JPH1141706A - Electric automobile having engine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the occurrence of the operation inability for a motor controller by voltage drop when an engine starter is operated, by providing a switch between a DC-DC converter and a control battery, and obtaining the control electric power of a motor controller between this switch and the DC-DC converter. SOLUTION: A switch 11 is provided between a DC-DC converter 4 and a control battery 5. Then, a generation controller 10 outputs the operation signal to an engine starter 7 after an OFF signal is outputted to the switch 11 and outputs the ON signal after the operation of the engine starter 7. At this time when the switch 11 is ON, a main battery 1 supplies control power supply to a motor controller 2 through the DC-DC converter 4, charges the control battery 5 and supplies electric power to a vehicle electric device 6. Furthermore, when the switch 11 is OFF, the engine starter 7 is driven by the control battery 5. The DC-DC converter 4 supplies the electric power only to the motor controller 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle having an engine generator, and more particularly, to control when a control battery drops due to operation of an engine starter.

[0002]

2. Description of the Related Art In an electric vehicle, a motor is driven by electric power of a battery to drive a vehicle. For stable running of the vehicle, the battery voltage is monitored and charging is performed when the voltage drops. I have. In recent years, so-called series hybrid electric vehicles having an engine generator mounted outside a battery have appeared in order to compensate for a short charge traveling distance per charge.

FIG. 5 is a block diagram of a power supply unit of a conventional series hybrid electric vehicle. A motor 3 is driven by a main controller 1 via a motor controller 2 while the main battery 1 is located at the center. Is DC-
The control battery 5 is charged via the DC converter 4, and the control battery 5 is a control power source for the motor controller 2 and a power source for the vehicle electrical components 6 and the engine starter 7. Further, the engine 8 is driven by the driving of the engine starter 7, the generator 9 starts generating electric power, the electric power is charged to the main battery, and the motor 3 is driven via the motor controller 2. Note that the engine starter 7, the engine 8, and the generator 9 are
Is controlled by

[0004]

In the above configuration,
The engine 8 is started according to the decrease of the main battery 1 or stopped according to the state of charge.
When the engine is started, the engine starter 7 is operated. In this operation, a large current flows, so that the terminal voltage of the control battery 5 temporarily drops. On the other hand, when the control voltage of the control battery 5 for controlling the motor controller 2 is temporarily reduced for the above-described reason, the control circuit detects the decrease of the control voltage and stops the gate of the controller 2 when the voltage drops, and Prevents the device from being destroyed.
As a result, if the gate of the motor controller 2 is stopped based on the voltage drop during the operation of the starter, the motor 3 is stopped by the stop of the motor controller 2 and the vehicle cannot run when the engine is running. Was.

The present invention has been made in view of the above problems, and has as its object to provide an electric vehicle having an engine generator capable of avoiding an inoperable state of a motor controller even when an engine starter is operated.

[0006]

The present invention that achieves the above object has the following matters specifying the invention. (1) In an electric vehicle that supplies power from a main battery that drives a motor via a motor controller to a control battery via a DC-DC converter and drives a starter of an engine generator with the control battery, A switch that is turned off while on is provided between the DC-DC converter and the control battery,
The control power of the motor controller is obtained from between the DC converter and the switch. (2) Power is supplied from a main battery that drives a motor via a motor controller to a control battery via a DC-DC converter, and the control battery drives a starter of an engine generator and supplies control power to the motor controller. In the electric vehicle supplying the DC,
A first switch is provided between the DC converter and the control battery, and a second switch is provided between the control battery and the motor controller; and the motor controller is controlled from between the DC-DC converter and the first switch. Providing power, turning on the second switch and turning off the first switch while the DC-DC converter is off,
After turning on the DC-DC converter, the starter is driven to turn on the first switch.

When the engine starter is started, the main battery, the DC-DC converter 4 and the control battery 5 are disconnected and the control power of the motor controller is obtained from the DC-DC converter. Does not affect the control voltage of the motor controller.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an example and FIG.
The same reference numerals are given to the same parts as those described above, and the description thereof is omitted. In this example, a switch 11 for turning on and off a connection between the DC-DC converter 4 and the control battery 5 is provided.
And the DC-DC converter 4 and the switch 11
The control power of the motor controller 2 is taken from between the steps. In general, in an electric vehicle, DC-DC
The capacity of the converter 4 is larger than the control power supply capacity of the motor controller 2, so that the motor controller 2 operates sufficiently only by the power supply of the DC-DC converter 4 regardless of whether the switch 11 is on or off.

