JPH061925B2 - Vehicle retarder with auxiliary acceleration function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to an automobile. INDUSTRIAL APPLICABILITY The present invention is used for an automobile that uses both an internal combustion engine and an electric motor.

INDUSTRIAL APPLICABILITY The present invention is used as an electric braking device and an auxiliary accelerating device by connecting to a rotary shaft of an internal combustion engine of an automobile. The present invention relates to a squirrel cage polyphase induction machine and its control.

The present invention relates to a device that stores electric energy generated by electric braking and uses the electric energy for auxiliary acceleration.

[Conventional technology]

Internal combustion engines have been downsized due to the development and practical application of ceramics and other heat-resistant materials. When the internal combustion engine is downsized,
Exhaust brakes or engine brakes become less effective, and electric retarders must be used together. For this reason, a retarder using a generator having an eddy current generating structure or an inductor type structure has been studied and several techniques have been proposed.

[Problems to be solved by the invention]

The above-mentioned eddy current generating structure has the oldest history, and its structure is robust, but since all the energy generated during braking is dissipated as heat energy, a mechanical device with a large heat capacity is required and energy efficiency is high. It does not necessarily save fuel because it cannot be used for a long time.

A method of regenerating energy to a secondary battery by an inductor-type generator was considered, but an inductor-type generator generates a large magnetic noise when power is generated, so even if it is installed in an automobile and used. It is difficult to obtain a practical structure that satisfies users. Also, in this type, the work of the rotating part is complicated, and in order to obtain a large braking force, it is necessary to reduce the gap between the rotor and the stator to manufacture a device with small magnetic resistance, There is a drawback that the precision of the work becomes high and the device becomes unsuitable for mass production.

On the other hand, since the internal combustion engine causes environmental pollution, the development of a practical electric vehicle is desired, but in the electric vehicle equipped with an electric motor and a battery, the internal combustion engine is installed for maintenance charging and acceleration performance. Nothing is more convenient than a car.

The present invention has been made against such a background, and an object of the present invention is to provide a device that can regenerate electric power generated by braking and can use this electric power as auxiliary power of an internal combustion engine to reduce fuel consumption. And It is an object of the present invention to provide a practical device that is compact, robust, has low noise, and does not require precision machining on rotating parts.

[Means for solving problems]

The most significant feature of the present invention resides in that it is provided with a squirrel cage polyphase induction machine (I) directly connected to a main shaft of an internal combustion engine (En) that drives an axle of an automobile. The device of the present invention is
A direct current power source (E) including a secondary battery, an inverter means (In) for converting a direct current supplied from the secondary battery into a multi-phase alternating current and supplying it to a winding of a squirrel cage polyphase induction machine, and the inverter means. To the control circuit (CONT) for controlling the frequency of the polyphase alternating current by applying a control signal to the control circuit (CON) and converting the rotation speed of the squirrel cage polyphase induction machine (I) into an electric signal.
And a rotation sensor (SS) provided to T).

The control circuit (CONT) has, as its braking mode, a braking mode using a squirrel-cage polyphase induction machine as a generator and an auxiliary acceleration mode using a squirrel-cage polyphase induction machine as an electric motor.

In the braking mode, the control circuit (CONT) determines the rotation speed of the rotating magnetic field generated in the winding of the cage multiphase induction machine (I) by the multiphase alternating current as the rotation sensor (SS).
In the auxiliary acceleration mode, the rotational speed of the rotating magnetic field generated in the winding of the squirrel cage polyphase induction machine (I) is controlled by changing the frequency so that the rotational speed becomes equal to or lower than the rotational speed detected by the. A means for changing and controlling the frequency is provided so that the rotation speed is equal to or higher than the rotation speed detected by the rotation sensor (SS).

The inverter means (In) has means for converting the AC power generated in the windings of the squirrel cage multiphase induction machine (I) into DC power to regenerate the secondary battery in the braking mode. It is characterized by including.

The control circuit (CONT) includes an interface circuit (I
O), a first switch (S ₁ ) for instructing the auxiliary acceleration mode and a second switch (S ₂ ) for instructing the braking mode are connected via the interface circuit, and the control circuit ( The CONT) may be configured to include means for switching its control mode according to the operation of the first switch and the second switch.

