JPS61129328A - Automatic transmission - Google Patents

Abstract

PURPOSE:To get smooth starting of a vehicle on a slope without backward slipping by providing means for detecting the torque required to keep the vehicle stopping and means for controlling the slippage of a clutch. CONSTITUTION:A microcomputer which constitutes an arithmetic unit of an automatic transmission is connected at the input side to a pressure sensor 31 for detecting the pressure of a brake cylinder 30 of a service brake. The microcomputer 21 is further connected at the input side to a torque sensor 32, which is mounted between the tire of a driving wheel and the brake drum or disc thereof and is adapted for measuring the amount of torque required to stop the vehicle when the service brake is operated. And, if the foot is removed from the brake pedal, the clutch is slipped to keep the vehicle stopping.

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to an automatic transmission that automatically changes the gear ratio to 1n.In particular, the present invention relates to an automatic transmission that automatically changes the gear ratio to 1n. This invention relates to an automatic 1-run transmission that meshes selected gears to obtain a predetermined gear ratio. K PRIOR ART In order to change the rotational speed of an automobile engine to an appropriate value, a transmission has conventionally been attached to the engine. In this transmission, the gear to be used is selected in response to the driver's gear change operation, and the engine speed is changed to an appropriate value and transmitted to the drive wheels. However, with such a conventional transmission, the driver has to operate the gear shift lever depending on the driving condition of the vehicle, etc., which makes driving operations extremely complicated. Automatic transmissions have been proposed to overcome these drawbacks. In this automatic transmission, a calculation means such as a microcomputer selects the gear to be used depending on the vehicle speed, accelerator opening, etc., and an actuator meshes the selected gear 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. However, vehicles equipped with such automatic transmissions have difficulty starting on hills. Generally, in order to start on a hill, the clutch is first slipped to balance the gravitational acceleration applied to the vehicle and the torque applied to the drive wheels, and in this state the accelerator pedal is depressed to start the vehicle. However, automatic transmissions cannot perform this delicate half-clutch operation, making it impossible to smoothly start on a slope.

[Purpose of the invention]

