JP2603265Y2 - Automatic transmission for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an improvement in an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art In recent years, in order to reduce the burden on the driver, vehicles that automatically perform a shift operation by interposing a torque converter between an engine and a transmission have increased. Since the coupling is used, the transmission efficiency of the output is inevitably lower than that of the mechanical clutch, which is disadvantageous in terms of improving fuel efficiency.

[0003] In order to improve fuel economy as well as ease of operation, a conventional gear transmission and a mechanical clutch are used, and the driver does not operate the clutch and the transmission, but the electronic control of the control unit automatically controls the operation. The present applicant has proposed a system in which the gearshift operation is performed in a controlled manner (Japanese Utility Model Application Laid-Open No. 60-13994).
No. 8).

In this case, when the selector in the operator's cab is set to the auto range, an optimum target shift stage is obtained from the shift map data stored in the memory in the control unit based on the engine operating state and the vehicle speed. Various actuators are controlled in order to perform a speed change operation. That is, when the target shift speed does not match the actual shift speed and a shift request is issued, the control lever of the engine fuel injection pump is first returned to the no-load position because the transmission has no synchronization mechanism. Thereafter, when a predetermined time has elapsed, the clutch is disengaged, the transmission is set to the neutral position, and the clutch is disengaged at the same time.

A rotation range (synchro region) in which the rotation of the main gear (counter shaft rotation) that idles the main shaft can be synchronized with the rotation speed of the main shaft connected to the axle without generating gear noise or the like.
When the vehicle enters, the gear set operation for engaging the main gear and the main shaft is started, and the control lever is returned to the original position after the gear setting is completed.

The selector in the cab has a shift range corresponding to the shift stage of the transmission in addition to the auto range, and a shift request is also generated by switching these ranges.

[0007]

By the way, in such a conventional device, a complicated program is required to automatically control even a delicate clutch operation at the time of starting of the vehicle. Intermittent operation can be performed manually, but with the electronic control described above, even if a shift request is issued while the clutch pedal is depressed during traveling, the clutch is disengaged, so the engine rotation is synchronized. Therefore, there is a problem that the gear shifting operation cannot be performed because the gear shifting operation is not possible. Similarly, if the clutch pedal is depressed during the automatic shift control, the clutch is also disengaged and the synchro control cannot be performed, so that the shift control cannot be completed.

[0008]

According to a first aspect of the present invention, a gear change is required.
Request, the engine is returned to the accelerator fully closed position,
Disengage latch and neutralize transmission.
Position, then connect the clutch and engine
Transmission rotation is controlled synchronously
When the input rotation enters the specified synchronization area
Change the vehicle so that the required gear is
In the automatic transmission of a vehicle including a means for controlling the speed operation, the synchronizing mechanism is provided to the transmission, the operation
While adding a clutch pedal to the room,
The clutch is switched on and off according to the automatic transmission control described above.
Drive circuit and clutch for automatic control with a switch valve
Drives the clutch in the intermittent direction according to the pedal operation amount
Drive circuit for manual control via double check valve
While they are installed in parallel, they turn on when the clutch pedal is depressed.
Pedal switch and when this switch is on
When a shift request is issued, the automatic shift control is replaced with a clutch.
While holding the latch valve on the clutch connection side,
Means for performing backup control so that the gear is set to the required shift stage after the transmission is set to the neutral position, and alarm means that is activated when the gear shift is completed.

In the second invention, when a shift request occurs, an error occurs.
Return the engine to the accelerator fully closed position, disengage the clutch
Set transmission to neutral position from
And then connect the clutch to sink engine speed.
Control the output rotation of the transmission.
When the input rotation enters the predetermined synchronization region, the required shift stage
Control the gear shifting operation of the vehicle so that
In an automatic transmission for a vehicle provided with means for transmitting a vehicle, a synchronizing mechanism is provided in the transmission, and a clutch
While adding a dull, the clutch
Via the clutch valve that is interrupted according to the automatic transmission control described above.
Drive circuit for automatic control and clutch pedal operation amount
Drive for manual control that drives the clutch in the
A dynamic circuit is provided in parallel via a double check valve.
The pedal switch that turns on when the clutch pedal is depressed
And this switch is turned on during the automatic shift control.
Return the transmission to the neutral position
And then switch the clutch valve to the clutch connection side
Or the automatic transmission control is backed up so that the gearshift to the required shift stage is performed while keeping the clutch connected.
Means for control, and alarm means which operate during gear shifting completion, the provision.

[0010]

[Action] Oite the first invention, when the speed change request when the clutch pedal is in the ON state occurs, work is backup control unit, the clutch driving system after setting the transmission to the neutral position Manual while maintaining the operating state, to perform a gear set to the required shift stage, since the meshing rapid synchronization of the gear mutual at transmission of synchronous mechanisms regardless of the synchronous control of the engine rotation is carried out, varying based on shift request <br/> Speed operation becomes possible.

