts determination, and the control device 2. The transfer PTO control device for a mechanical automatic transmission according to claim 1, wherein the prohibition of transition to the transfer PTO control mode for operating the transfer PTO is canceled.   If the OFF signal of the transfer PTO does not continue for the first predetermined time within a second predetermined time longer than the first predetermined time after starting the determination, the determining means determines that the transfer PTO is abnormal, 3. The transfer PTO control device for a mechanical automatic transmission according to claim 2, wherein the control device prohibits transition to the transfer PTO control mode.   The transfer PTO control of a mechanical automatic transmission according to any one of claims 1 to 3, wherein the determination by the determination means is performed when the ignition switch of the internal combustion engine is turned on before starting the starter. apparatus.   5. The method according to claim 1, wherein the determination unit invalidates the determination until a third predetermined time after the determination unit starts determining, and prohibits the transition to the transfer PTO control mode. A transfer PTO control device for a mechanical automatic transmission according to claim 1.

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