JPS63272907A - Control device for turbocharger provided with rotary electrical machine - Google Patents

Abstract

PURPOSE:To make it possible to produce supercharged pressure in accordance with the degree of depression of an accelerator by mounting a rotary electrical machine serving as a motor-generator to a turbocharger, and by controlling the rotary electrical machine with the use of a control means in accordance with the operating condition of the internal combustion engine. CONSTITUTION:A turbocharger 2 is composed of turbine blades 2b driven by exhaust gas, and compressor blades 2b coupled to the turbine blades 26 through the intermediary of a rotary shaft 2c. In an internal combustion engine provided with the above-mentioned turbocharger, a rotary electrical machine 3 serving as a motor or a generator is mounted to the above-mentioned rotary shaft 2c, and the operating mode of the rotary electrical machine 3 is switchingly controlled by means of a controller 6 which receives output signals from sensors 1c through 1e for detecting the degree of depression of an accelerator, the load and rotational speed of the internal combustion engine. That is, if a boost pressure corresponding to the degree of depression of the accelerator cannot be obtained during high load operation, the rotary machine is operated in the motor mode so as to increase the supercharge air pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a turbocharger with a rotating electric machine, in which an electric generator is attached to the rotating shaft of the turbocharger.

(Prior Art) Since the exhaust gas emitted by an internal combustion engine is high temperature and high pressure, various methods and devices have been proposed to recover this energy as drive or electric power.

As this type of exhaust energy recovery device, the rotating shaft of the alternator is directly connected to the exhaust turbine of the engine, and
A DC motor is attached to the engine.

JP-A-58-214615 discloses a proposal for an engine exhaust energy recovery device that supplies electric power generated from an AC generator to a DC motor and recovers the exhaust energy as driving force for the engine. .

(Problems to be Solved by the Invention) The proposal disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 58-214615 is to generate rotational force of the engine by driving an electric motor connected to the engine using electric energy recovered from exhaust energy. However, there is a problem in that it lacks measures to use exhaust energy to increase supercharging air and control engine output according to the amount of accelerator pedal depression and load condition of the engine.

The present invention was made in view of such problems,
The purpose of this is to use exhaust energy to control the rotating electric machine installed in the turbocharger according to the operation of the internal combustion engine, increasing its efficiency, and supplying boost pressure according to the amount of accelerator pedal depression and load condition. is to provide turbocharger control equipment.

(Means for Solving the Problems) According to the present invention, a rotating electrical machine serving as a motor-generator provided in a turbocharger, an operation control means for controlling the operation of the rotating electrical machine, and an operating state of an internal combustion engine are provided. A control device for a turbocharger with a rotating electric machine is provided, which has an operation detection means for detecting the operation, and a control means for controlling the supercharging operation of the rotating electric machine by operating the operation control means based on a signal from the operation detection means. .

(Function) In the present invention, the engine speed, load condition, and accelerator pedal depression amount are detected to determine the load condition of the internal combustion engine, and boost pressure corresponding to the accelerator pedal depression amount can be obtained under heavy load. When it is not available, the rotating electric machine is operated to increase the supercharging pressure and the boost pressure corresponding to the amount of accelerator pedal depression is obtained.

The present invention also has the effect of controlling the rotational operation of a rotating electric machine driven by an electric motor by detecting its back electromotive force and phase angle.

(Example) Next, an example of the present invention will be described in detail using the drawings.

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

In FIG. 1, 1 is an internal combustion engine that drives a vehicle (not shown) by the combustion energy of air taken in through an intake pipe 1a and fuel supplied from a fuel tank 1g through an injection pump 1f. The exhaust gas after combustion is discharged through the exhaust pipe 1b. 1c is an accelerator sensor that is a means for detecting the amount of accelerator pedal depression; 1d is a load sensor that detects the rack position of the injection pump 1f and is a means for detecting the load on the internal combustion engine; and 1e is a rotation sensor that detects the number of revolutions of the internal combustion engine. The detected signals are sent to a controller 6, which will be described later.

A turbocharger 2 is connected to the exhaust pipe 1b and the intake pipe 1a, and has a turbine blade 2b driven by exhaust gas and a compressor blade 2a that supplies intake air to the intake pipe 1a. A rotating electrical machine 3 that operates as an electric motor or a generator is attached to the connected rotating shaft 2C.

The rotating electrical machine 3 has a rotor 3 a and a stator 3 b. When the rotor 3 a is rotationally driven by exhaust energy, alternating current power is generated in the stator 3 b and transmitted to the battery 5 via the power converter 4 .

Furthermore, when the rotor 3a is driven by the power from the battery 5 via the power converter 4, the compressor blades 2
The intake air is compressed by the operation of step a, and is supercharged to the internal combustion engine 1 via the intake pipe 1a. In addition, 1 hour
A boost sensor detects the supercharging pressure caused by the operation of the compressor blade 2a and transmits it to the controller 6.

The power converter 4 converts AC power from the stator 3b when the generator is operated into, for example, charging power for the battery 5, or converts DC power from the battery 5 into a predetermined AC power to drive the rotary m3 as an electric motor. It converts it into electricity. Therefore, in addition to a rectifier circuit and a smoothing circuit that convert AC to DC, it is equipped with an inverter, a booster circuit, etc. that convert DC to AC, and the AC frequency to be converted, its voltage, and power are controlled by commands from the controller 6. It is. Note that 3c is an AC measuring meter that measures the voltage value, current value, mutual phase, etc. of the AC power converted by the power converter 4 and supplied to the stator 3b, and 4a is an AC measuring meter that measures the DC voltage converted by the power converter 4. These are DC voltmeters that measure, and each transmits a measured value to the controller 6.

