JPH04330332A - Controller of turbocharger with rotary electric machine - Google Patents

Abstract

PURPOSE:To decrease bad influence of an auxiliary machine based on any decrease in voltage of a battery caused by mass current at the time of electric drive of a rotary electric machine of a turbocharger with the rotary electric machine installed on an engine. CONSTITUTION:A rotational electric machine 3 is arranged on the rotary shaft 2c of a turbocharger 2 mounted on an engine 1, current is supplied from a battery 5 to the rotary electric machine 3, and supercharged pressure to the engine 1 is increased by electrical driving. In this case, the terminal voltage of the battery 5 is monitored by a controller 6, and a current to the rotary electric machine 3 is decreasingly controlled without giving the operation of an auxiliary machine 7 any bad influence, caused by a decrease in the terminal current.

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 with a rotating electrical machine that maintains battery voltage during electric drive of the rotating electrical machine in an engine equipped with the turbocharger.

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 for attaching a rotating electric machine to this type of turbocharger and driving the rotating electric machine electrically or generating electricity depending on the operating state of the engine.

As such a proposal, for example, the present applicant has proposed an operation control means for controlling the operation of a rotating electrical machine, an engine operation detection means, and a system for operating the operation control means based on a signal from the operation detection means to control rotation. JP-A-63-272907 discloses a control device for a turbocharger with a rotating electric machine, which includes a control means for controlling supercharging operation of the electric machine.

0004

[Problems to be Solved by the Invention] In the proposal shown in the above-mentioned publication, when a rotating electric machine is electrically driven, a large current is supplied from the battery that serves as its power source, so the battery terminal voltage drops significantly and the auxiliary equipment , especially when the illuminance of lights decreases,
There is a problem in that this adversely affects the function of the control mechanism for controlling exhaust gases.

The present invention was made in view of these problems, and its purpose is to monitor the terminal voltage of the battery during the electric drive of the rotating electric machine attached to the turbocharger, thereby controlling the auxiliary equipment installed in the vehicle. An object of the present invention is to provide a control device for a turbocharger with a rotating electric machine that reduces the adverse effects on the motor.

[0006]

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the present invention, power is supplied from an on-vehicle battery to a rotating electrical machine disposed on the rotating shaft of a turbocharger connected to an intake/exhaust flow path of an engine. A control device for a turbocharger with a rotating electric machine that controls supercharging operation by driving, comprising a voltage detection means for detecting a terminal voltage of the battery, and a supply current for energizing the rotating electric machine according to a signal from the voltage detection means. A control device for a turbocharger with a rotating electrical machine is provided, which has a supply current control means for controlling a turbocharger with a rotating electric machine.

[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 the present invention, and FIG. 2 is a processing flow diagram showing an example of its operation.

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, and 1d is a rotation sensor that detects the number of revolutions of the engine. The detected signals are sent 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 includes 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 control programs and controls for the engine, rotating electrical machinery, etc. It has various memory devices that store maps, input/output devices that receive outputs from various sensors, issue control instructions to the power converter 4, and the like. The terminal voltage of the battery 5 is detected, and a command is given to the power conversion unit 4 in accordance with the detected value to control the current supplied to the rotating electric machine 3.

Next, the operation of this embodiment configured as described above will be explained with reference to the processing flow diagram shown in FIG.

First, in step 1, it is determined whether or not the rotating electrical machine 3 is electrically driven. If it is electrically driven, the process proceeds to step 2, where the supply current value I is set from a map stored in the memory device, and step Proceeding to step 3, current I is applied to the rotating electrical machine 3 to start electric drive. Note that if the motor is not in operation in step 1, the process moves to step 8 and normal control of the rotating electric machine is performed.

When energization of the rotating electric machine 3 is started in step 3, the terminal voltage V of the battery 5 is changed in the next step 4.
B is read, and the voltage VB is compared with the lower limit setting value V* of the battery that does not interfere with the operation of the auxiliary equipment in step 5. If the voltage VB is lower than the value of V*, the auxiliary equipment Therefore, in step 6, the supply current value is changed to the supply current value obtained by subtracting the reduction value α from the supply current I, and the process proceeds to the next step 7.

Note that in the comparison in step 5, the voltage VB is
* If the voltage is higher than that, proceed directly to step 7. In step 7, it is determined whether or not to continue electric drive. If it is determined to continue, return to step 4, read the terminal voltage of battery 7, and proceed with the above-mentioned flow. Repeat. If the electric drive is to be stopped in step 7, the process proceeds to step 9, where the power is turned off, and the process proceeds to step 10, where normal control is entered.

In this way, when the rotating electrical machine 3 is electrically driven, the terminal voltage of the battery 5 is checked, and the current supplied to the rotating electrical machine is controlled so that the terminal voltage does not interfere with the operation of the auxiliary equipment. It turns out.

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 electrically driving a rotating electric machine installed in a turbocharger, consideration is given to the terminal voltage that decreases due to the internal resistance of the battery when power is applied, and a supplementary battery using the same battery as a power source is provided. Since the current supplied to the rotating electric machine is reduced to maintain the terminal voltage at a level that does not adversely affect the machine, the reduction in illuminance of the lights and the deterioration of the control mechanism for exhaust gas countermeasures can be minimized. Effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing one embodiment of 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 4...Power conversion section 5...Battery 6...Controller 7... Auxiliary equipment

Claims (2)

[Claims] 1. A control device for a turbocharger with a rotating electric machine, which supplies power from an on-vehicle battery to a rotating electric machine disposed on a rotating shaft of a turbocharger connected to an intake/exhaust flow path of an engine, and controls supercharging operation by electric drive. A turbo with a rotating electric machine, characterized in that it has a voltage detection means for detecting the terminal voltage of the battery, and a supply current control means for controlling the supply current when energizing the rotating electric machine according to a signal from the voltage detection means. Charger control device. 2. The supply current control means controls the supply current to the rotating electric machine in order to maintain a battery voltage at which the effect of battery terminal voltage drop due to energization to the rotating electric machine does not interfere with the operation of on-vehicle auxiliary equipment. 2. The control device for a turbocharger with a rotating electric machine according to claim 1, wherein