JPH06146912A - Control device for turbo rotary electric machine and variable a/r turbine - Google Patents

Abstract

PURPOSE:To improve boost pressure by switching the A/R step of a turbine while electrically driving a rotary electric machine installed on the turbine shaft of a turbocharger provided with the variable A/R turbine when an engine is accelerated fully. CONSTITUTION:A rotary electric machine 3 is installed on a turbocharger 1 provided with a turbine 11 in which an A/R step can be freely switched by means of a variable operating machine 16. Electric power from a battery 5 is transmitted to the rotary electric machine 3 through an electric power unit 4 for inereasing the boost pressure so as to attain a target boost pressure which is set on the basis of an engine rotational speed and an accelerator opening degree when an engine 2 is fully accelerated, and the A/R step of the turbine 11 is switched at a pressure maximum point in each step. It is, thus possible to quicken starting-up of boost pressure rise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbocharger equipped with a variable A / R turbine equipped with a rotating electric machine, which controls the rotating electric machine and the variable A / R turbine according to the operating condition of the engine. The present invention relates to a controller for a rotating electric machine and a variable A / R turbine.

[0002]

2. Description of the Related Art A rotary electric machine for electric-power-generating operation is attached to a rotary shaft of a turbocharger, and the rotary electric machine is energized to be electrically operated when the engine is under high load to assist the pneumatic operation from the turbocharger and to increase the boost pressure. The engine torque is increased by the increase. This is because the driver has a full accelerator (accelerator opening is 70% or more).
When the operation is performed, the boost pressure is compared with the target boost pressure (atmospheric pressure + 400 mmHg), and when the boost pressure is low, the rotary electric machine is electrically driven to increase the boost pressure, and the boost pressure exceeds the target value. When the atmospheric pressure is +500 mmHg, the energization is stopped. When the boost pressure is between the target boost pressure and the boost pressure at which the electric drive is stopped, normally, in the case of the boost pressure having an increasing tendency, the energizing current is reduced at a predetermined interval to set the boost pressure to the atmospheric pressure +400. The control is performed so as to be about 500 mmHg. In such a case, the variable A / R turbine is controlled by switching the A / R stage to about four stages according to the engine speed to control the boost pressure for the engine.

[0003]

As described above, the variable A /
In a turbocharger equipped with an R turbine and having a rotating electric machine attached to the turbine shaft, the variable A / R turbine is switched according to the engine speed, and the electric drive of the rotating electric machine is controlled based on the boost pressure value. It is controlled independently. For this reason, in the acceleration state, the switching between the A / R stages is switched before the maximum boost pressure in each stage is reached and the rise of the boost pressure is delayed, or the electric drive time of the rotary electric machine is lengthened accordingly. Becomes
The disadvantage that the amount of power consumption increases increases.

The present invention has been made in view of the above problems, and an object thereof is to electrically drive a rotary electric machine and use a variable A / V drive.
Provided is a control device for a turbo rotating electric machine and a variable A / R turbine, which is related to switching control of an R turbine, and which aims at early rise of boost pressure and reduction of power consumption of the rotating electric machine. .

[0005]

In order to achieve the above object, according to the present invention, a rotating electric machine is attached to a turbine shaft of a turbocharger equipped with a variable A / R turbine, and the rotating electric machine is used when the engine is fully acceleratored. In a control device for a rotary electric machine for turbo and a variable A / R turbine, which increases the supercharging air pressure by electrically driving the vehicle and switching the A / R stage of the turbine,
Electric drive means for setting a target boost pressure corresponding to the engine speed and accelerator opening and electrically driving the rotating electric machine based on the boost pressure setting value, and boost pressures for each A / R stage of the turbine. There is provided a control device for a rotary electric machine for turbo and a variable A / R turbine, which is provided with a switching control means for switching the A / R stage at the maximum point.

[0006]

[Function] When the engine is fully acceleratored, the electric rotating machine is electrically driven to assist the supercharging operation so that the supercharging air pressure to the engine reaches the target boost pressure, and the maximum boost at each A / R stage of the turbine. Since the A / R stage is switched in terms of pressure, the rise of supercharging air pressure rises, and the electric drive time of the rotary electric machine is shortened.

