JP3092260B2 - Control device for turbocharger with rotating electric machine - Google Patents

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 rotary electric machine, which has a rotary electric machine mounted on a turbine shaft of a turbocharger and controls the operation of the rotary electric machine in accordance with the operation state of an engine.

[0002]

2. Description of the Related Art In recent years, a turbocharger has been widely used in which a compressor is mounted on a rotating shaft of a turbine driven by exhaust energy, and a supercharged air is supplied to an engine by a pneumatic operation of the compressor.

[0003] Various attempts have been made to attach a rotating electric machine to the turbine shaft of this kind of turbocharger, and to operate the motor electrically or generate electricity in accordance with the operating state of the engine.

When the engine is operated, an AC generator (AC) for charging a battery connected to a crankshaft is used.
G) or a fan for cooling the engine is operated by the engine torque.

[0005]

During high-speed operation of such an engine, there is a problem that torque is lost by driving auxiliary equipment as a factor for suppressing an increase in output of the engine. The power generation causes a decrease in output of about 2%.
% Output is said to be reduced in a 2800 cc diesel engine.

[0006] Regarding the control of a generator for a vehicle, Japanese Utility Model Laid-Open Publication No. 63-17535 discloses a vehicle for controlling a power generation amount of a generator by detecting a charge amount of a battery and controlling based on the detected charge amount. A generator control device is shown.
Japanese Patent Application Laid-Open No. 7-157011 discloses a cooling fan control device for an engine, but none of them has taken measures to reduce the drive loss of the AC generator and the cooling fan when the engine is fully loaded. There is.

The present invention has been made in view of such a problem, and an object of the present invention is to reduce an output loss due to driving of accessories and the like at the time of high-speed output of an engine having a turbocharger with a rotating electric machine. An object of the present invention is to provide a control device for a turbocharger with a rotating electric machine.

[0008]

According to the present invention, there is provided a turbocharger with a rotating electric machine for increasing the output at high speed of an engine equipped with a turbocharger having a rotating electric machine on a turbine shaft. In the control device, charge detection means for detecting the state of charge of a vehicle-mounted battery, operation control means for a battery charging generator, and control of the operation control means and the power generation operation of the rotating electric machine by a signal from the charge detection means A control device for a turbocharger with a rotating electric machine, comprising:

[0009]

According to the present invention, the charging rate of the battery is checked at the time of full load of the engine, and if the charging is sufficient, the operation of the AC generator for charging is stopped, and the torque required for driving the accessories is reduced. Also, even if the charging rate of the battery is slightly reduced, the operation of the AC generator is stopped by the power generation operation of the rotating electric machine of the turbocharger, thereby preventing the output from being reduced by the driving torque of the auxiliary devices.

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

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

In FIG. 1, reference numeral 1 denotes an engine, an intake pipe 1a.
The vehicle is driven by the combustion energy of the air supplied through the air and the supplied fuel, and the exhaust gas after combustion is exhausted through the exhaust pipe 1b.

Reference numeral 2 denotes a turbocharger, which is connected to the engine 1 by an exhaust pipe 1b and an intake pipe 1a and includes a turbine 2b driven by exhaust energy, and a compressor 2a rotated by the torque of the turbine. Fresh air is taken in from the cleaner 2c and compressed, and the supercharged air is sent to the engine 1 through the intake pipe 1a to increase the engine torque. Reference numeral 2d denotes a silencer provided at the outlet of the exhaust gas after driving the turbine 2b.

Reference numeral 3 denotes a rotating electric machine serving as a motor-generator, which is mounted on a turbine shaft and includes a rotor 3a and a stator 3b. When the exhaust energy is large, the rotating electric machine operates as a generator. It does not have a power source for auxiliary equipment and the like described later, and is configured to be electrically driven by the electric power from the battery 4 when the supercharging pressure due to the exhaust energy cannot be sufficiently obtained, thereby energizing the pneumatic operation of the compressor 2a. ing. The battery 4 is provided with a battery sensor 4a capable of detecting a terminal voltage and an input / output current of the battery, and a liquid temperature sensor 4b capable of detecting a liquid temperature.

Reference numeral 40 denotes a power converter, which receives AC power from the rotating electric machine 3 at the time of a power generation operation, converts the AC power into DC power for charging the battery 4, and outputs power from the battery 4 to electrically drive the rotating electric machine 3. It converts DC into predetermined AC power, and has built-in high-power devices such as rectifiers, inverters, and transformers.

