JPH0623544B2 - Automatic transmission - Google Patents

Description

The present invention relates to an automatic transmission, and particularly to calculating a proper gear position, and automatically using an actuator so as to obtain a value obtained by this calculation. The present invention relates to an automatic transmission that changes gear positions.

[Outline of Invention]

The present invention, in an automatic transmission that automatically shifts gears to a proper gear position, increases the amount of fuel supplied to the engine by a fuel injection pump at the time of starting and keeps the engine speed at a predetermined level. When the number of revolutions is reached, pull back the control rack,
This prevents the engine from rising when the vehicle starts.

[Conventional technology]

An automatic transmission has been proposed in order to save the driver from frequently changing gears. 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.

[Problems to be solved by the invention]

When the vehicle equipped with such an automatic transmission starts, the driver may depress the accelerator pedal. As a result, the amount of fuel supplied to the engine is increased, and the clutch is engaged so that the vehicle is started at a gear ratio that allows the vehicle to start. However, both the clutch connection and the increase in the amount of fuel supplied to the engine are performed by the actuator based on the instruction of the microcomputer, and therefore, for example, when the accelerator pedal is suddenly depressed at the time of starting, the amount of fuel increases. As a result, the surplus torque causes the engine to blow up.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an automatic transmission that prevents the engine from blowing up when starting a vehicle equipped with the automatic transmission. .

[Means for solving problems]

The present invention is generated by depressing the accelerator pedal when the vehicle is stopped in a transmission in which the gear position is settled and the gear position is automatically changed by the actuator so as to obtain the value obtained by this calculation. A means for moving the control rack of the fuel injection pump to the increasing side when there is a start signal, a connecting means for connecting the clutch when there is the start signal, and a rotation speed of the engine during the connecting operation by the connecting means. Detecting means for detecting, comparing means for comparing the number of revolutions of the engine with a predetermined number of revolutions, means for pulling back the control rack of the fuel injection pump, and means for moving the control rack to the amount increasing side when starting Increase the amount of fuel that the fuel injection pump supplies to the engine. In addition, when the comparison means detects that the engine speed reaches a predetermined speed, the pullback means pulls back the control rack, and the engine speed becomes the predetermined speed according to the governor characteristics of the fuel injection pump. The present invention relates to an automatic transmission characterized by being gradually increased from the number.

[Action]

Therefore, when the accelerator pedal is depressed when the vehicle is stopped, a start signal is generated, the control rack of the fuel injection pump is moved to the increasing side in response to this start signal, and the connecting means performs the connecting operation of the clutch. The rotational speed of the engine is detected by the detecting means during the connecting operation by the connecting means, and the rotational speed is compared with a predetermined rotational speed set in advance by the comparing means. When the rotation speed reaches the predetermined rotation speed, the pullback means pulls back the control rack, and the rotation speed of the engine is controlled so as to gradually increase from the predetermined rotation speed in accordance with the governor characteristics of the fuel injection pump.

〔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 a truck. The diesel engine 10 is equipped with a fuel injection pump 11, and the engine 11 is driven by the pump 11.
Fuel is sequentially supplied to each of the cylinders.
The fuel injection pump 11 is connected to the engine 10 via the timer 12.
The timer 12 adjusts the timing of fuel injection. Further, the fuel injection pump 11 is provided with a mechanical governor 13, and the governor 13 adjusts the fuel injection amount.

The flywheel housing 1 is on the rear side of the engine 10.
4 is provided, and a flywheel fixed to the end of the crankshaft is housed in the housing 14. A clutch 30 is provided on the rear side of the flywheel, and a transmission 15 is mounted on the rear side of the flywheel housing 14 so as to be connected to the clutch 30. This transmission 15 is the engine 1
Change the rotation speed of 0 to a predetermined value, and
It is adapted to be transmitted to the drive wheels via.

The transmission 15 constitutes an automatic transmission, and a shift actuator 17 and a select actuator 18 are provided on the upper portion thereof. Further, the clutch actuator 19 for controlling connection and disconnection of the clutch 30 mounted on the rear side of the flywheel is provided by the transmission 1
5 is mounted on the outer surface of the casing. Further, on the front end side of the fuel injection pump 11, there is provided a fuel control actuator 20 for adjusting the position of the control rack to control the fuel supply amount. These 4
The two actuators 17, 18, 19, 20 are driven based on the illustration of the microcomputer 21 via driving means.

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 that detects the accelerator opening or the depression amount 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 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 tip end side of the actuator 20, and the fuel injection pump 1
The position of the control rack No. 1 is detected. The clutch sensor 29 is attached to the tip end side of the clutch actuator 19, and the clutch 3
It is designed to detect 0 connection and disconnection states.

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 position, the speed change operation is automatically performed. There is. On the other hand, when the shift lever 23 is at the manual position, the manually selected shift operation is performed by the actuators 17, 1
8 is performed.

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 position, and in the case of the automatic position, the accelerator pedal 24 is depressed at a constant cycle. The amount 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 the map stored in the memory, and based on this map,
Calculates whether automatic gear shifting is possible. 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 automatic shifting is performed by the microcomputer 21.
On the basis of the command from the above, via a drive means (not shown), the shift actuator 17 and the select actuator 18
Is operated so that the gears of the transmission 15 are selected, so that the meshing of the selected gears of the transmission 15 is achieved. Therefore, a predetermined gear ratio can be obtained in this way. During this shifting operation, the clutch 30 is temporarily switched to the disengaged state by the actuator 19, and the clutch 30 is brought into the engaged state again in synchronization with the end of the shifting operation.

