JPH06264995A - Control device of mechanical automatic transmission - Google Patents

Abstract

PURPOSE:To carry out transmission in a short time without breaking a clutch by controlling increase and decrease of rotational difference of a transmission synchro-mesh and making a state that the rotational difference is zero. CONSTITUTION:Rotation sensors 12 and 13 detect rotational speed of an input shaft 11a of a transmission 11 and an output shaft 11b respectively. A controller 10 subtracts output shaft rotational speed N2 from a value (N1/R) dividing output shaft rotational speed N1 with a transmission gear ratio R of the transmission 11, and when this subtracted value DELTAN is plus, for example, this input shaft rotational speed is made rotational speed N3 which is slightly lower than this output shaft rotational speed N2, and by making this rotational speed N3 as target rotational speed, rotational speed of the input shaft 11a is adjusted by an actuator 18 for fuel adjustment. Thereafter, at timing (time T1) when DELTAN becomes zero in an adjustment process of the rotational speed of the input shaft 11a, the controller 10 negatively actuates a clutch actuator 21 and without breaking a clutch 19 and by a transmission actuator 22, controls to change a gear position to a specified gear position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a mechanical automatic transmission that automatically selects and controls an appropriate transmission gear position according to vehicle conditions.

[0002]

2. Description of the Related Art Conventionally, in a control device for an automatic transmission of this type, a clutch actuator is used to disengage a clutch during a gear shift, and a gear of the geared transmission is disengaged, and then a gear shift is performed. The actuator was shifting to a predetermined gear position.

[0003]

For this reason, there is a problem that it takes a relatively long time from the clutch disengagement to the gear disengagement and gear engagement. In order to improve this point, an attempt was made to shift gears by the synchronizer without disengaging the clutch, but there were the following drawbacks. That is, the synchronizer is configured so as not to shift unless the relative rotation between the input shaft and the output shaft of the transmission becomes completely zero and the torque does not act and the synchronous state is not reached. On the other hand, the engine has fluctuations in rotation, and even if an attempt is made to achieve perfect synchronization by computer control, it is difficult to create perfect synchronization due to fluctuations in engine rotation. As a result, there is a drawback that the shift time is not shortened.

Specifically, as shown in FIG. 3, for example, in order to shift from the third speed to the fourth speed, the rotation speed N ₁ (for example, 2000 rpm) of the input shaft of the transmission is set to the synchronous state of the transmission. Predetermined rotation speed N ₂ (eg 1500 rpm)
In this case, the controller reduces the rotational speed N ₁ of the input shaft by controlling the fuel adjustment actuator that adjusts the injection amount of the fuel injection pump. When the speed N ₁ approaches the predetermined rotational speed N ₂ , the controller decelerates. The speed is reduced to ensure accurate synchronization. When the vehicle is a bus, it takes about 0.5 seconds (t ₁ ) until the rotation speed N ₁ starts shifting and approaches the rotation speed N ₂ , from which the predetermined rotation speed N ₂ is reached.
It takes about 0.5 to 2.0 seconds (t ₂ ) to reach. The same phenomenon occurs when the gear position of the transmission is changed to the reduction gear.

An object of the present invention is to provide a control device for a mechanical automatic transmission that can shift in a short time by using a synchronizing device without disengaging a clutch.

[0006]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiments. The present invention relates to an input shaft rotation sensor 12 of a mechanical automatic transmission 11 and an output shaft rotation sensor 1 of this transmission.
3, a gear position sensor 14 of the transmission, a speed change actuator 22 that changes the gear position of the transmission, a fuel adjustment actuator 18 that adjusts the injection amount of the fuel injection pump 16, and a clutch actuator that connects and disconnects the clutch 19. 21, the input shaft rotation speed N ₁ detected by the input shaft rotation sensor 12, the output shaft rotation speed N ₂ detected by the output shaft rotation sensor 13, and the gear position detected by the gear position sensor 14, the gear shift actuator 22 performs gear shifting. This is an improvement of a control device for a mechanical automatic transmission including a controller 10 for changing the gear position of the machine to a predetermined gear position.

