JPH06323154A - Power control device for vehicle - Google Patents

Abstract

PURPOSE:To save fuel consumption by actuating an alternator only in the case that a storage amount of a battery is a prescribed value or less, in the case of charging the battery in a vehicle whose engine is provided with a turbocharger with dynamo-electric machine. CONSTITUTION:A rush current from a battery 2 in the initial electric power driving to a power converter 3 of a dynamo-electric machine 13, mounted on a turbocharger 1, is measured by an ammeter 21, and in this point of time, a terminal voltage drop is measured by a volt meter 22. Based on a measured value of both the meters, a storage amount of the battery 2 is calculated by a controller 6, and only in the case that this storage amount is smaller than a prescribed lower limit value, a low voltage signal is fed to an S terminal of a generator 4, to charge the battery 2 by actuating the generation of electricity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power control device for effectively utilizing electric power in a vehicle equipped with a turbocharger equipped with a rotating electric machine.

[0002]

2. Description of the Related Art Turbochargers that use exhaust energy to increase the intake pressure of an engine are widely used.
A rotary electric machine is attached to the turbine shaft of a turbocharger of this type, and depending on the operating state of the engine, for example, when the rotation speed is low and the load is high, the rotary electric machine is electrically driven to urge turbine torque to raise the supercharging pressure, or At the time of high-speed rotation, exhaust energy with a margin is regenerated into electric power by a power generation operation of a rotating electric machine and used as electric power for charging a vehicle-mounted battery.

On the other hand, a generator attached to an engine is attached to a vehicle and is used for charging a battery. In the Japanese Patent Application No. 76726 filed by the applicant of the present application in 1991, the rotating electric machine is electrically driven. There is disclosed a power control device for a turbocharger with a rotating electric machine that attempts to improve fuel efficiency and acceleration performance of an engine by cutting off power supply from a generator that sometimes charges a battery.

[0004]

In a vehicle equipped with a turbocharger with a rotating electric machine as described above, there are two methods for charging a battery: the rotating electric machine and a conventional generator.
And, in terms of energy saving, it is desirable to preferentially use the power generation output of the rotary electric machine using exhaust energy, but normally, such consideration is not made between the rotary electric machine output and the generator output, Even in the proposal of the above-mentioned patent application, the generator for battery charging is controlled when the rotating electric machine is electrically driven, but there is a problem that the generator is not controlled when the rotating electric machine is generating electricity.

The present invention has been made in view of the above problems, and an object thereof is to charge a battery by the output of the rotating electric machine at the time of power generation operation in a vehicle equipped with a turbocharger with a rotating electric machine. An object of the present invention is to provide an electric power control device for a vehicle that intends to reduce the fuel consumption of an engine by controlling the generator output according to the state of charge of the vehicle.

[0006]

In order to achieve the above object, according to the present invention, there is provided a rotating electric machine arranged in a turbocharger for electric / power generating operation, and a generator coupled to an engine for charging a battery. In a power control device for a vehicle, which is provided with a detection means for detecting the amount of electricity stored in the battery, and a charging generator whose power generation function is freely controlled based on the level of applied voltage A power control device for a vehicle is provided for applying a detection signal of a detection means.

[0007]

The large electric power in the initial stage of driving the rotating electric machine is loaded on the battery to detect the amount of stored electricity, and only when the detected amount of stored electricity is smaller than a predetermined value, the generator coupled to the engine is operated to generate electricity. Fuel economy is reduced.

[0008]

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 vehicle power control device according to the present invention, and FIG. 2 is a circuit diagram of an example of a generator used in this embodiment.

In these drawings, reference numeral 1 denotes a turbocharger, which is a turbine 11 driven by energy of exhaust gas discharged from an engine, and a compressor 12 driven by the turbine torque to pump intake air to the engine.
And a rotary electric machine 13 is attached to a rotary shaft connecting these.

The rotary electric machine 13 operates as an electric motor or a generator depending on the operating state of the engine. When the engine is running at low rotation and high load, the electric power from the battery 2 is converted into AC electric power via the electric power converter 3. When it is supplied to the rotating electric machine 13, it powers and assists the pneumatic operation of the compressor 12 by energizing the turbine torque to raise the supercharging air pressure, and sends the air to the engine to increase the engine torque, or the engine rotates at high speed. When the exhaust energy has a margin, the rectifying mechanism of the electric power converter 3 converts the output of the rotating electric machine 13 to generate electric power, and regenerates electric power for charging the battery 2.

