JP2015017645A - Shift position determination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a failure of an arithmetic unit which determines a shift position of a shift lever.SOLUTION: Arithmetic means has a main determination process as a process of determining a shift position on the basis of first positions detected by two first position detection means and second positions detected by two second position detection means, and a sub determination process as a process of determining a shift position on the basis of the first positions detected by the two first position detection means and the second positions detected by the two second position detection means, and determines a failure of itself on the basis of a result of comparison between the shift position determined in the main determination process and the shift position determined in the sub determination process.

Description

  The present invention relates to a shift position determination device.

  Currently, a shift-by-wire vehicle, that is, a vehicle in which a shift position of a shift lever is detected by a sensor and a CPU (Central Processing Unit) controls a transmission based on the detection result is widely used (Patent Document 1 below). reference). In this shift-by-wire vehicle, a technique for making the sensor redundant has been devised in order to detect a failure of the sensor. For example, in Patent Document 2 below, a shift operation for determining a failure of a switch circuit by making two systems of switch circuits, which are detection circuits for the shift position of the shift lever, and comparing the detection results of the two systems of switch circuits An input device is disclosed. Further, in addition to the following Patent Document 2, the sensor includes two sensors that detect the shift position of the shift lever and output a voltage corresponding to the shift position as a detection signal, and the upper limit value and the lower limit value of the output voltage of the two sensors. Are the same, but the output voltage of one sensor changes from the upper limit to the lower limit based on the displacement from the reference point of the shift position, and the output voltage of the other sensor changes from the lower limit to the upper limit. A shift position determination device that determines the failure of the sensor based on whether the total value of the output voltages of the two sensors is within the range between the total value of the upper limit value and the lower limit value and the upper limit value is conceivable. .

JP 2013-1368 A JP 2008-223821 A

  In the prior art, a plurality of sensors for detecting the shift position of the shift lever are provided, and the malfunction of the sensor is detected based on the detection result. The shift position of the shift lever is determined based on the detection result of the sensor. There is no detection of bugs such as software bugs in the arithmetic unit or internal malfunctions.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to detect a malfunction of an arithmetic device that determines a shift position of a shift lever.

  In order to achieve the above object, in the present invention, as a first solving means, two first position detecting means for detecting a position (first position) in a first direction of a shift lever mounted on a vehicle, Detection of two second position detection means for detecting a position (second position) in a second direction orthogonal to the first direction of the shift lever, detection of the two first position detection means, and two second position detection means A shift position determination device comprising calculation means for determining a shift position in a shift pattern of a shift lever based on a result, wherein the calculation means includes the first position detected by the two first position detection means. A main determination process that is a process of determining a shift position based on the second positions detected by the two second position detecting means, and the two detected by the two first position detecting means. A sub-determination process that is a process for determining a shift position based on one position and the second position detected by two second position detection means, and a shift position determined by the main determination process; A means is adopted in which its own defect is determined based on a comparison result with the shift position determined by the sub-determination process.

  In the present invention, as the second solving means, in the first solving means, the main determination process obtains an average value of the first positions detected by the two first position detecting means, The sub-determination process is a process of obtaining an average value of the second position detected by the second position detection means, and determining a position including the average value of the first position and the average value of the second position as a shift position. Obtains a first shift position consisting of a first position detected by one of the two first position detection means and a second position detected by one of the two second position detection means, and two A second shift position consisting of a first position detected by the other of the first position detecting means and a second position detected by the other of the two second position detecting means is obtained, and the first shift position and A process of determining the shift position an average value of the second shift position, employing the means of.

  In the present invention, as the third solving means, in the first solving means, the main determination process obtains an average value of the first positions detected by the two first position detecting means, The sub-determination process is a process of obtaining an average value of the second position detected by the second position detection means, and determining a position including the average value of the first position and the average value of the second position as a shift position. Adopts means for determining the shift position by the same process as the main determination process.

  In the present invention, as the fourth solving means, in the first solving means, the main determination processing is performed by the first position detected by one of the two first position detecting means and the two second position detecting means. A first shift position comprising a second position detected by one of the means and a first position detected by the other of the two first position detection means and the other of the two second position detection means; A process of obtaining a second shift position including the detected second position and determining an average value of the first shift position and the second shift position as a shift position. The sub determination process is the main determination process. The shift position determination process is performed by the same process as that described above.

