KR20020044297A - Auxiliary battery deep discharging protection system for electric vehicle - Google Patents
Auxiliary battery deep discharging protection system for electric vehicle Download PDFInfo
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- KR20020044297A KR20020044297A KR1020000073323A KR20000073323A KR20020044297A KR 20020044297 A KR20020044297 A KR 20020044297A KR 1020000073323 A KR1020000073323 A KR 1020000073323A KR 20000073323 A KR20000073323 A KR 20000073323A KR 20020044297 A KR20020044297 A KR 20020044297A
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- power
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- converter
- charge level
- auxiliary battery
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- 238000007599 discharging Methods 0.000 title description 2
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
Abstract
Description
본 발명은 전기 자동차에서 사용하는 축전지에 관한 것으로, 특히 제어장치, 릴레이 구동등 일반적으로 자동차에서 사용하는 12V 보조전원인 보조축전지의 과방전 방지장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery for use in an electric vehicle, and more particularly, to an overdischarge prevention device for an auxiliary storage battery, which is a 12V auxiliary power source generally used in automobiles such as a control device and a relay drive.
일반적으로 가솔린이나 경유등의 화석연료를 사용하는 내연기관 자동차에서는 시동시에 12V 또는 24V 축전지를 사용하여 엔진축과 연결되어 있는 시동전동기의 회전에너지를 사용하여 엔진을 시동시키고 엔진이 작동하면 엔진과 연결된 발전기를 이용하여 회전에너지를 전기에너지로 변환, 축전지에 저장하여 자동차엔진 제어장치, 릴레이 구동, 전조등과 같은 각종 전등의 전원으로 사용한다.In general, internal combustion engine cars using fossil fuels such as gasoline or diesel use 12V or 24V storage batteries to start the engine using the rotational energy of the starter motor connected to the engine shaft. It converts rotational energy into electric energy using a connected generator and stores it in a battery to be used as a power source for various lights such as automobile engine control devices, relay drives, and headlights.
전기 자동차에서도 일반적인 자동차에 사용되는 전원이 필요하므로 12V 보조축전지를 사용하고 자동차가 동작중에는 주 축전지의 전원을 컨버터를 이용하여 보조축전지에 충전하고 차량의 구동전원외의 전원에 사용한다.Electric vehicles require power for general vehicles, so 12V auxiliary batteries are used. While the vehicle is in operation, the power of the main battery is charged to the auxiliary batteries using a converter and used for power sources other than the driving power of the vehicle.
그러나, 운전자가 자동차 주행중 가동한 전기장치, 즉 헤드라이트, 미등, 카오디오등을 오프하지 않고 장시간 정차 및 주차를 시켰을 때, 전기 장치는 지속적으로 가동되어 차량의 전지가 완전방전 상태에 이르게 된다.However, when the driver stops and parks the vehicle for a long time without turning off the electric devices that are operated while driving the vehicle, that is, the headlights, taillights, car audio, and the like, the electric devices are continuously operated so that the battery of the vehicle is in a full discharge state.
즉, 운전자의 부주의로 자동차의 축전지가 완전방전 되면, 차량의 재시동이 불가능하고, 한번 내지 두 번 까지는 축전지 내부에서 자체적으로 충전이 되지만, 여러번 방전이 되면 축전지로서의 기능이 완전히 상실되어 차량의 재시동이 불가능하고, 축전지를 교체할 수 밖에 없는 상황이 된다.In other words, if the battery of the car is completely discharged due to the driver's carelessness, the vehicle cannot be restarted, and once or twice the battery is charged by itself, but if it is discharged several times, the battery function is completely lost and the vehicle restarts. It is impossible and there is no choice but to replace the battery.
이에 본 발명에서는 전기 자동차에서 보조축전지의 충전레벨을 감시하는 수단을 구비하여, 보조축전지의 과방전전에 제어기를 구동, DC/DC 컨버터를 이용하여 주축전지의 전원으로 보조축전지를 충전하여 과방전으로 인한 운행차질을 해결하고, 보조축전지의 수명을 연장할 수 있게 한다.Therefore, the present invention includes a means for monitoring the charge level of the secondary battery in the electric vehicle, driving the controller before the over-discharge of the secondary battery, by charging the secondary battery with the power of the main battery using a DC / DC converter to over discharge It solves the driving obstacles caused and extends the life of the auxiliary battery.
