JPH0533666A - Controller of turbocharger with dynamo-electric machine - Google Patents

Abstract

PURPOSE:To reduce the smoke quantity by driving a dynamo-electric machine attached to a turbocharger electrically according to a signal out of a smoke quantity detecting means set up in an exhaust gas passage in a diesel engine, and energizing its supercharging operation. CONSTITUTION:A light emitter 2e and a light receiving sensor 2f are attached to an exhaust pipe 2d for exhaust gas out of a turbocharger 2 equipped with a dynamo-electric machine 3. A signal value of smoke content out of this light receiving sensor 2f is compared with a reference value by a controller 6. When the signal value is larger than the reference value, electric power out of a battery 5 is supplied to the dynamo-electric machine 3 via a power converter 4, and electric drive takes place, through which supercharging pressure in the turbocharger 2 is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a turbocharger equipped with a rotary electric machine, in which a rotary electric machine is mounted on a turbine shaft of a turbocharger and the rotary electric machine is driven and controlled based on the amount of smoke of exhaust gas.

[0002]

2. Description of the Related Art In a vehicle equipped with a large diesel engine, a large amount of smoke is generated in the exhaust gas at the time of starting or climbing a hill, which poses a problem as pollution polluting the atmosphere.

On the other hand, it has been practiced to drive a turbocharger with exhaust energy, and to supply supercharged air to the engine by the pressure operation of the turbocharger to increase engine output. There are various proposals in which the rotary electric machine is electrically driven according to the operating state of the engine to assist the pressure operation of the turbocharger, or the power generation operation is performed to recover the exhaust energy into electric power.

As an example of such a proposal, a control device for a turbocharger with a rotating electric machine by the present applicant is shown in Japanese Patent Laid-Open No. 1-117933.

[0005]

A control for increasing the boost pressure to the engine can be considered as a measure for reducing the smoke in the exhaust gas as described above. Control is usually performed by a signal from a detection means based on the accelerator pedal or a detection means based on the rotation of the engine, and it does not sense the smoke actually discharged, so appropriate smoke reduction measures are taken. There is a problem of not being understood.

The present invention has been made in view of the above problems, and an object thereof is to directly detect a smoke concentration to be discharged to electrically drive a rotating electric machine to bias a supercharging operation, An object of the present invention is to provide a control device for a turbocharger with a rotating electric machine that attempts to suppress the generation of smoke.

[0007]

In order to achieve the above object, according to the present invention, a rotary electric machine is arranged on a turbine shaft of a turbocharger, and electric power is supplied from a battery to the rotary electric machine to electrically drive the rotary electric machine. In a control device of a turbocharger with a rotating electric machine for energizing the supercharging operation of the turbocharger, a smoke amount detecting means for detecting a smoke concentration provided in an exhaust gas flow path of the turbocharger, and a smoke amount detecting means from the smoke amount detecting means. There is provided a control device for a turbocharger with a rotating electric machine, comprising: a smoke control means for increasing an electric power supplied to the rotating electric machine according to a signal to reduce a smoke amount.

[0008]

According to the present invention, the light emitting device and the light receiving sensor for receiving the light of the light emitting device are arranged at opposite positions across the exhaust gas flow path of the turbocharger to detect the smoke concentration, and rotate according to the smoke concentration. Since the boost pressure to the engine is increased by electrically driving the electric machine, the smoke concentration in the exhaust gas is suppressed.

[0009]

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

FIG. 1 is a block diagram showing the configuration of an embodiment of a control device for a turbocharger with a rotary electric machine according to the present invention.

In FIG. 1, reference numeral 1 denotes a large diesel engine (engine) for driving a vehicle (not shown) by combustion energy of air sucked through an intake pipe 1a and supplied fuel. The exhaust gas after combustion is discharged through the exhaust pipe 1b. Reference numeral 1c is an accelerator sensor that detects the amount of depression of the accelerator pedal, and 1d is a rotation sensor that detects the number of revolutions of the engine, and sends detection signals to a controller, which will be described later.

Reference numeral 2 denotes a turbocharger connected to the exhaust pipe 1b and the intake pipe 1a, which includes a turbine blade 2b driven by the energy of the exhaust gas and a compressor blade 2a for sending supercharged air through the intake pipe 1a. A rotary electric machine (TCG) 3 that is electrically driven or operates to generate electricity is attached to a rotary shaft 2c that connects the blades. Then, in the exhaust pipe 2d, which serves as a flow path of the exhaust gas after driving the turbine blade 2b, a light receiving sensor 2f for detecting smoke concentration and a light emitting device 2e for sending light to the light receiving sensor 2f cross the gas flow path. The signal from the light receiving sensor 2f is connected to the input circuit of the controller 6.

