KR20140080317A - Virtual Engine Sound System for vehicle and method thereof - Google Patents

Abstract

According to an embodiment of the present invention, a device to generate a virtual engine sound includes: a fuel cell system which includes a fuel cell stack including a plurality of unit cells to supply electricity to a vehicle, a fuel supply unit to supply fuel to the fuel cell stack, an oxidizer supply unit to supply an oxidizer to the fuel cell stack, and a fuel supply amount detection unit to detect the supply amount of fuel supplied to the fuel cell stack; a pedestrian detection unit which detects the existence of a pedestrian around the vehicle; a control unit which receives detection signals from the pedestrian detection unit and the fuel supply amount detection unit and gives a control command; a sound source generation unit which, in response to the control command, generates a different sound source signal according to the existence of a pedestrian and the supply amount of fuel; and a sound output unit which outputs a certain sound according to the sound source signal from the sound source generation unit.

Description

Technical Field [0001] The present invention relates to a virtual engine sound generator,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a virtual engine sound generator, and more particularly, to a virtual engine sound generator for outputting a predetermined sound for detecting a pedestrian around a vehicle during driving and enabling a pedestrian to recognize the vehicle.

A car is a means of transporting passengers and cargo on the road by producing power from its own engine and delivering it to the wheels. A car can be divided into a body, which forms a large appearance, and a chassis, in which various devices are connected to each other. The chassis includes the main devices such as power transmission devices, steering devices, suspension devices, and braking devices, as well as automobile engines that are the driving force of driving.

The engine is the driving force that drives the car. Most automotive engines are four-stroke internal combustion engines. A four-stroke internal combustion engine is the most common example of a reciprocating engine with an internal combustion engine ending one cycle by four strokes of suction, compression, explosion, and exhaust. The internal combustion engine, which mainly uses volatile fuel, obtains the kinetic energy by directly using the heat energy generated when the fuel is mixed with the oxygen in the air to be completely burned and then burned.

Such internal combustion engines using volatile fuels have caused environmental pollution due to exhaust gas and depletion of petroleum resources.

BACKGROUND ART Electric vehicles (EVs) are mainly classified into battery-dedicated vehicles and hybrid vehicles, which are powered by an AC or DC motor and are powered by a battery. And the hybrid vehicle recharges when the power is exhausted. The hybrid vehicle operates the engine to generate electric power, charges the battery, and uses the electricity to drive the electric motor to move the vehicle.

In addition, the hybrid vehicle can be classified into a serial system and a parallel system. In the serial system, the mechanical energy output from the engine is converted into electrical energy through the generator, and the electrical energy is supplied to the battery or the motor. The concept of adding an engine and a generator to increase the mileage of an existing car in a car. The parallel method can move the car by battery power. The engine (gasoline or diesel) alone uses two power sources to drive the car. Depending on the driving conditions, the parallel system can drive the car at the same time as the engine and the motor.

However, in the EV driving mode of the environmentally friendly vehicle, that is, in the mode in which the vehicle travels by the power of the motor, the driving noise is very low and the vehicle is in a low noise state. Therefore, pedestrians (especially visually impaired persons) May occur.

To this end, a virtual engine sound system (VESS: Virtual Engine Sound System) is mounted on an environmentally friendly vehicle, which enables pedestrians to easily recognize the vehicle access state by outputting virtual noise to the outside of the vehicle through a speaker have.

These virtual engine sound system speakers are installed in the front bumper of the vehicle or in the engine room to generate virtual engine-like sounds or motor sounds.

However, recently, a car which is mainly manufactured in a small size has a very narrow engine room, which makes it difficult to install a large capacity speaker which generates sound in a low frequency band.

That is, the existing virtual engine sound system generates a virtual engine sound or other perceived sound through the outdoor speaker in the engine room so that the pedestrian can easily recognize the approaching state of the vehicle. However, since the engine room is narrow, There is a limitation in physically reproducing low frequency sounds.

