JPH0729684Y2 - Motor drive control device for electric vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a motor drive control device for an electric vehicle, and in particular, is configured to drive and control two vehicle motors separately using the same battery. The present invention relates to a motor drive control device for an electric vehicle.

[Conventional technology]

2. Description of the Related Art Conventionally, two rear wheels included in an electric vehicle are individually driven by drive motors provided separately.

FIG. 3 shows a conventional example. The conventional example shown in FIG. 3 has a reference signal output section 30 for outputting a reference signal V ₁ (see FIG. 4).
And a left rear wheel speed control section 31 and a right rear wheel speed control section 32 which respectively output motor control signals V ₂ and V ₃ having a predetermined duty ratio at the timing of the output V ₁ of the reference signal output section 30.
And one motor drive circuit 33 for the left rear wheel that is activated by the motor control signals V ₂ and V ₃ output from the left and right rear wheel speed control units 31 and 32, and the right rear wheel. And the other motor drive circuit 34 for use with. Code 35,3
6 indicates a drive motor, respectively.

The left and right motor drive circuits 33, 34 that operate in conjunction with the accelerator can appropriately drive the corresponding drive motors 35, 36. Reference numeral 40 indicates a DC power source such as a battery.

[Problems to be solved by the invention]

However, in the above conventional example, since the motor control signals V ₂ and V ₃ are formed based on the same timing of the same reference signal V ₁ , the drive motors 35 and 36 for driving the rear wheels are formed. The timings of the energizing currents are in the same phase.
This means that the energizing current I _R of the energization current I _L and the other drive motor 36 of one drive motor 35 is the same phase as shown in Figure 4. Therefore, each of these motors 3
From the DC power supply 40 constituting the power supply of 5,36, large load current I _B of the ripples and the electric current I _L and I _R of the right and left formed by simple synthesis is outputted. Therefore, the DC power supply 40 is in a high-rate discharge state, and radio noise having a relatively large power is radiated to the surroundings to cause radio wave pollution.

[Purpose of device]

The present invention improves the disadvantages of the conventional example, and particularly, when driving and controlling a plurality of drive motors using a DC power supply, effectively controls output of a load current with a small ripple, and thereby, It is an object of the present invention to provide a motor drive control device for an electric vehicle that can effectively suppress the occurrence of radio wave pollution caused by traveling.

[Means for solving problems]

In the present invention, a plurality of motor drive circuits separately provided for a plurality of drive motors for an electric vehicle, a plurality of speed control circuits for individually controlling the operation of each motor drive circuit, and a plurality of speed control circuits And a reference signal output section for sending an operation reference signal.

Further, a reference signal phase shift circuit is provided between the other speed control circuit of the speed control circuits and the aforementioned reference signal output section.

Each of the speed control circuits described above operates in conjunction with an accelerator that is pre-installed in the electric vehicle, and an output voltage setting variable resistor, and a voltage and a reference signal set by the output voltage setting variable resistor. A configuration is adopted in which an operation reference signal from an output unit is input and a control comparator that outputs a control voltage signal for the motor drive circuit is separately provided. This aims to achieve the above-mentioned object.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Here, the same reference numerals are used for the same components as those of the above-mentioned conventional example.

The embodiment shown in FIG. 1 includes a reference signal output section 30 for outputting the reference signal V ₁ shown in FIG. 2 and an output of the reference signal output section 30.
Left rear wheel speed control circuit 31 which outputs motor control signals V ₂ and V ₃ each having a predetermined duty ratio at the timing of V ₁
And a right rear wheel speed control circuit 32, and one motor for the left rear wheel that is activated by being urged by motor control signals V ₂ and V ₃ output from the left and right rear wheel speed control circuits 31 and 32. A drive circuit 33 and the other motor drive circuit 34 for the right rear wheel are provided.

Between the right rear wheel speed control circuit 32 and the reference signal output unit 30,
The reference signal phase shift circuit 1 is provided.

