JPH11257487A - Shift position detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device to detect many shift positions in a limited arrangement space. SOLUTION: This detecting device comprises a body 20 to be detected to interlock with the change of a shift position; a plurality of protrusion parts arranged at the body 20 to be detected; a hole IC to detect the protrusion part and a magnet on the back of the hole IC arranged on the concentric circle of the protrusion part; and a terminal 16 to output a detecting result obtained by the hole IC. A shift position is detected through a magnetic field, generated at the hole IC, by the position of the protrusion part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a shift position of an automobile transmission.

[0002]

2. Description of the Related Art Conventionally, in the detection of a shift position in a transmission for an automobile, a method for detecting a minimum necessary position such as reverse, neutral, or drive has been used. In this detection, a contact type switch is widely used. Widespread.

In such a shift position detecting device, three contact switches such as reverse, neutral, and drive are arranged near the shift knob, and the contact switches are turned on and off according to the position of the shift knob to detect the shift position. I have.

[0004]

However, in the conventional shift position detecting device as described above, there are problems in terms of a hardware mounting layout and a decrease in reliability due to dust and the like. That is, it is necessary to provide a plurality of contact switches in a limited space near the shift knob at the mounting position, and such switches are obstacles to the layout and design. In addition, in addition to dust and dirt, oil and water droplets easily enter the vicinity of the mounting position,
If such a substance adheres to the contact portion, there arises a problem that the contact portion malfunctions or deteriorates and reliability is impaired.

[0005] In view of the above problems, an object of the present invention is to provide an apparatus for detecting many shift positions in a small arrangement space.

[0006]

In order to solve the above-mentioned problems, according to the present invention, there is provided an object to be detected which is interlocked with a change in a shift position, and the object to be detected is provided with a plurality of projections. Hall IC for detecting the protrusion on the concentric circle of the protrusion
And a terminal having a magnet on the back surface of the Hall IC and outputting a detection result by the Hall IC, wherein the shift position is detected by a magnetic field generated in the Hall IC according to the position of the protrusion. A position detection device. Further, the Hall IC and the magnet may be configured by an opto device, and a shift position detecting device that detects a shift position by a change in light may be used.

[0007]

According to the above configuration, when the Hall IC 12 is provided, the magnetic field from the magnet 14 provided on the back surface is
The magnetic field between the magnet 14 and the detection target 20 changes in response to the protrusion 22 of the detection target 20 accompanying the change in the shift position. Hall I which quantizes the change by a certain judgment value
C12 makes a determination, thereby recognizing where the shift position has been changed.

In the case where the Hall IC is not used and an opto device is used, the magnet 14 is unnecessary. The opto-device includes a light-emitting unit and a light-receiving unit as well as a well-known photo-interrupter, and detects a shift position according to a state of reflection from the detection target 20.

The detection object such as the Hall IC or the opto device produces binary data corresponding to each shift position and outputs the binary data to the outside.

[0010]

1 is a block diagram of a shift position detecting device according to an embodiment of the present invention. In FIG. 1, a shift position detecting device includes a rotating body having two projections 22a and 22b as a detection target 20, and a detection unit that detects the positions of the projections 22a and 22b.
Consists of 10 and 10. At least the protruding portion 22 of the detection target 20 is made of metal, and the shift position changes, that is, shifting from neutral to reverse,
When shifting to the drive, the detection target 20 rotates in the direction of the arrow according to this operation.

The detecting unit 10 has three Hall ICs 12a and 1
2b, 12c, magnets 14a, 14b, 14c provided on the back of each of these Hall ICs 12,
It comprises a substrate 18 for processing the signal of C12 and a terminal 16 for outputting a signal from the substrate 18. More specifically, the three Hall ICs 12 and the magnet 14 in the detection unit 10 are arranged on the concentric circumference of the projections 22a and 22b of the detection target 20. As is well known, the Hall IC 12 uses the magnet 14 provided on the back surface as a magnetic bias source to detect the position and rotation angle of the detection target 20 by a magnetic field that changes according to the position of the metal protrusion 22.

In the above description, the Hall IC 12 and the magnet 14 are used as the detectors of the projections 22, but for example, other optical semiconductor components called a photo-interrupter or an opto-device may be used. In this case, the material of the detection target 20 including the protrusion 22 may be made of any material, such as metal or magnetic material.

The detection object such as the Hall IC or the opto device produces binary data corresponding to each shift position and outputs it to the outside. An example of this output form is as shown in FIG.

In the above construction, in this embodiment, the Hall element is used to detect the shift position in seven stages.
Although 12 is set to 3, this number is set to 2 according to the request, for example, if the detection is performed in 4 steps, and 3 if it is within 8 steps.
The number can be appropriately changed to four, if the number is within 16 steps.

[0015]

According to the above configuration, the shift position can be detected by the non-contact components, so that the reliability of the detection result is improved, the whole apparatus can be downsized, and the layout can be improved. Further, even when the number to be detected increases, the size of the device itself does not change and can be arranged within a fixed size.

[Brief description of the drawings]

FIG. 1 shows a configuration diagram of a shift position detection device of the present invention.

FIG. 2 shows an example of a pattern of a shift position and a detection object output result.

[Explanation of symbols]

 In the drawings, the same reference numerals indicate the same or corresponding parts. 10 Detector 12 Hall IC 14 Magnet 16 Terminal 18 Board 20 Detected object 22 Projection

Claims (3)

[Claims] A hall IC for detecting a projection on a concentric circle of the projection, the detection IC having a detected object interlocked with a change in a shift position; A magnet is provided on the back of the Hall IC,
A shift position detecting device comprising: a terminal for outputting a detection result by C; and detecting a shift position by a magnetic field generated in the Hall IC based on the position of the protrusion. 2. An apparatus according to claim 1, further comprising: an object to be detected which is interlocked with a change in a shift position, said object to be detected having a plurality of projections, and an opto-device for detecting said projection on a concentric circle of said projections. And a terminal for outputting a detection result by the opto-device, wherein the shift position is detected by a change in light input to the opto-device according to the position of the projection. 3. The shift position detecting device according to claim 1, wherein the shift position detecting device comprises three Hall ICs and three magnets or opto devices and can detect a maximum of eight shift positions.