JPS60175740A - Tuning switching device for air intake throttle valve in multicylinder internal combustion engine - Google Patents

Abstract

PURPOSE:To increase the degree of freedom of arrangement of respective air intake passages by tuning respective throttle valves with use of an electric signal in the captioned device in which the throttle valves each provided on the plural air intake passages are tuned with each other by means of a single operation body. CONSTITUTION:Applied the captioned device to a motor cycle, a rotation displacement of an operating body 50 operated by a driver is converted to an electric displacement signal through a transducer 42 and delivered to a control unit 40. An electric driving signal is issued from the same unit 40, and applied to servomotors 41, 41a connected with respective throttle valves 32, 32a of plural carburetors 30, 30a for their controlled rotation. Hereby, the respective throttle valves 32, 32a are tuned with each other, and displaced in rotation so as to reach an opening corresponding to a rotation displacement of the operating body 50.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a synchronized opening/closing device for an intake throttle valve of a multi-cylinder internal combustion engine suitable for motorcycles and the like.

(Prior art) A multi-cylinder internal combustion engine is provided with a plurality of intake passages, each of which is provided with a throttle valve for controlling the amount of intake air, and the throttle valves are synchronized with each other by a single operator. There are some that open and close. A synchronized opening/closing bag #t for throttle valves used in such cases is one in which the operating shafts of each throttle valve are interlocked by a mechanical link device (for example, the
46041). Although the synchronization of each throttle valve is maintained well, this is subject to restrictions due to the arrangement of each intake passage.For example, in the case of the arrangement shown in Fig. 1, each intake passage 2
2, 22a is the carburetor 30.3012 installed in cylinder 2.
Since it is located on both sides of 10, the operating axis of each aperture p direction is 32.32
111 cannot be linked with a link device. One way to solve this problem is to link each throttle valve with a control cable consisting of an outer cylinder and an inner element, but it is difficult to maintain correct synchronization due to play and friction between the outer cylinder and the inner cable, and it is especially difficult for automatic Vehicles that have a lot of vibration due to engines and other factors, such as motorcycles! In this case, the control cable swings and the tension of the inner cable against the outer cylinder changes.
It is difficult to get the correct synchronization.

(Object of the Invention) An object of the present invention is to provide a throttle valve tuning opening/closing device which has a high degree of freedom in arranging each intake passage and has high precision in the tuning relationship by synchronizing each throttle valve with an electric signal.

(Structure of the Invention) To achieve the above object, the present invention provides a tuned opening/closing device for a throttle valve of this type, which includes a transducer that converts the displacement of an operator into an electrical displacement signal, and a transducer that receives the electrical displacement signal. a control unit that is connected to an operating shaft of at least one of the throttle valves and receives the electric drive signals to operate the throttle valve to an opening corresponding to the displacement of the operator; It is characterized by being equipped with a servo motor for displacement.

(Effects of the Invention) According to the present invention, each throttle valve and the control unit can be connected by electrical wiring, so the arrangement of each intake passage can be freely arranged, and the electric signal is not affected by the wiring condition, vibration, etc. Therefore, the accuracy of the synchronization relationship can be maintained.

(Embodiment) FIGS. 1 and 2 show a first embodiment in which the present invention is applied to a motorcycle, in which the rotational displacement of an operator 50 operated by a driver is converted into an electrical displacement signal by a transducer 42. It is converted and sent to the control unit 40, and the plow control unit 40 also generates an electric drive signal to control the throttle valves 32, 3 of the plurality of carburetors 30, 30a.
The throttle valves 32 and 32a are simultaneously sent to the servo motors 41 and 41a connected to the controller 2a, and the throttle valves 32 and 32a are rotated to an opening corresponding to the rotational displacement of the operator 50.

In FIG. 1, a frame 10, which is the main part of the vehicle body, has a front fork 11, a front wheel 12, and a rear arm 16 at the front and rear, respectively.
It is supported by the rear wheels 14, and a fuel tank 15 is placed on the front upper part, and a seat 16 is placed behind it. A handlebar 17 is fixed to the upper part of the front fork 11.

A multi-cylinder internal combustion engine 20 mounted on the lower part of the frame 10 has cylinders 21 and 21a in a so-called type arrangement, and the upward cylinder 21 has an intake passage 22 equipped with a carburetor 30 at the rear and receives air from a cleaner box 26. The forward cylinder 2112 has an intake passage 2 with a carburetor '50a above.
2a is provided to suck air from the cleaner box '26tl. Each cylinder 21, 21a is exhausted from each exhaust port 23.
, 230, and is led to the muffler 25 through an exhaust pipe 24.24111 connected to the exhaust pipe 24.24111, where it is muffled and discharged rearward.

