| Due to the automobile pollution to the environment and energy-saving emission reduction development direction of vehicle with high efficiency and lowe mission is coming. Having good environmental protection performance and significant feature variety of energy as their driving force,the Electric cars can adjust the energy structure and ensure energy security. Duing to battery power supply, volume and cost constraints,the pure electric vehicles’s range is undesirable. Aiming at those drawbacks of pure electric vehicles, this paper subjects to design a control system for Journey Increasing Model of Electric-auto(EREV), increasing a Range Extender on the pure electric car to extend range by Range Extender in the case of the insufficience of battery power supply.The power system is mainly divided into:extender power generation system, motor drive system. Extender assembly control system is mainly composed of the upper control the EMS network VCU, engine control unit, engine, generator, generator controller IPU, start machine and high and low voltage wiring harness, into the exhaust system. Motor drive system is mainly composed of permanent magnet synchronous ac motors, motor controllers, cooling system, the battery supply system, battery management unit. To determine the two sets of system communication network, spare parts specifications match, control requirements and architecture as the main research direction.Project completes the design of Journey Increasing Model of Electric-auto(EREV)’s control mode by analysing its advantages and disadvantages,structure and principle,energy storage, the form of motor,overview analysis one by one arounding the electric car working principle such as battery current, power regulator,motor, power transmission system and the car driving. Complete program main supplied with battery power electric cars, drivers driving; When lithium battery is insufficient for vehicle controller can brake control extender startup power, and provide sufficient electric power for vehicles continues to walk; When the vehicle needs to climb, the battery can’t provide enough power, need additional energy supply, extender must start right now, an additional energy, ensure driving demand; The vehicle control system must have fault diagnosis, high pressure safety detection and protection function.Subject through the theoretical formula calculation speed and the torque of the motor parts in the relationship, the relationship between speed and power, the relationship between power and torque and power system such as drive motor related parameters, the extended range of electric parameters are obtained by software simulation; According to the results of the analysis put forward corresponding rights Range Extender module research methods, the complete rights Range Extender special selection of engine, determined to add program design method of electric vehicle extender core components and the corresponding constraint conditions. Analysis according to the practical application environment situation Range Extender electric main control strategy, complete the fit subject of a test study, and records the corresponding data.The research programs Journey Increasing Model of Electric-auto(EREV)’s control principle, and expounds the test method. Easing people worry about resources and environment pollution, solved the problem of pure electric vehicle range is too short, greatly improve its economic benefit and so on. During the research we met with difficulties are inevitable, including the battery energy storage unit rate is too small, electric vehicle purchase costs and maintenance costsare too high,etc. So finally, the paper analyzes the main problems that the electric cars face by, and prospectes its future development. |
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