WO2013168285A1

WO2013168285A1 - Pressure sensor failure diagnosis device and pressure sensor failure diagnosis method

Info

Publication number: WO2013168285A1
Application number: PCT/JP2012/062170
Authority: WO
Inventors: 直樹生田; 政一千葉
Original assignee: トヨタ自動車株式会社
Priority date: 2012-05-11
Filing date: 2012-05-11
Publication date: 2013-11-14

Abstract

The present invention addresses the problem of providing a pressure sensor failure diagnosis device and a pressure sensor failure diagnosis method, which are capable of accurately performing a failure diagnosis of a pressure sensor at low cost. The present invention relates to a failure diagnosis of a vehicle-mounted pressure sensor (particularly, a pressure sensor for collision detection is preferable), and is characterized by outputting sound for the failure diagnosis when an ignition is turned on, comparing a detection waveform detected by the pressure sensor in response to the outputted sound and a reference waveform preset for the sound for the failure diagnosis, and diagnosing the failure of the pressure sensor.

Description

Failure diagnosis device for pressure sensor and failure diagnosis method for pressure sensor

The present invention relates to a failure diagnosis device and failure diagnosis method for an on-vehicle pressure sensor.

¡Airbag devices that deal with side collisions have been put into practical use, and pressure sensors are used to detect side collisions. The pressure sensor is disposed in each of the left and right doors of the vehicle, and detects the pressure received when an object collides with the side surface of the vehicle. It is important for such a pressure sensor to operate normally when a side collision actually occurs, and it is desirable to perform failure diagnosis on the pressure sensor in advance. In Patent Document 1, as a method for inspecting the functionality of a pressure sensor that detects the atmospheric pressure in a vehicle body portion of a vehicle, a measured value of a pressure sensor to be inspected and a measured value of at least one other pressure sensor are determined in advance. Disclosed is to identify a pressure sensor as faulty when compared to each other over an observation time and when the pressure sensor measurement value differs from a measurement value of at least one other pressure sensor by more than a predetermined degree. Yes.

JP 2005-520149 A JP 2007-83846 A Japanese Patent Laid-Open No. 2007-232565

In the case of the method disclosed in Patent Document 1 described above, an additional pressure sensor is required for failure diagnosis, which increases costs. Further, when there is an abnormality in the additional pressure sensor, normal inspection cannot be performed on the pressure sensor to be inspected.

Therefore, an object of the present invention is to provide a pressure sensor failure diagnosis device and a pressure sensor failure diagnosis method that can accurately perform pressure sensor failure diagnosis at low cost.

A pressure sensor failure diagnosis device according to the present invention is a vehicle-mounted pressure sensor failure diagnosis device, a sound output unit that outputs a preset sound, and a pressure sensor according to the sound output from the sound output unit And a failure diagnosing unit for diagnosing a failure of the pressure sensor by comparing the detected waveform detected in step 1 with a preset reference waveform for the sound output from the sound output unit.

This fault diagnosis device outputs a preset sound from the sound output unit. A reference waveform for determining failure of the pressure sensor is set in advance according to the sound output from the sound output unit. That is, a preset sound is output in advance, air vibration caused by the sound is detected by a normal pressure sensor, and a reference waveform is set based on the detected waveform. When a preset sound is output from the sound output unit, the failure diagnosis unit compares the detected waveform detected by the pressure sensor with the reference waveform according to the output sound by the failure diagnosis unit, and the detected waveform is It is determined whether or not the pressure sensor has failed depending on whether or not the reference waveform is deviated. In this fault diagnosis device, a preset sound is intentionally output, and the fault is diagnosed by detecting the sound with the pressure sensor, so that the fault diagnosis of the pressure sensor can be accurately performed at low cost.

In the pressure sensor failure diagnosis apparatus of the present invention, it is preferable that the sound output from the sound output unit is a sound set in advance as a sound for failure diagnosis of the pressure sensor.