[0007]

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

FIG. 1 is a configuration block diagram showing an embodiment of a control device for a turbo rotating electric machine and a variable A / R turbine according to the present invention.

In the figure, 1 is a turbocharger,
The engine 2 is connected by an exhaust pipe 21 and an intake pipe 22, and the turbine 11 is connected by exhaust gas passing through the exhaust pipe 21.
When the engine is driven, the torque rotates the compressor 13 directly connected to the turbine shaft 12, and the compressed air is operated to pump the supercharged air to the engine 2 through the intake pipe 22.

The turbine 11 in this embodiment is constructed so that the ratio of the sectional area A of the narrowest portion of the turbine scroll and the distance R from the shaft axis of the turbine, that is, the value of A / R is converted. Reference numeral 16 in the figure denotes the variable operating device. As shown in FIG. 2, the boost pressure characteristic differs depending on the A / R value. In a normal variable A / R turbine, the A / R value is reduced from the small A / R value depending on the engine rotation, for example, in four stages. Is switched to a large value, and switching control as shown in FIG. 3 is performed.

Reference numeral 3 in FIG. 1 denotes a rotating electric machine that serves as an electric-generator. A rotor 31 is attached to the turbine shaft 12, and a corresponding stator 32 is arranged in the housing 14.
Then, depending on the operating state of the engine 2, when the vehicle is stepped on to a full accelerator state where the accelerator opening is 70% or more under a high load, the electric power from the battery 5 via the power unit 4 electrically drives the rotating electric machine 3. The control is performed so that the boost pressure reaches a predetermined value, and when the exhaust energy has a margin, the rotary electric machine 3 is operated to generate electric power and the exhaust energy is controlled to be recovered as electric power. It is configured.

In the figure, reference numeral 23 is an engine rotation sensor for detecting the rotation speed of the engine 2, 24 is a boost pressure sensor for detecting the supercharging pressure, and 15 is a turbo rotation sensor for detecting the rotation speed of the turbine 11. The detection signal from the sensor is connected so as to be input to the controller described later.

The controller 6 is composed of a microcomputer, and is provided with a central control unit for performing arithmetic processing, various processing memories for storing arithmetic processing procedures and control procedures, predetermined data maps, and input / output ports. Then, when signals from the various sensors or the accelerator opening sensor 71 based on the depression of the accelerator pedal 7 are input, predetermined arithmetic processing is performed, and the power unit 4 is operated based on the stored data map and control procedure. A predetermined command is issued to the variable operating device 16 of the turbine or the turbine to electrically drive the rotary electric machine 3 or change the variable A / R.
It is configured so that appropriate switching control of the turbine is performed.

FIG. 4 is a processing flow chart showing an example of full accelerator target boost control (FATB control) of this embodiment, and FIG. 5 is a processing flow chart showing an example of control of the variable A / R turbine in this embodiment. The operation of this embodiment will be described with reference to these processing flow charts.

The FATB control in this embodiment is, for example, an accelerator opening of 70% or more and an engine speed of 4
Since the vehicle speed is set to 00 to 2700 rpm, the vehicle speed is 140 km / h or less, and the turbine speed is set to 1500 to 96000 rpm, in step 1 in FIG. 4, the signals input from the various sensors described above are checked, and if they match, The process proceeds to step 3, but if not, the process proceeds to step 2 and returns to the main control.

In step 3, a target boost pressure map preset according to the accelerator opening and engine speed is searched to find a target boost pressure value corresponding to the input signal. In step 4, the boost pressure sensor is detected. The boost pressure obtained by 24 is compared with the retrieved target boost pressure value.

When the target boost pressure value is exceeded, the routine proceeds to step 5, where the current instruction value supplied to the rotary electric machine 3 is reduced by a predetermined value to energize, and if the target boost pressure value is not reached, step 6 is performed. At 100m from the target boost pressure
The target boost pressure reduction value obtained by subtracting mHg is compared. If the target boost pressure reduction value is exceeded, the process proceeds to step 7. If the boost pressure tends to rise, the current supplied value is reduced by a predetermined value, and the target boost pressure reduction value is set in step 6. If the current is not reached, the power supply unit 4 is instructed to set the supplied current instruction value to the maximum value of 50 A, and the rotating electric machine 3
Electric drive is performed to raise the supercharging air pressure. Then, by such control, the boost pressure to the engine 2 is controlled so as to fall between the set target boost pressure −100 mmHg and the target boost pressure value.

