JPH0676024B2 - Automatic transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission, and particularly to calculating an appropriate gear position and automatically changing the gear position to a gear position obtained by this calculation by an actuator. The present invention relates to an automatic transmission whose position is changed, and further to a suitable one used for an automatic transmission in which a mechanical clutch and a gear transmission are controlled by a microcomputer to perform an automatic shifting operation.

[Outline of Invention]

As shown in FIG. 1, the present invention connects an automatic transmission with a diesel engine having a fuel injection pump equipped with an electronic governor, and provides a power take-off for extracting power for purposes other than running, to the automatic transmission. Is to neutralize the power take-off to take out power, the electronic governor is explained as an all-speed mode, which allows the vehicle to run while taking out power using the power take-off. is there.

[Conventional technology]

Automatic transmissions have been proposed in order to avoid the driver's cumbersome shifting operations. This automatic transmission selects a gear used by a computing means such as a microcomputer according to a vehicle speed, an accelerator opening, etc., and meshes the gear selected by an actuator to automatically obtain a predetermined gear ratio. It was done. By equipping an automobile with such an automatic transmission, the lever operation for the driver to shift gears becomes almost unnecessary. As a prior art related to the present invention, for example, there is JP-A-52-127559, but there is no description relating to the gist of the present invention.

[Problems to be solved by the invention]

By attaching a power take-off (PTO) to such an automatic transmission, it becomes possible to take out power for purposes other than running through this PTO. When using a PTO, the governor of the fuel injection pump installed in the engine had to be an all-speed type in order to maintain its operating speed stable.
On the other hand, when the vehicle is driven by this engine, the governor must be of the highest and lowest type, which requires a governor changeover switch. That is, the PTO was used by switching the changeover switch to the all-speed mode, and the switch was set to the maximum / minimum mode at the time of traveling, thereby enabling the vehicle to start. Therefore, in such a conventional vehicle, there is a problem that the vehicle cannot be driven while using the PTO provided in the transmission.

The present invention has been made in view of the above problems, and an object thereof is to provide an automatic transmission that can travel while using a PTO.

[Means for solving problems]

The present invention is a transmission in which an appropriate gear position is calculated, and the gear position is automatically changed by an actuator so as to obtain a value obtained by this calculation, in which the transmission is a fuel injection system equipped with an electronic governor. A means for setting the electronic governor to the maximum / minimum mode in a normal running state, while connecting to a diesel engine having a pump so that the electronic governor selectively sets a maximum / minimum mode and an all-speed mode, A power take-off for extracting power for a purpose other than traveling from the input side of the transmission transmission mechanism, a determination means for determining whether the transmission is in neutral, and the determination means determines that the transmission is in neutral. The serial power take-off relates automatic transmissions, characterized in that the electronic governor and to provide a means for setting the all-speed mode when taking out the power.

[Action]

Therefore, under normal running conditions, the electronic governor is set to the maximum / minimum mode, which allows the vehicle to run, and it is also possible to take out power other than the desired power through the power take-off under the maximum / minimum mode if necessary. Become.

On the other hand, when the power is taken off by the power take-off when the transmission is in neutral such as when the vehicle is stopped, the electronic governor is set to the all speed mode. Power can be taken out stably through the power take-off.

〔Example〕

The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 2 shows an engine of an automobile equipped with an automatic transmission according to an embodiment of the present invention, which is composed of a diesel engine 10 for trucks. And this diesel engine 10 is a fuel injection pump
11 is provided, and the pump 11 sequentially supplies fuel to each cylinder of the engine 10. The fuel injection pump 11 is driven by the engine 10 via a timer 12, and the timing of fuel injection is adjusted by the timer 12. Further, the fuel injection pump 11 is equipped with an electronic governor 13,
13 is used to adjust the fuel injection amount.

A flywheel housing 14 is provided on the back side of the engine 10, and the flywheel fixed to the end of the crankshaft is housed in the housing 14. A clutch 30 is provided on the back side of the flywheel, and the clutch 30
A transmission 15 is attached to the rear side of the flywheel housing 14 so as to be connected to the transmission 15. The transmission 15 changes the number of revolutions of the engine 10 to a predetermined value and transmits it to the drive wheels via a propeller shaft 16.

