Abstract:
PURPOSE: A method of controlling auxiliary battery for electric vehicle is provided to effectively utilize the regenerated energy by controlling the charge voltage of a DC/DC converter and capacity of an auxiliary battery. CONSTITUTION: A method comprises a step(110,120) of operating an electric vehicle and a DC/DC converter of the electric vehicle; a step(130) of judging whether a brake signal is input during operation of the electric vehicle; a step(140) of comparing a set voltage(Vs) of the DC/DC converter and a terminal voltage(Vo) of an auxiliary battery and judging whether the set voltage of the DC/DC converter is higher than or same as the terminal voltage of the auxiliary battery, if the brake signal is not input; and a step(150) of charging the auxiliary battery, if the condition in the previous step(140) is satisfied.
Abstract:
PURPOSE: A method for controlling a temperature is provided to obtain the maximum output from the battery by controlling actively the temperature of the battery. CONSTITUTION: An operating state of a sport mode is checked(110). A temperature of a battery for hybrid electric vehicles is compared to a first setup temperature if the sport mode is operated(120). An operation of a heater connected to an air conditioning system for hybrid electric vehicles is stopped if the temperature of the battery for hybrid electric vehicles is more than the first setup temperature(130). The temperature of the battery for hybrid electric vehicles is compared to a second setup temperature(140). The temperature of the battery for hybrid electric vehicles is compared to a third setup temperature if the temperature of the battery for hybrid electric vehicles is more than the second setup temperature(150). A cooling fan is operated in a first step if the temperature of the battery for hybrid electric vehicles is not more than the third setup temperature(160).
Abstract:
하이브리드 전기 자동차에서 모터/발전기를 이용한 엔진의 강제 구동을 통해 엔진의 부압이 형성되도록 하여 엔진 정지의 조건에서 연료 시스템의 리크 진단이 이루어지도록 하는 것으로, 하이브리드 전기 자동차의 주행중 검출되는 정보가 연료 시스템의 리크 진단조건을 만족하는지 판단하는 과정과, 리크 진단조건을 만족하면 운전 및 차량 제어정보를 판독하여 모터/발전기의 보조에 의한 부압 발생조건을 만족하는지 판단하는 과정과, 모터/발전기의 보조에 의한 부압 발생조건을 만족하면 모터/발전기를 통해 엔진의 강제 구동시켜 부압을 생성시키는 과정 및 엔진 부압의 생성에 따라 연료 시스템의 리크 진단을 수행하는 과정을 포함한다. 하이브리드 전기 자동차, 리크 진단, 엔진 부압, 강제구동
Abstract:
PURPOSE: An energy supply system for electronic power steering of an electric vehicle and a method thereof are provided to improve the performance of the vehicle, to enhance reliability, to reduce weight of an electric wire by reducing the thickness of the electric wire, to lighten the vehicle through weight reduction of a DC/DC converter, and to reduce the cost. CONSTITUTION: An energy supply system for electronic power steering of an electric vehicle has a motor(22) for power steering and an inverter(21) for power steering to drive the electronic power steering, to receive energy from a driving battery or a fuel cell stack(23) and supply the energy to the inverter for power steering at normal times. The energy supply system has switching elements(31) to enable a controller installed to the electric vehicle to receive a fault signal and to change a flow of energy to an auxiliary battery(24) and to supply the energy to the electronic power steering to move the electric vehicle when the driving battery or the fuel cell stack fails.
Abstract:
PURPOSE: An apparatus for compensating a voltage of an auxiliary battery of an electric vehicle is provided to enhance the reliability and stability by supplying constantly driving voltage to plural load portions. CONSTITUTION: An apparatus for compensating a voltage of an auxiliary battery of an electric vehicle includes a main control portion(210), a DC/DC converter(220), a first voltage detection portion(250), a second voltage detection portion(260A-260n), and a compensation value detection portion(270). The main control portion(210) outputs a PWM control signal for supplying a voltage of a main battery. The DC/DC converter(220) is used for converting the voltage of the main battery to a required voltage by performing a PWM switching operation. The first voltage detection portion(250) detects a voltage of an output terminal of the DC/DC converter(220). The second voltage detection portion(260A-260n) detects voltages of input terminals of plural load portions(240A-240n). The compensation value detection portion(270) detects a compensation value from the voltage of the first voltage detection portion(250) and the voltage of the second voltage detection portion(260A-260n) and applies the detected compensation value to the main control portion(210).
