JPH0736504U - Pseudo engine sound generator - Google Patents

Pseudo engine sound generator

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Publication number
JPH0736504U
JPH0736504U JP6961693U JP6961693U JPH0736504U JP H0736504 U JPH0736504 U JP H0736504U JP 6961693 U JP6961693 U JP 6961693U JP 6961693 U JP6961693 U JP 6961693U JP H0736504 U JPH0736504 U JP H0736504U
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Prior art keywords
vehicle speed
sound
vehicle
signal
state
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JP6961693U
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Japanese (ja)
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俊之 天笠
知行 小川
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株式会社三ツ葉電機製作所
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Priority to JP6961693U priority Critical patent/JPH0736504U/en
Publication of JPH0736504U publication Critical patent/JPH0736504U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7258Optimisation of vehicle performance

Abstract

(57)【要約】 【目的】 電気自動車の種々の運転状態に応じた好適な疑似エンジン音を発生する。 (57) Abstract: generating a suitable pseudo engine sound in accordance with various operating conditions of the Objective electric vehicle. 【構成】 駆動用モータを回転可能にするためのイグニッションスイッチIGの信号と、車速センサ1からの車速パルス信号とを制御回路2に入力し、イグニッションスイッチIGのオン状態で、車両の停止状態(車速パルスの入力が無し)の時には0.5Hzの電子チャイム音をスピーカ10から発生し、走行状態(車速パルスの入力が有り)の時には車速パルスの周波数に応じて0.5〜 [Configuration] Type signal of an ignition switch IG for enabling rotation of the drive motor, and a speed pulse signal from the vehicle speed sensor 1 to the control circuit 2, in the on state of the ignition switch IG, the vehicle in the stopped state ( when the vehicle speed without input pulse) generates an electronic chime of 0.5Hz from the speaker 10, 0.5 in accordance with the frequency of the vehicle speed pulse when the running state (the input of the vehicle speed pulse is present)
max Hz(任意の最大周波数)の電子チャイム音をスピーカ10から発生する。 The F max Hz electronic chime sounds (any maximum frequency) generated from the speaker 10. 【効果】 アイドリング状態や走行時のエンジン回転数の大きさに応じた疑似エンジン音にて車両の状態を、運転者や歩行者に好適に知らせることができる。 EFFECT engine speed during idling and traveling states of the vehicle in a pseudo engine sound in accordance with the magnitude, it is possible to suitably inform the driver and pedestrians.

Description

【考案の詳細な説明】 Description of the invention]

【0001】 [0001]

【産業上の利用分野】 BACKGROUND OF THE INVENTION

本考案は、電気自動車に於ける疑似エンジン音を発生するための疑似エンジン 音発生装置に関する。 This invention relates to a pseudo engine sound generation apparatus for generating in a pseudo engine sound to an electric vehicle.

【0002】 [0002]

【従来の技術】 BACKGROUND OF THE INVENTION

動力に電動モータを用いた電気自動車にあっては、内燃機関を用いた自動車に 比べて振動が少なく、エンジン音も静かであるという利点がある。 In the electric vehicle using an electric motor to power, little vibration as compared to vehicle with an internal combustion engine, there is an advantage that the engine sound is also quiet. また、このよ うな電気自動車にあっては、内燃機関を用いた自動車に於けるスロットル操作と 同様のスロットル操作を行って、運転者の意志に基づいた運転を行うようにした ものがある。 Also, in this good Una electric vehicle, by performing a car same throttle operation and in the throttle operation using the internal combustion engine, there is that to perform the operation based on the intention of the driver.

【0003】 上記したように電気自動車にあってはモータ(エンジン)音が静かであること から、走行可能な状態(イグニッションスイッチのオン状態)であるのか、走行 時のモータの回転がどのような状態になっているのか等、従来の内燃機関の自動 車に於けるエンジン音による判断ができないという問題があった。 [0003] Since In the electric vehicle as described above is quiet motor (engine) sound, whether it is a state capable of running (ignition switch on), what is the rotation of the motor during running the or the like in the state, there is a problem that can not be judged by in the engine sound to the vehicles of the conventional internal combustion engine. また、歩行者 などに対して注意を促す必要があり、従来の電気自動車に於いて走行中であるこ とを知らせるための音を発するようにしたものがあった。 In addition, there is a need call attention to, such as a pedestrian, was something that was to emit a sound to inform that it is a traveling In the conventional electric car.