The control of the variable A / R turbine is performed by the boost pressure from the boost pressure sensor 24 and the turbo rotation sensor 1
In accordance with the turbine speed from 5, the A / R variable control of 4 stages is performed, and the switching of the A / R stages is performed at the peak point of the boost pressure in each stage, and actually, depending on the engine rotation of the boost pressure. The switching point is determined based on the downward / upward trend.
Further, the variable A / R is switched even when the upper limit value of the turbine rotation and the maximum boost pressure are reached.

Then, at 11 in FIG. 5, it is checked whether or not the full accelerator control is being performed. At step 12, it is judged whether or not the variable stage of the turbine is four stages, and at step 13, it is judged whether the engine speed is increasing. Done. Here, when the full accelerator control is being performed, the variable stage is not 4 stages, and the engine speed is increasing, the process proceeds to step 14. If different from the above at each step, the process returns to the main program.

In step 14, whether or not the boost pressure is increasing is checked by the signal from the boost pressure sensor 24, and if it is increasing, the process proceeds to step 15 to check whether or not the boost pressure is a predetermined upper limit value. Is done. If the boost pressure is not increasing in step 14 or if the boost pressure is the upper limit value in step 15, step 17
Go to step 1 and increase the variable A / R step by one step.

If the boost pressure is not the upper limit value in step 15 and the turbine speed is the predetermined upper limit value in step 16, the variable A / R step is set to 1 in step 17.
It will be raised.

FIG. 6 shows the electric drive control and variable A as described above.
In the curve diagram showing the state of the boost pressure when the control of the / R turbine is executed, the control according to this embodiment shown by the solid line A has a faster rise of the boost pressure than the conventional control shown by the broken line B, and The electric drive time of the rotary electric machine can also be shortened.

Although the present invention has been described with reference to the above 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.

[0024]

According to the present invention as in the above embodiments,
In order to boost the turbocharger's supercharging operation by electrically driving the rotary electric machine so that the boost pressure to the engine reaches the target boost pressure during full accelerator operation, the variable A
Since the / R turbine is switched and controlled at the ascending point in each A / R stage, the rise of the supercharging air pressure rises more and the electric drive time of the rotating electric machine becomes shorter than the conventional control. Therefore, there is an advantage that the response of engine acceleration is improved and the power consumption from the battery is reduced.

[Brief description of drawings]

FIG. 1 is a turbo rotating electric machine and a variable A / R according to the present invention.
FIG. 3 is a configuration block diagram showing an embodiment of a turbine control device.

FIG. 2 is a curve diagram showing a relationship between A / R of a turbine and boost pressure.

FIG. 3 is a curve diagram of boost pressure characteristics of a variable A / R turbine.

FIG. 4 is a processing flow chart showing an example of control during full accelerator operation in the present embodiment.

FIG. 5 is a process flow chart showing an example of control of the variable A / R turbine in the present embodiment.

FIG. 6 is an explanatory diagram showing a comparison of boost pressure and electric drive states in the present embodiment and conventional control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Turbocharger 2 ... Engine 3 ... Rotating electric machine 4 ... Electric power part 5 ... Battery 6 ... Controller 11 ... Turbine 16 ... Variable operation device 23 ... Engine rotation sensor 24 ... Boost pressure sensor 71 ... Accelerator opening sensor

Claims (1)

[Claims] 1. A rotary electric machine mounted on a turbine shaft of a turbocharger equipped with a variable A / R turbine, and when the engine is fully acceleratored, the rotary electric machine is electrically driven and the A / R of the turbine is A / R.
In a control device for a rotary electric machine for turbo and a variable A / R turbine that increases supercharging air pressure by R-stage switching, a target boost pressure corresponding to the engine speed and accelerator opening is set to set the boost pressure. Electric drive means for electrically driving the rotary electric machine based on the value, and each A / of the turbine
A control device for a rotary electric machine for turbo and a variable A / R turbine, comprising: a switching control means for switching the A / R stage at a maximum point of boost pressure in the R stage.