JP2003328784A - Throttle device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throttle device for a motorcycle or the like which has good assembly workability, easy maintenance, a smooth operation of the throttle grip and good responsiveness. <P>SOLUTION: An engine is installed and a handle bar 1 for steering is provided, and the throttle grip 15 is rotatably provided on one end part of the handle bar 1. A throttle valve drive motor 27 is interlockingly connected to throttle valve 26 of engine, and a rotation angle sensor 38 detecting the rotation angle of the throttle grip 15 is arranged on the end of the inside in the car width direction of the throttle grip 15. The rotation angle sensor 38 and the throttle valve drive motor 27 are connected to an electronic control unit 35 with lead wire 39, 40, the opening of the throttle valve 26 is adjusted by rotating the throttle valve drive motor 27 based on the rotation angle detection signal by the rotation angle sensor 38. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle equipped with an engine and a steering handlebar, and in particular, a throttle grip is rotatably provided at an end portion of the handlebar as in a motorcycle. The present invention relates to a vehicle throttle device.

[0002]

2. Description of the Related Art In a vehicle such as a motorcycle equipped with an engine and equipped with a handlebar, a conventional throttle device has a throttle valve in a throttle body (or a carburetor) arranged in an intake passage and a handlebar. The reel of the provided throttle grip is interlockingly connected by a wire cable, and the rotation of the throttle grip is transmitted to the throttle valve via this wire cable to adjust the throttle opening and control the intake air amount. It is like this.

In addition, when the engine is equipped with a fuel injection device, a rotation angle sensor is attached to a throttle valve incorporated in the throttle body, and the opening degree of the throttle valve is detected to detect the throttle opening degree. The fuel injection amount and the ignition timing are adjusted according to the above.

[0004]

In the case of the wire cable system in which the rotation of the throttle grip is transmitted to the throttle valve by a wire cable, other mounted parts such as the handle bar throttle grip to the engine carburetor are attached during manufacturing and assembly. It is necessary to dispose the wire cable while avoiding the above, and to adjust the tension of the wire cable to a predetermined value, which is troublesome for the assembling work.

Further, it is necessary to adjust the tension of the wire cable in accordance with the play generated at the connecting portion of the wire cable and the reel of the throttle grip and the extension of the wire cable due to use, and maintenance is troublesome.

In the wire cable system, the tension of the wire cable is applied to the throttle grip, and the tension increases as the throttle grip rotates in the opening direction. Therefore, the operation force of the throttle grip becomes heavy.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a throttle device which is easier to assemble, easier to maintain, does not require a heavy throttle grip operation and is more responsive than a wire cable type throttle device. It is to be.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application mounts an engine and includes a steering handlebar, and a throttle grip is rotated at one end of the handlebar. In the possible throttle device of the vehicle, the throttle valve drive motor is interlocked with the throttle valve arranged in the intake path of the engine, and the rotation angle of the throttle grip is adjusted at the inner end of the throttle grip in the vehicle width direction. The rotation angle sensor for detection is arranged, the rotation angle sensor and the throttle valve drive motor are connected to the electronic control unit by the lead wire, and the throttle valve drive motor is rotated based on the rotation angle detection signal from the rotation angle sensor, so that the throttle valve It is characterized by adjusting the opening of the valve.

This eliminates the need for troublesome wire cable wiring from the throttle grip to the throttle valve at the time of manufacturing and assembling, improves the workability of assembly, and eliminates the work of adjusting the wire cable.
Maintenance is also easy.

By adopting the electronically controlled throttle, the responsiveness of the throttle valve to the rotation of the throttle grip is improved, the fuel consumption can be improved, and the proper fuel can be supplied, which is also effective as a measure against exhaust gas. Become.

According to a second aspect of the invention, in the vehicle throttle device according to the first aspect, the sensor housing is fixed to a handlebar portion corresponding to an end portion of the throttle grip on the inner side in the vehicle width direction, and the contact is provided in the sensor housing. The contact type rotation angle sensor is configured by fixing the substrate and fixing the sliding contactor that contacts the contact substrate to the throttle grip.

When the contact type rotation angle sensor is adopted as described above, the rotation angle sensor can be arranged inexpensively and compactly by fixing the sliding contact to the throttle grip. Further, vibration of the throttle grip is suppressed by being gripped by an occupant, so that the influence of vibration from the handlebar to the rotation angle sensor is reduced and the sensor function can be maintained.