도 1은 본 발명의 구성을 보인 블록도.1 is a block diagram showing the configuration of the present invention.
도 2는 본 발명의 동작수순을 나타낸 플로우 챠트.2 is a flow chart showing an operation procedure of the present invention.
본 발명의 전기자동차의 보조축전지 과방전 방지장치는,The secondary battery over-discharge prevention device of the electric vehicle of the present invention,
주 콘택트부와 DC/DC 콘버터의 온/오프 동작을 제어하고, 상기 DC/DC 콘버터에 입력되는 충전전원의 전압과 전류를 측정하여 충전레벨을 산출, 보조 축전지의 완충시 스스로 전원을 차단하는 제어기와, 상기 주 축전지의 DC전원을 AC전원으로 변환, 구동모터에 공급하는 인버터와, 주 축전지의 고압의 DC전원을 저압의 DC전원으로 변환, 보조 축전지에 충전전원을 공급하는 DC/DC 콘버터와, 보조 축전지의 충전레벨을 감시하여 설정된 충전레벨 이하로 방전되었을시, 제어기에 동작 신호를 출력하는 충전레벨 감시수단과, 제어기의 온/오프 신호에 의해 온/오프 스위칭 동작하는 주 콘택트부를 구성하여, 상기 보조축전지의 충전레벨이 설정된 충전레벨 이하로 방전되었을시, 주 축전지의 전원으로 보조축전지를 충전하게 함을 특징으로 한다.A controller that controls the on / off operation of the main contact unit and the DC / DC converter, calculates the charge level by measuring the voltage and current of the charging power input to the DC / DC converter, and cuts off the power by itself when the auxiliary battery is fully charged. And an inverter for converting the DC power of the main battery into an AC power source and supplying the driving motor, a DC / DC converter for converting the high voltage DC power of the main battery into a low voltage DC power source and supplying charging power to the auxiliary battery. Charge level monitoring means for monitoring the charge level of the auxiliary battery and discharging it below the set charge level, and outputting an operation signal to the controller, and a main contact part for switching on / off by the on / off signal of the controller. When the charging level of the secondary battery is discharged below the set charging level, the auxiliary battery may be charged with the power of the main battery.
상기와 같은 특징을 갖는 본 발명의 구성 및 동작을 첨부된 도면을 참조하여 설명하면 다음과 같다.Referring to the configuration and operation of the present invention having the features as described above with reference to the accompanying drawings as follows.
도 1은 본 발명의 구성을 나타낸 블록도이고, 도 2는 본 발명의 실행수순을 나타낸 플로우 챠트이다.1 is a block diagram showing the configuration of the present invention, Figure 2 is a flow chart showing the execution procedure of the present invention.
