汽车主动防撞预警执行系统研究

发布时间：2018-04-23 14:33

本文选题：压力控制 + 占空比　；参考：《吉林大学》2016年硕士论文

【摘要】：汽车主动安全技术中的主动防撞预警系统是一个重要的研究课题,而主动防撞预警执行系统作为它的一个子系统,其性能对主动防撞预警系统有直接影响。本文依托于吉林省科技厅科技发展计划“汽车主动防撞预警系统的研究开发”项目,在本课题组对汽车主动防撞预警系统的研究基础之上,致力于研究一款汽车主动防撞预警执行系统,以满足汽车主动防撞预警系统的需求。本文根据汽车主动防撞预警执行系统设计的总体要求和执行系统功能要求,提出了汽车主动防撞预警执行系统总体设计思路和方案;设计了汽车主动防撞预警执行系统的主动制动执行机构液压系统原理图,并且对液压系统进行了集成化设计,将除液压电机泵以外的液压部件集成在一个阀体中,完成了主动制动执行机构液压阀块的设计。本文还设计了主动防撞预警执行系统的控制电路,提出了用模拟油门踏板信号替代踏板信号间接控制节气门开度的方法来实现对节气门的控制。本文采用XC836芯片设计了汽车主动防撞预警执行系统电控单元。本文利用Carsim、Simulink、AMEsim三个软件的各自优点,建立了汽车主动防撞预警系统和主动防撞预警执行系统的联合仿真模型,研究了汽车主动仿真预警执行系统的三角波液压跟随特性、阶梯液压跟随特性,验证了本文设计的汽车主动防撞预警执行系统具有良好的压力跟随特性;本文通过建立的汽车主动防撞预警执行系统模型求解控制轮缸压力的电磁阀控制信号的占空比和电机控制信号的占空比并输出给主动制动执行机构的电磁阀和液压泵电机,实现制动轮缸压力的精细控制,并通过建立的主动防撞预警系统模型研究了汽车主动防撞预警执行系统在良好路面和冰雪路面制动工况下的制动响应特性,仿真结果证明本文设计的主动制动执行机构能够将轮缸压力误差控制在10%以内,验证了主动防撞预警执行系统的良好性能。此外,本文通过联合仿真验证了主动防撞预警执行系统具有实现ABS功能的可行性,仿真结果说明主动防撞预警执行系统的主动制动执行机构具有良好的轮缸压力精确控制功能,能够实现防抱死功能,该结论为主动防撞预警执行系统和ABS系统、ESP系统等的集成提供了依据。
[Abstract]:Active anti-collision early warning system is an important research subject in the active safety technology of automobile. As one of its subsystems, the performance of active anti-collision warning system has a direct impact on the active anti-collision warning system. This paper is based on the project of "Research and Development of Automobile active Anti-collision warning system" in the Science and Technology Development Plan of Jilin Provincial Science and Technology Department, and on the basis of the research on the active anti-collision early-warning system of automobile by our research group. In order to meet the demand of automobile active collision warning system, a vehicle active anti-collision warning system is studied. According to the overall requirements of the design and function of the vehicle active anti-collision warning system, this paper puts forward the overall design idea and scheme of the vehicle active anti-collision warning system. The hydraulic system schematic diagram of the active brake actuator is designed, and the hydraulic system is integrated into one valve body except the hydraulic motor pump. The design of hydraulic valve block of active brake actuator is completed. This paper also designs the control circuit of active anti-collision warning system, and puts forward a method of indirectly controlling throttle opening degree by using analog throttle pedal signal instead of pedal signal to realize throttle control. In this paper, the XC836 chip is used to design the electronic control unit of automobile active collision warning and execution system. This paper makes use of the respective advantages of the three software Carsiman Simulink and AMEsim, establishes the joint simulation model of the vehicle active anti-collision warning system and the active anti-collision warning and executing system, and studies the triangle wave hydraulic following characteristics of the automobile active simulation early warning and execution system. The step hydraulic following characteristic verifies that the automobile active anti-collision warning system designed in this paper has good pressure-following characteristic. This paper solves the duty cycle ratio of solenoid valve control signal and the duty cycle ratio of motor control signal by the model of automobile active anti-collision warning system and outputs it to solenoid valve and hydraulic pump motor of active brake actuator. The precise control of brake wheel cylinder pressure is realized, and the braking response characteristics of automobile active collision warning system under good pavement and ice and snow pavement braking conditions are studied through the established active collision warning system model. The simulation results show that the designed active brake actuator can control the cylinder pressure error to less than 10% and verify the good performance of the active anti-collision warning system. In addition, the feasibility of the active anti-collision warning system is verified by the joint simulation. The simulation results show that the active braking mechanism of the active anti-collision warning system has a good precision control function of cylinder pressure. This conclusion provides a basis for the integration of active anti-collision warning execution system and ABS system.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.6

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