JPS6045729A - Acceleration sensor - Google Patents

Abstract

PURPOSE:To enable fine accelerating operation, by providing a detector which detects an operating force which acts to accelerating operation member after the displacement of the member found out by a displacement detector has reached a limit, to provide more diverse accelerating functions. CONSTITUTION:When a depressing force has further acted to an accelerator pedal 10 after its depression to a limit position, a stopper pin 16 comes into contact with a stopper arm 15a to suppress the rotation of a shaft 12. At that time, torque acts, because of the depressing force, to the end of the shaft 12 which is fitted with a pedal arm 11, so that tensile and compressive stresses act to the shaft 12 in a direction of 45 deg. in angle to the axial direction. Since the shaft 12 undergoes a positive magnetostriction like such a magnetic substance as iron and permalloy, the magnetic permeability is increased by the inverse magnetostrictive effect in the direction of the action of the tensile stress along with the increase of the torque so that the reluctance is reduced along with the increase of the tensile stress, the electromotive force induced in a detection coil 23 is augmented, and an output voltage E is heightened. For that reason, a quantity of acceleration corresponding to the depressing force on the pedal 10 is attained.

Description

Detailed Description of the Invention (Industrial Application Field) This invention detects the displacement and operating force caused by the operation of an accelerator operator, converts it into an electric signal, and converts this into an electric signal that can be used as a single engine output control command from the driver. This invention relates to an improvement in an accelerator sensor that is supplied to an electronically controlled engine output control section.

(Background of the invention) Conventionally, the connection between the accelerator pedal and the throttle valve in the carburetor was
Because it relies on a mechanical link mechanism, maintenance is relatively complicated and costs increase, so the position of the accelerator pedal is detected by an accelerator sensor that generates an electrical signal corresponding to the amount of accelerator pedal depression. A system has been proposed that attempts to adjust the throttle valve opening of the carburetor in accordance with this detection signal. As such a system, for example, Japanese Patent Application Laid-open No. 18702/1982,
JP-A-57-84098, JP-A-57-19582
There are those shown in Publication No. 3 and Japanese Unexamined Patent Publication No. 198803/1983.

The conventional accelerator sensor has a structure as shown in FIG. 1, for example. In the figure, an accelerator pedal 1 is rotatably mounted around a fulcrum shaft 2 at its center, and the pedal stroke is limited by an initial position @ setting stopper 4 and a full load position @ setting stopper 5. There is.

The tip of the accelerator pedal 1 is connected to the shaft of a potentiometer 7 by a rod 6.

Therefore, as shown in FIG. 2, the accelerator pedal 1
If the rotation angle θ is the depression angle, the output voltage V of the potentiometer 7 will be proportional to the depression angle θ. Then, when the accelerator pedal 1 contacts the full load position setting stopper, the depression angle θ of the accelerator pedal reaches the maximum θmax, and at this time, the output voltage of the potentiometer reaches the maximum ymax, and the throttle valve of the carburetor It is set to be fully open.

However, in the conventional accelerator sensor mentioned above,
Since the output only corresponds to the displacement of the accelerator pedal, such as the depression angle of the accelerator pedal,
The driver can only operate the accelerator pedal within a limited range of displacement, and cannot perform more delicate operations. In particular, with the recent development of microcomputers and the electronic control of various parts of vehicles, there is a demand for improved accelerator operability.

(Object of the Invention) This invention was made in view of the above circumstances, and its purpose is to provide an accelerator sensor that further diversifies accelerator operation functions and enables more delicate accelerator operations. It is in.

(Structure of the Invention) In order to achieve the above object, the present invention includes a displacement detector that detects the displacement of an accelerator operator due to accelerator operation, and a displacement detector that detects the displacement of an accelerator operator due to accelerator operation; The device is characterized in that it includes an operating force detector that detects an operating force applied to the operator.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to FIG. 3 and subsequent drawings.

FIG. 3 is a front view showing the configuration of an embodiment of an accelerator sensor according to the present invention. In the same figure, accelerator pedal 1
0 is attached to one end of a petal arm 11, and the end of this petal arm 11 is fastened by a bolt 14 to one end of a shirt 12 made of a magnetic material such as iron or permalloy. The magnetic shaft 12 is rotatably supported by a bearing 15 fixed to the vehicle body, and a magnetic sensor 17 is provided on the inner surface of the bearing 15 facing the shaft 12.

Further, a stopper pin 16 is provided at the other end of the shaft and protrudes in the radial direction of the shaft.
A stopper arm 15a that protrudes in the axial direction of the shaft 12 is provided on one side of the bearing 15.
After the stopper arm 15a comes into contact with the stopper bin 16 due to the rotation of the shaft 12, the shaft 12 is configured not to rotate any further.

Note that the return spring 13 is connected to the accelerator pedal 10.
washer 18. for urging it toward the initial position.
Reference numeral 19 is for preventing the shift 12 from shifting.