When a vehicle equipped with the transmission 15 that performs such automatic gear shifting performs a starting operation, the accelerator pedal 24 is depressed. By depressing the accelerator pedal 24, the starting operation is performed based on the flowchart shown in FIG. That is, the microcomputer 24 detects the presence or absence of the start signal based on the detection output of the accelerator sensor 25, and drives the fuel control actuator 20 of the fuel injection pump 11 when the start signal is present. Then, the actuator 20 allows the control rack to be pulled toward the increasing amount side, which increases the amount of fuel supplied to the engine 10. In this way, the torque of the engine 10 at the time of starting is increased to prevent engine stall. And at the same time as this, the microcomputer 21
The actuator 19 connects the clutch 30 to start the starting operation.

In the course of this starting operation, the microcomputer 21 reads the rotation speed of the engine 10 by the rotation detection sensor 27, and determines whether or not the value of this rotation speed exceeds the rotation speed corresponding to point A in FIG. Do. When the rotation speed of the engine 10 exceeds the rotation speed at the point A, it is determined that there is excess torque, and at this time, the fuel control actuator 20 is used to pull back the control rack to the reduction side. Therefore, the point A moves on the locus shown by the dotted line in FIG.
That is, the governor characteristic of the fuel injection pump 11 is utilized to gradually increase the rotational speed from the rotational speed at the point A while pulling back the control rack. Therefore, the amount of fuel that the fuel injection pump 11 supplies to the engine 10 is reduced, and when the number of revolutions of the engine 10 rises above a predetermined number of revolutions, the engine torque exceeds the required torque
Will not occur.

As described above, according to the vehicle equipped with the automatic transmission according to the present embodiment, the accelerator pedal 24
Even if the engine is abruptly stepped on, if the rotation speed of the engine 10 exceeds the rotation speed at which an excessive torque is generated, the control rack is pulled back to suppress the fuel injection amount of the fuel injection pump 11. Therefore, from this fact, the engine 10 is controlled so as not to generate torque more than necessary at a certain speed or more, and the engine 10 does not blow up. In addition, a shock will not be generated due to excessive torque of the engine 10 at the time of starting.
Therefore, with such a configuration, it is possible to provide a vehicle that enables a smooth start.

〔The invention's effect〕

As described above, the present invention connects the means for moving the control rack of the fuel injection pump to the increasing side when there is a start signal generated by the depression of the accelerator pedal when the vehicle is stopped, and the clutch when there is the start signal. Connecting means, detecting means for detecting the engine speed during the connecting operation by the connecting means, comparing means for comparing the engine speed with a predetermined speed, and means for pulling back the control rack of the fuel injection pump. The fuel injection pump increases the amount of fuel supplied to the engine by means for moving the control rack to the increasing side at the time of starting, and the comparison means detects that the engine speed has reached a predetermined speed. The control rack is pulled back by the pulling back means, and the engine speed is adjusted to cover the fuel injection pump. It is obtained so as to increase gradually from a predetermined rotational speed according to the characteristic.

Therefore, according to such a configuration, even if the accelerator pedal is suddenly and strongly depressed at the time of starting, when the engine speed reaches a predetermined speed, the control rack of the fuel injection pump is pulled back to rotate the engine speed. Is controlled to gradually increase from a predetermined rotation speed according to the governor characteristics of the fuel injection pump. Therefore, even if the accelerator pedal is suddenly and strongly depressed, the engine will not blow up, and a smooth starting operation can be achieved.

Such a control operation is achieved only by detecting the engine speed without detecting the clutch engagement stroke. Since the engine speed depends on the clutch engagement stroke, the start control can be performed very effectively by using only the information about the engine speed.

[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 flowchart showing a starting operation of a vehicle equipped with this automatic transmission. FIG. 4 is a graph showing an operation for a starting operation. In the drawings, reference numerals 10 ... Diesel engine 11 ... Fuel injection pump 15 ... Transmission 17 ... Shift actuator 18 ... Select actuator 20 ... Fuel control actuator 21 ... Microcomputer 24 ... Accelerator pedal 25 ... Accelerator sensor 26 ... Vehicle speed sensor 27 ... Engine rotation sensor.

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 the value obtained by this calculation, which is generated by depressing an accelerator pedal when the vehicle is stopped. Means for moving the control rack of the fuel injection pump to the increasing side when there is a start signal, connection means for connecting the clutch when there is the start signal, and engine speed during connection operation by the connection means. A detecting means for detecting the engine speed, a comparing means for comparing the engine speed with a predetermined engine speed, and a means for pulling back the control rack of the fuel injection pump, and moving the control rack to the increasing side when starting. The amount of fuel supplied by the fuel injection pump to the engine by means of The control rack is pulled back by the pullback means when the comparison means detects that the engine speed has reached a predetermined rotation speed, and the engine speed is set to the predetermined value according to the governor characteristics of the fuel injection pump. An automatic transmission characterized by gradually increasing from the number of revolutions.