JPH05302531A - Speed change control device for motorcycle - Google Patents

Abstract

PURPOSE:To change the speed without returning a throttle grip. CONSTITUTION:A speed change control device incorporates a shift-up sensor 16 for detecting a speed change operation, and an output control means 17 for controlling an exhaust valve device 3. The control is carried out such that a valve element 4 in an exhaust valve device 3 is turned toward the closing side when the rotational speed of an engine exceeds a specified value and the shift-up sensor 16 detects a speed change operation. If a shift pedal 12 is operated so as to change the speed when the terms are satisfied, the engine power is lowered without returning a throttle grip. Since a load exerted upon a change mechanism in a speed change unit 11 upon speed change manipulation is temporarily lowered, the speed change can be made without returning the throttle grip.

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 motorcycle that reduces engine output during a shift operation so that the shift operation can be performed quickly and smoothly.

[0002]

2. Description of the Related Art Conventional motorcycles are configured to shift gears with a shift pedal. Generally, in a motorcycle running on road, in order to smoothly perform a shift operation, a shift operation is performed in which a throttle grip is returned at the same time as a clutch operation to reduce an engine output.

By the way, in motorcycles for motocross traveling, for example, in order to avoid the complexity of operating the clutch and the throttle, the clutch is not operated at the time of sudden acceleration, and the throttle grip is hardly returned to operate the shift-up operation. May be done.

[0004]

As described above, particularly in a motorcycle such as a motocross vehicle, when shifting to the high speed side without returning the throttle grip at the time of sudden acceleration, the load of the change mechanism of the transmission is large and the shift operation is large. Due to the hardness of the gear, it may not be possible to perform a quick and smooth shift operation.

[0005]

A shift control device for a motorcycle according to a first aspect of the present invention includes a shift sensor for detecting a shift operation in a shift device, and an exhaust gas of an engine when the shift sensor detects a shift operation. And a control means for controlling the control valve device in a direction in which the engine output becomes smaller.

A shift control device for a motorcycle according to a second aspect of the present invention includes a shift sensor for detecting a shift operation in the shift device, and a control for actuating a throttle valve to a close side when the shift sensor detects a shift operation. And means.

[0007]

According to the shift control device for a motorcycle of the present invention, when the shift device is operated to shift gears, the engine output is reduced without returning the throttle grip. For this reason, the load applied to the change mechanism of the transmission at the time of shifting is temporarily reduced, and the operation of returning the throttle grip becomes unnecessary.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the first invention will be described in detail below with reference to FIGS. FIG. 1 is a block diagram showing a shift control device for a motorcycle according to a first invention, FIG. 2 is a graph for explaining the operation of the shift control device for a motorcycle according to the first invention, and FIG. 3 is an operation flowchart. is there.

In these figures, 1 is an engine mounted on a motorcycle for motocross, for example. The engine 1 is a two-cycle engine, and an exhaust valve device 3 as an exhaust control valve device that changes the exhaust timing of the engine 1 according to the engine speed in the vicinity of the exhaust port of the cylinder 2.
Is installed.

The exhaust valve device 3 has a valve body 4 having a passage forming portion which is formed in a substantially hourglass shape and has a semicircular cross section.
A conventional servo motor 6 for rotating the valve body 4 around a rotation axis parallel to the crank shaft 5 and a control device (not shown) for controlling the operation of the servo motor 6 according to the engine speed. It has a well-known structure. That is, in the engine 1 including the exhaust valve device 3, when the engine speed is lower than the predetermined valve opening speed, the valve body 4 is rotated to the closed position shown in FIG. As the number of revolutions increases, the valve body 4 rotates counterclockwise from the state of FIG. 1 to open, and the exhaust timing gradually increases.

The timing for opening the valve element 4 of the exhaust valve device 3 is set based on the engine output curve shown in FIG.
2 shows the relationship between the output of the engine 1 and the opening degree of the valve body 4 of the exhaust valve device 3, the solid line in FIG. 2 shows the engine output curve when the valve body 4 is fixed in the fully open state, and the broken line shows the valve. The engine output curve when the body 4 is fixed in the fully closed state is shown. That is, the exhaust valve device 3 is controlled so that when the engine speed is lower than R, the valve body 4 is closed to obtain a high output in the low and medium speed ranges, and when the engine speed is higher than R, the valve body is controlled. 4 is controlled to open so that a high output can be obtained even in a high rotation range.

