JP2879486B2 - Braking and auxiliary power units for internal combustion engines - Google Patents

Abstract

PURPOSE:To start an internal combustion engine even if charge of an electrostatic capacity becomes zero by connecting a storage battery to an electrostatic capacity of an inverter for converting energy through a step-up and step-down transformer between a squirrel-cage polyphase induction machine coupled directly to the engine and a DC circuit formed of the capacity. CONSTITUTION:Electric energy is bilaterally transmitted by AC/DC- or DC/AC- converting it by an inverter 4 connected between a squirrel-cage polyphase induction machine 2 coupled directly to an internal combustion engine 1 and an electrostatic capacity circuit 20 for forming a DC side. An inverter controller 5 controls the inverter 4 according to a rotating speed of the engine 1, a voltage of the circuit 20 and a current of a semiconductor switch circuit 12. At the time of braking, the machine 2 generates to charge the circuit 20. When auxiliary power is DC/AC-converted to drive the machine 2. A storage battery 22 having a small capacity is connected in parallel with the circuit 20 through a step-up and step-down converter 21. Thus, even when charge of the circuit 20 is zero, the engine 1 is easily started, and a power source is reduced in weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention converts mechanical energy generated when braking an internal combustion engine into electric energy and accumulates the same, and assists the accumulative electric energy when accelerating the internal combustion engine. It is used for a device that generates mechanical energy by supplying it to the device. The present invention is used in a device in which a rotating cage type polyphase induction machine is connected to a rotating shaft of an internal combustion engine, and the cage type polyphase induction machine acts as a generator during braking and acts as a motor during acceleration. The present invention relates to HIM
This device is suitable for mounting on a vehicle equipped with an auxiliary acceleration and auxiliary braking device sold by the present applicant under the name of R.

[0002]

2. Description of the Related Art The applicant of the present invention has published International Publication WO 88/88.
No. 0617 (International Application No. PCT / JP / 00157) discloses an electric braking and auxiliary acceleration device for a vehicle. As shown in FIG. 7 , this device has a squirrel-cage polyphase induction machine 2 whose rotor is directly connected to an internal combustion engine 1, a secondary battery circuit 3 as a power storage means, and a direct current (DC) of the secondary battery circuit 3. The voltage is converted into an AC voltage having a frequency suitable for inducing a rotating magnetic field having a rotation speed lower than the shaft rotation speed of the cage type polyphase induction machine 2, and the converted voltage is applied to the cage type polyphase induction machine 2. Inverter circuit 4 for converting AC power from the multi-phase induction motor 2 into DC power, and an inverter control circuit 5 for generating a control signal for setting the frequency of the AC side voltage of the inverter circuit 4
And The inverter control circuit 5 includes means for generating a control command by a driver in accordance with driving of the vehicle.

A rotation sensor 6 is attached to the cage type polyphase induction machine 2, and a signal from the rotation sensor 6 is given to an inverter control circuit 5, and furthermore, a secondary battery relating to the state of charge of the secondary battery. Information from the circuit 3 is input.

A capacitor 7 and a semiconductor switch circuit 12 are connected to the output side of the inverter circuit 4, and a resistor 11 is connected through the semiconductor switch circuit 12.
The resistor 11 is configured to dissipate excessive electric energy that cannot be regenerated due to a large braking applied to the vehicle.

Further, a detection circuit 13 for detecting the output voltage of the inverter circuit 4 is connected to the secondary battery circuit 3 and the semiconductor switch circuit 12, and a resistor 11 is provided with a current detector 15 for detecting a change in current. Can be This current detector 15 is connected to a switch control circuit 14 for controlling the semiconductor switch circuit 12 according to the detection signal.
The detection circuit 13 is connected to the switch control circuit 14.

This device is mounted on an automobile, recovers energy generated by braking when the automobile is braked as electrical energy, and stores the electrical energy. When the automobile accelerates, the stored electrical energy is converted into mechanical energy, and the axle is driven. This is to provide auxiliary power to the driving internal combustion engine.

