Research On Recover Vehicle Exhaust Gas Residual Energy Based On Permanent-Magnet Hybrid Magnetic Circuit Generating System And Control Technology

The use of exhaust gas turbine-driven permanent-magnet hybrid-magnetic-circuit generator recycling engine exhaust gas energy,which not only reduces automobile fuel consumption,but also complies with the national energy-saving emission reduction policy.The exhaust duct diameter,bending radius and throat contraction ratio of engine exhaust system were optimized and designed.Using ANSYS CFX software to analyze the speed and pressure of the exhaust pipe after optimization.Verify the exhaust system after optimization can improve the transmission efficiency of the exhaust gas energy.Determine the main parameters of turbine size by the thermodynamic calculation.Improve the turbine efficiency by the analysis of the turbine energy loss.The size of the permanent magnet,rotor structure parameters,stator and winding structure parameters were designed and calculated.By establishing the equivalent magnetic circuit graph of tangential permanent magnet and radial permanent magnet to analyze main magnetic circuit magnetic flux and leakage flux.Permeance and leakage permeance were calculated,and leakage magnetic coefficient calculation formula was deduced.By optimizing the design,reducing the magnetic flux leakage,improve the efficiency of the generator.The two-dimensional simulation model was modeled with the ANSOFT software,then the chart of magnetic force lines,magnetic flux density vector and magnetic flux density value were obtained.Through the comparison of the simulation results show that the design was feasible.The pulse width modulation voltage regulator circuit was developed and composed by input circuit,power conversion circuit,output circuit and negative feedback control circuit.It can make the generator output voltage steady on 14V±0.5V in wide range of speed and load state,and ensure the safety and reliability of vehicle’s electrical equipments.