A carburetor 7 communicates with the cylinder 2 through an intake pipe 8, and an exhaust pipe 9 communicates with an exhaust port of the cylinder 2. The carburetor 7 includes a throttle valve 10 which is opened and closed by a throttle grip (not shown). Reference numeral 11 is a transmission of the engine 1, 12 is a shift pedal as a shift device for performing a shift operation, and the shift pedal 12 is coupled to a shift operation shaft 13 that drives a change mechanism of the transmission 11.

As the transmission 11, a conventionally known one is used in which a dog clutch (not shown) is actuated by swinging the shift pedal 12 upward or downward to rotate the shift operating shaft 13, thereby performing gear shifting. There is. That is, the shift pedal 12 is swung upward to shift up, and the swing downward to shift down. When shifting gears, the main clutch (not shown) is normally disengaged.

Reference numeral 14 is a shift control device according to the present invention. The shift control device 14 includes an engine speed sensor 15 for detecting the speed of the engine 1 and a shift-up sensor for detecting a shift operation on the shift pedal 12. 16 and output suppressing means 17 as control means for controlling the servomotor 6 of the exhaust valve device 3 and the like.

The engine speed sensor 15 detects the rotation of a magneto 18 mounted on the crankshaft 5 of the engine 1 and outputs engine speed data to an output restraining means 17, which will be described later. .. The shift-up sensor 16 is arranged in the vicinity of the center of swing of the shift pedal 12 and at a position separated from the shift pedal 12 by a dimension L. When the shift pedal 12 swings to the shift-up side, a shift signal is generated. Is output to the output suppressing means 17. The timing at which the shift-up sensor 16 outputs the shift signal is immediately after the shift pedal 12 starts the swinging operation, and the transmission 11
It is said to be before the dog clutch (not shown) is actuated. It should be noted that by separating the shift-up sensor 16 from the shift pedal 12 by a dimension L, the operation of the shift pedal 12 is erroneous by the shift-up sensor 16 when the shift pedal 12 slightly swings by an amount of play in the swinging direction. It prevents it from being detected.

When the shift-up sensor 16 is used, when the shift pedal 12 is operated to shift up, a shift signal is output to the output suppressing means 17 immediately after the start of the operation.

When a shift signal is input from the shift-up sensor 16, the output suppressing means 17 actuates the servomotor 6 of the exhaust valve device 3 to turn the valve body 4 once in a direction in which the engine output becomes smaller, It is configured to return to the original state after shifting. In this embodiment, the servo motor 6 is controlled as described above when the engine speed detected by the engine speed sensor 15 is higher than a predetermined control speed. In the present embodiment, the control speed is higher than the engine speed R shown in FIG. 2, and is substantially the same as the engine speed at which the maximum output is obtained (for example, 100).
00 rpm). When the engine speed reaches the control speed, the valve body 4 of the exhaust valve device 3 is in a substantially fully open state, and therefore, by fully closing the valve body 4 at that time, the engine output decreases. Become.

That is, when the valve body 4 is fully closed when the engine speed is R ₁ in FIG. 2, the engine output is a value based on the solid output curve (indicated by A in FIG. 2).
To a value (indicated by B in FIG. 2) based on the output curve of the broken line.

Further, the time (control time) during which the output suppressing means 17 controls the exhaust valve device 3 to reduce the engine output at the time of gear shifting is set to a fixed time required for gear shifting. In determining the control time, the time required for the valve body 4 of the exhaust valve device 3 to be fully closed, the time from the closing operation of the valve body 4 to the reduction of the engine output, and the like are taken into consideration. ..

The control time is calculated by calculating the load from the engine applied to the transmission 11 from the engine speed and the gear position of the transmission 11 at the time of shifting, and the control time can be extended or shortened according to the load value. It can also be controlled. By doing so, the engine output is reduced for a time corresponding to the engine operating state, and it is possible to prevent the state in which the engine output is reduced from becoming unnecessarily long. Further, when the shift-up sensor 16 no longer detects the shift operation on the shift pedal 12, the control can be terminated and the valve body 4 can be returned to the original state.