In addition, there is a limitation in raising the volume of the playback so that the pedestrian can easily recognize the approach state of the vehicle, and the multi-speaker is used in consideration of the fact that the perceptibility is different according to the speaker mounting position. Because it is played back sound, it is different from the sound from the actual engine or motor, and the feeling of heterogeneity can be felt.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a virtual engine sound generator that generates different virtual engine sounds according to the presence or absence of a pedestrian or the acceleration of a vehicle.

According to an aspect of the present invention, there is provided a virtual engine noise generator comprising: a fuel cell stack including a plurality of unit cells for supplying electricity to a vehicle; A fuel supply unit for supplying fuel to the fuel cell stack; An oxidant supplier for supplying an oxidant to the fuel cell stack; And a fuel supply amount sensing unit for sensing a fuel supply amount supplied to the fuel cell stack. The pedestrian sensing unit senses a pedestrian around the vehicle. A control unit receiving a sensing signal of the pedestrian sensing unit and the fuel supply amount sensing unit and applying a control command thereto; A sound source generating unit for generating different sound source signals in accordance with the presence or absence of a pedestrian in response to the control command and generating different sound source signals according to the fuel supply amount; And an acoustic output unit for outputting a predetermined sound according to the sound source signal of the sound source generating unit.

According to the virtual engine sound generator of the present invention, one or more of the following effects can be obtained.

Since the sound corresponding to the acceleration of the vehicle is outputted, the warning effect given to the pedestrian is large, and the recognition of the vehicle of the pedestrian can be improved.

In addition, since there is a difference in the magnitude of sound generated according to the presence or absence of a pedestrian, there is an advantage in providing a driver with a quiet driving environment when a warning effect given to the pedestrian is large when the pedestrian exists, and the pedestrian does not exist. Further, even if the capacity of a speaker mounted on a vehicle is small, there is an advantage that a large sound is effectively generated by using a reinforcing and destructive interference phenomenon.

In addition, since a loud sound is generated when a pedestrian is detected around the lane, the driver has the advantage of being able to recognize the presence of a pedestrian.

1 is a perspective view schematically showing a configuration of a vehicle according to an embodiment of the present invention.
2 is a block diagram schematically showing a control configuration of a virtual engine sound generator according to an embodiment of the present invention.
3 is a block diagram schematically showing a control configuration of a fuel cell system according to an embodiment of the present invention.
4 is a view schematically showing the position of a sensor for detecting a pedestrian of a vehicle according to an embodiment of the present invention.
5 and 6 are exemplary diagrams showing examples of sound output of a car according to an embodiment of the present invention.
7 is a flowchart illustrating a control method of a virtual engine sound generator according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" Can be used to easily describe the correlation of components with other components. Spatially relative terms should be understood as terms that include different orientations of components during use or operation in addition to those shown in the drawings. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited component, step, and / or step does not exclude the presence or addition of one or more other elements, steps and / I never do that.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

In the drawings, the thickness and the size of each component are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size and area of each component do not entirely reflect actual size or area.

Further, the angles and directions mentioned in the description of the structure of the embodiment are based on those shown in the drawings. In the description of the structures constituting the embodiments in the specification, reference points and positional relationships with respect to angles are not explicitly referred to, reference is made to the relevant drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings for explaining an automobile according to embodiments of the present invention.

1 is a perspective view schematically showing a configuration of a vehicle according to an embodiment of the present invention.

1, a vehicle 1 is provided with a headlight 2, a turn signal lamp 3, and a vehicle bumper 4 on the front face of the vehicle, and includes a wheel 8 for rotating the vehicle when traveling, And a side mirror 9 provided so that the driver can recognize the left and right rear.

In addition, at the rear of the vehicle, there are provided a turn signal lamp 5 for allowing the other vehicle running behind the vehicle to confirm the running direction of the vehicle, a brake lamp 6 for notifying the vehicle when the vehicle is decelerating or stopping, and a bumper .

The automobile 1 also has a motor as a power source, and a battery for driving the motor is provided inside. In the case of a hybrid vehicle, a motor and a battery are provided as well as an engine is provided at the same time so that a driver can select a power source and run, and if the battery is exhausted, the power source is automatically changed do.