The interface circuit includes a circuit for inputting operation information of a start key switch (KS) of the internal combustion engine, and the control circuit (CONT) has a start mode as another control mode of the above two modes. Key switch (KS)
It is possible to adopt a configuration that includes means for applying a rotating magnetic field having a rotation speed suitable for starting the internal combustion engine to the cage-type multi-phase induction machine based on the operation information.

The switch circuit (Q ₁ ) is connected to the terminal of the DC power source (E).
A circuit in which a series circuit of a resistor (R ₁ ) having a low resistance value is connected and the switch circuit (Q ₁ ) is automatically closed when the terminal voltage of the DC power source (E) exceeds a predetermined value. Means (CT ₁ ) may be provided.

[Action]

A squirrel cage polyphase induction machine is used by being connected to an internal combustion engine, and a rotating magnetic field applied to the squirrel cage polyphase induction machine is electronically controlled. The squirrel cage multi-phase induction machine is a cage having a simple structure in its rotor part, and its structure is simple and highly reliable.

The squirrel cage polyphase induction machine works as a generator when it controls the rotation speed of the rotating magnetic field so that it gives a slip in the negative direction relative to the rotation speed of the rotor. When controlled to, it becomes an electric motor and can be used as an auxiliary power unit. The cage polyphase induction machine has
The rotor part has no windings, no commutator, and the windings are limited to the stator part.

By using a composite switch element that includes a parallel connection circuit of a transistor and a diode in the inverter means, when used as a generator, rectify the multi-phase alternating current generated in the winding of the cage multi-phase induction machine into a direct current and take it out. When used as an electric motor, the current of the rotating magnetic field can be converted from a DC power supply into a multiphase AC and supplied. In order to apply a desired rotating magnetic field to the squirrel cage polyphase induction machine by controlling the inverter means, the rotation speed information of this squirrel cage polyphase induction machine is detected as an electric signal, and the negative feedback servo control is performed by this rotation speed information. To do. This makes it possible to perform control with high stability and control accuracy. Further, the control reference given to this servo control can be generated based on the driving operation and matched with the driving operation of the conventional automobile.

When the squirrel cage polyphase induction machine acts as a generator, this generated energy can be regenerated by the secondary battery in the DC power supply. However, the braking state occurs at any time along with the driving of the automobile, and the braking force of the braking state fluctuates greatly. Therefore, it is difficult to regenerate all the electric energy generated by the braking. Therefore, a discharge resistor is provided in case an excessive amount of energy that cannot be regenerated is generated.
By connecting this to a generator output with a switch circuit, a large braking force can be generated by converting a large amount of electric energy generated at a time into heat energy and dissipating it.

The discharge resistance is automatically closed when the terminal voltage of the DC power source reaches a predetermined voltage (for example, 120%) exceeding the rated terminal voltage, so that the braking energy is dissipated by the discharge resistance of the servo control. It can be independent of the lineage.

When the first switch and the second switch operated by the driver are provided, appropriate positive and negative slips can be applied to the squirrel cage polyphase induction machine in accordance with this operation to perform an appropriate driving operation.

Further, it is provided with a circuit for inputting the operation information of the start key switch of the internal combustion engine, and the program circuit generates a control reference for giving a very low rotating magnetic field suitable for starting the internal combustion engine to the squirrel cage polyphase induction machine by this operation information. By doing so, this squirrel-cage polyphase induction machine can also be used as a starting motor for an internal combustion engine.

The cage-type polyphase induction machine and the inverter means are preferably set to a high voltage in order to reduce the current of the polyphase alternating current, but the DC power supply that has been conventionally mounted on an automobile is of a considerably low voltage. is there. In order to match this, the DC power supply should be provided with a secondary battery having a relatively low voltage conventionally used and a reactor type booster circuit and a step-down circuit for converting the DC side terminal voltage of the inverter means. Is good.

