JP3189150B2 - Accelerator operation device - Google Patents

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 for opening and closing an engine throttle by detecting the amount of depression of an accelerator pedal by an opening sensor.

[0002]

2. Description of the Related Art An apparatus of this type has conventionally been disclosed in
JP-A-3-140832 or JP-A-63-38627
There is one described in Japanese Patent Publication No.

The device described in Japanese Patent Application Laid-Open No. 63-140832 detects a rotation angle of a throttle shaft attached to a throttle body and connected to an accelerator pedal by a wire using an accelerator sensor, and performs stepping based on the detected signal. The motor is driven to open and close the throttle valve, and the opening of the throttle valve is detected by a throttle sensor.

Further, as shown in FIG. 7, an apparatus disclosed in Japanese Patent Application Laid-Open No. 63-38627 directly operates an accelerator pedal position sensor (accelerator sensor) on an accelerator pedal rod 2 which is rotated by depressing an accelerator pedal 1. 3, a rotation angle of the accelerator pedal rod 2, that is, a depression angle of the accelerator pedal 1, is detected, and a pulse motor (stepping motor) 4 is driven based on the detected value, and a link 5a, The throttle valve (throttle) 6 is opened and closed via 5b and 5c, and the opening of the throttle valve 6 is detected by a throttle valve opening sensor (throttle sensor) 7.

[0005]

However, among the above-mentioned prior arts, the former disclosed in Japanese Patent Application Laid-Open No. 63-140832 discloses an accelerator sensor for detecting the amount of depression of an accelerator pedal and an opening degree of a throttle valve. And the throttle sensor for detecting the both are arranged at positions close to each other on the throttle body side, so that there is a possibility that abnormalities occur in the detection values of both sensors simultaneously due to the influence of vibration and the like. is there. Also, there is a problem that the throttle body becomes large.

In the latter Japanese Unexamined Patent Publication No. 63-38627, the depression amount of the accelerator pedal 1 is directly detected from the shaft rotation angle of the accelerator pedal rod 2. Since the corresponding rotation angle of the accelerator pedal rod 2 is relatively small,
Since the detected value is likely to have an error, and the detected value must be electrically amplified, high-precision detection cannot be expected, and the accelerator pedal depression amount and the throttle opening are one-to-one. It is difficult to correspond. In addition, it is necessary to mount an amplifier.

[0007] The present invention has been made to solve the disadvantages of the conventional accelerator operating device.

That is, an object of the present invention is to provide an accelerator operating device capable of detecting the amount of depression of an accelerator pedal with high accuracy.

[0009]

In order to achieve the above object, the present invention provides 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 for transmitting to the sensor shaft sensor shaft and is interposed between the axle shaft and amplifies the rotation angle of the axle shaft, fixed to the support member and detects the rotation angle of the sensor shaft An accelerator sensor is provided.

The rotation angle amplifying mechanism includes a cam plate having a base end fixed to the accelerator shaft and extending in a radial direction of the accelerator shaft, and a cam base having another base end fixed to the sensor shaft and having a base end fixed to the sensor shaft. has extending a cam lever tip portion is connected to the distal end portion of the cam plate, the amplification of the rotation angle of the sensor shaft with respect to the rotation angle of the axle shaft, intends row by setting longer than cam lever the cam plate.

[0011]

When the accelerator pedal is depressed, the pedal rod rotates about the accelerator shaft. The rotation of the accelerator shaft is amplified by the rotation amplifying mechanism and transmitted to the sensor shaft, whereby the sensor shaft is rotated by a larger angle than the amplified accelerator shaft.

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

Here, the rotation amplifying mechanism is constituted by a link mechanism including a cam plate and a cam lever .
Thus , the ratio between the cam plate and the cam lever shaft length is the amplification factor of the rotation angle.

In addition, various characteristics can be obtained between the amount of depression of the accelerator pedal and the throttle opening by making the connection position of the cam lever to the cam plate not constant but variable with the rotation of the cam plate. Can be done.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.

In FIG. 1 and FIG. 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 vertically is fixed to 2, and an accelerator pedal 14 is attached to a lower end of the pedal rod 13. When the accelerator pedal 14 is depressed, the pedal rod 13 rotates about the pedal shaft 12. It has become. A return spring 15 is inserted between the pedal rod 13 and the bracket 11, the center of which is inserted through the pedal shaft 12, and urges the pedal rod 13 counterclockwise in FIG. 2. .

A base end of a cam plate 16 as particularly shown in FIG. 3 is fixed to the pedal shaft 12 at the left end side in FIG. 1 so that the cam shaft 16 rotates integrally with the pedal shaft 12. I have.