The transmission 15 constitutes an automatic transmission, and the shift actuator 17 is provided above it.
And a select actuator 18 are provided respectively. Further, a clutch actuator 19 for controlling connection and disconnection of the clutch 30 mounted on the rear side of the flywheel is mounted on the outer surface of the casing of the transmission 15. Further, in the electronic governor 13, a fuel control actuator 20 for adjusting the position of the control rack and controlling the fuel supply amount is provided. The actuator 20 is composed of, for example, a linear solenoid, and its plunger is connected to the control rack of the fuel injection pump 11.
Then, the position of the rack is detected, and the detection output is supplied to the computer 21 to feedback control the actuator 20. The four actuators 17, 18, 19, 20 are each driven by driving means based on an instruction from the microcomputer 21.

The input side of the microcomputer 21 is connected to the control box 22. The control box 22 has a speed change lever 23. Further, the microcomputer 21 is connected to an accelerator sensor 25 which detects the accelerator opening degree or the depression amount of the accelerator pedal 24. Furthermore, the above-mentioned microcomputer 21 includes a vehicle speed sensor 26, an engine rotation sensor 27,
The rack sensor 28, the clutch sensor 29, and the gear position sensor 31 are connected to each other.

The vehicle speed sensor 26 is provided on the side surface of the transmission 15, and the vehicle speed is detected by the number of rotations on the output side of the transmission 15. The engine rotation sensor 27 is attached to the front side of the engine 10 and detects the rotation speed of the engine 10.
The rack sensor 28 is attached to the front end side of the fuel injection pump 11 and detects the position of the control rack of the fuel injection pump 11. The sensor 28 is composed of, for example, a variable inductance type differential transformer, and the detection output of
21 controls the linear solenoid 20 by feedback. The clutch sensor 29 is attached to the tip side of the clutch actuator 19 and
It is designed to detect 30 connection and disconnection conditions. The gear position sensor 31 is provided on the upper part of the transmission 15 and detects the gear position.

The transmission 15 has a further power take-off (PT
O) 40 is provided so that power for purposes other than traveling can be taken out from the gear of the counter shaft. A solenoid valve 41 is connected to the PTO 40, and this solenoid valve 4
By controlling the supply and cutoff of compressed air by 1, the gear position of the PTO 40 is controlled. The PTO 40 is also provided with a gear position sensor 42, which is connected to the input side of the microcomputer 21. Furthermore, on the input side of the microcomputer 21, the PTO switch 43 and P
The TO adjustment volume 44 is connected. Further, a display lamp 45 for displaying the status of the PTO 40 is connected to the output side of the microcomputer 21.

Next, the operation of the automatic transmission having the above structure will be described. This operation is performed based on a program preset in the microcomputer 21, and when the position of the speed change lever 23 of the control box 22 is the automatic speed change position, the speed change operation is automatically performed. ing. On the other hand, when the speed change lever 23 is at the manual position, the manually selected speed change operation is performed via the actuators 17 and 18.

The outline of the automatic shift operation will be described. The microcomputer 21 detects whether or not the position of the shift lever 23 of the control box 22 is the automatic shift position. In the case of the automatic shift position, the accelerator pedal 24 is operated at a constant cycle. The amount of depression or the accelerator opening and the vehicle speed are read from the accelerator sensor 25 and the vehicle speed sensor 26, respectively. Further, the microcomputer 21 reads a map stored in the memory and, based on this map, calculates whether automatic shift is possible or not. If automatic gear shifting is possible, the gear shifting operation is performed so as to obtain the calculated gear ratio. On the other hand, when it is determined that the automatic shift is impossible, the shift operation is not performed.

The specific operation of the automatic shift is such that, based on a command from the microcomputer 21, the shift actuator 17 and the select actuator 18 are actuated via drive means (not shown) so that the gears of the transmission 15 are selected. Which allows the meshing of selected gears of the transmission 15 to be achieved. Therefore, a predetermined gear ratio can be obtained in this way. During this shifting operation, the actuator 19
Thus, the clutch 30 is once switched to the disengaged state, and the clutch 30 is brought into the engaged state again in synchronization with the end of the shift operation.

