JP2017125738A - Steering angle sensor inspection device - Google Patents

Abstract

An inspection device for a rudder angle sensor capable of inspecting an abnormal mounting of the rudder angle sensor before leaving the vehicle. A steering angle sensor inspection device for inspecting a steering angle sensor for detecting a steering angle of a steering device using a detection gear attached to a steering shaft at a predetermined rotation angle, wherein the steering shaft is neutral. A first value that is the rotation angle of the detection gear from the position to the maximum steering state to the right, and the detection from the state in which the steering shaft is in the neutral position to the maximum steering to the left An acquisition unit that acquires a second value that is a rotation angle of the gear, and a determination unit that determines whether or not the difference between the absolute value of the first value and the absolute value of the second value is 360 degrees or more. And an output unit that outputs an inspection result indicating that the detection gear is not properly assembled to the steering shaft when it is determined that the difference is 360 degrees or more. [Selection] Figure 1

Description

  The present invention relates to an apparatus for inspecting whether or not a steering angle sensor is assembled in a vehicle.

  Patent Document 1 describes that a steering angle sensor that detects a steering angle of a vehicle is assembled to a steering shaft in a predetermined direction.

JP 2010-271180 A

  However, when the rudder angle sensor is assembled to the steering shaft in a predetermined direction, there is a possibility that the detection gear of the rudder angle sensor is attached in a state where it is shifted from the normal position by an integral multiple of 360 degrees. Normally, such an assembly abnormality of the rudder angle sensor is found based on a neutral point of the rudder angle learned by actually running sufficiently after the vehicle is delivered. For example, it is estimated that the rudder angle in the straight traveling state of the vehicle detected using the output of the vehicle speed sensor, the yaw rate sensor, etc. is the neutral point. Along with learning such a neutral point, a rotational shift of the detection gear is detected.

  If an assembly abnormality of the rudder angle sensor is found after learning the neutral point, the vehicle that has been delivered and traveled sufficiently with the assembly abnormality will be re-entered. Therefore, there is a possibility that repairs and inspections become large-scale and it becomes difficult to return to a state in which re-loading is possible. Therefore, it is desirable that the assembled state of the rudder angle sensor can be inspected before leaving the vehicle after the rudder angle sensor is assembled to the vehicle.

  In view of the above problems, the present invention provides a rudder angle sensor inspection device capable of inspecting a steering angle sensor assembly abnormality before leaving a vehicle.

  The present invention relates to a steering angle sensor inspection device that inspects a steering angle sensor that detects a steering angle of a steering device using a detection gear attached to a steering shaft at a predetermined rotation angle. A first value that is a rotation angle of the detection gear from a neutral position to a state in which the steering gear is steered to the maximum in the right direction, and a maximum steering in the left direction from the state in which the steering shaft is in the neutral position. Whether the difference between the absolute value of the first value and the absolute value of the second value is 360 degrees or more, and the acquisition unit that acquires the second value that is the rotation angle of the detection gear up to the state A determination unit for determining whether or not the difference is 360 degrees or more, an inspection result indicating that the detection gear is not properly assembled to the steering shaft is output. And an output unit.

  According to the present invention, the rotation angle of the detection gear from the state in which the steering shaft is in the neutral position to the state in which the steering shaft is steered to the maximum in the right direction and the steering in the left direction from the state in which the steering shaft is in the neutral position are maximally steered. It is determined whether or not the rotation angle of the detection gear up to the state has an unbalanced relationship in which a difference of 360 degrees or more occurs between the absolute values of each other. If an abnormal assembly of the detection gear that is in an unbalanced relationship is found, the steering angle sensor that has been reassembled on the steering shaft in a state where the mounting angle position of the detection gear is adjusted can be inspected again. As described above, the steering angle sensor assembly abnormality can be easily inspected by a simple process that can be performed in a vehicle stop state at any time including before leaving the vehicle, in which the left and right rotation angles of the detection gear are compared.

  ADVANTAGE OF THE INVENTION According to this invention, the inspection apparatus of the steering angle sensor which can test | inspect the assembly abnormality of a steering angle sensor before leaving the vehicle can be provided.