【0004】 上記の音を発するようにしたものとしては、イグニッションのオン状態と同様 の状態で、ある程度の音圧(周波数)レベルの音を発生させ、走行可能な状態で あることを認識させるようにしたものがある。 [0004] As those to emit the sounds, in the same state as an ignition ON state, so as to recognize that it is to generate the sound of some sound pressure (frequency) level, a state capable of running there are things you. しかしながら、従来の電気自動車 では、停止時や走行時でも一定の音圧(周波数)の音を発生させるものであり、 停止や車速の高低状態を含めた走行状態に対して不自然であるという問題があっ た。 However, in the conventional electric vehicle, which generates a sound of a certain sound pressure (frequency) even at a standstill and during running, that it is unnatural to the running conditions including high and low states of the stop and the vehicle speed problems was there.

【0005】 [0005]

【考案が解決しようとする課題】 [Challenges devised to be Solved]

このような従来技術の問題点に鑑み、本考案の主な目的は、電気自動車の種々 の運転状態に応じた好適な疑似エンジン音を発生し得る疑似エンジン音発生装置 を提供することにある。 In view of such problems of the prior art, a primary object of the present invention is to provide a pseudo engine sound generation apparatus capable of generating a suitable pseudo engine sound in accordance with various operating conditions of the electric vehicle.

【0006】 [0006]

【課題を解決するための手段】 In order to solve the problems]

このような目的は、本考案によれば、電気自動車の駆動用モータを回転可能に するための準備スイッチと、車速を検出するための車速検出手段と、発音体と、 前記発音体から疑似エンジン音を発生させるための発音体駆動制御手段とを有す る疑似エンジン音発生装置であって、前記発音体駆動制御手段が、前記準備スイ ッチにより前記モータの回転可能状態を検出した場合に於いて、前記車速検出手 段により前記電気自動車の停止状態を検出した場合には前記発音体から比較的小 さい音圧または低い周波数の音を発生させ、前記車速検出手段により前記電気自 動車の走行状態を検出した場合には車速の上昇に伴って前記音圧を増大しまたは 前記周波数を高めるように制御することを特徴とする疑似エンジン音発生装置を 提供することに Such object is achieved according to the present invention, a pseudo engine driving motor of an electric vehicle and preparation switch for enabling rotation, a vehicle speed detecting means for detecting a vehicle speed, and sounding body, from the sounding body a pseudo engine sound generation apparatus that have a a sounding body driving control means for generating a sound, when the sounding body driving control means detects the rotation state of the motor by the preparation switch in it, by generating the sound of relatively small again sound pressure or lower frequency from the sounding body when it detects the stop state of the electric vehicle by said vehicle speed detecting hand stage of the electric vehicles by the vehicle speed detecting means when detecting the running state to provide a pseudo engine sound generation apparatus and controls to enhance increased or the frequency the sound pressure with the increase of the vehicle speed り達成される。 Ri is achieved.

【0007】 [0007]

【作用】 [Action]

このようにすれば、従来の内燃機関エンジン車のアイドリング状態に相当する 状態を、モータの回転可能な状態であってかつ車両の停止状態であるという検出 により判別でき、そのアイドリング状態では比較的小さい音圧または低い周波数 の疑似音を発生し、車速に応じて音圧または周波数を変化させた音を発生するこ とにより、従来の自動車のエンジン音と同様に、運転状態に応じて変化する音を 発生することができる。 Thus, the state corresponding to the idling state of the conventional internal combustion engine powered vehicles, a rotatable state of the motor and can determine by detecting that a stopped state of the vehicle, relatively small in the idle state generating a pseudo-sound of the sound pressure or low frequencies, by a child generate sound with varying sound pressure or frequency according to the vehicle speed, as with the engine sound of a conventional automobile, the sound varies according to the operating conditions it can be generated.

