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JP2009101895A - On-vehicle buzzer sound pressure control device - Google Patents

On-vehicle buzzer sound pressure control device Download PDF

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JP2009101895A
JP2009101895A JP2007276022A JP2007276022A JP2009101895A JP 2009101895 A JP2009101895 A JP 2009101895A JP 2007276022 A JP2007276022 A JP 2007276022A JP 2007276022 A JP2007276022 A JP 2007276022A JP 2009101895 A JP2009101895 A JP 2009101895A
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sound pressure
vehicle
outside air
buzzer
air temperature
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JP4468982B2 (en
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Kazunari Mori
一功 森
Toshiyuki Utsumi
淑之 内海
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for holding and outputting the sound pressure level of a buzzer as intended. <P>SOLUTION: The device includes a piezoelectric buzzer mounted on a vehicle, and a correcting control-drive part for PWM controlling a drive signal for the piezoelectric buzzer to change the sound pressure level of the piezoelectric buzzer, correct the duty ratio of the drive signal depending on the temperature of outside air, and keep the sound pressure level as desired. An on-vehicle LAN communication line is used for acquiring information for the temperature of outside air from equipment control part which controls an vehicle engine or an air-conditioner, depending on the temperature of outside air detected by an outside air temperature sensor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、特に他励式圧電振動板で構成された車載用圧電ブザーの音圧レベルを、意図する音圧に制御する車載用ブザー音圧制御装置に関するものである。   The present invention relates to a vehicle-mounted buzzer sound pressure control device that controls the sound pressure level of a vehicle-mounted piezoelectric buzzer composed of a separately excited piezoelectric diaphragm to an intended sound pressure.

他励式圧電振動板で構成された圧電ブザーにおいて音圧制御を行う方式として、例えば、特許文献１では、ＰＷＭ方式を用いることで音圧レベルを切替える方式が述べられている。   As a method of performing sound pressure control in a piezoelectric buzzer configured with a separately excited piezoelectric diaphragm, for example, Patent Document 1 describes a method of switching a sound pressure level by using a PWM method.

また、ＰＷＭ方式を用いない方式として、特許文献２では、ブザー印加電流を調整することで音圧レベルを切替える方式が述べられている。   Further, as a method that does not use the PWM method, Patent Document 2 describes a method in which the sound pressure level is switched by adjusting the buzzer applied current.

特開平11−153994号公報Japanese Patent Laid-Open No. 11-153994 特開2002−14680号公報Japanese Patent Laid-Open No. 2002-14680

一般に、圧電ブザーは圧電素子および共鳴箱が周囲温度の影響を受けやすいため、外気温度によってブザーの音圧レベルが左右される。したがって、特許文献１で述べられている音圧レベルの切替え方式だけでは、意図する音圧レベルを維持することは困難である。   In general, since the piezoelectric element and the resonance box of the piezoelectric buzzer are easily affected by the ambient temperature, the sound pressure level of the buzzer is influenced by the outside air temperature. Therefore, it is difficult to maintain the intended sound pressure level only by the sound pressure level switching method described in Patent Document 1.

この発明は、上記の事情に鑑みてなされたものであり、ＰＷＭ制御及び温度条件を組み合わせることにより、意図するブザーの音圧レベルを維持出力する装置を提供することを目的とする。   This invention is made in view of said situation, and it aims at providing the apparatus which maintains and outputs the sound pressure level of the intended buzzer by combining PWM control and temperature conditions.

この発明の車載用ブザー音圧制御装置は、車両に搭載された圧電ブザーと、この圧電ブザーの駆動信号をＰＷＭ制御することにより上記圧電ブザーの音圧レベルを変えると共に、外気温度に応じて上記駆動信号のデューティー比を補正し、上記音圧レベルを所望レベルに保つ補正制御・駆動部とを備えたことを特徴とするものである。   The on-vehicle buzzer sound pressure control device of the present invention changes the sound pressure level of the piezoelectric buzzer by PWM control of the piezoelectric buzzer mounted on the vehicle and the drive signal of the piezoelectric buzzer, and also changes the sound pressure level according to the outside air temperature. A correction control / drive unit that corrects the duty ratio of the drive signal and maintains the sound pressure level at a desired level is provided.