This fault diagnosis device outputs a sound for fault diagnosis from the sound output unit. As the sound for failure diagnosis, a sound having a predetermined frequency or level different from the sound that may be generated around the pressure sensor is set in advance. A reference waveform for determining a failure of the pressure sensor is set in advance according to the sound for failure diagnosis. When a failure diagnosis sound is output, the failure diagnosis unit compares the detected waveform detected by the pressure sensor with the reference waveform in accordance with the failure diagnosis unit by the failure diagnosis unit, and detects the detected waveform from the reference waveform. It is determined whether or not the pressure sensor has failed depending on whether or not it is disconnected. In this failure diagnosis device, failure diagnosis of the pressure sensor can be accurately performed at low cost by intentionally outputting a failure diagnosis sound and detecting the failure diagnosis sound with the pressure sensor. .

In the pressure sensor failure diagnosis apparatus of the present invention, it is preferable that the sound output unit outputs a preset sound when the ignition is ON. The vehicle starts running after the ignition is turned on, and the detected value is used for the on-board pressure sensor while the vehicle is running. Therefore, in this failure diagnosis device, it is possible to perform failure diagnosis of the pressure sensor before the vehicle starts running by outputting a preset sound when the ignition is turned on, and the failure pressure sensor is used while the vehicle is running. Can be prevented as much as possible.

In the pressure sensor failure diagnosis device of the present invention, the sound output from the sound output unit may be a sound from the sound output unit of the in-vehicle alarm device.

This failure diagnosis device outputs sound from the sound output unit of an alarm device mounted on the vehicle. A reference waveform for determining failure of the pressure sensor is set in advance according to the sound output from the sound output unit of the alarm device. When sound is output from the sound output unit of the alarm device, the failure diagnosis unit compares the detected waveform detected by the pressure sensor with the reference waveform according to the output sound, and the detected waveform is the reference. It is determined whether or not the pressure sensor has failed depending on whether or not the waveform deviates. In this failure diagnosis device, the sound output from the alarm device mounted on the vehicle is utilized, and the sound is detected by the pressure sensor to diagnose the failure, thereby making it possible to accurately diagnose the failure of the pressure sensor at a low cost. . In this case, it is not necessary to prepare a special sound for failure diagnosis, and the sound output unit can use the alarm device.

In the pressure sensor failure diagnosis apparatus of the present invention, the failure diagnosis unit outputs from the sound output unit a detection waveform that is a time-series change of the detection value detected by the pressure sensor in accordance with the sound output from the sound output unit. A reference waveform preset as a time-series change of a reference output value for a sound to be played, and at a time corresponding to an arbitrary time in the reference waveform and the height of the waveform at an arbitrary time in the detected waveform When the difference from the height of the waveform does not fall within a preset range, it is determined that the pressure sensor has failed. By performing the determination in this way, it can be easily and accurately determined whether or not the detected waveform deviates from the reference waveform. The corresponding time is a time obtained by elapse of the time required from the rise (start) time of the detected waveform to an arbitrary time from the rise (start) time of the reference waveform.

In the pressure sensor failure diagnosis apparatus of the present invention, it is preferable that the pressure sensor is a pressure sensor for collision detection. In the case of a pressure sensor for collision detection, there is a possibility that a failure will not be noticed until the vehicle actually collides. However, in this failure diagnosis device, the failure diagnosis of the pressure sensor can be performed by intentionally outputting a failure diagnosis sound. Therefore, even in the case of a collision detection pressure sensor, the failure can be noticed in advance.

A failure diagnosis method for a pressure sensor according to the present invention is a failure diagnosis method for a vehicle-mounted pressure sensor, a sound output step for outputting a preset sound, and a pressure sensor according to the sound output in the sound output step And a failure diagnosis step of diagnosing a failure of the pressure sensor by comparing the detected waveform detected in step 1 with a reference waveform preset for the sound output in the sound output step.