The transmission 15 that automatically shifts in this way
The PTO4 which takes out power through the gear of the counter shaft
0 is provided, and by opening and closing the solenoid valve 41 and controlling the gear position with compressed air, it is possible to take out power for purposes other than traveling through this PTO 40. Moreover, this PTO40 can be used even while driving, and it is possible to drive while using the PTO40. Moreover, even when the vehicle is stopped and the transmission 15 is in neutral, power can be taken out through the PTO 40. In order to enable such operation, the transmission 15 is in neutral, and the electronic governor 13 of the fuel injection pump 11 is used as an all-speed governor to control the fuel injection pump 11 while the vehicle is stopped. .

That is, as shown in FIG.
Determines whether the PTO switch 43 is ON. When the switch 43 is OFF, the solenoid valve 41 is used to remove the gear of the PTO 40, and the electronic governor 13 is set to the highest and lowest modes. As a result, the fuel injection pump 11
Becomes normal control, and the accelerator pedal
The fuel is supplied according to the depression amount of 24, that is, the accelerator opening.

On the other hand, the PTO switch 43 has been turned ON,
And, if the speed change lever 23 of the control box 22 that controls the transmission 15 is neutral,
When the gear position sensor 42 detects that the gear of the PTO 40 is engaged, the electronic governor 13 is set to the all speed mode in conjunction with this detection. That is, the fuel injection pump 11 is controlled by the actuator 20 so as to have the rotation speed set by the PTO adjustment volume 44, whereby the output rotation speed of the PTO 40 can be controlled to a constant value. Note that this operation is performed only in the mode in which the speed change lever 23 of the control box 22 is in the neutral mode, and in other cases, the fuel injection pump 11 is controlled in the highest and lowest modes. There is. So, for example, when the vehicle is
When extracting power through the PTO40, the maximum and minimum modes are used, and the rotation speed will change in conjunction with the depression of the accelerator pedal.

As described above, according to the automatic transmission 15 according to the present embodiment, the maximum and minimum type governor and the electronic governor 13 are used during traveling.
Can be switched, which makes it possible to start the vehicle and control the shift. On the other hand, when the PTO40 takes out power while it is stopped, the electronic governor 1
The 3 is switched to the all-speed mode, which allows the PTO40 to be used while the vehicle is running.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention connects the transmission to a diesel engine having a fuel injection pump having an electronic governor, and allows the electronic governor to selectively set the maximum / minimum mode and the all-speed mode for normal traveling. In the state, the electronic governor is set to the highest and lowest modes, the power take-off that extracts power for the purpose other than running from the input side of the transmission transmission mechanism, the determination means to determine whether the transmission is in neutral, and the determination means. Means is provided for setting the electronic governor to the all speed mode when the transmission is determined to be neutral and power is taken off by the power take-off.

Therefore, with this configuration, the PTO
It becomes possible to take out power for purposes other than running through the. At this time, the electronic governor is set to the maximum / minimum mode, so that the running of the vehicle is not hindered.

Also, when the transmission is in neutral, the electronic governor is set to the all-speed mode when power is taken out by the power take-off, so it is possible to stably maintain the rotation taken out via the PTO. Therefore, it becomes possible to effectively use the power of such stable rotation speed for purposes other than traveling.

[Brief description of drawings]

FIG. 1 is a block diagram showing the gist of the present invention, FIG. 2 is a block diagram showing an automatic transmission according to an embodiment of the present invention, and FIG. 3 is a control operation of a PTO provided in this automatic transmission. It is a flowchart shown. In the reference numerals used in the drawings, 10 …… diesel engine 11 …… fuel injection pump 15 …… transmission 17 …… shift actuator 18 …… selection actuator 20 …… fuel control actuator 21 …… microcomputer 40 …… It is a power take-off.

Claims (1)

[Claims] 1. A transmission in which an appropriate gear position is calculated, and the gear position is automatically changed by an actuator so as to obtain a value obtained by the calculation, wherein the transmission is a fuel provided with an electronic governor. A means for setting the electronic governor to the maximum / minimum mode in a normal running state while being connected to a diesel engine having an injection pump so that the electronic governor selectively sets a maximum / minimum mode and an all-speed mode. , A power take-off that extracts power for a purpose other than traveling from the input side of the transmission transmission mechanism, a determination unit that determines whether the transmission is in neutral, and whether the transmission is determined to be neutral by the determination unit Automatic transmission, characterized in that so as to provide a means for setting the electronic governor when taking out the power by the power take-off in all speed mode.