B50轿车怠速起步停车工况节油减排控制技术的研究

发布时间：2018-06-01 16:19

本文选题：怠速起停 + BSG系统　；参考：《吉林大学》2016年博士论文

【摘要】：随着中国汽车销售量的逐年增加,目前中国已成为全球汽车销售量最高的国家。从而带来中国石油消耗急剧增长,大气污染日益严重。针对这些问题国内外政府相继出台了更加严格的汽车油耗及排放法规,各车企都在开展节油减排技术的研究。B50轿车以其稳定的质量和卓越的驾驶性能在用户中享有很好的口碑,但有部分用户反映B50轿车油耗和排放偏高。基于上述背景,本文提出对B50轿车进行节油减排研究。B50轿车是在产车型,因此在进行节油减排技术开发时要确保车辆更改小、成本增加少及开发周期短,进而提高B50轿车的性价比及市场竞争力。怠速起步停车技术降油耗效果显著,且整车更改小,成本增加少,因此本文选择怠速起停技术作为B50轿车节油减排的研究方向。BSG(Belt driven Starter Generator带驱动起动发电一体机)起停系统作为微混合动力技术不但能实现怠速起停功能,还能实现制动能量回收和低速扭矩辅助功能,并且起动噪声小,因此本文将BSG起停技术作为B50轿车节油减排的技术方案。BSG电机扭矩控制,发动机、自动变速箱与整车的协同控制是BSG起停系统节油减排的关键技术,本文采用数学建模、仿真分析和试验验证相结合的方法,对其进行了重点研究,主要研究内容如下:1.使用Admas软件建立BSG起停系统发动机前端轮系动力学模型。对张紧器的结构及性能参数进行优化设计,确定张紧器性能及结构的最优设计参数。并应用该参数对前端轮系进行仿真分析,仿真结果证明本文设计的前端轮系可实现发动机快速稳定起动。2.根据BSG起动/发电一体机功能及性能要求对电机进行选型,建立BSG电机的数学模型。为提高BSG车辆的起动和低速扭矩性能,本文制定了BSG电机励磁电流控制策略。使用Matlab/Simulink搭建BSG电机驱动系统仿真模型,分析励磁电流控制策略对BSG电机系统的稳态性能和动态性能的影响。仿真结果表明:本文提出的励磁电流控制策略使得BSG电机具备了低速大转矩及快速响应等性能优点,有效提高了发动机的起动性能,保证了车辆怠速起停功能的稳定性。3.在重点考虑驾驶员安全性、驾驶舒适性和燃油经济性的基础上,制定了BSG起停系统整车控制策略,并设定相关重要参数的阈值。应用CRUISE软件对BSG起停系统进行仿真分析,结果证明BSG起停系统可有效降低油耗。针对车辆冷起动和起步阶段排放污染物高的问题,本文提出了发动机、变速箱协同控制策略。通过控制变速箱升档来增加发动机喷油量,缩短催化器起燃时间,从而降低车辆冷起动和起步阶段排放污染物。4.研制BSG起停系统关键零部件,搭建BSG起停系统样车。在转毂试验台及城市实际道路上,进行实车油耗测试。结果证明本文制定的BSG起停系统控制策略可有效降低车辆使用油耗。在台架上对车辆冷起动和起步阶段降排放控制策略开启及关闭两种状态进行排放测试,结果表明本文制定的排放控制策略可加速催化器起燃,可有效降低车辆冷起动及起步阶段排放污染物。对样车进行-25℃的低温冷起动测试,测试结果为车辆一次性点火起动成功,起动时间小于0.5s,且发动机起动稳定。证明车辆前端轮系设计合理,BSG电机起动扭矩控制策略正确有效。整车性能测试通过后,对车辆进行起停系统边界条件测试,车辆安全及功能测试。测试结果全部满足功能及性能要求,样车通过验收。本文通过在B50轿车上开发BSG起停系统并进行整车台架及道路试验,来研究B50轿车怠速起步停车工况的节油减排技术。研究结果表明本文开发的BSG电机、发动机及自动变速箱协同控制技术正确有效,实现B50轿车综合工况节油5%以上,排放污染物降低10~20%。本文研制的BSG起停系统样车功能及性能测试满足驾驶员安全性及舒适性要求。本文研究成果为车辆节油减排提供了技术方案,对推广BSG起停系统的应用具有实际意义,为后续48V系统在轿车上的开发应用奠定了实践基础。
[Abstract]:With the increase of Chinese car sales year by year, China has become the highest car sales country in the world. Thus, China's oil consumption is increasing rapidly and the air pollution is becoming more and more serious. In view of these problems, more stringent automobile fuel consumption and discharge regulations have been issued by the government at home and abroad, and all the enterprises are developing the technology of reducing oil and emission reduction. .B50 sedan enjoys a good reputation among users with its stable quality and excellent driving performance, but some users reflect the high fuel consumption and high emission of B50 cars. Based on the above background, this paper puts forward the research on the emission reduction and emission reduction of B50 cars,.B50 car is in the production model, because this is to ensure the development of oil saving and emission reduction technology. The vehicle change is small, the cost is less and the development cycle is short, and then the performance price ratio and market competitiveness of the B50 car are improved. The idle speed starting parking technology has a significant effect on reducing the oil consumption, and the change of the vehicle is small and the cost is less. Therefore, this paper chooses the idle start and stop technology as the research direction of the oil saving and drainage of the B50 car.BSG (Belt driven Starter Generator belt) As a micro hybrid power technology, the starting and stopping system can not only realize the idle stop function, but also realize the braking energy recovery and the low speed torque auxiliary function, and the starting noise is small. Therefore, this paper takes the BSG starting and stopping technology as the technical scheme of the B50 car's fuel saving and emission reduction,.BSG motor torque control, engine, automatic transmission The key technology of fuel saving and emission reduction in BSG starting and stopping system is the key technology of the coordinated control between the box and the whole vehicle. In this paper, the main research contents are as follows: 1. using the mathematical modeling, simulation analysis and test verification, the main research contents are as follows: 1. using the Admas software to establish the dynamic model of the front wheel system of the starting and stopping system of the BSG stop system. The performance parameters are optimized and the optimal design parameters of the performance and structure of the tensioner