JP2010083245A - Alarming device for instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarming device for instruments, enhancing alarming performance by alarm sounds without bringing about deterioration of the sound quality. <P>SOLUTION: The alarming device for instruments is installed on a vehicle on-board instrument 2 to indicate a vehicle conditional value using a display unit 3, and gives a warning about a vehicle situation via an alarm sound emitted from an alarm unit 1. In the alarming device, an instrument control unit 4 corrects the sound pressure amplifying factor of the alarm sound set in accordance with the vehicle situation to be alarmed in compliance with the environmental temperature acquired through sensing with a temperature sensor 32. An acoustic apparatus 12 of the alarm unit 1 emits thereby an alarm sound with the sound pressure amplification factor corrected by the instrument control unit 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an instrument alarm device.

  Conventionally, an alarm device for an instrument that is provided in an instrument that displays a vehicle state value and warns the vehicle state by an alarm sound is known. For example, in an instrument alarm device disclosed in Patent Document 1, an alarm sound having a sound pressure corresponding to a vehicle situation to be alarmed is output from a speaker as an acoustic device.

  Now, in the instrument alarm device, an alarm sound with sufficient sound pressure is required to improve alarm performance by reliably transmitting an alarm sound to a vehicle occupant. On the other hand, in order to ensure the sound quality for the purpose of giving the vehicle a high-class feeling to the occupants, the sound pressure should be kept at a level where the waveform of the alarm sound will not be distorted beyond the capacity of the sounder. Is required. However, since an acoustic device is generally composed of a member having a relatively large temperature characteristic, there is a possibility that a waveform of an alarm sound may be distorted depending on the environmental temperature even under a situation where sound pressure is suppressed. .

As a method for dealing with such distortion of sound waves, Patent Document 2 discloses that when sound waves are distorted at a set temperature or higher, the sound pressure of the sound waves is reduced. According to the method disclosed in Patent Document 2, when the sound wave is not distorted, the sound pressure is secured as it is, and only when the sound wave is distorted, the sound wave distortion is reduced by reducing the sound pressure. It becomes possible.
JP 2007-112347 A JP 2006-304053 A

  Here, when the method disclosed in Patent Document 2 is applied to the instrument warning device disclosed in Patent Document 1, the distortion of the waveform of the alarm sound is used as a trigger to deal with the distortion. Therefore, the alarm sound waveform is distorted at least once, and it is difficult to avoid deterioration of sound quality.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an instrument alarm device that enhances alarm performance by an alarm sound without causing deterioration of the sound quality of the alarm sound.

  The invention according to claim 1 is an alarm device for an instrument which is provided in an instrument for displaying a vehicle state value and warns the vehicle status by an alarm sound, and includes a temperature detection means for detecting an environmental temperature, and an alarm sound. An amplification factor setting unit for setting the pressure amplification factor; an amplification factor correcting unit for correcting the sound pressure amplification factor of the alarm sound set by the amplification factor setting unit according to the environmental temperature detected by the temperature detection unit; And an acoustic device that outputs an alarm sound at a sound pressure amplification factor corrected by the rate correction means.

  In the first aspect of the present invention, the sound pressure gain set by the gain setting means is corrected by the gain correction means, and an alarm sound is output from the sounder at the corrected gain. Here, since the correction of the sound pressure amplification factor is performed according to the environmental temperature detected by the temperature detecting means, the alarm sound waveform is not distorted due to the characteristics of the sounder depending on the environmental temperature. Can be done as follows. Therefore, the alarm performance can be enhanced by the output of the alarm sound that secures the sound pressure that does not cause the sound quality deterioration due to the waveform distortion.

  According to the second aspect of the present invention, the amplification factor setting means sets the sound pressure amplification factor of the alarm sound according to the vehicle situation to be warned. According to this, the sound pressure gain set by the gain setting means is corrected by the gain correction means in accordance with the vehicle situation to be warned, and is used for the output of the warning sound. Therefore, with regard to alarm sounds for warning different vehicle situations, the sound pressure that does not cause deterioration in sound quality due to waveform distortion can be secured at a level corresponding to the vehicle situation, and any alarm performance can be enhanced.