【0008】 [0008]

【実施例】 【Example】

以下、本考案の好適実施例を添付の図面を参照して詳しく説明する。 DETAILED DESCRIPTION Hereinafter, preferred embodiments of the present invention in detail with reference to the accompanying drawings.

【0009】 図1は、本考案が適用された電気自動車(例えば電動2輪車)の疑似エンジン 音を発生するための回路全体を示す図である。 [0009] Figure 1 is a diagram showing an overall circuit for generating a pseudo engine sound of an electric vehicle to which the present invention is applied (e.g., an electric two-wheeled vehicle). 図1に於いて、例えば駆動用モー タMの回転数に応じて周波数が変化するパルスを発することにより車速を検出し 得る車速センサ1から発せられる車速パルス信号が、発音体駆動制御手段として の制御回路2内で分岐され、一方がF/V変換器3に入力し、他方が分周回路4 に入力するようになっている。 In FIG. 1, for example, a vehicle speed pulse signal sent from the vehicle speed sensor 1 capable of detecting vehicle speed by emitting pulses of varying frequency according to the rotational speed of the drive motor M is, as the sounding body driving control means It is branched in the control circuit 2, one input to the F / V converter 3 and the other is adapted to input to the frequency divider 4. このF/V変換器3は、本実施例では車速パルス 信号の発生を検出したらトランジスタオン信号を出力し、そのトランジスタオン 信号によりリレー駆動用トランジスタQ1をオンするようになっている。 The F / V converter 3 outputs a transistor ON signal when detecting the occurrence of a vehicle speed pulse signal in the present embodiment, it is adapted to turn on a relay driving transistor Q1 by the transistor ON signal.

【0010】 上記分周回路4は、車速パルス信号が発生したら例えば0.5Hzの信号を出力 し、車速パルス信号の増減に応じて0.5Hz〜F max (任意の最大周波数)の周 波数を増減させることができるものである。 [0010] The frequency dividing circuit 4, the vehicle speed pulse signal and outputs a signal of Once example 0.5Hz generating, the frequency of 0.5Hz~F max (arbitrary maximum frequency) in accordance with the increase or decrease of the vehicle speed pulse signal in which it can be increased or decreased. 分周回路4の上記出力信号は、前記 リレー駆動用トランジスタQ1により駆動されるリレーRL1の2位置選択式接 点の常時開側に出力されるようになっている。 The output signal of the frequency dividing circuit 4, and is outputted to the normally open side of the two-position selection formula Proximity relay RL1 which is driven by the relay driving transistor Q1. そのリレーRL1の2位置選択式 接点の常時閉側には、分周回路4と並列に設けられたアイドル音用発振回路5か らの例えば0.5Hzの発振信号が出力されるようになっている。 The normally closed side of the two-position selection formula contact of the relay RL1, so that the oscillation signal of, for example, 0.5Hz divider 4 and the idle sound oscillation circuit 5 or we provided in parallel is outputted there.

【0011】 上記モータMをモータ制御回路6を介して制御可能にする準備スイッチとして のイグニッションスイッチIGからのオン/オフ信号が、本制御回路2内の遅延 回路7に入力し、その遅延回路7の出力信号が、基準クロック発振回路8と第1 及び第2発振回路9・10に入力するようになっている。 [0011] ON / OFF signals from an ignition switch IG of the ready switch that allows controlling the motor M via a motor control circuit 6, and input to the delay circuit 7 of the present control circuit 2, the delay circuit 7 output signal of a reference clock oscillation circuit 8 is adapted to input to the first and second oscillator circuit 9.10. 基準クロック発振回路 8の出力信号はアイドル音用発振回路5と第1及び第2発振回路9・10に入力 するようになっている。 Reference clock output signal of the oscillation circuit 8 is adapted to input the oscillation circuit 5 for idle sound to the first and second oscillator circuit 9.10. 第1発振回路9は例えば2.0kHz(F1)の信号を出 力し、第2発振回路10は例えば1.6kHz(F2)の信号を出力するものであ る。 First oscillation circuit 9 Outputs signals for example 2.0 kHz (F1), a second oscillation circuit 10 is Ru der outputs a signal of, for example, 1.6 kHz (F2). そして、分周回路4とアイドル音用発振回路5とからリレーRY1の切換接 点を介して出力される信号と、前記第1及び第2発振回路9・10から出力され る各信号とが、チャイム音生成回路11に入力するようになっている。 Then, a signal outputted from the frequency divider 4 and the idle sound oscillation circuit 5 which via the switching contact of the relay RY1, and the signal that is output from the first and second oscillator circuit 9, 10, It is adapted to input to the chime sound generating circuit 11.

