JPH04358731A - Accelerator operating device - Google Patents

Abstract

PURPOSE:To eliminate the detection error and improve the detection precision by detecting the stepping ON quantity of an accelerator pedal on the accelerator pedal side, not on the throttle valve side, and detecting the stepping ON quantity by an acceleration sensor on the basis of the turning angle of a sensor shaft in the amplification of the stepping ON quantity. CONSTITUTION:When an accelerator pedal 14 is stepped ON, a pedal rod 13 turns around an accelerating shaft 12 against a return spring 15, and the accelerating shaft 12 and a cam plate 16 turn. Accordingly, a cam lever 20 connected with the top edge of the cam plate 16 turns through a roller 21. At this time, the turning angle of the cam plate 16, i.e., the turning angle of the pedal rod 13 which corresponds to the step ON quantity of the accelerator pedal 14 is amplified and transmitted to a sensor shaft 17. The turn of the sensor shaft 17 is detected by an acceleration sensor 19 through a sensor lever 18. Accordingly, the acceleration sensor 19 detects the amplified large turning angle, and controls the opening and closing of a throttle valve.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accelerator operating device that opens and closes an engine throttle by detecting the amount of depression of an accelerator pedal using an opening sensor.

0002

[Prior Art] Conventionally, this type of device has been
Publication No. 3-140832 or JP-A-63-38627
There is something described in the publication.

The device described in JP-A-63-140832 uses an accelerator sensor to detect the rotation angle of a throttle shaft attached to a throttle body and connected to an accelerator pedal by a wire, and performs stepping based on the detected signal. The motor is driven to open and close the throttle valve, and the opening degree of the throttle valve is detected by a throttle sensor.

Furthermore, as shown in FIG. 7, the device described in Japanese Patent Application Laid-Open No. 63-38627 has an accelerator operation position sensor (accelerator sensor) directly attached to an accelerator pedal rod 2 that is rotated by depression of the accelerator pedal 1. 3 is attached to detect the rotation angle of the accelerator pedal rod 2, that is, the depression angle of the accelerator pedal 1. Based on the detected value, a pulse motor (stepping motor) 4 is driven, and the links 5a, A throttle valve (throttle) 6 is opened and closed via the throttle valves 5b and 5c, and the opening degree of the throttle valve 6 is detected by a throttle valve opening sensor (throttle sensor) 7.

[0005]

[Problems to be Solved by the Invention] However, among the above-mentioned conventional techniques, the former one described in Japanese Patent Application Laid-Open No. 140832/1983 is based on an accelerator sensor that detects the amount of depression of the accelerator pedal and the opening degree of the throttle valve. Since the throttle sensors that detect this are both located close to each other on the throttle body side, there is a risk that abnormalities may occur in the detected values of both sensors at the same time due to the effects of vibration, etc. be. Another problem is that the throttle body becomes large.

[0006] Furthermore, in the latter Japanese Patent Application Laid-Open No. 63-38627, the amount of depression of the accelerator pedal 1 is directly detected from the rotation angle of the axis of the accelerator pedal rod 2; Since the corresponding axis rotation angle of the accelerator pedal rod 2 is relatively small,
Errors are likely to occur in the detected value, and this detected value must be amplified electrically, so highly accurate detection cannot be expected. It is difficult to adapt. It is also necessary to install an amplifier.

The present invention has been made in order to eliminate the drawbacks of the conventional accelerator operating device described above.

That is, an object of the present invention is to provide an accelerator operating device that can detect the amount of depression of an accelerator pedal with high precision.

[0009]

[Means for Accomplishing the Objects] In order to achieve the above object, the present invention includes a pedal rod connected to an accelerator pedal, an accelerator shaft connected to the pedal rod and rotatably supported by a support member, and an accelerator shaft connected to the pedal rod and rotatably supported by a support member. a sensor shaft rotatably supported by a support member separately from the accelerator shaft;
A rotation angle amplification mechanism is interposed between the sensor shaft and the accelerator shaft and amplifies the rotation angle of the sensor shaft relative to the rotation angle of the accelerator shaft and transmits the amplified rotation angle to the sensor shaft. The vehicle is characterized by comprising an accelerator sensor fixed to the support member.

The rotation angle amplifying mechanism includes a cam plate having a base end fixed to the accelerator shaft and extending in the radial direction of the accelerator shaft, and a cam plate having another base end fixed to the sensor shaft and extending in the radial direction of the sensor shaft. The sensor shaft has a cam lever that extends from the cam lever and has a distal end connected to the distal end of the cam plate, and the rotation angle of the sensor shaft relative to the rotation angle of the accelerator shaft can be amplified by setting the cam plate to be longer than the cam lever.