Thus, while the switch 11 is on,
The control power of the motor controller 2 is obtained from the DC-DC converter 4 connected to the main battery 1, and the control battery 5 is charged to supply power to the vehicle electrical components 6. When the switch 11 is turned off, the engine starter 7 is driven by the control battery 5, and the DC-DC converter 4
Supplies power only to the motor controller 2.

The turning on and off of the switch 11 is controlled by a control signal from the power generation controller 10 and adopts the timing shown in FIG. That is, an off signal of the switch 11 is output from the power generation controller 10 and then an operation signal of the engine starter 7 is output.
Is output and the signal is restored. Thus, the engine 8 can be started without causing a control voltage drop of the motor controller. In FIG. 1, the motor controller 2 and the power generation controller 10 are separated from each other in the description, but a single controller may be used. In this case, the operation is as described above.

FIGS. 3 and 4 show another embodiment of the present invention. The same parts as those in FIGS. 5 and 1 are denoted by the same reference numerals. As the switch 11 shown in FIG. 1, a relatively large switch (relay or MC) that can cut off the current from the DC-DC converter 4 is required, and the price depends on the magnitude of the current when cutting off the current. It becomes expensive, and the case where the current is cut off and the case where it is not turned off are markedly different. Therefore, as shown in FIG. 3, a first switch 12 is provided between the DC-DC converter 4 and the control battery 5, and a second switch 13 is also provided in a control circuit between the control battery 5 and the motor controller 2. Equipped, and DC-DC
A short circuit is established between the converter 4 and the first switch 12 and between the second switch 13 and the motor controller 2. Then, a control signal is output from the power generation controller 10 to the DC-DC converter 4, the first switch 12, and the second switch 13. Here, the switch is 2
Although the number of switches increases as compared with the example of FIG. 1, since a large current is not cut off, a small switch can be used as a whole.

FIG. 4 shows a timing chart.
The following operation is performed according to a control signal from the power generation controller 10. First, when operating the engine generator due to a decrease in battery voltage, an ON signal of the second switch 13 is output from the power generation controller 10 and the second switch 13 is turned on. After that, the DC-
The operation of the DC converter 4 is stopped. At this time, DC-D
A control signal is output from the control battery 5 to the motor controller 2 via the second switch 13 without current flowing out of the C converter 4. Therefore, the first
In the switch 12, almost no current flows, and the first switch 12 is turned off. Thereafter, the DC-DC converter 4 is restored and turned on, and with the second switch 13 turned off, the engine starter 7 is turned on to drive the generator. Then, control power is supplied from the DC-DC converter 4 to the motor controller 2. After the operation of the engine starter 7, the first switch 12 is turned on to return to the original state. In this way, the control power of the motor controller 2 is temporarily supplied by the second switch 13, the first switch 12 is turned off with a very small current, and the engine starter 7 is driven by DC- It is separated from the DC converter 4.

[0013]

As described above, according to the present invention, in the series hybrid electric vehicle, the control power supply of the motor controller when the engine starter operates is DC-DC.
Since the power is supplied only by the converter, it is possible to avoid the motor controller inoperable state.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of an embodiment of the present invention.

FIG. 2 is a timing chart of FIG.

FIG. 3 is a block diagram of another example.

FIG. 4 is a timing chart of FIG. 3;

FIG. 5 is a block diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main battery 2 Motor controller 3 Motor 4 DC-DC converter 5 Control battery 7 Engine starter 8 Engine 9 Generator 10 Generator controller 11 Switch 12 First switch 13 Second switch

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H02J 7/00 H02J 7/00 P 7/14 7/14 A // H02M 3/00 H02M 3/00 H

Claims (2)

[Claims] An electric vehicle that supplies power from a main battery that drives a motor via a motor controller to a control battery via a DC-DC converter, and drives a starter of an engine generator with the control battery. When the starter is on, turn off the switch.
An electric vehicle including an engine generator provided between a DC converter and the control battery, wherein control power of the motor controller is obtained from between the DC-DC converter and the switch. 2. A power supply is supplied from a main battery that drives a motor via a motor controller to a control battery via a DC-DC converter, and the control battery drives a starter of an engine generator and transmits the power to the motor controller. An electric vehicle for supplying control power, wherein a first battery is provided between the DC-DC converter and a control battery.
A switch, and a second switch between the control battery and the motor controller, wherein the DC-DC
Applying control power to the motor controller from between the converter and the first switch, turning on the second switch to turn off the first switch while the DC-DC converter is off, and turning on the DC-DC converter after turning on the DC-DC converter; An electric vehicle having an engine generator that drives a starter to turn on the first switch.