JP3342360B2 - Electric circuit of hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the startup property under severe conditions in a cold region by providing a preliminary start electric motor driven by a preliminary low pressure battery and conducting electricity to the preliminary start electric motor instead of conducting electricity to an alternating current electric generator when an emergency switch is operated and the start operation of an internal combustion engine is done. SOLUTION: When a key switch 25 is turned on, a control circuit 5 sets a start mode and connects a high pressure battery 3 with an inverter 4, and direct current energy of the high pressure battery 3 is converted into alternating current energy by the inverter 4 to give slow rotation magnetic field which rotates at a speed below idling rotation speed to an alternating current electric generator 2. At this time, when a driver confirms that the alternating current electric generator 2 does not rotate and is not driven, an emergency switch 13 is turned on. Consequently, a low pressure direct current current from a preliminary low pressure battery 11 is conducted to a relay 15 through a relay 17, a key switch 25, and a relay 14, and a contact is changed over to on position to supply the low pressure direct current current to a preliminary start motor 12 so as to start an internal combustion engine 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for a hybrid vehicle equipped with an internal combustion engine and an AC motor generator connected to a rotating shaft of the internal combustion engine for performing auxiliary driving and auxiliary regenerative braking. The present invention relates to improving the reliability of a hybrid vehicle that travels under cold conditions or other severe conditions.
The present invention relates to a standby power supply circuit for a hybrid vehicle.

[0002]

2. Description of the Related Art The present applicant manufactures and sells a hybrid car for a large bus under the name of HIMR.
It is disclosed in WO 88/06107. The vehicle includes an internal combustion engine, an AC motor generator mechanically connected to a rotating shaft of the internal combustion engine, and further includes a high-voltage battery (voltage: 260 to 300 V). It is a device provided with an inverter circuit that performs bidirectional energy conversion with the machine. In this car,
The high-voltage battery is mounted under the lower floor of the vehicle body, and the inverter circuit is controlled by a computer control circuit in accordance with the operation.

That is, this inverter circuit is designed to control the rotation speed of the rotating magnetic field applied to the AC motor generator by computer, and when the rotation speed of the rotating magnetic field is higher than the mechanical rotation speed of the AC motor generator, The AC motor generator becomes an electric motor and supplies auxiliary power to the internal combustion engine. When the rotation speed of the rotating magnetic field is lower than the mechanical rotation speed of the AC motor generator, the AC motor generator is controlled to be a generator, performs auxiliary braking of the vehicle, and generates electric energy using a high-voltage battery. Regenerated in

Further, in this device, the AC motor generator is also used for starting the internal combustion engine. That is, at the time of starting the internal combustion engine, the inverter circuit controls the AC motor generator to apply a rotating magnetic field of about several hundred to 1,000 rpm, and starts the internal combustion engine with the electric energy stored in the high-voltage battery. .

In this hybrid vehicle, a low-voltage power supply (24 V) supplied to electric components used in the vehicle is supplied from a high-voltage battery output by a DC-DC converter (DC-DC converter).

[0006] This hybrid vehicle has a low emission gas and low noise during acceleration and deceleration, so it is a regular bus for city driving that repeatedly starts and stops, and a sightseeing vehicle that runs in a national park area where environmental protection conditions are severe. It is widely used for buses and has been well received.

[0007]

There has been a demand for using such a hybrid vehicle in severer conditions in colder and more mountainous areas. The inventors repeated the test for that. As a result of the test, it was found that the effect of the decrease in the capacity of the high-voltage battery in a low temperature state was large. For example, when climbing a mountain road from a flat ground and stopping for a long time near the low-temperature peak, the state in which the amount of energy stored in the high-voltage battery as auxiliary power is increased and the battery charge is reduced. Conceivable. As the battery charge becomes lower and the temperature becomes lower, the usable battery capacity becomes smaller. As described above, in a conventional hybrid vehicle, the internal combustion engine is designed to be started using the electric energy stored in the high-voltage battery. Attempting to start the battery further uses the battery charge, and when the high-voltage battery is exhausted, there is a concern that the starting of the internal combustion engine will be adversely affected.

