JPH07324629A - Turbo-charger control device - Google Patents

Abstract

PURPOSE:To surely prevent the over speed running of a turbine while the dynamo electric machine is highly loaded and generates electricity by controlling the flow rate of the fuel supplied to an engine so as to reduce it when the output electric current value of the rotary electric machine becomes a specified value or less. CONSTITUTION:Whether or not the rotary electric machine of a turbo-charger 4 is generating electricity is checked by means of the signal from an inverter control circuit 5, and if the rotary electric machine is generating electricity, whether or not an electric motor 3 is outputting is checked by means of the signals from current sensors 7, 8, and 9, and if the motor is outputting, the current of the motor 3 is measured, and the measured value is stored in a memory device. In the next step, the target current value is read out from the memory device, and the difference between the target current value and the current value of the motor 3 is calculated, and whether or not the difference is larger than a predetermined value is checked. If it is larger, the fuel control device of a fuel injection pump 2 is operated to control the fuel flow rate so as to reduce it or cut off the flow of fuel. As a result, turbine work is reduced so that the over speed of the turbine can be surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine equipped with a turbocharger equipped with a rotating electric machine, in which a motor-generator is attached to a rotary shaft of a turbocharger. The present invention relates to a turbocharger control device capable of preventing an abnormal rise.

[0002]

2. Description of the Related Art A turbocharger with a rotating electric machine, in which a motor-generator is attached to the rotary shaft of a turbocharger, is disclosed as an example in Japanese Patent Laid-Open No. 62-48932. The turbocharger disclosed in the publication is provided with a boost sensor which is means for detecting boost pressure of the internal combustion engine. And when the boost pressure reaches the set value,
The motor-generator is controlled to operate as a generator and the power is absorbed. As a result, the rotational speed of the turbine is reduced, and the overspeed of the turbine rotational speed is prevented.

On the other hand, Japanese Laid-Open Patent Publication No. 5-280364 discloses a turbocharger with a rotating electric machine, in which a motor-generator is attached to the rotary shaft of the turbocharger, when the atmospheric pressure drops in high altitudes. Disclosed is a control device that opens the wastegate valve from the boost pressure and the turbine speed even if the boost pressure is less than a set value, because the control cannot prevent overspeed of the turbine speed. . However, when a turbocharger with a rotating electric machine in which a motor-generator is attached to the rotary shaft of the turbocharger is in a high-load power generation state and a decrease in generated power due to an abnormality on the load side occurs, the above-mentioned Japanese Patent Application Laid-open No. 5-2
In the control device disclosed in Japanese Patent No. 80364, the boost pressure of the internal combustion engine rises rapidly, and it is not possible to perform control with sufficient responsiveness.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to generate electric power due to an abnormality on the load side when the rotating electric machine of a turbocharger with a rotating electric machine, in which a motor-generator is attached to the rotating shaft of the turbocharger, is in a high load power generation state. It is an object of the present invention to provide a turbocharger control device capable of reliably preventing an overspeed of a turbine speed when a reduction in electric power occurs.

[0005]

In order to achieve the above main object, according to the present invention, in an internal combustion engine equipped with a turbocharger with a rotating electric machine in which a motor-generator is attached to a rotary shaft of a turbocharger, The rotary electric machine of the turbocharger with an electric machine is provided with a detecting means for detecting whether or not the rotary electric machine is generating electric power, and an output current detecting means for the rotary electric machine, and the rotary electric machine operates as a generator according to a signal of the detecting means during the electric power generation of the rotary electric machine. When comparing the value of the output current detection means and the target current value stored in advance, when the value of the output current detection means is outside the allowable range of the target current value of the internal combustion engine There is provided a control device for a turbocharger, which is characterized by controlling the operation of a fuel supply amount control device.

[0006]

When the rotating electric machine of the turbocharger with a rotating electric machine in which the motor-generator is attached to the rotating shaft of the turbocharger is in the power generating state, the output current value of the rotating electric machine is constantly detected and the current value becomes equal to or less than the set value. In this case, the flow rate of fuel supplied to the internal combustion engine is controlled to be reduced. This reduces exhaust gas energy and reduces turbine work,
It is possible to reliably prevent the turbine speed from overspeeding.

