JP5692142B2 - Simulated sound generating device, simulated sound generating method, program, and medium - Google Patents

Description

  The present invention relates to a simulated sound generating device, a simulated sound generating method, a program, and a medium that artificially generate a running sound of a vehicle.

  The generation of the simulated sound that simulates the sound related to the traveling of the vehicle may be performed in a game machine related to the vehicle, a simulator for education or demonstration, or a simulator for design. Japanese Patent Application Laid-Open No. 2004-228561 describes recording sound of a certain engine rotation region and simulating the sound according to the number of rotations.

  In the prior art described in Patent Document 1, the engine rotation speed is calculated based on the accelerator opening signal, the shift position signal, the engine output characteristics, and the vehicle running resistance data, and this is used as the engine rotation speed signal. Based on this engine rotation speed signal, it is disclosed to control the means for generating the simulated sound.

Japanese Patent No. 4079518

  However, since such a simulated sound generator generates a simulated sound according to the engine speed, a more appropriate simulated sound is generated particularly in a hybrid vehicle, an electric vehicle, a vehicle having a continuously variable transmission, and the like. There was a problem that it was difficult to occur.

  In view of the above problems, the present invention provides a simulated sound generating apparatus, a simulated sound generating method, a program for executing the method, and a medium storing and storing the program that can generate a more appropriate simulated sound. Objective.

In order to solve the above problem, a simulated sound generating apparatus according to the present invention includes a gear stage determination unit that determines a gear stage based on transmission characteristics from a driving force and a vehicle speed generated on an axle of a driving wheel of a vehicle, and the vehicle speed. A rotation speed calculation means for calculating the rotation speed of the internal combustion engine from the gear stage, a selection means for selecting a timbre map corresponding to the driving force, a generation means for generating a simulated sound from the timbre map and the rotation speed, , only contains the tone color map, the first tone map, the second tone map, and wherein the third tone map, the selection means, from a predetermined value the driving force is zero or more and positive When the driving power is smaller than the predetermined value, the second timbre map is selected. When the driving power is smaller than zero, the third timbre map is selected. be characterized by selecting the .

The simulated sound generating method according to the present invention includes a gear stage determining step for determining a gear stage based on a transmission characteristic from a driving force and a vehicle speed generated on an axle of a driving wheel of a vehicle, and an internal combustion from the vehicle speed and the gear stage. seen including a rotation speed calculation step of calculating the rotational speed of the engine, a selection step of selecting a tone color map corresponding to the driving force, a generation step of generating a simulated sound from the rotational speed and the tone color map, and the The timbre map includes a first timbre map, a second timbre map, and a third timbre map. In the selection step, when the driving force is 0 or more and smaller than a predetermined value that is a positive value, the first timbre map The second timbre map is selected when the driving force is greater than or equal to the predetermined value, and the third timbre map is selected when the driving force is less than zero. When That. The program of the present invention is a program for executing the simulated sound generation method, and the medium of the present invention is a medium storing the program.

  According to the present invention, a more appropriate simulated sound can be generated.

It is a block diagram which shows one Embodiment of the simulated sound generator 1 of the Example which concerns on this invention. It is a schematic diagram which shows one Embodiment of the shift map used for the simulation sound generator 1 of an Example. It is a schematic diagram which shows one Embodiment of the audio | voice map used for the simulation sound generator 1 of an Example. It is a flowchart which shows one Embodiment of the control content of the simulation sound generator 1 of an Example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the simulated sound generator 1 of this embodiment includes a voice ECU 2 (Electronic Control Unit), a sound source IC 3, a D / A converter 4, an amplifier 5, a speaker 6, and an A / D converter 7. Consists of including. The simulated sound generator 1 of this embodiment is mounted on a hybrid vehicle or an electric vehicle.

  The voice ECU 2 includes, for example, a CPU, a ROM, a RAM, a data bus connecting them, and an input / output interface, and the CPU performs predetermined processing described below in accordance with a program stored in the ROM. The voice ECU 2 constitutes a gear stage determination means 2a, a rotation speed calculation means 2b, and a selection means 2c.

  The A / D converter 7 A / D converts the vehicle speed from a vehicle speed sensor (not shown) and outputs it to the voice ECU 2, and A / D converts the drive torque generated on the axle of the drive wheel of the vehicle from the torque sensor (not shown). And output to the voice ECU 2. The driving force F may be used instead of the driving torque. In this case, the driving force F is obtained by conversion from the driving torque T and the dynamic load radius Rd according to the equation F = T / Rd. This conversion may be performed either outside or inside the voice ECU 2.