〔Example〕

FIG. 1 is an electric circuit diagram of the apparatus of the present invention. The squirrel cage multiphase induction machine I is directly connected to the rotary shaft of an internal combustion engine of an automobile. More specifically, it is a structure in which a cage rotor is incorporated in a flywheel of an internal combustion engine, and a stator is attached to a flywheel housing. This detailed structure is separately filed by the same applicant as this application. DC power supply E
Inverter means In between this and the cage-type polyphase induction machine I
Are combined by. The negative terminal (E ₂ ) of the DC power supply E is connected to the common potential of this vehicle.

The inverter means In converts the direct current supplied from the secondary battery into a multi-phase alternating current and supplies it to the winding of the squirrel cage multiphase induction machine I. A control circuit CONT for applying a control signal to the inverter means In and controlling the frequency of the polyphase alternating current is provided. A portion surrounded by a one-dot chain line is a control circuit CONT, which includes a microprocessor CPU, an interface circuit IO, a digital / analog conversion circuit DA ₁ and DA ₂ and the like.

The control circuit CONT is provided with a rotation sensor SS that converts the rotation speed of the squirrel cage polyphase induction machine I into an electric signal and supplies the electric signal to the control circuit CONT. The control circuit CONT can perform servo control.

The control circuit CONT has a braking mode (the squirrel cage polyphase induction machine serves as a generator) and an auxiliary acceleration mode (the squirrel cage polyphase induction machine serves as an electric motor) as its control modes. In the braking mode, the frequency is changed and controlled so that the rotation speed of the rotating magnetic field generated in the windings of the squirrel cage polyphase induction machine I due to the polyphase alternating current becomes equal to or lower than the rotation speed detected by the rotation sensor SS, and the auxiliary In the acceleration mode, there is provided means for changing and controlling the frequency so that the rotation speed of the rotating magnetic field generated in the winding of the squirrel cage polyphase induction machine I by the polyphase alternating current becomes equal to or higher than the rotation speed detected by the rotation sensor SS.

The inverter means In includes means for converting the AC power generated in the windings of the squirrel cage multiphase induction machine I into DC power for regeneration in the secondary battery in the braking mode.

Via the interface circuit IO of the control circuit CONT,
The first switch S ₁ for instructing the auxiliary acceleration mode and the second switch S ₂ for instructing the braking mode are connected, and the control circuit CONT sets the control mode to the operation of the first switch and the second switch. Therefore, it is designed to change.

The interface circuit IO includes a circuit for inputting operation information of the start key switch KS of the internal combustion engine, and the control circuit C
In addition to the control mode, the ONT has a starting mode for starting the internal combustion engine, and applies a rotating magnetic field having a rotation speed suitable for starting the internal combustion engine to the squirrel cage polyphase induction machine I based on the operation information of the key switch KS. give.

The series circuit of the switch circuit Q ₁ and the resistor R _{1 having} a low resistance value is connected to the terminal of the DC power source E, and when the terminal voltage of the DC power source E exceeds a predetermined value, the switch circuit Q ₁ is automatically connected. Circuit means CT ₁ for closing the

This inverter means In is a switch element Qa, Qb, Qc, Qd, Qe, Q connected between each phase terminal of the squirrel cage multiphase induction machine I and the positive and negative terminals of the DC power source E.
Including f. The switch elements Qa, Qb, Qc, Qd,
Each of Qe and Qf is composed of a transistor and a diode connected in parallel in the opposite direction between the collector and the emitter of the transistor. Further, the switching means Qa, Qb, Qc,
An opening / closing control signal generation circuit PWM for giving an opening / closing control signal to the control electrodes of Qd, Qe, and Qf is included.

The inverter means In disclosed in FIG. 1 is specially designed for the automobile of the present invention, but its basic technique is known. This basic technology is applied to, for example, an AC elevator or a crane.

