JPH0598987A - Controller for turbocharger with dynamo-electric machine - Google Patents

Abstract

PURPOSE:To controllably prevent auxiliaries mounted on a vehicle from an evil influence of a battery having a voltage drop due to the consumption of large electric power when a dynamo-electric machine mounted on a turbine shaft of a turbocharger is motor driven to increase supercharging pressure. CONSTITUTION:A relay 1 for opening and closing a circuit between a battery 2 and generator 3, a charging current limiting resistor R and a relay 2 connected in parallel to the resistor R are connected as shown in the drawing. The relay 1 is turned off when a dynamo-electric machine 1 is motor driven, and current is supplied from the generator 3 to auxiliaries 4 to prevent the battery 2 from the reduction of terminal voltage. In charging the battery 2 having a charge amount reduced due to the motor drive, charging current from the generator 3 is limited through the resistor R to lessen a drop in generating voltage. When the battery is recovered to a predetermined voltage value, the relay 2 is closed to short the resistor R.

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 equipped with a rotary electric machine, which is intended to prevent adverse effects of a battery terminal voltage drop caused by driving a rotary electric machine mounted on the turbocharger on auxiliary machinery.

[0002]

2. Description of the Related Art In recent years, a turbocharger for recovering exhaust energy to increase supercharging air pressure to an engine has been widely used, and an electric motor is used for a rotary shaft of this type of turbocharger.
Various attempts have been made to attach a rotating electric machine that serves as a generator and electrically drive the rotating electric machine or generate power according to the operating state of the engine.

During the electric drive of the rotary electric machine, a large current is supplied from the battery at the initial stage of the electric drive.
The voltage compensator proposed by the applicant of the present invention is disclosed in Japanese Unexamined Patent Application Publication No. Hei 1 (1999) -54, in order to prevent the terminal voltage from dropping and the functions of the auxiliary devices from decreasing.
No. 2,576,641.

[0004]

According to the proposal disclosed in the above-mentioned publication, the control means for suppressing the passage of electric power is used as a control means.
Although an iron core type reactor having a secondary winding and having a free reactance value due to saturation of the iron core is used, there is a disadvantage that such a special component is required. The present invention does not use a special component of this kind, but normally uses a vehicle-mounted alternator for battery charging to prevent a deterioration in the functions of auxiliary machinery due to a voltage drop, and a control device for a turbocharger with a rotating electric machine. To provide.

[0005]

To achieve the above object, according to the present invention, a rotary electric machine is attached to a turbine shaft of a turbocharger which is driven by exhaust energy and pressure-feeds supercharged air to an engine. In a control device for a turbocharger with a rotating electric machine that electrically drives an electric machine by supplying electric power from a vehicle-mounted battery when the engine torque is insufficient,
An opening / closing means for opening / closing a circuit between the battery and a generator for charging the battery, a current limiting means for limiting a charging current from the generator when the battery is charged, and an opening / closing means for electrically driving the battery are provided. A turbocharger with a rotating electric machine having a control means for controlling the opening and energizing auxiliary equipments mounted on the vehicle from a generator and activating and controlling the current limiting means at the time of charging the battery whose electric charge is reduced by the electric drive. Is provided.

[0006]

In the present invention, when the rotating electric machine is electrically driven, the circuit between the battery and the generator is cut off to energize the auxiliary machinery from the generator to prevent the battery voltage from decreasing, and the electrically driven unit reduces the amount of electricity stored. When charging the battery, the charging current is limited by connecting it to the generator through a resistor to reduce the decrease in the generated voltage, thereby reducing the adverse effects due to the voltage decrease of the auxiliary equipment.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

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

In FIG. 1, reference numeral 1 denotes a rotating electric machine (TC) which is an electric motor-generator attached to a rotary shaft of a turbocharger.
G), 2 is a vehicle-mounted battery, 3 is a generator (ACG) that generates electric power by the torque of the engine, and 4 is an auxiliary machine such as a headlight or a vehicle-mounted electric device.

The rotary electric machine 1 operates as an electric motor when power is supplied from the battery 2 through the switch B when the engine is running at low speed and high load, and assists the pneumatic operation of the turbocharger to raise the supercharging air pressure to the engine. When the engine speed is high and the exhaust energy has a margin, the rotary electric machine 1 is caused to generate electric power to recover the exhaust energy as electric power and use it for charging the battery 2. Has been done.

The generator 3 is a well-known alternator, which charges the battery 2 and serves as a power source for the auxiliary machines 4. In this embodiment, while the battery 2 is electrically driving the rotating electric machine 1, a large electric power is supplied. Is consumed and the terminal voltage drops, and sufficient performance cannot be expected due to a drop in the supply voltage to the auxiliary machinery 4. Therefore, the connection between the generator 3 and the battery 2 is disconnected by the relay 1, and the auxiliary machinery is disconnected. Power is supplied from the generator 3 to the class 4. Also,
After the battery 2 is driven by the rotating electric machine 1, the amount of stored electricity decreases and the terminal voltage is low. Therefore, when the generator 3 is directly connected to the battery 2, the generated power is mainly supplied to the battery 2 and the generated voltage decreases. Since the auxiliary equipment 4 is also adversely affected, the battery 2 is charged through the resistor R shown in the figure, and after the voltage of the battery 2 is restored to a predetermined level, the relay 2 is closed to short-circuit the resistor R and the generated power is applied. Is configured to.

