JP2832675B2 - Transmission control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control device for a vehicle such as a bus, and more particularly to a shift control device capable of speeding up a shift when a driver is in a hurry.

[0002]

2. Description of the Related Art In a shift control device used for a bus or the like,
In response to the switching of the shift lever, the pneumatic actuator of the transmission is operated to switch the gear position of the transmission.

In a conventional transmission control device, a pneumatic actuator is operated at a substantially constant speed by a substantially constant control air pressure so that gears in the transmission can be synchronized with each other. The times are almost equal, regardless of driving conditions.

[0004]

For example, in a driving situation in which the driver tends to panic, such as when downshifting on a downhill, an emergency shift may be required. However, the conventional shift control device requires the same shift time as a normal shift, and loses appropriate measures.

[0005] The control air pressure of the pneumatic actuator is set so as to secure a gear change when the gears of the transmission are synchronized. The value of the control air pressure is generally small and the engine is overrun. In this case, the operating force of the control air pressure becomes insufficient, and it is difficult to quickly change gears.

It is an object of the present invention to provide a shift control device which enables a driver to make an appropriate gear change when an emergency shift is required.

[0007]

The present invention will be described with reference to the drawings corresponding to the embodiments. In the shift control device according to the premise of the present invention, a shift lever in a vehicle driver's seat (12) is provided.
The pneumatic actuator (40, 46) is operated by the operation of (20), and the gear change of the transmission (36) in the power transmission system from the prime mover to the drive wheels is changed to the pneumatic actuator (40, 4).
Perform according to 6). And in the shift control device of the present invention,
Operate the clutch that connects and disconnects the power transmission system.
2) The depressing speed of the clutch pedal (24) and the moving speed of the shift lever (20) are detected.If the depressing speed of the clutch pedal (24) and the moving speed of the shift lever (20) are both high, the air pressure A shift control device characterized by increasing control air pressure of an actuator (40, 46).

[0008]

When the driver needs an emergency shift, the driver depresses the clutch pedal (24) at a high speed and shifts the shift lever.
Operate (20) at high speed. When the depressing speed of the clutch pedal (24) and the moving speed of the shift lever (20) are both high, the control air pressure of the pneumatic actuators (40, 46) is increased. As a result, the pneumatic actuator (40, 46)
As a result, the gear change is quickly achieved despite the operating force being increased and the engine being overrun.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a diagram showing each device of the shift control device of the bus 10 and its wiring diagram. In the driver's seat 12, an instrument panel 14, a steering wheel 16 and a seat 18 are provided, and a change lever 20 and a clutch pedal 24 which are operated manually and by foot by a driver sitting on the seat 18 are provided. . The lever position sensor 26 detects the position of the change lever 20 (forward 5
In the stage bus 10, the change levers 20 are R (reverse), 1 (first speed), 2 (second speed), 3 (third speed), 4 (4th speed)
Speed) and 5 (5th speed), for a total of six positions. ) Is detected. The first clutch sensor 28 detects that the clutch pedal 24
When the driver has not depressed the pedal and is in the depressing force releasing state, the driver is on and is off when the clutch pedal 24 is depressed. The second clutch sensor 29 is turned on when the clutch pedal 24 is depressed by a predetermined amount or more, and is turned off in other cases, and the microcomputer of the controller 34 detects the depression time of the clutch pedal 24. It has become. Display 30
It includes an alarm lamp which is provided in the instrument panel 14 and which indicates the gear position of the transmission 36 detected by the gear position sensor 38 and which is turned on when an abnormality occurs. The alarm buzzer 32 issues an alarm for an erroneous operation or abnormality. The acceleration sensor 33 is attached to the stem of the change lever 20 and detects the acceleration of the change lever 20. The controller 34 includes a microcomputer, and includes a clutch pedal 24, a lever position sensor 26, a first clutch sensor 28, a second clutch sensor 29, and an acceleration sensor 33.
And the like, and determines whether or not the vehicle speed is acceptable, and sends a control signal to the actuator.