In the pressure sensor failure diagnosis method of the present invention, it is preferable that the sound output in the sound output process is a sound preset as a sound for failure diagnosis of the pressure sensor. Furthermore, in the pressure sensor failure diagnosis method of the present invention, it is preferable that the sound output step outputs a preset sound when the ignition is ON. In the pressure sensor failure diagnosis method of the present invention, the sound output in the sound output step may be a sound from a sound output unit of an in-vehicle alarm device.

In the pressure sensor failure diagnosis method of the present invention, the failure diagnosis step outputs a detection waveform and a sound output step, which are time-series changes of detection values detected by the pressure sensor in accordance with the sound output in the sound output step. A reference waveform preset as a time-series change of a reference output value for a sound to be played, and at a time corresponding to an arbitrary time in the reference waveform and the height of the waveform at an arbitrary time in the detected waveform When the difference from the height of the waveform does not fall within a preset range, it is determined that the pressure sensor has failed. In the pressure sensor failure diagnosis method of the present invention, it is preferable that the pressure sensor is a collision detection pressure sensor.

Each failure diagnosis method operates in the same manner as each failure diagnosis device described above and has the same effect.

According to the present invention, it is possible to accurately diagnose a failure of the pressure sensor at low cost by intentionally outputting a preset sound and detecting the sound with the pressure sensor to diagnose the failure.

It is a block diagram of the airbag apparatus (especially failure diagnosis of a pressure sensor) which concerns on this Embodiment. It is explanatory drawing of the failure diagnosis method of the pressure sensor which concerns on this Embodiment, (a) is a case where a pressure sensor is normal, (b) is a case where a pressure sensor is failure. It is an example of the detection waveform and corridor of the pressure sensor with respect to the sound for fault diagnosis. It is a flowchart which shows the flow of operation | movement of the fault diagnosis of the pressure sensor in the airbag apparatus which concerns on this Embodiment.

Embodiments of a pressure sensor failure diagnosis apparatus and failure diagnosis method according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the element which is the same or it corresponds in each figure, and the overlapping description is abbreviate | omitted.

In the present embodiment, the present invention is applied to an airbag device mounted on a vehicle. The airbag apparatus according to the present embodiment includes a pressure sensor for detecting a side collision in addition to the G sensor in order to detect a collision. In the present embodiment, failure diagnosis of a pressure sensor for detecting a side collision of an airbag device will be described in detail. In this failure diagnosis, in addition to the failure (abnormality) of the pressure sensor itself, an abnormality in the peripheral part related to the pressure sensor (for example, disconnection of the signal line connected to the pressure sensor, failure of the door where the pressure sensor is installed) ) Can also be diagnosed.

With reference to FIGS. 1 to 3, the airbag apparatus 1 (particularly, failure diagnosis of the pressure sensor) according to the present embodiment will be described. FIG. 1 is a configuration diagram of an airbag device (particularly, failure diagnosis of a pressure sensor) according to the present embodiment. FIG. 2 is an explanatory diagram of the failure diagnosis method for the pressure sensor according to the present embodiment. FIG. 3 is an example of a detection waveform of a pressure sensor and a corridor for a failure diagnosis sound.

The airbag device 1 performs failure diagnosis of all pressure sensors for side collision detection when the ignition is ON. For this purpose, the airbag device 1 intentionally outputs a failure diagnosis sound from the speaker, and a reference set in advance for the detection waveform detected by the pressure sensor and the failure diagnosis sound according to the sound. The waveform (corridor) is compared to determine whether or not the pressure sensor has failed. And the airbag apparatus 1 lights a warning lamp, when it determines with a pressure sensor having failed.

The airbag device 1 includes a speaker 10, a pressure sensor 11, an ignition switch 12, a warning light 20, and an ECU [Electronic Control Unit] 30 (sound output control unit 31, failure diagnosis unit 32) as related to pressure sensor failure diagnosis. I have.