FIG. 2 is a block diagram schematically showing a control configuration of a virtual engine sound generator according to an embodiment of the present invention. FIG. 3 is a block diagram schematically showing a control configuration of a fuel cell system according to an embodiment of the present invention .

2, the virtual engine sound generator 100 includes a pedestrian sensing unit 180, a sound generator 170, a sound output unit 160, a data unit 120, a sensing unit 130, a display unit 140, an input unit 150, a fuel cell system 200, and a control unit 110 for controlling the entire vehicle driving and operation.

The fuel cell system 200 includes a fuel supply unit 210, a humidifying unit 220, an oxidizer supply unit 230, a supply amount adjustment unit 240, a fuel cell stack 250, a load 260, and a fuel supply amount sensing unit 241 ). A detailed description of the fuel cell system 200 will be described later.

The vehicle further includes a motor, a motor control unit for controlling the motor, an inverter unit for supplying operation power to the motor, a converter, a battery, and a battery management unit, but a description thereof will be omitted below.

The sensing unit 130 senses a signal generated during a vehicle running or a predetermined operation and inputs the sensed signal to the controller 110. The sensing unit 130 includes a plurality of sensors inside and outside the vehicle, and inputs various sensing signals. At this time, the type of the sensor may be different depending on the installed position.

Further, the sensing unit can measure the wavelength of the noise generated in the vehicle. The noise generated in the vehicle may be the friction sound of the tire and ground of the vehicle.

The input unit 150 includes a plurality of switch buttons and touch input means for inputting a predetermined signal by the operation of the driver. At this time, the input unit 150 includes a switch for turning on / off the detection of the pedestrian. When the pedestrian sensing key is turned on, the control unit 110 causes the pedestrian sensing unit 180 to operate.

The input unit 150 includes a plurality of switches, buttons, and the like for operation of a turn signal indicating lamp, a tail lamp, a head lamp, a brush, etc., along with the running of the vehicle. The input unit 150 includes operation means for operating such as a steering wheel, an accelerator, .

The display unit 140 displays the running state and information of the vehicle. In particular, the display unit 140 outputs a guidance indicating that a pedestrian exists around the vehicle when the pedestrian is sensed, according to a control command of the control unit 110. [ Also, the display unit 140 can display the position of the pedestrian based on the vehicle.

The sound output unit 160 outputs music, a sound effect, and a warning sound. At this time, the sound output unit 160 includes at least one speaker. At this time, the sound output unit 160 may be installed not only inside the vehicle but also outside the vehicle.

As the output means, the display unit 140 and the sound output unit 160 output at least one of a warning sound, a warning light, and a warning message in response to the occurrence of an abnormality as well as a vehicle status during driving.

The pedestrian sensing unit 180 includes a plurality of sensors, detects a pedestrian around the vehicle, and inputs a sensing signal to the controller 110. [ A plurality of sensors are installed on the front and rear of the vehicle to detect pedestrians located in the vicinity of the vehicle, the front, the side, and the rear of the vehicle.

At this time, the pedestrian sensing unit 180 can be operated according to the on / off setting of the pedestrian sensing key of the input unit 150. Even if the pedestrian sensing key is turned off in some cases, Can be detected.

The sound source generating unit 170 generates and converts a predetermined sound source according to a control command of the controller 110 and applies the generated sound source to the sound output unit 160 so that sound is output through the sound output unit 160.

The sound source generating unit 170 may cause a sound similar to the engine driving sound to be outputted or a sound having a specific melody to be output through the sound output unit 160. [ The sound source generating unit 170 may generate sounds having predetermined wavelengths, amplitudes, and phases.

The data section 120 stores control data for driving the vehicle, setting data according to the driver's use of the vehicle, or driving record.

The data unit 120 stores sound source data generated and converted by the sound source generating unit 170. The data unit 120 may store sound source samples used in the sound source generating unit 170 or separately recorded sound source data.

Referring to FIG. 3, the fuel cell system 200 includes a polymer electrolyte membrane fuel cell (hereinafter, referred to as " fuel cell ") that reforms fuel to generate hydrogen and electrochemically reacts hydrogen and oxygen to generate electric energy. ; PEMFC) method can be adopted.