  According to the present invention, the computing means determines the malfunction of the computing means by determining its own malfunction based on the comparison result between the shift position determined by the main determination process and the shift position determined by the sub determination process. Can be detected.

It is a schematic block diagram of the shift position determination apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the function structure of the main determination process Mp and the sub determination process Sp which are performed by the microcomputer 4 in one Embodiment of this invention. It is a flowchart which shows operation | movement of the shift position determination apparatus which concerns on one Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
The shift position determination device according to the present embodiment is mounted on a vehicle and determines a shift position in a shift pattern of a shift lever SL operated by a driver. As shown in FIG. A sensor A2, a select sensor B1, a select sensor B2, a sensor signal processing unit C, and a microcomputer M are provided.

  The shift lever SL shown in FIG. 1 has four types of shifts “H (basic)”, “B (brake)”, “R (reverse)”, “N (neutral)”, and “D (drive)”. A shift pattern consisting of positions is applied.

  Further, the shift sensors A1 and A2 and the sensor signal processing unit C constitute a first position detecting unit in the present embodiment. Further, the select sensors B1 and B2 and the sensor signal processing unit C are second position detecting means in the present embodiment. Further, the microcomputer M is a calculation means in this embodiment.

  The shift sensor A1 detects a shift position (first position) in the X-axis direction (first direction) on the two-dimensional plane of the shift lever SL, and a detection signal (voltage signal) indicating the shift position in the X-axis direction. Is output to the microcomputer M. Similarly, the shift sensor A2 also detects the shift position of the shift lever SL in the X-axis direction, and outputs a detection signal (voltage signal) indicating the shift position in the X-axis direction to the microcomputer M.

  The X-axis direction in the two-dimensional plane is a direction along the length direction of the vehicle. Moreover, the Y-axis direction in the two-dimensional plane mentioned later is a direction along the width direction of the vehicle. That is, the Y-axis direction is a direction orthogonal to the X-axis direction.

  The select sensor B1 detects a shift position (second position) in the Y-axis direction (second direction) on the two-dimensional plane of the shift lever SL, and a detection signal (voltage signal) indicating the shift position in the Y-axis direction. Is output to the microcomputer M. Similarly, the select sensor B2 also detects the shift position of the shift lever SL in the Y-axis direction, and outputs a detection signal (voltage signal) indicating the shift position in the Y-axis direction to the microcomputer M. The shift sensors A1 and A2 and the select sensors B1 and B2 are inductive sensors or hall sensors. The shift position in the X-axis direction and the Y-axis direction is a position based on the origin (0 point).

  The sensor signal processing unit C is an ASIC (Application Specific Integrated Circuit) configured by an A / D converter or the like that performs A / D conversion on detection signals output from the shift sensors A1 and A2 and the select sensors B1 and B2. The detection signals from the shift sensors A1 and A2 and the select sensors B1 and B2 are subjected to predetermined processing and output to the microcomputer M. The sensor signal processing unit C is mounted on the same substrate (not shown) together with the microcomputer M.

  As shown in FIG. 1, the microcomputer M includes a ROM (Read Only Memory) 11, a RAM (Random Access Memory) 12, and a CPU (Central Processing Unit) 13. The microcomputer M is mounted on the same substrate (not shown) together with the sensor signal processing unit C.

The ROM 11 is a non-volatile memory that stores various arithmetic control programs executed by the CPU 13 and other data.
The RAM 12 is a volatile memory that is used as a working area as a temporary storage destination of data when the CPU 13 executes various operations by executing an arithmetic control program.

  The CPU 13 is electrically connected to the ROM 11 and the RAM 12 and is also electrically connected to the sensor signal processing unit C. Various types of arithmetic control programs stored in the ROM 11 and various signals input from the sensor signal processing unit C are used. And the shift position of the shift lever SL is determined.

  That is, the CPU 13 executes the main determination process Mp and the sub determination process Sp shown in FIG. 2 based on the arithmetic control program stored in the ROM 11. As shown in FIG. 2, the main determination process Mp obtains an average value of the shift positions in the X-axis direction detected by the shift sensors A1 and A2, and shifts in the Y-axis direction detected by the select sensors B1 and B2. Is obtained, and the position on the two-dimensional plane consisting of the average value of the shift position in the X-axis direction and the average value of the shift position in the Y-axis direction is determined as the shift position of the shift lever SL.

