JP2010190583A - Apparatus for display of vehicle tilt angle, and method for correcting middle point of tilt angle sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tilt angle sensor middle point correction method capable of performing middle point correction by a simple structure, and to provide a vehicle tilt angle display apparatus. <P>SOLUTION: When a stopping condition acquisition means 4 detects the stopping of a vehicle, a middle point correction control unit 17 detects that an oil filler port lid has been opened and that an oil filler port SW 9 has been turned ON, determines that the vehicle has stopped at a gas station for refueling, performs middle point correction control, acquires a new longitudinal tilt angle reference value and lateral tilt angle reference value, stores them in a longitudinal tilt angle reference value storage unit 15a and a lateral tilt angle reference value storage unit 16a, respectively, and updates them with the new longitudinal tilt angle reference value and lateral tilt angle reference value. Thereafter, correction calculation units 15, 16 can thereby perform correction calculations using the newly updated longitudinal tilt angle reference value and lateral tilt angle reference value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tilt angle display device that detects and displays a tilt angle of a vehicle and a midpoint correction method for the tilt angle sensor.

As an inclination angle display device attached to a vehicle, for example, an apparatus using a mechanical level that also serves as an inclination angle sensor as shown in FIG. 4 is known.
In the tilt angle display device 100 shown in FIG. 4, a storage spherical shell 101 made of a transparent resin is fixed to a fixed frame 102 for mounting the tilt angle display device 100. A floating sphere 103 is disposed in the storage spherical shell 101. A support shaft (not shown) extends from the storage spherical shell 101 to the front side of the drawing sheet from the back side of the drawing sheet in FIG. The floating sphere 103 is provided with a window portion 106 opened in a slit shape, and a front / rear tilt angle indicator needle 104 attached to a rotation shaft supported by walls on both sides of the window portion is provided to be rotatable back and forth. Yes.
The floating sphere 103 is made of resin, and a front / rear tilt angle scale 105 is displayed around the front-side window 106 so as to correspond to the front / rear tilt angle indicating needle 104 in the front / rear direction.

Further, a horizontal inclination angle indicating line 107 indicating a horizontal line is displayed on the front side of the floating sphere 103, and a horizontal inclination angle corresponding to the horizontal inclination of the horizontal inclination angle indicating line 107 is displayed on the fixed frame 102. A scale 108 is displayed.
The floating sphere 103 is provided with a hollow portion on the upper side in FIG. 4 and is supported by the support shaft in a state of floating in the silicone oil filled in the storage spherical shell 101, and the rotation of the fixed frame 102 in the left-right direction. Is always oriented vertically. Accordingly, when the upper side of the floating sphere 103 is always directed vertically upward with respect to the rotation of the fixed frame 102 in the left-right direction, the horizontal tilt angle indicating line 107 indicates the horizontal tilt angle.
Further, the front / rear inclination angle indicating needle 104 is configured such that a portion in the window portion 106 is bent downward in an L shape, a vertical portion thereof is supported by the rotating shaft, and a center of gravity is provided on the lower end side of the vertical portion. . Accordingly, when the vertical portion of the front / rear inclination angle indicating needle 104 is always directed in the vertical direction with respect to the rotation of the fixed frame 102 in the front / rear direction, the front / rear inclination angle indicating needle 104 indicates the front / rear inclination angle.
Incidentally, the silicone oil filled in the storage spherical shell 101 serves as a damper that suppresses vibrations of the movement of the floating sphere 103 and the forward / backward tilt angle indicating needle 104, and a lubricant for the support shaft and the rotary shaft. .

  However, when a level indicator such as that shown in FIG. 4 is used as a tilt angle display device for a moving object such as a vehicle, the tilt angle is shifted due to acceleration caused by acceleration / deceleration motion and turning motion, It is not suitable as a tilt angle display device used during vehicle travel.

  In addition, since the tilt angle sensor attached to the vehicle has an installation error that occurs when the vehicle is attached to the vehicle, an environmental error due to a temperature change, etc., and a chronological error due to a secular change, various automatic correction methods corresponding to them. Is adopted. For example, a state where the vehicle is stopped and neither driving force nor braking force is applied to the vehicle (hereinafter referred to as a neutral state) is detected, and the output level of the tilt angle sensor at that time is set as the tilt angle reference value. A technique related to an automatic control device for an inclination angle sensor that automatically performs update correction of the inclination angle 0 (zero) (corresponding to “middle point correction” in the present invention) is disclosed (for example, see Patent Document 1).

