JPH07177601A - Electric vehicle and controller therefor - Google Patents

Abstract

PURPOSE:To provide an electric vehicle and controller therefor in which the operating conditions of electric vehicle is detected from electric components, the pulsating current of motor is varied based on the detected signals, and the operating conditions are notified to a driver and persons present around the vehicle by means of an electromagnetic sound having tone quality generated from the motor. CONSTITUTION:A controller 7 for a power converter 2 is provided with means 780 for notifying the operating conditions of an electric vehicle based on information obtained from electric components. A current control means 750 controls the power converter 2 to generate an electromagnetic sound having tone quality based on the information received from the means 780. This constitution ensures safety of driver and persons present around an electric vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle and a control device therefor, and more particularly to a means for informing a driver and a person near the electric vehicle of the operating state of the electric vehicle.

[0002]

2. Description of the Related Art Electric vehicles, such as electric vehicles, have been provided as a pollution-free vehicle due to the problem of global environmental damage, and as a useful transportation means in place of a gasoline vehicle.

In the current gasoline-powered vehicles,
The driving range information is reported on the display panel of the driver's seat or by the backward buzzer. Also, with respect to persons near the vehicle, there are some large trucks and the like that are provided with a lamp display according to the speed. On the other hand, as an example of utilizing the electromagnetic noise from the power converter and the electric motor as the notification means, the content of generating predetermined acoustic information by controlling the ripple component of the electric current of the electric motor is disclosed in JP-A-2-179297. ing.

[0004]

When the electric vehicle is in a traveling or runnable state, a means for informing the driver or a person in the vicinity of the electric vehicle of the operating state, that is, notifying is required.

An object of the present invention is to obtain an electric vehicle control device for informing the driver and people in the vicinity of the electric vehicle of how the electric vehicle is operating. Furthermore,
To obtain an electric vehicle that can ensure the safety of the driver and those near the electric vehicle.

[0006]

The present invention relates to an electric vehicle control device for driving and driving an electric vehicle, comprising an electric motor, a power converter for supplying electric power to the electric motor, and a control device for controlling the power converter. It is about improvement.

According to one aspect of the present invention, there is provided a driving state notifying means for notifying a driving state by an electromagnetic sound from an electric motor triggered by a signal for detecting a driving state of an electric vehicle. Typical examples of this are shift lever position states such as forward (D), reverse (R) and parking (P),
It informs of an overspeed condition where the speed of the electric vehicle is over the speed limit and an unsafe driving condition such as a half-door, forgetting to lock the door, or not wearing a seat belt.

According to another aspect of the present invention, a signal that detects an abnormal state of a device such as insufficient battery capacity of an electric vehicle and overheating of a power converter or an electric motor is triggered to generate an electromagnetic noise from the electric device. An operating state informing means for informing an abnormal state is provided.

According to another aspect of the present invention, the control device separately detects the current component of the electric motor into a torque component current and an excitation component current, and when the torque component current is zero or a value close thereto, The exciting current is increased so that the volume of electromagnetic noise from the electric motor can be recognized by humans.

Further, according to another aspect of the present invention, an abnormal state of equipment such as insufficient battery capacity and overheating of a power converter or an electric motor, a shift lever position state such as forward (D) or reverse (R), and vehicle speed. In an electric vehicle that reports an overspeed condition in which the speed is above the speed limit and an unsafe driving condition such as a half-door or seat belt not being attached, electromagnetic noise from the electric motor is reported as a sound effect sound such as a melody or a message. is there.

[0011]

In order to achieve the above object, a shift lever position state such as forward and backward movement, an overspeed state of an electric vehicle speed, an unsafe driving state such as a half door and a device abnormal state such as a low battery capacity are detected, Capture as an electrical signal. Then, by using the detection signal as a signal of tact, the pulsating component of the electric current of the electric motor is changed by changing the switching frequency of the power element that constitutes the power converter, and various electromagnetic noises from the electric motor due to the electric current pulsation are changed. The above-mentioned state is notified by playing the sound by replacing it with a sound having the tone color effect of.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a battery as an electric power source, 2 is a power converter including a power element 20, 21 is a current detector, 22 is a converter temperature sensor, 3 is an electric motor for driving an electric car, 31 Is an encoder for detecting the speed of the electric motor 3, 30 is an electric motor temperature sensor, 4 and 5 are reduction gears and wheels of an electric vehicle, 6 is an electric component such as an accelerator 60 and a brake 61, and 7 is a power converter 2. It is a control device that operates.

