JPH01195123A - Automatic transmission - Google Patents

Abstract

PURPOSE:To enable speed change operation while PTO is used by pulling out a gear of PTO when a speed change command is given during engagement of gears of PTO and conducting speed change operation according to a speed change command. CONSTITUTION:A proper gear position is calculated, and a gear position is automatically changed by an actuator to reach a value obtained by the above calculation. A power take-off is provided, thereby taking out power for purposes other than that for running. When a speed change command is given during engagement of gears of the power take-off, gears of the power take-off are pulled out, and speed change operation is conducted according to the speed change command.

Description

[Detailed description of the invention]

FIELD OF INDUSTRIAL APPLICATION] The present invention relates to automatic transmissions, and in particular calculates an appropriate gear position and automatically changes the gear position using an actuator so as to obtain the gear position obtained by this calculation. The present invention relates to an automatic transmission, and further relates to an automatic transmission suitable for use in an automatic transmission in which a mechanical clutch and a gear transmission are controlled by a microcomputer to perform an automatic gear change operation. KSummary of the Invention] The present invention provides that when a shift command is generated while driving while extracting power for purposes other than driving using a power take-off (PTO) provided in the transmission,
In addition to pulling out the gear of the PTO, the gear change operation is performed based on the shift command, allowing driving while the power take-off is in use, while also preventing a large load from being applied to the synchronizer of the transmission. It is something. K. PRIOR ART Automatic transmissions have been proposed to omit complicated gear shifting operations by drivers. In this automatic transmission, a calculation means such as a microcomputer selects the gears to be used depending on the vehicle speed, accelerator opening degree, etc., and an actuator meshes the selected gears to automatically obtain a predetermined gear ratio. This is what I did. By equipping an automobile with such an automatic transmission, the driver hardly needs to operate a lever to change gears. Note that prior art related to the present invention includes, for example, Japanese Patent Application Laid-open No. 127559/1982.
There is no description regarding 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 extract power for purposes other than driving through the PTO. Therefore, it becomes possible to use such an automatic transmission in various types of work vehicles. However, P.T.
When driving while using O and changing the gear position of the transmission to perform gear shifting operations, a large load is applied to the synchronizer of the transmission, which may cause undesirable functional deterioration such as premature wear of the synchronizer. may be invited. Therefore, in the past, in order to protect the synchronizer of the transmission, when the PTO gears were engaged, the gear shifting operation was, in principle, prohibited. Therefore, this may cause problems in the running of the vehicle. For example, in a garbage truck, if the PTO gear used to drive the beater that compresses garbage is engaged, the gear cannot be changed, and therefore the distance to the next garbage collection point is shortened. During long periods, it was especially difficult to drive. The present invention has been made in view of these problems, and it is an object of the present invention to provide a transmission that allows speed change operations even when a PTO is used. Means for Solving Problem K] As shown in FIG. 1, the present invention calculates an appropriate gear position and automatically changes the gear position using an actuator so that the value obtained by this calculation is obtained. In a transmission which is further provided with a power take-off and which extracts power for purposes other than driving, when a shift command is received while the gears of the power take-off are engaged, the gear of the power take-off is The gear shift operation is performed based on the gear shift command. K effect] Therefore, according to the present invention, when a shift command is generated while the PTO gears are meshing, the PTO gear is handled first, and then the shift operation is performed based on the shift command. This makes it possible to change gears when using the PTO.