In other words, the control circuit for controlling the inverter is such that in the acceleration mode in which the squirrel-cage polyphase induction machine is used as an auxiliary power unit for the internal combustion engine, the squirrel-cage polyphase induction machine applies a rotating magnetic field having a speed exceeding the rotation speed of the internal combustion engine. A deceleration mode in which the squirrel-cage polyphase induction machine is used as a braking device for an internal combustion engine and includes means for controlling its inverter circuit so as to apply a rotating magnetic field to the squirrel-cage polyphase induction machine at a speed lower than the rotation speed of the internal combustion engine. . In addition, the inverter circuit supplies the DC output of the electric energy stored in the power storage means as a polyphase AC output to the cage type polyphase induction machine in the acceleration mode, and outputs the polyphase AC output energy of the cage type polyphase induction machine in the deceleration mode. Includes circuit means for providing a DC output to the storage means.

In such a conventional device, the power storage means is a storage battery. In other words, the rated voltage on the DC side of the inverter is 200 to 300 V, and a storage battery having this rated voltage is used by connecting many lead-acid batteries for automobiles in series.

The applicant has designed and manufactured a practical device for the above-mentioned device, and has adopted it as a regular bus mainly operating in an urban area on a trial basis and has been able to perform many tests.

[0010]

From the results of this test,
The above-mentioned device is an extremely useful device that can be effectively recovered and used without simply dissipating the energy generated during braking. In the future, it will be applicable not only to large vehicles but also to passenger cars and small trucks. Although excellent performance it has been found that it comes to mounting tower large lead-acid batteries in practical automobile, 10 lead-acid batteries of 24V in ○ volumetrically rather larger ...... specifically About 0.2 to 0.4 m ² because it is used after being connected in series. ○ The weight of the vehicle increases.
kg. ○ To extract DC power of several tens of amperes at a voltage exceeding 200 V, it is necessary to equip a mounting structure with appropriate safety equipment for the human body .... Specifically, an open / close door is provided. It is necessary to install safety equipment in a solid box and automatically shut off the circuit when the door is opened. ○ Since lead-acid batteries are devices that involve a chemical reaction, Maintenance such as replenishing or replenishing the electrolyte by measuring the specific gravity by observing the amount is required .... The maintenance work is increased and the application to private cars becomes difficult. Must be concentrated in one place in order to achieve a simple structure ..... a space is not taken up for a small car. ○ There is an energy loss due to the internal resistance of the battery .... The energy recovered during braking is accelerated. It cannot be used efficiently. ○ Under normal operating conditions, the current storage capacity cannot be detected electrically accurately enough to be used for automatic control .... By measuring the specific gravity of the electrolyte, It is possible to know the storage capacity fairly accurately, but with a simple ammeter or voltmeter, if there is a temperature change, the above internal resistance will change and the accuracy will not always be sufficient, and this will be used as real-time control information. Not in a form that can be
It turned out that there were issues such as.

As a solution to the above-mentioned problems, the present inventor has proposed to use an electrostatic capacity circuit (capacitor) for the electric storage means and has come to carry out a test. The device utilizing the capacitance circuit for the electric storage means is described in detail in another patent application filed by the same applicant with the present application. The outline is that, as an example that can be realized, an electric double layer capacitor is used as a unit capacitor, a large number of these capacitors are connected in series, and a plurality of the series circuits are connected in parallel.
This is to obtain a capacitance circuit of about 00V and a capacitance of about 20F. Then, it has been disclosed that by using this capacitance circuit, it is possible to assist for about 25 seconds with respect to power of about 160 A at a maximum voltage of 200 V at a maximum voltage of 200 V.

By the way, when a test is performed using such an apparatus,
If this device is not used for a very long time, the charge in the capacitance circuit may self-discharge. When the device is manufactured and used for the first time, the same applies because no charge is stored in the capacitance circuit. In a state where little electric charge is stored in the capacitance circuit, the internal combustion engine cannot be started.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a device which can start an internal combustion engine rationally even when the stored charge in the capacitance circuit is almost exhausted. I do.

[0014]

According to the present invention, there is provided a capacitance circuit directly connected to a DC side of an inverter circuit as a storage means, and a DC side voltage connected to the DC side via a step-up / down converter. A lower voltage storage battery is provided.
The step-up / step-down converter is controlled by the control circuit. The control mode of the control circuit includes an initial charge mode in which the capacitance circuit steps up and converts the energy of the storage battery by the step-up / step-down converter and charges the capacitor circuit. A start mode in which the energy stored in the circuit is supplied to the cage-type polyphase induction machine as an alternating current through the inverter circuit as an alternating current, and the cage-type polyphase induction machine is operated as an electric motor, and the cage-type polyphase induction machine is generated when the vehicle is braked. A deceleration mode in which the output alternating current of the squirrel-cage polyphase induction machine is operated as a charging current via an inverter circuit as a charging current, and a squirrel-cage polyphase induction machine is operated as an electric motor when the vehicle is accelerating. An acceleration mode in which energy stored in the capacitance circuit is supplied as an alternating current to the cage-type polyphase induction machine via the inverter circuit.

