JPH02119632A - Battery device of vehicle - Google Patents

Abstract

PURPOSE:To make it possible to operate auxiliary machinery without hindrance in a machine having rotary electrical machinery provided on a rotating shaft of a turbo-charger by exclusively providing an electricity accumulating means which accumulates electric power generated during the generating state of the rotary electrical machinery and supplies the accumulated electric power to the rotary electrical machinery during its electrically driven state. CONSTITUTION:An electrically driving mechanism 2 serving as an electric motor and a generator is arranged on a rotating shaft to connect the turbine 11 of a turbo-charger 1 with its compressor 12. In the case of a heavy load at the low rotating speed of an engine, electric power is supplied from a battery 3 to the mechanism 2 through an electric power converter 4 and a transformer 5 to make the mechanism 2 serve as the electric motor, and on the other hand, in the case of a light load, the mechanism 2 is served as the generator by exhaust energy to make regenerated electric power charge the battery 3. In this case, the battery 3 is provided apart from a battery 6 serving as an electric power source for auxiliary machinery 7, and both the batteries 3, 6 can be connected in series through a change-over relay 8. The battery 6 is charged with the electric power of an ordinary engine driven generator 61.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a battery device for a vehicle equipped with a turbocharger with a rotating electrical machine.

(Prior Art) Turbochargers have been known for a long time, in which a turbine is driven by exhaust gas energy discharged from an engine, and a compressor is attached to the rotating shaft of the turbine to supercharge the engine. JP-A-60-195329 discloses a proposal to arrange a rotating electrical machine that serves as an electric generator on the rotating shaft of a turbine, and to operate the rotating electrical machine electrically or generate electricity depending on the operating state of the engine. has been done.

In such rotating electric machines, for example, when increasing engine torque, the on-board battery is used as a power source to supply power to the rotating electric machine, which assists in supercharging the compressor and increases the intake pressure of the engine. .

(Problem to be solved by the invention) In the turbocharger with a rotating electric machine as described above,
For example, when power is transmitted from the battery to the rotating electrical machine,
A large current of 0 to 300 A (ampere) will flow, and as a result, the terminal voltage of the battery will drop below 10 V (volts), as shown in the battery load characteristics shown in Figure 2. The voltage supplied to auxiliary equipment that serves as a power source will also be significantly reduced. Therefore, the illuminance of lamps and the like decreases, and the functions of other auxiliary devices decrease, which may impede the operation of the vehicle.

On the other hand, if the generated output of the rotating electric machine driven by the turbine torque is supplied to the battery when the engine is under light load, the high voltage will be large! Due to this, the terminal voltage of the battery increases, and the voltage supplied to the auxiliary equipment connected to the same line also increases, resulting in a disadvantage that the life of the auxiliary equipment is shortened due to the excessive voltage.

The present invention was made in view of such problems,
The purpose is to provide a battery device for a vehicle equipped with a turbocharger with a rotating electrical machine that does not adversely affect on-vehicle auxiliary equipment even when the rotating electrical machine is in operation.

(Means for Solving the Problems) According to the present invention, in a battery device for a vehicle having a turbocharger system that selectively operates a rotating electric machine provided on a rotating shaft of a turbocharger between a power generation state and an electric power state, A battery device for a vehicle is provided which is exclusively provided with a power storage means that stores power generated during a power generation state and supplies the stored power to a rotating electrical machine during an electric power state.

(Function) In the present invention, the rotating electrical machine is provided with a dedicated battery and a battery frequently used for auxiliary equipment, and these batteries are disconnected or connected in series depending on the operating state of the rotating electrical machine.
During normal electric/power generation operation, the batteries are disconnected and auxiliary equipment is not affected, but when the rotating electric machine is driven at high speed, the batteries are connected in series, so a high voltage is supplied.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a turbocharger, which is equipped with a turbine 11 that is rotationally driven by the exhaust gas energy of an engine (not shown), and a compressor 12 that supercharges and pressure-feeds air to the engine. A rotating electric machine 2 serving as an electric generator is attached to a rotating shaft connecting the rotating electric machine 12.

Reference numeral 3 denotes a battery, which supplies power to the rotating electric machine 2 to operate the electric motor when the engine is running at low speeds and under high load, and serves as a power source to assist the supercharging operation of the compressor 12.
On the other hand, when the engine is under light load, the exhaust energy is converted into electric power by the power generation operation of the rotating electrical machine 2, and the battery 3 is charged with the recovered electric power.