A rotation sensor SS is mechanically attached to the squirrel cage polyphase induction machine I, and a pulse signal output from this rotation sensor becomes an analog signal representing a rotation speed by the digital-analog conversion circuit DA ₁ . This analog signal is connected to one input of an operational amplifier AMP which is an addition control circuit. A positive or negative analog signal corresponding to the slip of the cage multiphase induction machine I is input from the digital / analog conversion circuit DA ₂ to the other input of the operational amplifier AMP. The analog signal corresponding to the slip is added or subtracted to or from the analog signal representing the rotation speed by the operational amplifier AMP. The output of the operational amplifier AMP is given to the above-mentioned switching control signal generating circuit PWM as a reference of the frequency generated by the inverter In. That is, a negative feedback servo control loop is formed by the squirrel cage multiphase induction machine I, the rotation sensor SS, the digital / analog conversion circuit DA ₁ , the operational amplifier AMP and the inverter means In.

The control circuit CONT that generates an analog signal corresponding to this slip will be described. This control circuit CONT is
Microprocessor CPU, interface circuit I
O, including a torque control circuit Tq. The interface circuit IO includes switches A ₁ and A _{2 which} are linked to the accelerator pedal of the vehicle, switches N ₁ and N ₂ which are also transmission neutral, and switches Cl ₁ and Cl _{2 which} are also linked to the clutch pedal. The first switch S ₁ to be operated, the second switch S ₂ to be operated by the driver, the switch KS that works in conjunction with the start key switch of the internal combustion engine, and the digital / analog conversion circuit DA ₂ are connected. The switch S ₃ is an exhaust brake switch that has been conventionally provided, and is connected to the exhaust brake circuit Ex.

The first switch S ₁ is a switch for instructing operation of auxiliary acceleration, and the second switch S ₂ is a switch for instructing operation of electric braking. In this embodiment, the first switch S ₁ and the second switch S ₂ are designed so that they can be operated by one operating lever 1 provided on the shaft of the handle as shown in FIG. The operating lever l is a state where the switch S ₁ and S ₂ is open both at the position OFF, the switch S ₁ is closed and put in the position of the acceleration, the position of the brake has four positions, each switch S ₂ The contact points shown in are closed in order. The four braking positions allow the driver to adjust the degree of electric braking.

When the operating lever 1 is placed in the acceleration position, the accelerator pedal depression information is given to the terminal T ₁ in FIG. 1 so that the degree of acceleration is determined by the accelerator pedal depression amount. It is configured to send a signal to the interface circuit IO.

Returning to FIG. 1, the DC side terminal E ₁ of the inverter means In
A series circuit of a DC power source E, a discharge resistor R ₁ and a switch circuit Q ₁ is connected to E ₂ and E ₂ . The switch control circuit means CT ₁ is connected to the control electrode of the switch circuit Q ₁ .

This circuit means CT ₁ is, in this embodiment, independent of the control system including the above-mentioned microprocessor CPU, and is connected to the terminal E ₁
And the voltage between E ₂ is equal to its rated voltage (here 160
When a predetermined voltage (200 V in this case) exceeding V) is reached, the switch circuit Q ₁ is turned on.
A temperature sensor H is arranged in the resistor R ₁ connected in series with the switch circuit Q ₁ , and the sensor output is input to the interface circuit IO. That is, when the temperature exceeds the set value, the amount of slip of the rotating magnetic field is reduced to weaken the braking force.

The circuit shown in FIG. 1 may be understood as a secondary battery having a rated voltage of 160V as the DC power source E. However, in this embodiment, the circuit shown in FIG. 2 was used in order to set the voltage of the secondary battery to 24V which has been conventionally used in large vehicles. Second
In the figure, terminals E ₁ and E ₂ are shown as terminals E ₁ and E _{2 in} FIG.
Connected to. The capacitor C ₁ is connected to both ends of the terminals E ₁ and E ₂ . The rated voltage of the secondary battery B is
It is 24V. A capacitor C ₂ is provided on both ends of the secondary battery B.
Are connected. A series circuit of a reactor L and a backflow prevention diode D ₂ is connected between the positive terminal of the secondary battery B and the terminal E ₁ . This reactor L and diode D ₂
Collector-emitter circuit of the transistor Q ₂ is connected between the connection point and the terminal E _2. The collector / emitter circuit of the transistor Q ₃ is connected in parallel with the diode D ₂ .