The rotating electric machine 3 is provided with a rotor 3a and a stator 3b, and when a predetermined electric power is supplied to the stator 3b from a power converter 4 using a battery 5 as a power source, the rotor 3a is rotationally driven to drive the compressor blade 2a. It is configured to assist the pressure air operation and to supply the supercharged air that has been urged to the engine 1 via the intake pipe 1a. 1e is a boost pressure sensor that detects the boost pressure to the engine 1 and sends the detection signal to the controller 6.

The power converter 4 is provided with an inverter circuit, converts DC power from the battery 5 into AC power of a predetermined frequency and causes the rotating electric machine 3 to power, and the conversion command is controlled by the controller 6.

The controller 6 is composed of a microcomputer, and includes a central control unit for performing arithmetic processing, various arithmetic processing procedures and control procedures, various memories for storing a drive map for electrically driving the rotary electric machine, a smoke level reference value map, and the like. / Equipped with an output port. Then, when signals from the various sensors are input, predetermined arithmetic processing is performed, and based on a stored control map or procedure, for example, a control command is issued to the power converter 4 to cause the rotating electric machine 3 to perform power running, and the engine is operated. It is configured to control the boost pressure to 1.

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

In step 1 in FIG. 2, the engine speed and the accelerator depression amount are read from the signals from the rotation sensor 1d and the accelerator sensor 1c, and it is determined whether or not the boost pressure is required to be discharged. The smoke concentration of the gas is detected by the signal from the light receiving sensor 2f which receives the light beam from the light emitting device 2e. When the rotary electric machine 3 is electrically driven to increase the boost pressure, the process proceeds from step 2 to step 3, the supply electric power is determined from the drive map of the rotary electric machine, and the electric drive of the rotary electric machine 3 is started in step 4.

In step 5, the amount of smoke in the exhaust gas is measured by the signal from the light receiving sensor 2f, and the measured value is compared with the reference value of the smoke concentration stored in step 6.
If it exceeds the reference value, the process proceeds to step 7, the electric power supplied to the rotating electric machine 3 is increased, the supercharging pressure to the engine 1 is increased to reduce smoke, and then the process returns to step 5 to smoke. The quantity is measured and the control is repeated.

On the other hand, if the rotary electric machine 3 is not electrically driven in step 2, the process proceeds to step 8 and the smoke amount detection value in step 1 is compared with the density reference value. Then, when the detected value is low, the electric motor drive is not performed and the control of the normal rotating electric machine is started (steps 9 and 10), but when the detected value is high, the process proceeds to step 11 to set the initial drive power of the rotating electric machine 3. In step 12, the drive power is supplied to start the electric drive to reduce the amount of smoke.

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

[0021]

As described above, according to the present invention, the smoke concentration in the actual exhaust gas is detected by the light receiving sensor provided in the exhaust pipe from the turbocharger 2.
If the detected value is large by comparing the detected value with the reference value,
Since the rotary electric machine of the turbocharger is electrically driven to assist the pneumatic operation and increase the boost pressure to supply it to the engine, the amount of air increases and the smoke level in the exhaust decreases, which is more effective than before. Measures to reduce the amount of smoke can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a turbocharger with a rotating electric machine according to the present invention.

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

[Explanation of symbols]

1 ... engine 2 ... Turbocharger 2d ... Discharge pipe 2e ... light emitter 2f ... Light receiving sensor 3 ... Rotating electric machine 5 ... Battery 6 ... Controller

Claims (2)

[Claims] Claim: What is claimed is: 1. A turbocharger with a rotating electric machine, comprising: a rotating electric machine disposed on a turbine shaft of a turbocharger; In the device, a smoke amount detecting means for detecting a smoke concentration provided in an exhaust gas flow path of the turbocharger, and an electric power supplied to the rotating electric machine are increased in response to a signal from the smoke amount detecting means to reduce a smoke amount. A control device for a turbocharger with a rotating electric machine, comprising: 2. The smoke amount detecting means is a light emitting device which is arranged at an exhaust pipe of a turbocharger and is provided at an opposite position across a gas flow path, and a light receiving sensor which receives a light beam of the light emitting device. A control device for a turbocharger with a rotating electric machine according to claim 1.