전기 자동차의 구동모터(6)의 전원을 공급하며, 보조 축전지(7)의 과방전시 보조 축전지(7)에 충전전원을 공급하는 주 축전지(1)와,A main storage battery 1 for supplying power to the driving motor 6 of the electric vehicle and supplying charging power to the auxiliary storage battery 7 when the secondary storage battery 7 is over discharged;
제어기(4)의 온/오프 신호에 의해 온/오프 스위칭 동작하는 주 콘택트부(2)와,A main contact portion 2 which performs on / off switching operation by an on / off signal of the controller 4,
상기 주 축전지(1)에서 공급하는 DC전원을 AC전원으로 변환하여 구동모터(6)에 공급하는 인버터(3-1)와, 주 축전지(1)에서 공급하는 고압의 DC전원을 저압의 DC전원으로 변환하여 보조 축전지(7)에 충전전원을 공급하는 DC/DC 콘버터(3-2)로 구성된 변환부(3)와,The inverter 3-1 converts the DC power supplied from the main battery 1 into AC power and supplies the driving motor 6 with the high voltage DC power supplied from the main battery 1 to the low voltage DC power. A conversion unit 3 composed of a DC / DC converter 3-2 for supplying charging power to the auxiliary storage battery 7 by converting to
보조 축전지(7)의 충전레벨을 감시하여 설정된 충전레벨 이하로 방전되었을시, 제어기(5)에 동작 신호를 출력하는 충전레벨 감시수단(4)과,A charge level monitoring means (4) for monitoring the charge level of the auxiliary storage battery (7) and outputting an operation signal to the controller (5) when discharged below the set charge level;
상기 충전레벨 감시수단(4)의 신호를 공급받아 온동작하여 주 콘택트부(2)와DC/DC 콘버터(3-2)의 온/오프 동작을 제어하고, 상기 DC/DC 콘버터(3-2)에 입력되는 충전 전원의 전압과 전류를 측정하여 충전레벨을 산출, 보조 축전지(7)의 완충시 스스로 전원을 차단하는 제어기(5)와,The on / off operation of the main contact unit 2 and the DC / DC converter 3-2 is controlled by being turned on by receiving the signal of the charge level monitoring means 4, and the DC / DC converter 3-2. A controller 5 which measures the voltage and current of the charging power input to the power supply to calculate the charging level, and cuts off the power by itself when the auxiliary battery 7 is fully charged;
상기 인버터(3-1)에서 출력하는 AC전원을 공급받아 구동되어 전기자동차의 견인력을 발생하는 구동모터(6)와,A drive motor 6 driven by receiving AC power output from the inverter 3-1 to generate traction of an electric vehicle, and
자동차의 엔진제어장치, 전조등, 와이퍼, 시동모터등 소전력을 소모하는 전기장치의 전원을 공급하는 보조 축전지(7)로 구성된다.It consists of an auxiliary storage battery (7) for supplying power for electric devices that consume small power, such as engine control devices, headlights, wipers, starting motors of automobiles.
상기와 같은 구성을 갖는 본 발명의 동작을 설명하면 다음과 같다.Referring to the operation of the present invention having the configuration as described above are as follows.
본 발명의 전기자동차의 보조축전지 과방전 방지장치는The secondary battery over-discharge prevention device of the electric vehicle of the present invention
보조 충전지의 충전레벨 감시수단을 구비하여 보조축전지의 충전레벨이 설정된 충전레벨 이상 방전되었을시, 주 축전지의 전원으로 보조축전지를 충전하게 함을 특징으로 하는바,A charging level monitoring means of the auxiliary rechargeable battery is provided to charge the auxiliary battery with the power of the main battery when the charging level of the auxiliary battery is discharged above the set charging level.
본 발명은 자동차의 동작중이 아닐 때, 즉 장시간 정차시나 주차 상태시 동작을 설명하겠다.The present invention will be described when the vehicle is not in operation, i.e. during long stops or parking conditions.
일반적으로, 운전자나 동승자의 실수로 자동차 주행중 가동한 전기장치, 즉 헤드라이트, 미등, 카오디오등을 오프하지 않고 장시간 정차 및 주차를 시켰을 때, 전기 장치는 지속적으로 가동되어 상기 전기장치의 전원을 공급하는 보조 축전지(7)는 방전을 계속하게 된다.In general, when an electric device that is operated while driving a vehicle by a driver or passenger's mistake, that is, stops and parks for a long time without turning off headlights, taillights, car audio, and the like, the electric device is continuously operated to turn off the electric device. The auxiliary storage battery 7 to supply continues discharge.
충전레벨 감시수단(4)는 상시 보조 축전지(7)의 충전레벨을 감시하고 있는바, 설정된 충전레벨 이상 방전되었을시, 제어기(5)에 온 동작신호를 출력하게 된다.The charging level monitoring means 4 constantly monitors the charging level of the auxiliary storage battery 7. When the charging level is discharged more than the set charging level, the charging level monitoring means 4 outputs an on operation signal to the controller 5.
상기 충전레벨 감시수단(4)의 온 동작신호를 공급받은 제어기(5)는 주 콘택트부(2)와 DC/DC 콘버터(3-2)에 온동작 신호를 공급한다.The controller 5 receiving the ON operation signal of the charge level monitoring means 4 supplies the ON operation signal to the main contact unit 2 and the DC / DC converter 3-2.