Reference numeral 5 denotes an alternating current generator (ACG) driven by engine torque, which serves as a power source for the electric fan 6 and other accessories 60 for charging the battery 4 and for cooling the engine. The shaft is connected to the shaft by a belt.

A semiconductor switching element FETb is inserted into a circuit between the AC generator 5 and the battery 4, and when a control signal is inputted to the FETb from a controller described later, the power of the AC generator 5 is reduced. Off / on control is performed, and FE between the battery 4 and the electric fan 6 is controlled.
When the control signal is input to Ta, the operation of the electric fan 6 is controlled. Reference numeral 6a is a cooling water temperature sensor that detects the temperature of the cooling water of the engine 1.

The controller 7 comprises a microcomputer and includes a central processing unit, various memories and input / output circuits, and the like. The rotation sensor 1c of the engine 1, the cooling water temperature sensor 6a, the battery sensor 4a, the liquid temperature sensor 4b, and the like. When various signals are input from the CPU, predetermined arithmetic processing, control map search, and the like are performed, and based on these, predetermined commands are issued to the power converter 40, FETa, FETb, and the like that control the rotating electric machine 3. Is configured.

FIG. 2 is a processing flowchart showing an example of the operation of the present embodiment. Next, the operation of the present embodiment will be described with reference to FIG.

In step 1, the key switch of the engine is turned on. In step 2, the voltages VB and TB of the battery 4 are detected by the battery sensor 4a and the liquid temperature sensor 4b.
, And in step 3, the charging rate Cc is read from the stored map based on these values, and the engine is started.

Next, at step 5, the battery sensor 4a
, The current IB of the battery is measured, and the charging rate Cc is constantly monitored by the formula of Cc = Cc + KIBΔt shown in step 6.

In step 7, it is checked whether or not the engine is generating the maximum output. When the maximum output is generated and the charging rate Cc is 100% or more, the process proceeds from step 9 to step 10, and the rotation is started. Without causing the electric machine 3 to generate electric power, the FETb is turned off in Step 11 to cut off the current from the AC generator 5, and in the next Step 13, the cooling water temperature is measured by the water temperature sensor 6a. If necessary, drive by turning on FETa,
Increase the torque at the maximum output. If the electric fan 6 is not required in step 13, the process goes to step 15 to turn off the FETa and continue the high output of the engine.
The routine shifts to the normal control in step 8.

On the other hand, even if the charging rate is less than 100% in step 9, if the charging rate is more than 80%, for example, step 16
The process proceeds from step 17 to step 17 after securing the power generation of the rotating electric machine 3 and proceeds to step 11, where the stop of the operation of the AC generator 5 and the control of the electric fan 6 become possible. If the charging rate has not reached, for example, 80% in step 16, the power generation by the AC generator 5 and the power generation by the rotary electric machine 3 are performed in steps 18 and 19, and in step 13, the electric fan is controlled by the state of the engine water temperature and the like. 6 will be performed.

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

[0025]

According to the present invention as in the above embodiment,
Check the charging rate of the battery, if the charging rate is sufficient at full load of the engine, stop the operation of the charging alternator, reduce the engine output loss due to the driving force of the auxiliary equipment,
In addition, even if the battery charge rate is slightly reduced, the rotating electric machine provided in the turbocharger is operated to generate power, the operation of the AC generator is stopped, and the auxiliary power is driven to prevent a decrease in engine output. Can be

It should be noted that when the engine is at full load, the exhaust gas is normally exhausted by the wastegate of the turbocharger. Therefore, even if the rotating electric machine operates to generate power, the output does not decrease.

[Brief description of the 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 processing flowchart illustrating an example of the operation of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Turbocharger 3 ... Rotating electric machine 4 ... Battery 4a ... Battery sensor 4b ... Liquid temperature sensor 5 ... AC generator 6 ... Electric fan 7 ... Controller 40 ... Power converter

Claims (2)

(57) [Claims] 1. A control device for a turbocharger with a rotating electric machine for increasing the output at high speed of an engine equipped with a turbocharger having a rotating electric machine on a turbine shaft, a charging detecting means for detecting a charging state of a vehicle-mounted battery; A turbocharger with a rotating electric machine, comprising: an operation control means for a battery charging generator; and a high-speed control means for controlling the operation control means and a power generation operation of the rotating electric machine by a signal from the charge detecting means. Charger control device. 2. The high-speed control means stops the operation of the charging generator when the charging rate of the battery is high, and activates the rotating electric machine to generate power when the charging rate of the battery is low, thereby causing the charging generator to operate. The control device for a turbocharger with a rotating electric machine according to claim 1, wherein the operation is stopped.