JPH09236029A - Accelerator operation resistance generating device - Google Patents

Abstract

PURPOSE: To generate frictional resistance at rotating time, and add resistance force to accelerator operation by installing a cam whose outside peripheral surface is formed as a friction cam surface on a rotary shaft, and elastically butting a push-pressing member against the friction cam surface. CONSTITUTION: When an accelerator pedal 20 is stepped, an accelerator lever 14 and a rotary shaft 9 integrally formed with this rotate in the clockwise direction. At this time, a push-pressing member 31 butted against a friction cam surface 27 by a spring load of a compression spring 34 imparts frictional resistance proceeding backward in rotation to a cam 25. Since the friction cam surface 27 rotates in the direction for compressing this by opposing a spring load of the compression spring 34 in a butting place, frictional resistance is large, and this increases stepping force of the accelerator pedal 20. As a result, even in an automobile mounted with an electric transmission system, accelerator operation can be performed with stepping force in the same degree as a mechanical transmission system using a huge wire cable without a sense of incompatibility.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accelerator operation resistance generating device in a system for driving an engine output control device in accordance with a driver's accelerator operation amount.

[0002]

2. Description of the Related Art In a gasoline engine, by opening and closing an intake throttle valve, and in a diesel engine, by rotating a plunger of an injection pump,
Controlling the engine output is a very common technology. Then, these output control devices installed in the engine room are connected by an accelerator pedal installed at the foot of the driver's seat of the automobile with a wire cable, and are driven according to the accelerator operation amount of the driver, Due to the layout of the engine and the intake pipe in the engine room, the wire cable has a considerable length and is arranged along a guide such as a pipe so as to reciprocate on a predetermined path.

On the other hand, in an automobile equipped with a gasoline engine, the intake throttle valve is opened and closed by an electric or negative pressure type actuator instead of mechanically transmitting the accelerator operation to the intake throttle valve using only a wire cable. An electric transmission method has been developed in which an accelerator operation amount is converted into an electric signal to operate an actuator.

In this system for electrically transmitting the accelerator operation to the intake throttle valve, an accelerator sensor using a potentiometer that changes the electric resistance value in proportion to the accelerator operation amount is installed near the accelerator pedal, and these are connected to a wire cable. It is configured to be connected with.

The accelerator sensor, like the opening degree sensor of the intake throttle valve, has a slider attached to the rotary shaft in the radial direction and a strip-shaped resistor in which the slider slides on an arc centered on the rotary shaft. Is fixedly arranged, a fixed reference voltage is applied to both ends of the strip-shaped resistor to obtain a divided voltage corresponding to the position from the slider, and an output voltage proportional to the accelerator operation amount is taken out. A wire cable extending from the accelerator pedal is connected to an accelerator lever fixed to a rotary shaft, and the wire cable extending from the accelerator pedal is connected to a predetermined control device. The rotation axis is rotated at a rotation angle proportional to the amount of depression.

[0006]

A system for electrically transmitting the above-mentioned accelerator operation to the intake throttle valve by using an accelerator sensor and an actuator is a wire cable compared to a system for mechanically transmitting only the wire cable. Is significantly shorter, and the resistance of the wire cable to the depression of the accelerator pedal is significantly smaller.

Therefore, when a driver familiar with a mechanical transmission system drives a vehicle equipped with such an electrical transmission system, the pedaling force of the accelerator pedal is remarkably reduced, and the driver does not step on unnecessarily. This may cause inconveniences such as acceleration resulting in an accident and hesitating to impair drivability.

Further, even in the mechanical transmission system in which the accelerator pedal and the valve shaft of the intake throttle valve are connected by a wire cable, the intake throttle valve may be arranged closer to the accelerator pedal than in the conventional case depending on the layout in the engine room. It is expected that the wire cable will be short in this case as well, and the pedaling force of the accelerator pedal will be reduced, causing the same inconvenience as described above. This means
This occurs even when the wire cable is shortened in a diesel engine that adjusts an injection pump, and fuel is increased more than necessary.

Therefore, in the present invention, the accelerator operation of the driver is transmitted to the rotary shaft of the accelerator sensor or the valve shaft of the intake throttle valve or the rotary shaft of the plunger of the injection pump via the wire cable of a short length, and the intake throttle valve is transmitted. When driving the injection pump or the injection pump indirectly or directly, by applying a resistance force to the accelerator operation, the accelerator pedal depressing force equivalent to that of the system using the conventional long wire cable is applied, and the accelerator operation can be performed without discomfort. It seeks to provide the means by which it can be done.