  Further, as shown in FIG. 2, the sub-determination process Sp calculates a first shift position consisting of a shift position in the X-axis direction detected by the shift sensor A1 and a shift position in the Y-axis direction detected by the select sensor B1. And obtaining a second shift position consisting of the shift position in the X-axis direction detected by the shift sensor A2 and the shift position in the Y-axis direction detected by the select sensor B2, and obtaining the first shift position and the second shift position. This is a process for determining the average value as the shift position of the shift lever SL.

  Then, the CPU 13 determines whether or not the shift position determined by the main determination process Mp matches the shift position determined by the sub determination process Sp, and determines a malfunction of the microcomputer M based on the determination result.

Next, the operation of the shift position determination apparatus configured as described above will be described with reference to FIG.
For example, the driver operates the shift lever SL when switching the transmission (not shown) while driving the vehicle. Each of the shift sensors A1 and A2 outputs a detection signal indicating a shift position in the X-axis direction to the sensor signal processing unit C in accordance with the movement of the shift lever SL by the driver's operation. Each of the select sensors B1 and B2 also outputs a detection signal indicating a shift position in the Y-axis direction to the sensor signal processing unit C according to the movement of the shift lever SL.

  The sensor signal processing unit C performs predetermined processing on the detection signals from the shift sensors A1 and A2 and the select sensors B1 and B2 and outputs them to the CPU 13. The CPU 13 determines the shift position of the shift lever SL based on the detection signals input from the shift sensors A1 and A2 and the select sensors B1 and B2 via the sensor signal processing unit C. Here, the CPU 13 performs the following characteristic operations.

  First, the CPU 13 executes the main determination process Mp and the sub determination process Sp in parallel. That is, when the detection signal is input from the shift sensors A1 and A2 and the select sensors B1 and B2 via the sensor signal processing unit C in the main determination process Mp (step S1), the CPU 13 causes the shift sensors A1 and A2 to An average value of detected shift positions in the X-axis direction is obtained (step S2), an average value of shift positions in the Y-axis direction detected by the select sensors B1 and B2 is obtained (step S3), and a shift position in the X-axis direction is obtained. The position on the two-dimensional plane consisting of the average value of and the average value of the shift position in the Y axis direction is determined as the shift position of the shift lever SL (step S4).

  In the sub determination process Sp, when the detection signals are input from the shift sensors A1 and A2 and the select sensors B1 and B2 via the sensor signal processing unit C in the sub determination process Sp (step S5), the CPU 13 detects the detection signal. A first shift position consisting of the shift position in the X-axis direction and the shift position in the Y-axis direction detected by the select sensor B1 is obtained (step S6), and the shift position in the X-axis direction detected by the shift sensor A2 and the select position are selected. A second shift position consisting of the shift position in the Y-axis direction detected by the sensor B2 is obtained (step S7), and the average value of the first shift position and the second shift position is determined as the shift position of the shift lever SL ( Step S8).

  Subsequently, the CPU 13 determines a malfunction of the microcomputer M based on a comparison result between the shift position determined by the main determination process Mp and the shift position determined by the sub determination process Sp. That is, the CPU 13 determines whether or not the shift position determined by the main determination process Mp matches the shift position determined by the sub determination process Sp (step S9). Note that the malfunction of the microcomputer M is a bug in the arithmetic control program, a failure of the ROM 11, RAM 12, and CPU 13.

  The CPU 13 determines that there is no malfunction in the microcomputer M if they match (if YES), and shift position information indicating the shift position of the shift lever SL determined by the main determination process Mp (or sub determination process Sp), It transmits to mission ECU (Electronic Control Unit) (not shown) (step S10). When the mission ECU receives the shift position information from the CPU 13, the mission ECU controls an actuator (not shown) for driving a transmission (not shown) based on the shift position information.

  On the other hand, if they do not match (in the case of NO), the CPU 13 determines that there is a malfunction in the microcomputer M, and transmits malfunction information indicating the malfunction of the microcomputer M to the mission ECU (step S11). The CPU 13 determines whether or not the shift position determined by the main determination process Mp matches the shift position determined by the sub determination process Sp in the process of step S7, but there is a slight difference. Even so, it may be determined that they match.

  According to the present embodiment, the CPU 13 determines the malfunction of the microcomputer M based on the comparison result between the shift position determined by the main determination process Mp and the shift position determined by the sub determination process Sp. The malfunction of the microcomputer M that determines the shift position of the shift lever SL can be detected.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the main determination process Mp and the sub determination process Sp are different processes, but the present invention is not limited to this. That is, the main determination process Mp and the sub determination process Sp may be the same process.

