Design And Study On Compound Power System Of The Idling Start-stop System With Energy Recovery

With the government's increasing standards for fuel consumption,the idling start-stop technology manifests its relative advantages of low cost,obvious effect,can be put into use quickly compared with other energy-saving and emission-reduction technologies because the idling start-stop systems can reduce the time when vehicles are at idle so as to save fuel and reduce emissions.However,it is because lead-acid batteries of current idling start-stop system exists in insufficient starting ability,short working life and large range of starting voltage drop that this article studies compound power supply to deal with the idling start-stop system and the main work and achievements of this paper are as follows.In the first place,I analyze the characteristics of the energy storage batteries vehicle with idling start-stop system and compare their respective advantages and disadvantages in performance.According to the characteristics of the energy storage batteries,I select compound power supply made up of lead-acid battery and LIC because it can give full play to the advantages of high energy density of lead-acid battery and LIC of high power density.After that,a lot of work is done to research the characteristics of lead-acid battery,LIC and DC/DC converter and the corresponding simulation model is established.In the next place,according to the application environment of the idling start-stop system,the power supply management strategy is designed by using logic threshold control and fuzzy control.Through the secondary research of ADVISOR simulation software,the energy recovery generator model is established to realize energy recovery;a control strategy model is created to realize the power distribution;idling start and stop is achieved by modifying the control model;the idling start-stop system of hybrid power vehicle model with energy recovery is completed and the vehicle for power supply of composite power system and power supply of the single lead-acid batteries are simulated and compared.The results show that compared with the single lead-acid battery in the vehicle start-up process,the compound power provides larger start current and enhances engine starting performance.More energy is recovered and the energy recovery efficiency of the vehicle is improved in the process of vehicle deceleration.At last,the starting performance of the compound power supply and the common lead-acid battery is compared through the test bench;the kinetic energy is simulated when the vehicle is in a decelerating state and the energy recovery effect of energy storage battery is analyzed.And the results show that the starting time,the starting power and the start-up performance of the compound power supply are more excellent than the common lead-acid batteries.Simulation of vehicle deceleration kinetic energy through the recovery of inertial flywheel with LIC can satisfy the energy consumed by the engine starting without changing the driver's habits as well as the original performance of the vehicle to improve the vehicle energy utilization rate.