However, the present invention is not limited thereto, and the fuel cell system 200 according to the present embodiment can use liquid or gaseous fuel containing hydrogen such as methanol, ethanol, LPG, LNG, gasoline, butane gas and the like. At this time, the fuel cell stack 250 according to the present invention may be configured as a direct oxidation fuel cell (Fuel Cell) method in which electric energy is generated through direct reaction of liquid or gaseous fuel and oxygen in a unit cell.

The fuel used in the fuel cell system 200 collectively refers to a hydrocarbon-based fuel such as methanol, ethanol or natural gas, LPG, etc., which is in a liquid or gaseous state. The fuel cell system 200 may use oxygen gas stored in a separate storage means as an oxidant reacting with hydrogen or air.

The fuel supply unit 210 supplies fuel to the fuel cell stack 250. The fuel supply unit 210 includes a fuel tank 212 and a fuel pump 214. The fuel tank 214 is connected to the fuel tank 212 and supplies the liquid fuel stored in the fuel tank 212 to the fuel tank 212 by a predetermined pumping force. .

The humidifying unit 220 includes a humidifier 222 and a moisture supplying unit 224. The humidifier 222 is connected to the fuel tank 212 and humidifies the liquid fuel discharged from the fuel tank 212. The humidifier 222 is controlled in humidification by the controller 110. The moisture supply unit 224 is connected to the humidifier 222 to supply moisture to the humidifier 222.

The oxidant supply unit 230 supplies the oxidant to the fuel cell stack 250. The oxidant supply part 230 includes an oxidant pump. The oxidant pump sucks the outside air with a predetermined pumping force.

The supply amount regulating portion 240 includes a fuel control valve 242 and an oxidant control valve 244. The fuel control valve 242 is installed between the humidifier 20 and the fuel cell stack 250 and supplies humidified fuel to the fuel cell stack 250. The degree of opening of the fuel control valve 242 is controlled by the control unit 110, so that the supply amount of the humidified fuel is adjusted.

An oxidant control valve 244 is provided between the oxidant supply part 230 and the fuel cell stack 250 and supplies the oxidant to the fuel cell stack 250. The degree of opening of the oxidizer control valve 244 is controlled by the control unit 110, and thus the supply amount of the oxidizer is regulated.

The fuel cell stack 250 includes a plurality of unit cells for generating electrical energy by inducing oxidation / reduction reactions of the fuel and the oxidant. One unit cell 252 of the plurality of unit cells includes a membrane electrode assembly (MEA) 252b for oxidizing / reducing oxygen in the fuel and an oxidant, and a membrane-electrode assembly 252b (Also referred to as a bipolar plate) separators 252a and 252c for supplying the separator. The structure of the unit cell 252 is a structure in which separators 252a and 252c are disposed on both sides of the membrane-electrode assembly 252b.

The membrane-electrode assembly 252b includes an electrolyte membrane disposed at the center, a cathode electrode disposed on one side of the electrolyte membrane, and an anode electrode disposed on the other side of the electrolyte membrane. An oxidant is supplied to the cathode electrode through the separators 252a and 252c, and fuel is supplied to the anode electrode. The fuel cell system 200 of the present invention includes the fuel cell stack 250 in which the unit cells 252 as described above are continuously arranged.

The load 260 is electrically connected to the (+) terminal and the (-) terminal of the fuel cell stack 250 and is operated by a power source supplied from the fuel cell stack 250. The load 260 can be implemented through various electric devices such as a motor of an automobile, an inverter for converting DC electricity into AC electricity, and an electric heating appliance for home use. Hereinafter, the load 260 is described as being a motor that supplies a driving force to the automobile.

The fuel supply amount sensing unit 241 senses a fuel supply amount supplied to the fuel cell stack 250 and inputs the amount of fuel supply to the control unit 110. [ The fuel supply amount sensing unit 241 may include various sensors such as a flow rate sensor and a flow rate sensor.

In addition, the oxidant supply amount sensing unit 243 may be provided if necessary.