Further, in addition to the above modes, the control circuit of the present invention operates the squirrel-cage polyphase induction machine as a generator during the warm-up operation of the internal combustion engine following the starting mode. A warm-up mode in which the output AC current of the machine is supplied as a charging current to the capacitance circuit via the inverter circuit, and a car which operates when the terminal voltage of the capacitance circuit falls below a predetermined value during operation of the internal combustion engine. And a supplementary charging mode in which the squirrel-shaped polyphase induction machine is operated as a generator and the output alternating current of the squirrel-shaped polyphase induction machine is supplied as a charging current to the capacitance circuit via the inverter circuit. .

It is convenient that the terminal voltage of the storage battery is a terminal voltage equal to the rated voltage of the various electric equipment of the automobile (current standard is 24 V or 12 V).

The step-up / step-down converter is, as one example, a converter in which a chopper circuit and a reactor circuit are connected.

[0018]

According to the structure of the present invention, the storage battery (e.g., a battery) equipped with this device can be used immediately after the device is manufactured or when the device has not been used for a long time and there is almost no charge stored in the capacitance circuit. (Terminal voltage 24V or 12V), and the energy of this storage battery can be used.

In the initial charge mode, the terminal voltage of the storage battery is generated using a step-up / step-down converter to generate a high pulse-like voltage, and a certain amount of charge is stored in the capacitance circuit.

In the starting mode, the squirrel-cage polyphase induction machine is operated as an electric motor using the electric charge stored in the initial charging mode to start the internal combustion engine.

When the internal combustion engine starts rotating by itself, electric power is taken out from the cage type multi-phase induction machine, and the electric charge is further stored in the capacitance circuit. It is desirable that special control be performed as the warm-up operation mode. In this warm-up operation mode, the capacitance circuit reaches the rated terminal voltage.

At this point, the vehicle is ready to run. In the acceleration mode, the electric charge stored in the capacitance circuit is released to use the squirrel-cage polyphase induction machine as auxiliary power. The stored electric energy is stored in the capacitance circuit.

If the amount of charge stored in the capacitance circuit becomes smaller than the specified value due to excessive use of the acceleration mode, the control mode is set to the supplementary charging mode, and the squirrel-cage polyphase induction machine is operated as a generator. When the internal combustion engine is rotating, the stored charge amount of the capacitance circuit can always be maintained at a specified value or more.

In this device, the storage battery having a low terminal voltage can be controlled to generate a low voltage by controlling the step-up / step-down converter and maintain the charged state when there is a sufficient amount of charge stored in the capacitance circuit. I can do it. The rechargeable battery may not necessarily be charged by this method, but may be charged by using an alternator conventionally provided in an internal combustion engine.

In the configuration using the alternator as described above, the above-mentioned step-up / step-down converter can be a simple step-up converter. A DC converter can be used.

[0026]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention,
FIG. 2 is a block diagram showing a configuration of a step-up / down converter and an inverter circuit according to the embodiment of the present invention. FIG. 3 is a diagram showing a configuration example of a capacitance circuit according to the embodiment of the present invention.

In the embodiment of the present invention, a cage-type polyphase induction machine 2 whose rotor is directly connected to an internal combustion engine 1 and a rotation of a rotation speed lower than the shaft rotation speed of the cage-type polyphase induction machine 2 by applying a DC voltage. An inverter circuit 4 for converting an AC voltage having a frequency suitable for inducing a magnetic field, applying the AC voltage to the cage-type polyphase induction machine 2, and converting AC power from the cage-type polyphase induction machine 2 to DC power; And an inverter control circuit 5 for generating a control signal for setting the frequency of the AC side voltage of the inverter circuit 4.
And The inverter control circuit 5 includes means for generating a control command by a driver in accordance with driving of the vehicle.

A rotation sensor 6 is attached to the cage type polyphase induction machine 2, and a signal from the rotation sensor 6 is given to an inverter control circuit 5, and further information on the state of charge is input.