FIG. 2 is a functional block diagram of the electrical component 6 and the control device 7. In the electric component 6, 62 is a shift lever position for forward (D), reverse (R), parking (P), etc., 63 is a battery monitoring means for monitoring the remaining capacity and density of the battery 1, and 64 is a speed of an electric vehicle. Speed monitoring means, 65
Is a safety device monitoring means for monitoring half-doors, forgetting to lock the doors, seat belt not started, etc. In the control device 7, 700 is a torque component current generating means for generating a torque component current It of the electric motor 3 in response to a signal from the accelerator 60, 710.
720 is an excitation current generator that generates an excitation current Im.
Is a vector calculation means for calculating the primary current I1 from the torque distribution current It and the excitation distribution current Im, 730 is a primary frequency generation means for outputting a primary frequency signal sinω1 from the torque distribution current It and the speed of the motor, and 740 is a multiplication means. , 750 is the electric motor 3
760 is a current control means of the power converter 2 is Pulse Width
It is a triangular wave generating means for generating a carrier wave signal for Modulation (hereinafter referred to as PWM) control.

Further, the reference numeral 780 outputs a peak value signal 762 for controlling the peak value of the exciting component current to the exciting component current generating means 710 on the basis of the signal of the electric component 6, and also a triangular wave frequency, that is, a PWM frequency signal. It is a driving state informing means for outputting 761 to the triangular wave generating means 760.

The operation of this embodiment will be described with reference to FIG.
The torque component current It is calculated by the torque component current generation unit 700 based on the torque command 701 obtained from the output signals of the accelerator 60 and the brake 61. Further, in accordance with the speed signal obtained from the encoder 31, the excitation current generator 71
At 0, the excitation current Im is obtained. Then, the vector calculation means 720, the primary frequency generation means 730 and the multiplication means 7
40, the current command 751 is obtained. Based on this current command 751, as a feedback signal of the current detector 21,
The current control means 750 is used for the power element 20 of the power converter 2.
Is controlled by the PWM system.

Next, referring to FIGS. 3, 4 and 5,
The current pulsation of the motor will be described. As shown in FIG. 3, the power converter 2 includes six power elements 20 (UP, U
N, VP, VN, WP, WN). Current control means 75
0, the current command 751 (iu
*, iv *, iw *) and the triangular carrier wave signal 752
The WM operation is performed. Then, for example, when the current command iv * = 0 as shown in FIG. 4A, PWM operation is performed to generate the gate drive signals for the power elements 20UP, VP, WP as shown in FIG. This signal causes pulsating U, V, and W-phase currents as shown in FIG. 5 to flow through the power elements 20 by the switching operation. This current pulsation is the frequency of the triangular wave, that is, P
It is synchronized with the WM frequency (cycle tPWM1, tPWM2). By the way, when the PWM frequency is 10 kHz, the pulsating cycle of the current is 20 kHz, which is doubled. After point to in FIG. 5, PWM
When the frequency is doubled, the pulsating cycle of the current is also doubled as shown in FIG.

The electric motor 3 generates an electromagnetic noise due to the electromagnetic vibration of the stator or the rotor core by the current having the pulsating component of the PWM frequency component in the primary frequency.

Therefore, by changing the PWM frequency, the frequency component of the electromagnetic sound, that is, the tone color can be changed. Further, since the electromagnetic vibration also increases as the current increases, the volume of the electromagnetic sound can be changed by increasing / decreasing the current.

Furthermore, by varying the frequency component of the electromagnetic sound, it is possible to generate a scale "Doremifasolacid", that is, a tone color. That is, if the PWM frequency is fixed, a single electromagnetic sound (hereinafter referred to as a single sound) is generated, and by combining the single sounds, an electromagnetic sound having a melody (hereinafter referred to as an acoustic sound) is generated. Can be made.

