JP2010120394A - Shift position detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shift position detection device for a shift-by-wire transmission system allowing achievement of a fail-safe function without an increase of the number of sensors to be used. <P>SOLUTION: In this shift position detection device, the sensors 5 to 9 are arranged by being made to correspond to each position of a shift lever, and the shift position is detected by the sensors 5 to 9. The shift position detection device is constituted of a rotating body 12 rotating by interlocking with a shift operation of the shift lever, two kinds of signal generation means 3 and 4 arranged at different angle positions on the rotating body 12, the sensors 5 to 9 arranged oppositely to the rotating body 12 to output three values of H-M-L according to proximity/isolation of the two kinds of signal generation means 3 and 4, and a position detection circuit for deciding the shift position by the combinations of the three values of H-M-L outputted from each sensor 5 to 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shift position detection device.

  2. Description of the Related Art A shift-by-wire transmission system is known in which movement of a shift lever is detected by a position sensor, and a shift operation is performed by an actuator controlled by a computer based on a signal from the position sensor.

  In this speed change system, a position sensor that replaces the operation position of the shift lever with an electric signal is essential, and conventionally, there are those composed of a permanent magnet that generates a magnetic field and a plurality of Hall elements arranged so as to be covered with the magnetic field. Known (Patent Document 1).

In such a conventional technique, the output signal of the Hall element is detected as either an ON or OFF signal, and position detection is performed by a combination of two or three Hall elements that are ON. When position detection is performed using a Hall element, it is necessary to configure a redundant circuit so that position detection is not hindered even if one Hall element fails. Therefore, for example, as shown in FIG. 1, seven Hall elements are required to detect five positions and to have a fail-safe function. However, since an increase in the number of sensors used leads to an increase in installation space, there has been a demand for a technology that realizes a fail-safe function with a smaller number of sensors.
JP-T-2004-516996

  An object of the present invention is to provide a shift position detecting device for a shift-by-wire transmission system that can realize a fail-safe function without increasing the number of sensors used.

  The shift position detection device of the present invention made to solve the above problems is a shift position detection device in which a sensor is arranged corresponding to each position of the shift lever and the shift position is detected by these sensors. A rotating body that rotates in conjunction with a lever shift operation, two types of signal generating means arranged at different angular positions on the rotating body, and two types of signal generation arranged opposite to the rotating body. A sensor that outputs three values of H, M, and L according to the proximity and separation of the means, and a position detection circuit that determines a shift position by a combination of the three values of H, M, and L output from each sensor; It is characterized by.

  According to a second aspect of the present invention, in the shift position detecting device according to the first aspect, the two types of signal generating means are the north and south poles of the magnet, and the sensor is an analog Hall element. is there.

  According to a third aspect of the present invention, in the shift position detecting device according to the first aspect, the two types of signal generating means are arranged close to the two sensors simultaneously at each shift position. It is arrange | positioned in the position to perform.

  According to a fourth aspect of the present invention, there is provided the shift position detecting device according to the first aspect, further comprising a select confirmation switch for detecting a select operation of the shift lever, wherein the position detection circuit includes an output from the select confirmation switch and an output from each sensor. From the above, it has a function of judging the shift position in the manual mode.

  According to a fifth aspect of the present invention, in the shift position detecting device according to the first aspect, when an abnormality occurs in one of the sensors, the position detection circuit determines the shift position based on the outputs of the remaining sensors. It has a function of detecting and enabling provisional operation.

  According to a sixth aspect of the present invention, in the shift position detecting device according to the fifth aspect, the position detection circuit is provided with a function that disables operation when abnormality occurs in two or more of the sensors. It is characterized by being.

  A shift position detecting device according to the present invention is a rotating body that rotates in conjunction with a shift operation of a shift lever, two types of signal generating means arranged at different angular positions on the rotating body, and the rotating body. A sensor that outputs three values of H, M, and L according to the proximity and separation of these two types of signal generating means, and a combination of the three values of H, M, and L output from each sensor By providing a position detection circuit for determining the shift position, the fail-safe function can be realized without increasing the number of sensors used.

  According to the invention described in claim 2, by adopting the magnet as the signal generating means, an electric terminal for operating the signal generating means becomes unnecessary, and the durability is improved.

  According to the invention described in claim 3, the shift position detecting device can be miniaturized by arranging the sensors concentrically.

  According to the fifth and sixth aspects of the invention, when an abnormality occurs in the sensor, the position detection circuit determines that provisional operation is possible or impossible based on the abnormality level, thereby realizing a safe fail-safe function. The

  FIG. 2 shows a schematic configuration diagram of the shift position detection device of the present invention. FIG. 3 is a side view seen from the direction A of FIG. The gear 1 shown in FIGS. 2 and 3 is connected to a shift lever (not shown). The movement of the shift lever is transmitted through the gears 1 and 2 as the movement in the rotational direction of the rotating body 12 on which the permanent magnets 3 and 4 are arranged. The shift lever is supported so as to be tiltable back and forth and left and right according to a pattern similar to that of a conventionally known transmission control lever. For example, as shown in FIG. 4, the shift position includes a parking position (P), a reverse position (R), a neutral position (N) and a shift-up position (+), a drive position (D), and a shift-down position (-). It consists of each position.

  As shown in FIG. 2, the shift position detecting device of the present invention includes a rotating body 12 in which a permanent magnet 3 that forms an S-pole magnetic field and a permanent magnet 4 that forms an N-pole magnetic field are arranged. A sensor substrate 10 provided with a plurality of sensors 5 to 9 made of analog Hall elements is disposed at a position connected to a shift lever (not shown) via 12 and facing the magnetic pole surface of the permanent magnet. In this embodiment, for example, when the shift lever is moved to the P position, the sensor that faces the S pole magnetic field is a P sensor, the sensor 5 is an N sensor, the sensor 6 is an R sensor, the sensor 7 is a P sensor, The sensor 8 is referred to as a -sensor, and the sensor 9 is referred to as a D sensor.