また、上記装置において、上記外気温度の情報は、車両に搭載された外気温センサーで検出した外気温度に応じて、当該車両のエンジン制御またはエアコン制御を行う機器制御部から車載ＬＡＮ通信回線を用いて取得するようにしたことを特徴とするものである。   Further, in the above apparatus, the information on the outside air temperature is obtained using an in-vehicle LAN communication line from a device control unit that performs engine control or air conditioner control of the vehicle according to the outside air temperature detected by an outside air temperature sensor mounted on the vehicle. It is characterized in that it is acquired.

この発明によれば、周囲温度の変動に関わらず、所望のブザー音圧を精度良く出力することを可能とする車載用ブザー音圧制御装置を提供することができる。   According to the present invention, it is possible to provide a vehicle-mounted buzzer sound pressure control device that can output a desired buzzer sound pressure with high accuracy regardless of changes in ambient temperature.

また、車両のエンジン制御またはエアコン制御を行う既設の温度センサーからの温度情報を利用することにより、最小の部品で装置を実現できる。   Further, by using temperature information from an existing temperature sensor that performs vehicle engine control or air conditioner control, the apparatus can be realized with a minimum number of components.

実施の形態１．
以下、この発明の実施形態について、図を用いて説明する。図１は、この発明に係る車載用ブザー音圧制御装置を示す構成図、図２は圧電ブザーの駆動電流を示す図、図３、図４は各外気温度における駆動信号のデューティー（ＤＵＴＹ）比と音圧レベルの関係を示したＤＵＴＹ比−温度−音圧マップ、図５はブザー駆動要求が発生した場合の音圧制御出力手順を示すフローチャートである。 Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an in-vehicle buzzer sound pressure control device according to the present invention, FIG. 2 is a diagram showing a drive current of a piezoelectric buzzer, and FIGS. 3 and 4 are drive signal duty ratios at each outside air temperature. DUTY ratio-temperature-sound pressure map showing the relationship between the sound pressure level and FIG. 5 is a flowchart showing a sound pressure control output procedure when a buzzer drive request is generated.

図１において、実施の形態１に係る車載用ブザー音圧制御装置は、補正制御・駆動部１と、車両に搭載され、補正制御・駆動部１により駆動される他励式圧電ブザー２と、車両に搭載された外気温センサー１４による外気温信号を受けて当該車両のエンジンやエアコンの制御信号を出力する機器制御部１０と、この機器制御部１０の制御信号を補正制御・駆動部１に伝える車載ＬＡＮ通信回路２０とからなる。上記他励式圧電ブザー２は、駆動回路からブザー特性に応じた方形波信号を印加することで吹鳴音を発生する。   In FIG. 1, an in-vehicle buzzer sound pressure control device according to Embodiment 1 includes a correction control / drive unit 1, a separately excited piezoelectric buzzer 2 mounted on a vehicle and driven by the correction control / drive unit 1, and a vehicle A device control unit 10 that receives an outside air temperature signal from the outside air temperature sensor 14 mounted on the vehicle and outputs a control signal for the engine and air conditioner of the vehicle, and transmits the control signal of the device control unit 10 to the correction control / drive unit 1. And an in-vehicle LAN communication circuit 20. The separately excited piezoelectric buzzer 2 generates a sound by applying a square wave signal corresponding to the buzzer characteristics from the drive circuit.