FIG. 2 shows a detailed measurement of the tuned opening/closing device of the throttle valves 32, 32+2 of the carburetor 60° 3 Oa provided in each intake passage 22, 22a. The pores 3i, 3ia of each vaporizer 30.31M form a part of each intake passage 22', 22a, and the pore 31
．． A throttle valve 32° 32a is provided in 3112 so that it can be opened and closed. Each throttle valve 32, 32a is driven by a servo motor 41.41112 driven by a control unit 40, which will be described later.
It opens and closes by being fixed to an operating shaft 33.3312 connected to.

A transducer 42 such as a potentiometer installed on a part of the frame 10 is rotated by an operator 50 such as an accelerator grip rotatably provided at one end of the handle par 17 via a control cape v51 and a lever 52, converting the rotation angle of the operator 50 into an electrical displacement signal;
via electrical connection 46 to control unit 40. The control unit 40 receives the electrical displacement signal, generates an electrical drive signal corresponding to the electrical displacement signal, and sends it to the servo motors 41 and 41a, each having the same characteristics, through electrical connections 44 and 44a provided in parallel. This rotates in sync.

When the operator 50 such as an accelerator grip is rotated, the transducer 42 also rotates via the control cape (v51), and the rotation is converted into an electrical displacement signal and sent to the control unit 40.

In response to this, the control unit 40 generates an electric drive signal and sends it to the motors 41, 41a to synchronize each throttle valve 62.32a with the operating shaft 33. It rotates to the opening degree corresponding to the rotation angle of. Therefore, each throttle valve 32.degree. 32a is opened and closed in synchronization with each other by the operator 50.

In the first embodiment, two throttle valves 2°3211
Although the description has been made for a device equipped with one throttle valve, it can be similarly implemented in a device equipped with six or more throttle valves.

The second embodiment shown in FIG.
52a's operating shaft roller 3a, control cape)l
The transducer 421 is opened and closed by the operator 50 via the lever 52b and the lever 52b, and is provided on the operating shaft 33a.
) converts the rotation angle of the operator 500 into an electrical displacement signal, and connects it to the control unit 4 via an electrical connection 431).
This differs from the first embodiment in that the data is sent to 0. In the second embodiment, the transducer 42b and the servo motor 4
1 so that the rotation angle of the operating shaft 33a is the same.

You need to choose 41 characteristics. In the second embodiment shown, the diaphragm p is driven by the control unit 40.
Although the number of valves is one, it is also possible to have two or more valves.

Although there are no particular restrictions on the type of servo motor used in each of the above embodiments, a step motor is preferred from the standpoint of cost and size. In this case, in order to improve the precision of synchronization with the operator, it is preferable to reduce the speed of the output shaft of the step motor and connect it to the operating shaft of the throttle valve.

(Effects of Embodiment) In the first embodiment described above, the control unit 40 is
Since an electrical drive signal corresponding to the rotation angle of 0 is generated and sent to the servo motors 41 and 410 through electrical connections 44 and 44a provided in parallel to open and close the throttle valves 32 and 320, both The throttle valves 32, 32a are tuned by electrical signals, so that no matter how the respective intake passages 22, 22.12 are arranged, the throttle valves 32, 320 can be opened and closed in a synchronous manner; Since it does not change in quality due to the length of the connection, bending, or vibrations in the surroundings, there is no error in the tuning relationship.

In the second embodiment, one throttle valve 32a is directly opened and closed by an operator 50, and at the same time a transducer 42b that provides an electrical displacement signal to a control unit 40 is connected to an operating shaft 33.
a, and sends an electric drive signal generated by the control unit 40 to the servo motor 41 to open and close the other throttle valve '52. Therefore, both throttle valves 32, 32a are synchronized by the electric signal and the As in the first embodiment, the intake passage 22.2? There are no restrictions on the arrangement of the circuits, and no errors occur in the tuning relationship due to wiring conditions, vibrations, etc. In the second embodiment, it is necessary to match the characteristics of the transducer 42111 and the servo motor 41, but there is an advantage that one servo motor can be omitted.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a side view of a motorcycle equipped with the first embodiment, FIG. 2 is a perspective view of the main parts, and FIG. 3 is a side view of a motorcycle equipped with the first embodiment. FIG. 2 is a diagram corresponding to FIG. 2 of the second embodiment. Explanation of code 20...Multi-cylinder internal combustion engine, 22.2? ... Intake passage, 32.32111 ... Throttle valve, 33. Ro3a...
Operating axis, 40...Control unit, 41°41
a... Servo motor, 42,421)... Transducer, 50... Operator. Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Teru Hase - (1 other person) Figure 2-216- Figure 3

Claims (1)

[Claims] In a multi-cylinder internal combustion engine in which a plurality of intake passages are each provided with a throttle valve that controls the amount of intake air, and the throttle valves are opened and closed in synchrony with each other by a single operator, the displacement of the operator is detected as an electrical displacement signal. a control unit configured to receive the electrical displacement signal and generate a corresponding electrical drive signal; A synchronized opening/closing device for an intake throttle valve, comprising a servo motor that receives a signal and displaces the throttle valve to an opening degree corresponding to the displacement of the operator.