JPH0518257A - Method for returning from turbine rotation abnormality case of turbocharger with rotary electric machine - Google Patents

Abstract

PURPOSE:To provide a method for recovering the turbine of a turbocharger with a rotary electric machine from its rotational abnormality more simply in comparison with a conventional method to recover rotational abnormality of a turbine to its normal condition. CONSTITUTION:In a CPU to control the drive circuit of an inverter so that through selection of return from abnormality of the number of revolutions of the turbine of a turbocharger with a rotary electric machine according to the number of revolutions, abnormality due to disconnection of a turbine rotation sensor may be discriminated from abnormality due to level down during low number of revolutions a turbine rotation pulse is compared with a preceding rotation pulse to cover rotational abnormality of a turbine to its normal condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering a turbocharger with a rotating electric machine from abnormal turbine rotation, and more particularly to a method for detecting abnormal turbine rotation of a turbocharger and returning it to normal.

[0002]

2. Description of the Related Art In recent years, various proposals have been made to rotate a turbine with exhaust gas discharged from an engine and convert the rotational force of the turbine into electric energy to recover the exhaust energy, for example, as a turbocharger with a rotating electric machine. It is disclosed in Japanese Patent Laid-Open No. 63-302132.

The apparatus described in the above publication uses the energy of exhaust gas discharged from an engine to drive a turbine, and a compressor directly connected to the turbine compresses intake air to supply supercharged air to the engine. At the same time as pumping, the AC motor / generator directly connected to the rotating shaft of the turbine is operated as a generator to recover the DC power by using the exhaust energy obtained from the turbine as the generated power, and the engine speed is reduced to reduce the exhaust gas. When the gas pressure drops and the pressure of the supercharged air from the compressor also drops, the DC power that has been collected and stored is converted to AC power by an inverter and applied to the AC motor generator. It operates as an electric motor and assists the rotation of the compressor to obtain the required boost pressure.

The system controlling the output of the drive circuit of the inverter of the turbocharger driven by the drive device of the turbocharger with the rotating electric machine is the rotation input circuit of the turbine, the phase correction CPU and the drive circuit control CPU of the inverter. It is configured. In the drive circuit of this inverter, when the turbine rotation pulse of the turbocharger with rotating electric machine fluctuates more than a certain value compared to the previous rotation, the control circuit of the drive circuit of the inverter outputs the control output of the drive circuit of the inverter. To stop. Then, in order to return to the normal state from the time of abnormality, the power of the controller had to be turned off each time. Therefore, when the turbine rotation pulse fluctuates more than a certain value compared to the previous rotation, the control output of the drive circuit of the inverter stops and the program enters the closed loop to restore the power to the controller each time. There was a drawback that I could not.

[0005]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks, and its object is to be simpler than the conventional method of restoring abnormal turbine rotation to a normal state. It is an object of the present invention to provide a method of recovering from a turbine rotation abnormality of a turbocharger with a rotating electric machine that can be carried out.

[0006]

In order to achieve the above-mentioned object, in the method for restoring the abnormal rotation of the turbine of the present invention to normal, in the rotation pulse detected by the position sensor, the rotation speed of the previous rotation is detected. If the control output of the drive circuit of the inverter is stopped by changing more than a certain value compared to the pulse, a time lag is set until it returns to normal and it is returned by the program, and the rotation pulse detected by the position sensor is high-speed. When the control output of the drive circuit of the inverter is stopped by changing the value more than a certain value compared with the previous rotation speed pulse at the time of rotation, the output of the system is stopped until the power is turned off by putting it in a closed loop on the program. It was done like this.

[0007]

[Operation] When the turbine rotation pulse of the turbocharger with rotating electric machine rotates at a low speed, if the control output of the drive circuit of the inverter stops due to fluctuation over a certain value compared to the previous rotation, the rotation will be normal rotation. A time lag is provided before returning to normal operation by the program. Further, when the turbine rotation pulse of the turbocharger with rotating electric machine is rotating at a high speed, when the control output of the drive circuit of the inverter stops due to fluctuation above a certain value compared to the previous rotation,
The control output is stopped until the power is turned off by putting it in the closed loop on the program.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a sectional view showing a configuration of a turbocharger used in the present embodiment, and FIG. It is a flowchart up to.
In these drawings, reference numeral 1 denotes an engine, which drives a vehicle (not shown) by the combustion energy of the air sucked through the intake pipe 11 and the supplied fuel.
The exhaust gas after combustion is supplied to the turbocharger 2 via the exhaust pipe 12 and rotationally drives the turbine 21. Reference numeral 22 denotes a compressor, which is directly connected to a rotary shaft 23 of the turbine 21 and is rotationally driven by exhaust energy.
Is used to compress the air by means of the torque, and supercharges the air from the intake pipe 11 to the engine through the scroll 24. The operation of the compressor 22 increases the engine output. Reference numeral 13 is a boost pressure sensor for detecting supercharging air pressure, which is attached to the inner surface of the intake pipe 11, and 14 is an engine rotation sensor for detecting the engine speed.