The capacitor 7 and the semiconductor switch circuit 12 are connected to the output side of the inverter circuit 4, and the resistor 11 is connected through the semiconductor switch circuit 12.
This resistor 11 dissipates excessive electrical energy that cannot be regenerated due to heavy braking applied to the vehicle.

Further, a detection circuit 13 for detecting the output voltage of the inverter circuit 4 is connected, and the resistor 11 is provided with a current detector 15 for detecting a change in current. This current detector 15 is connected to a switch control circuit 14 for controlling the semiconductor switch circuit 12 according to the detection signal. The detection circuit 13 is connected to the switch control circuit 14.

Further, as a feature of the present invention, a capacitance circuit 20 directly connected to the DC side of the inverter circuit 4 and a DC / DC converter of the inverter circuit 4 connected to the capacitance circuit 20 via a step-up / down converter 21 The step-up / step-down converter 21 is controlled by the inverter control circuit 5, and the control mode of the inverter control circuit 5 is such that the capacitance circuit 20 when the internal combustion engine 1 is stopped.
Charge mode, in which the energy of the storage battery 22 is boosted and converted by the step-up / down converter 21 and charged, and the energy stored in the capacitance circuit 20 when the internal combustion engine 1 is started is converted into a cage-shaped polyphase through the inverter circuit 4. A start mode in which the squirrel-cage polyphase induction machine 2 is operated as an electric motor by supplying it to the induction machine 2 as an alternating current, and an output of the squirrel-cage polyphase induction machine 2 is operated when the car is braked. A deceleration mode in which an alternating current is supplied as a charging current to the capacitance circuit 20 via the inverter circuit 4; and an energy stored in the capacitance circuit 20 by operating the squirrel-cage polyphase induction machine 2 as an electric motor during acceleration of the vehicle. Mode in which AC is supplied to the cage type polyphase induction machine 2 via the inverter circuit 4 as an AC current, and the cage type polyphase induction machine 2 is operated as a generator during the warm-up operation of the internal combustion engine 1 A warm-up mode in which the output AC current of the squirrel cage type polyphase induction machine 2 is supplied as a charging current to the capacitance circuit 20 via the inverter circuit 4, and a terminal voltage of the capacitance circuit 20 during operation of the internal combustion engine 1. Is reduced to a predetermined value or less, the cage-type polyphase induction machine 2 is operated as a generator, and the output AC current of the cage-type polyphase induction machine 2 is supplied to the capacitance circuit 20 via the inverter circuit 4 as a charging current. And a supplementary charging mode. The terminal voltage of the storage battery 22 is set to the rated voltage of the standard electric equipment of the vehicle.

As shown in FIG. 3, the capacitance circuit 20 includes 150 unit capacitors C ₁ , C ₂ ,... C ₁₅₀ having the same capacitance (500 F, 2 V). Series circuits connected in series are further connected in parallel in six rows, and a total of 900 capacitors are arranged.

Further, each of these capacitors has a resistance R ₁ , R ₂ , R ₃ ,.
₁₅₀ are connected in parallel and 6
The columns are connected and arranged.

The reason why the resistors are arranged as described above is that even if each capacitor has the same standard capacitance, there is a slight variation due to manufacturing tolerances. , A difference occurs in the terminal voltages generated at the terminals. In order to prevent this, a resistor having little variation in manufacturing is connected in parallel for each capacitor so as to make the terminal voltage generated as uniform as possible.

In this example, as described above, 900 capacitors and resistors are used, respectively. However, when these are arranged on a plane, they have an area and volume of about one tatami mat. However, since it is possible to disperse and dispose the group of capacitors and resistors in an unused space in the vehicle in a state of being electrically connected, the active space is not narrowed, and the battery of the conventionally used battery is not reduced. It can be extremely lightweight when compared to its weight.

In the above example, the capacitor and the resistor are 90
Although the number is zero, the number is not necessarily limited and can be set arbitrarily according to each vehicle type.

As a specific example, a commercially available electric double layer capacitor has a withstand voltage of 2 V and a capacitance of 500 F.
00V, and when six circuits are connected in parallel, the capacitance becomes about 20F.

Since the withstand voltage is 300 V, the rated voltage is 2
When used at 00 V, the rated charge is 200 V × 20 F = 4000 coulombs (= ampere seconds), and the maximum current is 160 A according to the current inverter.
Therefore, 4000 coulombs / 160 amps = 25 seconds, and auxiliary power can be given for about 25 seconds with respect to electric power of maximum voltage 200V and maximum current 160A.

