WO2010114248A2

WO2010114248A2 - Method for controlling the travel mode of an electric vehicle

Info

Publication number: WO2010114248A2
Application number: PCT/KR2010/001796
Authority: WO
Inventors: 이정용
Original assignee: 주식회사 레오모터스
Priority date: 2009-03-31
Filing date: 2010-03-24
Publication date: 2010-10-07
Also published as: KR101161613B1; WO2010114248A3; KR20100109197A

Abstract

The present invention relates to a method for controlling the travel mode of an electric vehicle. The present invention relates to a method for controlling the travel mode of an electric vehicle driven by a motor, wherein said travel mode includes a sound mode for the sound of the electric vehicle during travel of the electric vehicle and a torque mode for the torque of the motor during the travel of the electric vehicle, and wherein said method comprises the steps of: sensing whether the RPM of the motor is gradually decreasing or gradually increasing so as to output an engine sound in accordance with the variation of the RPM of the motor; and outputting the engine sound, after adjusting the tune and beat in proportion to the variation of the RPM, on the basis of the sensed result, to thereby control the sound mode.

Description

Driving mode control method of electric vehicle

The present invention relates to an electric vehicle, and more particularly, to a driving mode control method of an electric vehicle that is improved to transmit the engine sound to the electric vehicle that is driven by a motor that does not make the engine sound.

In recent years, electric vehicles have been actively developed for the purpose of developing alternative energy and preventing environmental pollution. The driving source of such an electric vehicle is a motor.

In general, an electric vehicle driven by a motor does not generate an engine sound, and thus a pedestrian may not recognize a driving state of the vehicle, thereby causing a pedestrian to be inadvertently injured.

Accordingly, in the case of an electric vehicle driven by a motor, it is necessary to send an engine sound such as a gasoline engine to the outside to recognize the pedestrian that the vehicle is running.

1 is a RPM vs. torque curve of a typical automobile engine.

As shown in this figure, the gasoline engine employed in a typical vehicle is gradually increased until the RPM reaches a maximum torque until the maximum torque of the engine is reached, and when the RPM increases after reaching the maximum torque, the torque becomes smaller. The torque of the engine is reduced.

In this way, the gasoline engine takes a considerable time to reach the maximum torque, and although the configuration is provided to reach the maximum torque in each RPM region through gear shifting, the rapid drop and rise of the RPM is repeated, the engine power It has the disadvantage of not using the band efficiently.

In addition, the RPM versus torque curve resulting from the adoption of a controller in the motor is well illustrated in FIG. 2.

The solid line shown in FIG. 2 is a curve shown by employing any one controller in the motor so that the motor can reach the maximum torque at 2000 RPM. In addition, the dotted line shown in FIG. 2 is a curve appearing by employing another controller in the motor so that the motor can reach the maximum torque at 3000 RPM. As such, by controlling a motor to a controller, a person skilled in the art may easily implement the RPM vs. torque curve shown in FIG. 2.

However, when the motor is controlled by one controller such as the solid line or the dotted line shown in FIG. 2, it takes a relatively long time to reach the maximum torque of the motor as in the general engine shown in FIG. As the fall and rise is repeated, there is a disadvantage in that the power band of the motor cannot be used efficiently.

The present invention has been made to solve the above problems, an object of the present invention is to provide a driving mode control method for an electric vehicle that enables the electric vehicle driven by the motor to send the engine sound to the outside. .

Another object of the present invention is to provide a driving mode control method for an electric vehicle, which allows the motor, which is the driving source of the electric vehicle, to be controlled by a plurality of controllers and allows the motor to reach maximum torque in a short time without a large change in RPM. will be.

In order to achieve the above object, the present invention provides an electric vehicle driven by a motor, the driving mode including a sound mode for the sound in the running state of the electric vehicle and a torque mode for the torque of the motor in the running state. Sensing whether the change of the RPM is gradually decreased and gradually increased so that the engine sound can be output according to the change of the RPM of the motor; And outputting the engine sound by adjusting a pitch and a beat in proportion to the RPM change, based on the sensed result.

Identifying whether a USB is connected to an engine sound input port of the electric vehicle, and outputting an engine sound selected by a user among engine sounds stored in the USB based on the sensed result. It is preferable to be.

The present invention further includes detecting whether the accelerator pedal is pressed and the brake pedal with the change of the RPM of the motor, so that the pitch and the beat of the engine sound when the accelerator pedal is pressed are 3%. It is preferably configured to output in a state of amplified to 5%, and to output the pitch and beat of the engine sound in a reduced state of 3% to 5% when the brake pedal is pressed.

The motor is controlled by a control unit having a plurality of torque modes by a plurality of controllers, wherein each torque mode is configured such that the motor has a maximum torque value at different RPMs, and the control unit changes the RPM. The sensor unit senses whether is gradually decreased and is gradually increased, and whether the RPM of the motor is equal to the switching point value, and as a result of the sensing, the RPM of the motor In the case of coinciding with the point value, the control unit is preferably configured to convert the torque mode of the motor according to whether the change in the RPM is gradually decreased and gradually increased.