[0011]

[Operation] In the above accelerator operating device, when the accelerator pedal is depressed, the pedal rod rotates around the accelerator shaft. This rotation of the accelerator shaft is amplified by the rotation amplification mechanism and transmitted to the sensor shaft, whereby the sensor shaft is rotated by a larger angle than the amplified accelerator shaft.

[0012] Therefore, the accelerator sensor can detect a rotation angle that is amplified and larger than the actual amount of depression of the accelerator pedal, and can control the opening and closing of the throttle valve based on this detected value.

[0013] When the rotation amplification mechanism is constituted by a link mechanism using a cam plate and a cam lever, the ratio of the axial lengths of the cam plate and the cam lever becomes the amplification factor of the rotation angle.

Furthermore, by making the connection position of the cam lever to the cam plate not constant but variable as the cam plate rotates, various characteristics can be obtained between the amount of depression of the accelerator pedal and the throttle opening. I can do it.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on embodiments shown in the drawings.

In FIGS. 1 and 2, a pedal shaft 12 is rotatably supported laterally at the lower end of a bracket 11 fixed to the floor of the driver's seat.
A pedal rod 13 extending in the vertical direction is fixed to 2, and an accelerator pedal 14 is attached to the lower end of this pedal rod 13. When the accelerator pedal 14 is depressed, the pedal rod 13 rotates around the pedal shaft 12. It looks like this. A return spring 15 whose center is inserted through the pedal shaft 12 is interposed between the pedal rod 13 and the bracket 11, and biases the pedal rod 13 in the counterclockwise direction in FIG. .

A base end portion of a cam plate 16 as particularly shown in FIG. 3 is fixed to the left end side of the pedal shaft 12 in FIG. 1, and is designed to rotate integrally with the pedal shaft 12. There is.

A sensor shaft 17 is rotatably supported by the bracket 11 above the pedal shaft 12 on the near side of the pedal rod 13, and a sensor lever 18 is attached to one end of the sensor shaft 17 (the left end in FIG. 1). The accelerator sensor 1 attached to the bracket 11 is fixed to rotate integrally with the sensor lever 18.
9 is activated.

One end of a cam lever 20 is fixed to the sensor shaft 17 at a position close to the cam plate 16 so as to rotate integrally therewith, and a roller 21 attached to the base end of the cam lever 20 is cam plate 16
is fitted into the contact surface 16a formed inside the tip of the
The cam lever 20 rotates in conjunction with the rotation of the cam plate 16, thereby rotating the sensor shaft 17. Further, a return spring 22 is interposed between the sensor shaft 17 and the bracket 11 with its center inserted through the sensor shaft 17, and biases the sensor shaft 17 in the counterclockwise direction in FIG. are doing.

Here, the cam plate 16 and the cam lever 2
0, the ratio of the distance l1 between the center of the accelerator shaft 12 and the center of the roller 21 to the distance l2 between the center of the roller 21 and the center of the sensor shaft 17 is 4. :1 (see Fig. 3) In Figs. 1 to 3, 23 is a cable lever whose one end is rotatably attached to the accelerator shaft 12, and 23A is a cable lever whose other end is attached to the accelerator shaft 12. An engaging portion 24 is connected to the other end of the cable lever 23 and engages with the pedal rod 13 to integrally rotate the cable lever 23 when the pedal rod 13 rotates beyond a predetermined angle. The accelerator cable, 25 is a stopper that comes into contact with the cable lever 23 to provide a play α between it and the pedal rod 13, and 26 is a throttle valve.

In the above accelerator operating device, when the accelerator pedal 14 is depressed, the pedal rod 13 rotates around the accelerator shaft 12 against the return spring 15, thereby causing the accelerator shaft 12 and the cam plate 16 to move as shown in FIG. Rotate in the direction of arrow X. The rotation of the cam plate 16 causes the cam lever 20 connected to the tip of the cam plate 16 via the roller 21 to rotate in the same direction.

At this time, since the ratio of l1 to l2 is 4 to 1, the ratio of the rotation angle θ1 of the cam plate 16 to the rotation angle θ2 of the cam lever is 1 to 4, and the rotation of the cam plate 16 is The movement angle, that is, the rotation angle of the pedal rod 13 corresponding to the amount of depression of the accelerator pedal 14 is amplified four times and transmitted to the sensor shaft 17.