Next, the operation of the shift control device 14 according to the present invention will be described in detail with reference to the flow chart shown in FIG. When the engine is started, the engine speed sensor 1
5 outputs the engine speed data to the output control means 17, and the output control means 17 calculates the engine speed.

The engine speed is the control speed (10000
If it is smaller than rpm, the output control means 17 does not control the exhaust valve device 3 even if the shift pedal 12 is operated to change gears (step P ₁ ). When the engine speed becomes higher than the control rotational speed, the output control unit 17, as shown in step P ₂ is up-shifting sensor 16 determines whether it has detected a swing of the shift pedal 12, a shift-up when the shift signal from the sensor 16 is inputted, performs engine output control by controlling the exhaust valve device 3 in step P _3.

The engine output control is performed by the valve body 4 of the exhaust valve device 3.
Is turned to the closed side. By doing so, the exhaust timing is suddenly delayed when the engine 1 is rotating at a high speed, and the engine output is temporarily reduced even if the throttle valve 10 is fully open. Gear shifting is performed in such a state that the engine output is reduced. That is, when the gear shift operation is performed, the load on the change mechanism of the transmission 11 is reduced due to the reduction of the output of the engine 1, so that the gear shift can be performed without returning the throttle grip.

After the engine output control is completed, as shown in step P ₄ , it is confirmed that the shift signal is not input from the shift-up sensor 16, and step P 4
Return to ₁ and repeat the above operation.

Therefore, according to the shift control device 14 thus constructed, when the shift pedal 12 is operated to shift gears when the engine speed is higher than a predetermined control speed, the throttle valve 10 is fully opened. Even if it is in the state, the engine output decreases. Therefore, the load applied to the change mechanism of the transmission 11 during the gear shift is temporarily reduced, and the operation of returning the throttle grip is not necessary. Further, as shown in this embodiment, if the output control is performed when the engine speed becomes higher than the predetermined engine speed, this control will not be performed when the engine is rotating at a low speed. The engine output does not further decrease due to gear shifting at low rotation speed where output is small.

In the above embodiment, the example using the two-cycle engine is shown, but a four-cycle engine can be used as shown in FIG. FIG. 4 is a configuration diagram showing another embodiment in which the first invention is applied to a four-cycle engine, and in the figure, the same or equivalent members as those described in FIG. Is omitted.

In FIG. 4, reference numeral 21 denotes a four-cycle engine for a motorcycle, which includes a carburetor 7 and an exhaust pipe 22. And, in the exhaust pipe 22 of the engine 21,
An exhaust control valve device 23 is provided.

The exhaust control valve device 23 changes the substantial exhaust pipe length of the exhaust pipe 22 according to the engine speed to control the cycle of exhaust pulsation to be optimum for the engine operating state, and to rotate the engine output. It is configured to increase over the entire area. As its structure, a valve body 25 rotatably provided at a rear end portion of the exhaust pipe 22 for narrowing the rear end portion of the exhaust pipe 22 and a servo motor 2 for driving the valve body 25 are provided.
6 and a control device (not shown) for controlling the operation of the servo motor 26 according to the engine speed.

The output control means 17 used in this embodiment is configured to control the exhaust control valve device 23 described above. That is, when the shift-up sensor 16 detects a shift operation on the shift pedal 12 when the engine speed is equal to or higher than the control speed, the output control means 17 controls the exhaust control valve device 23 in the direction in which the engine output becomes smaller. become.

When the engine speed is in the high speed range, the valve body 25 of the exhaust control valve device 23 operates by narrowing the exhaust pipe 22 to shorten the substantial exhaust pipe length, so that output control is performed. At times, the valve body 25 may be turned to the open side to increase the substantial exhaust pipe length.

Even if the exhaust control valve device 23 is controlled in this manner, the same effect as that of the above embodiment can be obtained.