Next, the normal operation of the embodiment of the present invention thus configured will be described.

First, when a braking force is generated in the rotating system, the inverter control circuit 5 generates a rotating magnetic field having a speed lower than the rotating speed of the rotor of the cage type polyphase induction machine 2 detected by the rotation sensor 6. A control signal is generated so as to be given to the stator section of the cage type multi-phase induction machine 2. At this time, the cage-type polyphase induction machine 2 operates as a generator, and the generated electric energy is converted into DC energy by the inverter circuit 4 and supplied to the capacitance circuit 20 as a charging current. When the braking torque is large and the capacitance circuit 20 cannot absorb this DC energy, the DC terminal voltage rises beyond a predetermined value, and the semiconductor switch circuit 12 detects this and detects the terminal of the capacitance circuit 20. To close the resistor 11.

On the other hand, when the driving force is applied to the rotating system, the inverter control circuit 5 generates a rotating magnetic field having a speed higher than the rotating speed of the rotor of the cage type polyphase induction machine 2 detected by the rotation sensor 6. A control signal is generated so as to be given to the stator section of the cage type multi-phase induction machine 2. At this time, a DC current is extracted from the capacitance circuit 20, converted into a polyphase alternating current corresponding to the rotating magnetic field by the inverter circuit 4, and supplied to the cage type polyphase induction machine 2.

Here, the larger the difference between the rotation speed of the rotating magnetic field and the shaft rotation speed, the larger the brake torque and the driving force. In this embodiment, the ratio between the difference and the rotation speed of the rotating magnetic field, that is, the slip of the cage type polyphase induction machine 2 is approximately ±
It is set to be in the range of 10%.

Next, control of charging the capacitance circuit 20 will be described. The inverter circuit 4 is supplied with a control signal from the inverter control circuit 5 for applying a rotating magnetic field corresponding to the rotation of the rotor to the stator of the squirrel-cage polyphase induction machine 2. The inverter control circuit 5 includes a rotation sensor 6
, And information regarding the state of charge of the capacitance circuit 20 is input. The inverter control circuit 5 includes a microprocessor. In addition, the inverter control circuit 5 includes a unit that captures an operation control signal that changes depending on a driving condition by a driver's operation.

As described above, the inverter circuit 4 can supply the energy of the DC terminal to the AC terminal, and can also supply the energy generated in the AC terminal to the DC terminal. Further, the rotation speed of the rotating magnetic field is controlled by the control of the inverter control circuit 5 so that the squirrel-cage polyphase induction machine 2 becomes an electric motor, and a driving force is applied to the rotating shaft of the squirrel-cage polyphase induction machine 2 to provide an internal combustion engine. It can be operated as one auxiliary driving device. At this time, the electric energy charged in the capacitance circuit 20 is used.

The charging of the capacitance circuit 20 is performed by the internal combustion engine 1.
As long as the internal combustion engine 1 is rotating, the generator is connected to the engine and the charging energy is used by the operation of the starting motor or the operation of various outfitting devices. Is controlled so as to reach the charging state.

Next, the charge / discharge control of the capacitance circuit 20 in the embodiment of the present invention will be described. FIG. 4 is a diagram showing a flow of control of charging and discharging of the capacitance circuit in the embodiment of the present invention.

Immediately after the device is manufactured or when the device has not been used for a long time and there is almost no charge stored in the capacitance circuit 20, the initial charging mode is selected and the minimum voltage is set by the step-up chopper of the step-up / step-down converter 21. 150V
Charged until (). When the start mode is selected and the internal combustion engine 1 is started by this voltage, the voltage becomes about 100 V
().

When the internal combustion engine 1 starts and enters a warm-up operation state, the warm-up mode is selected, the squirrel-cage multi-phase induction machine 2 starts power generation, electric charges are stored in the capacitance circuit 20, and the rated voltage is 35.
It reaches 0V (). As a result, the vehicle is in a runnable state, the acceleration mode is selected to release the electric charge stored in the capacitance circuit 20, or the deceleration mode is selected to run with the cage-type polyphase induction machine 2 as auxiliary power. ().