  Further, in Patent Document 2, an inclination angle sensor installed in a vehicle samples and extracts an inclination angle detection value at every predetermined distance interval on the road, and an average value of the inclination angle detection values sampled and extracted at every predetermined distance interval. Is disclosed as a tilt angle reference value.

JP 2001-336618 A (see paragraph numbers [0036] to [0037] and FIGS. 7 and 9) JP 2008-138620 A (see FIG. 2)

  However, in the techniques described in Patent Document 1 and Patent Document 2, there is no guarantee that the tilt angle reference point is accurately captured, and an error may occur conversely by performing midpoint correction.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a midpoint correction method of a tilt angle sensor and a vehicle tilt angle display device capable of correcting the midpoint with a simple configuration.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a refueling method in a midpoint correction method of an inclination angle sensor that is provided in a vehicle and detects an inclination angle of a road surface in contact with the vehicle. When the refueling detection means to detect detects that it is during refueling, it acquires an inclination angle reference value with an inclination angle of 0, and updates the previously acquired inclination reference value.

  The invention according to claim 2 is provided in the vehicle and detects an inclination angle of a road surface in contact with the vehicle, an arithmetic processing unit that calculates an inclination angle based on a signal from the inclination angle sensor, An inclination angle display device that displays a corrected inclination angle, and an inclination angle display device that includes an oil supply detection unit that detects when it is being refueled, and the arithmetic processing unit is that the oil supply detection unit is at the time of oil supply An inclination reference value acquisition means for acquiring an inclination reference value having an inclination angle of 0 when detecting the inclination angle, and an inclination reference in which the inclination angle reference value acquisition means newly acquires the inclination angle reference value acquired last time. And a midpoint correction means for updating to a value, wherein the tilt angle detected by the tilt angle sensor is corrected by the tilt angle reference value updated by the midpoint correction means.

  According to the first and second aspects of the invention, since the midpoint correction is performed when the oil supply detection means detects that the oil is being supplied, the inclination angle with high accuracy that the inclination angle is 0 is high. Since the reference value is acquired and the midpoint correction can be performed, a change in the tilt angle reference value due to a change over time or the like can be appropriately corrected, and a more accurate tilt angle can be displayed.

  According to the present invention, it is possible to provide a midpoint correction method of a tilt angle sensor and a vehicle tilt angle display device capable of correcting the midpoint with a simple configuration.

It is a block diagram which shows the function structure of the inclination-angle display apparatus of the vehicle which concerns on this embodiment. It is an example of the inclination angle display part of an inclination angle display apparatus. It is a flowchart which shows the flow of control of the midpoint correction method. Explanatory drawing of the inclination-angle display apparatus using the mechanical level which also served as the conventional inclination-angle sensor.

  Hereinafter, a vehicle tilt angle display device according to an embodiment of the present invention will be described in detail with reference to the drawings.

A vehicle tilt angle display device according to this embodiment will be described with reference to FIG.
FIG. 1 is a block diagram showing a functional configuration of a vehicle tilt angle display device according to the present embodiment.

<< Overview of tilt angle display device >>
The tilt angle display device 1 according to the present embodiment includes a longitudinal acceleration sensor Sα _X that is a tilt angle sensor that detects a tilt angle in the front-rear direction of the vehicle, and a tilt angle sensor that detects a tilt angle in the vehicle width direction (lateral direction) of the vehicle. A lateral acceleration sensor Sα _Y , a yaw rate sensor Sγ that detects a turning rate (yaw rate) of the vehicle, a vehicle speed acquisition unit 3 that acquires a vehicle speed VS that is the speed of the vehicle, a stop state acquisition unit 4 that detects a stop state of the vehicle, Inclination angle calculation ECU (Electric Control Unit) 5 for subtracting the component due to the acceleration of the signals from the longitudinal acceleration sensor Sα _X and the lateral acceleration sensor Sα _Y , correcting with the inclination angle reference value, and correcting the midpoint, An inclination angle display unit 7 for displaying the inclination angle corrected by the inclination angle calculation ECU 5, and a filler switch 9 provided in the hinge part of the filler lid of the fuel tank of the vehicle (in FIG. 1, “ It displays an oil port SW9 'is configured to include the following referred to as "filler opening SW9').
The oil supply port SW9 corresponds to “oil supply detection means” described in the claims.