  The permanent magnets 3 and 4 are arranged with a fixed angle so as to form magnetic fields of the S pole and the N pole, respectively, and maintain an angle at which these both magnetic fields do not affect each other.

  Sensors 5 to 9 are analog Hall elements, and are elements that detect voltage induced by a magnetic field formed by a permanent magnet as analog data. Specifically, as shown in FIG. 5, the voltage output level when induced by a magnetic field formed near the N pole is the H level, and the voltage output level when induced by a magnetic field formed near the S pole. Is output at the L level, and the voltage output level when not affected by any of the magnetic fields is classified into three types of M level.

  FIG. 6 shows a position detection matrix when each position (P, R, N, D, +, −) is normally detected. FIG. 7 shows the position of the permanent magnet when the shift lever is operated to the P position, and FIG. 8 shows the position of the permanent magnet when the shift lever is operated to the + position. Note that the signal of the select confirmation switch (M) shown in FIGS. 6 and 7 is switched by moving the shift lever between DM in the shift position arrangement shown in FIG. 4, for example.

  As shown in FIG. 7, when the shift lever is in the P position, the P sensor 7 detects the magnetic field formed by the S pole 4 of the permanent magnet, and the N sensor 5 detects the magnetic field 3 formed by the N pole. The remaining −sensor 8, R sensor 6, and D sensor 9 are not affected by any of the magnetic fields formed by the S pole 4 and the N pole 3. Therefore, when the shift lever is in the P position, the P sensor 7 outputs an L level signal, the N sensor 5 outputs an H level signal, and the -sensor 8, the R sensor 6 and the D sensor 9 each output an M level signal. The select confirmation switch 11 outputs an H level signal.

  Next, when the shift lever is moved from the P position to the D position, and the shift lever is moved to the M position on the right side of the D position in FIG. Switch. Thereafter, when a shift-up operation is performed by moving the shift lever in the + direction, the N sensor 5 detects the magnetic field formed by the south pole 4 of the permanent magnet and the north pole 3 is formed as shown in FIG. The sensor 8 detects the magnetic field. The remaining P sensor 7, R sensor 6, and D sensor 9 are not affected by any of the magnetic fields formed by the S pole 4 and the N pole 3. Therefore, when the shift lever is in the + position (shared with the N position), the N sensor 5 is an L level signal, the-sensor 8 is an H level signal, and the P sensor 7, the R sensor 6 and the D sensor 9 are each an M level. The signal is output. The select confirmation switch 11 outputs an L level signal.

  Thus, in the shift position detection device of the present invention, all the sensors (P sensor 7, R sensor 6, N sensor 5, D sensor 9, -sensor 8) are analog data detection sensors, and all these sensors are By detecting the detected analog data as signals of L, H, and M levels and detecting the shift position based on these output signals, the fail-safe function can be maintained with a small number of sensors. For example, as shown in FIG. 1, when the ON / OFF digital signal ON output is detected to determine the position position, if the fail-safe function is incorporated in the 5-position detection, seven sensors are required. On the other hand, according to the present invention, the same five-position detection can be realized with five sensors as a fail-safe function.

  FIG. 9 shows a system block diagram of a position detection circuit for realizing the fail-safe function of the present invention. The position detection circuit has a function of enabling a temporary operation by detecting a shift position based on the outputs of the remaining sensors when an abnormality occurs in one of the sensors. In addition, it has a function of making it impossible to operate when abnormality occurs in two or more of the sensors. In this way, a fail-safe function with improved safety is realized.

It is a conventional shift position detection matrix. It is a schematic block diagram of this invention apparatus. It is A side view of FIG. It is explanatory drawing which shows an example of a shift pattern. It is explanatory drawing of the voltage output level induced by the magnetic field which S pole and N pole form. It is a shift position detection matrix of the present invention. It is position detection explanatory drawing in case a shift lever exists in a P position. It is position detection explanatory drawing in case a shift lever exists in + position. It is a system block diagram of a position detection circuit of the present invention.

Explanation of symbols

1, 2 Gear 3, 4 Permanent magnet 5-9 Sensor 10 Sensor substrate 11 Select confirmation switch 12 Rotating body

Claims (6)

A shift position detection device that arranges a sensor corresponding to each position of the shift lever and detects the shift position by these sensors,
A rotating body that rotates in conjunction with a shift operation of the shift lever;
Two types of signal generating means arranged at different angular positions on the rotating body;
A sensor that is arranged to face the rotating body and outputs three values of H, M, and L according to the proximity and separation of these two types of signal generating means;
A position detection circuit that determines a shift position by a combination of three values of H, M, and L output from each sensor;
A shift position detecting device comprising:   2. The shift position detecting apparatus according to claim 1, wherein the two types of signal generating means are a north pole and a south pole of a magnet, and the sensor is an analog Hall element.   2. The shift position according to claim 1, wherein the sensors are concentrically arranged on a fixed sensor substrate, and the two types of signal generating means are arranged at positions simultaneously close to the two sensors at each shift position. Detection device.   It is equipped with a select confirmation switch that detects the select operation of the shift lever, and the position detection circuit has a function for judging the shift position in the manual mode from the output from the select confirmation switch and the output from each sensor. The shift position detecting device according to claim 1.   The position detection circuit has a function of detecting a shift position based on the output of the remaining sensor and enabling a temporary operation when an abnormality occurs in one of the sensors. The shift position detecting device according to claim 1.   6. The shift position detection device according to claim 5, wherein the position detection circuit has a function of making operation impossible when abnormality occurs in two or more of the sensors.