The transmission 36 is provided with a power transmission system for transmitting the rotational power of the engine to the drive wheels, and transmits the rotational power to the drive wheels at a speed ratio corresponding to the gear position. The gear position sensor 38 detects the gear position of the transmission 36, and the detected value is sent to the controller 34. The vehicle speed sensor 39 detects the vehicle speed of the bus 10 from the rotation speed on the output side of the transmission 36, and the detected value is sent to the controller 34. The pneumatic shift cylinder 40 operates in connection with the on / off of the solenoid valves 42 and 44, and the shift position (not shown) of the shift select shaft (not shown) of the transmission 36 via the push rod 110 (FIG. 3). = Rotation position). The pneumatic select cylinder 46 operates in connection with ON / OFF of the solenoid valves 48 and 50 to switch the select position (= axial position) of the shift select shaft of the transmission 36. Transmission 36
The gear position can be switched by switching the rotational position and axial position of the shift select shaft by the pneumatic shift cylinder 40 and the pneumatic select cylinder 46.

The air tank 52 stores pressurized air generated by an air compressor (not shown) of the engine, is connected to the change lever 20 via a pressurized air supply line 54, and is connected to the pressurized air supply line. Transmission via 56 36
Are connected to a pneumatic shift cylinder 40 and a pneumatic select cylinder 46. The pressure reducing valves 58 and 60 are provided in the pressurized air supply pipes 54 and 56, respectively, and reduce the air pressure from the air tank 52 to an appropriate value to send the air pressure to the change lever 20 and the transmission 36 side. A change lever reaction force solenoid valve 62 is provided in the pressurized air supply line 54, and opens and closes the pressurized air supply line 54 according to a control signal from the controller 34. The shift lever 20 changes the N (neutral) ), The gear of the transmission 36 is still in the overrun state and the gear change in the transmission 36 cannot be performed, and the pressurized air supply line 54 is opened. The pressurized air from the air tank 52 is sent to the change lever 20 to provide resistance to the operation of the change lever 20, and when the gear shifting of the transmission 36 is completed, the resistance is reduced to shift the gear. Is notified to the driver that has been completed.

The solenoid valves 42 and 44 are pneumatic shift cylinders.
40 are provided corresponding to the respective pneumatic chambers 112 and 114 (FIG. 5), and when ON, pressurized air from the air tank 52 flows to the respective pneumatic chambers 112 and 114; 11
Release 2,114 to the atmosphere. Similarly, solenoid valves 48, 50
Are provided corresponding to the pneumatic chambers (not shown) of the pneumatic select cylinder 46.
Flow the pressurized air from 52 to each air pressure chamber.
Open each pneumatic chamber to the atmosphere.

An electromagnetic on-off valve 64 is provided in parallel with the pressure reducing valve 60, and is opened and closed by a control signal from the controller 34. When the electromagnetic on-off valve 64 is closed, the pressurized air from the air tank 52 is reduced in pressure to a predetermined value in the pressure reducing valve 60, and then sent to the pneumatic shift cylinder 40 and the pneumatic select cylinder 46, where The control air pressure is a normal value (small). On the other hand, solenoid on-off valve
When the valve 64 is open, the pressurized air from the air tank 52 is sent to the pneumatic shift cylinder 40 and the pneumatic select cylinder 46 via 58, omitting the decompression process in the pressure reducing valve 60, and controlling them. Is increased (greater).

FIG. 3 shows gear positions in the transmission 36. In this case, the transmission 36 has five forward speeds and one reverse speed, and R, 1, 2, 3, 4, and 5 indicate reverse, first speed, and second speed, respectively.
It corresponds to speed, 3rd speed, 4th speed, 5th speed. Each gear position is
This corresponds to the position of the shift select shaft of the transmission 36.
That is, the straight line extending to the left and right in FIG. 3 corresponds to N (neutral), and the shift select shaft
At the time of 2, 4 and at the time of 1, 3, 5, the gears are rotated in directions opposite to each other with respect to N (displacement in the shift direction) to achieve the gear position. Also, the shift select shaft is displaced in the select direction (corresponding to the linear direction extending in the left-right direction in FIG. 3) with respect to the N position in the shift direction, and the first position in the select direction corresponds to R, 1. , The second position corresponds to 2,3, and the third position corresponds to 4,5.