Further, there may be a case where the internal combustion engine is started but the high-voltage battery is not recovered. If the vehicle is in a remote place where rescue cannot be sought even if the vehicle breaks down, the driver is dangerous and cannot touch the high-voltage battery even if there is a failure in the connection system of the high-voltage battery. Even in that case,
It must be possible to continue driving by emergency operation. That is, even if the internal combustion engine can be started, even if the high-voltage battery still does not recover, it is necessary to be able to run the automobile.

For this purpose, a low-voltage spare battery which is not used in normal times is provided, and the battery which is not used in normal times is surely charged when it becomes necessary. It is very difficult. Furthermore, the use of a spare battery may cause the driver to forget to operate a spare battery that is rarely used. If a spare battery that is rarely used is used, the driver may forget to use the spare battery and perform the same driving operation as in normal times.

The present invention has been made in view of such a background, and an object of the present invention is to improve a hybrid vehicle so that it can be used in a cold region and a mountain region. An object of the present invention is to improve the reliability of a hybrid vehicle at a low temperature. It is an object of the present invention to provide a device that can reliably start an internal combustion engine even when the high-voltage battery becomes low temperature in a state where the charge amount of the high-voltage battery becomes small due to operation. An object of the present invention is to provide a device that can continue driving an automobile even when the high-voltage battery is not recovered even after the internal combustion engine starts. An object of the present invention is to make the mounted spare battery as small as possible. An object of the present invention is to provide a reasonable charging circuit for a spare battery. An object of the present invention is to make the driving operation simple and clear when a small spare battery is provided. The present invention
It is an object of the present invention to provide an automobile in which a driver can maintain an appropriate driving state even when driving using a spare battery that is not normally used.

[0011]

SUMMARY OF THE INVENTION The present invention is characterized in that a hybrid vehicle running in a cold region or other harsh conditions can be reliably started and the reliability at low temperatures is improved.

That is, the present invention provides an AC motor generator (2) which is connected to a rotating shaft of an internal combustion engine (1) and serves as an auxiliary power unit or a regenerative braking device; a high-voltage battery (3); an inverter (4) for coupling the AC motor generator bidirectionally, and a control circuit providing a control signal to the inverter in accordance with a driving operation input (5), the control
The circuit is powered from the high voltage battery in the start mode
Starts the AC motor generator by supplying current to the generator
In an electric circuit of a hybrid vehicle including means for operating as an engine , a spare low-voltage battery (11), a preliminary starting motor (12) of the internal combustion engine driven by the spare low-voltage battery, and an emergency provided in a driver's seat Switch (1
3) and when the internal combustion engine is started in a state where the emergency switch is operated, supply of a starting current to the AC motor generator is prohibited, and the preliminary low-voltage battery is supplied to the preliminary starting electric motor. And first circuit means (relays 14, 15 and control circuit 5) for supplying current.

It is desirable that the emergency switch be a momentary switch that is turned on only while the switch is pressed and autonomously returns to the off state when not pressed.

A low-voltage generator (16), which is driven by the internal combustion engine (1) to generate a low-voltage DC current, is provided. When the emergency switch (13) is off, the output circuit of the low-voltage generator is provided. A second circuit means (relay 17) for interrupting connection between the high-voltage battery and the backup low-voltage battery (11), and a DC-DC converter (21) for outputting the low-voltage DC current using the high-voltage battery as an input power source; A back-flow prevention diode (22) is provided in a path for supplying power supply current from the DC / DC converter (21) to the main electric components essential for traveling of the vehicle, and the output of the low-voltage generator (16) is set to It is desirable to be connected to the main electrical component side (downstream side).

Further, the output of the DC / DC converter (21) is connected to the spare low voltage battery (11) for a predetermined time when the terminal voltage of the high voltage battery is normal, controlled by the control circuit (5). A charging lamp for indicating to the driver's seat that the third circuit means is effective, wherein the high-voltage battery is formed by connecting a plurality of unit batteries in series; The spare low voltage battery,
It is desirable that the unit battery is constituted by one or two series-connected batteries of the same type.