  According to a third aspect of the present invention, there is provided a waveform setting means for setting a waveform of an alarm sound according to a vehicle situation to be warned, and the sounder corrects an amplification factor for the alarm sound of the waveform set by the waveform setting means. The sound is output at the sound pressure amplification factor corrected by the means. According to this, the alarm sound having the waveform set by the amplification factor setting unit according to the vehicle situation to be warned is output at the sound pressure amplification factor corrected by the amplification factor correction unit. Therefore, it is possible to improve the alarm performance without deterioration in sound quality while freely setting the waveform for the alarm sound for warning different vehicle conditions.

  According to the fourth aspect of the present invention, the amplification factor correction means includes a storage unit that stores a correction coefficient of the sound pressure amplification factor that changes according to the environmental temperature, and a temperature detection based on the correction coefficient that is stored in the storage unit. A calculation unit that extracts a correction coefficient corresponding to the environmental temperature detected by the means and multiplies the sound pressure gain of the alarm sound set by the gain setting means. According to this, the calculation unit multiplies the sound pressure gain set by the gain setting means by the sound pressure gain correction coefficient corresponding to the environmental temperature detected by the temperature detecting means, thereby obtaining the sound. The pressure gain can be accurately corrected. Here, as the correction coefficient for the sound pressure amplification factor, since the variable stored in the storage unit as a variable that changes according to the environmental temperature is used for multiplication, the characteristics of the sounder on which the environmental temperature depends Can be accurately reflected in the sound pressure of the alarm sound that outputs.

  The invention according to claim 5 is provided in a meter having a temperature sensor that detects the temperature inside the meter and an adjustment circuit that adjusts the display state of the vehicle state value in accordance with the temperature detected by the temperature sensor. The temperature detected by the temperature sensor is acquired as the environmental temperature. According to this, the internal temperature detected by the temperature sensor for adjusting the display state of the vehicle state value by the adjustment circuit in the instrument is also used for correcting the sound pressure gain as the environmental temperature. Therefore, it is possible to suppress the cost required to enhance the alarm performance by the alarm sound without causing the sound quality of the alarm sound to deteriorate.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Basic configuration)
FIG. 1 shows a configuration of an in-vehicle instrument 2 according to an embodiment of the present invention. The instrument 2 includes a display unit 3 and an instrument control unit 4 common to the units 3 and 1, and is installed on an instrument panel around the driver's seat of the vehicle.

  The display unit 3 includes an image display monitor 30, a display drive circuit 31, and a temperature sensor 32. The image display monitor 30 is arranged with the screen 33 for displaying an image facing the driver's seat. Here, the image display monitor 30 of the present embodiment is a TFT liquid crystal monitor having a screen 33 in which a plurality of pixels are arranged in a matrix, and a full color image is displayed on the screen 33 by driving each pixel. To do.

  The display drive circuit 31 is, for example, a liquid crystal driver IC, which is mounted on a glass substrate constituting the image display monitor 30 and is electrically connected to the monitor 30 and the instrument control unit 4. The display drive circuit 31 drives each pixel of the image display monitor 30 in accordance with a display command input from the instrument control unit 4, thereby indicating an instruction image for instructing a vehicle state value necessary for driving and a vehicle situation requiring attention. Is displayed on the screen 33.

  Here, in the present embodiment, the instruction image includes an image for instructing the range of the automatic transmission as the vehicle state value, an image for instructing the vehicle speed as the vehicle state value, and an image instructing the engine speed as the vehicle state value. Is displayed. In addition, the warning image includes an image that warns the vehicle situation in which the traveling direction is the reverse direction, an image that warns the vehicle situation that is in a high-speed traveling state where the vehicle speed is equal to or higher than a specified speed, and a vehicle situation in which the light is forgotten to be turned off. A warning image is displayed.

  The temperature sensor 32 is a thermistor, for example, and is mounted on the glass substrate of the image display monitor 30 inside the display unit 3 to detect the internal temperature. The temperature sensor 32 is electrically connected to the display drive circuit 31 and outputs the detected temperature to the circuit 31. The display drive circuit 31 changes the voltage applied to the image display monitor 30 in accordance with the temperature detected by the temperature sensor 32 in response to the input of the detected temperature, so that the image display state (for example, contrast) on the screen 33 is substantially constant. Adjust to. The temperature sensor 32 is further electrically connected to the instrument control unit 4 and outputs the detected temperature to the device 4.

  The alarm unit 1 includes a sound source circuit 10, an amplifier circuit 11, and an acoustic device 12. The sound source circuit 10 is, for example, a monaural or stereo sound source IC or the like, and is housed inside the display unit 3 and electrically connected to the instrument control unit 4. The sound source circuit 10 generates an acoustic signal according to a sound generation command input from the instrument control unit 4 in order to output an alarm sound for warning a vehicle situation that requires attention from the sounder 12.