  The gear stage determination means 2a of the voice ECU 2 is based on the driving torque or driving force input from the A / D converter 7 and the vehicle speed based on the shift map (transmission characteristics) shown in FIG. ) And the drive wheels are driven via the transmission, it is determined and determined which gear stage is selected by the virtual transmission. In FIG. 2, 1st, 2nd, 3rd, 4th, and 5th indicate exemplary gear stages, a solid line indicates an up side, and a broken line indicates a down side. That is, it means that the gear stage is different even at the same vehicle speed, depending on whether the transition direction of the vehicle speed is increased or decreased.

  Next, the rotation speed calculation means 2b of the voice ECU 2 calculates a virtual rotation speed Ne corresponding to the vehicle speed and gear ratio in the virtual engine of the vehicle. This rotational speed Ne is obtained by the following equation, for example. “Ne = V (vehicle speed) / I (tire circumferential length) × IF (final gear ratio) × Ii (gear ratio)”.

  Further, the selection means 2c of the voice ECU 2 is configured so that the driving force or the driving force is a low / medium driving force smaller than a predetermined value, the driving force is a predetermined value or more and a high driving force, and the driving force is a negative driving force smaller than zero. The case is divided into three cases. In other words, cases are classified based on the positive / negative driving force and the magnitude relationship. The selection means 2c selects, for example, the timbre map shown in FIGS. 3A to 3C in correspondence with these three cases. FIG. 3A shows the timbre map 1 when the driving force is low and medium, FIG. 3B shows the timbre map 2 when the driving force is high, and FIG. 3C shows the negative driving force. The timbre map 4 in the case is shown.

  The sound source IC 3 (generating means) determines a frequency corresponding to each order (order in FIG. 3) from one of the three types of voice maps selected by the selecting means 2c of the voice ECU 2 and the virtual engine speed Ne. Then, a simulated sound signal is generated, and the amplifier 5 is driven via D / A conversion by the D / A converter 4. The amplifier 5 amplifies the simulated sound signal and then drives the speaker 6 to simulate the simulated sound. Is generated.

  In the timbre map 1 in FIG. 3 (a), when the driving force is low and medium, the main engine explosion order is composed of integer order components up to the fourth order, and it corresponds to the fact that there is no interference between the orders in the complete harmony pitch. ing. In other words, the simulated sound generated by the voice map 1 is not turbid for the driver, and does not require a large driving torque (or driving force) when cruising at a constant speed for a long time on an expressway or in an urban area. For example, listening to it for a long time does not lead to fatigue and does not hinder the maintenance of concentration. That is, the simulated sound generated by the timbre map 1 is a timbre that is familiar to the driver and is a sound corresponding to the vehicle motion state in the neutral driving force state.

  As shown in the timbre map 2 in FIG. 3B, when the driving force is high, the 2.5th order and the 3.5th order are added, and the modulation feeling and fluctuation are caused by the acoustic interference due to the increase in sound pressure and the dissonant pitch. A simulated sound corresponding to an increase in the amount of inflow air of the internal combustion engine and a work state near the upper limit of the internal combustion engine is generated in a scene where a high acceleration force due to a high driving force is exhibited.

  Further, as shown in the timbre map 4 in FIG. 3 (c), the order component of the low and medium driving force order is simplified (reduced component) at the time of minus driving, the sound pressure is lowered, and the internal combustion engine is operated at the time of deceleration. Therefore, a simulated sound corresponding to an inactive state corresponding to a state where the combustion pressure is low and the vehicle is turned from the driving wheel side due to the inertia of the vehicle is generated.

  In the present embodiment, at least one order component is common among the three timbre maps, so that a driver can recognize a change in driving torque (driving force) by hearing, but is generated from one vehicle. As a sound, it fosters a sense of unity and unity in the timbre. Further, since the aerodynamic noise increases in proportion to the square of the vehicle speed in the high speed range, correction is also performed to increase the sound volume at the same rotational speed corresponding to the same internal combustion engine.

  Furthermore, the control content of the simulation sound generator 1 of the present embodiment will be described based on the flowchart of FIG. In step S1, the voice ECU 2 detects information on the vehicle speed, and in step S2, detects the driving torque or driving force. Subsequently, the gear stage determination means 2a of the voice ECU 2 determines which of the virtual gear stages is based on the shift map and the driving torque or driving force shown in FIG.

  In step S4, the rotational speed calculation means 2b of the voice ECU 2 calculates the rotational speed of the virtual internal combustion engine based on the above-described calculation formula. In step S5, the selection means 2c of the voice ECU 2 calculates the driving torque and the predetermined value. Based on the magnitude relation and positive / negative based on the comparison, the timbre map 1 is selected if the driving force is low / medium driving force, the timbre map 2 is selected if the driving force is high, and the timbre map is determined if the driving force is negative. 4 is selected, and timbre determination is performed. In step S6, the sound source IC3 reads the selected tone color map, generates a pseudo sound (simulated sound) based on the tone color map and the number of rotations, performs volume correction as shown in step S7, and then proceeds to step S8. As shown, the sound source IC 3 drives the amplifier 5 and the speaker 6 to output a simulated sound.