The characteristic configuration is that when the controller 10 changes the gear position of the transmission 11, the input shaft rotation speed N
_The output shaft rotation speed N ₂ is subtracted from a value (N ₁ / R) obtained by dividing ₁ by the transmission ratio R of the transmission 11, and when the subtraction value ΔN is positive, the shift target value of the input shaft rotation speed is To the rotational speed N ₃ which is slightly lower than the output shaft rotational speed, or when the subtraction value is negative, the shift target value of the input shaft rotational speed is set to a rotational speed slightly higher than the output shaft rotational speed to adjust the fuel, respectively. Adjustment is performed by the actuator 18, and at the timing (time T ₁ ) when the subtraction value becomes zero in the process of adjusting the rotation speed of the input shaft, the clutch actuator 21 is deactivated and the clutch 19 is not disengaged. The control is to change the position to the predetermined gear position.

[0008]

When the shift target value of the input shaft rotation speed N ₁ during shifting is the rotation speed N ₃ slightly exceeding the output shaft rotation speed N ₂ , the subtraction value ΔN becomes zero (time T ₁ ). The rotation speed of the input shaft changes relatively quickly. In a synchronized state where the subtraction value ΔN is zero (time T ₁ ), the gear can be shifted to a predetermined gear position without disengaging the clutch 19.

[0009]

An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a controller for a mechanical automatic transmission is a controller 1 including a microcomputer.
Equipped with 0. This transmission 11 has an input shaft 11a and an output shaft 1
It is a two-shaft transmission including 1b and an intermediate shaft 11c.
In the figure, gears inside the transmission are omitted. The controller 10 includes an input shaft rotation sensor 12 of a mechanical automatic transmission 11
And the detection outputs of the output shaft rotation sensor 13 of the transmission 11 and the gear position sensor 14 of the transmission 11 are connected. The rotation sensors 12 and 13 detect the rotation speeds of the input shaft 11a and the output shaft 11b of the transmission 11, respectively. Gear position sensor 1
Reference numeral 4 detects the gear position of the transmission 11 in mesh with the transmission 11.

The load lever 17 of the fuel injection pump 16 of the engine 15 is provided with a fuel adjusting actuator 18 composed of a linear solenoid for moving the position of the load lever 17. The actuator 1 has a controller 1
The control output of 0 is connected. The clutch 19 is provided with a clutch actuator 21 including an air cylinder that connects and disconnects the clutch. Further, the transmission 11 is provided with a shift actuator 22 including an air cylinder for shifting and selecting a shift gear.

The clutch actuator 21 and the speed change actuator 22 are provided with air supply air pipes 23 and 2 respectively.
The air tank 26 is connected via the No. 4. An exhaust pipe 27 is connected to the actuator 21. An air supply solenoid valve 28 is provided in the middle of the air pipe 23, and an air supply / exhaust solenoid valve 29 is provided in the middle of the air pipe 24. An exhaust solenoid valve 30 is provided in the middle of the air pipe 27. These solenoid valves 28 to 30 include the controller 10 described above.
The control output of is connected.

In order to realize economical traveling and smooth traveling of the vehicle, the controller 10 is provided with operating conditions such as an appropriate shift gear position and fuel injection amount according to the rotation of the input shaft 11a and the output shaft 11b of the transmission 11. When the stored memory is built-in and each signal of the sensors 12 to 14 is input to the controller 10, the controller 10 sets the proper operating conditions stored in the memory based on a preset program. The actuators 18, 21 and 22 are controlled.