At this time, if the acceleration mode is used for a long time, the voltage drops, but if the voltage falls below the minimum limit voltage set at about 230 V, the selection of the acceleration mode is prohibited. When the minimum limit voltage is reached, the control mode is switched to the supplementary charging mode, and the squirrel-cage polyphase induction machine 2 is operated as a generator to slowly charge the capacitance circuit 20 (). As described above, while the internal combustion engine 1 is rotating, the stored charge amount of the capacitance circuit 20 is always maintained at a specified value or more. Thereafter, similar control is repeated.

FIGS. 5 and 6 are flowcharts showing the flow of the control operation of the inverter control circuit in the embodiment of the present invention. Referring to FIGS. 5 and 6 will be described in more detail a control operation of the inverter control circuit 5.

When the key switch is set to the ON state,
Capacitor voltage V _c of the capacitive circuit 20 determines whether or 150V, charging if 150V or less to select an initial charge mode to operate the step-up chopper.
If 150V to stop operation of the boost chopper, the rotational speed N _E of the engine 1 determines whether exceeds 350 rpm.

[0052] does not exceed the 350rpm, to determine the connecting and disconnecting of the key switch start, return to determine whether or not processing the internal combustion engine 1 is again the rotational speed N _E if the start-up state is greater than 350rpm. Rotational speed N _E of the engine 1 the internal combustion engine 1 is to perform the cranking of the key switch was put to be in the activated state returns the process to determine whether or not exceeds 350 rpm.

[0053] rotational speed N _E of the internal combustion engine 1 in this determination is 3
If it exceeds 50 rpm, the cranking operation by turning on the key switch is stopped, and the warm-up charge mode is selected in the warm-up operation state. Then, it is determined whether the capacitor voltage V _c of the boost buck converter 21 is greater than 230V,
Select replenishment charging mode if 230V or less by operating the cage polyphase induction machine 2 as a generator, it is determined whether the capacitor voltage V _c is greater than 350 V. If it does not exceed, it returns to the power generation operation in the supplementary charge mode and returns
Repeat until V is reached. If the voltage exceeds 350 V, the power generation by the cage-type polyphase induction machine 2 is stopped.

[0054] Then, the accelerator voltage is determined whether or not the assist starting voltage or more, even the voltage V _c long assist start voltage or it is determined whether or not exceed 200V. If it does not exceed 200 V, control is returned to the process of determining whether or not the accelerator voltage is equal to or higher than the assist start voltage, and if it exceeds, the driving assist mode can be selected. In the drive assist mode, the energy stored in the capacitance circuit 20 is applied to the squirrel-cage polyphase induction machine 2 via the inverter circuit 4 to provide an assist torque for driving assistance. Thereafter, similar control is repeated.

[0055] If the accelerator voltage is less assist start voltage, and determines whether or not the accelerator voltage is idle voltage, if not idle voltage, the voltage V _c is 15
It is determined whether the voltage is 0 V or less.

If the voltage is equal to or more than 150 V, the control is returned to the processing for determining whether or not the accelerator voltage is equal to or more than the assist start voltage. If 150V or less and select replenishment charging mode, it is determined whether the capacitor voltage V _c exceeds the 230V, than the accelerator voltage unless the control on whether the determination process whether it assist start voltage higher return. If the voltage exceeds 230 V, the power generation by the cage-type polyphase induction machine 2 is stopped.

If it is determined that the accelerator voltage is the idle voltage, it is determined whether or not the switch of the squirrel-cage polyphase induction machine 2 is in the ON state. If the switch is in the ON state, the supplementary charging mode is selected. capacitor voltage V _c is regeneration stop voltage 40
It is determined whether the voltage exceeds 0V. If so, control is performed so as not to exceed the voltage, and the above-described processing operation is repeated. Furthermore, does not exceed setting the operating lever position of the squirrel-cage polyphase induction machine 2 to a position which satisfies the capacitor current I _c, thereafter repeat the above-mentioned processing operations.

[0058] If the switch cage polyphase induction machine 2 is not in the ON state, the rotational speed N _E of the engine 1 is 700rpm
Determining whether exceeds performs replenishment charging if exceeded, it is determined whether the capacitor voltage V _c is less than 400V, stop the power generation if 400V or less, 400
If it exceeds V, control is returned to the process of determining whether or not the accelerator voltage is equal to or higher than the assist start voltage, and thereafter, the same processing operation as described above is repeated.