In the driving mode control method of the electric vehicle according to the present invention having the above-described configuration, the engine sound can be sent to the outside according to the driving state of the electric vehicle by sensing a change in RPM of the motor, thereby driving to a pedestrian. You can recognize the state. As a result, according to the present invention, the pedestrian has an advantage of being able to significantly suppress an accident caused by an accident such as colliding with a vehicle.

In addition, the present invention is configured so that the mode conversion of the motor is made by sensing whether the RPM is a switching point value, so that the time to reach the maximum torque in all the RPM region can be shortened, thereby effectively reducing the power band of the motor. Has the advantage of operating as.

1 is a RPM vs. torque curve of a typical automotive engine.

2 is a RPM vs. torque curve of a typical motor.

Figure 3 is an RPM versus torque curve shown by employing the driving mode control method of the electric vehicle according to an embodiment of the present invention.

Figure 4 is a block diagram of one embodiment of the present invention.

5 is a control flow diagram showing a control flow of an embodiment of the present invention.

Hereinafter, a driving mode control method of an electric vehicle according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is an RPM vs. torque curve shown by employing the driving mode control method of the electric vehicle according to an embodiment of the present invention, Figure 4 is a block diagram of an embodiment of the present invention, Figure 5 shows a control flow of an embodiment of the present invention Control flow chart.

As shown in these drawings, the driving mode control method of the electric vehicle according to the present invention, based on the sensed results by sensing whether the change in the RPM of the motor is gradually reduced and gradually increased, It is configured to control the sound mode for the sound such as the engine sound in the driving state of the electric vehicle, and to control the torque mode for the torque of the motor in the driving state.

First, a method of controlling a sound mode for the engine sound will be described.

That is, in the case of an electric vehicle driven by a motor, since engine sounds such as gasoline engines are not transmitted to the outside, a pedestrian may be in an accident. Therefore, the present invention is configured to sense a change in the RPM of the motor, and output an engine sound based on the sensed result.

As shown in FIG. 4, the control unit causes the sensor unit to sense the RPM of the motor unit including the motor and the controller, and causes the engine sound output unit to output the engine sound previously input based on the sensed result.

For example, as shown in FIG. 5, when the RPM of the motor is gradually increased as a result of the sensing of the sensor unit, the controller gradually increases the pitch of the engine sound previously input by the engine sound output unit and measures the time. It should be gradually accelerated and sent out. On the contrary, in the case where the RPM of the motor is gradually decreased, the mall controller causes the engine sound output unit to gradually lower the pitch of the engine sound and gradually slow the beat to send it out.

If there is no change in the RPM of the motor, the control unit causes the engine sound output unit to maintain the pitch and beat of the engine sound as it is.

As described above, according to the present invention, the engine sound can be transmitted to the outside according to the driving state of the electric vehicle by sensing the change in the RPM of the motor, thereby making it possible to recognize the driving state to the pedestrian. In this way, it is possible to significantly suppress an accident caused by a pedestrian from colliding with a vehicle.

In the present embodiment, a configuration is provided in which a user can select and transmit an engine sound to the outside in addition to the engine sound previously input. That is, the present embodiment includes the step of identifying whether the USB is connected to the engine sound input port of the electric vehicle, and based on the result to be sensed, the engine sound selected by the user among the engine sounds stored in the USB. It is configured to output. This embodiment having such a configuration has the advantage that can be output to the outside as needed by the user desired engine sound can increase the convenience of the user.

Next, a method of controlling the torque mode of the motor will be described. In the present embodiment, the motor is controlled by a control unit having a plurality of torque modes by a plurality of controllers, and the respective torque modes are: The motor is configured to have a maximum torque value at different RPMs.

Each controller is configured to control the motor such that the motor has a maximum torque value at different RPMs, as shown in FIG. 3, and wherein the controller is configured to control the motor based on a sensing result of the sensor unit. It is configured to be controlled by any one of the controller.

In the present embodiment, the torque mode by each controller is composed of M1 mode, M2 mode, M3 mode and M4 mode, but more torque modes can be added. The M1 mode corresponds to the case where the RPM is 0 to R1, the M2 mode corresponds to the case where the RPM is R1 to R2, the M3 mode corresponds to the case where the RPM is R2 to R3, and the M4 mode to the RPM This is the case when R3 or more. Each torque mode is configured such that the motor has a maximum torque value at different RPMs.

Here, the RPM versus torque curve of each torque mode will be described. In the RPM vs. torque curve, as shown in FIG. 3, the torque value gradually increases when the RPM increases in the region before the RPM having the maximum torque value, and the RPM increases in the region after the RPM having the maximum torque value. The starting torque value is formed to decrease gradually.

The present invention is configured to enable the motor to have the RPM versus torque curve characteristics of the respective torque modes by the control unit, and at the same time, the torque mode can be changed so that the maximum torque can be reached within a short time without a great change in RPM during driving. do.