In the present embodiment, the pressure sensor 11 corresponds to the pressure sensor described in the claims, the speaker 10 and the sound output control unit 31 correspond to the sound output unit described in the claims, and the failure diagnosis unit 32. Corresponds to the failure diagnosis unit described in the claims.

The speaker 10 is an in-vehicle speaker that is shared by various devices of the vehicle. When the speaker 10 receives the sound output control signal from the airbag ECU 30, the speaker 10 outputs a sound according to the sound output control signal.

The pressure sensor 11 is a pressure sensor for detecting a side collision. There are a plurality of pressure sensors 11, which are arranged inside the left and right doors. In the case of a four-door vehicle, it may be provided on both the front door and the rear door, or may be provided on either one. The pressure sensor 11 is configured by a piezoelectric element (piezo element) that generates a voltage according to a force caused by pressure, vibration, or the like. In each pressure sensor 11, the voltage converted according to the applied force is transmitted to the airbag ECU 30 as a detection signal at regular time intervals. Note that the pressure sensor 11 is provided with an air inlet for detecting pressure, and the pressure cannot be detected when the air inlet is closed with dust or the like.

The ignition switch 12 is a switch for starting / stopping the engine, and is a switch for selecting any of OFF, accessory ON, ignition ON, and engine start modes. The ignition switch 12 transmits the selected switch information to the airbag ECU 30 as an ignition signal.

The warning light 20 is a warning light for notifying the abnormality of the airbag device 1, and may be a dedicated warning light for notifying a failure (abnormality) of the pressure sensor 11. The warning light 20 is provided in a combination meter or the like. The warning light 20 is turned on when a warning light lighting signal is received from the airbag ECU 30. When the warning lamp 20 is provided in the combination meter, the meter ECU receives a warning lamp lighting signal, and the meter ECU turns on the warning lamp 20.

The airbag ECU 30 is an electronic control unit composed of a CPU [Central Processing Unit], ROM [Read Only Memory], RAM [Random Access Memory], and the like, and comprehensively controls the airbag device 1. The airbag ECU 30 performs a failure diagnosis process for the pressure sensor in addition to processes such as collision determination and inflator control. Here, the failure diagnosis process of the pressure sensor in the airbag ECU 30 will be described. The airbag ECU 30 includes a sound output control unit 31 and a failure diagnosis unit 32 in order to perform failure diagnosis processing of the pressure sensor.

The sound output control unit 31 determines whether or not the ignition is turned on based on the ignition signal from the ignition switch 12. When the ignition is turned on, the sound output control unit 31 transmits a sound output control signal to the speaker 10 in order to output a sound for failure diagnosis.

Failure diagnosis sounds are routinely used inside and outside the vehicle so that other sounds do not reduce the accuracy of the failure diagnosis during the failure diagnosis (for example, sound of human conversation, radio sound, in-vehicle audio (Sound, engine sound) The frequency and level of the sound is as different as possible (sounds of completely different frequency and level are desirable). The sound level is set to a level that sufficiently reaches the pressure sensor 11 provided in each door. The frequency and level of the sound are within the output specification range of the speaker 10. Based on such conditions, at the vehicle development stage, the frequency of sound for failure diagnosis, the peak value of the level, the change pattern of the sound level (for example, triangular wave, trapezoidal wave) and the like are set in advance. The sound output control signal from the sound output control unit 31 is an electric signal for outputting the sound having the preset change frequency and level of sound.

Furthermore, when the sound for failure diagnosis is set at the vehicle development stage, a corridor indicating the range of the reference waveform for failure diagnosis is set in advance. Specifically, in an actual vehicle experiment, a sound for failure diagnosis is output from a speaker, the sound is detected by a normal pressure sensor, and a detection waveform by the pressure sensor is obtained. The detected waveform may be time series data of a raw output value (voltage value) from the pressure sensor, or may be time series data of a pressure value (for example, Pascal) converted from the voltage value. Then, in consideration of manufacturing variation of the pressure sensor, noise at the time of detection of the pressure sensor, manufacturing variation of the speaker, etc., a corridor having an allowable range up and down is set with reference to the detected waveform. The upper and lower permissible ranges may be constant in all regions, or may be different in each region (for example, the region around the peak is wider than other regions, the rising region is another region) Wider tolerance). FIG. 2 shows an example of the corridor C1, and in the case of the corridor C1, the allowable range is constant in the entire area.

