JPH04342828A - Control device for turbocharger provided with rotary electric equipment - Google Patents

Abstract

PURPOSE:To enhance the startability so as to reduce detrimental affection by exhaust gas without increasing the compression ratio of a diesel engine by operating a turbocharger incorporating a rotary electric equipment disposed in the Diesel-engine, before start of an engine. CONSTITUTION:A rotary electric machine 8 is attached to the rotary shaft 2c of a turbocharger 2 provided in an engine 1, and is electrically driven by a power from a battery 5 before cranking, in accordance with output signals from a key switch 7 and a water temperature sensor 1d, so as to enhance the supercharging pressure, thereby it is possible to enhance the startability.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a turbocharger equipped with a rotating electrical machine, which is intended to improve air pollution caused by exhaust gas when starting a diesel engine equipped with a turbocharger equipped with a rotating electrical machine.

0002

2. Description of the Related Art In recent years, turbochargers have been widely used, which rotate a turbine using engine exhaust energy and drive a compressor using the turbine torque to forcefully feed supercharged air to the engine. Various proposals have been made by the present applicant to arrange a rotating electric machine in this type of turbocharger and to perform electric drive or power generation operation depending on the operating state of the engine.

On the other hand, a supercharger installed in the intake pipe of an internal combustion engine is installed on the same rotating shaft as the starting motor of the internal combustion engine, and is connected via a power locking/disengaging device. It is disclosed in the publication No.

0004

[Problems to be Solved by the Invention] By the way, the compression ratio is increased in order to prevent deterioration in the starting performance of diesel engines when cold, but this results in deterioration of exhaust smoke and increase in nitrogen oxides. To prevent this, if you increase the engine intake pressure before starting the engine, that is, before cranking, the compression end temperature will increase and exhaust smoke and NOx can be reduced. The proposal presented in the publication has a problem in that it is impossible to obtain supercharging air from the supercharger before cranking.

The present invention was made in view of these problems, and its purpose is to improve the starting performance of a diesel engine without increasing the compression ratio of the diesel engine by using a rotating electric machine disposed within the turbocharger. An object of the present invention is to provide a control device for a turbocharger with a rotating electrical machine that prevents deterioration of exhaust gas.

[0006]

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the present invention, a rotating electric machine disposed on the rotating shaft of a turbocharger connected to an intake/exhaust flow path of a diesel engine is electrically driven to provide power to the engine. A control device for a turbocharger with a rotating electrical machine that controls supercharging pressure includes water temperature detection means for detecting a cooling water temperature of the diesel engine, and a control device for controlling the rotating electrical machine in response to a signal from the water temperature detection means when starting the engine. A control device for a turbocharger with a rotating electric machine is provided, which includes a drive control means for electrically driving.

[0007]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

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

First, in FIG. 1, reference numeral 1 denotes an engine that drives a vehicle (not shown) using the combustion energy of air taken in through an intake pipe 1a and fuel supplied. The exhaust gas after combustion is discharged. 1c is an accelerator sensor that detects the amount of accelerator pedal depression, 1d is a water temperature sensor that detects the engine cooling water temperature, and 1e is a rotation sensor, each of which sends a detected signal to a controller 6, which will be described later.

A turbocharger 2 is connected to an exhaust pipe 1b and an intake pipe 1a, and has a turbine blade 2b driven by exhaust gas and a compressor blade 2a that pressure-feeds supercharged air to the intake pipe 1a. A rotating electric machine (TCG) 3 that operates as a motor or a generator is attached to a rotating shaft 2c that connects these blades.

The rotating electric machine 3 has a rotor 3a and a stator 3b, and when the rotor 3a is driven to rotate by exhaust energy, alternating current power is generated in the stator 3b, and a power conversion section (power section) 4 that becomes a power circuit is connected to the rotor 3a. Power is transmitted to the battery 5 via the battery 5.

