JPH0598985A - Controller for rotation of turbocharger - Google Patents

Abstract

PURPOSE:To control the rotational frequency of a turbocharger so that an evil influence due to the increase of amplitude in the rotational frequency of resonance is prevented. CONSTITUTION:A dynamo-electric machine 3 is mounted on a rotary shaft 12 of a turbocharger 1. When the rotational frequency of the turbocharger 1 reaches the vicinity of a resonance point during acceleration, the dynamo-electric machine 3 is motor driven by a battery 5 as a power source to be accelerated and pass fast through the resonance point. The dynamo-electric machine 3 is operated to generate power in deceleration, reduce the turning force, and pass fast through the resonance point for reducing amplitude in the resonance point.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation control device for a turbocharger, which reduces vibration at a resonance point when the turbocharger is driven by exhaust energy and pressure-feeds supercharged air to an engine.

[0002]

2. Description of the Related Art In recent years, a compressor has been attached to a rotary shaft of a turbine driven by exhaust energy of an engine,
A turbocharger is widely used in which supercharged air is pressure-fed to an engine by pressure operation of the compressor to increase engine torque.

In this type of turbocharger, normally, within its operating speed range, there are about 1 to 3 modes such as turbine side vibration, compressor side vibration or lateral bending primary vibration as shown in FIG. There is vibration due to resonance, and as a countermeasure against that vibration, a float bearing is used on the rotating shaft to suppress the vibration due to resonance due to the damping effect of the oil film.

On the other hand, in turbine control, a turbine acceleration monitoring device for protecting the turbine from resonance speed operation is disclosed in Japanese Patent Publication No. 58-1251.

[0005]

The damping effect of the oil film in the former case is influenced by the oil temperature, the oil clearance, and the unbalance amount, and sufficient quality control is required to have a stable damping effect. There is a problem that the cost increases. Also, if rigidity is improved to prevent resonance, friction increases due to an increase in the diameter of the rotating shaft,
Problems such as deterioration of acceleration response due to increase in mass will occur.

Further, in the latter turbine acceleration monitoring device,
An alarm is issued below the normal turbine speed, and the turbine is tripped at lower speeds, making continuous operation impossible, and it is possible to continuously monitor the starting acceleration of the turbine but not to monitor it during deceleration. There's a problem.

The present invention has been made in view of the above problems, and an object thereof is to mount a rotary electric machine on the rotating shaft of a turbocharger and to control the operation of the rotary electric machine near the resonance point to accelerate the passing acceleration. An object of the present invention is to provide a turbocharger rotation control device that suppresses an increase in amplitude.

[0008]

In order to achieve the above-mentioned object, according to the present invention, there is provided a rotation control device for a turbocharger, which suppresses an increase in vibration at a resonance rotational speed caused by the operation of the turbocharger. A rotary electric machine that is a motor-generator attached to the rotary shaft of the charger, and when the rotational speed of the turbocharger reaches the vicinity of the resonance rotational speed, the rotary shaft is energized / de-energized by the operation control of the rotary electric machine to pass the resonance point. There is provided a rotation control device for a turbocharger, the rotation control device having a control mechanism for speeding up.

[0009]

According to the present invention, the rotating electric machine is attached to the rotary shaft of the turbocharger, and when the rotational speed of the turbocharger reaches the vicinity of the resonance point, it is accelerated by electric drive of the rotating electric machine, or is decelerated by operating the generator to generate the resonance point. To prevent the amplitude from increasing due to resonance.

[0010]

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

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

In the figure, 1 is a turbocharger,
The turbine 2 is connected to the engine 2 by an exhaust pipe 21 and an intake pipe 22, and is driven by the energy of exhaust gas passing through the exhaust pipe 21, and a rotating shaft 12 of the turbine 11.
And a compressor 13 attached to the engine 13. Compressed air of the compressor 13 is sent as supercharged air to the engine 2 through the intake pipe 22 to increase engine torque.

Reference numeral 3 denotes a rotating electric machine that serves as an electric-generator. A rotor 31 is directly connected to the rotary shaft 12, and a stator 32 corresponding to the rotor 31 is a housing 1 of the turbocharger 1.
It is attached to the inner wall of No. 4. Further, 15 is a bearing, for example, a ball bearing is used, and the turbine 1
1. Rotating shaft 12 including rotor 31 and compressor 13
The shaft is supported to reduce the friction.