  Here, as the alarm sound of the present embodiment, in correspondence with the above-described warning image, there is a reverse travel warning sound for warning the vehicle situation in which the travel direction is the reverse direction, and a high speed travel state where the vehicle speed is equal to or higher than a specified speed. A high-speed running warning sound for warning the vehicle status and a light extinction warning sound for warning the vehicle status in which the lights are forgotten to be turned off are output. Therefore, in accordance with the sound generation command from the instrument control unit 4, the sound source circuit 10 has an acoustic signal having a waveform and frequency corresponding to the type of alarm sound corresponding to the vehicle situation to be warned and having an amplitude not depending on the type. Generate. In the present embodiment, a low-frequency sine signal or cosine signal is generated as an acoustic signal for backward running warning sound and light extinction warning sound, and as an acoustic signal for high-speed traveling warning sound with high urgency, A high frequency square signal is generated.

  The amplifier circuit 11 is, for example, a linear amplifier type amplifier IC and is housed in the display unit 3 and electrically connected to the sound source circuit 10 and the instrument control unit 4. The amplification circuit 11 amplifies the amplitude of the acoustic signal input from the sound source circuit 10 in accordance with the amplification command input from the instrument control unit 4.

  Here, amplifying the amplitude of the acoustic signal is substantially equivalent to amplifying the sound pressure of the alarm sound output by the signal. Further, in the present embodiment in which a plurality of types of alarm sounds are prepared as described above, the sound pressure amplification factor of the alarm sound is defined in advance according to the type. Furthermore, according to the knowledge obtained from the diligent research of the present inventor, when the sound pressure of the alarm sound is high when the environmental temperature is lowered, the waveform of the alarm sound is easily distorted as an output characteristic from the sounder 12. Accordingly, the amplifier circuit 11 performs an amplification process according to an amplification command from the instrument control unit 4 in order to output an alarm sound with a sound pressure corresponding to the type of alarm sound corresponding to the vehicle situation to be warned and the environmental temperature. Perform on the signal. In the present embodiment, the amplification of the acoustic signal is performed so that the sound pressure increases in the order of the backward running warning sound, the high speed running warning sound, and the light extinction warning sound.

  The sounder 12 is a speaker, which is disposed with the sound wave output unit 13 facing the driver's seat and is electrically connected to the amplifier circuit 11. The sounder 12 converts the amplified sound signal input from the amplifier circuit 11 into an alarm sound corresponding to the signal and outputs the alarm sound.

  The instrument control unit 4 is composed mainly of a microcomputer 40 and an interface circuit 41, and is housed inside the display unit 3, and is accommodated in the sensors 5 to 8 of the vehicle, the display drive circuit 31 of the display unit 3, and the circuit 10 of the alarm unit 1. , 11 are electrically connected. Here, the range sensor 5 detects the range of the automatic transmission, and the vehicle speed sensor 6 detects the vehicle speed. In this embodiment, the rotation speed sensor 7 substituted by the engine control unit detects the engine rotation speed, and the light sensor 8 detects the light on / off state. Therefore, the instrument control unit 4 shapes the waveform of the detection signal input from each of the sensors 5 to 8 by the interface circuit 41, and based on the detection result of each of the sensors 5 to 8 represented by the shaped detection signal, 10 and 11 are controlled by the microcomputer 40.

  That is, the instrument control unit 4 always displays an instruction image for instructing the detection range of the range sensor 5, an instruction image for instructing the detection speed of the vehicle speed sensor 6, and an instruction image instructing the detection rotation speed of the rotation speed sensor 7. An output display command is generated to the display drive circuit 31 so as to display.