As shown in the lower half of FIG. 2, the DC power source E is provided with two comparison circuits CP ₁ , CP ₂ and a control circuit CT ₂ , and supplies control pulses to the transistors Q ₂ and Q ₃ . The transistor Q ₂ is used when the squirrel cage polyphase induction machine I operates as an electric motor. Transistor Q ₃ are used when cage polyphase induction machine I operates as a generator. The operation information of the first switch S ₁ and the second switch S ₂ described in FIG. ₁ is input to the control circuit CT ₂ . That first switch S ₁ and the second switch S ₂ is operated by the driver, when the auxiliary acceleration closed the first switch S _1, when electric braking the second switch S ₂ is closed.

When the first switch S ₁ is operated and the squirrel cage polyphase induction machine I becomes an electric motor, the control circuit CT ₂ selects the terminal Dr. By giving the control input terminal Dr of the transistor Q ₂ a very short pulse with respect to the repetition period,
The voltage of the secondary battery B is applied to both ends of the reactor L for a short time, and then a high voltage is generated. The added voltage of the voltage across the reactor L and the terminal voltage of the secondary battery is charged across the capacitor C ₁ through the diode D ₂ . The voltage across the capacitor C ₁ becomes the DC power supply voltage when the squirrel cage multiphase induction machine I operates as an electric motor. The DC power supply voltage is compared with the reference voltage Er ₂ by the comparison circuit CP _2, the pulse width and repetition period to be specified voltage is adjusted.

When the second switch S ₂ is operated and the squirrel cage polyphase induction machine I becomes a generator, the control circuit CT ₂ selects the terminal Br. The time given is repeated pulses to the control input terminal Br of the transistor Q _3, transistor Q ₃ are intermittently conductive. As a result, the closed loop of the capacitor C ₁ (terminals E ₁ and E ₂ ), the capacitor C ₂ , the reactor L, and the transistor Q ₃ is intermittently closed, and the reactor L is closed.
Energy is stored in. When the terminal voltage of the reactor L becomes higher than the terminal voltage of the secondary battery B, a closed loop is formed in the reactor L, the secondary battery B, and the diode D ₃ , and a current flows and the secondary battery B is charged. The terminal voltage of the secondary battery B, that is, the terminal voltage of the capacitor C ₂ is compared with the reference voltage Er ₁ by the comparison circuit CP ₁ .
The pulse width and repetition period are adjusted so that this terminal voltage falls within a predetermined range.

The operation modes of this device are roughly classified into three modes: power generation mode, electric mode, and stop mode. In the power generation mode, the squirrel-cage polyphase induction machine I operates as a power generator, and this mode can be further divided into two modes: a braking mode and running mode. Among these, the a braking mode is a mode when the automobile is being braked, and the cage type polyphase induction machine I
Generates a large amount of power generation energy, which is regenerated in the secondary battery B, but most of it is dissipated by the discharge resistance R. In this mode, the slip of the rotating magnetic field applied to the squirrel cage polyphase induction machine I is controlled to be negative and large.
This mode is indicated by closing the second switch S ₂ . It is controlled to generate a larger braking force by sequentially closing the steps of the second switch S ₂ .

The b running mode is a mode in which the vehicle is running steadily, and a relatively small amount of energy is generated from the squirrel-cage polyphase induction machine I to continuously and gently charge the secondary battery B. In this mode, the slip of the rotating magnetic field applied to the squirrel cage polyphase induction machine I is controlled to be negative and small. This mode is automatically entered when both the first switch and the second switch are open.

The above modes can be further classified into a auxiliary driving mode and b starting mode. Among them, the cage-type multi-phase induction machine I operates as an electric motor so that the a-auxiliary drive mode gives an auxiliary drive force to the internal combustion engine when the engine torque is required when the vehicle starts or climbs. This is because the driver operates the first switch S ₁ to control the slip amount of the squirrel cage polyphase induction machine I according to the value generated from the torque control circuit Tq according to the depression amount of the accelerator pedal. Done.

In the b-starting mode, when the internal combustion engine is started from a stopped state, the squirrel cage polyphase induction machine I tries to give a rotational force for starting, which conventionally uses a DC starting motor. It is a thing. In this case, the squirrel cage polyphase induction machine I is given a gentle rotating magnetic field of, for example, about 100 rpm. This eliminates the need for devices such as a DC starting motor, pinion gear, and magnet switch that are provided only for starting.