【Example】

The present invention will be explained below with reference to an illustrated embodiment. FIG. 2 shows an automobile engine equipped with an automatic transmission according to an embodiment of the present invention, and this engine is composed of a diesel engine 10 for a truck. The diesel engine 10 is equipped with a fuel injection pump 11, which sequentially supplies fuel to each cylinder of the engine 10. The fuel injection pump 11 is connected to the engine 10 via a timer 12.
Moreover, the timing of fuel injection is adjusted by this timer 12. Furthermore, the fuel injection pump 11 is equipped with an electronic governor 13, which is used to adjust the amount of fuel injected. The flywheel housing 1 is located on the back side of the engine 10.
4 is provided, and a flywheel fixed to the end of the crankshaft is accommodated within this housing 14. A clutch 30 is provided on the back side of the flywheel, and a transmission 15 is attached to the back side of the flywheel housing 14 so as to be connected to the clutch 30. This transmission 15 has an engine 1
The rotation speed of 0 is changed to a predetermined value, and the propeller shaft 16
The signal is transmitted to the drive wheels via the The transmission 15 constitutes an automatic transmission, and a shift actuator 17 and a selection actuator 18 are provided above the transmission. Furthermore, a clutch actuator 19 for controlling connection and disconnection of a clutch 30 attached to the back side of the flywheel is connected to the transmission 1.
It is attached on the outer surface of the casing of No. 5. Furthermore, a fuel control actuator 20 is provided within the electronic governor 13 to adjust the position of the control rack and control the amount of fuel supplied. Note that the actuator 20 is composed of, for example, a near solenoid, and its plunger is connected to the fuel injection pump 11.
It is connected to the control rack. The position of this rack is detected by a rack sensor 28, which will be described later, and the detection output is supplied to the computer 21 to feedback control the actuator 20. and the above four actuators 17.18.19
．． 20 are adapted to be driven based on instructions from a microcomputer 21 via respective driving means. The input side of the microcomputer 21 is connected to a control box 22 . This control box 22 is equipped with a gear shift lever 23. Furthermore, this microcomputer 21 is connected to an accelerator sensor 25 that detects the opening degree of the accelerator or the amount of depression of the accelerator pedal 24. Further, the microcomputer 21 is connected to a vehicle speed sensor 26, an engine rotation sensor 27, a rack sensor 28, a clutch sensor 29, and a gear position sensor 31, respectively. The vehicle speed sensor 26 is provided on the side surface of the transmission 15 and detects the vehicle speed based on the rotational speed of the output side of the transmission 15. Further, the engine rotation sensor 27 is attached, for example, to the front side of the engine 10, and is adapted to detect the rotation speed of the engine 10. Further, the rack sensor 28 is attached to the front end side of the fuel injection pump 11, and is adapted to detect the position of the control rack of the fuel injection pump 11. Note that this sensor 28 is composed of, for example, a variable inductance type differential transformer, and the computer 21 uses the detection output from the linear solenoid 20.
is controlled by feedback. Further, the clutch sensor 29 is attached to the distal end side of the clutch actuator 19, and is adapted to detect the connected and disconnected states of the clutch 30. Further, the gear position sensor 31 is provided on the upper part of the transmission 15, and is adapted to detect the gear position. The transmission 15 also has a power take-off (
A PTO (PTO) 40 is provided so that power can be extracted for purposes other than driving. A solenoid valve 41 is connected to the PTO 40, and the solenoid valve 41 controls the supply and cutoff of compressed air.
40 gear positions are controlled. Also PTO
A gear position sensor 42 is provided at 40 and connected to the input side of the microcomputer 21. Furthermore, a PTO switch 43 and a PTO adjustment volume 44 are connected to the input side of the microcomputer 21. In addition, an indicator lamp 45 for displaying the status of the PTO 40
is connected to the output side of the microcomputer 21. Furthermore, a gear position indicator 46 that displays the gear position of the transmission 15 is connected to the microcomputer 21 . Next, the operation of this automatic transmission configured as described above will be explained. This operation is performed based on a program preset in the microcomputer 21, and when the shift lever 23 of the control box 22 is in the automatic shift position, the shift operation is automatically performed. ing. On the other hand, when the gear shift lever 23 is in the manual position, the manually selected gear shift operation is performed by the actuator 17.
．． This is done via 18. To give an overview of the automatic gear shifting operation, the microcomputer 21 detects whether the gear shift lever 23 of the control box 22 is in the automatic gear shifting position;
In the case of the automatic shift position, the amount of depression of the accelerator pedal 24 or the opening degree of the accelerator and the vehicle speed are read from the accelerator sensor 25 and the vehicle speed sensor 26, respectively, at regular intervals. Further, the microcomputer 21 reads a map stored in its memory, and based on this map, calculates whether automatic gear shifting is possible. If automatic gear shifting is possible, gear shifting is performed to obtain the calculated gear ratio. On the other hand, if it is determined that automatic gear shifting is not possible,
