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:
The present invention relates to a method for controlling an engine-generator for supplying power in order to start serial hybrid combat maneuver equipment having a battery and drive motors therein. The method of the present invention comprises the steps of: (a) calculating a required power value, the total power of drive motors required by the driver; (b) assuming output values of an engine-generator from the minimum output thereof to the maximum output value thereof at regular intervals; (c) calculating an output value of a battery for satisfying the total power of the drive motor required by the driver using the assumed output value of the engine-generator and the required power value; (d) calculating an engine-generator efficiency value and a battery efficiency value, respectively; (e) calculating a system efficiency value of combat maneuver equipment for each of the assumed output values of the engine-generator using the engine-generator efficiency value and the battery efficiency value; and (f) selecting an assumed output value of the engine-generator if one among the system efficiency values is the highest value and controlling the engine-generator using the selected assumed output value. Thus, the method of the present invention can improve overall system efficiency and can enhance ease of operation and durability of system. [Reference numerals] (AA) Start;(BB) End;(S110) Calculate a power value required by the driver;(S120) Assume output values of an engine-generator;(S130) Calculate an output value of a battery;(S140) Calculate an engine-generator efficiency value;(S150) Calculate a battery efficiency value;(S160) Calculate a system efficiency value;(S170) Calculation of the system efficiency value completed?;(S180) Select the optimal output value of the engine-generator;(S190) Control the engine-generator using the selected output value
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