  When a vehicle situation that should be warned occurs, the instrument control unit 4 outputs a display command to the display drive circuit 31 and outputs a sound to the sound source circuit 10 so as to display a corresponding warning image and output a corresponding warning sound. Generate a sound generation command and an amplification command for output to the amplifier circuit 11. Specifically, when the detection range of the range sensor 5 is the reverse (R) range, the instrument control unit 4 displays a warning image that warns the vehicle situation in which the traveling direction is the reverse direction, and warns the situation. Output commands to the respective circuits 31, 10, and 11 are generated so as to output a reverse running warning sound. In addition, when the detection speed of the vehicle speed sensor 6 is equal to or higher than the specified speed, the instrument control unit 4 displays a warning image that warns of a vehicle situation where the vehicle speed is equal to or higher than the specified speed, and outputs a high-speed traveling warning sound that warns the situation In this manner, an output command to each circuit 31, 10, 11 is generated. Furthermore, when it is confirmed that the light has been forgotten to be turned off based on the detection result of the light sensor 8, the instrument control unit 4 displays a warning image for warning the vehicle situation for which the light has been forgotten to turn off, and a light extinction alarm for warning the situation. Output commands to the circuits 31, 10, and 11 are generated so as to output sound.

(Amplification command generation processing)
In the instrument control unit 4 described above, the process of generating an amplification command for outputting various alarm sounds is characteristic according to the present invention, and the details thereof will be described below.

  The instrument control unit 4 sets the amplitude amplification factor G of the acoustic signal so as to coincide with the sound pressure amplification factor of the alarm sound according to the vehicle situation when a vehicle situation to be warned occurs. Here, in the present embodiment, the sound pressure amplification factor of the warning sound is defined in advance for each vehicle situation to be warned, and the storage unit 40a (for example, EEPROM) of the microcomputer 40 in FIG. 1 in a map format as shown in FIG. Is remembered. Thereby, in the instrument control unit 4, the calculation unit 40b (for example, CPU) of the microcomputer 40 in FIG. 1 extracts the value corresponding to the vehicle situation to be warned out of the sound pressure gain stored in the storage unit 40a. The extracted value is adopted as the amplitude amplification factor G of the acoustic signal.

  However, in this embodiment, since the temperature dependency as described above exists in the output characteristic of the alarm sound from the sounder 12, the amplitude amplification factor G of the acoustic signal that matches the sound pressure amplification factor of the alarm sound is set to the environmental temperature. If the value is set to a constant value, the alarm sound waveform output by the sound signal may be distorted. Therefore, the instrument control unit 4 corrects the amplitude amplification factor G of the acoustic signal once set by the coefficient k corresponding to the environmental temperature.

  Here, the temperature dependence of the output characteristics from the sounder 12 generally shows a constant tendency that does not substantially depend on the type of alarm sound with respect to a change in environmental temperature. Therefore, in the present embodiment, a correction coefficient for the sound pressure amplification factor of the alarm sound is defined in advance for each environmental temperature and stored in the storage unit 40a of the microcomputer 40 in FIG. 1 in a map format as shown in FIG. . In order to reduce costs, the temperature control 32 of the display unit 3 is electrically connected to the instrument control unit 4 as described above, so that the internal temperature of the device 3 is input as the environmental temperature. . Therefore, in the instrument control unit 4, the calculation unit 40b of the microcomputer 40 extracts a value corresponding to the temperature detected by the temperature sensor 32 based on the correction coefficient of the sound pressure gain stored in the storage unit 40a. At this time, in the present embodiment in which the correction coefficient is defined for the discrete value of the environmental temperature by the map format as shown in FIG. 3, the correction coefficient corresponding to the environmental temperature sandwiching the temperature detected by the temperature sensor 32 is interpolated. Thus, a value corresponding to the detected temperature is extracted. Then, the value extracted in this way is adopted as the correction coefficient k multiplied by the amplitude amplification factor G by the calculation unit 40b.

  As described above, the correction amplification factor G × k obtained by multiplying the amplitude amplification factor G by the correction factor k is output from the instrument control unit 4 to the amplification circuit 11 as an amplification command, so that the sound corresponding to the vehicle condition to be warned is sounded. The amplitude of the signal is amplified at the rate G × k. Therefore, when the amplitude-amplified acoustic signal is output from the amplifier circuit 11 to the sounder 12, the warning sound is generated with the sound pressure amplification factor that accurately reflects the vehicle condition and the environmental temperature that are the warning target. It is emitted from the output unit 13 of the sounder 12.

(Method for defining the sound pressure gain and its correction factor for alarm sounds)
In the above-described generation process of the amplification command, the sound pressure amplification factor of the alarm sound and the correction factor thereof stored in the storage unit 40a of the instrument control unit 4 in order to set the amplitude amplification factor G of the acoustic signal and the correction factor k thereof. Details of the defining method will be described below.