[0011] Oite the second invention, when the clutch pedal is stepped on in the control of the automatic transmission, acts a backup control unit, once the manual operation of the clutch of the drive system from the back to the neutral position transmissions while maintaining the state, executes the gear set to the required shift stage, since the engagement rapid synchronization of the gear mutually in synchronizing mechanism of the transmission is performed in the same manner as the first invention, the shift operation based on the shift request Perform
It is possible that.

Therefore, in any case, the driver only has to depress the clutch pedal and release the clutch pedal after waiting for a warning at the completion of the shift. In other words, the driver can flexibly and manually operate the clutch according to the driving conditions.

[0013]

FIG. 1 is a schematic diagram showing an example of application to a diesel engine vehicle. In this embodiment, a fuel injection pump 1, a mechanical clutch 2, and a gear transmission 3 detect various types of detecting means for detecting the operating states thereof. And an actuator for driving them, and a control unit 4 composed of a microcomputer controls the actuator based on signals from these detecting means to realize automatic shifting. The transmission 3 employs a synchronizing mechanism so that the transmission can be shifted even during manual operation of the clutch 2.

First, means for detecting an operating state is required as detecting means. This operating state includes a load state of the engine 6, a range position of the selector 7, an on / off state of the clutch 2,
It can be determined from the actual shift position of the transmission 3 and the vehicle speed. Therefore, a load sensor (not shown) for detecting the load state of the engine from the angular position of the control lever is provided in the fuel injection pump 1 of the engine.
The selector 7 has a range position sensor 9 for detecting the range position of the select lever 8, and the clutch 2 has a clutch stroke sensor 11 for detecting the engaged / disengaged state of the clutch 2 based on the angular position of the outer lever 10.
A shift position sensor 12 for detecting an actual shift position.
A main shaft rotation sensor 13 (which functions as a vehicle speed sensor) for detecting the rotation speed of the main shaft, and a counter shaft rotation sensor 14 for detecting the rotation speed of the counter shaft. Reference numeral 15 denotes a pedal switch that is turned on when a clutch pedal 16 described later is depressed.

Next, as an actuator to be controlled by the control unit 4 for these detecting means,
The fuel injection pump 1 has a governor control device 17 that drives a control lever as required, and controls the engine rotation to match the required rotation. The clutch 2 has a clutch actuator 18 that connects and disconnects the same, and the transmission 3 Is provided with a gear shift actuator 19 for driving a gear shift mechanism.

In the cab, there are provided an accelerator petal 40 for controlling the injection amount of the fuel injection pump 1, a clutch pedal 16 for manually operating the clutch actuator 18, and an alarm buzzer 41 which is activated when the shift of the transmission 3 is completed. Provided.

FIG. 2 shows a specific structure of the clutch actuator 18. Reference numeral 20 denotes a clutch booster for connecting and disconnecting the clutch 2 via the outer lever 10, reference numeral 21 denotes a master cylinder of the clutch pedal 16, and reference numeral 22 denotes an oil of the master cylinder 21. When the clutch pedal 16 is depressed, the relay piston 23 is pressed by the hydraulic pressure from the master cylinder 21 to communicate the air reservoir side of the manual air circuit 24 with the clutch booster 20 side. This allows
Air pressure is supplied from the air reservoir to the clutch booster 20 through the double check valve 25, and the piston rod 26 is extended by the assist force to disconnect the clutch 2.

When the clutch pedal 18 is released, the oil pressure in the clutch booster 20 is returned to the master cylinder 21, whereby the relay piston 23 shuts off the air reservoir side of the air circuit 24 by the return spring and simultaneously opens the exhaust port of the clutch booster 20. . Therefore, the piston rod 26 contracts while discharging the air pressure inside the booster 20 to connect the clutch 2.

An automatic air circuit 27 is connected to the clutch booster 20 via a double check valve 25 in parallel with a manual air circuit 24. The automatic booster circuit 20 selectively controls air pressure and atmospheric pressure by a control signal from the control unit 4. An electromagnetic valve 28 (clutch valve) to be supplied to the side 20 is provided.

