JPH0736504U - Pseudo engine sound generator - Google Patents

Abstract

(57) [Abstract] [Purpose] Generates a suitable pseudo engine sound according to various driving states of an electric vehicle. [Structure] A signal from an ignition switch IG for allowing a drive motor to rotate and a vehicle speed pulse signal from a vehicle speed sensor 1 are input to a control circuit 2, and the vehicle is stopped when an ignition switch IG is turned on ( When the vehicle speed pulse is not input), an electronic chime sound of 0.5 Hz is generated from the speaker 10, and when the vehicle is running (when the vehicle speed pulse is input), 0.5 to 0.5 depending on the frequency of the vehicle speed pulse.
An electronic chime sound of F _max Hz (arbitrary maximum frequency) is generated from the speaker 10. [Effect] It is possible to suitably inform the driver and the pedestrian of the vehicle state by a pseudo engine sound according to the idling state and the magnitude of the engine speed during traveling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pseudo engine sound generator for generating a pseudo engine sound in an electric vehicle.

[0002]

[Prior art]

 An electric vehicle that uses an electric motor as power has the advantages of less vibration and quieter engine sound than a vehicle that uses an internal combustion engine. Also, in such an electric vehicle, there is a vehicle in which a throttle operation similar to the throttle operation in a vehicle using an internal combustion engine is performed to perform driving based on a driver's intention.

As described above, in an electric vehicle, the noise of the motor (engine) is quiet. Therefore, whether the vehicle can be driven (the ignition switch is in the ON state) or the rotation of the motor during traveling is There was a problem that it could not be judged by the engine sound in a conventional internal combustion engine vehicle, such as whether it is in a state. In addition, it was necessary to call attention to pedestrians and others, and in some conventional electric vehicles, a sound was emitted to inform that the vehicle was running.

The above-mentioned sound is generated so that a sound with a certain sound pressure (frequency) level is generated in the same state as when the ignition is turned on so that it is possible to recognize that the vehicle is capable of running. There is something I did. However, conventional electric vehicles generate sound with a constant sound pressure (frequency) even when the vehicle is stopped or running, which is unnatural for running conditions including stop and high / low vehicle speed. was there.

[0005]

[Problems to be solved by the device]

 In view of such problems of the conventional art, a main object of the present invention is to provide a pseudo engine sound generating device capable of generating a suitable pseudo engine sound according to various driving states of an electric vehicle.

[0006]

[Means for Solving the Problems]

 According to the present invention, such a purpose is to provide a preparatory switch for rotating a drive motor of an electric vehicle, a vehicle speed detecting means for detecting a vehicle speed, a sounding body, and a pseudo engine from the sounding body. A pseudo engine sound generation device having a sounding body drive control means for generating a sound, wherein the sounding body drive control means detects a rotatable state of the motor by the preparation switch. When the vehicle speed detection means detects the stop state of the electric vehicle, the sounding body generates a sound of a relatively low sound pressure or a low frequency, and the vehicle speed detection means generates a sound of the electric vehicle. (EN) Provided is a pseudo engine sound generating device characterized in that, when a running state is detected, the sound pressure is controlled to be increased or the frequency is increased with an increase in vehicle speed. Ri is achieved.

[0007]

[Action]

 By doing so, the state corresponding to the idling state of the conventional internal combustion engine engine vehicle can be determined by detecting that the motor is rotatable and the vehicle is stopped, and the idling state is relatively small. Sound pressure or low-frequency pseudo-sound is generated, and sound that changes sound pressure or frequency according to vehicle speed is generated. Can occur.

[0008]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing an entire circuit for generating a pseudo engine sound of an electric vehicle (for example, an electric motorcycle) to which the present invention is applied. In FIG. 1, for example, a vehicle speed pulse signal issued from a vehicle speed sensor 1 capable of detecting a vehicle speed by emitting a pulse whose frequency changes in accordance with the number of revolutions of the driving motor M serves as a sounding body drive control means. The control circuit 2 is branched, one of which is input to the F / V converter 3 and the other of which is input to the frequency dividing circuit 4. In this embodiment, the F / V converter 3 outputs a transistor ON signal when detecting the generation of the vehicle speed pulse signal, and turns ON the relay driving transistor Q1 by the transistor ON signal.

When the vehicle speed pulse signal is generated, the frequency dividing circuit 4 outputs a signal of, for example, 0.5 Hz, and the frequency of 0.5 Hz to F _max (arbitrary maximum frequency) is changed according to the increase or decrease of the vehicle speed pulse signal. It can be increased or decreased. The output signal of the frequency dividing circuit 4 is output to the normally open side of the two-position selection type contact point of the relay RL1 driven by the relay driving transistor Q1. On the normally closed side of the 2-position selection type contact of the relay RL1, an oscillation signal of, for example, 0.5 Hz is output from the idle sound oscillation circuit 5 provided in parallel with the frequency dividing circuit 4. There is.

An on / off signal from an ignition switch IG as a preparation switch that enables control of the motor M via a motor control circuit 6 is input to a delay circuit 7 in the control circuit 2 and the delay circuit 7 The output signal of is input to the reference clock oscillation circuit 8 and the first and second oscillation circuits 9 and 10. The output signal of the reference clock oscillation circuit 8 is input to the idle tone oscillation circuit 5 and the first and second oscillation circuits 9 and 10. The first oscillating circuit 9 outputs a signal of 2.0 kHz (F1), for example, and the second oscillating circuit 10 outputs a signal of 1.6 kHz (F2), for example. Then, the signal output from the frequency dividing circuit 4 and the idle sound oscillation circuit 5 through the switching contact of the relay RY1 and the signals output from the first and second oscillation circuits 9 and 10 are It is adapted to be input to the chime sound generation circuit 11.