【0012】 また、発音体としてのスピーカ12は、電源側のトランジスタQ2と接地側の トランジスタQ3とが共にオン状態になったら発音するように接続されている。 Further, the speaker 12 as a sound body, a power source side of the transistors Q2 and Q3 of the ground side is connected to announce Once turned both turned on. 上記トランジスタQ2は、前記チャイム音生成回路11の出力段のオア回路OR 1の出力信号によりオン状態になるトランジスタQ4がオンした時にオンし、ト ランジスタQ3は、チャイム音生成回路11の出力段の互いに並列な両アンド回 路AD1・AD2の出力信号によりオンするようになっている。 The transistor Q2 is turned on when the transistor Q4 which turns on by the output signal of the OR circuit OR 1 of the output stage of the chime generator circuit 11 is turned on, DOO transistor Q3 is the output stage of the chime sound generating circuit 11 is adapted to turn on by the parallel output signals of both aND circuits AD1 · AD2 each other.

【0013】 上記オア回路OR1の入力段には、前記分周回路4またはアイドル音用発振回 路5の出力信号の立ち上がり・立ち下がりのタイミング毎に、立ち上がりその後 漸減する波形の信号を形成するCR時定数回路が設けられている。 [0013] The input stage of the OR circuit OR1 is in the divider circuit 4 or every timing of rise and fall of the output signal of the idle-sound oscillation circuit 5, CR to form a signal having a waveform which gradually decreases thereafter rising the time constant circuit is provided. 従って、トラ ンジスタQ2の出力は、図2に示されるように連続的に、立ち上がった後漸減す る波形となる。 Thus, the output of the tiger Njisuta Q2 are continuously, as shown in FIG. 2, a waveform you gradually decreased after rises.

【0014】 また、分周回路4またはアイドル音用発振回路5の出力信号は、上記両アンド 回路AD1・AD2にも入力しており、上記立ち上がり・立ち下がりのタイミン グで2.0kHzの信号と1.6kHzの信号とがトランジスタQ3に出力されること になる。 Further, the output signal of the frequency divider 4 or idle sound oscillation circuit 5 is also input to the two AND circuits AD1-AD2, 2.0 kHz signal at timing of the rise and fall and 1.6kHz signal and is to be outputted to the transistor Q3 of. 従って、トランジスタQ3の出力には、図2に示されるように2.0kH zの信号と1.6kHzの信号とが交互に生じる。 Therefore, the output of the transistor Q3 occurs alternately with the signal of the signal and 1.6kHz of 2.0KH z as shown in Figure 2.