Furthermore, when the rotor 3a is driven by the power from the battery 5 via the power converter 4, the intake air is compressed by the operation of the compressor blade 2a, and the intake pipe 1
The engine 1 is supercharged via a. Note that 1e is a boost pressure sensor that detects supercharging pressure due to the operation of the compressor blade 2a and transmits it to the controller 6.

[0013] The power converter 4 is connected to the stator 3 when the generator is in operation.
AC power from the battery 5 is inputted and converted into charging power for the battery 5, for example, or DC power from the battery 5 is converted into predetermined AC power when the rotating electric machine 3 is electrically driven. Therefore, in addition to a rectifier circuit and a smoothing circuit that convert AC to DC, it is equipped with an inverter, a booster circuit, etc. that convert DC to AC, and the AC frequency to be converted, its voltage, and power are controlled by commands from the controller 6. It is.

The controller 6 is composed of a microcomputer, and has a central processing unit that performs calculations based on the operating state of the engine 1 and signals from various sensors, a memory for the results of these calculations, and a control program for the engine, rotating electric machine, etc. It has various memory devices for processing, input/output devices for receiving outputs from various sensors, and issuing control instructions to the power converter 4 and the like. In this embodiment, when starting the engine, a decision is made to issue a control command for electrically driving the rotating electric machine 3 to the power converter 4 in accordance with signals from the key switch 7 operated by the driver and the water temperature sensor 1d. It is composed of

FIG. 2 is a processing flow diagram showing an example of the operation of this embodiment. Next, the operation of this embodiment will be explained using this figure.

In step 1, a check is made to see if the key switch 7 has been turned on, and if the key switch has been turned on, the process proceeds to step 2, where the water temperature sensor 1d is turned on.
Read the temperature signal from.

In step 2, it is determined whether the temperature signal Tw of the water temperature sensor 1d has reached a predetermined water temperature value T*,
If it has been reached, the process moves to normal control in step 9.
If the target is not reached, proceed to step 3 and issue a command to the power conversion unit 4 to start electric drive of the rotating electrical machine 3, and
Pressure-feeding supercharging air to the engine 1 by the pneumatic operation of a,
In step 4, the process waits for a predetermined time.

[0018] In step 5, check that the starter is energized,
If the engine is started by the signal from the rotation sensor 1e in step 6, the electric drive of the rotating electrical machine 3 is stopped in step 7, and the process proceeds to step 8, where normal control of the rotating electrical machine starts. If it is not turned on, the process moves to step 10, where the electric drive of the rotating electrical machine is temporarily stopped, and after waiting a period of time, the process returns to step 1 and the above-described flow is repeated.

Note that even if the engine 1 is not started in step 6, the electric drive of the rotating electrical machine 3 continues as long as cranking is continued (steps 5→6→5).

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

[0021]

As described above, according to the present invention, when starting a diesel engine when it is cold, before cranking is performed by the starter, Since the supercharging pressure can be increased by electrically driving the electric machine, it is possible to increase the compression end temperature at startup without increasing the compression ratio of the engine, thereby reducing exhaust gas smoke and N
The effect of reducing the adverse effects of Ox and the like can be obtained.

[Brief explanation of the drawing]

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

FIG. 2 is a processing flow diagram showing an example of the operation of this embodiment.

[Explanation of symbols]

1...Engine 2...Turbocharger 3...Rotating electric machine 6...Controller 7...Key switch 1d...Water temperature sensor

Claims (1)

[Claims] In a control device for a turbocharger with a rotating electrical machine that controls supercharging pressure to the engine by electrically driving a rotating electrical machine disposed on a rotating shaft of a turbocharger connected to an intake/exhaust flow path of a diesel engine, the cooling water temperature of the diesel engine is controlled. A control device for a turbocharger with a rotating electric machine, comprising: a water temperature detection means for detecting the water temperature; and a drive control means for electrically driving the rotating electric machine according to a signal from the water temperature detection means at the time of starting the engine. .