Further, the speaker 12 as a sounding body is connected so as to sound when both the power supply side transistor Q2 and the ground side transistor Q3 are turned on. The transistor Q2 is turned on when the transistor Q4 which is turned on by the output signal of the OR circuit OR1 of the output stage of the chime sound generation circuit 11 is turned on, and the transistor Q3 is connected to the output stage of the chime sound generation circuit 11 by the transistor Q3. It is turned on by the output signals of both AND circuits AD1 and AD2 which are parallel to each other.

At the input stage of the OR circuit OR1, a CR which forms a signal having a waveform that rises and then gradually decreases at each rising / falling timing of the output signal of the frequency dividing circuit 4 or the idle sound oscillating circuit 5 is formed. A time constant circuit is provided. Therefore, the output of the transistor Q2 has a waveform which continuously rises and then gradually decreases as shown in FIG.

Further, the output signal of the frequency dividing circuit 4 or the idle sound oscillating circuit 5 is also input to both the AND circuits AD1 and AD2, and becomes a 2.0 kHz signal at the rising and falling timings. The 1.6 kHz signal is output to the transistor Q3. Therefore, at the output of the transistor Q3, a 2.0 kHz signal and a 1.6 kHz signal are alternately generated as shown in FIG.

The signal sound generation procedure of the pseudo engine sound generating circuit configured as described above is shown below. First, when the ignition switch IG is turned on in the same way as the engine start of an internal combustion engine car, the 0.5 Hz signal from the idle sound oscillation circuit 5 is output 0.2 seconds after the delay circuit 7 is passed. At the same time, signals of respective frequencies F1 and F2 are output from the first and second oscillating circuits 9 and 10. When the vehicle is stopped before starting (corresponding to the idling state of an internal combustion engine engine vehicle), the vehicle speed sensor 1 does not generate a vehicle speed pulse signal, so the relay RL1 is in the non-excited state, so the idle sound oscillation is generated. The 0.5 Hz signal from the circuit 5 is input to the chime sound generation circuit 11. Therefore, at the timing of the 0.5 Hz signal, the pseudo engine sound is switched between the 2.0 kHz signal and the 1.6 kHz signal (see FIG. 2). People and pedestrians can recognize that the vehicle is in an idle state.

Next, when the vehicle is started by operating the throttle to generate a vehicle speed pulse, the transistor Q1 is turned on and the relay LR1 is switched, so that the signal of the frequency dividing circuit 4 is transmitted to the chime sound generating circuit 11. I will enter. Then, as the vehicle speed increases, the frequency of the signal of the frequency dividing circuit 4 increases, and as shown in FIG. 2, the cycle of the transistors Q2 and Q3 becomes shorter than 0.5 Hz, so 2.0 kHz (F1) Switching between the signal of 1.6kHz and the signal of 1.6kHz (F2) becomes faster according to the vehicle speed. Therefore, a chime sound that switches between a 2.0 kHz signal and a 1.6 kHz signal is generated at a cycle that changes according to the vehicle speed, so that the driver recognizes the chime sound that changes according to the vehicle speed while driving. can do. In addition, pedestrians can also determine the speed of an approaching vehicle to some extent by sound.

Although the frequency of the chime sound is changed in the present embodiment, it is not limited to the frequency change, and the sound pressure may be changed, for example.

Further, the pseudo engine sound generating device according to the present invention is not limited to this embodiment. For example, a sounding body such as a speaker or a horn that emits a relatively small sound when the ignition switch IG is on is turned on. In addition to being connected to the switch IG, a rotating body may be connected to a motor or an axle so as to generate a sound whose period changes in association with the vehicle speed, and a mechanism for striking the sounding body as the rotating body rotates may be used. Alternatively, a program may be created using a micro computer or the like so as to change the cycle and sound pressure of the sound emitted by the sounding body in response to the vehicle speed input signal, and the program may be controlled.

[0019]

[Effect of device]

 As described above, according to the present invention, in an electric vehicle, a pseudo sound corresponding to idling of an internal combustion engine engine vehicle or a pseudo sound that changes depending on the vehicle speed is generated to generate an internal combustion engine engine vehicle. It is possible to obtain a change in sound that corresponds to the engine sound of the vehicle, and to operate without changing the internal combustion engine vehicle to an electric vehicle without causing any inconvenience. The state of can be accurately notified.

[Brief description of drawings]

FIG. 1 is a diagram showing an entire pseudo engine sound generation circuit of an electric vehicle to which the present invention is applied.

FIG. 2 is a time chart showing how to generate a pseudo engine sound.

[Explanation of symbols]

 1 vehicle speed sensor 2 control circuit 3 F / V converter 4 frequency divider circuit 5 idle sound oscillation circuit 6 motor control circuit 7 delay circuit 8 reference clock oscillation circuit 9 first oscillation circuit 10 second oscillation circuit 11 chime sound generation circuit 12 Speaker

Claims (1)

[Scope of utility model registration request] 1. A preparation switch for rotating a drive motor of an electric vehicle, a vehicle speed detecting means for detecting a vehicle speed, a sounding body, and a sound for producing a pseudo engine sound from the sounding body. A pseudo engine sound generating device having a body drive control means, wherein the sounding body drive control means detects the rotatable state of the motor by the preparation switch, and the electric vehicle by the vehicle speed detection means. When the stop state is detected, a relatively low sound pressure or a low frequency sound is generated from the sounding body, and when the running state of the electric vehicle is detected by the vehicle speed detecting means, the vehicle speed is increased. A pseudo engine sound generating device, which is controlled so as to increase the sound pressure or increase the frequency.