[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 according to the present invention. Reference numeral 1 in the figure is an internal combustion engine, and a diesel engine is assumed in this embodiment.
Reference numeral 2 denotes a fuel injection pump, which is provided with an electric fuel flow rate control device (not shown), for example, a fuel cut solenoid valve. 3 is an electric motor, and in this embodiment, 4
This is illustrated as a load when the rotating electric machine of the turbocharger with the rotating electric machine operates as a generator. Reference numeral 4 denotes a rotary electric machine of a turbocharger with a rotary electric machine, which is disclosed in Japanese Patent Application Laid-Open No. 3-117629, so its configuration will be omitted here. Reference numeral 5 denotes an inverter control circuit, which converts electric power of a battery (not shown) into three-phase AC power to supply electric power to the rotary electric machine 4 when the rotary electric machine 4 operates as an electric motor. When operating as an electric machine, it is converted into three-phase electric power for driving the electric motor 3 to supply electric power to the electric motor 3, and when the generated electric power has a surplus, three-phase AC electric power is generated. To DC to charge the battery. Further, the inverter control circuit 5 has a controller composed of a microcomputer, and performs a central processing unit for performing arithmetic operations based on signals from various sensors (not shown) indicating the operating state of the engine, the arithmetic operation results and the engine, It has various memory devices for storing control programs and various maps of the rotating electric machine, various input / output devices, and the like. Reference numeral 6 denotes a control circuit, which has a controller composed of a microcomputer, and which receives various signals from the current sensors 7, 8 and 9 and stores various programs for storing a program for controlling the fuel flow rate control device of the fuel injection pump 2. , An input / output device for receiving the input of the current sensor and issuing a control command to the fuel flow rate control device. The current sensors 7, 8 and 9 are current sensors that detect the current supplied from the inverter control circuit 5 to the electric motor 3.

Next, the operation of the present invention will be described. Figure 2
In step 1, first, it is checked whether or not the rotary electric machine of the turbocharger is generating power by the signal from the inverter control circuit 5 in step 1, and if it is generating power, the process proceeds to step 2.
If power is not being generated, proceed to step 7. In step 2, it is checked by the signals of the current sensors 7, 8 and 9 whether or not the electric motor 3 is outputting. If it is outputting, the process proceeds to step 3, and if it is not outputting, the process proceeds to step 7. In step 3, the current (I) of the electric motor 3 is measured by the signals of the current sensors 7, 8 and 9, and the value is stored in the memory device, and the process proceeds to step 4. In step 4, the target current value (It) is read from the memory device and the process proceeds to step 5. In step 5, a difference (It-I) between the target current value (It) and the current (I) of the electric motor 3 is calculated, and whether the difference is larger than a predetermined value (K) or not. Is checked, and if it is large, the process proceeds to step 6, and if it is not large, the process proceeds to step 8. In step 6, the fuel flow rate control device of the fuel injection pump 2 is operated to control the fuel flow rate so as to reduce or cut the fuel flow rate. As a result, exhaust gas energy is reduced and turbine work can be reduced. Then return to step 1.

When the process proceeds from step 1 to step 7 or step 2 to step 7, the process waits at step 7 and returns to step 1. When the process proceeds from step 5 to step 8, since the electric current of the electric motor 3 is within the target range, the fuel flow rate control device is deactivated in step 8 and the process returns to step 1.

Next, another embodiment of the present invention is shown in FIG. FIG. 3 differs from FIG. 1 in that the fuel flow control device of the fuel injection pump 2 and the waste gate valve 18 are used to control an abnormal condition.
The description is omitted because it is different only in that the solenoid 19 is used.

Although the present invention has been described with reference to the above-mentioned embodiments, various modifications and applications are possible within the scope of the gist of the present invention, and these modifications and applications are not excluded from the scope of the present invention. Absent.

[0013]

According to the present invention as in the above embodiments,
When the rotating electric machine of the turbocharger with rotating electric machine in which the motor-generator is attached to the rotating shaft of the turbocharger is in the power generating state,
The output current value of the rotary electric machine is constantly detected, and when the current value becomes equal to or less than a set value, the flow rate of the fuel supplied to the internal combustion engine is reduced. This has the advantage that exhaust gas energy is reduced, turbine work is reduced, and turbine speed overspeed can be reliably prevented.

[Brief description of drawings]

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

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

FIG. 3 is a configuration block diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Engine 2 Fuel Injection Pump 3 Electric Motor 4 Turbocharger with Rotating Electric Machine 5 Inverter Control Circuit 6 Control Circuit 7 Current Sensor 8 Current Sensor 9 Current Sensor

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Claims (2)

[Claims] 1. An internal combustion engine equipped with a turbocharger equipped with a rotating electric machine, wherein a motor-generator is attached to a rotary shaft of the turbocharger, and means for detecting whether or not the rotating electric machine of the turbocharger equipped with the rotating electric machine is generating power. And an output current detecting means of the rotating electric machine, which is stored in advance with a value of the output current detecting means when the rotating electric machine is operating as a generator according to a signal of the detecting means during the power generation of the rotating electric machine. And controlling the fuel supply amount control device for the internal combustion engine when the value of the output current detecting means is outside the allowable range of the target current value. apparatus. 2. The fuel supply amount control device and the waste gate valve of the internal combustion engine are operated and controlled when the value of the output current detecting means is outside the allowable range of the target current value. Controller for the described turbocharger.