補正制御・駆動部１は、ブザー音圧制御並びに温度補正を行うためのＣＰＵ３を備え、このＣＰＵ３に、車載ＬＡＮ通信回路２０に接続された車載ＬＡＮ通信インターフェース４を通して外気温度に応じた制御信号が入力される。ＣＰＵ３では、外気温度に応じた制御信号に基づいて出力信号を補正処理し、圧電ブザー駆動回路５に供給する。圧電ブザー２に電流を供給するための圧電ブザー駆動回路５は、ＣＰＵ３の指令により、ＰＷＭ制御されたＤＵＴＹ比の異なる出力電流３０〜３２のいずれかを出力し、圧電ブザー２を駆動する。   The correction control / drive unit 1 includes a CPU 3 for performing buzzer sound pressure control and temperature correction, and a control signal corresponding to the outside air temperature is transmitted to the CPU 3 through the in-vehicle LAN communication interface 4 connected to the in-vehicle LAN communication circuit 20. Entered. In the CPU 3, the output signal is corrected based on a control signal corresponding to the outside air temperature and supplied to the piezoelectric buzzer driving circuit 5. A piezoelectric buzzer drive circuit 5 for supplying a current to the piezoelectric buzzer 2 outputs any one of output currents 30 to 32 having different DUTY ratios under PWM control according to a command from the CPU 3 to drive the piezoelectric buzzer 2.

圧電ブザー駆動回路５の出力電流である３０〜３２は、方形波信号であって、図２に示すように、圧電ブザー２に供給される電流のＤＵＴＹ比が、意図する音圧によってＰＷＭ制御される。３０は音圧が大の、ＯＮ ＤＵＴＹが５０％時の圧電ブザーＤＵＴＹ駆動電流値、３１は音圧が中の、ＯＮ ＤＵＴＹが３０％時の圧電ブザーＤＵＴＹ駆動電流値、３２は音圧が小の、ＯＮ ＤＵＴＹが１０％時の圧電ブザーＤＵＴＹ駆動電流値を示す。これら各駆動電流は、必要に応じてＣＰＵ３により切替えられる。   The output currents 30 to 32 of the piezoelectric buzzer driving circuit 5 are square wave signals. As shown in FIG. 2, the duty ratio of the current supplied to the piezoelectric buzzer 2 is PWM-controlled by the intended sound pressure. The 30 is the piezoelectric buzzer DUTY drive current value when the sound pressure is large and ON DUTY is 50%, 31 is the piezoelectric buzzer DUTY drive current value when the sound pressure is medium and ON DUTY is 30%, and 32 is the sound pressure is small The piezoelectric buzzer DUTY drive current value when ON DUTY is 10% is shown. These drive currents are switched by the CPU 3 as necessary.

機器制御部１０は、外気温センサー１４の情報を用いて制御を行うエンジン制御装置またはエアコン制御装置で、通常はどの車両にも設置されており、車載ＬＡＮ通信インターフェース１１、エンジン制御またはエアコン制御を司るＣＰＵ１２、および外気温センサー１４の温度情報を入力するためのセンサー信号入力インターフェース１３を備えている。   The device control unit 10 is an engine control device or an air conditioner control device that performs control using information from the outside air temperature sensor 14, and is usually installed in any vehicle, and performs in-vehicle LAN communication interface 11, engine control or air conditioner control. A sensor signal input interface 13 for inputting temperature information of the CPU 12 and the outside air temperature sensor 14 is provided.

補正制御・駆動部１に設けられた車載ＬＡＮ通信インターフェース４は、同じ車両に搭載されているエンジン制御装置又はエアコン制御装置の車載ＬＡＮ通信インターフェース１１と、ＬＡＮ通信回線２０を介して接続され、エンジン制御装置またはエアコン制御装置つまり機器制御部１０に接続されている外気温センサー１４の温度情報を、補正制御・駆動部１が受信する形態になっている。   An in-vehicle LAN communication interface 4 provided in the correction control / drive unit 1 is connected to an in-vehicle LAN communication interface 11 of an engine control device or an air conditioner control device mounted on the same vehicle via a LAN communication line 20, and an engine. The correction control / drive unit 1 receives temperature information of the outside air temperature sensor 14 connected to the control device or the air conditioner control device, that is, the device control unit 10.

