Abstract:
The present invention relates to an apparatus and a method for distributing torque in an electric military vehicle with four wheels which distribute the torque to the front and rear wheels of an electric vehicle in consideration of the efficiency of a motor and the gradient of a road whereon the electric vehicle runs. According to the present invention, the method for distributing the torque in an electric military vehicle with four wheels comprises: an efficiency-first torque distribution rate calculating step (S120) for distributing driving torque to front and rear motors (11, 21) to operate the front and rear motors (11, 21) with high efficiency; a gradient-first torque distribution rate calculating step (S130) for distributing the driving torque required for operating an electric vehicle on the front and rear motors (11, 21) using a value predetermined according to the gradient of the road where the electric vehicle runs; a gradient determining step (S140) for comparing the gradient of the road where the electric vehicle runs with a reference value and determining wheel slip conditions when the electric vehicle runs on the gradient road; and a torque distribution step (S150) for controlling the front and rear motors (11, 21) using the rate calculated in the efficiency-first torque distribution rate calculating step (S120) according to the gradient determined in the gradient determining step (S140) or controlling the front and rear motors (11, 21) according to the rate calculated in the gradient-first torque distribution rate calculating step (S130). [Reference numerals] (AA) Start; (BB) End; (S110) Measuring a gradient; (S120) Calculating the torque distribution according to the efficiency of a motor; (S130) Calculating the torque distribution according to the gradient; (S141) Within a reference range of the gradient?; (S142) Gradient > (+) standard value & T_fme (-) standard value & T_fme
Abstract:
PURPOSE: Provided is electrorheological (ER) fluids which have effective ER effect over a broad range of temperature, showing stable Bingham behavior per changes in temperature and electric field, by having semiconducting polyaniline particles dispersed in a non-conductive medium such as silicone oil. CONSTITUTION: The electrorheological fluids wherein 10-20 % by volume of polyaniline particles at pH 7.5-10.0 are dispersed in a non-conductive medium, are prepared by a method comprising: (1) carrying out polymerization of aniline in 1M aqueous hydrochloride solution at -10 to 5 deg.C to provide polyaniline particles; (2) milling the polyaniline obtained from the step (1), and selecting particles of 1-10 micrometer by sieving; (3) adjusting the pH of the resulted particles to 7.5-10.0 with aqueous sodium hydroxide solution; and (4) dispersing the obtained particles into a non-conductive solvent selected from a group consisting of silicone oil, transformer oil, transformer insulating solution, mineral oil, olive oil, and mixtures thereof.
Abstract:
PURPOSE: A propellant activate apparatus of a four-wheel hybrid vehicle and method thereof are provided to improve the acceleration performance and hill climbing ability of a vehicle by simultaneously operating a front axle and a back axle. CONSTITUTION: The propellant activate apparatus of a four-wheel hybrid vehicle includes a front wheel electric motor(110), a rear wheel electronic motor(120), a generator(130), an engine(140), a battery(150), and an ultra-capacitor(160). The front wheel electric motor connects to a front axis through a front wheel reducer(113). The rear wheel electric motor connects to the rear axis through a rear wheel reducer(123). The generator electrically connects to the power supply line of the rear wheel electric motor and the front wheel electric motor. The engine operates the generator. The battery electrically connects to the power supply line. [Reference numerals] (113) Front wheel reducer; (115,125,135) Inverter; (123) Back wheel reducer; (130) Electric generator; (140) Engine; (150) Battery; (160) Ultra capacitor; (167) DC/DC convertor; (AA) Power supply line
Abstract:
본 발명은 현수장치, 이를 구비하는 차륜형 차량 및 이동 로봇에 관한 것으로서, 상기 현수장치는, 차량의 일측에 부착되고, 로드휠이 고정 또는 지지되는 하우징과, 상기 하우징의 내부에 형성되며, 크랭크가 배치되는 크랭크실과, 서로 평행하게 배치되며, 상기 크랭크실과 연통되는 복수의 원통형 챔버와, 상기 복수의 원통형 챔버의 내부에 배치되며, 상기 원통형 챔버의 내벽을 따라 슬라이딩되며, 커넥팅로드에 의하여 상기 크랭크의 끝단과 연결되는 피스톤 및 상기 피스톤과 상기 원통형 챔버로 둘러 쌓여 형성되며, 상기 피스톤의 체적이 가변되며, 가스가 충전되어 있는 완충실을 포함한다. 이에 의하여 본 발명은 리딩암 상태에서의 로드암의 각도 조절기능을 수행할 수 있으며, 로드암이 트레일링암 상태나 리딩암 상태를 취하고 있는 경우에도 양방향으로 차량를 지지하면서, 스프링 및 댐핑기능을 수행할 수 있어 차륜형 차량 및 이동 로봇의 장애물 극복 능력을 획기적으로 향상시키는 현수장치를 제공한다.