In the failure diagnosis unit 32, when a sound for failure diagnosis is output from the speaker 10 by the sound output control unit 31, a detection waveform is generated for each pressure sensor 11 based on a detection signal from the pressure sensor 11 at regular intervals. obtain. The detected waveform is time-series data of the raw voltage value from the pressure sensor 11 when the corridor is a voltage value, and is time-series data of the pressure value converted from the voltage value when the corridor is a pressure value.

The failure diagnosis unit 32 compares the detection waveform with the corridor by matching the rise (start) of the detection waveform with the rise (start) of the corridor for each pressure sensor 11, and determines whether or not the pressure sensor 11 is out of order. judge. In this comparison, for each elapsed time from the rise time in the detected waveform, the corridor at the time when the height of the waveform of the detected waveform at each elapsed time (that is, the output of the pressure sensor) corresponds to each elapsed time. It is determined whether it is within the allowable range above and below. In this failure determination, various determination conditions can be applied. Considering the allowable range in the corridor, the detection characteristics of the pressure sensor 11, and the like, for example, whether the detection waveform is included in the entire corridor or not. Whether it is in a part of the corridor (for example, the area around the peak or the rising area), and whether the detected waveform is in the corridor at a predetermined ratio or more (for example, 70% or more, 50% or more). There is a judgment condition. If the failure diagnosis unit 32 determines that at least one pressure sensor 11 has failed, it transmits a warning lamp lighting signal.

FIG. 2 shows an example of the determination method, which is a determination condition whether or not the detection waveform of the pressure sensor 11 is included in the entire corridor C1. In FIG. 2, the horizontal axis represents time, the vertical axis represents the output of the pressure sensor (for example, the pressure value), and the origin is the moment when a sound for failure diagnosis is output from the speaker. As shown in FIG. 2A, when the detection waveform D1 of the pressure sensor 11 is included in the entire corridor C1, it is determined that the pressure sensor 11 is normal. As shown in FIG. 2B, when there is a portion where the detection waveform D2 of the pressure sensor 11 does not enter the corridor C1, it is determined that the pressure sensor 11 is out of order.

FIG. 3 shows a case where a sound for failure diagnosis is output from the speaker 10 and a detection waveform D3 of the pressure sensor 11 is obtained for the sound in an actual vehicle. The corridor C3 changes more rapidly than the falling edge, and the area around the peak has a wider allowable range than other areas. In this case, since the detection waveform D3 has entered the entire area of the corridor C3, it is determined that the pressure sensor 11 is normal. Incidentally, since the actual output of the pressure sensor 11 fluctuates as indicated by the detection waveform D3, it is determined by a corridor provided with an allowable range.

Referring to FIG. 1, the flow of operation of fault diagnosis of the pressure sensor 11 in the airbag device 1 will be described along the flowchart of FIG. FIG. 4 is a flowchart showing the flow of operation of fault diagnosis of the pressure sensor in the airbag apparatus according to the present embodiment.

If the airbag ECU 30 determines that the ignition is ON based on the ignition signal from the ignition switch 12 (S1), the airbag ECU 30 starts transmitting a sound output control signal for failure diagnosis to the speaker 10 (S2). The airbag ECU 30 transmits a sound output control signal according to the change pattern until the sound change pattern for failure diagnosis is completed (S2).