2 and 3, the control unit 110 controls the vehicle to perform an operation corresponding to the inputs of the input unit 150 and the sensing unit 130, generates a predetermined command, And outputs the operation state of the vehicle through the display unit 140 and the sound output unit 160. [

 The control unit 110 applies a control command to the sound source output unit 170 in response to the sensing signal input through the pedestrian sensing unit 180. The sound source generating unit 170 generates a sound source sample Or separately modulates and converts sound source data recorded and stored, and applies the modulated and converted sound source data to the sound output unit 160. Accordingly, the sound output unit 160 outputs a specific sound.

When the pedestrian sensing key of the input unit 150 is turned on, the control unit 110 causes the pedestrian sensing unit 180 to operate to sense a pedestrian around the vehicle. However, when the pedestrian detection is required in some cases, for example, the control unit 110 enables the pedestrian detection regardless of the setting of the input unit when the vehicle is moving backward.

The control unit 110 may automatically detect the pedestrian sensing unit 180 regardless of the setting of the input unit 150 in the vicinity of the primary lane, the lane two-lane road, the child protection area, and the pedestrian crossing, .

The sound source generating unit 170 selectively applies the sound source to the sound output unit 160 installed inside the vehicle or outside the vehicle according to the control command of the controller 110 so that predetermined sounds are output only to the inside of the vehicle, And may be outputted simultaneously from the inside and the outside of the vehicle as occasion demands.

The control unit 110 controls the operations of the fuel supply unit 210, the humidification unit 220, and the supply amount adjustment unit 40 to supply necessary power according to the load 260.

The control unit 110 calculates a sound source signal having a predetermined amplitude according to the fuel supply amount sensed by the fuel supply amount sensing unit 241 and transmits the calculated signal to the sound source generating unit 170 to generate sound. For example, the control unit 110 can calculate a sound source signal having a larger amplitude as the fuel supply amount detected by the fuel supply amount sensing unit 241 increases. Since the acceleration of the automobile is proportional to the amount of fuel supplied to the fuel supply unit 210 and the amplitude of the sound is proportional to the magnitude of the sound, a larger sound can be generated as the acceleration of the automobile increases.

Therefore, since the sound corresponding to the acceleration of the vehicle is outputted, the warning effect given to the pedestrian is large, and the recognition of the vehicle of the pedestrian can be improved.

4 is a view schematically showing the position of a sensor for detecting a pedestrian of a vehicle according to an embodiment of the present invention.

Referring to FIG. 4, the pedestrian sensing unit 180 includes a plurality of sensors. The pedestrian sensing unit 180 is installed at the front and rear of the vehicle, as shown in FIG.

4A, the pedestrian sensing unit 18 may be provided with sensors 182 and 183 on either side of the headlight 2 or on one side of the turn signal lamp 3. [ At this time, it may be provided only to either one of the headlight 2 and the turn signal lamp 3, but it is installed on the left and right sides of the vehicle, respectively. However, the mounting position of the sensor is not limited to the drawings.

A sensor 181 may also be provided on the front portion 181 of the vehicle. At this time, it can also be installed on the bumper 4 on the front or the lower part of the vehicle.

Also, a sensor 184 of the pedestrian sensing unit 180 may be installed on the wheel 8 of the vehicle to sense a pedestrian positioned on the side of the vehicle. At this time, it is preferable to be installed inside the wheel of the wheel, and it is preferable to be installed at each of the front and rear wheels.

As shown in Fig. 4 (b), the sensor of the pedestrian sensing unit 180 is also installed at the rear of the vehicle.

Sensors 187 and 188 can be provided on either or both of the rear brake light 5 and the turn signal lamp 6, which are installed on both the left and right sides. In addition, the sensor 185 can be installed on one side of the vehicle license plate to detect a pedestrian behind the vehicle.

In some cases, a distance sensor installed in the rear of the vehicle may be used as the pedestrian sensing unit 180.

However, the sensor of the pedestrian sensing unit 180 installed at the rear of the vehicle may not recognize the rear vehicle as a pedestrian while driving, so that the sensor of the pedestrian sensing unit 180 does not operate during the vehicle running, And is selectively operable.