A characteristic structure of the present embodiment is how the timing of the gear change by the controller 10 at the time of shifting is set. That is, the controller 10 divides the input shaft rotation speed N ₁ by the gear ratio R of the transmission 11 (N ₁ / R)
When the output shaft rotational speed N ₂ is subtracted from the output shaft rotational speed N ₂ and the subtracted value ΔN is positive, the input shaft rotational speed N ₃ is slightly lower than the output shaft rotational speed N ₂ as shown in FIG. Then, the rotational speed of the input shaft is adjusted by the fuel adjusting actuator 18 using this rotational speed N ₃ as the target rotational speed. Next, the controller 10 does not disengage the clutch actuator 21 to disengage the clutch 19 at a timing (time T ₁ ) when the ΔN becomes zero in the process of adjusting the rotational speed of the input shaft, and the gear shift actuator 22 sets the gear position to a predetermined gear position. Control to change to the gear position of. The same applies when changing the gear position to the reduction gear. The rotation speed N ₃ has a difference of about 1 to 3% from the output shaft rotation speed N ₂ , and this difference is larger as the rotation speed N ₂ is higher. In FIG. 2, the vertical axis is the rotation speed and the horizontal axis is the time.

In the control device having such a structure, the gear shift target value of the input shaft rotation speed N _{1 at the time} of gear shifting is the output shaft rotation speed N ₂
Since the rotational speed N ₃ slightly exceeds the input shaft rotational speed, the input shaft rotational speed changes relatively quickly until the subtraction value ΔN becomes zero (time T ₁ ). In a synchronized state where the subtraction value ΔN is zero (time T ₁ ), the gear can be shifted to a predetermined gear position without disengaging the clutch 19. The time required for shifting is shortened from the conventional (t ₁ + t ₂ ) time to t ₁ hour.

[0015]

As described above, according to the present invention, conventionally, the gear shift speed is reduced near the gear shift target value and the gear shift takes a long time due to the engine rotation fluctuation. By setting the gear shift target value slightly different from the value that is in the synchronized state, in other words, intentionally, the rotational difference of the transmission synchronizer is changed from plus to minus or from minus to plus, respectively. In this way, the input shaft rotational speed can be changed in a short time up to the rotational speed at which the rotational speed becomes the synchronous state by making the control so that the rotational difference is zero. As a result, the gear shift can be performed using the synchronizer while the clutch is engaged.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a control device for a mechanical automatic transmission according to an embodiment of the present invention.

FIG. 2 is a diagram showing the shift status.

FIG. 3 is a diagram corresponding to FIG. 2 showing a conventional shift condition.

[Explanation of symbols]

 10 Controller 11 Automatic Transmission 12 Input Shaft Rotation Sensor 13 Output Shaft Rotation Sensor 14 Gear Position Sensor 16 Fuel Injection Pump 18 Fuel Adjustment Actuator 19 Clutch 21 Clutch Actuator 22 Gear Change Actuator

Claims (1)

[Claims] An input shaft rotation sensor (12) for a mechanical automatic transmission (11), an output shaft rotation sensor (13) for the transmission, a gear position sensor (14) for the transmission, and the shift Speed change actuator that changes the gear position of machine (22)
And a fuel adjustment actuator (18) for adjusting the injection amount of the fuel injection pump (16) and a clutch actuator (21) for connecting and disconnecting the clutch (19).
And the input shaft rotation speed (N
₁ ), the output shaft rotation speed (N ₂ ) detected by the output shaft rotation sensor (13), and the gear position detected by the gear position sensor (14) based on the gear position detected by the gear change actuator (22). Controller (10) that changes the position to a predetermined gear position
In a control device for a mechanical automatic transmission comprising: the controller (10), when changing the gear position of the transmission (11), the input shaft rotation speed (N ₁ ) is set to the transmission (11). Gear ratio (R)
The output shaft rotation speed (N ₂ ) is subtracted from the value divided by, and when this subtraction value (ΔN) is positive, the shift target value of the input shaft rotation speed is slightly lower than the output shaft rotation speed. (N ₃ ), or when the subtracted value is negative, the shift target value of the input shaft rotation speed is adjusted to a rotation speed slightly higher than the output shaft rotation speed by the fuel adjustment actuator (18). The speed change actuator (22) without disengaging the clutch actuator (21) and disengaging the clutch (19) at the timing (T ₁ ) at which the subtraction value becomes zero in the process of adjusting the rotation speed of the input shaft A control device for a mechanical automatic transmission, characterized in that the gear position is controlled to be changed to the predetermined gear position.