The speaker 10 outputs a sound for failure diagnosis according to the sound output control signal while receiving the sound output control signal (S2). At this time, each pressure sensor 11 detects a force caused by air vibration of the sound at regular intervals, and transmits a detection signal to the airbag ECU 30 (S3).

The airbag ECU 30 receives detection signals from the pressure sensors 11 at regular intervals. Then, the airbag ECU 30 obtains a detection waveform for the sound for failure diagnosis for all the pressure sensors 11. The airbag ECU 30 determines for each pressure sensor 11 whether the detected waveform is within the corridor (S4). When it is determined in S4 that the detected waveform is in the corridor, the airbag ECU 30 determines that the pressure sensor 11 is normal (S5). If it is determined in S4 that the detected waveform is outside the corridor, the airbag ECU 30 determines that the pressure sensor 11 is out of order (S6) and transmits a warning lamp lighting signal (S7).

When the warning light lighting signal is received, the warning light 20 is turned on. The user notices that there is a failure in the pressure sensor 11 by turning on the warning light 20, and takes measures such as bringing the vehicle into a dealer or a repair shop.

According to the airbag device 1 (particularly, failure diagnosis of the pressure sensor), by deliberately outputting a failure diagnosis sound from the speaker 10 and detecting the sound with the pressure sensor 11 to diagnose the failure, The cost is low (it is not necessary to add another sensor or the like for failure diagnosis), and failure diagnosis of the pressure sensor 11 can be performed with high accuracy. For example, when the air inlet of the pressure sensor 11 is blocked by dust or the like, the sound for failure diagnosis cannot be detected normally by the pressure sensor 11 (because the detected waveform does not enter the corridor), and the pressure sensor 11 is abnormal. It is diagnosed that there is.

In particular, since the airbag apparatus 1 performs failure diagnosis when the ignition is turned on, the failure diagnosis of the pressure sensor 11 can be performed before the vehicle starts running, and the use of the failure pressure sensor 11 during vehicle traveling is prevented as much as possible. it can. In the case of the pressure sensor 11 for collision detection, there is a possibility that an abnormality may not be noticed until a collision actually occurs. However, since the failure diagnosis is performed every time the ignition is turned on, the user can notice the abnormality of the pressure sensor 11 in advance. .

In addition, since the sound and corridor for failure diagnosis are set at the time of vehicle development, even if the door is not installed correctly or the door is modified by the user, it can be detected as a failure of the pressure sensor 11 and the warning light 20 is turned on. It can be lit to make the user aware. As a result, the door can be repaired and a certain collision detection performance can be maintained.

As mentioned above, although embodiment which concerns on this invention was described, this invention is implemented in various forms, without being limited to the said embodiment.

For example, although the present embodiment is applied to a pressure sensor for detecting a side collision of an airbag device, other pressure sensors mounted on a vehicle (for example, a pressure sensor for detecting a negative pressure of an engine, a tire pressure) May be applied to a pressure sensor). Moreover, you may apply to the pressure sensor for collision detection other than the side surface of a vehicle.

In the present embodiment, the failure diagnosis is performed when the ignition is turned on. However, the failure diagnosis may be performed at other timing such as when the engine is stopped after the vehicle travels, or until the ignition is turned off. The failure diagnosis may be performed a plurality of times (for example, when the vehicle stops every certain time).

In this embodiment, a corridor having a predetermined allowable range (two-dimensional) is set as a reference waveform in order to diagnose a failure of the pressure sensor. However, a linear (one-dimensional) reference waveform may be used. In the case of a linear reference waveform, for example, the difference between the detected waveform of the pressure sensor and the reference waveform at regular time intervals is calculated, and it is determined from the time series data of the difference whether or not the pressure sensor has failed. In this determination, for example, it is determined whether or not the difference is within a preset range, and if not, it is determined that the pressure sensor has failed.