  FIG. 4 shows a measurement unit 100 for measuring the output characteristics of the sounder 12. The measurement unit 100 includes a thermostatic chamber 101, a microphone 102, a waveform observer 103, and a measurement control unit 104. Inside the thermostatic chamber 101, an alarm unit 1 prepared for measurement is accommodated. The constant temperature bath 101 can adjust the internal temperature of the constant temperature bath 101 according to the operation of the measurement operator by means of a temperature controller 101a installed therein. The microphone 102 is set at a position facing the output unit 13 of the sounder 12 exposed to the outside from the tank 101 among the constituent elements 10, 11, and 12 of the alarm unit 1 housed in the thermostatic chamber 101. . The waveform observer 103 is electrically connected to the microphone 102 and observes the waveform of the output sound of the sounder 12 collected by the microphone 102. The measurement control unit 104 has substantially the same configuration as the instrument control unit 4 except that the measurement control unit 104 is not electrically connected to the sensors 5 to 8 and 32 and the display drive circuit 31. The amplification command can be generated according to the operation of the measurement operator.

  The work flow of the measurement operator for defining the sound pressure amplification factor of the alarm sound and the correction coefficient using such a measurement unit 100 will be described in detail below with reference to FIG. This work flow is performed, for example, from when the specifications of the meter 2 are determined until the manufacture of the product is started.

  In S100 of the work flow, one type of alarm sound is selected as a measurement alarm sound from the reverse traveling alarm sound, the high speed traveling alarm sound and the light extinction alarm sound prepared as the alarm sound in the present embodiment. Next, in S101, the internal temperature of the thermostat 101 is set to a predetermined maximum temperature (for example, 50 ° C.) by the temperature controller 101a.

  In subsequent S102, the waveform and frequency of the acoustic signal for outputting the measurement warning sound are input from the measurement control unit 104 to the sound source circuit 10 as a sound generation command. In subsequent S103, the sound pressure amplification factor of the measurement warning sound is set to a predetermined minimum measurement rate (for example, 0.5). In subsequent S104, the amplitude amplification factor of the acoustic signal that matches the measurement rate set in the immediately preceding step in S103 and S106 described later is input from the measurement control unit 104 to the sound source circuit 10 as an amplification command. As a result, when a measurement warning sound is emitted from the output unit 13 of the sounder 12, the waveform of the measurement warning sound collected by the microphone 102 is observed by the waveform observer 103 in S105, and the waveform is distorted. Check if it exists.

  If waveform distortion of the measurement alarm sound is not confirmed in S105, the measurement rate for the sound pressure gain of the measurement alarm sound is increased by a predetermined amount (for example, 0.1) in S106, and S104 to S105 are repeated. . On the other hand, when the waveform distortion of the measurement alarm sound is confirmed in the repeated S105, the measurement rate according to S106 or S103 one or more before the latest S106 is not caused in S107 to cause the waveform distortion of the measurement alarm sound. It is set as the maximum sound pressure gain (hereinafter simply referred to as “maximum gain”).

  In S108 after S107, it is determined whether or not the current measured temperature is a predetermined minimum temperature (for example, −40 ° C.) with respect to the internal temperature of the thermostatic chamber 101. As a result, until the measured temperature reaches the minimum temperature, the set value of the measured temperature is decreased by a predetermined amount (for example, 10 ° C.) by the temperature controller 101a in S109, and S102 to S108 are repeated. As described above, with respect to the alarm sound selected as the measurement alarm sound in S101, the maximum amplification factor is determined for each measurement temperature.

  And S101-S109 demonstrated so far are repeated until the maximum amplification factor for every measurement temperature is determined about all types of alarm sound by determination of S110 and the change of the measurement alarm sound in S111. Thus, in S112 after the maximum amplification factor for each measurement temperature is determined for all types of alarm sounds as shown in FIG. 6, the maximum amplification factor when the measurement temperature is normal temperature (for example, 20 ° C.) for each of the alarm sounds, The sound pressure gain stored in the storage unit 40a of the instrument control unit 4 is defined as shown in FIG. Furthermore, in S113, based on the maximum amplification factor for each measurement temperature determined for each alarm sound as shown in FIG. 6, the correction coefficient for storing in the storage unit 40a the ratio of the maximum amplification factor for each measurement temperature to the maximum amplification factor at room temperature. Is defined as shown in FIG.