Then, the control unit 4 issues a shift request based on the engine load and the vehicle speed during the auto range running,
Alternatively, when a shift request is generated according to the range switching operation of the selector 7, the control of the governor control device 17, the clutch booster 20, and the gear shift actuator 19 is controlled as necessary. That is, when a shift request is generated while the clutch pedal switch 15 is in the off state, the governor control device 17 is first driven to start the engine fuel injection pump 1 as shown in FIG.
Is returned to the accelerator fully closed position, and after a predetermined time has elapsed, the clutch valve 28 is turned on (1.01 to 1.03). Thus, the clutch booster 20 drives the clutch 2 in the disengagement direction. When the clutch 2 reaches a predetermined stroke (for example, 65%) position, the shift position of the transmission 3 is returned to the neutral position, and the shift to the required shift stage is selected. The drive of the gear shift actuator 19 (shift valve and select valve not shown) is controlled so as to perform the operation (1.04 to 1.08). Thereafter, the clutch 2 is engaged by turning off the clutch valve 28 (1.09).

The rotation speed NG (counter shaft rotation) of the main gear that idles the main shaft is NG <
When N + N4 is reached, NG is determined to be in the synchro region, and a gear set for engaging the main gear with the main shaft is started. After the gear setting is completed, the accelerator position of the fuel injection pump 1 is returned to the original position, and the alarm buzzer 4
1 is operated for a predetermined time, and the operating pressure of the gear shift actuator 19 is released to the atmosphere (1.10 to 1.16).
If the gear setting is not completed, the engine speed is once increased to NG> N + N4 by fully opening the accelerator, and the operation is repeated from the synchro judgment again when the accelerator is fully closed (1.17 to 1.20).

On the other hand, when a shift request is made while the clutch pedal switch 15 is on, the clutch valve 28 is turned off, that is, the clutch 2 is held in a manual operation state as shown in FIG. 4 (2.01). Then, immediately after returning the shift position of the transmission 3 to neutral,
The drive of the gear shift actuator 19 (shift valve and select valve, not shown) is controlled so as to perform the select operation to the required shift stage (2.02 to 2.0).
5).

When the shift position of the transmission 3 is in the neutral state, a gear set for engaging the main gear and the main shaft is started. As a result, the synchronizing mechanism of the transmission 3 promptly meshes the gears with each other. When the gear setting is completed, the alarm buzzer 41 is operated and the operating pressure of the gear shift actuator 19 is released to the atmosphere (2.0
6-2.10).

As described above, during the speed change control with the clutch pedal 16 released, the synchronizing control of the engine rotation is performed as before, but when the speed change control is performed with the clutch pedal 16 depressed, the engine speed synchronizing control is performed. Since the control is omitted and the gears are engaged with each other by the synchronizing mechanism of the transmission 3, the gearshift control is not disabled even if the clutch 2 is manually operated during traveling.

Therefore, the driver can depress the clutch pedal 16 as necessary, and release the clutch pedal 16 after waiting for an alarm at the time of completion of the shift. In other words, the driver can flexibly and manually operate the clutch 2 according to the driving conditions. Become.

FIG. 5 is a flow chart for explaining another control content performed by the control unit 4. In order to cope with the manual clutch operation during the shift control, a process from step 1.01 to step 1.17 is performed. When the clutch pedal 16 is depressed, control is transferred to steps 2.01 to 2.11 on condition that the pedal switch 15 is turned on.

In steps 2.01 to 2.06, upon detecting that the clutch pedal switch 15 is turned on, the shift position of the transmission 3 is immediately returned to the neutral position, and the gear shift actuator 19 is operated so as to perform the selecting operation to the required shift stage. The drive of the shift valve and the select valve is controlled, and then the clutch valve 28 is controlled.
Turn off. This is because the shift position of the transmission 3 is returned to the neutral position and then the clutch valve 2
Unless the clutch 8 is turned off, the clutch 2 temporarily operates in the engagement direction when the double check valve 25 is switched due to the release of the clutch valve 28 to the atmosphere (in some cases, the clutch 2 is engaged and a large shock is generated). . Steps 1.01 to 1.20 and steps 2.07 to 2.11 are described in FIGS.
Since the operation content is the same as that of the above, the duplicate description will be omitted.

According to this, even if the clutch pedal 16 is depressed during the control of the automatic transmission, the gear setting can be quickly completed by the synchronizing mechanism of the transmission 3 without interrupting the transmission operation.

[0029]

[Effect of the Invention] In short, according to the first invention, the speed change
When a request occurs, the engine is returned to the fully closed accelerator position,
Disengage clutch before neuting transmission
Set to the neutral position, then connect the clutch and
Synchronous control of gin rotation and transmission output
When the input rotation enters the predetermined synchronization area for the rotation
The vehicle so that the required gear is
In an automatic transmission for a vehicle including a means for controlling a shift operation , a transmission is provided with a synchronization mechanism, and
While adding a clutch pedal to the transfer room,
In the system, the clutch that is interrupted according to the automatic transmission control
A drive circuit for automatic control with a latch valve
Drive the clutch in the intermittent direction according to the operation amount of the
Drive circuit for manual control via a double check valve
On in parallel, and turn on when the clutch pedal is depressed.
Pedal switch and when this switch is on
When a shift request is issued, instead of the automatic shift control described above,
While keeping the clutch valve on the clutch connection side,
The backup control is performed so that the transmission is set to the neutral position and then the gear is set to the required shift stage .
Means that, the alarm means to operate when the gear shift completion, since the provided, even when the clutch pedal is stepped on, the shift
Transmission synchronization to shift stages as required
The effect that the mechanism is effective and the speed change operation is possible is obtained.
Can be