When the internal combustion engine is started when there is an abnormality in the high-voltage battery (3) or other high-voltage system, first, the driver operates the emergency switch (13). By this operation, the relay (14) constituting the first circuit means switches to the electromagnetic coil side of the relay (15) connecting the preliminary low-voltage battery (11) and the preliminary starting motor (12). Thereby, the contact of the relay (15) is turned on, and the relay (17) constituting the second circuit means is turned on.

In this state, when the key switch (25) is operated to the start position (ST) and the start of the internal combustion engine (1) is commanded, the control circuit (5) inhibits the control of the inverter (4). Thus, the supply of the starting current from the high-voltage battery (3) to the AC motor generator (2) is prohibited.

Accordingly, the low-voltage DC current from the backup low-voltage battery (11) is supplied to the preliminary start motor (12) via the relay (17) and the relay (15), and the preliminary start motor is driven to rotate and the internal combustion engine is driven. Start the engine.

When the internal combustion engine is started by this starting operation, the key switch is turned from the starting position (ST) to (ON).
And the relay (15) is turned off,
The connection between the preliminary low-voltage battery and the preliminary starting motor is cut off, and the rotational driving of the preliminary starting motor stops.

At this time, since the emergency switch (13) is still in the ON state, the terminal of the low-voltage generator (16) is switched from the backup low-voltage battery (11) via the relay (17) and the key switch (25). An exciting current is supplied to R, power is generated by the rotation of the internal combustion engine, and a low-voltage DC current is supplied from terminal B to the downstream side of the backflow prevention diode (22).
As a result, a low-voltage current is supplied to the main electrical components that are required for traveling at a minimum.

When the start of the internal combustion engine is confirmed and the hand is released from the emergency switch (13) to automatically return to the off state, the relay (14) and the relay (17) are turned off, and the spare low-voltage battery (11) And the connection with the low-voltage generator (16) is cut off.

When the terminal voltage of the high-voltage battery is in a normal state, the starting operation is not performed by the emergency switch (13) but is performed by operating the key switch (25). That is, when the key switch is operated to the start position (ST), low-voltage DC is supplied as a signal current from the relay (14) to the control circuit (5), and the inverter (4) is supplied to the AC motor generator (2). Supplies current for low-speed rotation for starting. Thereby, the internal combustion engine (1) starts.
Thereafter, the control circuit turns on the third circuit means (24) for a predetermined time, for example, two minutes, and connects the output of the DC / DC converter (21) to the backup low-voltage battery (11). After the elapse of the predetermined time, the third circuit means is turned off.
Thereby, even if the state where the spare battery is not used while the high-voltage battery is normal is long, the spare low-voltage battery is charged at the time of a normal start operation, so that the spare low-voltage battery cannot be used due to self-discharge. Can be prevented.

When the third circuit means is effective, the control circuit operates the charging lamp (26) provided in the driver's seat.
And a lighting display is provided to notify the driver that the vehicle is in a charged state.

The high-voltage battery is constituted by connecting a plurality of, for example, 25 unit batteries of 12 V in series, and the spare low-voltage battery is used by connecting one or two batteries of the same type as the unit battery in series. Accordingly, maintenance of the unit battery mounted on the vehicle can be facilitated.

With such a configuration, the internal combustion engine can be reliably started even if the charge amount of the battery is reduced when the hybrid vehicle is used in a low temperature region or a mountain region. Even if the high-voltage battery still does not recover even after the internal combustion engine starts, the operation of the vehicle can be continued, and the reliability of the hybrid vehicle at low temperatures can be improved.

Furthermore, since the charging circuit of the spare battery can be rationally configured, the size of the spare battery can be reduced as much as possible. By using the emergency switch, there is no need to operate the high-voltage circuit in an emergency, that is, when an abnormality occurs in the high-voltage battery, and the operation operation becomes extremely simple. In addition, since the start by the preliminary start motor involves the operation of the emergency switch, if the hand is released after the start, the switch is automatically turned off, and malfunction of the preliminary start motor due to forgetting to return the switch can be prevented.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION

[0028]

【Example】

(First Embodiment) Next, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention.