The block diagram which shows the structure of the inspection apparatus of the rudder angle sensor which concerns on embodiment of this invention. The flowchart explaining the work procedure of the vehicle maintenance performed using the inspection apparatus of the rudder angle sensor which concerns on embodiment of this invention. The flowchart explaining the process sequence which the test | inspection apparatus of the rudder angle sensor which concerns on embodiment of this invention performs.

Hereinafter, embodiments will be described in detail with reference to the drawings.
[Overview]
The steering angle sensor inspection device according to the present embodiment has a rotation angle at which the steering shaft can be maximally steered from the neutral position to the right, and from the state where the steering shaft is in the neutral position to the left. It is determined whether or not the steerable rotation angle is in an unbalanced relationship in which a difference of 360 degrees or more occurs between the absolute values. If an abnormal assembly of the detection gear that is in an unbalanced relationship is found, the steering angle sensor that is reassembled on the steering shaft in a state where the angular position of the detection gear is adjusted can be inspected again. As described above, the steering angle sensor assembly abnormality can be easily inspected by a simple process that can be performed in a vehicle stop state at any time including before leaving the vehicle, in which the left and right rotation angles of the detection gear are compared.

  FIG. 1 shows a configuration of an inspection apparatus 1 that is an inspection apparatus for a steering angle sensor according to the present embodiment. The inspection device 1 is an ECU (Electrical Control Unit) such as a steering ECU, for example, and inspects whether or not the rudder angle sensor 3 assembled to the steering shaft 2 is assembled.

[Configuration of rudder angle sensor]
FIG. 1 schematically shows an assembled state of the rudder angle sensor 3 with respect to the steering shaft 2 when viewed in the axial direction of the steering shaft 2. The rudder angle sensor 3 includes a rotating part 3a and a sensor part 3b. The rotating part 3 a is attached to the outer peripheral side of the steering shaft 2 and rotates integrally with the steering shaft 2. The rotating unit 3a includes a detection gear G (only a part of the detection gear G is conceptually shown in FIG. 1 for convenience). The detection gear G transmits the rotation angle of the rotation unit 3a, that is, the rotation angle of the steering shaft 2 to the sensor unit 3b as the rotation unit 3a rotates.

  The rotating part 3a is attached in a state of being engaged with an engaging part E1 and an engaging part E2 formed 180 degrees apart on the outer periphery of the steering shaft 2. The engaging part E1 and the engaging part E2 have different shapes, for example, have a hole shape. Therefore, the rotating portion 3a is attached to the steering shaft 2 at a predetermined rotation angle (hereinafter, the rotation angle is referred to as “reference angle position”) with the engagement portions E1 and E2 as marks. However, the rotation unit 3a including the detection gear G is shifted to the right or left by an integral multiple of 360 degrees from the reference angular position (that is, the rotation unit 3a is shown in the illustration of the rudder angle sensor 3). In a state of rotational deviation with respect to the casing that does not.

  The sensor unit 3b detects the rotation angle transmitted from the detection gear G by a method using, for example, a magnetoresistive element or an optical coupling element. The sensor unit 3b outputs information on the detected rotation angle by a detection signal m.

[Configuration of inspection equipment]
The inspection device 1 includes a communication unit 1a, an acquisition unit 1b, a determination unit 1c, and an output unit 1d.

  The communication unit 1a is a communication interface connected to a communication bus Z conforming to a vehicle communication standard such as CAN (Controller Area Network). The communication unit 1a communicates with the maintenance tool 10 connected to the vehicle via the communication bus Z. The maintenance tool 10 is connected to a predetermined location (for example, a gateway device for vehicle communication) capable of communication via the communication bus Z in a factory or a dealer. The maintenance tool 10 includes several diagnostic target devices (ECUa, ECUb, inspection device 1 and the like in FIG. 1) connected to the communication bus Z and a scan tool that performs so-called diagnostic communication for performing vehicle self-diagnosis. Device.

  When the maintenance tool 10 inspects the assembled state of the rudder angle sensor 3, a command A for starting the inspection mode of the rudder angle sensor 3 is sent to the communication unit 1 a via the communication bus Z in accordance with an input operation from an operator. And send. The communication unit 1a inputs the received command A to the acquisition unit 1b.