<Inclination angle sensor>
The longitudinal acceleration sensor Sα _X and the lateral acceleration sensor Sα _Y as tilt angle sensors in this embodiment are a capacitance type acceleration sensor, a metal strain gauge type acceleration sensor, a semiconductor strain gauge type acceleration sensor, a piezoelectric acceleration sensor, a MEMS ( Any of a semiconductor acceleration sensor using a Micro Electro Mechanical Systems) technology, for example, a capacitive acceleration sensor may be used.
By the way, metal strain gauge type acceleration sensors, semiconductor strain gauge type acceleration sensors, piezoelectric type acceleration sensors, etc. have a cantilever shape with inertial mass at the tip of the beam, and detect the amount of deflection of the beam with a strain gauge or piezoelectric element. To do. In addition, the capacitance type acceleration sensor among the semiconductor acceleration sensors using the MEMS technology detects the variation in the distance between the beams as the capacitance value by regarding the two beams as the electrode plates of the capacitors. is there.

《Vehicle speed acquisition means》
Next, the vehicle speed acquisition means 3 will be described. Recent vehicle brake systems are equipped with ABS (Anti-lock Brake System), which obtains wheel speeds from wheel speed sensors provided on each wheel, and brake control ECU or VSA (Vehicle Stability Assist) control ECU. In many cases, the vehicle speed VS, which is the speed of the vehicle, is calculated. Then, a signal of the vehicle speed VS is output from the brake control ECU or the VSA control ECU to another control ECU via a communication line. Here, as the vehicle speed acquisition means 3, a wheel speed sensor corresponds to a functional unit for calculating the vehicle speed of the brake control ECU or the VSA control ECU, and a signal of the vehicle speed VS is calculated as an inclination angle via the communication line described above. Input to the ECU 5.

<< Stop state acquisition means >>
The stop state acquisition means 4 is, for example, an ignition switch (shown as “IG-SW” in FIG. 3), a parking position detection function in a select position sensor that detects a set position of the select lever, and a side brake. It is comprised from the side brake SW etc. which detect this.

<< Inclination angle calculation ECU >>
The inclination angle calculation ECU 5 is a CPU, ROM, RAM, I / O, a rewritable nonvolatile memory, for example, a microcomputer including a flash memory, an input / output interface circuit, and a drive circuit for an inclination angle display section 7 to be described later. It is comprised from the drive parts 18A and 18B mentioned later, the power switch circuit etc. which can cut | disconnect the power supply of inclination-angle calculation ECU5 by control of CPU. In the ROM, an inclination angle calculation program is stored in advance, and the CPU 11 executes the above-described inclination angle calculation program, so that the filters 11A and 11B, the acceleration calculation unit 12, and the longitudinal inclination angle calculation that are the functional units illustrated in FIG. The following functions are implemented by the unit 13, the lateral inclination angle calculation unit 14, the correction calculation units 15 and 16, the midpoint correction control unit 17, and the drive units 18A and 18B. Each functional unit executes processing at a constant cycle.
Here, the acceleration calculation unit 12, the front / rear inclination angle calculation unit 13, the lateral inclination angle calculation unit 14, and the correction calculation units 15 and 16 constitute a “calculation processing unit” described in the claims.

The filters 11A and 11B filter the signals of the longitudinal acceleration sensor Sα _X and the lateral acceleration sensor Sα _Y , respectively, and output the filtered signals to the longitudinal tilt angle calculation unit 13 and the lateral tilt angle calculation unit 14, respectively.
The acceleration calculation unit 12 reads the vehicle speed VS at a constant period, and calculates a true longitudinal acceleration from a change in the vehicle speed VS.
The longitudinal inclination angle calculating unit 13 includes the longitudinal acceleration α _X and the longitudinal acceleration component of the vehicle in the filtered longitudinal acceleration α _X , so that the longitudinal acceleration α is expressed by the following equation (1). _The true longitudinal acceleration calculated by the acceleration calculating unit 12 is subtracted from _X to calculate the forward / backward tilt angle, which is output to the correction calculating unit 15.
(Longitudinal inclination angle) = sin ⁻¹ {(filtered longitudinal acceleration α _X ) − (true longitudinal acceleration)} (1)