In the first embodiment of the present invention, an AC motor generator 2 connected to a rotating shaft of an internal combustion engine 1 and serving as an auxiliary power unit or a regenerative braking device, a high-voltage battery 3, and the high-voltage battery 3 and the AC motor generator And a control circuit 5 for providing a control signal to the inverter 4 in accordance with a driving operation input. As a feature of the present invention, a spare low-voltage battery 11 A preliminary starting motor 12 of the internal combustion engine 1 to be driven, an emergency switch 13 provided in a driver's seat, and the emergency switch 13
When the start operation of the internal combustion engine 1 is performed in a state in which the motor is operated, the supply of the starting current to the AC motor generator 2 is prohibited (in the embodiment, the inverter 4 is stopped), and the preliminary low-voltage battery is supplied to the preliminary starting motor 12. First circuit means for supplying current from 11 is provided. This first circuit means is constituted by the relay 14, the relay 15, and the control circuit 5. The emergency switch 13 is a momentary switch that is turned on only while the switch is pressed, and autonomously returns to the off state when not pressed.

A low-voltage generator 16 which is driven by the internal combustion engine 1 to generate a low-voltage DC current is provided. When the emergency switch 13 is off, the output circuit of the low-voltage generator 16 and the backup low-voltage battery 11 are connected to each other. A relay 17 which constitutes a second circuit means for interrupting the connection of the DC / DC converter, and a DC / DC converter 21 which outputs the low voltage DC current using the high voltage battery 3 as an input power source, are provided as main electric components indispensable for running of the vehicle. A backflow prevention diode 22 is provided in a path for supplying a power supply current from the DC / DC converter 21, and the output of the low-voltage generator 16 is connected to the main flow component side (downstream side) of the backflow prevention diode 22.

Further, it is controlled by the control circuit 5 and connects the output of the DC / DC converter 21 to the backup low-voltage battery 11 for a predetermined time (for example, 2 minutes) when the terminal voltage of the high-voltage battery 3 is normal. Circuit means 24 is provided, and a charging lamp 26 is provided on the driver's seat to indicate that the third circuit means 24 is effective.

The high-voltage battery 3 is configured by connecting a plurality of unit batteries in series, and the spare low-voltage battery 11 is configured by connecting one or two batteries of the same type as the unit battery.

FIG. 2 shows an example in which a momentary switch and a charging lamp according to the first embodiment of the present invention are arranged in a driver's seat.

FIG. 3 is a block diagram showing a system configuration of a hybrid vehicle according to the first embodiment of the present invention. FIG. 4 shows a state in which main components of the hybrid vehicle according to the first embodiment of the present invention are mounted on a vehicle. It is a perspective view.

According to the driving operation, the control circuit 5
An auxiliary acceleration mode in which the AC motor generator 2 is used as an auxiliary power unit of the internal combustion engine 1 and a braking mode in which the AC motor generator 2 is used for braking the vehicle are set. A rotating magnetic field at a speed exceeding the rotation speed of 1 to cause the AC motor generator 2 to operate as a motor,
In the braking mode, there is included means for applying a rotating magnetic field at a speed lower than the rotation speed of the internal combustion engine 1 to the AC motor generator 2 to control the AC motor generator 2 to operate as a generator.

In the auxiliary acceleration mode, the DC output of the electric energy stored in the high-voltage battery 3 is supplied to the inverter 4 as a multi-phase AC output to the AC motor generator 2, and in the braking mode, the output of the AC motor generator 2 is increased. Circuit means for providing the high-voltage battery 3 with the phase AC output energy as a DC output is included.

The control circuit 5 includes a rotation sensor 31 for detecting the rotation speed of the internal combustion engine 1, a detection circuit 32 for detecting the output voltage of the inverter 4, a current sensor 33 for detecting the charge / discharge current of the high-voltage battery 3, and a vehicle. The output of the vehicle speed sensor 34 for detecting the traveling speed of the vehicle is connected.

As shown in FIG. 4, the high-voltage battery 3 has a large number (eg, 25) of unit batteries connected in series and stored in a battery room provided under the floor of the vehicle.

The operation modes set by the control circuit 5 of the hybrid vehicle according to the first embodiment of the present invention include a start mode, a traveling mode, a braking mode, and an auxiliary acceleration mode.

