JPH06289108A - Measuring device for remaining capacity of battery for electric automobile - Google Patents

Abstract

PURPOSE:To measure the remaining capacity of a motor driving battery consisting of a plurality of batteries in a short time without using a battery checker. CONSTITUTION:A battery 18 and a resister 40 formed of a load resistance 17 are mutually connected through a connecting circuit having a voltmeter 41 and an ammeter 43, and a switch 44 is connected in series with the ammeter 43, and a voltage and a current at a time when the switch 44 is closed and a normal state is therefore attained are severally measured by the voltmeter 42 and the ammeter 43 for measuring the remaining capacity of the battery 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery residual capacity measuring device for an electric vehicle, and more particularly to a measuring device for measuring a battery residual capacity for supplying power to a motor.

[0002]

2. Description of the Related Art An internal combustion engine which takes out output by utilizing pressure generated by burning fossil fuel in a cylinder is
Exhaust gas contains toxic substances and causes air pollution.
On the other hand, the electric vehicle does not generate exhaust gas because it drives the motor by the power supplied from the battery to drive the vehicle. Therefore, air pollution due to exhaust gas can be reliably prevented. Also, since the drive wheels are driven by the motor,
It is low in noise and is particularly suitable as an automobile in urban areas.

[0003]

In a vehicle driven by an internal combustion engine, the remaining amount of fuel in the fuel tank is displayed on the instrument panel with a fuel gauge. On the other hand, in the case of an electric vehicle, it is necessary to measure the remaining capacity of the battery and display it on the instrument panel. That is, it is necessary to measure the remaining capacity of the battery.

Generally, in a battery of an automobile, a plurality of storage batteries are connected to each other and used, and the remaining capacity of each storage battery is measured using a battery checker. According to such a measurement, not only is the measurement troublesome, but there is also a disadvantage that it takes time.

The present invention has been made in view of the above problems, and provides a battery remaining capacity measuring device for an electric vehicle capable of quickly and easily measuring the remaining capacity of the battery. The purpose is.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a motor for driving drive wheels, a battery for supplying power to the motor, and a load resistor that consumes power generation output when the motor is used as a generator. A resistor and a connection circuit that includes a switch, and that connects the battery and the resistor, and an ammeter and a voltmeter that are provided in the connection circuit and that measure the remaining capacity of the battery, The present invention relates to an apparatus for measuring the remaining capacity of a battery of an electric vehicle, which includes

[0007]

By closing the switch of the connection circuit for connecting the battery and the resistor, the power source of the battery flows to the load resistance, and the voltage between the terminals of the battery and the current flowing from the battery to the load resistance are respectively connected to the voltmeter. Since it is measured by the ammeter, the remaining capacity of the battery composed of a plurality of storage batteries can be measured at one time.

[0008]

1 shows an engine 10 having a motor according to an embodiment of the present invention.
Consists of diesel engines for route buses. A flywheel housing 12 is provided between the engine 10 and the transmission 11, and a flywheel 13 is rotatably housed in the flywheel housing 12. The flywheel 13 constitutes a rotor of the motor, and a stator 14 is provided inside the housing 12 so as to face the outer peripheral portion of the rotor. That is, the rotor 13 and the stator 14 constitute an induction motor 15 that also serves as an induction generator, and the motor 15 assists the engine 10.

The stator coil 14 of the motor 15 is connected to the inverter 16. A load resistor 17 and a battery 18 are connected to the inverter 16. The vehicle load 19 is connected in parallel to the battery 18.
Are connected. The inverter 16 is controlled by the controller 20 in terms of phase and current. A rotation detection sensor 21 and a rack position sensor 22 that detect the rotation speed of the engine 10 are connected to the input side of the controller 20. The rack position sensor 22 detects the position of the control rack 24 of the fuel injection pump 23 of the engine 10.

FIG. 2 is a developed view of the rotor 13 and the stator 14 of the motor 15, in which an inductor 26 is provided on the outer peripheral side of the flywheel 13. On the other hand, the stator yoke 14 is provided on the flywheel housing 12 side, and the stator yoke 1
4, poles 27 are formed at predetermined intervals. Moreover, four-phase stator coils 31 to 34 are wound around the pole 27, respectively.