  For example, the main determination process Mp is the same as the main determination process Mp shown in FIG. 2, that is, the average value of the shift positions in the X-axis direction detected by the shift sensors A1 and A2 is obtained as in FIG. The average value of the shift positions in the Y-axis direction detected by the select sensors B1 and B2 is obtained, and the position on the two-dimensional plane composed of the average value of the shift positions in the X-axis direction and the average value of the shift positions in the Y-axis direction is obtained. This is a process for determining the shift position of the shift lever SL, and the sub determination process Sp may be determined by the same process as the main determination process Mp.

  The main determination process Mp is the same as the sub determination process Sp shown in FIG. 2, that is, the X-axis direction shift position detected by the shift sensor A1 and the Y-axis direction shift position detected by the select sensor B1. And a second shift position consisting of a shift position in the X-axis direction detected by the shift sensor A2 and a shift position in the Y-axis direction detected by the select sensor B2, and obtaining the first shift position. This is a process of determining the average value of the position and the second shift position as the shift position of the shift lever SL, and the sub determination process Sp may be determined by the same process as the main determination process Mp.

(2) In the above embodiment, there is one sub determination process Sp, but the present invention is not limited to this. For example, the CPU 13 executes a plurality of sub-determination processes Sp that execute different processes or the same process in parallel with the main determination process Mp, and the shift position determined by each sub-determination process Sp and the main determination process Mp. You may make it detect the malfunction of the microcomputer M by comparing with the determined shift position. Further, the CPU 13 may detect a malfunction of the microcomputer M by comparing the shift positions determined by the respective sub determination processes Sp. Further, the combinations of the sub determination processes can be combined by the number of sensors. For example, in addition to the combination of the shift position in the X-axis direction detected by the shift sensor A1 and the shift position in the Y-axis direction detected by the select sensor B1, the shift position in the X-axis direction detected by the shift sensor A1 and the select It is also possible to calculate the shift position in the Y-axis direction detected by the sensor B2.

  A1, A2 ... shift sensor, B1, B2 ... select sensor, C ... sensor signal processing unit, M ... microcomputer, 11 ... ROM, 12 ... RAM, 13 ... CPU, Mp ... main judgment process, Sp ... sub judgment process

Claims (4)

Two first position detecting means for detecting the position (first position) of the shift lever mounted on the vehicle in the first direction, and the position (second position) of the shift lever in the second direction orthogonal to the first direction. ) And two arithmetic units for determining a shift position in the shift pattern of the shift lever based on the detection results of the two first position detectors and the two second position detectors. A shift position determination device for
The computing means is
A main determination process that is a process of determining a shift position based on the first position detected by two first position detection means and the second position detected by two second position detection means;
A sub determination process that is a process of determining a shift position based on the first position detected by the two first position detection means and the second position detected by the two second position detection means. Equipped,
A shift position determination device that determines its own defect based on a comparison result between the shift position determined by the main determination process and the shift position determined by the sub determination process. The main determination process obtains an average value of the first positions detected by the two first position detection means, obtains an average value of the second positions detected by the two second position detection means, It is a process of determining a position consisting of an average value of the first position and an average value of the second position as a shift position,
The sub-determination process obtains a first shift position including a first position detected by one of the two first position detection means and a second position detected by one of the two second position detection means. And determining a second shift position comprising a first position detected by the other of the two first position detecting means and a second position detected by the other of the two second position detecting means, The shift position determination apparatus according to claim 1, wherein the shift position determination apparatus is a process of determining an average value of a shift position and the second shift position as a shift position. The main determination process obtains an average value of the first positions detected by the two first position detection means, obtains an average value of the second positions detected by the two second position detection means, It is a process of determining a position consisting of an average value of the first position and an average value of the second position as a shift position,
The shift position determination device according to claim 1, wherein the sub determination process is a process of determining a shift position by the same process as the main determination process. The main determination process obtains a first shift position including a first position detected by one of the two first position detection means and a second position detected by one of the two second position detection means. And determining a second shift position comprising a first position detected by the other of the two first position detecting means and a second position detected by the other of the two second position detecting means, A process of determining an average value of a shift position and the second shift position as a shift position;
The shift position determination device according to claim 1, wherein the sub determination process is a process of determining the shift position by the same process as the main determination process.

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