JPH078098U - Automotive engine sound device - Google Patents

Abstract

(57) [Abstract] [Purpose] The engine sound of the car is changed to a more attractive engine sound for the driver without changing the silencer, and the engine sound and exhaust sound outside the vehicle are at the original level. Engine sound converter that keeps. [Structure] A pulse proportional to the engine speed is taken out from an ignition coil of a vehicle and input to an FV converter by a monostable multivibrator to obtain a voltage fluctuation proportional to the engine speed. By controlling the engine sound generation circuit of the rotation speed sound control with this output, an audio signal output almost proportional to the accelerator control operated by the driver of the vehicle can be obtained. This audio signal is input to the built-in amplifier to operate the small speaker, or is input as it is to the in-vehicle car stereo amplifier.
Alternatively, a device configured to transmit and receive FM waves, and then receive and listen to the in-vehicle FM radio.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a pseudo engine sound generating device for automobiles.

[Prior art]

 There are various tuning methods to make the engine sound more attractive than before, but most of them relate to the change of the silencer, and the driver who changed the silencer felt that the engine sound quality was improved. However, in many cases, the exhaust noise scattered around was actually increased.

[Problems to be solved by the device]

 In order to make the engine sound more attractive to the driver in this way, the engine that is more attractive only to the driver and passengers in the car will not be scattered as a result. I solved it in such a way that I could hear the sound.

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and its purpose is to make the engine sound more attractive than the actual engine sound so that the driver can hear a more attractive engine sound. The driver listens to this synthesized sound on the in-vehicle FM radio by controlling the rotation of this electrically generated engine sound in proportion to the rotational speed of the engine that is actually generated and is actually rotating for running. I did it.

[Action]

 FIG. 1 shows an electronic circuit according to a first embodiment of the present invention. It is composed of a circuit with each function for each of the four blocks surrounded by the broken line shown in the figure. First, the broken line portion 1 is the power supply stabilizing circuit and the input pulse voltage limiter shaping circuit that are responsible for the entire circuit of the present invention. A is connected as a power input to the plus circuit of the car battery, and the power switch not shown in FIG. Put in this circuit. B is a pulse input terminal and is connected to the contact breaker side of the ignition coil. The C terminal is the ground of the entire circuit, which also serves as the negative terminal of the power supply, and is connected to the ground of the vehicle body. A circuit block 2 surrounded by a broken line is a monostable multivibrator circuit using a timer IC chip, which converts the pulse signal from the block 1 into a voltage change proportional to the input frequency. A circuit 4 surrounded by a broken line is an IC chip of an engine sound generating circuit and controls the engine speed sound by the voltage fluctuation of the output line F from the block 2 and outputs it to the terminal D. The terminal D is already an audio signal of a pseudo engine sound proportional to the engine speed controlled by the driver. If it is directly connected to the input of the in-vehicle audio amplifier, the function of the present invention will be established, but this connection work is omitted. Therefore, the weak FM radio wave transmission circuit of the circuit 3 surrounded by the broken line converts it into an FM wave, and then receives and listens to the in-vehicle radio.