FIG. 4 is a table showing the relationship between the gear position and the on / off state of the solenoid valves 42 and 44 for the pneumatic shift cylinder 40. Solenoid valve in FIG. 4, corresponds to the solenoid valve 42, 44 respectively, ○, × are respectively turned on and off. ON / OFF of the solenoid valves 42 and 44 means ON / OFF of the first electromagnetic coil 78 in FIG. 3 and has nothing to do with ON / OFF of the second electromagnetic coil 90. When the shift select shaft is set to N, both the solenoid valves 42 and 44 are turned on, and when the shift select shaft is displaced in the shift directions R, 2, and 4 with respect to N, the solenoid valves 42 and 44 are turned on and off, respectively. When displacing to the 1, 3, 5 side, the solenoid valves 42, 4
4 are turned off and on, respectively.

FIG. 5 shows the structure of the pneumatic shift cylinder 40 in three operating positions. The upper, middle, and lower stages correspond to shift positions 1, 3, and 5 of the shift select shaft, N, and R, 2, and 4, respectively. The cylinder body 100 has an annular stopper 102 fitted on the inner peripheral side. Outer piston 104, 10
Numerals 6 are located on both sides in the axial direction with respect to the stopper 102, slide the cylinder body 100 in the axial direction, and the displacement is limited by the contact with the stopper 102. The inner piston 108 is
The inner pistons of the outer pistons 104 and 106 are slid in the axial direction, and the axial displacement of the outer pistons 104 and 106 with respect to the outer pistons 104 and 106 is limited by the contact of the ends of the outer pistons 104 and 106 with the inwardly projecting portions. The push rod 110 has one end connected to the inner piston 108 and is axially displaced integrally with the inner piston 108, and the other end is connected to the shift select shaft to rotate the shift select shaft. (Displaced in the shift direction). The pneumatic chambers 112 and 114 are
Pressurized air is formed in the cylinder body 100 on both sides with respect to the inner piston 108, and when the solenoid valves 42 and 44 are turned on.

At the time of gear change of the transmission 36, first,
Shift the shift select shaft to N in the rotation direction (shift direction).
Turn on both solenoid valves 42 and 44 to displace
The pneumatic shift cylinder 40 is operated. This allows
Both the pneumatic chambers 112 and 114 are supplied with pressurized air, and the outer pistons 104 and 106 come into contact with the stoppers 102. The inner piston 108 is entrained by the outer pistons 104 and 106 and The center position (Fig. 5
Middle position). Next, after operating the pneumatic select cylinder 46 to move the shift select shaft to the axial position (select position) corresponding to the new gear position, only one of the solenoid valves 42 and 44 is turned off. Solenoid valve 42,
When 44 is turned on and off, respectively, the pneumatic chamber 112 is discharged with pressurized air, the pneumatic chamber 114 is supplied with pressurized air, the pneumatic chambers 112 and 114 contract and expand, respectively, and the inner piston 108 is pushed. The rod 110 is pushed out of the cylinder body 100 (upper position in FIG. 5), and the shift select shaft rotates toward 1, 3, and 5 sides. When the solenoid valves 42 and 44 are turned off and on, respectively, the pneumatic chamber 112 is supplied with pressurized air, the pneumatic chamber 114 is discharged with pressurized air, and the pneumatic chambers 112 and 114 expand and contract, respectively. Inner piston
108 pulls the push rod 110 into the cylinder body 100 (the lower position in FIG. 5), and the shift select shaft
Rotate to 2 and 4 side.

FIG. 6 is a table showing the relationship between the gear position and the on / off state of the solenoid valves 48 and 50 for the pneumatic select cylinder 46. Solenoid valve 6, corresponds to the solenoid valve 48 and 50 respectively, ○, × are respectively turned on and off. The solenoid valves 48 and 50 are turned off and on when the shift select shaft is at the position of the select direction R and 1, respectively, and are turned on when the shift select shaft is at the position of the select direction 2 and 3 at the same time. When they are located at positions 4 and 5, they are turned on and off, respectively.

FIG. 1 is a flowchart of a shift control routine. In step S10, the first clutch sensor 28
It is determined whether or not the clutch pedal 24 is depressed on the basis of the input from the CPU. If the determination result is YES, the process proceeds to step S12, and if NO, the routine ends. In step S12, it is determined whether or not the position of the change lever 20 has been changed based on the input from the lever position sensor 26. If the determination result is YES, step S1
Then, if NO, the routine ends.

