JP3044962B2 - Motor control device for electric vehicle with engine-driven generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device for an electric vehicle with an engine driven generator having an engine driven generator for supplying charging power to a battery.

[0002]

2. Description of the Related Art In recent years, electric vehicles have attracted attention from the viewpoint of preventing pollution. However, an electric vehicle is equipped with a battery as an energy source. Even if the battery has a considerably large volume and a large weight, the distance that can be traveled with the electric capacity is not so large. So, to extend the mileage per charge, equipped with an engine-driven generator,
2. Description of the Related Art An electric vehicle with an engine-driven generator that charges a battery with generated electric power is known.

[0003] In this electric vehicle with an engine-driven generator, exhaust gas is generated when the engine is driven. For this reason, the engine-driven generator is operated only when the state of charge of the battery is deteriorated, and the driving of the engine is minimized. Therefore, it is possible to extend the mileage per charge without increasing the number of batteries while maintaining low pollution. Such an electric vehicle with an engine-driven generator is disclosed in, for example, JP-A-55-157901.

[0004]

Here, in the above-described conventional electric vehicle with an engine-driven generator, it is assumed that the engine-driven generator operates normally and power is supplied from the engine-driven generator. . Therefore, even when the state of charge of the battery is deteriorated, the output of the motor is controlled in the same manner as in the normal state.

[0005] However, it cannot be said that the engine-driven generator never fails. Therefore, there are cases where the engine does not operate, the generator breaks down, the power cannot be generated, or even if the power can be generated, the amount of generated power does not reach the predetermined amount.

The operation of the engine-driven generator means that the state of charge of the battery has deteriorated. If the normal motor drive is continued in this state, the state of charge of the battery will be reduced. Worsens, and it becomes impossible to drive. In addition, when the battery is discharged until running becomes impossible, there is a possibility that the battery may be damaged due to overdischarge, and there is a problem that the capacity and life of the battery are reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an electric vehicle with an engine-driven generator capable of preventing sudden overdischarge of a battery when the engine-driven generator does not operate. It is an object of the present invention to obtain a motor control device.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a motor for driving an electric vehicle, a rechargeable battery for driving the motor, and an engine-driven generator for supplying power to the battery. A motor control device for an electric vehicle with an engine-driven generator, comprising: a charge state detection means for detecting a charge state of a battery ; and an engine when a charge state value of the battery detected by the charge state detection means is less than a predetermined value. the operation of the drive generator and engine generator control means outputs an operation signal that directive, a generator operation detecting means for detecting an operation of the engine generator, actuation signal and generating from the engine generator controlling means If it is determined from the detection result of the engine operation detecting means that the engine-driven generator does not operate despite the output of the operation signal, the output of the motor is limited. A motor output limiting means that, characterized by comprising a.

[0009]

According to the motor control device for an electric vehicle with an engine-driven generator according to the present invention, the state of charge of the battery is set to a predetermined value according to the state of charge of the battery detected by the state of charge detection means for detecting the state of charge of the battery. If less than, the engine drive generator control means outputs a signal for operating the engine drive generator, activates the engine drive generator, and charges the battery.

The state of charge of the battery is less than a predetermined value.
In this case, when the engine drive generator is not operated even though the signal for operating the engine drive generator is output, the output of the motor can be limited by the motor output limiting means. Therefore, when the engine-driven generator does not operate, the output of the motor can be reduced, thereby preventing sudden overdischarge of the battery, reducing damage to the battery, and extending the life.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an engine 1 is a prime mover for generating power, and after increasing a rotation speed via a speed increaser 2, drives an electric generator 3 to generate electric power. Since the generated power is AC, the power is rectified by the rectifier 4 and converted into DC, and then supplied to the inverter 5 and the battery 6. The motor 7 is an AC induction motor, and is driven by predetermined AC power supplied via the inverter 5. The torque of the motor 7 drives the tire 9 via the speed reducer 8. The SOC meter 10 is a state-of-charge detecting means for detecting the state of charge of the battery, and an ECU (electronic control unit) 11 performs various processes. The SOC meter 10 counts the amount of charge / discharge of the battery 6 (integrates the amount of discharge current), grasps the state of charge of the battery 6, and provides the information to the ECU 11. The ECU 11 controls the inverter 5 with an accelerator signal and a brake signal from the driver as inputs, controls the output of the motor, and controls the SOC meter 1.
It functions as an engine-driven generator control unit that starts and stops the generator 3 based on the charge state value signal of 0. That is, the operation / stop signal is sent to the engine power generation unit controller 12. The voltmeter 13 measures a voltage between terminals of the battery 6 and supplies a detected value to the ECU 11. The ECU 11 uses the detected voltage of the voltmeter 13
An abnormality of the generator 3 is detected.