【Example】

 An embodiment of the present invention will be described with reference to FIG. Terminals A, B, and C are provided in one part surrounded by a broken line. Terminal A is connected to the battery plus circuit of the car, but blocks 2, 3, 4 via the Zener diode stabilized power supply circuit to suppress voltage fluctuations. Is supplied to the circuit. Terminal B is the pulse signal input terminal from the contact breaker side of the ignition coil to this circuit. After the pulse voltage is limited by the Zener diode via the integrator circuit, it is passed through the differentiation circuit and the monostable multivibrator by the timer IC of block 2 is used. It is input to the letter circuit. In this circuit, a voltage change signal proportional to the change of the pulse input frequency coming from the ignition coil is output to F. Therefore, this signal controls the engine sound generation IC of block 4 to output the fluctuation sound signal of the engine speed D Get in part. Since the audio signal of the engine sound by the synthesis which is almost proportional to the accelerator control of the driver is already output to this part, the function of the present invention can be obtained by connecting it to the in-vehicle radio cassette player or the amplifier input circuit for CD. Most of the in-vehicle devices satisfy the requirements, but most of them do not have an audio input specially, and even if they are equipped, it is difficult for an amateur to connect easily, so it is FM transmission to the block 3 part. Equipped with parts. Oscillation and modulation are performed by the first-stage transistor circuit, and the oscillation frequency is adjusted by C 1 inserted in parallel with the coil of the collector circuit. Find an available frequency of the in-vehicle FM radio and adjust C1 to that frequency. The final stage transistor also has a resonance coil at the transmission frequency as a buffer circuit. The radio wave output transmitted from this circuit is extremely weak, and it is useless by guiding it from the FM radio wave output terminal of block 3 and E to the vicinity of the on-vehicle FM radio receiving antenna with a coaxial cable and placing a short transmitting antenna at a close range. Try to suppress the emission of radio waves. Note that R1 of block 2 adjusts the idling speed of the engine based on the synthesized sound, and R2 of block 4 adjusts the speed limit and the maximum speed limit that are suitable for normal running. The S1 switch is a switch that allows switching between the sound of a V12 cylinder engine on the closed side and the sound of a V8 cylinder engine on the open side. The unit size in Fig. 1 can be combined into about 10 cigarette boxes in Fig. 3. 2 and 4 have an amplifier circuit 5 and a small speaker SP incorporated therein. If the D portion is input to the amplifier, the FM transmission portion of the block 3 in FIG. It will be possible.

[Effect of device]

 As described above, the present invention changes the engine sound of a 3- to 4-cylinder engine of a small utility vehicle or a small displacement light vehicle into a 12-cylinder sound of a sports car Ferrari or an American V8-cylinder sound of a big bore. Any engine sound can be obtained by replacing the internal sound generator chip. The engine sound of a car is a big attraction for car lovers.The present invention devises a device that allows you to drive while listening to the engine rotation of a high-priced foreign-made sports car with the engine rotation of your own utility car. Is provided at a low price.

[Brief description of drawings]

FIG. 1 is an electronic circuit of a first embodiment of the present invention.

FIG. 2 is an electronic circuit FM transmitter circuit amplifier according to the first embodiment of the present invention, with an SP.

FIG. 3 is an external perspective view of the electronic circuit of the first embodiment of the present invention, FIG.

FIG. 4 is an external perspective view of the electronic circuit of the first embodiment of the present invention, FIG.

[Explanation of symbols]

Figure 1 1 Stabilized power supply circuit and input pulse limiter shaping circuit. 2 Monostable multivibrator (FV converter) circuit. 3 FM wave transmission circuit. 4 Engine sound generation circuit. 5 amplifier, SP circuit. A In-vehicle battery plus circuit connection terminal. B Ignition coil breaker Point side connection terminal. C Ground for the entire circuit and in-vehicle battery minus circuit connection terminal. D Engine sound fluctuation rotation speed audio signal output terminal. E FM wave transmission antenna connection terminal. F Voltage fluctuation point (F-V
Combatter output). SP Small speaker. PS power switch. C1 FM wave frequency adjustment capacitor. R1 Synthetic sound Idling speed adjustment resistor. R2 Resistor for running and maximum speed adjustment. R3 amplifier, SP circuit volume control resistor. S1 engine sound selection switch.

Claims (1)

[Scope of utility model registration request] 1. A pseudo engine sound constructed so that an electric pulse signal generated in an ignition coil for a spark plug of an automobile engine is taken out, and a rotational speed sound of the pseudo engine sound is also changed in proportion to an input frequency due to the electric pulse. By providing an audio signal generating circuit and inputting the electric pulse signal to this circuit, a pseudo engine sound audio signal controlled in proportion to the throttle operation of the vehicle driver can be obtained, and this signal is used as an FM wave. A series of in-vehicle devices configured to transmit and receive on-vehicle car radio.