为解决行驶在超高速公路上的高速智能车与前方低速车辆碰撞的安全问题，用联合仿真的方法研究了车辆制动避撞系统。通过CarSim软件建立车辆动力学模型，并设置前方车辆参数、道路参数和传感器参数，在MATLAB/Simulink中建立基于车间距和车速的控制模型，通过CarSim软件的输入与输出参数接口模块建立信号连接。当前车车速为100、120和140 km/h，智能车车速为140、160和180 km/h时，控制模型通过传感器采集到的实时距离与速度对智能车发出制动减速信号，建立超高速公路行驶车辆紧急制动避撞策略。研究结果表明：当道路附着系数为0.60，超高速公路汽车行驶在平坦的直线路段上进行制动时，最佳轮缸压力为7 MPa，此时，车辆速度为160 km/h时汽车的制动距离为170.3 m，前车以速度100、120和140 km/h匀速行驶，智能车车速分别以140、160和180 km/h制动到与前车车速一样时，所需要的相对距离分别为10.8、10.7和10.5 m。设置路面附着系数为0.60，前车车速分别为100、120和140 km/h，初始轮缸压力为1 MPa，智能车制动减速到与前车车速一样时，智能车前悬距前车后悬距离分别为3.1、3.5和3.8 m，其他条件不变，当初始轮缸压力为3 MPa，智能车制动到与前车车速相同时，智能车前悬距前车后悬距离分别为7.0、7.3和7.7 m。通过搭建的CarSim/Simulink汽车紧急制动避撞控制联合仿真平台，验证了超高速公路制动避撞模型的有效性和准确性，可以提高超高速公路行车的安全性。

To solve the safety problem of collision between a high-speed intelligent vehicle and a low-speed vehicle on the superhighway, the vehicle braking collision avoidance system was studied by using the method of co-simulation. CarSim was used to establish the vehicle dynamics model and set the front vehicle parameters, road parameters and sensor parameters, and the control model based on vehicle distance and speed was established in MATLAB/Simulink. The signal connection is established through the input and output parameter interface module of CarSim software. When the speed of the front car is 100, 120 and 140 km/h, and the speed of an intelligent vehicle is 140, 160 and 180 km/h, respectively, the control model sends the braking deceleration signal to the intelligent vehicle through the real-time distance and speed collected by the sensor and establishes the emergency braking collision avoidance strategy for the vehicle on the superhighway. The results show that when the road adhesion coefficient is 0.60 and the car is braked on the flat straight section of the superhighway, the optimal wheel cylinder pressure is 7 MPa, and at this time, the braking distance of the car is 170.3 m at a speed of 160 km/h. The front car travels at a speed of 100, 120 and 140 km/h, and the smart car brakes at 140, 160 and 180 km/h, respectively, to the same speed as the car in front, requiring relative distances of 10.8, 10.7 and 10.5 m, respectively. When the road adhesion coefficient is 0.60, the vehicle speed of the front vehicle is 100, 120 and 140 km/h, respectively. When the initial cylinder pressure is 1 MPa and the intelligent vehicle braking decelerates to the same speed as the front vehicle, the distance between the front suspension of an intelligent vehicle and the rear suspension of the vehicle in front is 3.1, 3.5, and 3.8 m, respectively. When the initial cylinder pressure is 3 MPa and the intelligent vehicle braking decelerates to the same speed as the front vehicle, the distance between the front suspension of an intelligent vehicle and the rear suspension of the vehicle in front is 7.0, 7.3, and 7.7 m, respectively. Through the CarSim/Simulink co-simulation platform of vehicle emergency braking and collision avoidance control, the validity and accuracy of superhighway braking and collision avoidance model are verified, which can improve the safety of superhighway driving.