Abstract:
PURPOSE: Motor drive torque controlling apparatus and method for an electric vehicle are provided to improve the fuel efficiency and the motor driving efficiency of a hybrid vehicle. CONSTITUTION: A motor drive torque controlling apparatus for an electric vehicle comprises the following: an accelerator pedal position sensor(10) generating an acceleration pedal position signal; a brake pedal position sensor(11) generating a brake pedal position signal; a speed sensor(20) detecting the speed of front and rear axles; a drive torque distribution controller(12) determining the ratio for distributing the drive torque on a drive motor; and first and second motor controllers controlling the drive torque of the drive motor.
Abstract:
PURPOSE: A suspending apparatus, a wheel type vehicle with the same, and a mobile robot are provided to support vehicle bodies and function as a spring though a load arm is positioned in a trailing arm or a leading arm. CONSTITUTION: A suspending apparatus comprises a housing(21), a crank-case(22), a chamber(24A,24B), a piston(26A,26B), and buffering chambers(27A,27B). The crank-case is formed inside the housing, and a crank(23) is arranged therein. The chamber is positioned in parallel and is connected to the crank-case. The piston glides along the inner wall of a plurality of cylindrical chambers. The volume of the buffering chamber is varied by the sliding of the piston.
Abstract:
The present invention relates to a power source of a series type hybrid electric propulsion system comprising an engine-generator, a battery, and an ultracapacitor. The present invention comprises modules for implementing maximum system efficiency by multiplying engine-generator efficiency with battery efficiency when the value of the state of charging (SOC) of the battery is lower than a SOC threshold, implementing maximum system efficiency by adding the engine-generator efficiency and battery efficiency for controlling the driving range of the battery in a section where the SOC is high when the SOC value of the battery is higher than the SOC threshold, and enhancing the overall system efficiency by lowering power supplied respectively to the battery and the ultracapacitor through distributing the power by combining the output of the battery with the output of the ultracapacitor. The present invention can improve the efficiency of the overall system by controlling the power source while simultaneously considering the efficiencies of the engine-generator, the battery, and the ultracapacitor. [Reference numerals] (AA) START;(BB) END;(S210) Calculating the power requested by a driver;(S220) State of battery charging
Abstract:
PURPOSE: Power controlling apparatus and method of a serial hybrid electric vehicle are provided to reduce the charging and discharging current of a battery by controlling the output of an engine/a generator. CONSTITUTION: The speed of an electric vehicle is detected in case of driving the electric vehicle(S11). If the detected speed of the electric vehicle is lower than or equal to a reference speed(S12), an engine/a generator operates with the maximum efficiency point according to the charged state of a battery. If the detected speed of the electric vehicle is more than the reference speed, the output of the engine/the generator is controlled based on the total consumption of power or the total supply of power.
Abstract:
PURPOSE: Electrorheological fluid with improved fluidity and reduced sedimentation of particles is provided by comprising dried water-soluble starch as conductive particles and additives. Therefore, the electrorheological fluid has various applications including a variable attenuation device capable of controlling a suspension system, vibration isolation system, and engine mount, or power transmission including brake, clutch, and the like. CONSTITUTION: The electrorheological fluid comprised of water-soluble starch particles, less than 5 wt% (excluding 0 %) of water based on the total weight of the fluid, additives for fluidity improvement and sediment inhibition, and non-conductive solvent is prepared by a method comprising the steps of: (1) milling the water-soluble starch particles to have less than 10 micrometer of particle size; (2) drying the obtained starch particles in an incubator at 35-45 deg.C and 30-50% of relative humidity; (3) mixing non-conductive solvent with additives; (4) adding thereto the starch particles obtained from the step (2) in an amount of 5-70 wt% based on the non-conductive solvent to obtain fluids; (5) heating the fluids at 100-150 deg.C; and (6) milling the fluid obtained from the step (5) for homogenous dispersion.