are determined. The simulation results of the front wheel system are carried out with this parameter. The simulation results show that the front wheel system designed in this paper can realize the fast and stable start of the engine starting.2., which is based on the function and performance requirements of the BSG starting / generating unit. The mathematical model of the BSG motor. In order to improve the starting and low-speed torque performance of the BSG vehicle, the excitation current control strategy of the BSG motor is formulated. The simulation model of the BSG motor drive system is built with Matlab/Simulink, and the influence of the excitation current control strategy on the steady-state performance and dynamic performance of the BSG motor system is analyzed. The proposed excitation current control strategy makes the BSG motor have the advantages of low speed and large torque and rapid response, which can effectively improve the starting performance of the engine and ensure the stability of the idle start and stop function of the vehicle..3., based on the driver's safety, driving comfort and fuel economy, has formulated the whole BSG starting and stopping system. The vehicle control strategy and the threshold of the important parameters are set. The simulation analysis of the BSG starting and stopping system is carried out with CRUISE software. The result shows that the BSG start stop system can effectively reduce the fuel consumption. In view of the problem of high emission of pollutants in the cold starting and starting stages of the vehicle, this paper proposes a coordinated control strategy of the engine and the gearbox. In order to increase the fuel injection of the engine and reduce the starting time of the catalyst, the key parts of the BSG starting and stopping system are developed by.4., and the prototype of the BSG starting and stopping system is set up. The actual vehicle oil consumption test is carried out on the hub test bench and the actual city road. The results prove that the BSG starting and stopping system is controlled by this paper. The strategy can effectively reduce the fuel consumption of vehicles. On the bench, the emission control strategy of the cold start and start stage of the vehicle is opened and closed in two states. The results show that the emission control strategy developed in this paper can accelerate the combustion of the catalyst, and can effectively reduce the emission of the vehicle in cold start and start stage. At low temperature cold start test at -25 C, the results show that the starting time of the vehicle is successful, the starting time is less than 0.5s, and the starting of the engine is stable. It is proved that the design of the front wheel system is reasonable and the starting torque control strategy of the BSG motor is correct and effective. After the vehicle performance test passes, the vehicle's lifting system boundary condition is tested and the vehicle safety is carried out. Complete and function test. The test results all meet the function and performance requirements, the sample car passes the acceptance. This paper studies the technology of reducing oil and emission reduction for the idle start stop working condition of the B50 car by developing the BSG starting and stopping system on the B50 car and carrying out the whole vehicle bench and road test. The results show that the BSG motor, engine and auto change of this paper are developed in this paper. The speed box cooperative control technology is correct and effective. The B50 car has more than 5% fuel saving and the emission of pollutants is reduced by 10~20%.. The function and performance test of the BSG starting and stopping system can meet the driver's safety and comfort requirements. The results of this paper provide the technical scheme for the vehicle fuel saving and emission reduction, which should be used to popularize the BSG starting stop system. It has practical significance and lays a practical foundation for the subsequent development and application of 48V system on cars.
【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：U471.23

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