In the four-phase coils 31 to 34, when the inductor 26 and the pole core 27 around which the a-phase coil 31 is wound coincide with each other, the pole 27 around which the c-phase coil 33 is wound is closer to the pole 26 than the inductor 26. Is delayed by 90 degrees in electrical angle. The pole 27 around which the b-phase coil 32 is wound is delayed 180 degrees in electrical angle with respect to the inductor 26. The pole 27 around which the d-phase coil 34 is wound is delayed from the inductor 26 by an electrical angle of 270 °.

That is, the pole 27 of the stator 14 and the inductor 26 of the rotor 13 are displaced in pitch.
The rotor 26 has a structure in which the inductor 26 of the rotor 13 is not set to a multiple, but is shifted depending on the phase, and a rotating magnetic field is created by switching the coils 31 to 34 and used as a motor.
Alternatively, it also generates electricity.

Next, the operation of the induction motor 15 which also serves as a generator will be described. The operation when braking is performed by using the motor 15 as a generator will be described first. In FIG. 2, the phase a has the smallest gap and the smallest reluctance. Further, the reluctance of the b phase has the maximum value. The values of the c phase and the d phase are intermediate values between them. In this way, the reluctance of the coils 31 to 34 of each phase changes according to the rotation of the rotor 13.

When the d-phase coil 34 is excited in FIG. 2, the inductor 26 of the rotor 13 is pulled by the magnetic force in the direction opposite to the rotating direction. Therefore, in this case, the rotor 13 receives the braking force by the stator 14, and the braking mode is set. Therefore, each phase coil 3
A power generation output is induced in 1 to 34, and a torque applied from the outside is absorbed by this generator, braking is performed, and a function as a retarder is generated. The power generation output at this time is used to charge the battery 18, and the surplus power is consumed by the load resistor 17. Alternatively, the power generation output is used to drive the vehicle load 19.

Next, the engine 10 is driven by the motor 15.
2 is excited, the c-phase coil 33 in FIG. 2 is excited. Then, the inductor 26 of the rotor 13 is pulled in the rotating direction by the magnetic force. Therefore, in this case, the rotor 32 is rotationally driven by the coil 32. That is, by exciting the a-phase to d-phase coils 31 to 34 so that the reluctance gradually decreases, this motor generates torque and assists the output of the engine 10.

The controller 20 reads the rotation speed of the engine 10 and the position of the control rack 24 of the fuel injection pump 23 by sensors 21 and 22, respectively. In the positive torque region shown in FIG. 3, the controller 20 controls the timing of the current flowing from the battery 18 to the stator coils 31 to 34 via the inverter 16 to activate the motor 15 and assist the engine 10. It will be. Therefore, in the vicinity of the engine 10 generating the maximum torque, the assist by the motor 15 is performed, and the hybrid engine is established at this time.

When the engine 10 is assisted by exceeding a predetermined load, the engine 10 is further operated.
Therefore, the fuel consumption of the engine 10 is suppressed to a certain value or less because the load of No. The smoke, nitrogen oxides, nitric oxide, and hydrocarbons in the exhaust gas are also assisted by the motor 15, so that they are significantly reduced as compared with the case where the vehicle is driven only by the engine 10. As shown in FIG. 3, this vehicle uses the motor 15 as a generator to charge the battery 18 when the position of the control rack 24 is on the low load side. The electric power supplied is used to assist the engine 10 with the motor 15 at the time of starting or accelerating.

As described above, the diesel engine 10 for a route bus according to this embodiment is a motor 1 that also serves as an induction generator.
5 is equipped, and the current is passed from the battery 18 to the coils 31 to 34 of the motor 15 at the time of high load to drive,
The engine 10 is designed to run without being used in the full load range. Therefore, the exhaust power of nitrogen oxides and carbon monoxide in the exhaust gas of the engine 10 is reduced, and moreover, fuel efficiency is improved by regenerating the energy during vehicle deceleration and charging the battery 18.

Further, since the engine 10 does not use the full load area as shown in FIG. 4, noise can be reduced, and it is suitable as a route bus for urban areas. When the energy balance is not achieved by only charging the battery during deceleration, the motor 15 is used as a generator and the battery 18 is charged when the vehicle is stopped at light load or idling as shown in FIG. Good.
Further, in the case of a vehicle that does not operate at night, it is possible to use charging of the battery 18 from a commercial power source together.