The rotation of the sensor shaft 17 is detected by the accelerator sensor 19 via the sensor lever 18. Therefore, the accelerator sensor 19 can detect a large turning angle that is four times amplified than the actual amount of depression of the accelerator pedal 14, and can control the opening and closing of the throttle valve 26 based on this detected value. I can do it.

[0024] Note that the amplification value of this rotation angle is l1 versus l2
It can be set arbitrarily by setting the ratio arbitrarily.

Here, in the above embodiment, the roller 2
Even if the cam plate 16 rotates, the contact surface 16a formed at the tip of the cam plate 16 to which 1 fits
Although the ratio of 2 does not change, the contact surface 16a
By changing the shape of the accelerator sensor, the output characteristics of the accelerator sensor can be changed with respect to the accelerator opening degree. Also,
As shown in FIG. 5, the roller 21 moves within the cam surface 16'a as the plate 16 rotates with the portion 16'b of the cam surface 16'a in contact with the roller 21 as an inclined surface.
It is also possible to vary the ratio of l1 to l2.

For example, as shown by the dashed line in FIG. 5, the roller 21 moves into the recess 16 as the cam plate 16' rotates.
By moving to the back side of 'a' and decreasing the ratio of l1 to l2, the characteristics of the output of the accelerator sensor 19 and the throttle opening are changed from those of the embodiment of FIG. 4, as shown in FIG. In contrast to the straight line A in the case, the characteristic can be as shown in the curve B.

In addition, in FIGS. 4 and 5, the cam plate 1
The reason why the tips of the tips 6 and 16' are shaped like a key is that if the spring that biases the shaft 17 breaks, the cam lever 20 will be hooked on the key-shaped portion to return the sensor to the closed side.

[0028]

As described above, according to the present invention, since the amount of depression of the accelerator pedal is detected on the accelerator pedal side rather than on the throttle valve side, the accelerator sensor detects the amount of depression of the accelerator pedal and the throttle opening is detected. There is no risk of an error occurring in the detected value of the throttle sensor at the same time, and since the accelerator sensor detects the amount of depression of the accelerator pedal using the rotation angle of the sensor shaft that is amplified compared to the actual amount of depression, the detection error is small. Furthermore, since there is no need to amplify the detected value using an amplifier, highly accurate detection can be performed.

Furthermore, by making the amplification value of the rotation transmission from the accelerator shaft to the sensor shaft variable as the accelerator shaft rotates, the detection of the rotation angle on the sensor shaft side can be made different from the rotational characteristics of the accelerator shaft side. It becomes possible to detect with the characteristics.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention;

[Fig. 2] Side view of the same embodiment,

FIG. 3 is a partial cross-sectional view taken along line III-III in FIG. 1;

FIG. 4 is a partially enlarged view showing the connecting portion between the cam plate and the cam lever in the same embodiment;

FIG. 5 is a partially enlarged view showing another embodiment of the connection portion between the cam plate and the cam lever;

FIG. 6 is a characteristic diagram between the accelerator sensor output and the throttle opening according to the embodiments of FIGS. 4 and 5;

[Fig. 7] Perspective view showing a conventional example

[Explanation of symbols]

12...Accelerator shaft 13...Pedal rod 14...Accelerator pedal 16...Cam plate 16a...Abutment surface 17...Sensor shaft 19...Accelerator sensor 20...Cam lever 21...roller

Claims (2)

[Claims] 1. A pedal rod connected to an accelerator pedal; an accelerator shaft connected to the pedal rod and rotatably supported by a support member; a sensor shaft rotatably supported by a support member separately from the accelerator shaft; A rotation angle amplification mechanism that is interposed between the sensor shaft and the accelerator shaft and amplifies the rotation angle of the sensor shaft relative to the rotation angle of the accelerator shaft and transmits the amplified rotation angle to the sensor shaft, and a rotation angle amplification mechanism that detects and supports the rotation angle of the sensor shaft. An accelerator operating device comprising: an accelerator sensor fixed to a member. 2. The rotation angle amplification mechanism includes a cam plate having a base end fixed to the accelerator shaft and extending in the radial direction of the accelerator shaft, and a cam plate having another base end fixed to the sensor shaft and extending in the radial direction of the sensor shaft. 2. The accelerator operating device according to claim 1, further comprising a cam lever extending from the cam lever and having a distal end connected to the distal end of the cam plate, and wherein the cam plate is set longer than the cam lever.