FIG. 2 is a flowchart showing an operation / stop control operation of the engine power generation unit controller 12 of the motor control device of the electric vehicle with an engine driven generator. First, the SOC (Sta) is measured by the SOC meter 10.
te Of Charge: state of charge) is detected (S
101), the detected SOC is a predetermined value A (for example, 30 to
It is determined whether it is greater than (arbitrary value of about 60%) (S102). NO in S102, that is, SOC
Is less than the predetermined value, the battery 6 needs to be charged, so that the power generation by the generator 3 is started. Then, the engine power generation unit controller 12 starts driving the engine 1, supplies a predetermined field current to the generator 3, and starts power generation (S103). In the case of YES in S102, the battery is in a sufficiently charged state, so that power generation is not performed.
Returning to step 101, the SOC detection is executed again.

After power generation is started in S103, S
The process proceeds to 104, and it is determined whether or not the operation is normal (S10).
4). In this determination, the voltage between the terminals of the battery 6 is measured by, for example, the voltmeter 13, and when the voltage becomes equal to or more than a predetermined value, it is determined that the operation is normal. If the determination in S104 is YES, then the process proceeds to S
It is determined whether or not OC is larger than B (for example, an arbitrary value of 50 to 80% and larger than A by a predetermined value or more) (S
105). In the case of YES in S105, since the battery is in a sufficiently charged state, the power generation is stopped (S106). On the other hand, in the case of NO in S105, the state of charge of the battery 6 has not been sufficiently recovered, so that power generation is continued.
Returning to step 04, the determination of whether or not the normal operation is performed is repeated.

In the case of NO in S104, that is, even though the operation signal is transmitted from the ECU 11 to the engine power generation unit controller 12, the fuel system and ignition of the engine power generation unit controller 12, the generator 3, or the engine 1 are generated. When the engine 1 stops operating due to a system failure or the generator 3 does not generate power or does not have a predetermined output, the motor output limiting means provided in the ECU 11 limits the motor output. The output limit at this time is set to about 1/3 to 1/2 of the original maximum output, depending on how the SOC is reduced. This output limitation is performed by controlling the drive of the inverter 5, for example, by reducing the torque command value itself input to the ECU 11 to 自 体 to 、 and controlling the drive of the inverter 5. As a result, the amount of current supplied to the motor 7 is limited, and rapid discharge of the battery can be prevented. In order to notify the driver of such an abnormality of the engine driven generator, an alarm buzzer or a warning display may be performed. Further, an automatic inspection means for the engine-driven generator is provided so as to detect any abnormality of the engine 1, the gearbox 2, the generator 3, and the rectifier 4, and to automatically detect and display the cause thereof. It may be. Further, in the case of an engine start error, a retry may be prompted or an automatic retry may be performed.

As described above, according to this embodiment, when the state of charge of the battery 6 is reduced and the signal for operating the engine-driven generator is output, but the generator 3 does not operate normally. The output of the motor 7 is limited by the motor output limiting means provided in the ECU 11, thereby preventing a sudden overdischarge of the battery 6, reducing damage to the battery and extending its life.

[0017]

As described above, in the motor control device for an electric vehicle with an engine-driven generator according to the present invention, the engine-driven generator does not operate even though a signal for operating the engine-driven generator is output. At this time, the output of the motor is limited by the motor output limiting means. Thus, when the engine-driven generator does not operate, the motor can be driven at a high output to prevent the battery from being rapidly discharged. Therefore, overdischarge of the battery can be prevented, damage to the battery can be reduced, and the life can be prolonged.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a control operation according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 engine 2 gearbox 3 generator 4 rectifier 5 inverter 6 battery 7 motor 8 reduction gear 9 tire 10 SOC meter 11 ECU 12 engine generator unit controller 13 voltmeter

Claims (1)

(57) [Claims] A motor for driving an electric vehicle;
What is claimed is: 1. A motor control device for an electric vehicle with an engine-driven generator, comprising: a rechargeable battery for driving the motor; and an engine-driven generator for supplying power to the battery. State detection means, and when the state of charge of the battery detected by the state of charge detection means is less than a predetermined value, instructs operation of the engine-driven generator.
An engine driven generator control means outputs an operation signal that decree, a generator operation detecting means for detecting an operation of the engine generator, the detection result of the actuation signal and the generator operation detecting means from the engine generator controlling means A motor output limiting means for limiting the output of the motor when it is determined that the engine-driven generator does not operate despite the output of the operation signal. Motor control device for electric vehicles