The lateral inclination angle calculation unit 14 includes a lateral acceleration angle component of the vehicle and a lateral acceleration component in the filtered lateral acceleration α _Y , and therefore, as shown in the following equation (2), the lateral acceleration α _The true lateral acceleration calculated by the product of the yaw rate γ and the vehicle speed VS is subtracted from _Y to calculate the lateral inclination angle and output it to the correction calculation unit 16.
(Lateral inclination angle) = sin ⁻¹ {(filtered lateral acceleration α _Y ) − (vehicle speed VS) × (yaw rate γ)} (2)

The correction calculation unit 15 is driven by correcting the front / rear tilt angle output by the front / rear tilt angle calculation unit 13 based on the front / rear tilt angle reference value stored in the front / rear tilt angle reference value storage unit 15a of the rewritable nonvolatile memory. To the unit 18A. The drive unit 18A, which is a part of the drive circuit of the tilt angle display unit 7, causes the tilt angle display unit 7 to display the front / rear tilt angle corrected with the front / rear tilt angle reference value.
Similarly, the correction calculation unit 16 corrects the lateral tilt angle output by the lateral tilt angle calculation unit 14 based on the lateral tilt angle reference value stored in the lateral tilt angle reference value storage unit 16a of the rewritable nonvolatile memory. And output to the drive unit 18B. The drive unit 18B, which is a part of the drive circuit of the tilt angle display unit 7, causes the tilt angle display unit 7 to display the horizontal tilt angle corrected with the horizontal tilt angle reference value.

When the stop state acquisition means 4 detects the stop of the vehicle, the midpoint correction control unit 17 further detects that the fuel filler lid is opened and the fuel filler SW9 is turned on (ON). , It is determined that the vehicle has stopped at the gas station for refueling, midpoint correction control is performed, new front and rear tilt angle reference values and lateral tilt angle reference values are obtained, and the respective front and rear tilt angle reference values are stored. Unit 15a and the horizontal inclination angle reference value storage unit 16a, and updated to new front and rear inclination angle reference values and horizontal inclination angle reference values. As a result, thereafter, the correction calculation units 15 and 16 can perform correction calculation using the newly updated front and rear tilt angle reference value and lateral tilt angle reference value.
A method of acquiring and updating a new front / rear tilt angle reference value and lateral tilt angle reference value, that is, a midpoint correction method in the midpoint correction control unit 17, will be described in the description of the flowchart shown in FIG.

<Inclination angle display>
Next, the configuration of the tilt angle display unit 7 will be described with reference to FIG. FIG. 2 is an example of the tilt angle display unit of the tilt angle display device. The inclination angle display unit 7 uses, for example, an organic EL panel, and the inclination angle included in the inclination angle calculation ECU 5 is displayed on the display panel 20 in terms of both the front and rear inclination angles and the horizontal inclination angle in a digital value and scale display. The display is controlled by the drive units 18A and 18B constituting the display control drive circuit of the display unit 7.

On the slightly right side of the center of the display panel 20, a horizontal base line 22 that is divided into two extending in the vehicle width direction substantially at the center in the vertical direction of the display panel 20, and a horizontal inclination angle display of a circular display at the center of the two horizontal base lines 22. A light emitting unit 25 is provided, and a straight line 25a inclined with respect to the horizontal base line 22 so as to correspond to the horizontal inclination angle emits light. Then, a horizontal inclination angle scale 23 is displayed around the horizontal base line 22 on both the left and right sides of the horizontal inclination angle display light emitting unit 25 around the front and rear. With such a display, it is possible to visually and intuitively read how much the vehicle is inclined in the lateral direction (left and right direction) with respect to the actual horizontal. This is the same as the horizon display technology in aviation technology, and is known as man-machine interface technology.
In addition, the horizontal tilt angle digital display unit 33 disposed substantially below the center of the display panel 20 can display the horizontal tilt angle even with digital values with positive and negative signs.
Here, the display of the digital value of the horizontal inclination angle in the horizontal inclination angle digital display section 33 indicates that the inclination angle in the state where the vehicle is inclined to the left side (the left side is lower than the right side) is “left”. Displayed, the tilt angle is displayed behind it, and the tilt angle when the vehicle is tilted to the right side (the right side is tilted lower than the left side) is displayed as “right” and behind it. Displays the tilt angle.

On the left side of the display panel 20, specifically, on the left side of the horizontal base line 22 on the left side, a scale 27 indicating the front / rear tilt angle is displayed, and on the right side thereof, the front / rear tilt angle display light emitting unit 28 corresponding to the scale 27 is displayed. The area 28 is set, and the indicator 28a indicating the position indicating the front / rear tilt angle emits light. In addition, the front / rear inclination angle digital display unit 31 arranged on the lower left side of the display panel 20 can display the front / rear inclination angle even with a digital value with a positive / negative sign.
Here, the front-rear inclination angle is displayed as positive (+) for the front high state of the vehicle and negative (-) for the front low state.