When the control circuit 5 receives a start signal of the internal combustion engine 1 by operating the key switch 25, the control circuit 5 sets the start mode. In this start mode, the high voltage battery 3 and the inverter 4
And the inverter 4 converts the DC energy of the high-voltage battery 3 into AC energy, and gives the AC motor generator 2 a gentle rotating magnetic field having an idling rotational speed or less (for example, 200 rpm). With this rotating magnetic field, the AC motor generator 2 is driven as an electric motor to give a torque to the internal combustion engine 1. At this time, the control circuit 5 takes in the output from the rotation sensor 31 and outputs a predetermined rotation speed (for example, 300
(rpm) is determined, and if the value is exceeded, it is determined that the internal combustion engine 1 has been started and the travel mode is set.

When the driving mode is set, the control circuit 5 takes in the outputs of the accelerator stroke sensor, the brake stroke sensor (not shown), the rotation sensor 31 and the vehicle speed sensor 34 shown in FIG. It is determined whether an acceleration operation has been performed. When a braking operation is performed, a braking mode is set, and when an acceleration operation is performed, an auxiliary acceleration mode is set. When neither operation is performed, the driving mode is maintained. When the braking mode or the auxiliary acceleration mode is set by operating the operation lever provided in the driver's seat, the mode is set according to the operation input.

In the braking mode, the control circuit 5 applies a rotating magnetic field at a speed lower than the rotation speed of the internal combustion engine 1 to the AC motor generator 2 to operate the AC motor generator 2 as a generator.
Electric braking is applied to the internal combustion engine 1 and the inverter 4
And converts the generated AC electric energy into DC electric energy to perform regenerative charging of the high-voltage battery 3.

In the auxiliary acceleration mode, the control circuit 5 gives the AC motor generator 2 a rotating magnetic field at a speed exceeding the rotation speed of the internal combustion engine 1 to operate the AC motor generator 2 as a motor and control the inverter 4. Then, the DC energy of the high voltage battery 3 is converted into AC energy and supplied to the AC motor generator 2. At this time, the rotation speed of the rotating magnetic field of the AC motor generator 2 is slightly higher than the actual rotation speed, and the AC motor generator 2 operates as a motor. As a result, the driving force of the AC motor generator 2 is applied to the internal combustion engine 1 to perform auxiliary acceleration.

Next, the operation of charging the backup low-voltage battery 11 when the high-voltage battery 3 is normal according to the first embodiment of the present invention will be described. FIG. 5 is a flowchart showing the flow of the operation of charging the backup low-voltage battery by the first embodiment of the present invention.

The spare low-voltage battery 11 does not charge or discharge regardless of whether the high-voltage battery is in a normal state. But,
It is necessary to charge the amount of discharge by a self-discharge or a start test performed using the preliminary start motor 12 at the time of vehicle inspection about once a month. According to actual measurements, 5 to 6 Ah / month as a self-discharge component, and 0.2 as a start test component for inspection.
A charge of 0.5 Ah / month is required. Therefore, every time a normal start operation is performed, the backup low-voltage battery is charged for a predetermined time (about 1 to 3 minutes) in accordance with a command from the control circuit 5.

When the key switch 25 is set to the start position (ST), a signal voltage is supplied to the I / O of the control circuit 5.
As a result, the control circuit 5 enters the start mode, and the AC motor generator 2 becomes a motor and rotates at a low speed. When the internal combustion engine 1 starts, a low-voltage DC 2
4V is supplied.

In this state, the control circuit 5 sends the ground potential to the third circuit means 24 for about 2 minutes. Thus, the backup low-voltage battery 11 is charged from the output of the DC-DC converter 21 via the third circuit means 24. At this time, the charging lamp 26 is turned on, and the driver recognizes that the backup low-voltage battery 11 is being charged.

The internal combustion engine 1 is started and the key switch 25
Is operated from the start position (ST) to the (ON) position, there is no start signal to the control circuit 5, whereby the control circuit 5 cancels the start mode and sets the drive mode.

Next, the operation when the charge amount of the high-voltage battery 3 decreases and the starting by the AC motor generator 2 becomes impossible will be described.