Reference numeral 3 denotes a rotary electric machine composed of an AC motor generator, and a rotor 31 fixed to the rotary shaft 23 by screws 34.
And a stator 32 attached to the inner wall of the housing 25 of the turbocharger 2. The rotor 31 is, for example, a rotor having a field magnet of a permanent magnet. It constitutes a rotating electric machine. When the driving force of the turbine 21 due to the exhaust energy does not provide a sufficient supercharging operation of the compressor 22, the rotary electric machine 3 is supplied with electric power to perform powering to assist the supercharging operation of the compressor 22. It is a thing. 33
2 is a position sensor which, as is apparent from FIG. 2, includes a permanent magnet piece 35 and a detection coil 36, and detects the rotation speed of the blade of the compressor 22 to detect the rotation speed of the rotary electric machine 3 and the reference position. Then, the detected position signal PS is transmitted to the controller 6. It should be noted that FIG. 1 does not show the details of the position sensor 33, but merely schematically shows its approximate installation position. FIG. 3 is a flowchart for checking abnormal rotation of the turbine performed in the CPU that controls the drive circuit of the inverter and returning the rotation to normal.

A turbine rotation pulse of a turbocharger with a rotating electric machine enters a turbine rotation waveform shaping circuit, is pulsed, and then phase-corrected to control a drive circuit of an inverter.
Input to PU. The CPU controlling the drive circuit of the inverter compares the turbine rotation pulse with a value greater than a certain value as compared with the previous rotation, and if so, the control output of the drive circuit of the inverter. To stop. The method for recovering from the control output stop of the drive circuit of the inverter is selected according to the turbine speed at that time. That is, when the turbine rotation is high, the drive circuit of the inverter does not output unless the power is turned off and the turbine is reset. When the turbine rotation is low, a time lag is provided to restore normal operation.

Therefore, it is possible to avoid the uncontrollability due to the phase abnormality due to the level reduction of the turbine rotation pulse.

[0012]

EFFECTS OF THE INVENTION By selecting the recovery from the abnormal turbine rotation of the turbocharger with rotating electric machine according to the turbine speed, it is possible to distinguish the abnormality due to the disconnection of the turbine rotation sensor from the abnormality due to the level reduction at low speed. Therefore, it is possible to avoid uncontrollability due to voltage level down (level instability) of the turbine rotation pulse when the turbine rotation is low.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing the configuration of a turbocharger used in this embodiment.

FIG. 3 is a flowchart of a main program of the present invention.

[Explanation of symbols]

 1 ... Engine 2 ... Turbocharger 3 ... Rotating electric machine 4 ... Exhaust pipe, 5 ... Power converter 6 ... Controller 7 ... Battery 8 ... Accelerator pedal 21 ... Turbine 22 ... Compressor 23 ... Rotating shaft 33 ... Position sensor 35 ... Permanent magnet piece 36 ... Coil for detection

Claims (1)

Claim: What is claimed is: 1. A rotary electric machine having a turbine rotated by exhaust gas of an engine, a compressor rotated by the turbine, and an AC motor / generator provided on a rotary shaft connecting the turbine and the compressor. In the method of recovering from the turbocharger turbine abnormality of the turbocharger, the rotation pulse detected by the position sensor that detects the mechanical rotation speed of the rotating shaft is equal to or more than a certain value compared to the previous rotation speed pulse at low speed rotation. If the control output of the drive circuit of the inverter fluctuates and is stopped, there is a time lag until it returns to the normal state and it is returned by the program.When the rotation pulse detected by the position sensor rotates at high speed, If the control output of the inverter drive circuit is stopped due to fluctuations above a certain value, the program A method for recovering from a turbine rotation abnormality of a turbocharger with a rotating electric machine, characterized in that the output of the system is stopped until the power is turned off by putting it in a closed loop on the system.