According to the second invention, a shift request is generated.
And return the engine to the accelerator fully closed position and disengage the clutch.
Then set the transmission to neutral.
And then connect the clutch to reduce engine speed.
To control the output rotation of the transmission.
Required shift when the input rotation of
Controls the vehicle's shifting operation so that gears are shifted to the next gear
In the automatic transmission for a vehicle, the transmission includes a synchronization mechanism, and a clutch is provided in a cab.
While adding a pedal, the clutch
The clutch valve that is turned on and off according to the automatic shift control
Drive circuit for automatic control and clutch pedal operation
For manual control that drives the clutch in the intermittent direction according to the
Drive circuits are provided in parallel via double check valves
On the other hand, a pedal switch that turns on when the clutch pedal is depressed
Switch and this switch is turned on during the automatic speed change control.
The transmission once in neutral
After returning, switch the clutch valve to the clutch connection side
Or automatic transmission control to perform gear shifting to the required shift stage while keeping the clutch or clutch connected
Control means and a warning means which is activated when the gear shift is completed, so that even if the clutch pedal is depressed during the automatic shift control , the shift operation to the shift stage according to the shift request can be performed.
Use the transmission's synchronization mechanism to speed up
The effect of being able to perform is obtained .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an automatic transmission.

FIG. 2 is a configuration diagram of a clutch actuator.

FIG. 3 is a flowchart illustrating control contents of a control unit.

FIG. 4 is a flowchart illustrating control contents of a control unit.

FIG. 5 is a flowchart illustrating control contents of a control unit.

[Explanation of symbols]

 Reference Signs List 1 fuel injection pump 2 clutch 3 transmission 4 control unit 7 selector 9 range position sensor 11 clutch stroke sensor 12 shift position sensor 13 main shaft rotation sensor (vehicle speed sensor) 14 counter shaft rotation sensor 15 clutch pedal switch 16 clutch pedal 17 governor control device Reference Signs List 18 clutch actuator 19 gear shift actuator 20 clutch booster 21 master cylinder 28 clutch valve 40 accelerator pedal 41 alarm buzzer

Claims (2)

(57) [Scope of request for utility model registration] When a shift request is issued, an engine is accelerator-operated.
Return to the fully closed position, disengage the clutch, and
Position to the neutral position and then
Switch to connect and control the engine
The input rotation must be the same as the output rotation of the mission.
Gear shift to the required shift stage when the
As described above, in a vehicle automatic transmission provided with a means for controlling a vehicle shift operation , a transmission is provided with a synchronizing mechanism and a clutch cab is added to a cab.
On the other hand, the above-mentioned automatic transmission control of the clutch in the clutch drive system
For automatic control with intermittent clutch valve according to
Drive circuit and clutch according to the amount of clutch pedal operation
Double-click the drive circuit for manual control that drives the
The clutch pedal is installed in parallel via a check valve.
Pedal switch that turns on when the
When a shift request is issued while the switch is on, the automatic
Shift clutch valve to clutch connection side instead of shifting control
Keep transmission in neutral position while maintaining
To perform a gear set from the set to the required shift stage
Automatic transmission for a vehicle , further comprising: a backup control unit; and an alarm unit that operates when a gear shift is completed. 2. When a shift request occurs, the engine is depressed.
Return to the fully closed position, disengage the clutch, and
Position to the neutral position and then
Switch to connect and control the engine
The input rotation must be the same as the output rotation of the mission.
Gear shift to the required shift stage when the
As described above, in a vehicle automatic transmission provided with a means for controlling a vehicle shift operation , a transmission is provided with a synchronizing mechanism and a clutch cab is added to a cab.
On the other hand, the above-mentioned automatic shift control of the clutch in the drive system of the clutch
For automatic control with intermittent clutch valve according to
Drive circuit and clutch according to the amount of clutch pedal operation
Double-click the drive circuit for manual control that drives the
The clutch pedal is installed in parallel via a check valve.
Pedal switch that turns on when the
When this switch is turned on during control, the transmission
To the neutral position, and then
Switch to clutch connection side or clutch connection
To perform a gear set to the required shift stage while maintaining the side
Automatic transmission control means for backing up automatic transmission control, and alarm means which is activated when a gear shift is completed.