JPS61160323A - Automatic transmission - Google Patents

Abstract

PURPOSE:To allow a drive feeling at a time of cornering and others to be improved by arranging a detecting means to determine that the difference in revolution between a right and a left driving wheels exceeds the started value, so as to restrain a change-speed operation from being effected when the difference is found to exceed the stated value. CONSTITUTION:When a shift lever 23 is in an auto-position of an automatic transmission, a computer 21 allows the required gear ratio to computed based on the output signal from both an acceleration sensor 25 and a speed sensor 26 permitting actuators 17 and 18 for the shift selection to be controlled based on the computed result. This allows the gear of the transmission 15 to be automatically selected. In this case, the number of revolution of the right and left driving wheels 31 and 32 is detected by each of respective revolution sensors 34 and 35, and it is determined to see if the difference in revolution exceeds the stated value. And if the difference is found to exceed the stated value, a change-speed signal is allowed to be cancelled. This configuration restrains a change-gear operation at a time of cornering and others from being effected enabling an improved drive feeling to be maintained.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to an automatic transmission that is capable of automatically changing gear ratios, and in particular selects gears to be used by calculation means according to vehicle speed, accelerator opening, etc. The automatic transmission is designed to mesh selected teeth to obtain a predetermined gear ratio. K PRIOR ART In order to make the most efficient use of the rotational torque of an automobile engine, a transmission has conventionally been attached to the engine. This transmission selects the gear to be used according to the driver's gear change operation, and changes the engine speed to the appropriate gear and transmits it to the drive wheels. However, with conventional transmissions of this type, the driver has to operate the gear shift lever depending on the driving condition of the vehicle, etc. This makes driving operations extremely complicated. In order to overcome these drawbacks, automatic transmissions have been proposed.In this automatic transmission, a calculation means such as a microcomputer selects the most suitable gear according to vehicle speed, accelerator opening, etc., and an actuator selects the most suitable gear. It is a device that meshes gears to automatically obtain a predetermined gear ratio.By equipping a car with such an automatic transmission,
The driver hardly needs to operate a lever to change gears. However, with such an automatic transmission,
Since the gearshift operation is automatically performed according to the vehicle speed and the accelerator opening, the gearshift operation can now be performed even when turning, for example, where conventionally the driver did not consciously shift the gear. If a gear change operation is performed during a turn, a problem occurs in which the engine brake temporarily becomes inoperable.

[Purpose of the invention]