(Midpoint correction method)
Next, with reference to FIG. 1 as appropriate with reference to FIG. 3, a midpoint correction method in the tilt angle display device 1 of the present embodiment will be described. FIG. 3 is a flowchart showing a control flow of the midpoint correction method.
This control is mainly performed by the midpoint correction control unit 17.

In step S01, the midpoint correction control unit 17 determines whether or not the stop state acquisition unit 4 has detected that the vehicle has stopped, that is, whether or not the vehicle has stopped. Here, stopping the vehicle not only indicates that the vehicle speed VS is zero, but also obtains a stop state in order to reliably determine whether the vehicle has stopped before the gas station (gas station) fueling device. When the means 4 detects that the select lever is put in the parking position or the side brake is pulled, it is determined that the midpoint correction control unit 17 has detected that the vehicle has stopped. .
When the stop of the vehicle is detected (Yes), the process proceeds to Step S02, and when the stop of the vehicle is not detected (No), Step S01 is repeated.

In step S02, it is determined whether or not the stop state acquisition unit 4 has detected that the IG-SW is turned off. If IG-SW off (OFF) is detected (Yes), the process proceeds to step S03. If IG-SW off (OFF) is not detected (No), step S02 is repeated.
In step S03, a timer t using the above-described clocking function built in the microcomputer is started. Next, in step S04, it is determined whether or not the fuel filler lid has been opened, that is, whether or not the fuel filler SW9 has been turned on. If the fuel filler port SW9 is turned on (Yes), the process proceeds to step S05. If the fuel filler port SW9 remains off (OFF) (No), the process proceeds to step S13.

  In step S05, a midpoint correction instruction is output to the drive units 18A and 18B. In step S06, the drive units 18A and 18B cause the tilt angle display unit 7 to output a display during midpoint correction. As the display output during the midpoint correction, for example, the front / rear tilt angle digital display unit 31 and the horizontal tilt angle digital display unit 33 are blinked or characters such as “midpoint correction is in progress” are displayed. Notify the occupant that the dots are being displayed. At this time, the display of the straight line 25a indicating the horizontal inclination angle and the display of the index 28a indicating the front-back inclination are stopped.

In step S07, an average value of a predetermined number N of the front and rear inclination angles and the lateral inclination angles is used as the inclination angle reference values of the front and rear inclination angles and the lateral inclination angles, so that n = 0 is set as an initial reset of the count. To do.
In step S08, the front and rear inclination angles calculated by the filter 11A and calculated by the front and rear inclination angle calculation unit 13 and the horizontal inclination angles calculated by the filter 11B and calculated by the horizontal inclination angle calculation unit 14 are temporarily stored. Is stored in the memory. In step S09, the count is incremented to n = n + 1.

In step S10, it is determined whether n is a predetermined number N or more (“n ≧ N?”). If n is greater than or equal to the predetermined number N (Yes), the process proceeds to step S11. If n is less than the predetermined number N (No), steps S08 and S09 are repeated.
In step S11, the temporarily stored N average values of the front and rear inclination angles and the lateral inclination angles are calculated and stored in the nonvolatile memory as respective inclination angle reference values. Specifically, the average value of the front and rear inclination angles is stored in the front and rear inclination angle reference value storage unit 15a, and the average value of the horizontal inclination angles is stored in the horizontal inclination angle reference value storage unit 16a. Updated. After step S11, the process proceeds to step S12.
In step S12, an off signal is output to the power switch circuit described above, and the tilt angle calculation ECU 5 is stopped.

  If No in step S04 and the process proceeds to step S13, it is determined whether or not the timer t is equal to or longer than a predetermined time limit T. When the timer t is equal to or longer than the predetermined time limit T (Yes), the process proceeds to step S12, and the tilt angle calculation ECU 5 is stopped. If the timer t is less than the predetermined time limit T (No), step S04 is repeated.

  That is, even if the IG-SW is turned off, the inclination angle calculation ECU 5 determines that a certain period of time has elapsed or the vehicle has stopped at the gas station and the fuel filler opening has been opened. Until the correction is completed, the control is such that the on-power state continues for a while.