According to a third aspect of the present invention, in the vehicle throttle device according to the first aspect, the sensor housing is fixed to the handlebar portion corresponding to the inner end of the throttle grip in the vehicle width direction, and the exciting coil is attached to the sensor housing. Is fixed, and a substrate having a plurality of magnetic bodies facing each other with a gap provided between the exciting coils is fixed to the throttle grip to form a non-contact rotation angle sensor.

When the non-contact type rotation angle sensor is provided as described above, the vibration resistance is improved, and the sensor function is maintained without being affected by dust or water entering the sensor housing. You can

[0015]

First Embodiment FIG. 1 is a plan view of a handlebar of a motorcycle to which the present invention is applied. The handlebar 1 is a handle body 2 fixed to a front wheel steering shaft 4.
And a cylindrical pipe 3 fixed to the left and right ends of the handle body 1. The handle body 2 is provided with a front axle (not shown) via a pair of left and right front forks 5.
And is configured to rotate around the axis of the steering shaft 4 together with the front wheels. Although the basic structure of the entire motorcycle is well known, it does not need to be illustrated.
An engine is mounted on a vehicle body frame, front wheels and rear wheels are provided, the steering handlebar 1 is provided above the front wheels, and a fuel tank and a seat are provided above the vehicle body frame.

A handle grip 7 is fixed to the left cylindrical pipe 3, and a switch case 10 having a switch 8 for a direction indicator and a clutch lever 11 are attached. To the right cylindrical pipe 3, a throttle grip 15 is rotatably fitted, and a switch case 19 having a start switch 16 and a horn switch 17 and a brake lever 20 are attached. A rotation angle sensor 38 is arranged at an end portion on the inner side (left side) of the throttle grip 15 in the vehicle width direction, and the rotation angle sensor 38 is housed in a sensor housing 22 fixed to the right cylindrical pipe 3. A vibration-proof weight 21 is attached to the tip of each of the left and right cylindrical pipes 3.

A throttle body 24 of the fuel injection device is connected to an intake path from the air cleaner 28 to an intake port 29 of the engine, and a throttle valve 26 is rotatably arranged in an intake passage of the throttle body 24. ing. A rotary shaft 26a of the throttle valve 26 is interlocked with an output shaft of a throttle valve drive motor (stepping motor) 27 attached to the outside of the throttle body 24, and the throttle valve drive motor 27 rotates the throttle valve 26. It is designed to adjust the throttle opening. Although not shown, a return spring for urging the throttle valve 26 toward the closed position is mounted inside the throttle body 24.

The throttle valve drive motor 27 has a lead wire 3
Electronic control unit (ECU) 3 for the engine via
5 is connected to the electronic control unit 35, and the rotation angle sensor 38 is a pair of leads as in the engine condition measuring sensors such as a rotation speed sensor (not shown) and a temperature sensor (not shown). It is connected via lines 39 and 40.

FIG. 2 is an enlarged front view of the rotation angle sensor 38 shown with the sensor housing 22 cut (II in FIG. 3).
-II cross-sectional view), and in FIG. 2, the throttle grip 15 includes a cylindrical pipe 3 through a sleeve 41.
Is rotatably fitted to the outer periphery of the reel and has a reel 42 integrally formed on the inner (left) end face in the vehicle width direction. The reel 42 is a reel that is used as it is for winding the wire cable in the conventional wire cable system, and is housed in the sensor housing 22.

A return coil spring 45 is interposed between the reel 42 and the left end wall of the sensor housing 22 to bias the reel 42 toward the arrow C side (throttle closing side). One end of the return coil spring 45 engages with an engagement hole 50 formed in the reel 42 via an insulating material, and the other end engages with an engagement hole 51 formed in the left end wall of the sensor housing 22 via an insulating material. It engages and is connected to one rotation angle sensor lead wire 39.

The rotation angle sensor 38 of the present embodiment uses a contact type potentiometer. A contact substrate 55 is fixed to the inner surface of the left end wall of the housing 22 and a contact plate (left) protruding to the left end surface of the reel 42 ( The sliding contactor) 56 is fixed. The contact board 55 is connected to the remaining lead wire 40 for the rotation angle sensor, and the contact plate 56 is always in contact with the contact board 55 by its own elastic force and electrically connected to the other end of the return coil spring 45. It is connected to the one lead wire 39 via a return coil spring 45. A voltage of 5 V, for example, is loaded between the lead wires 39 and 40.