As shown in FIGS. 4 and 6, the magnetic sensor 17 has an excitation coil 22 attached to one end of a core 21 formed in a substantially U-shape made of a magnetic material such as Ferray 1 or permalloy.
A detection coil 23 is arranged at the other end,
Both end surfaces of the core 21 are arranged close to and opposite to the circumferential surface of the shaft 12, and the angle θ1 formed between the straight line connecting both coils 22 and 23 and the axial direction of the shear shaft 12 is approximately 45°.
It is arranged so that.

The excitation coil 22 is connected to an excitation circuit 2 as shown in FIG.
4 generates a magnetic field and applies it to the shaft 12, and the detection coil 23 generates an induced electromotive force in response to changes in the magnetic field. This induced electromotive force is amplified by an amplifier 25. Furthermore, the detection signal amplified by this amplifier is output after being rectified by a rectifier 26.

Note that both end surfaces of the core 21 are formed into curved surfaces having a curvature corresponding to the maximum curvature of the outer circumference of the shaft 12.

As shown in FIG. 5, a portion of the outer periphery of the shaft 12 facing the magnetic sensor 17 has a substantially sickle-shaped cross-sectional shape in a predetermined angular range θ0 to θmax.
A notch 12a is formed which becomes a part of the spiral line.

When the accelerator pedal 10 is at the initial position, the deepest portion θ of the notch 12a is not shown in FIG. is located directly below the front surface P of the magnetic sensor 17, and the magnetic gap formed between the core 21 and the outer periphery of the shaft 12 is maximum. In response, when the accelerator pedal 10 is depressed, the shaft 1
2 rotates, and the stopper bin 16 moves to the stopper arm 15a.
At the time of contact (depression limit position), O max in FIG. 5 becomes directly below the front surface P of the magnetic sensor 17, and the magnetic gap becomes minimum.

Therefore, as shown in FIG. 7, the displacement from the initial position of the accelerator pedal, that is, the state where the displacement is O, to the depressing limit position where the stopper pin 16 contacts the stopper arm 15a is defined as θmax, and θmax is θmax as shown in FIG. θ at
. In the range from θ to θmax), the magnetic gap changes in response to the displacement of the accelerator pedal, and the output voltage E changes in proportion to the displacement. That is, the shaft 12 rotates when the accelerator pedal 10 is depressed, and the magnetic resistance of the magnetic circuit composed of the magnetic sensor 17 and the shaft 12 changes as the shaft 12 rotates, causing the detection coil 23 to rotate. This is because the induced electromotive force fluctuates.

Next, after the accelerator pedal 10 has been depressed to the above-mentioned depression limit position, when further depression force is applied to the accelerator pedal 10, one end of the shaft 12 is moved to the stopper pin 1.
G is in contact with the stopper arm 15a, so the rotation of the shaft 12 is suppressed. A rotational moment is applied by the horns, and a torsion horn (torque) acts on the shaft 12.

When torque is applied to the shaft 12, tensile and compressive stresses are applied to the surface of the shaft in a direction of 45 degrees with respect to the axial direction. Magnetic materials such as iron and permalloy have positive magnetostriction, so as the 1 to 1 torque acting on the shaft 12 increases, the magnetic permeability increases due to the reverse magnetostrictive effect in the direction a3 where tensile stress acts, and the magnetic The resistance decreases as the tensile stress increases, and the induced electromotive force generated from the detection coil 23 increases.

Therefore, as shown in FIG. 8, torque acts on the shaft 12 in response to the depression force applied to the accelerator pedal 10, and the output voltage E increases as the torque increases.

With the above configuration □, the displacement of the accelerator pedal is On+
The accelerator suspension corresponds to the amount of depression of the accelerator pedal until reaching ax, and after the accelerator pedal depression reaches the maximum (when the displacement reaches θmax), the accelerator suspension corresponds to the depression force of the accelerator pedal. This will be obtained.

Therefore, when the output voltage E max that fully opens the throttle valve is obtained, the torque applied to the shaft 12 is T m
ax, and when the displacement of the accelerator pedal reaches the maximum θmax, the output voltage is E, which is slightly lower than Emax.
By setting the value to 1, the driver normally operates the accelerator according to the amount of depression of the accelerator pedal, and when climbing up a hill or overtaking the vehicle, the driver depresses the accelerator pedal to the limit position and further adjusts the pedal force. This allows the necessary engine output to be obtained.

Next, FIG. 9 is a diagram showing the structure of another embodiment of the present invention. In the same figure, the accelerator pedal arm 31 is formed into a gentle "R" shape and has an accelerator pedal 30 at one end, and a substantially U-shaped locking part 31a at the other end. It is formed. The center portion of the accelerator pedal arm 31 is rotatably attached to the support plate 33 by a support shaft 34.

A magnetic sensor 35 is provided at the upper end of the support plate 33, facing the locking portion 31a.
A locking pin 37 is formed perpendicularly to the axial direction at the end of a magnetic material iron 36 constituting the accelerator pedal arm 5, and is configured to engage with a locking portion 31a at the tip of the accelerator pedal arm 31.

The return spring 32 serves to bias the accelerator pedal 31 to the initial position.