Do not perform gear shifting operations. The specific operation of automatic gear shifting is performed by the microcomputer 21.
Based on the command, the shift actuator 17 and the selection actuator 18 are activated via a drive means (not shown).
is operated to select a gear of the transmission 15, thereby achieving meshing of the selected gear of the transmission 15. Therefore, a predetermined gear ratio can be obtained in this way. Note that during this shift operation, the -H clutch 30 is switched to the disconnected state by the actuator 19, and the clutch 30 is brought into the connected state again in synchronization with the end of the shift operation. Transmission 1 that performs automatic gear shifting in this way
5 is provided with a PTO 40, and its gear position is controlled by compressed air by opening and closing a solenoid valve 41, thereby making it possible to extract power for purposes other than driving through the PTO 40. Moreover, this P
The TO40 can also be used while driving, allowing the vehicle to run while using the PTO40. To enable such operation, the transmission 15 is in neutral, and when the vehicle is stopped, the electronic governor 13 of the fuel injection pump 11 is used as an all-speed governor to control the fuel injection pump 11. . However, if the PTO can be used without the vehicle being driven, the transmission 15
If the transmission is automatically shifted, this transmission 1
A large load will be applied to the synchronizer of 5,
This may reduce the life of the synchronizer. Therefore, as shown in FIG. 3, when a shift command is issued while the vehicle is running, the gear of the PTO 40 is handled first and the shift operation is performed in this state. The microcomputer 21 reads the output of the PTO switch 43 and uses its gear position sensor 42 to control the PTO switch 43.
The gear position of TO40 is detected. Then, when the PTO switch 43 is ON, it is further determined whether the vehicle is stopped, and if the vehicle is stopped, the PTO 40 is put into gear. In this state, when the accelerator pedal is depressed, the vehicle starts. This starting operation is performed by the clutch 30 and automatic (-transmission 15).
It is carried out by Note that if the accelerator pedal is not depressed, the above steps are repeated without performing a starting operation. When the PTO switch 43 is 0FF (7) 1. : HaP
In addition to handling the TO gear, it also detects whether the accelerator pedal 24 is depressed when the vehicle is stopped,
When the pedal is depressed, a starting action is performed. On the other hand, when the vehicle is running, the presence or absence of a shift signal is detected, and if there is a shift signal, a shift operation is performed. If there is no gear shifting operation, the process returns to the starting step. Furthermore, as is clear from the program shown in Figure 3, P
If the TO switch 43 is ON and the gear shift signal is generated while the vehicle is running, the PTO
The gear will be pulled out, and after this the gear shifting operation will be performed. Therefore, it is possible to change gears while the PTO 40 is in use. If the vehicle stops after this, the PTO gear will be engaged again since the PTO switch 43 remains ON. In this way, the automatic transmission 15 according to this embodiment
The PTO 40 provided in the gear shifts the gear after the gear is disengaged when the gear is shifted while the gear is engaged. After that, when the vehicle stops, the PTO gear is engaged again. Therefore, while protecting the synchronizer of the transmission 15, the PTO
It is possible to change gears while in use. In addition, if you want the PTO40 gear to be engaged all the time, use the control box 2.
Hold running may be performed in which the gear position of the transmission 15 is fixed using the lever 23 of No. 2.

【Effect of the invention】

As described above, in the present invention, when a gear shift command is received while the gears of the power take-off are engaged, the gear of the power take-off is pulled out, and a gear shift operation is performed based on the gear shift command. Therefore, it is possible to change gears while the PTO is in use, and it is also possible to prevent a large load from being applied to the synchronizer of the transmission.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the gist of the present invention, FIG. 2 is a block diagram of an automatic transmission according to an embodiment of the present invention, and FIG. 3 is a flowchart showing a speed change operation of this automatic transmission. In addition, in the symbols used in the drawings, 15...Transmission 17...Shift actuator 18...Select actuator 21...Microcomputer 40...Power take-off 41...Solenoid valve 42...Gear Position sensor 43... is a PTO switch.

Claims (1)

[Claims] In addition to calculating the appropriate gear position, the actuator automatically changes the gear position to the value obtained by this calculation. Furthermore, a power take-off is installed, and the power take-off is used to control operations other than driving. In a transmission configured to extract a target power, when a gear shift command is received while the gears of the power take-off are engaged, the gear of the power take-off is pulled out and a gear shift operation is performed based on the gear shift command. Automatic transmission characterized by