JPS62199532A - Automatic transmission - Google Patents

Abstract

PURPOSE:To prevent a vehicle from inadvertently rushing out, by providing such an arrangement that an accelerator pedal is depressed in a condition in which the pressure of air fed into an actuator is lower than an operating pressure, and the vehicle is inhibited from starting in this condition even if the pressure of air increases up to the operating operation. CONSTITUTION:When an automatic transmission 15 starts a vehicle, a microcomputer 21 reads at first the shift position of the transmission, and then reads the pressure in the air tank 33 by means of a pressure sensor 37 when the shift position is other than the neutral position. When the pressure in the air tank 33 is less than an operating pressure, a compressor 31 is driven by an engine 10 to accumulate air in the tank 33. Then, the microcomputer 21 detects the degree of depression of the accelerator pedal 24 by means of an accelerator sensor 25. When an accelerator pedal 24 is depressed again after it is once returned, solenoid valves 34 through 36 are opened to feed air into actuators 17 through 19 to carry out shift operation and engagement of the clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to automatic transmissions, and in particular calculates a proper gear position and automatically adjusts the gear position by an actuator to the value obtained by this calculation. Regarding the automatic transmission that was changed.

KSummary of the Invention The present invention provides an automatic transmission that automatically changes gears to a proper gear position, in which the accelerator is operated when the pressure of the air supply source supplied to the air actuator is below the operating pressure. When the accelerator pedal is depressed, even if the pressure of the air supply source exceeds the operating pressure in this state, the start operation is prohibited, and when the accelerator pedal is released and then depressed again, the The starting operation is performed only at the same time.

K. PRIOR ART Automatic transmissions have been proposed to omit frequent 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.

[Problems to be Solved by the Invention] When changing gears using such an automatic transmission, air actuators are used for each shift operation and clutch engagement/disengagement. On the other hand, the vehicle starts in conjunction with depression of the accelerator pedal.

Therefore, when the pressure of the air supply source of the air actuator is low, if you switch the gear shift lever to a position other than neutral and press the accelerator pedal when the vehicle is stopped, the shift operation will not be performed immediately and air will accumulate in the engine. As a result, the shift operation is performed in a state where the pressure of the air supply source reaches the operating pressure. In other words, there is a possibility that the shift operation will be performed at an unexpected timing and the vehicle will start moving.

The present invention has been made in view of these problems, and the present invention is designed to prevent air pressure from being activated after the accelerator pedal is depressed when the pressure of the air supply source supplied to the air actuator is lower than the operating pressure. It is an object of the present invention to provide an automatic transmission that prohibits the vehicle from starting even when the pressure reaches the maximum pressure.

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 such a transmission, the actuator that performs a speed change operation or the actuator that switches engagement and disengagement of a clutch is composed of an air actuator, and when the pressure of the air source supplied to the air actuator is below the operating pressure, the accelerator pedal is pressed. As it is stepped into,
In this state, a means for prohibiting the start even if the pressure of the air supply source exceeds the operating pressure is provided, so that the start operation is performed when the accelerator pedal is once released and then depressed again. It is something.

Therefore, according to the present invention, even if the accelerator pedal is depressed while the pressure of the air supply source supplied to the actuator is below the operating pressure, and the air pressure subsequently exceeds the operating pressure, the above prohibition will not occur. The vehicle is prohibited from starting. Then, after the -H accelerator pedal is released, the accelerator pedal is depressed again, and the starting operation is performed.

K 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. Roughly speaking, the fuel injection pump 11 is equipped with a mechanical governor 13, and the governor 13 is adapted to adjust the amount of fuel to be 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 power 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 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 4
The three actuators 17, 18, 19, and 20 are each driven based on instructions from the microcomputer 21 via driving means.

The actuators 17, 18 for changing the speed of the transmission 15 and the actuator 19 for controlling the engagement and disengagement of the clutch 30 are both constituted by air actuators, and these actuators are connected to an air tank through electromagnetic valves 34, 35, 36, respectively. It is designed to be connected to 33. And this air tank 3
3 is connected to a compressor 31. The compressor 31 is configured to be transmitted to the engine 10 through a belt 32, and is driven using part of the output of the engine 10. and electromagnetic valve 34.
35 and 36 are controlled to open and close according to control signals from the microcomputer 21, respectively. The air tank 33 is also equipped with a pressure sensor 37, and the output of this sensor 37 is input to the microcomputer 21.

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, and a clutch 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 the rack sensor 28 is attached to the tip side of the actuator 20.
The position of the control rack No. 1 is detected. Further, the clutch sensor 29 is attached to the tip side of the clutch actuator 19, and the clutch sensor 29
The state of connection and disconnection of 0 is detected.