  The acquisition unit 1b follows the command A input from the communication unit 1a, and based on the detection signal m input from the rudder angle sensor 3, determines the rotation angle associated with left and right steering steering of the steering wheel when the vehicle is stopped. Get like. That is, the acquisition unit 1b is the rotation angle of the detection gear G from the state in which the steering shaft is in the neutral position to the state in which the steering shaft is steered to the maximum (hereinafter, may be referred to as “first value”). The rotation angle of the detection gear G from the state in which the steering shaft is in the neutral position to the state in which the steering shaft is steered to the maximum (hereinafter, may be referred to as “second value”) is stored.

  Since the mounting angle position of the detection gear G with respect to the steering shaft 2 has an uncertainty of an integral multiple of 360 degrees, the mounting angle position of the detection gear G becomes the reference angle position before the inspection mode of the steering angle sensor 3 is executed. Whether or not they match is unknown. The acquisition unit 1b inputs the stored information B indicating the first value and the second value to the determination unit 1c.

  The determination unit 1c calculates a difference between the absolute value of the first value and the absolute value of the second value input from the acquisition unit 1b, and determines whether the difference is 360 degrees or more. When the difference is 360 degrees or more, the mounting angle position of the detection gear G with respect to the steering shaft 2 is shifted by one rotation or more. In this case, if the absolute value of the first value is larger than the absolute value of the second value, the mounting angle position is shifted to the right rotation side, and the absolute value of the second value is equal to the first value. If it is larger than the absolute value, the mounting angle position is shifted to the left rotation side. On the other hand, when the difference is less than 360 degrees, the mounting angle position of the detection gear G with respect to the steering shaft 2 is normal. The determination unit 1c inputs a determination result C as to whether or not the difference is 360 degrees or more to the output unit 1d.

  The output unit 1d is based on the determination result C input from the determination unit 1c, and if the difference is 360 degrees or more, the inspection result indicating that the detection gear G is assembled and thus the steering angle sensor 3 is abnormal. When the difference is less than 360 degrees, the inspection result D indicating that the steering angle sensor 3 is assembled normally is transmitted to the maintenance tool 10 via the communication unit 1a and the communication bus Z, respectively.

  Based on the inspection result D received from the inspection apparatus 1, the maintenance tool 10 displays a display indicating that the steering angle sensor 3 is abnormal if the steering angle sensor 3 is abnormally assembled. If the steering angle sensor 3 is normal, the maintenance tool 10 indicates normal assembly. Display.

[Procedure for maintenance work to inspect the rudder angle sensor]
Next, an operation procedure for inspecting the rudder angle sensor 3 assembled to the steering shaft 2 will be described with reference to the flowchart of FIG.

  First, in step S101, an operator connects the maintenance tool 10 to a predetermined location of a vehicle in a stopped state. Next, in step S102, the operator performs an instruction operation to start the inspection mode of the rudder angle sensor 3 on the maintenance tool 10, thereby executing the inspection mode of the rudder angle sensor 3. In the execution of the inspection mode, the operator follows the work screen displayed on the vehicle interior display or the like, or performs the automatic steering control by the ECU, so that the steering wheel is stationary in both the left and right directions. The inspection result is displayed on the display screen of the maintenance tool 10.

  If the assembly of the steering angle sensor 3 is abnormal in the subsequent step S103, the process proceeds to step S104. If the assembly of the steering angle sensor 3 is normal in the step S103, the flow ends. In step S104, the operator corrects the assembly of the steering angle sensor 3 by adjusting the mounting angle position of the detection gear G. After step S104, the process returns to step S102 and the inspection mode of the steering angle sensor 3 is executed again.

[Operation of rudder angle sensor inspection device]
Next, with reference to the flowchart of FIG. 3, the process procedure of the inspection mode of the rudder angle sensor 3 performed by the inspection apparatus 1 will be described. The flow is executed by a processor included in a computer included in the inspection apparatus 1 reading and executing a program stored in an internal or external storage medium of the inspection apparatus 1.

  The flow is started when an operator first performs an operation for starting the inspection mode of the rudder angle sensor 3 on the maintenance tool 10. The ECU that has received the command A is in a state of functioning as the inspection apparatus 1, that is, the ECU configures the communication unit 1a, the acquisition unit 1b, the determination unit 1c, and the output unit 1d.