なお、本実施の形態１ではエンジン制御装置またはエアコン制御装置を、機器制御部１０として車載用ブザー音圧制御装置の一要素に利用しているが、後述する実施の形態２に示すように、機器制御部１０を利用せず、外気温センサー１４を直接補正制御・駆動部１に接続してもよい。   In the first embodiment, the engine control device or the air conditioner control device is used as one element of the vehicle-mounted buzzer sound pressure control device as the device control unit 10, but as shown in the second embodiment to be described later, The outside air temperature sensor 14 may be directly connected to the correction control / drive unit 1 without using the device control unit 10.

図３は圧電ブザー駆動出力電流値の各ＤＵＴＹ比（１０％〜５０％）について、温度−音圧レベルを示したマップである。一般に圧電ブザーの音圧は、約２０℃の室温時を音圧のピークとして、高温側、低温側に推移すると低下する傾向にある。図４は、図３のマップ情報を基に、各外気温度Ｔ（２０℃、４０℃、０℃、８５℃、−４０℃）について、ＤＵＴＹ比−音圧レベルを示したマップであり、補正制御・駆動部１のＣＰＵ３内部の不揮発性メモリーには本マップが記憶されている。   FIG. 3 is a map showing the temperature-sound pressure level for each DUTY ratio (10% to 50%) of the piezoelectric buzzer drive output current value. In general, the sound pressure of a piezoelectric buzzer tends to decrease as the sound pressure peaks at room temperature of about 20 ° C. and shifts to a high temperature side and a low temperature side. FIG. 4 is a map showing the DUTY ratio-sound pressure level for each outside air temperature T (20 ° C., 40 ° C., 0 ° C., 85 ° C., −40 ° C.) based on the map information of FIG. This map is stored in a nonvolatile memory inside the CPU 3 of the control / drive unit 1.

この発明の車載用ブザー音圧制御装置に使用する補正制御・駆動部１のＣＰＵ３は、同一周期でＤＵＴＹ比を切替えた信号を出力することが可能であり、ＣＰＵ３中の不揮発性メモリーには、外気温度−音圧レベル−ＤＵＴＹ比の相関関係をメモリーマップとして予め記憶しており、ユーザーが指定した音圧レベルＰｉに対して、外気温度Ｔをパラメータとして、出力信号のＤＵＴＹ比が得られるようになっている。   The CPU 3 of the correction control / drive unit 1 used in the in-vehicle buzzer sound pressure control device of the present invention can output a signal in which the DUTY ratio is switched in the same cycle, and the nonvolatile memory in the CPU 3 includes The correlation between the outside air temperature, the sound pressure level, and the DUTY ratio is stored in advance as a memory map, and the DUTY ratio of the output signal can be obtained with the outside air temperature T as a parameter for the sound pressure level Pi specified by the user. It has become.

以下、動作を、図５を用いて説明する。圧電ブザー駆動要求が発生した場合、ステップＳ１において補正制御・駆動部１のＣＰＵ３に記憶されている目標出力音圧値Ｐｉを読み込む。ステップＳ２において、外気センサー１４で検出した外気温度情報Ｔを、ＬＡＮ通信回線２０を介して、ＬＡＮ通信回線２０に接続されている機器制御部１０から読み込む。ステップＳ３において、外気温度と目標出力音圧値に対応するブザー駆動電流用ＤＵＴＹ比Ｖｄを算出する。ステップＳ４において、算出されたＤＵＴＹ比Ｖｄを用いて圧電ブザー駆動回路５から駆動電流を出力し、圧電ブザー２を駆動する。その結果、圧電ブザー２は、ＤＵＴＹ比が補正された駆動電流で駆動される。   Hereinafter, the operation will be described with reference to FIG. When the piezoelectric buzzer drive request is generated, the target output sound pressure value Pi stored in the CPU 3 of the correction control / drive unit 1 is read in step S1. In step S <b> 2, the outside air temperature information T detected by the outside air sensor 14 is read from the device control unit 10 connected to the LAN communication line 20 via the LAN communication line 20. In step S3, the buzzer drive current DUTY ratio Vd corresponding to the outside air temperature and the target output sound pressure value is calculated. In step S4, a drive current is output from the piezoelectric buzzer drive circuit 5 using the calculated DUTY ratio Vd, and the piezoelectric buzzer 2 is driven. As a result, the piezoelectric buzzer 2 is driven with a drive current with a corrected DUTY ratio.