In the present embodiment, a failure diagnosis sound prepared in advance when the ignition is turned on is output to diagnose the pressure sensor failure. However, the sound used for failure diagnosis is that of various devices mounted on the vehicle. You may utilize the sound output from a sound output part. For example, when using the alarm sound output from the sound output unit of the pedestrian approach alarm device, the alarm sound is generally a periodic sound, so that it responds to a time-series change in the sound for one cycle of the alarm sound. A corrugated corridor in advance, and when the vehicle approaches a pedestrian and a warning sound is output, a detected waveform that is a time-series change of the detected value detected by the pressure sensor according to the warning sound and its waveform The pressure sensor is compared with the corridor to determine whether or not the pressure sensor has failed.

The present invention can be used for failure diagnosis of an in-vehicle pressure sensor.

DESCRIPTION OF SYMBOLS 1 ... Airbag apparatus, 10 ... Speaker, 11 ... Pressure sensor, 12 ... Ignition switch, 20 ... Warning light, 30 ... Airbag ECU, 31 ... Sound output control part, 32 ... Fault diagnosis part.

Claims

An in-vehicle pressure sensor failure diagnosis device,
A sound output unit for outputting a preset sound;
The detected waveform detected by the pressure sensor according to the sound output from the sound output unit is compared with a reference waveform set in advance for the sound output from the sound output unit, and the failure of the pressure sensor A fault diagnosis unit that diagnoses
A fault diagnosis device for a pressure sensor, comprising:
2. The pressure sensor failure diagnosis apparatus according to claim 1, wherein the sound output from the sound output unit is a sound set in advance as a sound for failure diagnosis of the pressure sensor.
3. The pressure sensor failure diagnosis apparatus according to claim 1, wherein the sound output unit outputs a preset sound when the ignition is turned on.
The pressure sensor failure diagnosis device according to claim 1, wherein the sound output from the sound output unit is a sound from a sound output unit of an in-vehicle alarm device.
The failure diagnosing unit is based on a detection waveform that is a time-series change of a detection value detected by the pressure sensor according to a sound output from the sound output unit and a sound output from the sound output unit. Is compared with a reference waveform set in advance as a time-series change of the output value, and the height of the waveform at an arbitrary time in the detected waveform and the height of the waveform at the time corresponding to the arbitrary time in the reference waveform The pressure sensor failure diagnosis according to any one of claims 1 to 4, wherein when the difference does not fall within a preset range, it is determined that the pressure sensor has failed. apparatus.
6. The pressure sensor failure diagnosis apparatus according to claim 1, wherein the pressure sensor is a pressure sensor for collision detection.
A method for diagnosing a failure of an in-vehicle pressure sensor,
A sound output process for outputting a preset sound;
Comparing the detection waveform detected by the pressure sensor according to the sound output in the sound output step with a reference waveform preset for the sound output in the sound output step, and the failure of the pressure sensor Fault diagnosis process for diagnosing
A fault diagnosis method for a pressure sensor, comprising:
The pressure sensor failure diagnosis method according to claim 7, wherein the sound output in the sound output step is a sound set in advance as a sound for failure diagnosis of the pressure sensor.
The pressure sensor failure diagnosis method according to claim 7 or 8, wherein the sound output step outputs a preset sound when the ignition is ON.
The pressure sensor failure diagnosis method according to claim 7, wherein the sound output in the sound output step is a sound from a sound output unit of an in-vehicle alarm device.
The failure diagnosis step is based on a detection waveform that is a time-series change in a detection value detected by the pressure sensor according to the sound output in the sound output step and a reference for the sound output in the sound output step. Is compared with a reference waveform set in advance as a time-series change of the output value, and the height of the waveform at an arbitrary time in the detected waveform and the height of the waveform at the time corresponding to the arbitrary time in the reference waveform The pressure sensor failure diagnosis according to any one of claims 7 to 10, wherein when the difference does not fall within a preset range, it is determined that the pressure sensor has failed. Method.
The pressure sensor failure diagnosis method according to any one of claims 7 to 11, wherein the pressure sensor is a pressure sensor for collision detection.