In this power generation mode, this device is a cage type polyphase induction machine I
Is controlled to give a negative slip, that is, a rotating magnetic field having a rotation speed smaller than the actual rotation speed of the rotor. The squirrel cage polyphase induction machine I operates as a generator, and the currents for giving the rotating magnetic field are the switching elements Qa, Qb, Qc, Q.
The electric energy generated by the cage-type polyphase induction machine I after being supplied to the cage-type polyphase induction machine I after passing through the transistor portions of d, Qe, and Qf is used as the switching elements Qa, Qb, and Q.
It is regenerated by the DC power supply E through the diode parts of c, Qd, Qe, and Qf. When a large braking force is temporarily applied and the generated energy is too large to be regenerated, the terminal voltage of the DC power source E rises and the switch circuit Q ₁
Is closed and is dissipated as heat energy by the discharge resistor R ₁ . Further, when the discharge resistance R ₁ has a continuously large value, the output of the temperature sensor H causes
Keep the device in a safe range by reducing the amount of slip of the rotating magnetic field to reduce the braking force.

In the above electric mode, the cage-type polyphase induction machine I is given a positive slip, that is, a rotating magnetic field having a rotation speed higher than the rotation speed of the rotor of the cage-type polyphase induction machine I. As a result, the squirrel cage multi-phase induction machine I operates as an electric motor, and applies a rotational force to the main shaft of the internal combustion engine directly connected thereto.

It has been found that the experimentally manufactured device of the above device can generate a driving force and a braking force of about 100 horsepower, and it is possible to design a sufficiently practical device. In this embodiment, the rotor of the squirrel cage multiphase induction machine I is mounted on the flywheel of an internal combustion engine, and the diameter of the flywheel housing is about 500 mm.

Among the parts constituting the control system of the embodiment apparatus shown in FIG. 1 described above, large parts are the inverter means In and the secondary battery B.
Is. The secondary battery B is equivalent to or slightly larger than the one conventionally mounted in an automobile and can be used practically. Regarding the inverter means In, the volume of the switching elements Qa, Qb, Qc, Qd, Qe, and Qf is large, but the device manufactured on a trial basis has a total volume of about 80 liters for a device that generates a braking force of 100 horsepower. And, it was able to be placed well under the body of the medium-duty truck. There is still room for this volume, and further miniaturization will be studied in the future. For example, the inverter means I
Since n is composed of static electric parts having no movable parts, a plurality of switch elements Qa, Qb, Qc, Qd,
It is possible to disperse and arrange Qe and Qf in different positions of one automobile, which makes it possible to design and manufacture a vehicle in a sufficiently practical form for various automobiles.

Regarding the driving performance, the arrangement of the driver's seat was taken as shown in FIG. 3 and the first switch and the second switch were operated by one operating lever l. It was found that it is possible to realize sufficiently practical driving performance without significantly changing the driving operation.

Since this device uses a squirrel cage polyphase induction machine, the structure of the rotating part is essentially simple, robust and lightweight, and no friction parts such as brushes are used. As for the gap between the rotor and the stator, in the above-mentioned embodiment, about twice as much as the conventional inductor type was manufactured, but there is no problem at all and rather a larger gap can be set. It turned out to be possible. Therefore, it was found that the work precision at the time of manufacture was relaxed and mass productivity was excellent. Also,
It was found that the magnetic noise generated from the rotor side was almost non-existent due to the cage shape, and the noise on the stator side was significantly lower than that of various conventional retarders.

Although the squirrel-cage polyphase induction machine and the inverter means are three-phase ones in the above-described embodiments, the present invention can be similarly practiced for multi-phase ones. By increasing the number of phases, the current per phase can be reduced, which is advantageous in the case of application to a small automobile in which the parts of the inverter means are dispersedly arranged in each part space of the vehicle.