Next, a measuring device for measuring the remaining capacity of the battery 18 for driving the motor 15 which also serves as the generator will be described. As shown in FIG. 5, the battery 18 is adapted to be connected to a resistor 40 having a load resistance 17, and a terminal 41 of the resistor 40 is connected via a connection circuit having a voltmeter 42 and an ammeter 43. Battery 18
It is designed to be connected with. Voltmeter 42 is terminal 41
While the ammeter 43 is connected to both ends of the battery 18, the ammeter 43 is connected to one terminal and the positive terminal of the battery 18. Further, a knife switch 44 is connected in series with the ammeter 43.

By connecting the connection circuit composed of the voltmeter 42 and the ammeter 43 between the battery 18 and the resistor 40 having the load resistance 17, the battery 18 is connected.
It is possible to measure the remaining capacity of. That is, when the knife switch 44 is turned on and the transient state has passed and the steady state is reached, the voltage is measured by the voltmeter 42 and the ammeter 4
By measuring the current according to 3, it becomes possible to measure the remaining capacity of the battery 18 composed of a plurality of storage batteries at one time.

According to such a measurement, the remaining capacity of the battery 18 can be instantaneously measured, and the time for measuring the remaining capacity of the battery 18 can be significantly shortened as compared with the conventional case. become. Since the resistor 40 including the load resistor 17 has a large resistance value, the current flowing from the battery 18 to the load resistor 17 is very small, and the battery 18 is not discharged during the measurement.

[0023]

As described above, according to the present invention, the switch provided in the connection circuit is closed to allow a current to flow from the battery to the load resistance, and the current value and the voltage value at that time are respectively indicated by an ammeter and a voltmeter. It is designed to be measured by and. Therefore, it becomes possible to simply and easily measure the remaining capacity of the battery including a plurality of storage batteries.

[Brief description of drawings]

FIG. 1 is a block diagram of a hybrid engine including a combination of an internal combustion engine and a motor.

FIG. 2 is a developed front view of a main part of a motor attached to an engine.

FIG. 3 is a graph showing a positive torque region.

FIG. 4 is a graph showing a relationship between an output torque of an engine and a positive torque region of a motor.

FIG. 5 is a circuit diagram of a device for measuring the remaining capacity of a battery.

FIG. 6 is a block diagram of a voltage display device.

[Explanation of symbols]

 10 engine 11 transmission 12 flywheel housing 13 flywheel (rotor) 14 stator 15 induction motor / generator 16 inverter 17 load resistance 18 battery 19 vehicle load 20 controller 21 rotation detection sensor 22 rack position sensor 23 fuel injection pump 24 control rack 26 Inductor 27 Pole 31 Stator coil (a phase) 32 Stator coil (b phase) 33 Stator coil (c phase) 34 Stator coil (d phase) 40 Resistor 41 Terminal 42 Voltmeter 43 Ammeter 44 Knife switch

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[Procedure amendment]

[Submission date] October 15, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a block diagram of a hybrid engine including a combination of an internal combustion engine and a motor.

FIG. 2 is a developed front view of a main part of a motor attached to an engine.

FIG. 3 is a graph showing a positive torque region.

FIG. 4 is a graph showing a relationship between an output torque of an engine and a positive torque region of a motor.

FIG. 5 is a circuit diagram of a device for measuring the remaining capacity of a battery.

[Explanation of Codes] 10 Engine 11 Transmission 12 Flywheel Housing 13 Flywheel (Rotor) 14 Stator 15 Induction Motor and Generator 16 Inverter 17 Load Resistance 18 Battery 19 Vehicle Load 20 Controller 21 Rotation Detection Sensor 22 Rack Position Sensor 23 Fuel Injection Pump 24 Control rack 26 Inductor 27 Pole 31 Stator coil (a phase) 32 Stator coil (b phase) 33 Stator coil (c phase) 34 Stator coil (d phase) 40 Resistor 41 Terminal 42 Voltmeter 43 Ammeter 44 Knife switch

Claims (1)

[Claims] 1. A motor for driving a drive wheel, a battery for supplying power to the motor, a resistor composed of a load resistor that consumes power generation output when the motor is used as a generator, and a switch. And a connection circuit for connecting the battery and the resistor, and an electric vehicle battery provided with the connection circuit, and an ammeter and a voltmeter for measuring the remaining capacity of the battery, respectively. Remaining capacity measuring device.