That is, the controller is configured such that the motor is operated in any one of the torque modes while the vehicle is running, and whether or not the RPM of the motor during driving is equal to the value of the switching points S1, S2, and S3. The sensor unit is configured to sense and convert the torque mode of the motor when the RPM of the motor coincides with the values of the switching points S1, S2, and S3.

In the present exemplary embodiment, the switching points S1, S2, and S3 are three, and for convenience of description, the first switching point S1, the second switching point S2, and the third switching point S3 are provided. I'll name it.

The control unit is configured such that each of the switching points S1, S2, and S3 corresponds to a point at which two adjacently arranged curves of the RPM versus torque curves of the respective torque modes cross each other. The values of points S1, S2, and S3 eventually become RPMs corresponding to their intersections.

As a result of sensing by the sensor unit, when the RPM of the motor coincides with the value of the switching points S1, S2, and S3, the controller converts the torque mode of the motor.

On the other hand, the conversion of the torque mode of the motor is preferably made of the conversion in the RPM increase mode and the conversion in the RPM decrease mode. That is, when the RPM of the motor is gradually increased along the positive direction of the X axis of FIG. 3, the mode change is made along the positive direction, and when the RPM is gradually reduced along the negative direction, the mode change This should be done along the negative direction.

Accordingly, in the present embodiment, as shown in the control flow diagram of FIG. 5, the controller causes the sensor unit to detect whether the RPM of the motor is gradually increasing, and if the detected result is a gradual increase, the mode change is performed. Mode change in the RPM increase mode, i.e., the positive direction of the X-axis is made, and in the case of gradual reduction, the mode change causes the mode change in the RPM decrease mode, i.e., the negative direction of the X-axis.

The present embodiment having such a configuration is configured to perform mode conversion of the motor by sensing whether the RPM is the value of the switching point S1, S2, or S3, thereby rapidly decreasing the RPM to reach the maximum torque. Delay and inefficient operation of the power band of the motor can be prevented. That is, according to the present embodiment, it is possible to shorten the time until reaching the maximum torque in all RPM region has the advantage that the power band of the motor can be efficiently operated.

Meanwhile, in another embodiment of the present invention, when the RPM of the motor is gradually increased as a result of the sensing of the sensor unit, it means that the driver increases the speed by stepping on the accelerator pedal (accelerator). It is configured to detect the change in the RPM of the acceleration pedal of the engine, the control unit in addition to causing the engine sound output unit to gradually increase the pitch of the engine sound in accordance with the change of the RPM and gradually beat the beat It is also possible to amplify the pitch and beat of the engine sound by 3% to 5% to send out to the outside. On the contrary, if the RPM of the motor is gradually reduced, it means that the speed is reduced by the driver stepping on the brake pedal, wherein the sensor unit is configured to detect a change in the RPM of the motor and press the brake pedal. The control unit may cause the engine sound output unit to gradually reduce the pitch of the engine sound according to the change of the RPM and gradually slow the beat to 3% to 5%. It is also possible to be configured to send out.

As mentioned above, although preferred embodiment about this invention was described, this invention is not limited to the above-mentioned embodiment, It is defined by what was described in the claim, and it is clear that various deformation | transformation and adaptation are possible in the technical field to which this invention belongs. Do.

Claims

An electric vehicle driven by a motor, for controlling a driving mode including a sound mode for the sound in the running state of the electric vehicle and a torque mode for the torque of the motor in the running state,

Sensing whether the change in the RPM is gradually decreased and gradually increased so as to output the engine sound according to the change in the RPM of the motor; And

And outputting the engine sound by adjusting the pitch and beat in proportion to the RPM change, based on the sensed result, and controlling the sound mode. Way.
The method of claim 1,

And identifying whether a USB is connected to an engine sound input port of the electric vehicle, and outputting an engine sound selected by a user among engine sounds stored in the USB based on the sensed result. Driving mode control method for an electric vehicle, characterized in that.
The method of claim 1,

And detecting whether the accelerator pedal is pressed and the brake pedal are pressed together with the change of the RPM of the motor.

When the accelerator pedal is pressed and configured to output the pitch and beat of the engine sound amplified 3 to 5%,

And when the brake pedal is pressed, outputting the pitch and beat of the engine sound in a state of reducing 3% to 5%.
The method of claim 1,

The motor is controlled by a controller having a plurality of torque modes by a plurality of controllers,

Each torque mode is configured such that the motor has a maximum torque value at different RPMs,

The controller allows the sensor unit to sense whether the change in the RPM is gradually decreased or gradually increased, and whether the RPM of the motor is equal to the switching point value.

In response to the sensing result, when the RPM of the motor coincides with the switching point value, the controller is configured to convert the torque mode of the motor according to whether the change of the RPM is gradually decreased and gradually increased. Driving mode control method for an electric vehicle, characterized in that.