Abstract:
PURPOSE: A battery pack for an electric vehicle is provided to allow the electric vehicle to operate even upon occurrence of breakdown of the battery module. CONSTITUTION: A plurality of cells are stacked into a battery module(41), and a plurality of modules are stacked into a battery pack. Each of battery modules has a relay circuit(42), in such a manner that the battery module is connected to a contact(A) at ordinary times so as to supply voltage to an inverter and drive an induction motor, and switched to a contact(B) upon occurrence of breakdown of any of modules. Therefore, it is possible to remove only the module which is broken down.
Abstract:
PURPOSE: A charging apparatus and a charging method are provided to allow for a free voltage charge by automatically detecting an AC voltage applied from an external source for charge of a driver battery. CONSTITUTION: A charging apparatus comprises an input voltage sensing unit(100) for detecting whether an AC power for charge of a driver battery is input from an external source; a first switch(SW11) and a second switch(SW12) which are switched in accordance with the control signal applied from the input voltage sensing unit; a transformer for dropping the input AC power to the preset level; inductors(L11,L12) for inducing the AC power supplied through the transformer; smoothing capacitors for smoothing positive and negative phase potentials; single phase full-bridge diodes(D11 to D14) for rectifying the AC power which is level-dropped and applied; a selection switch(SW13) which is switched by the control signal applied from the input voltage sensing unit; and a first rectifier capacitor(C14) and a second rectifier capacitor(C15) connected to the output terminal of the single phase full-bridge diode, and which charge the rectified DC voltage.
Abstract:
A gas leak checking method of a fuel system is provided to compare a difference between an inner pressure and an outer temperature of the fuel system to diagnose gas leakage. A gas leak checking method of a fuel system includes the steps of comparing an outdoor temperature of a vehicle with a temperature of cooling water by using an engine control unit to detect a soaking state of the vehicle(S200), closing a shut-off valve of the fuel system to close the interior of the fuel system to make the interior have a certain volume(S300), and measuring a pressure in a fuel tank by using a fuel tank pressure sensor(S500). After closing the fuel system, an outdoor temperature of the fuel system is measured. After measuring the inner temperature, a monitoring step is performed. In the monitoring step, the pressure and the temperature are monitored at predetermined time periods. The pressure and the temperature are measured during the inner pressure measurement step and the outer temperature measurement step by using the engine control unit.
Abstract:
PURPOSE: A system and method for supplying power(12-voltage) to a vehicle operated at power (42-voltage) are provided to efficiently use energy by selecting one battery relatively having the much available power out of three 12-voltage batteries comprised in a 36-voltage battery. CONSTITUTION: A system for supplying power(12-voltage) to a vehicle operated at power(42-voltage) includes a 36-voltage battery(10), a relay(20), and a BMS(30). The 36-votage battery stores the power generated at a 42-voltage generator and includes three 12-voltage batteries(11,13,15) connected in series. The relay selects one of the three batteries. The BMS(Battery management System) measures available power of the three batteries and controls the relay so as to select the one having the maximum available power of the three batteries.
Abstract:
PURPOSE: A cooling fan control apparatus and a cooling fan control method are provided to extend the lifespan of a battery pack by reducing temperature variation of a battery module and permitting the battery module uniform to have a uniform capacity. CONSTITUTION: A cooling fan control apparatus comprises a cooling fan arranged in an electric vehicle so as to cool the electric vehicle; a motor(21) connected to the cooling fan so as to drive the cooling fan; a switch(22) connected to the motor so as to switch the operation of the motor; a three-stage relay(23) connected to the switch so as to turn on/off the switch; and an electronic control unit for controlling the three-stage relay so as to control the rotation direction of the cooling fan in such a manner that air flows toward an outside of the electric vehicle during charging of the electric vehicle.