4 is a power converter, in which an inverter and a converter are connected in parallel to perform bidirectional conversion; when DC is supplied from battery 3, the inverter operates and outputs AC at a predetermined frequency. , the AC power boosted through the transformer 5 is supplied to the rotating electric machine 2. On the other hand, when AC power from the rotating electric machine 2 in power generation operation is transmitted to the power converter 4 via the transformer 5, the converter operates to output DC and charge the battery 3.

A battery 6 is provided separately from the battery 3, and serves as a power source for the auxiliary equipment 7. The battery 3 and the battery 6 can be connected in series by a switching relay 8, which will be described later. be. Note that 61 is a normal generator driven by engine torque, and is used exclusively to charge the battery 6.

The switching relay 8 is a relay having a switch circuit that switches two circuits in both directions, and when switched in the direction of the arrow ■, the A contact is turned off, and the B contact connects the child circuit of the battery 3 to the input circuit of the power converter 4. Arrow again! ■When you change the force direction,
The A contact is connected to one circuit of the battery 6, and the B contact is connected to a child circuit of the battery 6, so that the batteries 3 and 6 are connected in series, and the power converter 4 receives twice the normal voltage. is configured to be applied.

FIG. 3 is a processing flow diagram showing an example of the operation of this embodiment.
Next, the processing will be explained using FIG.

In step 1, the switching relay 8 is operated in one direction, the A contact is turned off, and the B contact is connected in the right direction, thereby connecting one circuit of the battery 3 to the input circuit of the power converter 4.

In step 2, it is determined whether or not to electrically operate the rotating electric machine 2 depending on the operating state of the engine, and when not operating it as an electric motor, normal turbocharger control
However, when operating as an electric motor, proceed to step 3.

Here, it is determined whether or not to increase the rotation speed of the turbocharger's rotating shaft above normal.If the turbocharger is driven by the electric motor normally, the process will proceed to Q, and if the rotation speed is to be particularly increased, the process will proceed to step 4. Then, the switching relay 8 is inserted in the +1 direction, the battery 3 and the battery 6 are connected in series, and a high voltage is supplied to the rotating electric machine 2 via the power converter 4 and the transformer 5 to drive it (step 5 ).

Next, in step 6, it is checked whether to turn off or continue the motor operation in step 5. If the motor is to be turned off, the process proceeds to step 7 and the operation is cut off. On the other hand, if the operation is to be continued, the process returns to step 5. The electric operation of the rotating electrical machine will continue.

Although the present invention has been described above 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.

(Effects of the Invention) According to the present invention, a battery frequently used for auxiliary equipment is provided separately from the conventional battery, and a switching means for connecting the two batteries in series is provided. Since the batteries are separated from each other, the negative effects of voltage changes caused by the operation of the rotating electric machine on the auxiliary equipment can be avoided, and when the rotating electric machine is operated at high speeds, by connecting two batteries in series, high voltage can be avoided. It can be supplied to rotating electric machines and has the effect of strongly supporting the supercharging operation of turbochargers.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing one embodiment of the present invention, FIG. 2 is a battery load characteristic diagram, and FIG. 3 is a processing flow diagram showing an example of the operation of this embodiment. 1...turbocharger, 2...rotating electric machine, 3...
・Battery, 6...Battery, 7...Auxiliary equipment, 8.
...Switching - Patent applicant: Isu-X Jidosha Co., Ltd. Patent attorney: Minoru Tsuji No. 1
Figure 2 Battery return to step 1

Claims (2)

[Claims] (1) In a battery device for a vehicle having a turbocharger system that selectively operates a rotating electric machine provided on the rotating shaft of the turbocharger between a power generation state and an electric state,
A battery device for a vehicle, characterized in that a battery device for a vehicle is provided exclusively with power storage means for storing power generated during the power generation state and supplying the stored power to the rotating electrical machine during the electric power state. (2) In a battery device for a vehicle having a turbocharger system that selectively operates a rotating electrical machine provided on the rotating shaft of the turbocharger between a power generation state and an electric state,
Dedicated power storage means is provided to store the power generated during the power generation state and supply the stored power to the rotating electric machine during the motorized state, and the power storage means is connected in series with a separate power storage means during the motorized operation. What is claimed is: 1. A battery device for a vehicle, comprising means for supplying power to a rotating electrical machine.