従来は、外気温度に対する圧電ブザー駆動用電流の制御補正を行っていないため、所望の音圧より低い音圧、或いは逆に高い音圧を出力することになり、出力音圧が安定しなかったが、この発明のように外気温度情報を用いて駆動用出力電流のＤＵＴＹ比を補正することにより、常に一定且つ所望の出力音圧を得ることができる。   Conventionally, since the control correction of the piezoelectric buzzer driving current with respect to the outside air temperature has not been performed, a sound pressure lower than the desired sound pressure, or conversely, a high sound pressure was output, and the output sound pressure was not stable. However, by correcting the DUTY ratio of the drive output current using the outside air temperature information as in the present invention, it is possible to always obtain a constant and desired output sound pressure.

通常、車両には、外気温度を検出してエンジン制御またはエアコン制御を行う装置、および車内ＬＡＮ通信回線を備えているから、車載用ブザー音圧制御装置の外気温度情報の取得には、上記装置の外気温度検出およびＬＡＮ回線による伝送がそのまま利用できる。このように、本実施の形態１における車載用ブザー音圧制御装置は最小限の部品で実現可能である。   Usually, a vehicle is provided with a device for detecting outside air temperature to perform engine control or air conditioning control, and an in-vehicle LAN communication line. Outside air temperature detection and transmission via a LAN line can be used as they are. Thus, the vehicle-mounted buzzer sound pressure control device according to the first embodiment can be realized with a minimum number of components.

実施の形態２．
図６はこの発明の実施の形態２を示す構成図である。この実施の形態では、補正制御・駆動部１にセンサー信号入力インターフェース６を設け、外気温センサー１４で検出した外気温度情報を直接読み込むことにより、エンジン制御装置或いはエアコン制御装置である機器制御部１０とＬＡＮ通信回線２０を省略して、上記実施の形態１と同様の作用を得ることができる。センサー信号入力インターフェース６以外の補正制御・駆動部１並びに圧電ブザー２の構成は実施の形態１と同じであるので、説明を省略する。 Embodiment 2. FIG.
FIG. 6 is a block diagram showing Embodiment 2 of the present invention. In this embodiment, a sensor signal input interface 6 is provided in the correction control / drive unit 1, and by directly reading the outside air temperature information detected by the outside air temperature sensor 14, the device control unit 10 that is an engine control device or an air conditioner control device. The LAN communication line 20 can be omitted, and the same operation as in the first embodiment can be obtained. Since the configurations of the correction control / drive unit 1 and the piezoelectric buzzer 2 other than the sensor signal input interface 6 are the same as those in the first embodiment, the description thereof is omitted.

