JPH06257451A - Controller of turbocharger provided with rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent adverse effect on auxiliary machines in charging of a consumed battery after a rotary electric machine attached to a turbocharger is driven. CONSTITUTION:A parallel circuit composed of a relay 7 and a FET 6 is connected to a circuit between a battery 2 serving as a power supply in motor- driving of the rotary electric machine 1 of a turbocharger 10 and a charging generator 5. When the battery 2 wherein the charged amount is decreased is charged by motor-driving the rotary electric machine 1, the passing current is controlled by the PWM control of the PET 6 while monitoring the generated voltage by a voltage sensor 51, thereby the voltage supplied into the auxiliary machine4 4 is prevented from being decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a turbocharger with a rotating electric machine, which prevents adverse effects on auxiliary machinery due to a voltage drop of a battery due to a large current during electric driving of a rotating electric machine mounted on a turbocharger.

[0002]

2. Description of the Related Art In recent years, a turbocharger that uses exhaust energy to increase supercharging air pressure to an engine has been widely used. A rotary electric machine that serves as a motor-generator is attached to a turbine shaft of a turbocharger of this type. , The electric drive of the rotating electric machine is performed according to the operating condition of the engine to increase the boost pressure at low speed and high load to improve the engine torque,
Alternatively, when the exhaust energy at a high speed has a margin, attempts have been made to cause the rotating electric machine to generate electric power and use the output as electric power for charging the battery.

When the rotating electric machine is electrically driven to increase the torque at low speed of the engine as described above, a large current of 4 to 5 kW flows from the battery to the rotating electric machine, and during that period, the battery terminals are as shown in FIG. Since the voltage drops and the illuminance of lights decreases, in order to prevent this, the patent application No. 2 of 1991 was applied.
No. 84047 is a turbocharger with a rotating electric machine that is provided with a resistor and a relay in a circuit between a battery and a charging generator and supplies the output of the charging generator to auxiliary devices such as lights to suppress voltage change. A control device has been filed.

[0004]

In the proposal of the above-mentioned patent application, when charging the battery that is consumed during the electric drive of the rotating electric machine, the current is limited by the resistance to prevent the voltage drop of the charging generator. However, this resistor requires a capacity of about 100 W, and as a result, it becomes large in size and its lifetime becomes a problem.

The present invention has been made in view of the above problems, and an object thereof is to provide a control device for a turbocharger with rotating electricity, which intends to solve the conventional drawback by using a semiconductor control element for controlling a large current. To provide.

[0006]

To achieve the above object, according to the present invention, a rotary electric machine is attached to a turbocharger for collecting exhaust energy and increasing intake pressure of an engine, and the battery mounted on the rotary electric machine. In a control device for a turbocharger with a rotating electric machine that is electrically driven by supplying power from an opening / closing means for opening / closing a circuit between the battery and a generator for charging the battery, and a semiconductor switching element connected in parallel with the opening / closing means, Control means for controlling the opening / closing means to open during the electric drive of the rotating electric machine, energizing the auxiliary machinery from the generator, and reducing the charging current by the semiconductor switching element for charging the battery whose electric charge is reduced by the electric drive. There is provided a control device for a turbocharger with a rotating electric machine, including:

[0007]

When the battery whose electric charge is reduced by the electric drive of the rotary electric power is charged, the output of the charging generator is current-controlled by the PWM control of the semiconductor switching element, so that the voltage drop of the generated output is suppressed. Obstacles to aircraft are prevented.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a control device for a turbocharger with rotating electricity according to the present invention. In FIG. 1, reference numeral 10 is a turbocharger, and a turbine shaft thereof is provided with a rotating electric machine 1 that is electrically or electrically operated. Installed.

When the electric power from the battery 2 mounted on the vehicle is converted into AC electric power having a predetermined frequency by the power unit 3 and supplied to the rotating electric machine 1, the compressor coupled to the turbine shaft is driven, and the compressor is operated by the compressed air. It increases the supercharging air pressure to the engine and increases the engine torque. When the engine is rotating at a high speed and there is enough exhaust energy, the rotating electric machine 1 generates electric power to convert turbine torque into electric power, which is used as a charging power source for the battery 2 and a power source for the auxiliary machinery 4. .

Reference numeral 5 denotes a generator (ACG) which is driven by the engine torque and supplies electric power to the charging power source of the battery 2 and the auxiliary equipment 4, and a voltage sensor 51 for detecting the terminal voltage of the generator is attached and the detection signal is It is guided to the controller described later.

6 is a high current switching FET,
Reference numeral 7 is a relay, which is connected in parallel to the circuit between the battery 2 and the generator 5, and both of which open and close in response to a command from the controller 8. In particular, the FET 6 is capable of fine current control by PWM control. is there.

The controller 8 comprises an electronic control unit,
Arithmetic processing and predetermined control processing are performed based on the input signal to issue a control command to the power unit 3, the FET 6, the relay 7, and the like.

Next, the operation of this embodiment having the above-mentioned structure will be described. When the rotary electric machine 1 is not electrically driven, the relay 7 is closed and the power of the generator 5 charges the battery 2. The auxiliary equipment 4 is energized.

On the other hand, when the electric drive of the rotary electric machine 1 is required, the relay 7 and the FET 6 are instructed to perform the disconnection control, and the rotary electric machine 1 is supplied with the electric power from the battery 2 through the power unit 3. The auxiliaries 4 are energized with the output of the generator 5 to prevent the influence of the voltage drop of the battery 2.

Next, when the battery 2 is charged by the output of the generator 5 after the completion of the electric drive, a large current flows through the battery 2 whose amount of stored electricity is reduced by discharging, and the generated voltage drops, so the voltage sensor While monitoring the generated voltage by 51, the FET 6 is chopped by PWH control,
The charging current is controlled to secure the supply voltage to the auxiliary machinery 4. Therefore, at the time of electrically driving the rotating electric machine 1 or at the beginning of charging the battery 2 after electrically driving, a decrease in the supply voltage to the auxiliary machines 4 is prevented. Although the present invention has been described with reference to the above-described embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0016]

According to the present invention as in the above embodiments,
When electrically driving a rotating electrical machine that requires a large amount of power from a battery, disconnect the relay to energize auxiliary machinery from the generator,
When the battery is charged by electric drive, the current is controlled by chopping control of the FET while monitoring the output voltage of the generator, so a large-capacity resistor is not required and the supply voltage to the auxiliary machinery is always stable. It is possible to prevent deterioration of illuminance of headlights etc.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a control device for a turbocharger with a rotating electric machine according to the present invention.

FIG. 2 is a curve diagram showing an example of changes in battery terminal voltage during electric driving of a rotating electric machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 2 ... Battery 3 ... Power part 4 ... Auxiliary equipment 5 ... Generator 6 ... FET 8 ... Controller

Claims (1)

[Claims] 1. A control device for a turbocharger with a rotary electric machine, wherein a rotary electric machine is mounted on a turbocharger for collecting exhaust energy to increase intake pressure of an engine, and the rotary electric machine is electrically driven by supplying power from a vehicle-mounted battery. Opening / closing means for opening / closing a circuit between a battery and a generator for charging the battery, a semiconductor switching element connected in parallel with the opening / closing means, and opening / closing means for electrically driving the rotating electric machine to control the auxiliary equipment. A control device for a turbocharger with a rotating electric machine, comprising: a control means for reducing a charging current by a semiconductor switching element for charging a battery, which is energized from the generator and whose electric charge is reduced by electric driving.