In addition, it is preferable that the sensor for detecting the traveling direction of the vehicle during the driving of the vehicle also misses the preceding vehicle, so that it is not operated during driving.

A sensor of the pedestrian sensing unit 180 may be installed on the side mirror 9 of the vehicle, and the pedestrian located on the side of the vehicle is sensed. In this case, the pedestrian sensing unit 180 may be installed only on one of the wheels 8 and the side mirrors 9, and when both sensors are installed on both sides, the sensor 184 installed on the wheel 8 The sensor 189 installed at the side mirror 9 can detect the pedestrian around the reference upper portion of the vehicle height.

5 and 6 are diagrams illustrating an example of acoustic output of a virtual engine sound generator according to an embodiment of the present invention.

5, when a sensing signal is input through the pedestrian sensing unit 180, the control unit 110 applies a control command to the sound source generating unit 170 to provide a sound output unit 160, So that a predetermined sound is output.

5, when the pedestrian is sensed according to a control command of the control unit 110, the sound source generating unit 170 generates a sound wave of a vehicle sensed by the sensing unit 130, And combines the signals S1 and S2 to apply the amplified signal S3 to the sound output unit 160. [

The sound output unit 160 outputs sound to the outside of the vehicle according to the applied signal.

In this case, the sound source generating unit 170 generates a sound source that is not amplified in the interior of the vehicle through the sound source output unit 160 inside the vehicle, so that the size of the sound source output to the inside and the outside of the vehicle .

Meanwhile, when the detection signal is not input through the pedestrian sensing unit 180, the control unit 110 applies a control command to the sound source generating unit 170 in response to detection of the pedestrian.

6, the sound source generating unit 170 combines the signals S5 and S6 of opposite phases with the wavelength of the noise generated in the vehicle sensed by the sensing unit 130 to generate mutually canceled signals S7 To be output through the sound output unit 160. [

In some cases, the sound generator 170 may not output any sound through the sound output unit 160 without generating a separate sound source.

At this time, the sound source generating unit 170 outputs the canceled signal to the sound output unit 160 outside the vehicle, and outputs a normal sound source that is not canceled in the vehicle, so that the sound of the inside and the outside of the vehicle is outputted differently Can be controlled.

The explanation of the acoustic output of the inside and the outside of the vehicle depends on the control command of the control unit 110 according to the sound output or the user command inputted through the input unit 150. [

In other words, the control unit 110 calculates an acoustic signal having a different amplitude according to the fuel injection amount of the fuel supply unit 210, calculates the same phase as the noise generated in the vehicle when a pedestrian is detected in the vicinity of the vehicle, The generating unit 170 generates the amplitude calculated by the controller 70 and the sound corresponding to the phase. In this case, since the fuel injection amount of the fuel supply unit 210 is proportional to the acceleration of the vehicle, a larger sound is generated as the acceleration of the vehicle is larger, and when a pedestrian exists around the vehicle, Sound is output, and there is reinforcement interference with each other, so that there is an effect that the pedestrian can be transmitted with a louder sound.

On the other hand, when a pedestrian is not detected in the vicinity of the vehicle, the noise and the opposite phase generated in the vehicle are calculated, and the sound generator 170 generates sound corresponding to the amplitude and phase calculated by the controller 70 do. In this case, since the fuel injection amount of the fuel supply unit 210 is proportional to the acceleration of the vehicle, a larger sound is generated as the acceleration of the vehicle is larger, and when there is no walking self around the vehicle, Sound is outputted, and there is a destructive interference with each other. Therefore, when there is no pedestrian, a quiet driving environment is provided.

Therefore, there is an advantage in providing a quiet driving environment to the driver when there is a large warning effect to the pedestrian when the pedestrian exists, and when the pedestrian does not exist, because there is a difference in the magnitude of sound generated depending on the presence or absence of the pedestrian . Also, even if the capacity of a speaker mounted on a vehicle is small, there is an advantage that a large sound is effectively generated by using a reinforcing and destructive interference phenomenon.

In addition, since a loud sound is generated when a pedestrian is detected around the lane, the driver has the advantage of being able to recognize the presence of a pedestrian.