Reference numeral 4 denotes a generator which is connected to the engine and outputs a direct current for battery charging, which is a so-called alternator having an IC regulator, and as shown in FIG. 2, an output terminal B, a pilot lamp terminal L and a regulator voltage terminal. S and so on.

When this terminal S is connected to the output side of the generator 4, the output voltage of the generator 4 rises and Tr
When the Zener diode ZD exceeds the reference voltage via 3, Tr2 is turned on, Tr1 is turned off, and the current to the F winding is stopped, so that the output voltage is lowered. Further, when the output voltage becomes equal to or lower than the reference voltage of the Zener diode ZD, Tr2 is turned off and Tr1 is turned on, so that the current of the F winding is increased and the output voltage is increased. Is configured to be controlled by the magnitude of the voltage applied to the terminal S.

Numeral 5 is an auxiliary device of the vehicle, which is an electric device powered by the battery 2 such as lamps such as a head lamp and a tail lamp, a heater and a wiper, and 21 is an ammeter for indicating the input / output current of the battery 2. Detecting means, 23 is a voltmeter for detecting the terminal voltage of the battery 2, and the detection signals from these are connected so as to be inputted to the controller 6.

The controller 6 is composed of an electronic control unit, is provided with a central processing unit, various memories, input / output circuits, etc., and performs a predetermined calculation or processing according to an input signal, and the power converter 3 or the like. It is configured so that an appropriate command can be issued to the S terminal or the like of the generator 4.

FIG. 3 is a process flow chart showing an example of the operation of this embodiment. Next, the operation of this embodiment will be described with reference to the same figure.

First, in order to detect the amount of electricity stored in the battery 2,
In step 1, the ammeter 21 measures the input current to the TCG 13 at the beginning of electric driving of the rotating electric machine (TCG) 13, and the terminal voltage of the battery 2 at that time is measured by the voltmeter 2.
2, the map stored in the memory is searched on the basis of these detection signals, and the current storage amount of the battery is obtained.

Next, in step 3, the value of the stored amount of electricity is compared with a preset lower limit value, and if the present amount of stored electricity is small, the process proceeds to step 4, where the S terminal of the generator 4 is set to a low voltage value. A VL instruction is given, and if the current storage amount is large, in step 5 the S terminal is instructed to have a high voltage value VH.

Therefore, at the low voltage value VL, the battery 4 is charged because the generator 4 operates, but at VH, the battery 2 is not charged because the generator 4 is not excited, and the rotating electric machine is mainly used. It is charged by the output of 13 when the power generation is activated.

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.

[0020]

According to the present invention as in the above embodiments,
A heavy load is applied to the battery to detect the amount of electricity stored, and only when the amount of electricity stored is small, the engine torque is used to charge the battery with the output of the generator. As a result, the effect of reducing the fuel consumption of the engine can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a vehicle power control device according to the present invention.

FIG. 2 is a circuit diagram of an example of a generator used in this embodiment.

FIG. 3 is a process flow chart showing an example of the operation of the present embodiment.

[Explanation of symbols]

 1 ... Turbocharger 2 ... Battery 3 ... Power converter 4 ... Generator 6 ... Controller 13 ... Rotating electric machine 21 ... Ammeter 22 ... Voltmeter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Terauchi 8 Tsutana, Fujisawa City, Kanagawa Prefecture Isuzu Ceramics Laboratory Co., Ltd. (72) Inventor Kiyoshi Takeuchi 8th Shelf, Fujisawa City, Kanagawa Prefecture Isuzu Ceramics Research Co., Ltd. In-house

Claims (2)

[Claims] 1. A power control device for a vehicle, comprising: a rotating electric machine arranged in a turbocharger for electric / power generation operation; and a generator coupled to an engine for charging a battery,
A detection means for detecting the amount of electricity stored in the battery and a charging generator whose power generation function is freely controlled based on the level of the applied voltage are provided, and the detection signal of the detection means is applied to the generator. An electric power control device for a vehicle. 2. The detection means detects the amount of stored electricity based on the current supplied from the battery in the early stage of electric drive of the rotating electric machine and the state of decrease in the battery terminal voltage in the early stage of drive. Item 1. A vehicle power control device according to item 1.