The controller 6 is composed of a microcomputer, and includes a central processing unit that calculates the supplied fuel, required power, boost pressure, etc. based on the operating state of the internal combustion engine 1 and signals from various sensors, a memory for the results of these calculations, and the internal combustion engine. , various memory devices that store control programs for the rotating electric machine, and input/output devices that receive various inputs and issue control instructions to related parts. Note that the voltage value of the back electromotive force induced in the stator 3b when the rotating electric machine 3 is in rotation operation,
The power value, its frequency value, and its correlation with the terminal voltage of the stator 3b are configured to be input to the controller 6.

FIG. 2 is a processing flow diagram showing an example of the operation in this embodiment, and the operation will be explained with reference to the same figure.

First, in step 1, when the load on the internal combustion engine 1 is determined to be light based on the signals from the accelerator sensor lc, load sensor ld, and rotation sensor 1e of the internal combustion engine 1, the rotating electric machine 3 is activated as a generator. If supercharging operation is desired due to heavy load based on signals from various sensors, the process goes to step 2 in 8 lines. Then, the accelerator signal is output from the accelerator sensor IC.
In steps 2 to 4, a rotational speed signal of the internal combustion engine 1 is read from the rotation sensor 1e, and a load signal based on the rack position of the injection pump 1f is read from the load sensor 1d. In step 5, the difference between the boost pressure corresponding to the accelerator signal and the boost pressure corresponding to the load signal is determined, and the motor torque that provides the boost pressure corresponding to the difference is calculated. Then, in step 6, the rotation speed N1 of the turbocharger 2 is set.

On the other hand, in steps 7 to 10, the peak position of the output voltage of the back electromotive force due to the rotation of the rotor 3a during operation of the rotating electric machine 3 is determined, and the power factor is calculated based on the terminal voltage of the stator 3b and the phase of the current, and the amount of electric power is is calculated and the process proceeds to step 11.

In step 11, a command is given to the power converter 4 to set the AC power for driving the rotating electric machine 3, and in step 12, a load position when the boost pressure increases is set.

Then, in step 13, the inverter of the power converter 4 is operated to convert the electric power from the battery 5 into AC power of a predetermined voltage and a predetermined frequency for operating the rotating electric machine 3.

In step 14, the rotation speed of the turbocharger driven by the above-mentioned AC power is set as N2, and when N2 is larger than the rotation speed Nl in step 6, the rotation speed of the turbocharger is detected, and in step 16, the supplied power is Set the phase and maximum torque. In step 1, the accelerator signal from the accelerator sensor IC and the load signal from the load sensor 1d are compared, and if the accelerator signal is large, the process proceeds to step 18, where it is again determined whether the motor is driven by the electric motor or the generator. In the case of driving, proceed to step 19. Then, in step 20, the boost pressure P1 at each rotation speed and accelerator position is called and compared with the current boost pressure P2.
It will be held at If P2<PI, control is performed in step 21 so that the motor torque corresponds to the accelerator position. Incidentally, in step 20, when the current boost pressure P2 is greater than P, the AC power from the power converter 4 is controlled to be reduced, and the process returns to the initial flow to repeat each step.

Also, in stationary 14, the rotation speed of the turbocharger N2
When does not reach the rotational speed Nl in step 6, the flow of steps 1 to 14 is repeated, and if the rotational speed N1 is not reached even after repeating the predetermined number of times n, an abnormality signal is issued to issue a warning. (Steps 23-25).

Although one embodiment of the present invention has been described above, various modifications can be made within the scope of the gist of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) In the present invention, the rotating electric machine attached to the turbocharger is controlled based on the rotation speed, load condition, and amount of accelerator pedal depression of the internal combustion engine, and when the internal combustion engine is under heavy load, the rotating electric machine is controlled based on the amount of depression of the accelerator pedal. When boost pressure cannot be obtained, the rotating electric machine is operated to increase supercharging pressure, which has the effect of obtaining boost pressure according to the amount of accelerator pedal depression.

Further, in the present invention, since the rotational operation of the rotating electrical machine is controlled based on the back electromotive force generated in the stator, the rotating electrical machine can be operated efficiently.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
The figure is a processing flow diagram showing an example of the operation of this embodiment. 1... Internal combustion engine, 1c... Accelerator sensor, 1d.
... Load sensor, 1f... Injection pump, 2... Turbocharger, 3... Rotating electric machine, 4... Power converter, 6... Controller. Patent applicant: Isuy Automobile Co., Ltd. Attorney: Minoru Tsuji No. 1
figure

Claims (3)

[Claims] (1) A rotating electrical machine that serves as an electric generator provided in a turbocharger, an operation control means for controlling the operation of the rotating electrical machine, an operation detecting means for detecting the operating state of the internal combustion engine, and a 1. A control device for a turbocharger with a rotating electric machine, comprising a control means for controlling supercharging operation of the rotating electric machine by operating the operation control means based on a signal. (2) The operation detection means for the internal combustion engine is comprised of an internal combustion engine rotation speed detection means, an accelerator pedal depression amount detection means, and an internal combustion engine load detection means. A control device for a turbocharger with a rotating electric machine. (3) The operation control means for the rotating electric machine is a control means for controlling the rotational operation by detecting the positions and electrical angles between the rotor and the stator when the rotating electric machine is rotating. 1) A control device for a turbocharger with a rotating electric machine as described in item 1).