[0059] rotational speed N _E of the internal combustion engine 1 is 700rpm
If less, switched to idling power generation mode, it is determined whether the capacitor voltage V _c is not less than 230V,
If the voltage is 230 V or less, the control is returned to the original state, and if the voltage exceeds 230 V, the power generation by the cage-type polyphase induction machine 2 is stopped.

[0060]

As described above, according to the present invention, it is possible to reduce the weight of a power supply for an automobile and to improve the efficiency of use of electric energy. it can. In addition, maintenance is not required because an electrostatic capacitance circuit is used. Therefore, distributed arrangement and sealing in an insulating structure become possible, and safety to a human body is ensured. Further, it is possible to accurately and in real time know the amount of stored power by detecting the voltage.

Further, even when the stored electric charge is almost exhausted in the capacitance circuit, the internal combustion engine can be started.
This has the effect of preventing improper supply of braking and auxiliary power that occurs with the abolition of the large storage battery.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of a step-up / step-down converter and an inverter circuit according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration example of a capacitance circuit according to the embodiment of the present invention.

FIG. 4 is a diagram showing a flow of control of charging and discharging of the capacitance circuit in the embodiment of the present invention.

FIG. 5 is a flowchart showing a control operation flow of the inverter control circuit in the embodiment of the present invention.

FIG. 6 is a flowchart showing a control operation flow of the inverter control circuit in the embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cage type polyphase induction machine 3 Secondary battery circuit 4 Inverter circuit 5 Inverter control circuit 6 Rotation sensor 7 Capacitor 11 Resistor 12 Semiconductor switch circuit 13 Detection circuit 14 Switch control circuit 15 Current detector 20 Capacitance circuit 21 step-up / step-down converter 22 storage battery

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60L 11/18 B60L 7/20 B60L 11/12

Claims (3)

(57) [Claims] 1. A cage-type polyphase induction machine coupled to a rotating shaft of an internal combustion engine that drives an axle, a power storage means, a polyphase AC circuit of the cage-type polyphase induction machine, and a DC circuit of the power storage means. And an inverter control circuit for controlling the inverter circuit, which converts the electric energy into a bidirectional electric energy, and an inverter control circuit for controlling the inverter circuit, wherein the power storage means is provided on the DC side of the inverter circuit. A directly connected capacitance circuit, and a storage battery connected to the capacitance circuit via a step-up / down converter and having a terminal voltage lower than the DC terminal voltage of the inverter circuit, wherein the capacitance circuit includes a unit capacitor. Are electrically connected
More series circuits connected in series are electrically connected in parallel
The step-up / step-down converter is controlled by the control circuit, and the control mode of the control circuit is to step-up convert the energy of the storage battery to the capacitance circuit by the step-up / step-down converter when the internal combustion engine is stopped. An initial charging mode for charging, and applying the energy stored in the capacitance circuit at the time of starting the internal combustion engine to the cage-type polyphase induction machine as an alternating current through the inverter circuit to provide the cage-type polyphase induction machine. A start mode for operating as an electric motor, and operating the car-shaped polyphase induction machine as a generator during braking of the car, and outputting an alternating current of the car-shaped polyphase induction machine to the capacitance circuit via the inverter circuit. A deceleration mode supplied as a charging current; and an energy stored in the capacitance circuit when the car-shaped polyphase induction machine is operated as an electric motor during acceleration of the vehicle. Braking and auxiliary power unit of an internal combustion engine which comprises a acceleration mode for supplying formic the alternating current to the cage polyphase induction machine via the inverter circuit. 2. In addition to each control mode of the control circuit,
Further, during the warm-up operation of the internal combustion engine, the cage-type polyphase induction machine is operated as a generator, and the output alternating current of the cage-type polyphase induction machine is supplied as charge current to the capacitance circuit via the inverter circuit. A warm-up mode to be supplied, and when the terminal voltage of the capacitance circuit drops below a predetermined value during operation of the internal combustion engine, the cage-type polyphase induction machine operates as a generator to operate the cage-type polyphase induction machine. And a supplementary charging mode in which an output AC current of the machine is supplied as a charging current to the capacitance circuit via the inverter circuit.
A braking and auxiliary power unit for an internal combustion engine as described. 3. The braking and auxiliary power device for an internal combustion engine according to claim 1, wherein the terminal voltage of the storage battery is a rated voltage of standard electric equipment of the vehicle.