  Steps S01, S02, and S04 in the flowchart of the present embodiment constitute “oil supply detection means” described in the claims, and steps S07 to S10 include “inclination angle reference value acquisition means” described in the claims. Step S11 constitutes “middle point correcting means” described in the claims.

According to this embodiment described above, when the fuel is supplied to the vehicle at the gas station, the reference angle values of the front and rear inclination angles and the lateral inclination angle are automatically updated accurately.
Incidentally, the predetermined stop position of the gas station in front of the fueling device is usually designed to stop the vehicle horizontally in the front-rear and left-right directions so that the fuel tank can be fully filled.
Therefore, even when the longitudinal acceleration sensor Sα _X and the lateral acceleration sensor Sα _{Y that} are the inclination angle sensors change the inclination angle reference value due to a change with time, the inclination angle 0 (zero) is automatically and reliably reliable every time fueling is performed. It is possible to correct the midpoint by acquiring the reference value of the tilt angle in this state.

  Further, in order to obtain a tilt angle reference value in a state of a highly reliable tilt angle of 0 (zero), a predetermined number N of front and rear tilt angles and lateral tilt angles are obtained, and the average values are obtained as respective tilt angle references. Since the value is set, it is possible to cancel an error caused by a vehicle shake caused by a passenger getting off at the time of refueling, and to perform highly reliable midpoint correction.

In addition, as the “oil supply detection means” described in the claims, not only the ON of the fuel supply port SW9 but also the OFF of the IG-SW in the flowchart (step S02) and the parking position detection of the select lever (step S01). The reason for this is that in the case of refueling, it is common to stop the engine, and at least before the engine stops, it is common to set the select lever to the parking position.
In addition, it is possible to determine that it is during refueling by detecting an increase of a certain amount or more of the amount of fuel in the fuel tank as the “oil refueling detection means” described in the claims.

  According to the present embodiment, it is possible to provide a midpoint correction method of a tilt angle sensor and a vehicle tilt angle display device that can correct the midpoint with a simple configuration.

DESCRIPTION OF SYMBOLS 1 Inclination angle display device 3 Vehicle speed acquisition means 4 Stop state acquisition means 5 Inclination angle calculation ECU
7 Inclination angle display 9 Refueling port SW (Refueling detection means)
11A, 11B filter 12 acceleration calculation unit (arithmetic processing unit)
13 Front / rear inclination angle calculation unit (calculation processing unit)
14 Lateral tilt angle calculation unit (calculation processing unit)
15, 16 Correction calculation unit (calculation processing unit)
15a Front / Rear Inclination Angle Reference Value Storage Unit 16a Lateral Inclination Angle Reference Value Storage Unit 17 Midpoint Correction Control Unit 18A, 18B Drive Unit 20 Display Panel 22 Horizontal Base Line 23 Horizontal Inclination Angle Scale 25 Lateral Inclination Angle Display Light Emitting Unit 27 Front / Rear Inclination Angle Scale 28 Front / rear tilt angle display light emitting unit 31 Front / rear tilt angle digital display unit 33 Lateral tilt angle digital display unit Sα _X Longitudinal acceleration sensor (tilt angle sensor)
Sα _Y lateral acceleration sensor (tilt angle sensor)
Sγ Yaw Rate Sensor

Claims (2)

In a midpoint correction method of an inclination angle sensor that is provided in a vehicle and detects an inclination angle of a road surface in contact with the vehicle,
When the oil supply detecting means for detecting that the oil is being supplied detects that the oil is being supplied, an inclination angle reference value having an inclination angle of 0 is acquired.
A midpoint correction method for an inclination angle sensor, wherein the inclination reference value acquired last time is updated. An inclination angle sensor provided on the vehicle for detecting the inclination angle of the road surface in contact with the vehicle, an arithmetic processing unit for calculating the inclination angle based on a signal from the inclination angle sensor, and a corrected inclination angle are displayed. An inclination angle display device for a vehicle, comprising:
It is equipped with a lubrication detection means that detects when it is refueling,
The arithmetic processing unit includes:
An inclination angle reference value acquisition means for acquiring an inclination reference value having an inclination angle of 0 when the oil supply detection means detects that it is during fueling;
Midpoint correction means for updating the inclination angle reference value acquired last time to the inclination reference value newly acquired by the inclination angle reference value acquisition means, and
An inclination angle display device for a vehicle, wherein the inclination angle detected by the inclination angle sensor is corrected by an inclination angle reference value updated by the midpoint correction means.

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