 7 is a flowchart illustrating a control method of a virtual engine sound generator according to an embodiment of the present invention.

7, when the vehicle is running (S210), the control unit 110 applies a sensing command to the fuel supply amount sensing unit 241 to sense the fuel injection amount injected into the fuel cell stack 250, The unit 241 senses the fuel injection amount supplied to the fuel cell stack 250 (S213)

The control unit 110 calculates a sound source signal having a different amplitude according to the fuel injection amount sensed by the fuel supply amount sensing unit 241. (S215) For example, as the fuel supply amount is large, a sound source signal with a large amplitude can be calculated .

The control unit 110 applies a pedestrian sensing command to the pedestrian sensing unit 180, and senses a pedestrian around the vehicle through a plurality of sensors installed in the vehicle (S220). Also, the control unit 110 applies a control command to the sensing unit 130 to sense the wavelength of the noise generated in the vehicle, and the sensing unit 130 senses the wavelength of the noise generated in the vehicle.

At this time, the sensor for sensing the front and rear directions of the vehicle does not operate while the vehicle is traveling, and can selectively operate according to a control command of the control unit 110 when the vehicle stops or moves backward. This is because other vehicles are located in front of and behind the vehicle during driving and the vehicle can be detected as a pedestrian.

In addition, the control unit 110 can control whether the pedestrian is detected according to the setting of the input unit 150, and controls the pedestrian sensing unit 180 to automatically detect the pedestrian according to the case as described above .

When a pedestrian is detected through the pedestrian sensing unit 180 and a sensing signal is input to the control unit 110 at step S230, the control unit 110 determines that a pedestrian exists around the vehicle, .

As described above, the sound source generating unit 170 combines the sound source signals on the same level with the noise generated in the vehicle, and applies the amplified sound source to be output through the sound output unit 160 (S240).

On the other hand, when the pedestrian is not detected, the sound source generating unit 170 does not apply the sound source to the sound output unit 160, or combines the sound source signal having opposite phase to the noise generated in the vehicle, (S250).

In response to the signal applied from the sound generator 170, the sound output unit 160 outputs different sounds for the amplified sound source signal or the canceled sound source signal according to the presence or absence of the pedestrian at step S260.

At this time, the control unit 110 not only outputs sound according to the presence of the pedestrian, but also can output different sounds by distinguishing the sound output unit 160 located inside the vehicle from the sound output unit located outside the vehicle . The sound source generating unit 170 generates a sound source according to whether a pedestrian exists or not, and applies the sound source to the sound output unit. In accordance with a control command of the controller 110, sound different from the inside and the outside of the vehicle can be output. For example, in the vehicle, sound according to a general sound source signal is output through the sound output unit, and the sound source may be amplified or canceled according to whether a pedestrian is detected outside the vehicle.

Therefore, the automobile and the control method thereof according to the present invention allow the pedestrian to recognize the approach of the vehicle through the sound outputted from the vehicle, as well as the driver who drives the vehicle, as well as the pedestrian around the vehicle, And the incidence rate is reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

<Description of Symbols>

110: control unit 120:

130: sensing unit 140: display unit

150: input unit 160: sound output unit

170: sound source generating unit 180: pedestrian sensing unit

Claims (18)