Reference numerals 35 and 36 denote drive motors respectively connected to the rear wheels of the electric vehicle, and reference numeral 40 denotes a battery as a DC power source for the motors.

The reference signal output unit 30 is the first operation amplifier 30A.
Astable multivibrator circuit 30B
And a second reference signal V ₁ is sent to the left rear wheel speed control circuit 31 based on the output of the first operation amplifier 30A.
It has a configuration with the operation amplifier 30C of.

The left rear wheel speed control circuit 31 inputs a variable resistor R ₁ as an output voltage setting variable resistor which is linked to an accelerator and a voltage V ₅ which is changed by the operation of the variable resistor R ₁ to a positive terminal and outputs a predetermined voltage. It is configured to include one control comparator 31A that outputs the control signal V ₂ .

Further, the right rear wheel speed control circuit 32 inputs the variable resistor R ₂ as an output voltage setting variable resistor linked to the accelerator and the voltage V ₃ which changes by the operation of the variable resistor R ₂ to the negative terminal. It has a configuration including a other control comparator 32A outputs a predetermined control signal V _4.

One motor drive circuit 33 for the left rear wheel is composed of a power transistor 33A that performs a switching action, and a backflow prevention diode 33B that is provided in parallel with this power transistor 33A. Of these, the power transistor 33A
Are connected in series to the armature of the motor 35.

Further, the other motor drive circuit 34 for the right rear wheel is formed in the same manner as the one motor drive circuit 33 for the left rear wheel described above,
The power transistor 34A and the backflow prevention diode 34A are provided.

In the present embodiment, the phase shift circuit 1 for the reference signal is the first operational amplifier 30 of the reference signal output section 30 described above.
Reverse the output of A (shift the phase by 180 °)
The inverter 2 and the phase shift operation amplifier 3 for sending the voltage signal V ₃ shown in FIG. 2 to the negative terminal of the comparator 32A of the right rear wheel speed control circuit 32 based on the output of the inverter 2 are provided.

Next, the overall operation of the above embodiment will be described.

First, the first operation amplifier of the reference signal output section 30
The second operational amplifier 30B, which received the output of 30A,
A voltage signal composed of a triangular waveform as shown by V ₁ in FIG.
It is sent to the comparator 31A of the left rear wheel speed control circuit 31. On the other hand, the phase shift operation amplifier 3 of the phase shift circuit 1 receives the output of the first operation amplifier of the reference signal output section 30 described above via the inverter 2 and receives the triangular waveform indicated by V ₃ in FIG. To the comparator 32A. In this case, the voltage signals V ₁ and V ₂ have a relationship of “V ₁ = V ₂ ”, that is, a voltage waveform in which V ₂ has a 180 ° phase delay with respect to V ₁ as a reference, as shown in FIG.

Next, the comparator 31A of the left rear wheel speed control unit 31 inputs the output signal V ₁ from the reference signal output unit 30 to its negative terminal, compares it with V ₅ , and compares it with the voltage signal shown in FIG. V ₂ is output to one motor drive circuit 33. Then, in one of the motor drive circuits 33, when the control signal V ₂ is “high”, the motor drive circuit 33 is turned “ON” to drive the drive motor 35.
At this time, the load current I _L shown in FIG.
Flows.

In this drive motor 35, the high-level time t ₁ of the control signal V ₂ is long, the energization time is long, and the rotation speed is increased at the same time.

On the other hand, the comparator 32A of the right rear wheel speed control circuit 32
Also, the comparator 31A of the left rear wheel speed control circuit 31 described above.
Works the same as. In this case, the motor 36 is supplied with a load current I _R having a phase that is 180 ° out of phase with the load current I _L described above, as shown in FIG.

Therefore, the full load current I _B flowing out of the battery 40 is
As shown in FIG. 2, the waveform has a remarkably small ripple.

As described above, according to the above-mentioned embodiment, there are the following advantages.