【0015】 このようにして構成された疑似エンジン音発生回路の信号発音要領を以下に示 す。 [0015] shows the signal sound manner in this way the pseudo engine sound generation circuit constructed as follows. まず、内燃機関エンジン車のエンジンスタートと同様にイグニッションスイ ッチIGをオンにすると、遅延回路7を介すことにより0.2s後に、アイドル 音用発振回路5からの0.5Hz信号が出力されると共に、第1及び第2発振回路 9・10からそれぞれの周波数F1・F2の信号が出力される。 First, turning on Similarly ignition switch IG and the engine start of the internal combustion engine powered vehicles, after 0.2s by interposing a delay circuit 7, 0.5 Hz signal from the idle sound oscillation circuit 5 is outputted Rutotomoni, each signal of a frequency F1, F2 from the first and second oscillator circuit 9, 10 is output. なお、発進前の 停止状態(内燃機関エンジン車のアイドリング状態に相当する)では、車速セン サ1から車速パルス信号が発生されていないことからリレーRL1が非励磁状態 であるため、アイドル音用発振回路5からの0.5Hz信号がチャイム音生成回路 11に入力する。 Since the state of the pre-stop start (corresponding to the idling state of the internal combustion engine vehicles), the relay RL1 since the vehicle speed pulse signal from the vehicle speed sensor 1 is not generated is non-energized state, the oscillation idle sound 0.5Hz signal from circuit 5 are input to the chime sound generating circuit 11. 従って、この0.5Hz信号のタイミングにて、疑似エンジン音 として2.0kHzの信号と1.6kHzの信号とが切替わる(図2参照)電子チャイ ム音がスピーカ12から発音されるため、運転者及び歩行者などは、車両がアイ ドル状態であることを認識することができる。 Therefore, at the timing of this 0.5Hz signal, since a pseudo engine sound and 2.0kHz signal and 1.6kHz signal is switched as (see FIG. 2) electron Chai beam sound is sounded from the speaker 12, the operation such person and the pedestrian can recognize that the vehicle is in idle.

【0016】 次に、スロットルを操作して車両を発進させて車速パルスが生じると、トラン ジスタQ1がオンし、リレーLR1が切替わるため、分周回路4の信号がチャイ ム音生成回路11に入力するようになる。 [0016] Next, when the vehicle speed pulse by starting the vehicle by operating the throttle occurs, Trang register Q1 is turned on, since the relay LR1 is switched, the signal of the frequency divider 4 is Chai arm sound generating circuit 11 I would like to enter. そして、車速の上昇に伴って、分周回 路4の信号の周波数が高まり、図2に示されるようにトランジスタQ2・Q3の 周期が0.5Hzより短くなっていくため、2.0kHz(F1)の信号と1.6kHz (F2)の信号との切替わりが車速に応じて早まる。 Since the with an increase in vehicle speed, increasing the frequency of the frequency divider 4 of the signal, the period of the transistor Q2 · Q3 as shown in FIG. 2 becomes shorter than 0.5 Hz, 2.0 kHz (F1) switching spite of the signal and the signal of 1.6 kHz (F2) of earlier according to the vehicle speed. 従って、車速に応じて変化 する周期にて2.0kHzの信号と1.6kHzの信号とが切替わるチャイム音が発生 するため、運転者は、車速に応じて変化するチャイム音を認識しつつ運転するこ とができる。 Therefore, since the chime sound in cycles that vary according to the vehicle speed and the signal of the signal and 1.6kHz of 2.0kHz switched occurs, the driver, while recognizing the chime which changes according to the vehicle speed operation can do. また、歩行者なども、近づいてくる車両の速度を音によりある程度 判別可能である。 Also, such as a pedestrian, it is possible to some extent determined by the sound the speed of the approaching vehicle.

【0017】 なお、本実施例ではチャイム音を、その周波数を変化させるようにしたが、周 波数変化に限るものではなく、例えば音圧を変化させるようにしても良い。 [0017] Incidentally, a chime sound in the present embodiment, although so as to change its frequency, not limited to the frequency change, may be changed, for example, sound pressure.

【0018】 また、本考案に係る疑似エンジン音発生装置としては、本実施例に限定されず 、例えば、イグニッションスイッチIGのオン状態で比較的小さい音を発するス ピーカやホーンなどの発音体をイグニッションスイッチIGに接続すると共に、 車速に連動して周期の変化する音を発生させるべく、モータまたは車軸に回転体 を連結して回転体の回転に伴って発音体をたたく機構にしても良い。 Further, as the pseudo engine sound generation apparatus according to the present invention is not limited to this embodiment, for example, the ignition of the sounding body such as a speaker or horn for emitting relatively small sound ON state of the ignition switch IG while connected to the switch IG, so as to generate a sound that varies in period in conjunction with the vehicle speed, it may be mechanisms striking the sounding body with the rotation of the rotary member by connecting the rotator motor or axle. また、マイ クロコンピュータなどを用いて、車速入力信号に応じて発音体の発する音の周期 や音圧を変化させるようにプログラムを作成して、制御するようにしても良い。 Further, by using a micro computer, to create a program to vary the period and the sound pressure of the sound emitted by the sounding body according to the vehicle speed input signal may be controlled.