To start the internal combustion engine 1 by the AC motor generator 2, the key switch 25 is set to the starting position (ST).
When the driver recognizes that the AC motor generator 2 is not rotationally driven, the emergency switch 13 is operated to turn it on. Next, when the key switch 25 is operated to the start position (ST), a low-voltage DC current is supplied from the auxiliary low-voltage battery 11 to the exciting coil of the relay 14, and the contacts of the relay 14 are connected to the auxiliary low-voltage battery 11 and the preliminary starting motor 12.
Is connected to the relay 15 side that connects At the same time, the low-voltage DC current from the auxiliary low-voltage battery 11 is also supplied to the exciting coil of the relay 17 constituting the second circuit means, and the contact R ₁
Is turned on. Accordingly, the spare low-voltage battery 11
Low voltage DC current from relay 17 and key switch 25
And via the relay 14 to the exciting coil of the relay 15 to turn on the contact.

When the relay 15 and the relay 17 are turned on, a low-voltage DC current is supplied from the preliminary low-voltage battery 11 to the preliminary starting motor 12, and the preliminary starting motor 12 is driven to rotate to start the internal combustion engine 1. The internal combustion engine 1 is started by this start operation, and the low-voltage generator 16 is driven to rotate. When the internal combustion engine 1 starts, the driver switches the key switch 25 to the position (ST) (ON). As a result, the current supplied to the exciting coil of the relay 15 is cut off, the relay 15 is opened, and the current supply from the auxiliary low-voltage battery 11 to the preliminary starting motor 12 is stopped.

In this state, since the emergency switch 13 is still on, the exciting current flows from the backup low-voltage battery 11 to the terminal R of the low-voltage generator 16 via the relay 17 and the (ON) terminal of the key switch 25. Electric power is generated by the supplied and rotationally driven low-voltage generator 16. The generated low-voltage DC current is supplied from the downstream side of the backflow prevention diode 22 to the main electrical components required at least for traveling.

Here, when the hand is released from the emergency switch 13, the switch is automatically turned off, whereby the relay 14 is switched to the control circuit 5 side and the relay 1 is turned off.
7 is turned off, the spare low-voltage battery 11 and the low-voltage generator 1
6 is cut off.

(Second Embodiment) Next, as a second embodiment,
A configuration in which a spare battery is not particularly provided will be described.

This configuration is similar to that shown in FIG.
1 and replace it with the ground side 24V of the high voltage battery 3.
The minute is used as a reserve low-voltage battery. That is, when no voltage is output to the high-voltage battery 3, the voltage of 24 V
When there is a cause, the portion cannot be used as a spare battery, but when there is a failure cause in other circuits, the 24 V portion on the ground side can be used as a spare battery.

FIG. 6 is a diagram showing the configuration of the main part for that purpose. The spare low-voltage battery 11 shown by a broken line in FIG. Instead, a new relay 18 is connected as shown in the figure at a position corresponding to 24 V on the ground side of the high-voltage battery.

In this circuit, when the emergency switch 13 is turned on, the earth potential of the high voltage battery 3 is grounded by the relay 18. The starting operation by the backup low-voltage battery 11 and the power generation operation by the low-voltage generator 16 are the same as those described with reference to FIG.

In this circuit, it is not necessary to separately provide a spare low-voltage battery. However, when the high-voltage battery 3 is defective, and when the cause is in the ground side and the circuit within 24 V on the ground side, it is impossible to supply the spare power. , The reliability is reduced accordingly.

[0059]

As described above, according to the present invention, when a hybrid vehicle is used in a low temperature region or a mountain region, the internal combustion engine can be reliably started even if the charge amount of the battery is reduced. In addition, even when the high-voltage battery does not recover even when the internal combustion engine is started, the operation of the automobile can be continued. As a result, the reliability of the hybrid vehicle at low temperatures can be improved.

Further, since the charging circuit of the spare battery can be rationally configured, the size of the spare battery can be reduced as much as possible. In addition, it is possible to prevent the emergency start switch from operating the pre-starting motor at normal times, and to prevent the driver from performing an erroneous operation even when the state using the spare battery occurs. Driving operation can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing an example in which an emergency switch and a charging lamp according to the first embodiment of the present invention are arranged in a driver's seat.