〔The invention's effect〕

As described above, according to the present invention, by connecting a squirrel-cage multi-phase induction machine to a main shaft of an internal combustion engine and controlling the rotating magnetic field, an electric braking device and an auxiliary power device for a vehicle, which have not existed in the past, are provided. be able to. This device is inherently robust, has a simple structure, has no mechanically movable parts in the control system, and can be installed in a vehicle to provide a fully practical device. In addition, the rotating parts have a low working accuracy and are suitable for mass production, and since there is essentially no element that generates magnetic noise, operating noise is low. In addition, the driving performance is not so different from the operation of the conventional exhaust brake, and the driver can get used to the vehicle so that the driving performance can be sufficiently exhibited. ADVANTAGE OF THE INVENTION According to this invention, the electric power produced by braking can be regenerated, and the apparatus of small fuel consumption which can reduce and utilize this electric power as auxiliary power of an internal combustion engine can be provided, operating cost is cheap, and environmental pollution. Is also very useful for.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of the apparatus of the present invention. FIG. 2 is an electric circuit diagram of the DC power supply. FIG. 3 is a view showing the arrangement of operation levers in the driver's seat. I ... cage polyphase induction machine, SS ... rotation sensor, an In ... inverter means, E ... DC power source, R 1 _... discharge resistor.

Continued Front Page (72) Inventor Atsushi Obata 3-1-1 Hinodai, Hino City, Tokyo Hino Motors Ltd. (72) Inventor Koji Sasaki 1-1-1 Shibaura, Minato-ku, Tokyo Toshiba Corporation In the head office (72) Inventor Hiroshi Uchino No. 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corporation

Claims (4)

[Claims] 1. An internal combustion engine (En) for driving an axle of an automobile.
Cage type multi-phase induction machine (I) directly connected to the main shaft of DC, a DC power source (E) including a secondary battery, and a cage type by converting DC supplied from this DC power source (E) into multi-phase AC Inverter means (In) applied to the windings of the polyphase induction machine, a control circuit (CONT) for applying a control signal to the inverter means to control the frequency of the polyphase alternating current, and rotation of the squirrel cage polyphase induction machine (I). A retarder for a vehicle having an auxiliary acceleration function, which comprises a rotation sensor (SS) for converting a speed into an electric signal and giving it to a control circuit (CONT), wherein the control circuit (CONT) has a braking mode and an auxiliary acceleration mode. In the braking mode, the frequency is set so that the rotation speed of the rotating magnetic field generated in the windings of the squirrel cage polyphase induction machine (I) by the polyphase alternating current becomes equal to or lower than the rotation speed detected by the rotation sensor (SS). In the auxiliary acceleration mode, The frequency is controlled so that the rotation speed of the rotating magnetic field generated in the winding of the cage multiphase induction machine (I) by the phase alternating current becomes equal to or higher than the rotation speed detected by the rotation sensor (SS), and the inverter means (In ), A vehicle retarder having an auxiliary acceleration function of converting the AC power generated in the winding of the squirrel cage polyphase induction machine (I) into DC power and regenerating it to the secondary battery of the DC power supply (E). 2. A control circuit (CONT) has an interface circuit (IO), and a first switch (S ₁ ) for instructing an auxiliary acceleration mode via this interface circuit.
And a second switch (S ₂ ) for instructing the braking mode, and the control mode is switched according to the operation of the first switch and the second switch. The auxiliary acceleration according to claim (1). A vehicle retarder with functions. 3. A control circuit (CONT) has a starting mode, and an interface circuit has a circuit for inputting operation information of a start key switch (KS) of an internal combustion engine, and the operation information of the key switch (KS). A retarder for a vehicle having an auxiliary acceleration function according to claim (2), wherein a rotating magnetic field having a rotation speed suitable for starting an internal combustion engine is applied to the cage-type multi-phase induction machine by the method. 4. A direct current power source (E) has a terminal, a switch circuit (Q ₁ ) and a resistor (R) having a low resistance value at the terminal.
The series circuit of ₁ ) is connected, and when the terminal voltage of the DC power supply (E) exceeds a predetermined value, this switch circuit (Q
Vehicle retarder with an auxiliary accelerating function described in the scope paragraph (1) of claims having circuit means for closing the ₁₎ (CT _1).