As shown in FIG. 6, the operating condition informing means 780 is composed of a detecting means 781, an exciting current peak value varying means 782 and a current pulsation varying means 783. The detection means 781 is a shift lever position such as forward (D) or neutral (N) from the shift lever 62,
Information on the battery state such as the density from the battery monitoring unit 63, the vehicle speed overspeed state from the speed monitoring unit 64, and the seat belt forgetting state information from the safety device monitoring unit 65 is received and detected. Also, the magnitude of the command motor current is detected from the torque command 701. Further, the temperatures of the electric power converter 2 and the electric motor 3 are detected from the respective temperature sensors 22 and 30.

Excitation current peak value varying means 782 outputs a peak signal 762 of the excitation current, based on the detected signal 784 of the command motor current. The feature of this means is that the command motor current is small when judged from the torque command 701 when the amount of depression of the accelerator 60 is small, that is, the motor 3
When the volume of the electromagnetic sound generated from the is low, the peak value of the exciting current that is not directly related to the drive torque of the electric motor 3 is increased to increase the volume of the electromagnetic sound. The current pulsation varying means 783 outputs the PWM frequency signal 761 which is varied based on the variable command signal 785. That is, current pulsation is generated based on the information from the electrical component 6 and the temperature sensors 22 and 30 to produce a predetermined single sound or acoustic sound according to the operating state.

For example, when the shift lever 62 is in the operating state as shown in the combination of Table 1, the PWM frequencies corresponding to the single tones P1 to P4 or the PWM frequencies corresponding to the acoustic tones PW1 to PW4 are generated. In the remaining capacity of the battery 1,
Alternatively, if there is a problem with overheating of the electric motor 3 or the power converter 2, if P5 to P7 or PW5 to PW7 is detected by the speed monitoring device 64 as the vehicle speed being higher than the speed limit, then P8
Alternatively, the PW8 is a half door by the safety device detecting means 65,
When forgetting to lock the door or not engaging in seat belt is detected, P9 to P11 or PW9 to PW11 is generated. here,
As a single sound, a sound with a frequency selected in a single range from the range of the PWM frequency of 400 Hz to 900 Hz or several times higher is considered. The acoustic sound can be a sound in which frequencies of a single sound are combined. By varying the PWM frequency in this way, the electric motor 3 can generate a single sound, an acoustic sound, or an electromagnetic sound composed of a voice message.

Furthermore, the current pulsation changing means 783 is
It is composed of a plurality of data tables as shown in FIG. The PWM frequency generation table 786 is
As shown in Fig. 8, (a) (b)
(c) A table for setting which electromagnetic sound of a program of the kind shown in (d) is generated. Single tone table 7
In 87, the PWM frequency data of P1 to P11 in Table 1,
The acoustic sound table 788 includes PW1 to PW11 PW in Table 1.
The melody data, which is a combination of M frequency data,
It is stored. Then, the PWM frequency generation table 7
The digital / analog converter (D / A) according to the PWM frequency data selected according to the operating condition by the command of 86.
A PWM frequency conversion signal 761 is issued via 789.

[0025]

According to the present invention, the operating condition of the electric vehicle
Detecting from electrical components and using the signal as a signal to vary the current pulsation of the electric motor, the electromagnetic noise with a timbre effect is played from the electric motor to notify the operator, ensuring the safety of the driver and those near the electric vehicle. You can do it.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric vehicle controller showing an embodiment according to the present invention.

FIG. 2 is a functional block diagram of an electric vehicle control device showing an embodiment according to the present invention.

FIG. 3 is a configuration diagram of a power element of a power converter.

FIG. 4 is an explanatory diagram of a PWM control operation.

FIG. 5 is an explanatory diagram of current pulsation of an electric motor.

FIG. 6 is a functional block diagram of an operating state informing means showing an embodiment of the present invention.

FIG. 7 is a functional block diagram of a current pulsation changing means showing an embodiment of the present invention.

FIG. 8 is an explanatory diagram of types of electromagnetic sounds to be generated.

[Table 1] A table for explaining combinations of operating states and types of electromagnetic noise.