FIG. 3 is a block diagram showing a system configuration of a hybrid vehicle according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which main components of the hybrid vehicle according to the first embodiment of the present invention are mounted on the vehicle.

FIG. 5 is a flowchart showing a flow of a charging operation to a reserve low-voltage battery by the first embodiment of the present invention.

FIG. 6 is a partial circuit diagram showing a configuration of a main part of a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 AC motor generator 3 High voltage battery 4 Inverter 5 Control circuit 11 Preliminary low voltage battery 12 Preliminary starting motor 13 Emergency switch 14, 15, 17, 18 Relay 16 Low voltage generator 21 DC / DC converter 22 Backflow prevention diode 24 Third circuit means 25 Key switch 26 Charging lamp 31 Rotation sensor 32 Detection circuit 33 Current sensor 34 Vehicle speed sensor

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI F02N 11/04 F02N 11/04 D 11/08 11/08 L (72) Inventor Tetsuo Koike 3-chome Hinodai, Hino-shi, Tokyo No. 1 Hino Motors, Ltd. (72) Takeshi Tono 3-1, 1-1 Hinodai, Hino-shi, Tokyo Hino Motors, Ltd. (72) Norihiko Niino 3-1-1 Hinodai, Hino-shi, Tokyo No. 1 Inside Hino Motors, Ltd. (72) Inventor Kazumasa Kimura 3-1-1 Hinodai, Hino-shi, Tokyo Inside Hino Motors, Inc. (56) References JP-A-10-136508 (JP, A) JP-A-7-231507 (JP, A) JP-A-10-51907 (JP, A) JP-A-5-328530 (JP, A) JP-A-60-102471 (JP, U) JP-A-54-150031 (JP, U) Heikai 4-12 8004 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60K 6/02 F02D 29/02 B60L 11/02-11/14 F02N 11/04-11/08

Claims (5)

(57) [Claims] An AC motor generator (2) connected to a rotating shaft of an internal combustion engine (1) to serve as an auxiliary power unit or a regenerative braking device; a high-voltage battery (3); And a control circuit (5) for providing a control signal to the inverter in accordance with a driving operation input. The control circuit is configured to start the AC motor generator from the high-voltage battery in a start mode. An electric circuit for a hybrid vehicle including means for supplying an electric current to the AC motor generator to operate the AC motor generator as a starting motor, comprising: a preliminary low-voltage battery (11); (12), an emergency switch (13) provided in the driver's seat, and the alternating current when the start operation of the internal combustion engine is performed with the emergency switch operated A first circuit means for supplying a current from the pre-low battery starting current supply prohibits to the preliminary starting motor to dynamic generator (relay 14, the control circuit 5), enter the high-pressure battery Low voltage DC power supply
A DC-DC converter (21) for outputting a current , controlled by the control circuit (5), and
The output of the DC / DC converter (21) is kept at the low level for a fixed time.
Circuit means for charging by connecting to a high-voltage backup battery (11)
(24) and luck that this third circuit means is effective.
An electric circuit for a hybrid vehicle, comprising: a charging lamp for displaying a transfer seat . 2. The electric circuit of a hybrid vehicle according to claim 1, wherein the emergency switch is a momentary switch that is turned on only while the switch is pressed and autonomously returns to an off state when the switch is not pressed. 3. A low-voltage generator (16), which is driven to rotate by the internal combustion engine (1) and generates a low-voltage DC current, wherein when the emergency switch (13) is in an off state, the output of the low-voltage generator is output. The electric circuit of a hybrid vehicle according to claim 1, further comprising second circuit means (relay 17) for disconnecting a circuit from the spare low-voltage battery (11). 4. A backflow prevention diode (22) is provided in a main electric component essential for running of a vehicle in a path for supplying a power supply current from the DC / DC converter (21), and an output of the low-voltage generator (16) is provided. 4. The electric circuit of a hybrid vehicle according to claim 3, wherein said electric circuit is connected to a side (downstream side) of said main electric component of said backflow prevention diode. 5. The high-voltage battery is configured by connecting a plurality of unit batteries in series, and the spare low-voltage battery is configured by connecting one or two batteries of the same type as the unit battery. An electric circuit of the described hybrid vehicle.