この発明の実施形態１に係る車載用ブザー音圧制御装置の構成を示す図である。It is a figure which shows the structure of the vehicle-mounted buzzer sound pressure control apparatus which concerns on Embodiment 1 of this invention. 実施の形態１の圧電ブザーの駆動電流（駆動信号）を示す図である。FIG. 3 is a diagram illustrating a drive current (drive signal) of the piezoelectric buzzer according to the first embodiment. 各ＤＵＴＹ駆動信号における外気温度と音圧の関係を示すマップである。It is a map which shows the relationship between the external temperature and sound pressure in each DUTY drive signal. 各外気温度におけるＤＵＴＹ駆動信号と音圧の関係を示すマップである。It is a map which shows the relationship between the DUTY drive signal and sound pressure in each outdoor temperature. 実施の形態１の動作手順を示すフローチャートである。3 is a flowchart illustrating an operation procedure according to the first embodiment. この発明の実施の形態２に係る車載用ブザー音圧制御装置の構成を示す図である。It is a figure which shows the structure of the vehicle-mounted buzzer sound pressure control apparatus which concerns on Embodiment 2 of this invention.

符号の説明Explanation of symbols

１ 補正制御・駆動部、
２ 圧電ブザー、
３ ＣＰＵ、
４ 車載ＬＡＮ通信インターフェース、
５ 圧電ブザー駆動回路、
６ センサー信号入力インターフェース、
１０ 機器制御部、
１１ 車載ＬＡＮ通信インターフェース、
１２ ＣＰＵ、
１３ センサー信号入力インターフェース、
１４ 外気温センサー、
２０ ＬＡＮ通信回線、
３０ 音圧大時の圧電ブザーＤＵＴＹ駆動電流値、
３１ 音圧中時の圧電ブザーＤＵＴＹ駆動電流値、
３２ 音圧小時の圧電ブザーＤＵＴＹ駆動電流値。 1 Correction control / drive unit,
2 Piezoelectric buzzer,
3 CPU,
4 In-vehicle LAN communication interface,
5 Piezoelectric buzzer drive circuit,
6 Sensor signal input interface,
10 Device control unit,
11 In-vehicle LAN communication interface,
12 CPU,
13 Sensor signal input interface,
14 Outside air temperature sensor,
20 LAN communication line,
30 Piezoelectric buzzer DUTY drive current value at high sound pressure,
31 Piezoelectric buzzer DUTY drive current value during sound pressure,
32 Piezoelectric buzzer DUTY drive current value when sound pressure is low.

Claims (3)

車両に搭載された圧電ブザーと、この圧電ブザーの駆動信号をＰＷＭ制御することにより上記圧電ブザーの音圧レベルを変えると共に、外気温度に応じて上記駆動信号のデューティー比を補正し、上記音圧レベルを所望レベルに保つ補正制御・駆動部とを備えたことを特徴とする車載用ブザー音圧制御装置。   The sound pressure level of the piezoelectric buzzer is changed by PWM control of the piezoelectric buzzer mounted on the vehicle and the drive signal of the piezoelectric buzzer, and the duty ratio of the drive signal is corrected according to the outside air temperature. An in-vehicle buzzer sound pressure control device comprising a correction control / drive unit for maintaining a level at a desired level. 上記外気温度の情報は、車両に搭載された外気温センサーで検出した外気温度に応じて当該車両のエンジン制御またはエアコン制御を行う機器制御部から、車載ＬＡＮ通信回線を用いて取得するようにしたことを特徴とする請求項１に記載の車載用ブザー音圧制御装置。   The information on the outside air temperature is obtained from the device control unit that performs engine control or air conditioner control of the vehicle according to the outside air temperature detected by the outside air temperature sensor mounted on the vehicle, using the in-vehicle LAN communication line. The vehicle-mounted buzzer sound pressure control device according to claim 1. 上記外気温度の情報は、外気温センサーから上記補正制御・駆動部に直接入力するようにしたことを特徴とする請求項１に記載の車載用ブザー音圧制御装置。   The in-vehicle buzzer sound pressure control device according to claim 1, wherein the information on the outside air temperature is directly input to the correction control / drive unit from an outside air temperature sensor.
JP2007276022A 2007-10-24 2007-10-24 In-vehicle buzzer sound pressure controller Expired - Fee Related JP4468982B2 (en)

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