  According to the present embodiment realized by the control described above, the simulated sound generation method of the present invention is executed. According to the present embodiment, the following operational effects can be obtained. In the hybrid vehicle that is the premise of the present embodiment, the driving force (driving torque) is generated by the internal combustion engine and the motor. Therefore, if a pseudo sound synchronized with the actual rotational speed of the internal combustion engine is generated, the pitch increases. Significant unnaturalness arises in the relationship between the descent and the vehicle motion state such as the change in vehicle speed perceived by the driver and the acceleration perceived by the vestibular organ. In this embodiment, this unnaturalness can be eliminated by generating a pseudo sound synchronized with the rotational speed of the internal combustion engine by a virtual gear stage corresponding to the driving force and the vehicle speed.

  The electric vehicle, which is another premise of the present embodiment, also covers a wide speed range without having a gear mechanism having a gear stage, so that sound and vehicle motion state (acceleration and steady running) are also accompanied by the motor rotation rise. ) Does not match and unnaturalness occurs. In this embodiment, this unnaturalness in the electric vehicle can be eliminated by generating a pseudo sound synchronized with the rotational speed of the virtual internal combustion engine.

  Furthermore, under both premises, during the deceleration, the noise of the system that continuously generates information about the change in driving torque (driving force) is generated by the motor noise generated by the regenerative power generation by the motor. However, it also contributes to the driver's peace of mind and safety. According to the present embodiment, in this sense as well, it is possible to prevent a sudden change in the motor sound from occurring due to the generation of the pseudo sound.

  In addition, the required driving force is determined by the amount of operation by an input means such as an accelerator pedal, whereas the driving force generated on the axle of the driving wheel is affected by the state of charge (SOC) of the secondary battery for driving the motor and the temperature. Therefore, the amount of operation of the accelerator pedal or the like does not necessarily match. In recent years, there is also a control for changing the relationship between the driving force and the operation amount of the accelerator pedal or the like by a power mode switch, and the tendency of this mismatch is intensifying. In this embodiment, the unnaturalness caused by the mismatch in the hybrid vehicle and the electric vehicle is also eliminated by generating a pseudo sound synchronized with the rotational speed of the internal combustion engine by the virtual gear stage corresponding to the driving force (driving torque) and the vehicle speed. be able to.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to. In particular, the detection mode and estimation mode of the driving force generated on the axle of the driving wheel may be based on other methods. Further, the case classification based on the magnitude relationship of the driving force can be subdivided as compared with the embodiment.

  The present invention relates to a simulation sound generating device that simulates a running sound of a running vehicle, and in particular, a simulation according to vehicle speed and driving force in a hybrid vehicle, an electric vehicle, and a vehicle having a continuously variable transmission. Sound can be generated, and the feedback of the operation of the driver to the drive system and the grasping of the motion state (acceleration / deceleration and steady running) of the vehicle are promoted by the sound. Therefore, the present invention is useful when applied to various vehicles such as passenger cars, trucks, and buses.

1 Simulated sound generator 2 Voice ECU
2a Gear stage determination means 2b Rotational speed calculation means 2c Selection means 3 Sound source IC (generation means)
4 D / A converter 5 Amplifier 6 Speaker 7 A / D converter

Claims (4)

Gear stage determination means for determining a gear stage based on transmission characteristics generated from an axle of a drive wheel of a vehicle and vehicle speed based on transmission characteristics, and a rotation speed calculation means for calculating the rotation speed of the internal combustion engine from the vehicle speed and the gear stage If, selection means for selecting a tone color map corresponding to the driving force, seen including a generation unit, a generating a simulated sound from the rotational speed and the tone color map, the tone color map, the first tone map, the 2 and a third timbre map, and the selection means selects the first timbre map when the driving force is less than a predetermined value which is 0 or more and a positive value, and the driving force is The simulated sound generator according to claim 1, wherein the second timbre map is selected when the predetermined value or more is selected, and the third timbre map is selected when the driving force is smaller than zero . A gear stage determining step for determining a gear stage based on transmission characteristics generated from a driving force and a vehicle speed generated on an axle of a driving wheel of the vehicle, and a rotational speed calculating step for calculating the rotational speed of the internal combustion engine from the vehicle speed and the gear stage. When a selection step of selecting a tone color map corresponding to the driving force, seen including a generating step, the generating the simulated sound from the rotational speed and the tone color map, the tone color map, the first tone map, the 2 and a third timbre map, and in the selection step, when the driving force is 0 or more and smaller than a predetermined value which is a positive value, the first timbre map is selected, and the driving force is A simulated sound generation method comprising: selecting the second timbre map when the predetermined value is greater than or equal to the predetermined value; and selecting the third timbre map when the driving force is less than zero .   A program for executing the simulated sound generation method according to claim 2.   A medium storing the program according to claim 3.

Images