(Alarm sound output flow)
The alarm sound output flow performed by the instrument control unit 4 based on the contents described above will be described in detail below with reference to FIG. This alarm sound output flow starts when the power supply voltage is supplied to the meter 2 in response to turning on of the ignition switch of the vehicle, and ends when the power supply is stopped.

  In S10 of the warning sound output flow, it is determined whether or not a warning condition for warning the vehicle situation is satisfied. Here, the warning condition includes a first condition in which the detection range of the range sensor 5 is the R range (that is, the traveling direction is the reverse direction), a second condition in which the detection speed of the vehicle speed sensor 6 is equal to or higher than a specified speed, A third condition for confirming that the light is forgotten to be turned off from the detection result of the sensor 8 is defined in advance. Therefore, in the present embodiment, S10 is repeated while none of the first to third conditions as the warning condition is satisfied, and S11 is executed when one of the first to third conditions is satisfied.

  In S11, the internal temperature of the display unit 3 is acquired from the temperature sensor 32 as the environmental temperature. In subsequent S12, the coefficient k corresponding to the environmental temperature acquired in S11 is extracted based on the correction coefficient of the sound pressure gain stored in the storage unit 40a. In subsequent S13, the corresponding amplification factor G of the vehicle situation targeted by the warning condition determined in S10 is extracted from the sound pressure amplification factors stored in the storage unit 40a. In the subsequent S14, the corrected amplification factor G × k is calculated by multiplying the coefficient k and the amplification factor G extracted in S12 and S13.

  In S15 after this, a waveform and frequency corresponding to the vehicle situation targeted by the warning condition determined in S10 are output to the sound source circuit 10 as a sound generation command. In S16, the corrected amplification factor G × k calculated in S14 is output to the amplifier circuit 11 as an amplification command. As a result, a warning sound having a waveform and frequency corresponding to the vehicle situation to be warned is output from the sounder 12 at a sound pressure gain corresponding to not only the vehicle situation but also the environmental temperature.

  In S17 following S16, it is determined whether or not the warning condition established in S10 is continuously satisfied. As a result, when the first to third conditions as the warning conditions are continuously established, the process returns to S11 and repeats the S11 and the subsequent S12 to S17. If one is satisfied, the process returns to S10 and waits for the next warning condition to be satisfied.

  As described so far, in this embodiment, the correction of the amplitude amplification factor G of the acoustic signal that matches the sound pressure amplification factor of the alarm sound is performed by correcting the waveform of the alarm sound from the characteristics of the acoustic device 12 depending on the environmental temperature. This is realized by multiplication of a predetermined correction coefficient k so as not to cause it. In addition, the acoustic signal corrected in this way has a waveform, a frequency, and an amplitude amplification factor G, all set according to the type of vehicle situation to be warned. Therefore, according to the present embodiment, for a plurality of types of alarm sounds whose waveforms and frequencies are freely set according to the specifications of the meter 2, sound pressure that does not cause deterioration in sound quality due to waveform distortion is secured at a level according to the vehicle situation. Any alarming property can be enhanced.

  As described above, in the present embodiment, the alarm unit 1, the instrument control unit 4 and the temperature sensor 32 jointly constitute the “instrument alarm device” described in the claims, and the temperature sensor 32 and the instrument control unit 4 jointly. The instrument control unit 4 that constitutes the “temperature detection means” recited in the claims and sets the amplitude amplification factor of the acoustic signal that matches the sound pressure amplification factor of the alarm sound and the correction coefficient thereof is substantially patented. This corresponds to “amplification factor setting unit” and “amplification factor correction unit” recited in the claims. In this embodiment, the instrument control unit 4 that sets the waveform of the acoustic signal that matches the waveform of the alarm sound substantially corresponds to the “waveform setting means” recited in the claims, and is driven by display. The circuit 31 corresponds to an “adjustment circuit” recited in the claims.

(Other embodiments)
Although one embodiment of the present invention has been described above, the present invention is not construed as being limited to the embodiment described, and can be applied to various embodiments without departing from the scope of the invention.

  Specifically, for the sound pressure amplification factor of the alarm sound and its correction coefficient, in addition to the map format described above, for example, the correction amplification factor G × k is calculated using the environmental temperature (detected temperature of the temperature sensor 32) as a variable. You may memorize | store in the memory | storage part 40a of the instrument control unit 4 with the form of a computing equation. When the temperature dependence of the output characteristics from the sounder 12 tends to depend on the type of alarm sound with respect to changes in the environmental temperature, the correction coefficient for the sound pressure gain of the alarm sound is set as the type of alarm sound. You may prescribe | regulate separately for every and may memorize | store each in the memory | storage part 40a of the instrument control unit 4. FIG. In addition to the temperature sensor 32 of the display unit 3, a “temperature detection unit” such as a thermistor may be disposed in the vicinity of the sounder 12, for example, and the ambient temperature may be detected by the “temperature detection unit”. .