In step S14, the stepping speed Va of the clutch pedal 24 by the driver is detected. When the driver depresses the clutch pedal 24, the first clutch sensor 28
Is switched from on to off, and this time is set to t1, and when the clutch pedal 24 is depressed to a predetermined amount, the second clutch sensor 29 switches from off to on, and this time is set to t2. By measuring the elapsed time from time t1 to time t2, the depression speed Va of the clutch pedal 24 can be detected. Step S
In step 16, the moving speed Vb of the change lever 20 is detected. The acceleration sensor 33 detects the acceleration of the change lever 20, but when the driver quickly operates the change lever 20 for an emergency gear change, the acceleration of the change lever 20 also increases. Therefore, the moving speed Vb of the change lever 20 can be detected from the acceleration of the change lever 20. In step S18, the depressing speed Va of the clutch pedal 24 and the moving speed Vb of the change lever 20
Are both large. When the driver needs an urgent gear change, as in the case of an emergency downshift request when descending a hill, the driver depresses the clutch pedal 24 at a high speed and moves the change lever 20 at a high speed. , Va and Vb are both large. Based on YES and NO of the judgment result of step S18, step S
Proceed to 20 and S22. In step S20, the electromagnetic on-off valve 64 is turned on, opened, and the pressurized air from the air tank 52 is sent to the pneumatic shift cylinder 40 and the pneumatic select cylinder 46 without reducing the pressure. Thereby, the pneumatic shift cylinder 40 and the pneumatic select cylinder
46 is a large (= increased) control air pressure (for example, 7 to 8.5 kg / cm ^) when the solenoid valves 42, 44, 48 and 50 are on.
Receive the supply of 2) and increase the operating speed. On the other hand, in step S22, the electromagnetic switching valve 64 is turned off,
After being closed, the pressure of the pressurized air from the air tank 52 is reduced by the pressure reducing valve 60 and then sent to the pneumatic shift cylinder 40 and the pneumatic select cylinder 46. Accordingly, the pneumatic shift cylinder 40 and the pneumatic select cylinder 46 supply a small (= normal value) control air pressure (for example, 5 kg / cm ^ 2) when the solenoid valves 42, 44, 48, and 50 are on. It operates at the normal operating speed. After execution of step S20 or S22, the process proceeds to step S24.

In step S24, the solenoid valves 42 and 44 are both turned on, the pneumatic shift cylinder 40 is operated, and the shift select shaft of the transmission 36 is shifted (rotated) to the N position. In step S26, the solenoid valves 48 and 50 are
As described above, the pneumatic select cylinder 46 is operated by controlling the on / off operation, and the shift select shaft is selected (displaced in the axial direction) to the select position corresponding to the new position. In step S28, the pneumatic shift cylinder 40 is operated again to shift the shift select shaft from the N position to the new position.

[0022]

According to the present invention, when the driver needs an emergency shift, the pneumatic actuator is controlled by a large control air pressure, so that the operating force of the pneumatic actuator can be sufficiently increased. In other words, the gear change of the transmission can be performed accurately and promptly even when the gears of the transmission are overrun.

[Brief description of the drawings]

FIG. 1 is a flowchart of a shift control routine.

FIG. 2 is a diagram showing each device of a shift control device for a bus and its wiring diagram.

FIG. 3 is a diagram showing gear positions in a transmission.

FIG. 4 is a table showing a relationship between a gear position and ON / OFF of a solenoid valve for a pneumatic shift cylinder.

FIG. 5 shows the structure of a pneumatic shift cylinder in three operating positions.

FIG. 6 is a table showing a relationship between a gear position and ON / OFF of a solenoid valve for a pneumatic select cylinder.

[Explanation of symbols]

Reference Signs List 12 driver's seat (vehicle driver's seat) 20 change lever (shift lever) 24 clutch pedal 36 transmission 40 pneumatic shift cylinder (pneumatic actuator) 46 pneumatic select cylinder (pneumatic actuator) 60 pressure reducing valve 64 solenoid on-off valve

Claims (1)

(57) [Claims] 1. A pneumatic actuator (40, 46) is operated by operating a shift lever (20) in a vehicle driver's seat (12) to change gears of a transmission (36) in a power transmission system from a prime mover to drive wheels. In the shift control device performing the pneumatic actuators (40, 46), the depressing speed of a clutch pedal (24) of the vehicle driver's seat (12) operating a clutch for connecting and disconnecting the power transmission system, and the shift lever ( The moving speed of the pneumatic actuator (40, 46) is increased when the moving speed of the clutch pedal (24) and the moving speed of the shift lever (20) are both large. A shift control device characterized by the above-mentioned.