The present invention has been made in view of these problems, and it is an object of the present invention to provide an automatic transmission that prevents automatic gear shifting operations when a vehicle turns. Structure 1 of the K invention The present invention is an automatic system in which a calculation means selects a gear to be used according to vehicle speed, accelerator opening, etc., and an actuator meshes the selected gear to obtain a predetermined gear ratio. The transmission is provided with means for detecting that the difference in the number of rotations between the left and right drive wheels is equal to or greater than a predetermined value, and a means for changing the gear shifting operation of the transmission to M and Ik. The gear shifting operation is prohibited when the difference is greater than a predetermined value. Embodiment] The present invention will be described below with reference to an illustrated embodiment. FIG. 1 shows an automatic transmitter according to an embodiment of the present invention:
This figure shows an automobile engine equipped with three engines, and this engine is composed of a diesel engine 10 for a truck. And this 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 the timer 12.
Moreover, the timing of fuel injection is adjusted by this timer 12. Furthermore, the fuel injection pump 11 is equipped with a mechanical governor 13, and the governor 13 is adapted to adjust the fuel injection angle. 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 (not shown) 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 this clutch. This transmission 15 has an engine 10
The 0 rotation speed is changed to an appropriate value and transmitted to the driving wheels via the propeller shaft 16. The transmission 15 constitutes an automatic transmission, and a shift actuator 17 and a selection actuator 18 are provided above the transmission. Further, a clutch actuator 19 is mounted on the outer surface of the casing of the transmission 15 for controlling connection and disconnection of a clutch mounted on the back side of the flywheel. Furthermore, a fuel control actuator 20 is provided on the front end side of the fuel injection pump 11 to adjust the position of the control rack and control the amount of fuel supplied. These four seven cutout units 17, 18, 19, and 20 are each driven based on instructions from the microcomputer 21 via 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. Roughly speaking, the microcomputer 21 includes a vehicle speed sensor 26,
It is connected to an engine rotation sensor 27, a rack sensor 28, and a crud sensor 29, 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 to the front side of the engine 10 and is configured to detect the rotation speed of the engine 10. Moreover, the rack sensor 28 is attached to the tip side of the actuator 20, and is adapted to detect the position of the control rack of the fuel injection pump 11. 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. Furthermore, the input side of the microcomputer 21 constituting the calculation means of the automatic transmission according to this embodiment has two
The rotation sensors 34 and 35 are respectively connected to the rotation sensors 34 and 35. These rotation sensors 34, 35 are as shown in FIG.
They are provided corresponding to the left and right drive wheels 31 and 32, respectively, and are designed to detect the rotational speed of these drive wheels 31 and 32. Note that these drive wheels 31 and 32 are driven by torque on the output side of the transmission 15 via the propeller shaft 16 and the differential gear device 33. 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 position, the shift operation is automatically performed. There is. 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 17.1.
8. To give an overview of the automatic gear shifting operation, the microcomputer 421 controls the control box 22.
detects whether the position of the gear shift lever 23 is in the automatic position,
In the case of automatic position, the accelerator pedal 2 is pressed at a certain lap w1.
4 are read from the accelerator sensor 25 and heavy speed sensor 26, respectively. 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, gear shifting is not performed. 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. During this shift operation, the actuator 19 switches the clutch to the disengaged state, and synchronizes with the end of the shift operation to reconnect the clutch. Furthermore, according to the automatic transmission according to the present embodiment, the automatic gear shifting operation of the transmission 15 is prohibited when the vehicle is turning. This operation will be explained based on the flowchart shown in FIG. Rimu. Next, the microcomputer 21 calculates the difference in rotational speed between the left and right drive wheels 31 and 32. Then, it is determined whether the difference in rotation speed is greater than a certain value,
A signal for a shift operation is generated only when the difference in rotational speed is less than a certain value, and the shift signal is canceled and a shift operation is prohibited when the difference in rotational speed is more than a certain value. When the vehicle turns, the difference # gear device 33 creates a difference in the rotational speed of the left and right drive wheels 31, 32, so the above operation prohibits the gear change operation when the vehicle turns. That will happen. Therefore, it is possible to prevent the engine brake from being temporarily released due to a gear change operation being performed during a turn. Therefore, it is possible to improve the driving feeling during cornering. Furthermore, the above-mentioned operation prevents a shift operation when one of the drive wheels is idling, so it is also possible to prevent a shift operation when one of the drive wheels is slipping. [Effects of the Invention] As described above, the present invention prohibits the gear shifting operation when the difference between the rotational speeds of the left and right drive wheels is greater than or equal to a predetermined value. According to such a configuration, therefore, the gear change operation is prohibited when turning, and the gear change operation is also prevented when the drive wheels slip.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an automatic transmission according to an embodiment of the present invention, Fig. 2 is a plan view of main parts showing the installation of a rotation sensor of a driving wheel, and Fig. 3 is a block diagram showing an automatic transmission according to an embodiment of the present invention. This is a flowchart. In addition, in the symbols used in the drawings, 15... Transmission 17... Shift actuator 1.8... Select actuator 19... Clarachi actuator 21... Microcomputer 25... Accelerator Sensors 2 to 6... Vehicle speed sensor bar 31... Driving wheel (left) 32... lIl#J wheel (right) 34... Rotation sensor (left) 35... Rotation sensor (right).

Claims (1)

[Claims] In an automatic transmission in which a calculation means selects a gear to be used according to vehicle speed, accelerator opening, etc., and an actuator meshes the selected gear to obtain a predetermined gear ratio, the rotation of the left and right drive wheels is means for detecting that the difference in numbers is greater than or equal to a predetermined value;
An automatic transmission characterized in that the automatic transmission is provided with a means for prohibiting a gear shifting operation of the transmission, and the gear shifting operation is prohibited when a difference in rotational speed between left and right drive wheels is equal to or greater than a predetermined value.