1. A fuel cell system comprising: a fuel cell stack including a plurality of unit cells for supplying electricity of a vehicle;
A fuel supply unit for supplying fuel to the fuel cell stack;
An oxidant supplier for supplying an oxidant to the fuel cell stack; And
And a fuel supply amount sensing unit for sensing a fuel supply amount supplied to the fuel cell stack,
A pedestrian sensing unit for sensing a pedestrian around the vehicle;
A control unit receiving a sensing signal of the pedestrian sensing unit and the fuel supply amount sensing unit and applying a control command thereto;
A sound source generating unit for generating different sound source signals in accordance with the presence or absence of a pedestrian in response to the control command and generating different sound source signals according to the fuel supply amount; And
And an acoustic output unit for outputting a predetermined sound according to the sound source signal of the sound source generating unit. The method according to claim 1,
The fuel cell system includes:
And a humidifying portion for humidifying the fuel supplied to the fuel supply portion. 3. The method of claim 2,
The humidifier may include:
A humidifier for humidifying the fuel supplied from the fuel supply unit; And
And a water supply unit for supplying water to the humidified fuel in the humidifier. The method according to claim 1,
The fuel cell system includes:
Further comprising a supply amount regulating unit for regulating a supply amount of the fuel supplied from the fuel supply unit and an oxidant supplied from the oxidant supply unit. 5. The method of claim 4,
Wherein the supply amount regulating section includes a control valve regulated by the control section. The method according to claim 1,
Wherein,
A virtual engine sound generator for generating sound source signals of different wavelengths according to presence or absence of a pedestrian. The method according to claim 1,
Wherein,
And generates a sound source signal of a predetermined amplitude according to the fuel supply amount detected by the fuel supply amount sensing unit. The method according to claim 6,
According to the control command, the sound source generating unit generates an amplified sound source signal by combining the sound generated from the vehicle and a sound source on the same level when the pedestrian exists, and when the pedestrian does not exist, And generates a canceled sound source signal by combining the sound sources and applies the generated sound source signal to the sound output unit. The method according to claim 1,
Wherein the sound output unit is installed inside the vehicle and outside the vehicle, respectively. 10. The method of claim 9,
Wherein the sound source generating unit applies different sound source signals to the sound output unit to the inside of the vehicle and the sound output unit installed outside the vehicle to output different sounds. The method according to claim 1,
Further comprising an input unit having a pedestrian sensing key for turning on and off the operation of the pedestrian sensing unit. 6. The method of claim 5,
When the pedestrian sensing key is turned on, the control unit controls the pedestrian sensing unit to operate, and when the pedestrian sensing key is turned off, the pedestrian sensing unit is controlled according to the driving state of the vehicle and the vehicle position so that the pedestrian sensing is performed And outputs the virtual engine sound. The method according to claim 1,
Further comprising a display section for outputting a vehicle running state,
Wherein the controller outputs the guidance according to the presence of a pedestrian through the display unit when the pedestrian is sensed. 14. The method of claim 13,
Wherein the display unit displays the position of the pedestrian based on the vehicle. 1. A vehicle driven by a motor and including a virtual engine sound generator,
The commercial virtual engine sound generating device includes:
A fuel cell stack including a plurality of unit cells for supplying electricity to the motor;
A fuel supply unit for supplying fuel to the fuel cell stack;
An oxidant supplier for supplying an oxidant to the fuel cell stack; And
And a fuel supply amount sensing unit for sensing a fuel supply amount supplied to the fuel cell stack,
A pedestrian sensing unit for sensing a pedestrian around the vehicle;
A control unit receiving a sensing signal of the pedestrian sensing unit and the fuel supply amount sensing unit and applying a control command thereto;
A sound source generating unit for generating different sound source signals in accordance with the presence or absence of a pedestrian in response to the control command and generating different sound source signals according to the fuel supply amount; And
And an acoustic output unit for outputting a predetermined sound according to a sound source signal of the sound source generating unit. A fuel injection amount sensing step of sensing a fuel injection amount injected into the fuel cell stack;
An arithmetic operation step of calculating a sound source signal having a different amplitude according to the amount of fuel injected in the step of sensing the amount of fuel injected;
A pedestrian detecting step of detecting a pedestrian around the vehicle;
A pedestrian presence determining step of determining whether a pedestrian is present by receiving a detection signal in the pedestrian sensing step; And
In the pedestrian presence determination step, when it is determined that a pedestrian exists,
And generating a virtual engine sound of the excitation signal calculated in the arithmetic operation step. 17. The method of claim 16,
In the pedestrian presence determination step, when it is determined that a pedestrian exists,
And generating a virtual engine sound by modifying the sound source signal calculated in the calculating step to the same phase as the noise generated in the vehicle. 17. The method of claim 16,
In the pedestrian presence determination step, when it is determined that the pedestrian does not exist,
And generating a virtual engine sound by modifying the sound source signal calculated in the calculating step to a phase opposite to a noise generated in the vehicle.

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