상기 주 콘택트부(2)가 제어기(5)의 신호를 공급받아 온 스위칭 동작함으로써, 상기 주 축전지(1)의 전원을 DC/DC 콘버터(3-2)를 통해 보조 축전지(7)에 충전가능하게 된다.The main contact unit 2 is switched on to receive the signal from the controller 5, so that the power supply of the main battery 1 can be charged to the auxiliary battery 7 through the DC / DC converter 3-2. Done.
또한, 제어기(5)는 DC/DC 콘버터(3-2)에 흐르는 충전전원의 전압 및 전류를 측정하여 보조 축전지(7)에 충전되는 충전레벨을 산출한다.In addition, the controller 5 calculates the charge level charged in the auxiliary storage battery 7 by measuring the voltage and current of the charging power supply flowing in the DC / DC converter 3-2.
그럼으로써, 보조 축전지(7)가 완충하게 되면, 제어기(7)는 주 콘택트부(2) 및 DC/DC 콘버터(3-2)에 오프 신호를 출력하고, 자신의 제어 전원 또한 차단하여 동작을 멈춘다.Thus, when the auxiliary storage battery 7 is fully charged, the controller 7 outputs an off signal to the main contact portion 2 and the DC / DC converter 3-2, and also cuts off its own control power supply to perform the operation. Stop
본 발명의 상세 동작 설명을 도 2의 플로우 차트를 참조하여 설명하면 다음과 같다.Detailed operation of the present invention will be described with reference to the flowchart of FIG. 2 as follows.
충전레벨 감시수단이 보조 축전지의 충전레벨을 감시하여, 상기 충전레벨이 설정된 충전레벨 이하로 방전되는가를 판단하는 과정과,A step of charging level monitoring means for monitoring the charging level of the auxiliary storage battery to determine whether the charging level is discharged below the set charging level;
상기 과정에서 판단결과 설정된 충전레벨 이하로 방전되면 제어기에 동작신호를 출력하여 제어기를 온 시키는 과정과,When the discharge is below the set charging level as a result of the determination, turning on the controller by outputting an operation signal to the controller;
입력되는 동작신호의 종류를 제어기가 구분하여 과방전 신호이면 주 콘택트부 및 DC/DC 컨버터를 온동작 시켜, 보조 축전지를 충전시작하는 과정과,A process of starting charging of the auxiliary battery by turning on the main contact unit and the DC / DC converter when the controller distinguishes the type of the input operation signal and the over discharge signal;
상기 주 콘택트부와 DC/DC 콘버터가 온 동작함에 따라 DC/DC 콘버터에 흐르는 충전전원의 전압 및 전류를 측정하여 충전레벨을 산출, 완충 여부를 판단하는 과정과,Calculating the charging level by determining the voltage and current of the charging power flowing in the DC / DC converter as the main contact unit and the DC / DC converter are turned on;
상기 과정에서 판단결과 보조 축전지가 완충되었으면, 주 콘택트부와 DC/DC 컨버터에 오프 신호를 출력하고, 제어기의 전원을 오프시켜 종료하는 과정의 수순으로 이루어진다.In the above process, if the auxiliary storage battery is fully charged, the process of outputting an off signal to the main contact unit and the DC / DC converter, turning off the power of the controller, and ending the procedure.
본 발명은 보조 축전지의 충전레벨을 감시하여, 상기 충전레벨이 설정된 충전레벨 이하로 방전하면 주 축전지의 전원을 이용하여 보조 축전지를 충전함을 특징으로 하는바,The present invention is characterized by monitoring the charging level of the auxiliary battery, and charging the auxiliary battery using the power of the main battery when the charge level is discharged below the set charge level,
충전레벨 감시수단(4)은 보조 축전지(7)의 충전레벨을 상시 감시하여, 상기 충전레벨이 설정된 충전레벨 이하인가를 판단, 설정된 충전레벨 이하면 제어기(5)에 동작신호를 출력하여 온 동작시킨다.The charge level monitoring means 4 constantly monitors the charge level of the auxiliary storage battery 7, determines whether the charge level is less than or equal to the set charge level, and outputs an operation signal to the controller 5 when the charge level is less than or equal to the set charge level. Let's do it.