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 operation of automatic gear shifting, the microcomputer 21 detects whether the gear shift lever 23 of the control box 22 is in the automatic position, and if it is in the automatic position, the accelerator pedal 24 is depressed at regular intervals. The amount or accelerator opening degree and vehicle speed are read from the accelerator sensor 25 and vehicle speed sensor 26, respectively. Roughly, the microcomputer 21 reads the map stored in its memory, and based on this map,
Performs calculations to determine 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. 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.

When the automatic transmission that performs the speed change operation as described above performs a starting operation, the operation as shown in FIG. 3 is performed.

The microcomputer 21 reads the shift position of the transmission 15 using a shift sensor (not shown), and also determines whether the transmission 15 is in a neutral state. If the transmission is not in neutral, the pressure in the air tank 33 is read from the output of the pressure sensor 37. Then, it is determined whether the air pressure in the air tank 33 is higher than the operating pressure. When the pressure in the air tank 33 is equal to or higher than the operating pressure, the accelerator sensor 25 detects depression of the accelerator pedal 24. When it is detected that the accelerator pedal 24 has been depressed, the microcomputer 21 responds to this by controlling the M magnetic valve 34.
35, 36 respectively, actuators 17.1
8.19 will be used to perform the starting operation. As a result, a normal starting operation is performed.

Next, if it is determined that the pressure inside the air tank 33 is below the operating pressure, the actuator 17.18 is immediately activated.
．． Engine 10 is unable to drive engine 19.
The compressor 31 is driven by the compressor 31, and compressed air is stored in the air tank 33.

Once air has been stored in the air tank 33 to the operating pressure, the microcomputer 21 detects the amount of depression of the accelerator pedal 24 using the accelerator sensor 25.
It is determined whether the accelerator pedal 24 has been released. When the accelerator pedal 24 is once released, the accelerator sensor 25 detects whether the accelerator pedal 24 has been depressed again. When the accelerator pedal 24 is depressed again, the starting operation is performed for the first time at this point, and the electromagnetic valve 34.3
5.36 is opened to perform a shift operation by actuators 17 and 18, and the clutch is connected by actuator 19 to start the vehicle.

Therefore, according to such an automatic transmission, it becomes possible to detect that the pressure is below the operating pressure by the pressure sensor 37 provided in the air tank 33. If the pressure inside the air tank 33 is below the operating pressure,
As is clear from FIG. 3, even if the accelerator pedal 24 is depressed, no starting operation is performed. During this period, the driver depresses the accelerator pedal 24 to increase the rotation speed of the engine 10, and the compressor 31 supplies compressed air to the tank 3.
It will be stored in 3. Even if the accelerator pedal 24 is still depressed after this, the accelerator pedal 2
The starting operation will not be performed unless 4 is returned once. That is, a starting operation is performed only when the accelerator pedal is once released and then depressed again with the intention of starting. Therefore, with such an automatic transmission, it is possible to prevent the vehicle from accidentally jumping out due to an increase in the pressure inside the air tank 33.

[Effects of the Invention] As described above, in the present invention, when the accelerator pedal is depressed in a state where the pressure of the air supply source supplied to the actuator is below the operating pressure, and in this state, the air pressure is above the operating pressure. The system prohibits the vehicle from starting even if the vehicle reaches the point in time, and the vehicle starts only when the accelerator pedal is pressed again after the accelerator pedal has been released. Therefore, an automatic transmission capable of starting the vehicle in accordance with the driver's will is provided.

[Brief explanation 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 invention, and FIG. 3 is a flowchart showing a starting operation by this automatic transmission. In the symbols used in the drawings, 15... Transmission 17... Shift actuator 18... Select actuator 19... Clutch actuator 21... Microcomputer 24... Accelerator pedal 25... Accelerator Sensor 26...vehicle speed sensor 30...clutch 31...compressor 33...air tank. Figure 1

Claims (1)

[Claims] In a transmission that calculates the appropriate gear position and automatically changes the gear position using an actuator to reach the value obtained by this calculation, the actuator that performs the gear shifting operation or the actuator that switches the engagement and disengagement of the clutch is used. The accelerator pedal is depressed when the pressure of the air supply source supplied to the air actuator is below the operating pressure, and in this state the pressure of the air supply source becomes above the operating pressure. An automatic transmission characterized in that the automatic transmission is provided with a means for prohibiting the start even if the accelerator pedal is released, and the start operation is performed when the accelerator pedal is once released and then the accelerator pedal is depressed again.