A sensor shaft 17 is rotatably supported by the bracket 11 at a position above the pedal shaft 12 in front of the pedal rod 13, and a sensor lever 18 is provided at one end (the left end in FIG. 1) of the sensor shaft 17. The accelerator sensor 1 attached to the bracket 11 is fixed by the sensor lever 18 so as to rotate integrally.
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. A roller 21 attached to the base end of the cam lever 20 is Cam plate 16
Is fitted to the contact surface 16a formed inside the tip of
The cam lever 20 rotates in conjunction with the rotation of the cam plate 16, and the sensor shaft 17 rotates. 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 counterclockwise in FIG. are doing.

Here, the cam plate 16 and the cam lever 2
In the link mechanism (rotation angle amplifying mechanism) constituted by 0, the ratio of the distance l1 between the center of the accelerator shaft 12 and the center of the roller 21 and the distance l2 between the center of the roller 21 and the center of the sensor shaft 17 is 4 1 to 3 (see FIG. 3). In FIGS. 1 to 3, reference numeral 23 denotes a cable lever having one end rotatably attached to the accelerator shaft 12, and 23A denotes a cable lever at the other end of the cable lever 23. When the pedal rod 13 is turned by a predetermined angle or more, an engaging portion that engages with the pedal rod 13 to turn the cable lever 23 integrally is provided. The engaging portion 24 is connected to the other end of the cable lever 23. An accelerator cable 25 is a stopper for contacting the cable lever 23 to provide a play α with the pedal rod 13, and a throttle valve 26 is provided.

In the accelerator operating device, when the accelerator pedal 14 is depressed, the pedal rod 13 rotates about the accelerator shaft 12 against the return spring 15, whereby the accelerator shaft 12 and the cam plate 16 of FIG. It turns 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: 1, the ratio of the rotation angle θ1 of the cam plate 16 to the rotation angle θ2 of the cam lever is 1: 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 depression amount 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 an accelerator sensor 19 via a sensor lever 18. Therefore, the accelerator sensor 19 can detect a large rotation angle which is four times as large as the actual depression amount of the accelerator pedal 14, and can control the opening and closing of the throttle valve 26 based on the detected value. I can do it.

The amplification value of the rotation angle can be set arbitrarily by setting the ratio of l1 to l2 arbitrarily.

Here, in the above embodiment, the roller 2
The contact surface 16a formed at the distal end of the cam plate 16 into which the first plate 1 fits is provided so that the contact surface 16a is
However, the output characteristics of the accelerator sensor can be changed with respect to the accelerator opening by changing the shape of the contact surface 16a. Further, as shown in FIG. 5, the roller 16 moves within the cam surface 16'a as the plate 16 rotates, with the portion 16'b of the cam surface 16'a that the roller 21 abuts on as an inclined surface. l
The ratio of 1 to l2 can be varied.

For example, as shown by a dashed line in FIG.
By moving to the rear side of 6'a and decreasing the ratio of l1 to l2, the characteristics of the output of the accelerator sensor 19 and the throttle opening can be changed as shown in FIG. Is a straight line A, whereas a characteristic like a curve B can be obtained.

4 and 5, the cam plate 1
The reason why the shape of the distal end portions of 6, 6 'is key-shaped is that when the spring for urging the shaft 17 is broken, the cam lever 20 is hooked at the key-shaped portion to return the sensor to the closed side.

[0028]

As described above, according to the present invention, the depression amount of the accelerator pedal is detected not on the throttle valve side but on the accelerator pedal side. Therefore, the accelerator sensor for detecting the depression amount of the accelerator pedal and the throttle opening are detected. There is no risk that an error may occur in the detection values of the throttle sensor at the same time, and the accelerator sensor detects the depression amount of the accelerator pedal based on the rotation angle of the sensor shaft amplified from the actual depression amount, so that the detection error is small. In addition, since it is not necessary to amplify the detection value by the amplifier, highly accurate detection can be performed.

Further, the amplification value of the rotation transmission from the accelerator shaft to the sensor shaft is made variable with the rotation of the accelerator shaft, so that the detection of the rotation angle on the sensor shaft side differs from the rotation characteristics on the accelerator shaft side. It becomes possible to detect with the characteristic.

[Brief description of the drawings]

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

FIG. 2 is a side view of the embodiment,

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

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

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

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

FIG. 7 is a 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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-38627 (JP, A) JP-A-2-224286 (JP, A) JP-A-63-140832 (JP, A) JP-A-61-1986 53228 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02D 41/04 310 F02D 11/10

Claims (1)

(57) [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, and It is interposed between the sensor shaft and the axle shaft
A rotation angle amplification mechanism for transmitting to the sensor shaft by amplifying the rotation angle of the axle shaft, comprising an accelerator sensor which is fixed to the support member and detects the rotation angle of the sensor shaft, the rotation angle amplification mechanism , the tip extends and a cam plate extending in the radial direction of the axle shaft proximal end is fixed to the accelerator shaft, another base end portion is fixed to the sensor shaft in a radial direction of the sensor shaft cam and a cam lever which is connected to the distal end portion of the plate, this
An accelerator operating device cam plate is characterized in that it is longer than this cam lever.