[0010]

A rotary shaft for indirectly or directly driving an output control device of an engine and an accelerator pedal are connected by a wire cable, and the rotary shaft rotates according to an accelerator operation amount. In order to solve the above-mentioned problems caused when the wire cable is short in the device drive mechanism, the present invention has been made as follows.

That is, a cam having an outer peripheral surface formed as a friction cam surface is attached to the rotary shaft, and a pressing member is elastically abutted against the friction cam surface to generate friction resistance during rotation. Is.

In this means, it is preferable that the friction cam surface is formed into a circular shape concentric with the rotating shaft, and the pressing member is arranged obliquely with respect to the cam normal line passing through the abutting point in the direction of the rotational reduction of the rotating shaft. Is. Alternatively, it is also preferable that the friction cam surface is a curved surface having a large diameter in the direction of the output increasing rotation of the rotating shaft, and the pressing member is arranged on the normal line of the rotating shaft.

Further, in these, the pressing member, the compression spring, and the adjusting screw are incorporated in the guide tube, and the pressing member is caused to abut against the friction cam surface by the compression spring whose spring load is adjustable by the adjusting screw. It is convenient to use a resistor unit.

[0014]

[Function] When the accelerator pedal is depressed to rotate the rotary shaft, a frictional resistance is generated between the friction cam surface and the pressing member, which acts as resistance against the pedaling force and is the same as when the wire cable is long. It requires power and allows the accelerator to be operated without discomfort. When the pressing member is obliquely arranged or when the friction cam surface is non-circular, the frictional resistance at the time of accelerator return is small and the response of output reduction is good.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a rotary shaft of an accelerator sensor in an automobile equipped with a gasoline engine will be described with reference to the drawings. Mainly referring to FIGS. Accelerator sensor 7 with built-in strip resistor
The housing 8 is provided on one pillar portion 5 of the inverted gate-shaped base 4, the rotary shaft 9 having the slider attached thereto is extended to penetrate the other pillar portion 6, and the protruding end portion thereof will be described later. An accelerator operation resistance generating means is provided to handle these as an integrated product.

The accelerator sensor unit 3 is fixed to the floor 4 of the automobile or other structural portion 1 with a base 4 and fixed by screws 2. The accelerator sensor unit 3 is installed near the accelerator pedal 20, for example, in the interior of the automobile.

A portion of the rotary shaft 9 between the housing 8 and the column portion 6 is covered with a collar 10 made of synthetic resin, and an arm member 15 extending from a fan-shaped accelerator lever 14 on one side of the collar 10 is attached to the rotary shaft 9. The accelerator wire 1 is fixedly attached to the arc-shaped guide groove 16 centered on the rotation shaft 9.
9 are fitted and fixed to each other at the tips. The base end of the accelerator wire 19 is engaged with the accelerator pedal 20, and when the driver depresses the accelerator pedal 20, the accelerator lever 14 rotates clockwise in FIG. 1, and the rotary shaft 9 rotates integrally with the accelerator lever 14. The slider attached to the slider slides on the strip-shaped resistor, and an output voltage proportional to the accelerator operation amount is taken out.

The electric signal and the reference voltage are output or input through the terminal 12 provided in the housing 8. Further, a return spring 17 for rotating the accelerator lever 14 and the rotary shaft 9 in the opposite direction when the accelerator pedal 20 is returned is provided around the collar 10, and the intake throttle valve is set to the idle position. A positioning member 18 for accurately stopping at the fully opened position is aligned with the arm member 15 and fixed to the rotary shaft 9.

The means of the present invention for imparting resistance to the rotary shaft 9 and requiring the pedaling force of the accelerator pedal 20 to the same extent as in the case of a long wire cable is the column portion 6 of the rotary shaft 9.
It has a cam 25 fitted and fixed to the protruding end portion from and a resistor unit 29 fixed to the pillar portion 6.

On the outer peripheral surface of the cam 25, a friction member 26 having a high frictional force and abrasion resistance, which is generally used as a brake material, has an arc range corresponding to at least the entire rotation angle of the rotary shaft 9, as shown in the drawings. In the example, they are laminated over the entire circumference, and the surface thereof forms the friction cam surface 27.