  In step S201, the acquisition unit 1b, to which the command A is input from the communication unit 1a, determines that the steering shaft is neutral based on the detection signal m input from the rudder angle sensor 3 when the steering wheel is stopped in the right direction. The rotation angle of the detection gear G from the state in the position to the state in which the steering is maximized in the right direction, that is, the first value is acquired.

  In the subsequent step S202, the acquisition unit 1b determines that the steering shaft is in the leftward direction from the neutral position based on the detection signal m input from the rudder angle sensor 3 as the steering wheel is turned leftward. The rotation angle of the detection gear G up to the limited steering state, that is, the second value is acquired.

  In step S203, the determination unit 1c calculates a difference between the absolute value of the first value and the absolute value of the second value based on the information B input from the acquisition unit 1b. It is determined whether it is 360 degrees or more. When the determination unit 1c determines that the difference is 360 degrees or more in step S203, a determination result C indicating that the difference is 360 degrees or more is input from the determination unit 1c to the output unit 1d, and step S204 is performed. When the determination unit 1c determines that the difference is not 360 degrees or more in step S203, a determination result C indicating that the difference is not 360 degrees or more is input from the determination unit 1c to the output unit 1d. The process proceeds to S205.

  In step S204, the output unit 1d outputs an inspection result D indicating that the assembly of the rudder angle sensor 3 is abnormal based on the input determination result C. The inspection result D is output to the communication bus Z by the communication unit 1a. The maintenance tool 10 that has received the inspection result D via the communication bus Z displays on the screen that the installation of the rudder angle sensor 3 is abnormal.

  In step S205, the output unit 1d outputs an inspection result D indicating that the assembly of the rudder angle sensor 3 is normal based on the input determination result C. The inspection result D is output to the communication bus Z by the communication unit 1a. The maintenance tool 10 that has received the inspection result D via the communication bus Z displays on the screen that the assembly of the rudder angle sensor 3 is normal.

  When step S204 ends or step S205 ends, this flow ends. It should be noted that the prior relationship between step S201 and step S202 may be interchanged.

[Effects of the embodiment, etc.]
As described above, the inspection device 1 that is the inspection device for the steering angle sensor of the present embodiment includes the rotation angle of the detection gear G from the state in which the steering shaft is in the neutral position to the state in which the steering shaft is steered to the maximum in the right direction, The rotation angle of the detection gear G from the state in which the steering shaft is in the neutral position to the state in which the steering shaft is steered to the maximum in the left direction has an unbalanced relationship in which a difference of 360 degrees or more is generated between the absolute values of each other. It is determined whether or not. If an abnormal assembly of the detection gear G that is in an unbalanced relationship is found, the steering angle sensor 3 that has been reassembled on the steering shaft 2 with the angular position of the detection gear G adjusted can be inspected again. Become. As described above, the steering angle sensor assembly abnormality can be easily inspected by a simple process that can be performed at any time including before the delivery, that is, comparing the left and right rotation angles of the detection gear G. .

  As described above, it is possible to provide a rudder angle sensor inspection apparatus capable of inspecting a steering angle sensor assembly abnormality before leaving the vehicle.

  The present invention is applicable to a vehicle having a steering device such as an electric steering.

DESCRIPTION OF SYMBOLS 1 Inspection apparatus 1a Communication part 1b Acquisition part 1c Determination part 1d Output part 2 Steering shaft 3 Steering angle sensor 3a Rotation part 3b Sensor part 10 Maintenance tool A Command B Information C Determination result D Inspection result E1, E2 Engagement part G Detection gear m Detection signal

Claims (1)

A steering angle sensor inspection device that inspects a steering angle sensor that detects a steering angle of a steering device using a detection gear attached to a steering shaft at a predetermined rotation angle,
A first value which is a rotation angle of the detection gear from a state where the steering shaft is in a neutral position to a state where the steering shaft is steered to the maximum to the right; and a maximum value in a left direction from a state where the steering shaft is in the neutral position An obtaining unit that obtains a second value that is a rotation angle of the detection gear until a limited steering state;
A determination unit that determines whether or not a difference between the absolute value of the first value and the absolute value of the second value is equal to or greater than 360 degrees;
When it is determined that the difference is equal to or greater than 360 degrees, the steering angle sensor includes an output unit that outputs an inspection result indicating that the detection gear is not properly assembled to the steering shaft. apparatus.

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