[Explanation of symbols]

2: Power converter, 3: Electric motor, 6: Electrical component, 7: Control device, 60: Accelerator, 62: Shift lever, 63: Battery monitoring means, 64: Speed monitoring means, 65: Safety device monitoring means, 710: Excitation current generator, 760: Triangle wave generator, 780: Operating state notification device, 781: Detection device, 782: Excitation current peak value changing device, 783: Current pulsation changing device, 786: PWM frequency generation table, 7
87: single tone table, 788: acoustic tone table

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[Procedure amendment]

[Submission date] January 10, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric vehicle controller showing an embodiment according to the present invention.

FIG. 2 is a functional block diagram of an electric vehicle control device showing an embodiment according to the present invention.

FIG. 3 is a configuration diagram of a power element of a power converter.

FIG. 4 is an explanatory diagram of a PWM control operation.

FIG. 5 is an explanatory diagram of current pulsation of an electric motor.

FIG. 6 is a functional block diagram of an operating state informing means showing an embodiment of the present invention.

FIG. 7 is a functional block diagram of a current pulsation changing means showing an embodiment of the present invention.

FIG. 8 is an explanatory diagram of types of electromagnetic sounds to be generated.

FIG. 9 is a diagram illustrating a combination of an operating state and a type of electromagnetic sound.

[Explanation of Codes] 2: Power Converter, 3: Electric Motor, 6: Electrical Equipment, 7: Control Device, 60: Accelerator, 62: Shift Lever, 63: Battery Monitoring Means, 64: Speed Monitoring Means, 65: Safety Device Monitoring means, 710: Excitation current generation means, 760: Triangular wave generation means, 780: Operating state informing means, 781: Detection means, 782: Excitation current current peak value changing means, 783: Current pulsation changing means, 786: PWM frequency Occurrence table, 7
87: single tone table, 788: acoustic tone table

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 8]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 9]

Claims (7)

[Claims] 1. An electric vehicle control device for driving and driving an electric vehicle, comprising: an electric motor; an electric power converter for supplying electric power to the electric motor; and a control device for controlling the electric power converter. An electric vehicle control device comprising: a driving state notifying means for notifying the driving state by an electromagnetic sound from the electric motor, triggered by a signal for detecting the state. 2. The electric vehicle control device according to claim 1, wherein the driving state informing means is forward (D) or reverse (R).
And an electric vehicle control device configured to notify a shift lever position state such as parking (P). 3. The electric vehicle control device according to claim 1, wherein the operating state notifying means is configured to notify an overspeed state in which the speed of the electric vehicle is equal to or higher than a speed limit. Electric vehicle controller. 4. The electric vehicle control device according to claim 1, wherein the operating condition notifying means is configured to notify a non-safe driving condition such as a half-door, forgetting to lock the door, or not wearing a seat belt. An electric vehicle control device characterized by the above. 5. An electric vehicle control device for driving and driving an electric vehicle, comprising an electric motor, a power converter for supplying electric power to the electric motor, and a control device for controlling the power converter, wherein a battery of the electric vehicle is provided. Insufficient capacity and triggering a signal that has detected an abnormal device condition such as overheating of the power converter or the electric motor, and an electromagnetic noise from the electric motor is provided to provide an operating condition notification means for notifying the abnormal device condition. A characteristic electric vehicle control device. 6. An electric vehicle control device for driving and driving an electric vehicle, comprising an electric motor, a power converter for supplying electric power to the electric motor, and a control device for controlling the power converter, wherein the control device comprises: The current component of the electric motor is detected by dividing it into a torque component current and an excitation component current, and when the torque component current is zero or a value close to it, the excitation component current is increased to increase the volume of the electromagnetic sound from the electric motor. An electric vehicle control device, characterized in that the electric vehicle control device is constituted by means for making the volume recognizable by a person. 7. An equipment abnormal state such as insufficient battery capacity and overheating of a power converter or an electric motor, a shift lever position state such as forward (D) or reverse (R), an overspeed state in which a vehicle speed is equal to or higher than a speed limit, and An electric vehicle characterized by notifying a non-safe driving state such as a half-door, seat belt not attached, etc., by giving an electromagnetic sound from the electric motor as a sound effect sound such as a melody or a message.