With the rapid development of intelligent vehicles, active suspension system, as a key technology to improve car comfort and safety, has received widespread attention. To improve the smoothness and safty of vehicle driving, passive suspension and active suspension 1/4 vehicle two degree of freedom models are established based on the theory of vehicle system dynamics. Using the realistic road data as an excitation, and the quadratic optimal control algorithm is applied to active model control. A comparative analysis was conducted on the key indicators of vehicle between active suspension and passive suspension using the Simulink simulation platform. Simulation data confirms that the control strategy can effectively improve the overall performance of the suspension.
The response characteristics of the high-pressure common rail injector affect the fuel injection characteristics of the diesel engine, which in turn affects the engine's power and emission performance. This paper takes the high pressure common rail injector as the research object, uses the AMESIM to simulate and analyze the high-pressure common rail injector. Optimization Design the four key structural parameters and selected the optimization plan. By comparing the results of the injection law curve and the cycle injection quantity, it determined that the optimization plan is close to the actual demand value of the project, which proves the rationality of the optimization plan.
Before the advent of ABS, cars used open-loop braking system. It is impossible to adjust the brake pressure of wheel cylinder. Therefore, it is inevitable that the wheels on the ground is locked in the emergency braking. When the wheel is locked, the car will appear the problems of bad braking efficiency and stability. ABS (Anti-lock Braking System) controller can maintain the appropriate braking stability by adjusting the value of braking force for purpose of avoiding axle sideslip. In order to analyze the braking performance of vehicles with and without ABS, the mathematical model of single wheel vehicle is established by using the dynamics theory. Moreover, The wheel model based on magic formula、Hydraulic braking model、Slip rate model、PID cotrol model are simultaneously established by Simulink. At last, These models are respectively combined into a ABS control braking model. Simulation results show that the car with ABS control strategy can obtain better braking efficiency and stability compared with no ABS.
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