  As for the vehicle situation to be warned by the alarm sound output from the sounder 12, as long as various situations of the vehicle needing attention, in addition to the reverse running situation, the high speed running situation and the forgetting to turn off the lights, for example, a door May be an open state, a tire pressure decrease state, a battery voltage decrease state, or the like. Further, instead of the range sensor 5 that detects the range of the automatic transmission in order to determine the reverse travel state, for example, a sensor that detects the shift stage of the manual transmission or the reverse travel of the vehicle regardless of the type of transmission. You may make it employ | adopt the sensor etc. for exclusive use which detect a condition. Furthermore, the display unit 3 may be a unit for instructing a vehicle state value by a pointer display, for example, in addition to the unit for instructing the vehicle state value by an image display as described above.

It is a block diagram which shows the vehicle-mounted instrument by one Embodiment of this invention. It is a schematic diagram for demonstrating the sound pressure gain of the alarm sound by one Embodiment of this invention. It is a schematic diagram for demonstrating the correction coefficient of the sound pressure gain of an alarm sound by one Embodiment of this invention. It is a block diagram which shows the measurement unit used in one Embodiment of this invention. It is a flowchart which shows the work flow for prescribing | regulating the sound pressure gain and its correction coefficient of an alarm sound in one Embodiment of this invention. It is a schematic diagram for demonstrating the work flow of FIG. It is a flowchart which shows the alarm sound output flow by one Embodiment of this invention.

Explanation of symbols

1 Alarm unit (Instrument alarm device), 2 On-board instrument, 3 Display unit, 4 Instrument control unit (Instrument alarm device / Temperature detection unit / Amplification factor setting unit / Amplification factor correction unit / Waveform setting unit), 5 Range sensor , 6 Vehicle speed sensor, 7 Rotational speed sensor, 8 Light sensor, 10 Sound source circuit, 11 Amplification circuit, 12 Sound device, 30 Image display monitor, 31 Display drive circuit (Adjustment circuit), 32 Temperature sensor (Instrument alarm / temperature for instrument) Detection means), 33 screen, 40 microcomputer, 40a storage unit, 40b arithmetic unit, 41 interface circuit, 100 measurement unit, 101 thermostat, 101a temperature controller, 102 microphone, 103 waveform observer, 104 control unit for measurement

Claims (5)

An alarm device for an instrument that is provided in an instrument that displays a vehicle state value and warns the vehicle status by an alarm sound,
Temperature detection means for detecting the environmental temperature;
An amplification factor setting means for setting a sound pressure amplification factor of the warning sound;
An amplification factor correction unit that corrects the sound pressure amplification factor set by the amplification factor setting unit according to the environmental temperature detected by the temperature detection unit;
An acoustic device that outputs the alarm sound at the sound pressure gain corrected by the gain correction means;
An instrument alarm device comprising:   2. The instrument alarm device according to claim 1, wherein the amplification factor setting means sets the sound pressure amplification factor according to the vehicle condition to be warned. Waveform setting means for setting the waveform of the alarm sound according to the vehicle situation to warn,
The said sounder outputs the said warning sound of the waveform set by the said waveform setting means with the said sound pressure gain corrected by the said gain correction means. Instrument alarm device. The amplification factor correcting means includes
A storage unit that stores a correction coefficient of the sound pressure amplification factor that changes according to the environmental temperature;
Based on the correction coefficient stored in the storage unit, the correction coefficient corresponding to the environmental temperature detected by the temperature detection unit is extracted, and the sound pressure gain set by the amplification rate setting unit is extracted. An arithmetic unit to multiply;
The instrument alarm device according to any one of claims 1 to 3, characterized by comprising: A temperature sensor for detecting the temperature inside the meter, and the meter having an adjustment circuit for adjusting the display state of the vehicle state value according to the detected temperature of the temperature sensor;
The instrument alarm device according to any one of claims 1 to 4, wherein the temperature detection unit acquires the temperature detected by the temperature sensor as the environmental temperature.

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