． Set the phase between the load currents I _L and I _R for the drive motor to 180
° so that the full load current flowing out of the battery 40
I _B is the pulsation width can be reduced, thus, it has become a radio wave radiation noise is greatly reduced.

． The smaller ripple reduces the depth of pulse discharge to the battery and reduces power loss.

In the case of 0.3 or more, the same effect can be obtained by applying a reference wave having a phase difference of [360 ° / n], where n is set.

Here, in the above embodiment, each speed control circuit 31, 32
The duty ratio of the control signals V ₂ and V ₄ output from
Although the case of [%] is exemplified, each drive motor is individually driven and controlled by the operation of each speed control circuit by an accelerator signal independently output via each motor drive circuit described above. Therefore, if the duty ratio of the control voltage signal for the motor drive circuit is 0 to 50
It can be expanded significantly without limiting between%.
In this case, the ripple of the current waveform is increased to some extent, but it can still be suppressed sufficiently smaller than in the case of the conventional example.

Although the reference signal phase shift circuit 1 has a phase shift of 180 °, the phase shift angle is not necessarily 180 °. Further, another phase shift circuit may be used to shift in small steps as needed. Further, in the above embodiment, especially the drive motor is
Although the case of using the number of three is exemplified, the above-mentioned respective components may be provided separately for three or more and the phases of the control signals may be sequentially shifted.

[Effect of device]

Since the present invention is constructed and functions as described above, according to this, the phase of the load current supplied to one drive motor with respect to the load current supplied to the other drive motor is set to the phase shift circuit for the reference signal. It is possible to shift by a certain amount by the action, and on the other hand, since the shifted load currents are simultaneously output from the same DC power supply, the combined load current output from the DC power supply has a large variation range of its ripple. It becomes possible to suppress the occurrence of radio noise reliably and effectively, and each speed control circuit is
Input the output voltage setting variable resistor that operates in conjunction with the accelerator equipped in advance in the electric vehicle, and the voltage set by the output voltage setting variable resistor and the operation reference signal from the reference signal output section. And a control comparator that outputs a control voltage signal for the motor drive circuit, respectively. Therefore, each drive motor is individually and independently output via each motor drive circuit described above. The drive ratio can be individually controlled based on the above, and therefore, the duty ratio of the control voltage signal for the motor drive circuit described above can be greatly expanded without being limited to 0 to 50%. While effectively suppressing noise generation, the output control range of each drive motor can be set to a larger value than the conventional one in accordance with the size of the load. It is possible to provide a motor drive control apparatus for a good electric vehicle unprecedented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the operation of FIG. 1, FIG. 3 is a block diagram showing a conventional example, and FIG. 4 is a block diagram showing FIG. It is an explanatory diagram showing an operation. 1 ... Reference signal phase shift circuit, 30 ... Reference signal output section, 31 ... Left rear wheel speed control circuit, 31A, 32A ... Control comparator, 32 ... Right rear wheel speed control circuit, 33, 34 ...... Motor drive circuit, 35,36 …… Drive motor, R ₁ , R ₂ …… Variable resistors for setting output voltage.

Claims (1)

[Scope of utility model registration request] 1. A plurality of motor drive circuits provided separately for a plurality of drive motors for an electric vehicle, a plurality of speed control circuits for individually controlling the operation of each motor drive circuit, and each speed control circuit. In a motor drive control device for an electric vehicle, which includes a reference signal output section for sending an operation reference signal to the reference signal output section between the other speed control circuit of the speed control circuits and the reference signal output section. Equipped with a phase shift circuit for use in output, and each of the speed control circuits is set in advance by an output voltage setting variable resistor that operates in conjunction with an accelerator that is pre-installed in the electric vehicle, and this output voltage setting variable resistor. And a control comparator for receiving the operation reference signal from the reference signal output section and outputting a control voltage signal for the motor drive circuit, respectively. Electric vehicle motor drive control apparatus.