상기 제어기(5)는 입력된 동작신호의 종류를 구분하는데, 상기 동작신호의 종류에는 자동차의 키(Key)가 입력됨에 따라 발생하는 키입력 신호와, 상기 충전레벨 감시수단(4)에서 출력하는 과방전 신호, 주 축전지(1)를 충전하기 위한 충전장치의 온신호가 있다.The controller 5 classifies the type of the input operation signal. The type of the operation signal is a key input signal generated when a key of a vehicle is input, and the charge level monitoring means 4 outputs the key input signal. There is an over discharge signal and an on signal of a charging device for charging the main battery 1.
제어기(5)는 상기 입력된 동작신호의 종류를 구분하여, 입력된 신호가 과방전 신호이면 주 콘택트부(2)와 DC/DC 콘버터(3-2)를 온 동작시켜 상기 보조 축전지(7)를 충전하게 된다.The controller 5 classifies the type of the input operation signal, and if the input signal is an over discharge signal, turns on the main contact unit 2 and the DC / DC converter 3-2 to operate the auxiliary storage battery 7. Will charge.
이때, 충전레벨은 제어기(5)가 DC/DC 컨버터(3-2)에 흐르는 충전전원의 전압 및 전류를 측정하여, 완충가능한 충전레벨을 산출하게 된다.At this time, the charge level is calculated by the controller 5 to measure the voltage and current of the charging power flowing in the DC / DC converter (3-2), the buffer level chargeable.
그리고, 제어기(5)는 보조 축전지(7)의 완충여부를 판단하여 완충시에는 주 콘택트부(2)와, DC/DC 콘버터(3-2)를 오프동작 시키고, 제어기(5)자신도 전원을 차단하여 종료하게 된다.Then, the controller 5 determines whether or not the auxiliary battery 7 is fully charged, and when it is fully charged, the controller 5 turns off the main contact unit 2 and the DC / DC converter 3-2, and the controller 5 itself also supplies power. Will terminate by blocking.
상기에서 설명한 바와 같이 본 발명에서는 보조축전지의 충전레벨을 감시하여 과방전전에 제어기를 구동, DC/DC 컨버터를 이용하여 주축전지의 전원으로 보조축전지를 충전함으로써, 보조축전지의 과방전을 미연에 방지할 수 있어, 전기 자동차의 안정적인 운행뿐만 아니라 축전지의 수명을 연장하여 전기자동차의 유지보수 비용을 절감하게 된다.As described above, the present invention monitors the charge level of the secondary battery to drive the controller before overdischarge and charges the secondary battery with the power of the main battery using a DC / DC converter, thereby preventing overdischarge of the secondary battery. It can reduce the maintenance cost of the electric vehicle by extending the life of the battery as well as the stable operation of the electric vehicle.
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| KR1020000073323A KR20020044297A (en) | 2000-12-05 | 2000-12-05 | Auxiliary battery deep discharging protection system for electric vehicle |
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| KR101421506B1 (en) * | 2013-01-28 | 2014-07-22 | 주식회사 동남 | Apparatus for power supply of black box for vehicle |
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| KR20190042381A (en) * | 2017-10-16 | 2019-04-24 | 현대자동차주식회사 | Controlling method and system for starting of eco-friendly car |
| KR102501634B1 (en) * | 2022-05-02 | 2023-02-21 | 주식회사 이알인터내셔널 | Diesel Electric Forklift Modification System |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101421506B1 (en) * | 2013-01-28 | 2014-07-22 | 주식회사 동남 | Apparatus for power supply of black box for vehicle |
| KR101449266B1 (en) * | 2013-04-11 | 2014-10-15 | 현대자동차주식회사 | Control method of Low DC/DC Converter for electric vehicle, and Low DC/DC Converter control system using the same |
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| KR102501634B1 (en) * | 2022-05-02 | 2023-02-21 | 주식회사 이알인터내셔널 | Diesel Electric Forklift Modification System |
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