In the resistor unit 29, a piston-piston rod-shaped pressing member 31 is axially movably fitted to a guide tube 30 on the cylinder so that the piston rod portion protrudes from one end surface of the guide tube 30. An adjustment screw 32 fixed to an arbitrary position by a lock nut 33 is screwed on the other end face side, and a coil-shaped compression spring 34 is inserted between the pressing member 31 and the adjustment screw 32. Guide tube 30
Is attached to the pillar portion 6, and the protruding tip of the pressing member 31 is abutted against the friction cam surface 27.

FIGS. 1 and 2 show an embodiment of the invention described in claims 1, 2, 4 and 5, wherein the friction cam surface 27 is circular concentric with the rotating shaft 9 and the pressing member 31 is projected. With respect to the normal line N of the cam 25 passing through the abutting point on the friction cam surface 27 at the tip, the axis line S obliquely extending in the intake throttle valve closing rotation direction of the rotary shaft 9, that is, the counterclockwise rotation direction in the drawing.
The resistor unit 29 is arranged above.

When the accelerator pedal 20 is depressed, the accelerator lever 14 and the rotary shaft 9 integrated with the accelerator lever 14 rotate clockwise in the drawing. At this time, the compression spring 34 is attached to the friction cam surface 27.
Member 3 that is abutted by the spring load of
1 gives the cam 25 frictional resistance toward the rear of rotation. The friction cam surface 27 opposes the spring load of the compression spring 34 at the abutting point and rotates in a direction in which the compression spring 34 tries to compress the spring load.
Increase the pedaling force of 0.

By appropriately selecting the material of the friction member 26, the material and tip shape of the pressing member 31, the mounting angle of the resistor unit 29, and the spring load of the compression spring 34, a conventional long wire cable can be used. It is possible to operate the accelerator with the same level of pedaling force as it used to, without any discomfort.

When the accelerator pedal 20 is loosened, the rotating shaft 9
Is rotated counterclockwise in the figure by the spring load of the return spring 17. At this time, since the friction cam surface 27 rotates obliquely in the direction of the spring load of the compression spring 34 at the abutting point, the friction resistance is significantly smaller than the above, and the intake throttle valve closing response at the time of accelerator return is good. The engine can be decelerated as scheduled.

FIGS. 4 and 5 show an embodiment of the invention described in claims 1, 3, 4 and 5, wherein the cam 25 is directed toward the intake throttle valve opening rotation direction of the rotary shaft 9, that is, the clockwise direction in the drawing. A curved surface 28 having a large diameter is provided over the range of an arc corresponding to the entire rotation angle of the rotary shaft 9, and the resistor unit 29 is arranged on the normal line N of the rotary shaft 9 to close the intake throttle valve. At the position, the protruding tip of the pressing member 31 is abutted against the friction cam surface 27 at the maximum diameter portion of the curved surface 28.

Therefore, at the intake throttle valve closed position, the compression spring 27 is most compressed and the pressing member 31 is abutted against the friction cam surface 27 with a strong force, and the accelerator pedal 20 is depressed to depress the accelerator lever 14 and this. When the rotary shaft 9 integrated with the rotary shaft 9 starts to rotate clockwise in the drawing, the pressing member 3
The reference numeral 1 gives a frictional resistance to the rear of the rotation to the cam 25, which increases the pedaling force of the accelerator pedal 20 and starts the accelerator operation with the same pedaling force as that using a conventional long wire cable. is there.

This stepping force increase is set by appropriately selecting the material of the friction member 26, the material and tip shape of the pressing member 31, and the spring load of the compression spring 34, and the amount of depression of the accelerator pedal 20 is increased. Accordingly, the cam surface 28 at the abutting portion of the pressing member 31 has a small diameter, so that the stepping force is gradually reduced. Therefore, in addition to preventing unexpected acceleration due to excessive depression, which requires maximum pedaling force at the start of accelerator operation, frictional resistance gradually decreases thereafter, allowing accelerator operation in the high engine speed range to be performed lightly. You can

When the accelerator pedal 20 is loosened, the rotary shaft 9
Is rotated counterclockwise in the figure by the spring load of the return spring 17. At this time, since the abutting point of the friction cam surface 27 shifts from the small diameter portion of the cam 25 to the large diameter portion, the friction resistance is small at the beginning and the closing response of the intake throttle valve is good, but close to full closing. With this, the dashpot function of increasing the frictional resistance and decreasing the valve closing speed is exhibited, and smooth engine deceleration can be performed.