FIGS. 2 and 3 are curve diagrams for explaining the relationship between the electric drive of the rotating electric machine, the connection / disconnection between the battery and the generator, and the voltages of the battery and the auxiliary machines in such a case. 2 shows the case where the resistor R is not used, and FIG. 3 shows the case where the resistor R is used. As is apparent from these figures, when the generator and the battery are directly connected after driving the rotary electric machine, Although the voltage of the auxiliary machinery is greatly reduced like the portion a in FIG. 2, the voltage drop is small like the portion b in FIG. 3 when the resistor R is interposed, and even if it is directly connected after a predetermined recovery. A small voltage drop like the part c is enough.

Reference numeral 5 in FIG. 1 is a controller for controlling the electric drive of the rotating electric machine, the relay, and the like. Next, the control of the present embodiment will be described using the control flow chart shown in FIG.

In step 1, it is determined whether or not the electric rotating machine (TCG) is electrically driven. If it is driven, the process proceeds to step 2,
The relays 1 and 2 are opened, the TCG uses the battery 2 as a power source, and the auxiliary machines 4 are energized from the generator 3.
In step 3, the switches B and A are closed and power is separately supplied to electrically drive the TCG. Then, in this driving state, when it is determined in step 4 that the driving of the TCG is stopped, the switch B is opened to stop the operation of the TCG in step 5, and then the relay 1 is operated to be closed in step 6.
The battery 2 is charged with the current supplied from the generator 3 via the resistor R. In this case, since the resistance R intervenes in the circuit to the battery 2, the current from the generator 3 is limited and the decrease in the generated voltage is suppressed, so that the auxiliary equipment 4 using the generator 3 as a power source is prevented. The influence is small, and the battery voltage can be recovered.

Next, because of the resistance R, the charging of the battery 2 is delayed and it is difficult to reach the original voltage. However, when the battery voltage rises slowly in step 7 and recovers to a predetermined voltage, the process proceeds to step 9 and the relay 2 Will be closed and the resistor R will be short-circuited to perform charging, and the process will return to the first step 1.

If the battery voltage continues to rise in step 7, the battery voltage recovery is awaited while monitoring the determination of electric drive of the TCG in step 8, and the determination in step 8 is made before the recovery determination. If it is determined that the electric drive is started, the process returns to step 2 to control the relays 1 and 2 to open, and the flow is repeated.

Although the present invention has been described with reference to the above-described embodiments, various modifications can be made within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0018]

According to the present invention as in the above embodiments,
When a rotary electric machine mounted on a turbocharger is driven electrically according to the operating condition of the engine, if a large amount of electric power is required and the terminal voltage of the battery drops and adversely affects auxiliary equipment, Without using special parts, disconnect the circuit between the generator for normal charging and the battery, supply power to the auxiliary machinery from the generator to operate it, and charge the battery with reduced charge At times, the resistor R is first inserted to charge the battery without directly connecting the battery to the generator, and then the resistor R is short-circuited and charged after the battery voltage has recovered to a predetermined value. It is possible to obtain the effect that the adverse effect on the auxiliary machinery due to can be prevented to a minimum.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a connection of 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 illustrating the relationship between the driving state of the rotating electric machine, the coupling between the battery and the generator, and the voltage of the battery or the like.

FIG. 3 is a curve diagram illustrating the relationship between the driving state of the rotating electric machine, the coupling between the battery and the generator, and the voltage of the battery or the like in the present embodiment.

FIG. 4 is a control flow chart showing an example of control of the present embodiment.

[Explanation of symbols]

 1 ... Rotary electric machine (TCG) 2 ... Battery 3 ... Generator (ACG) 4 ... Auxiliary equipment 5 ... Controller

Claims (2)

[Claims] 1. A rotary electric machine is mounted on a turbine shaft of a turbocharger that is driven by exhaust energy to pump supercharged air to an engine, and the rotary electric machine is electrically driven by supplying electric power from a vehicle battery when the torque of the engine is insufficient. In a control device for a turbocharger with rotating electric machine, an opening / closing means for opening / closing a circuit between the battery and a generator for charging the battery, and a current limiting means for limiting a charging current from the generator when the battery is charged When the electric drive is performed, the opening / closing means is controlled to open to energize auxiliary equipments mounted on the vehicle from the generator, and the electric current drive is used to control the current limiting means at the time of charging of the battery whose electric storage amount is reduced. A control device for a turbocharger with a rotating electric machine, comprising: 2. The current limiting means is operated so that the current limiting means is short-circuited and directly connected while the battery is being charged while the battery is being charged. 1. A control device for a turbocharger with a rotating electric machine according to 1.