Reference numeral 4 denotes a power converter, which is an input battery 5
To convert the DC power from the AC power into AC power of a predetermined frequency to drive the rotating electric machine 3, or to rectify the electric power from the rotating electric machine 3 during the power generation operation to convert it into charging power for the battery 5. Such a power conversion command is issued from the controller 6.

The controller 6 is composed of an electronic control unit, and inputs a rotation speed of the turbocharger 1 and a signal from a vibration sensor arranged at a predetermined portion of the turbocharger, so that the rotation of the turbocharger 1 is a resonance rotation speed. When passing through the vicinity, the electric power converter 4 is instructed to increase the acceleration by the electric / power generation control of the rotary electric machine 3 to pass the electric power.

FIG. 2 is a process flow chart showing an example of the operation of this embodiment, and the operation of this embodiment will be described with reference to this figure.

First, in step 1, the rotational speed of the turbocharger is detected, and in step 2, it is checked whether or not it is near the resonance rotational speed. If NO here, the flow ends, but in the vicinity of the resonance rotational speed, the process proceeds to step 3, and if the rotational speed increases, the process proceeds to step 5, and the electric power from the battery 5 is transmitted via the power converter 4 to the rotary electric machine. 3, the motor is electrically driven and acceleration is applied to the rotation of the turbocharger to pass the resonance rotation speed. Therefore, as shown in FIG. 3, when passing near the resonance rotational speed, when the acceleration is 0, the resonance may increase the amplitude, which may have a bad effect. As shown by the broken line, the increase in amplitude is suppressed.

In the case of deceleration in step 3 described above, the process proceeds to step 4 to cause the rotating electric machine 3 to generate electric power, convert the rotating torque into electric energy to rapidly reduce the rotational speed, and reduce the rotational speed near the resonance rotational speed. The passage is accelerated to control the increase in amplitude due to resonance.

FIG. 4 is a curve diagram showing the relationship between the high and low rotational speed and the acceleration. The higher the rotational speed of the turbocharger, the larger the exciting force at the resonance rotational speed and the larger the amplitude. In order to increase the passing acceleration, it is necessary to strongly control the electric or power generation operation of the rotary electric machine 3.

[0020]

According to the present invention as in the above embodiments,
If the rotating electric machine is attached to the rotary shaft of the turbocharger, and the turbocharger reaches the vicinity of the resonance speed during acceleration, the electric power is applied to the rotating electric machine to add acceleration to pass the resonance point earlier, and When the speed approaches the resonance speed during deceleration, the rotating electric machine generates electric power to apply a load to the rotation and quickly pass through the resonance point, which suppresses the increase in the amplitude at the resonance point. It is possible to obtain the effect of sufficient quality control to obtain the damping effect of the oil film, and the effect of eliminating the problems due to the improvement of rigidity.In addition, it increases even when the continuous operation at low speed is impossible or when decelerating. As in the case of the high speed, there is an advantage that the increase in the amplitude at the resonance speed is prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a rotation control device for a turbocharger according to the present invention.

FIG. 2 is a process flow chart showing an example of the operation of the present embodiment.

FIG. 3 is a curve diagram showing the relationship between the passing acceleration near the resonance point and the amplitude.

FIG. 4 is a curve diagram showing the relationship between the magnitude of rotation speed and acceleration.

FIG. 5 is an explanatory diagram showing vibration modes of a turbocharger.

[Explanation of symbols]

 1 ... Turbocharger 3 ... Rotating electric machine 5 ... Battery 6 ... Controller 11 ... Turbine 12 ... Rotating shaft 13 ... Compressor

Claims (2)

[Claims] 1. A rotation control device for a turbocharger, which suppresses an increase in vibration at a resonance rotational speed caused by the operation of the turbocharger, comprising: a rotary electric machine that is mounted on a rotary shaft of the turbocharger and serves as a motor-generator; A rotation control of a turbocharger, comprising: a control mechanism that accelerates the passage of a resonance point by energizing / de-energizing a rotating shaft by operating control of the rotating electric machine when the rotation speed of the charger reaches a vicinity of the resonance rotation speed. apparatus. 2. The control mechanism electrically controls the rotating electric machine when the turbocharger reaches the vicinity of the resonance speed during acceleration, and controls power generation when the turbocharger reaches the vicinity of the resonance speed during deceleration. The rotation control device for a turbocharger according to claim 1. [0001]