As described above, according to the above-mentioned two embodiments, a large force is required when the accelerator pedal 20 is depressed, but when it is released, the accelerator pedal 20 rotates with a smaller force than this, and the accelerator operation is performed with a comfortable pedaling force and a small force. It is possible to provide a hysteresis by rotation direction such that it is smoothly returned by, and the magnitude of the force and the hysteresis difference, that is, the torque difference is set to an optimum value depending on the abutting angle of the pressing member 32, the shape of the cam 25, and the like. It is possible to adjust with the adjusting screw 33 even after assembling.

A block made of synthetic rubber or elastomer may be used as a means for elastically abutting the pressing member 31 against the friction cam surface 27, but a compression spring 34 is used as in the illustrated embodiment. It is preferable to adjust with the adjusting screw 33, and by using these as the resistor unit 29 incorporated in the guide cylinder 30, the installation at a predetermined position becomes easy. Further, even when the intake throttle valve is arranged close to the accelerator pedal due to the layout in the engine room, the accelerator operation resistance generating means of the present invention is applied to the valve shaft of the intake throttle valve to shorten the wire cable. It is possible to eliminate the depressing force.

Furthermore, the diesel engine can be designed such that the electrical signal of the accelerator sensor 7 actuates an actuator that rotates the plunger of the injection pump.

[0033]

As described above, a cam having a friction cam surface is attached to a rotary shaft that is connected to an accelerator pedal by a wire cable and drives an output control device indirectly or directly, and a pressing member is elastically attached to the friction cam surface. According to the present invention in which the frictional resistance is generated when the wire cable is rotatively abutted, the pedaling force that is reduced when the wire cable is shortened is increased to the same level as the conventional one as compared with the conventional one. Therefore, it is possible to operate the accelerator with the same feeling as a conventional one without the inconvenience of depressing more than necessary and causing an unexpected acceleration to cause an accident, or conversely hesitating to impair the drivability. Is something that can be done.

Further, when the abutting direction of the pressing member and the shape of the cam are the same as those of the present invention, the frictional resistance at the time of returning the accelerator is reduced and the response of returning is improved, especially the friction at the start of the accelerator operation. It is possible to provide a characteristic that the resistance is increased to surely prevent over-depressing and to have a dashpot function when the output is reduced, so that stable and excellent driving performance can be given. .

[Brief description of drawings]

FIG. 1 is a partially cut side view showing a first embodiment of the present invention.

FIG. 2 is an enlarged partial view of FIG. 1;

FIG. 3 is a partially cutaway front view of the embodiment of FIG.

FIG. 4 is a partially cut side view showing a second embodiment of the present invention.

FIG. 5 is an enlarged partial view of FIG. 4;

[Explanation of symbols]

7 accelerator sensor, 9 rotary shaft, 14 accelerator lever, 19 accelerator wire, 20 accelerator pedal, 2
5 cam, 27 friction cam surface, 28 curved surface, 29 resistor unit, 30 guide tube, 31 pressing member, 32
Adjusting screw, 34 compression spring,

Claims (5)

[Claims] 1. A drive mechanism for an output control device, wherein a rotary shaft for indirectly or directly driving an output control device of an engine and an accelerator pedal are connected by a wire cable, and the rotary shaft rotates in accordance with an accelerator operation amount. An accelerator operation resistance generating device, wherein a cam having an outer peripheral surface formed as a friction cam surface is attached to the rotary shaft, and a pressing member is elastically abutted against the friction cam surface. 2. The friction cam surface is formed into a circular shape concentric with the rotary shaft, and the pressing member is oblique with respect to the normal line of the cam passing through the abutting point, in the output reduction rotation direction of the rotary shaft. The accelerator operation resistance generation device according to claim 1, wherein the accelerator operation resistance generation device is arranged in the. 3. The friction cam surface is a curved surface having a large diameter in the output increasing rotation direction of the rotating shaft, and the pressing member is arranged on a normal line of the rotating shaft.
2. The accelerator operation resistance generator according to 1. 4. The pressing member is fitted in a guide cylinder so as to be movable back and forth with its tip portion protruding, and a compression spring for pressing the pressing member is fitted in the guide cylinder, and the compression spring is also provided. 5. A resistor unit, to which an adjusting screw for adjusting the spring load is screwed, is installed with the abutting member abutting against the friction cam surface.
An accelerator operation resistance generating device described in any one of 1. 5. The rotary shaft of an accelerator sensor for sending an electric signal according to an operation amount of the accelerator pedal to an actuator for driving the output control device, according to any one of claims 1, 2 and 3. The described accelerator operating resistance generator.