Next, the second invention will be described with reference to FIG. FIG. 5 is a block diagram showing a shift control device for a motorcycle according to the second invention. In the figure, the same or equivalent members as those described in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

The engine 1 shown in FIG. 5 is a two-cycle engine, and the shift control device 14 provided in the engine 1
Is configured to control the throttle valve device 31 of the carburetor 7.

The throttle valve device 31 includes the throttle valve 1
In addition to a mechanism for opening and closing 0 by operating a throttle grip (not shown), a mechanism for opening and closing is driven by a servo motor 32. The drive mechanism connected to the servo motor 32 releases the connection between the drive mechanism connected to the throttle grip and the throttle valve 10 by operating the servo motor 32, and the servo motor 3
2 is used as a drive source to open and close the throttle valve 10.

That is, in the carburetor 7 having the throttle valve device 31, the throttle valve 10 is normally opened and closed by operating the throttle grip,
When the servo motor 32 operates, the throttle valve 10 is opened and closed by the servo motor 32 regardless of the rotational position of the throttle grip.

The output control means 17 of the output control device 14 used in this embodiment, when the engine speed is equal to or higher than the control speed and the shift signal from the shift-up sensor 16 is input, Throttle valve device 3
The servo motor 32 of No. 1 is operated to fully close the throttle valve 10. That is, even if the throttle grip is turned to the engine fully open position,
The output control means 17 closes the throttle valve 10 to reduce the engine output.

Therefore, in this way, the shift control device 14
Even if the throttle valve 10 is configured to be controlled by the above, the load applied to the change mechanism of the transmission 11 at the time of shifting is temporarily reduced, and the operation of returning the throttle grip is unnecessary.

As the structure of the throttle valve device 31, the structure of the device disclosed in, for example, Japanese Patent Laid-Open No. 59-158361 can be used in addition to the structure described above. The throttle valve device disclosed in this publication has a structure in which a venturi valve is moved up and down by a drive motor, and a throttle valve that is opened and closed by a throttle grip is provided upstream of the valve with respect to intake air.
That is, when the device disclosed in this publication is applied to the throttle valve device 31 of the present embodiment, the fuel supply amount is controlled by the throttle valve, and the intake passage is opened and closed by the valve driven by the drive motor. The structure may be changed slightly. At this time, it goes without saying that the drive motor is connected to the output control means 17.

[0039]

As described above, the shift control device for a motorcycle according to the first aspect of the present invention includes a shift sensor for detecting a shift operation in the shift device, and an engine when the shift sensor detects a shift operation. A shift control device for a motorcycle according to a second aspect of the present invention includes a shift sensor that detects a shift operation in the shift device. Since the shift sensor is provided with a control means for actuating the throttle valve to the closing side when a shift operation is detected, when the shift device is operated to perform a shift, the engine output is output without returning the throttle grip. Is reduced.

Therefore, the load applied to the change mechanism of the transmission at the time of shifting is temporarily reduced, so that the shifting operation at the time of sudden acceleration can be performed without returning the throttle grip. Therefore, it is possible to change gears quickly and smoothly during sudden acceleration.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a shift control device for a motorcycle according to a first invention.

FIG. 2 is a graph for explaining the operation of the shift control device for a motorcycle according to the first aspect of the invention.

FIG. 3 is an operation flowchart of the shift control device for a motorcycle according to the first aspect of the present invention.

FIG. 4 is a configuration diagram showing another embodiment in which the first invention is applied to a 4-cycle engine.

FIG. 5 is a configuration diagram showing a shift control device for a motorcycle according to a second invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 engine 3 exhaust valve device 7 carburetor 10 throttle valve 11 transmission 12 shift pedal 14 shift control device 15 engine speed sensor 16 shift up sensor 17 output control means 21 engine 23 exhaust control valve device 31 throttle valve device

Claims (2)

[Claims] 1. A shift sensor for detecting a shift operation in a shift device, and a control means for controlling an exhaust control valve device of an engine in a direction in which an engine output decreases when the shift sensor detects a shift operation. A shift control device for a motorcycle, characterized in that 2. A motorcycle comprising: a shift sensor for detecting a shift operation in a shift device; and a control means for activating a throttle valve to a closing side when the shift sensor detects a shift operation. Shift control device.