【0019】 [0019]

【考案の効果】 Effects of the invention]

このように本考案によれば、電気自動車に於いて、内燃機関エンジン車のアイ ドリング時に相当する疑似音や、車速の高低に応じて変化する疑似音を発生させ ることにより、内燃機関エンジン車のエンジン音に相当する音の変化を得ること ができ、内燃機関エンジン車から電気自動車に乗り換えても、何等不都合を生じ ることなく運転を行うことができると共に、歩行者などに対しても車両の状態を 的確に知らせることができる。 According to the present invention, in the electric vehicle, and a pseudo noise corresponding to the time of idling of the internal combustion engine vehicles, the Rukoto to generate a pseudo-sound that varies according to the level of the vehicle speed, the internal combustion engine vehicles can be obtained a change of the sound corresponding to the engine sound, even transfer to the electric vehicle from an internal combustion engine vehicle, it is possible to perform Rukoto without operation cause any way inconvenience the vehicle even for pedestrian it can be informed of the state accurately.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本考案が適用された電気自動車の疑似エンジン音発生回路全体を示す図。 [1] The present invention exhibits an overall pseudo engine sound generation circuit of the applied electric vehicle FIG.

【図2】疑似エンジン音の発生要領を示すタイムチャート。 FIG. 2 is a time chart showing the generation procedure of the pseudo engine sound.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 車速センサ 2 制御回路 3 F/V変換器 4 分周回路 5 アイドル音用発振回路 6 モータ制御回路 7 遅延回路 8 基準クロック発振回路 9 第1発振回路 10 第2発振回路 11 チャイム音生成回路 12 スピーカ 1 a vehicle speed sensor 2 control circuit 3 F / V converters 4 frequency divider 5 idle sound oscillation circuit 6 motor control circuit 7 a delay circuit 8 the reference clock oscillation circuit 9 first oscillation circuit 10 and the second oscillation circuit 11 chime generator 12 speaker

Claims (1)

    【実用新案登録請求の範囲】 [Range of utility model registration request]
  1. 【請求項1】 電気自動車の駆動用モータを回転可能にするための準備スイッチと、車速を検出するための車速検出手段と、発音体と、前記発音体から疑似エンジン音を発生させるための発音体駆動制御手段とを有する疑似エンジン音発生装置であって、 前記発音体駆動制御手段が、前記準備スイッチにより前記モータの回転可能状態を検出した場合に於いて、前記車速検出手段により前記電気自動車の停止状態を検出した場合には前記発音体から比較的小さい音圧または低い周波数の音を発生させ、前記車速検出手段により前記電気自動車の走行状態を検出した場合には車速の上昇に伴って前記音圧を増大しまたは前記周波数を高めるように制御することを特徴とする疑似エンジン音発生装置。 1. A and preparation switch for enabling rotation of the driving motor of an electric vehicle, a vehicle speed detecting means for detecting a vehicle speed, and the sounding body, pronunciation for generating a pseudo engine sound from the sounding body a pseudo engine sound generation apparatus and a body drive control device, the sounding body driving control means, in the case of detecting the rotation state of the motor by the preparation switch, the electric vehicle by said vehicle speed detecting means of when detecting the stop state to generate the sound of relatively small sound pressure or lower frequency from the sounding body, when detecting a traveling state of the electric vehicle by said vehicle speed detecting means with the increase of the vehicle speed pseudo engine sound generation apparatus and controls to enhance increased or the frequency the sound pressure.
JP6961693U 1993-11-30 1993-11-30 Pseudo engine sound generator Pending JPH0736504U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6961693U JPH0736504U (en) 1993-11-30 1993-11-30 Pseudo engine sound generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6961693U JPH0736504U (en) 1993-11-30 1993-11-30 Pseudo engine sound generator

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JPH0736504U true JPH0736504U (en) 1995-07-04

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JP6961693U Pending JPH0736504U (en) 1993-11-30 1993-11-30 Pseudo engine sound generator

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