FIG. 4 is a right side view of the contact substrate 55. In the contact substrate 55, a hole 60 for inserting a cylindrical pipe is formed in the center, and an arc-shaped resistance plate 61 is arranged around the hole 60. The lead wire 40 is connected to one end of the resistance plate 61 on the arrow O side (throttle opening side). As shown in FIG. 5, the resistance plate 61 is insulated from the sensor housing 22 by the insulating layer 62, and is exposed in a pulse shape on the front side (right side) at a predetermined interval in the circumferential direction, and the contact plate 56 is exposed at the exposed portion. The tip is in contact.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2, in which the contact plate 56 rotates integrally with the throttle grip 15 around the grip shaft center, but the rotation range θ1 is the resistance plate 61 by a stopper mechanism (not shown). Is regulated within the circumferential range, and as the contact plate 56 rotates toward the arrow O side, the resistance value of the resistance plate 61 between the contact plate 56 and the lead wire 40 decreases.

In this embodiment, the program in the electronic control unit 35 is set so that the position Pm having the smallest resistance value is the maximum throttle opening position and the position P0 having the largest resistance value is the throttle minimum opening position. There is.

[0025]

In FIG. 3, the passenger grips the throttle grip 1
When 5 is not gripped, the contact plate 56 rotates in the direction of arrow C together with the throttle grip 15 by the urging force of the return coil spring 45, and is located at the throttle minimum open position P0 in FIG.

When the passenger grips the throttle grip 15 and rotates in the direction of arrow O, the contact plate 56 rotates in the direction of arrow O integrally with the throttle grip 15, and the resistance value of the resistance plate 61 decreases. The rotation angle is detected by the change in the current due to the decrease in the resistance value, and the rotation angle detection signal is sent to the electronic control unit 35 of FIG. 1 via the lead wires 39 and 40.

In the electronic control unit 35, a drive signal is sent to the stepping motor 27 based on the rotation angle detection signal, and the stepping motor 27 opens the throttle valve 26 according to the rotation angle of the throttle grip 15.

When the rotation angle sensor 38 is constructed by using the conventional wire cable type reel and housing as in the embodiment, the conventional throttle grip, housing and reel can be used as they are, and the parts management can be performed. And the manufacturing cost can be reduced.

[0029]

Second Embodiment of the Invention FIGS. 6 and 7 show another example in which a contact type potentiometer is used as a rotation angle sensor 38. In FIG. 6, a contact substrate 55 is provided on a cylindrical inner surface of a sensor housing 22. The contact plate 56 fixed to the left end surface of the reel 42 is brought into contact with the contact substrate 55 by projecting outwardly in the radial direction of the reel 42.

FIG. 7 is a perspective view of the contact substrate 55. The resistance plate 61 is exposed in a pulse shape on the radially inner peripheral surface at predetermined intervals in the peripheral direction. The other structure is similar to that of FIGS. 2 and 3, and the same parts are denoted by the same reference numerals. The operation is also the same as in the case of FIGS.

[0031]

Third Embodiment of the Invention FIGS. 8 and 9 show a non-contact type rotation angle sensor 38 utilizing an exciting coil 70 and a plurality of magnetic bodies 71. In FIG. 8, a reel for wire cables is not provided at the left end of the throttle grip 15, a flange 71 for board placement is fixed, and a board 73 is fixed to the left end surface of the flange 71.
A plurality of magnetic bodies 74 are installed on the same circumference of the substrate 73.

The exciting coil 70 is opposed to the magnetic body 74 from the left with a gap therebetween and is fixed to the left end wall of the sensor housing 22. The pair of lead wires 3
It is connected to the electronic control unit 35 via 9, 40.

FIG. 9 shows a left side view of the substrate 73,
The plurality of magnetic bodies 74 arranged on the same circumference are configured such that the magnetic force gradually increases as one goes in the circumferential direction, for example, toward the throttle closing side (arrow C side).

When the substrate 73 is rotated in the direction of the arrow O by rotating the throttle grip 15 in the direction of the arrow O in FIG. 8, the magnetism facing the exciting coil 70 located in the exciting coil fixing position Ps in FIG. The body 74 is gradually replaced with one having a large magnetic force, and the induced current generated in the exciting coil 70 increases. The rotation angle detection signal detected by the change in the current is sent to the electronic control unit 35, and the stepping motor 27 opens the throttle valve 26 according to the rotation angle of the throttle grip 15.

[0035]

Other Embodiments (1) FIGS. 2 and 3 and 6
Further, in the contact type rotation angle sensor as shown in FIG. 7, it is possible to provide a contact board on the throttle grip side, a contact plate on the sensor housing, and rotate the contact board together with the throttle grip.