The present invention was made in view of these problems, and an object of the present invention is to provide an automatic transmission that controls the slip brass of the clutch and enables smooth hill starts. It is something to do. Structure of the Invention) The present invention selects a gear to be used in (-) by a calculating means according to medium speed, accelerator opening, etc., and meshes the selected gear by an actuator to obtain a predetermined gear ratio. The automatic transmission is provided with means for detecting the torque necessary for maintaining the vehicle in a stopped state, and means for controlling the slip suspension of Kra Sochi, and wherein the torque detected by the means for detecting the torque is provided. This relates to an automatic transmission characterized in that the vehicle is maintained in a stopped state by slipping a clutch so that torque is generated, and the vehicle is maintained in a stopped state by slipping the clutch in this manner. This makes it easy to start on a slope. Embodiment] The present invention will be described below with reference to an illustrated embodiment. FIG. 1 shows an engine for an automobile 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 a mechanical governor 13, and the governor 13 is adapted to adjust the fuel injection level. 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 rotational speed of the engine is changed to an appropriate value and transmitted to the driving VJ 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. A clutch actuator 19 is mounted on the outer surface of the casing of the transmission 15 for controlling the connection and disconnection of a clutch that is mounted roughly on the back side of the flywheel. Further, 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 supply of fuel. These four actuators 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. 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, an engine rotation sensor 27 is attached to the front side of the engine 10, and is adapted to detect the rotation speed of the engine 10.A rack sensor 28 is attached to the tip side of the actuator 20, It is designed to detect the position of the control rack of the fuel injection pump 11.A clutch sensor 29 is attached to the tip side of the clutch actuator 19, and is designed to detect the engagement and disengagement state of the clutch. Roughly speaking, the input side of the microcomputer 21 constituting the calculation means of the automatic transmission according to this embodiment is connected to a pressure sensor 31 that detects the pressure in the brake cylinder 30 of the service brake.
1 is designed to generate a detection output when the brake pedal is depressed and the pressure in the cylinder 30 increases,
It constitutes a brake sensor. Roughly speaking, a torque sensor 32 is connected to the input side of the microcomputer 21. The torque sensor 32 is installed between the tire of the drive wheel and the brake drum or disc, and when the service brake is activated,
I am trying to measure the amount of torque required to stop the motor. 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. Furthermore, 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. During this shift operation, the actuator 19 switches the clutch to the disconnected state, and at the same time synchronizes with the end of the shift operation, the clutch is brought into the connected state again. Further, according to the automatic transmission according to the present embodiment, the vehicle can be maintained in a stopped state even on a sloped road surface such as a slope without depressing the brake pedal. This operation involves measuring the torque required to stop the septum using the torque sensor 32 when the service brake is activated, and holding the clutch in a slip state so that the actuator 19 generates the above torque. This is achieved by the following and is operated based on the flowchart shown in FIG. First, the microcomputer 21 uses the brake sensor 31 to detect whether the service brake is maintained in an operating state for a certain period of time, for example, two seconds or more. If the operating time of the service brake is longer than a certain value, the torque sensor 32 reads the amount of torque required for the service brake to stop the vehicle. When the brake pedal is released, the clutch is slipped to maintain the vehicle stopped. That is, the microphone computer 21 determines whether the sensed torque is forward or backward, and in the case of backward, sets the gear of the transmission 15 to the forward side,
In addition, in the case of forward movement, the gear of the transmission 15 is set to reverse. This movement is accomplished by actuators 17.18. After this, the clutch 7 actuator 19 takes over the clutch until the sensed torque shown in E is generated, and the operation of the actuator 19 is stopped in a half-clutch state where the torques match, and this state is maintained. Make it. Therefore, the vehicle is maintained in a stopped state by the torque applied to the drive wheels by this half-clutch. This ρ state will continue until the next time the accelerator pedal is depressed, and the vehicle will maintain its stopped state. As described above, according to the automatic transmission according to this embodiment, when the brake pedal is released after being depressed for a certain period of time, the same torque as that used to maintain the vehicle in a stopped state by the service brake is generated. , caused by slipping the clutch,
This torque makes it possible to maintain the vehicle at a standstill. Since the vehicle can be maintained in a stopped state with the clutch slipped in this way, it is possible to start on a slope easily and immediately by depressing the accelerator pedal. There is no need to operate other pedals or other pedals at all. Therefore, with such a configuration, an automatic transmission that can smoothly start the vehicle on a slope can be obtained. Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made based on the technical idea of the present invention. For example, the torque sensor 32 in the above embodiment is designed to detect the torque that maintains the vehicle in a stopped state when the service brake is activated, but instead of this configuration, it is possible to detect the torque that maintains the vehicle in a stopped state when the parking brake is activated. The torque that maintains the vehicle in a stopped state may be detected when the vehicle is stopped. In this case, a torque sensor may be provided between the drive wheels and the propeller shaft. K Structure of the Invention As described above, the present invention detects the torque necessary to keep the vehicle in a stopped state, and also maintains the vehicle in the stopped state by slipping the clutch so that this torque is generated. This is what I did. Therefore, it is possible to start on a slope by depressing the accelerator pedal in this stopped state, and the vehicle can start smoothly without moving backwards when starting on a slope.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an automatic transmission according to an embodiment of the present invention, and FIG. 2 is a flow chart showing the creep operation of this automatic transmission. In the symbols used in the drawings, 15...Transmission 17...Shift actuator 18...One select actuator...Clutch actuator 21...Microcomputer 25...Accelerator sensor 26... -Vehicle speed sensor 31...brake sensor 32...1 - Lux sensor.

Claims (1)

[Claims] An automatic transmission in which a calculation means selects a gear to be used according to vehicle speed, accelerator opening, etc., and an actuator engages the selected gear to obtain a predetermined gear ratio, and the vehicle maintains a stopped state. means for detecting the torque necessary to detect the torque and a means for controlling the slip amount of the clutch, the clutch is slipped so that the torque detected by the torque detecting means is generated, and the vehicle is stopped. An automatic transmission characterized in that it maintains.