The configuration of the magnetic sensor 35 is as shown in FIG. 10(a), in which a magnetic rod 36 made of a magnetic material such as iron or permalloy is slidably inserted into a cylindrical case 46 made of a non-magnetic material. It has a built-in structure. Further, the electrical configuration is the same as that of the embodiment shown in FIG. 6.

The diameter of the magnetic rod 36 on the side where the locking pin 37 is formed is smaller than the diameter on the other end side, and the intermediate portion between the small diameter part 38 and the large diameter part 40 is formed into a gentle taper shape. . Furthermore, a stopper portion 41 having an even larger diameter is provided at the end of the larger diameter portion 40 .

Inside the cylindrical case 46, there is housed a ring-shaped core 42 having a cross-section shape, and a concentric ring-shaped excitation coil 43 and a concentric ring-shaped excitation coil 43 and A detection coil 44 is fitted.

Further, the magnetic iron 36 is slidably supported by a bearing 45 such that its central axis passes through the center of the diameter of the detection coil 44 . The spring 47 is for urging the magnetic rod 3G to the right in the figure.

When the accelerator pedal 30 is at the initial position, the tapered portion 39 of the magnetic rod 36 has its smallest diameter portion aligned with the inner circumferential surface of the detection coil 44, as shown in FIG. 10(a). As shown in Figure (b), when the magnetic material iron 36 slides to the left in the figure by depressing the accelerator pedal 30, the larger diameter part of the tapered part 39 gradually increases. It comes to face the inner circumferential surface of the detection coil 44. Therefore, accelerator pedal 3
The detection coil 44 and the tapered portion 39 correspond to the amount of depression of 0.
The magnetic V-tube between the outer circumferential surface changes and the output voltage from the detection coil changes accordingly.

Then, at the depression limit position where the displacement of the accelerator pedal 30 is maximum, as shown in FIG. 10(C),
The tapered portion 39 escapes from the cylindrical coos 46 and becomes the large diameter portion 40.
If the outer circumferential surface of the detection coil 4.4 is set to face the inner circumferential surface of the detection coil 4.4, the output voltage E will change in response to the displacement of the accelerator pedal, as shown in FIG. 7, as in the previous embodiment. I will do it. Note that the displacement of the accelerator pedal is θma
When x, the sliding distance of the magnetic iron 36 is! This is equal to the length of three tapered parts.

Further, when the displacement of the accelerator pedal reaches the maximum, that is, when the taper part 39 comes out from the cylindrical case 46 by ns2 as shown in FIG. More than that is magnetic Rondo 3
If the accelerator pedal 30 is further depressed from this state, tensile stress will be applied to the magnetic iron 3G.

Therefore, since the diameter of the large diameter portion 40 is uniform,
Positive magnetic strain is generated within the magnetic rod in response to the tensile stress acting on the magnetic rod 36, and thereby the induced electromotive force generated in the detection coil 44 changes.

The change in the output voltage E at this time is equal to that in which the horizontal axis is the tensile stress in FIG. The voltage E will also follow this. Therefore, in the accelerator sensor of this embodiment as well, it is possible to secure a range in which the accelerator operation is performed by the depressing force of the accelerator pedal and a range in which the accelerator operation is performed by the depressing force of the accelerator pedal, making it possible to perform more diverse accelerator operations.

In each of the above embodiments, a magnetic sensor is used to detect the displacement of the accelerator pedal and the depression force of the accelerator pedal, but the present invention is not limited to this, and other sensors may be used. You may also use Also,
The displacement detector and the stepping force detector may be separate bodies.

(Effects of the Invention) As described in detail above, in the accelerator sensor of the present invention, the accelerator operation functions can be more diversified and more delicate operations can be performed.

[Brief Description of the Drawings] Fig. 1 is a side view showing the configuration of a conventional accelerator sensor, Fig. 2 is a characteristic diagram showing its output characteristics, and Fig. 3 is the configuration of an embodiment of the accelerator sensor according to the present invention. Front view showing 4th
The figure is a plan view showing the arrangement of the shaft and magnetic sensor, Figure 5 is a sectional view of the shaft, Figure 6 is a block diagram showing the electrical configuration of the magnetic sensor, and Figures 7 and 8 are the output of the accelerator sensor. FIG. 9 is a perspective view showing the structure of another embodiment of the present invention, and FIG. 10 is a sectional view showing the structure of the magnetic sensor of the same embodiment. 10.30... Accelerator pedal 12... Shaft 12a...
...Notch 15a...Stopper arm 1G...
......Stopper bin 17.35...Magnetic sensor 36...Magnetic material rond 39...
・・・・・・・・・Deep part 40・・・・・・・・・・
...Large diameter part/11... Stopper part Fig. 1 Fig. 2 Fig. 3 Fig. 7 Fig. 8 111, 47I) Lua Fig. 9 Fig. 5

Claims (1)

[Claims] (1) a displacement detector that is provided on an accelerator operator that can be displaced up to a predetermined limit position by an external accelerator operation, and detects the displacement of the accelerator operator due to the accelerator operation; An accelerator sensor comprising: an operating force detector that detects an operating force applied to an accelerator operator after the accelerator reaches a position.