(2) In the rotation angle sensor shown in FIGS. 2 and 3 and FIGS. 6 and 7, the reel used in the conventional wire cable system is used as it is, but as shown in FIG. 8, the flange for attaching the contact plate is used. It is also possible to have a structure in which

(3) In FIG. 1, the invention is applied to an engine having a throttle body of a fuel injection device, but it is also possible to apply to an engine having a carburetor.

(4) The vehicle to which the invention of the present application is applied is not limited to a motorcycle, and is equipped with an engine and a handlebar, such as a snowmobile, a small water slide boat, or a four-wheeled all-terrain vehicle on which riding is carried, and a handlebar. It can be applied to a vehicle having a throttle grip rotatably provided at the end of the bar.

[0039]

As described above, according to the present invention,
By adopting the electronically controlled throttle system, the responsiveness of the throttle valve to the operation of the throttle grip is improved, the fuel efficiency is improved, and it is effective not only in exhaust gas countermeasures, but also has the following advantages. is doing.

(1) Since the rotation angle sensor is arranged at the end of the throttle grip provided on the handlebar, and the rotation angle sensor and the throttle valve drive motor are connected to the electronic control unit by the lead wire, the conventional wire is used. Unlike the cable type, wire cable wiring from the throttle grip to the throttle valve or the electronic control unit is not required, and the assembling workability is improved. Further, the operation force of the throttle grip does not become heavy unlike the case of the wire cable system.

(2) Since the rotation angle of the throttle grip is directly detected by the rotation angle sensor and the throttle opening is adjusted based on the detected rotation angle, the tension of the wire cable is adjusted as in the conventional wire cable type. Maintenance is easy.

(3) The handlebar is a member that generates a relatively large amount of vibration during traveling, but the throttle grip is a member provided on the handlebar, but vibration is suppressed by being gripped by the passenger. Therefore, FIG. 2 and FIG.
When a contact type rotation angle sensor is provided as in the above, the rotation angle sensor is arranged at the end of the throttle grip and the contact plate (contactor) is fixed to the throttle grip. Vibration is blocked and the sensor function can be prevented from degrading. Also, the rotation angle sensor can be compactly arranged.

(4) When the non-contact type rotation angle sensor is provided as shown in FIG. 8, the vibration resistance is improved, and the sensor housing is not affected by dust or water entering the sensor housing. The function can be maintained.

[Brief description of drawings]

FIG. 1 is a plan view of a handlebar showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional front view of the rotation angle sensor of FIG.
II-II cross-sectional view).

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a right side view of the contact board.

5 is an enlarged view of VV cross section of FIG. 4. FIG.

FIG. 6 is a vertical sectional front view showing a modified example of the contact-type rotation angle sensor.

7 is a perspective view of the contact substrate of FIG.

FIG. 8 is a vertical sectional front view of a non-contact rotation angle sensor.

9 is a left side surface of the substrate of FIG.

[Explanation of symbols]

1 handlebar 15 Throttle grip 22 Sensor housing 24 Throttle body 26 Throttle valve 27 Throttle valve drive motor (stepping motor) 35 Electronic control unit 38 Rotation angle sensor 39,40 Lead wire 42 reel 45 Return coil spring 55 contact board 56 Contact plate (slider) 61 Resistance plate 70 Excitation coil 73 substrate 74 Magnetic

Claims (3)

[Claims] 1. A throttle device for a vehicle, comprising an engine and a steering handlebar, wherein a throttle grip is rotatably provided at one end of the handlebar, the throttle device being disposed in an intake path of the engine. The throttle valve drive motor is linked to the valve, and the rotation angle sensor that detects the rotation angle of the throttle grip is placed at the end of the throttle grip inside the vehicle width direction.The rotation angle sensor and the throttle valve drive motor are connected by the lead wire. A throttle device for a vehicle, which is connected to an electronic control unit and adjusts an opening of a throttle valve by rotating a throttle valve drive motor based on a rotation angle detection signal from a rotation angle sensor. 2. A throttle grip is provided with a sensor housing fixed to a handlebar portion corresponding to an end portion of the throttle grip on the inner side in the vehicle width direction, a contact substrate fixed to the sensor housing, and a sliding contact which contacts the contact substrate. The vehicle throttle device according to claim 1, wherein a contact-type rotation angle sensor is configured by being fixed to the throttle device. 3. A sensor housing is fixed to a handlebar portion corresponding to an end of the throttle grip on the inner side in the vehicle width direction, an exciting coil is fixed to the sensor housing, and a plurality of magnets facing each other with a gap between the exciting coils. The vehicle throttle device according to claim 1, wherein a non-contact rotation angle sensor is configured by fixing a substrate having a body to a throttle grip.