Behind the glory, there are huge hidden worries. The hollowing out of automobile technology in China will affect the healthy development of automobile industry sooner or later. steam
If the automobile industry wants to maintain long-term prosperity, independent research and development, independent intellectual property rights and independent brands are undoubtedly the key, which is in the automobile industry.
The auto parts industry is more prominent. The R&D investment of auto parts enterprises in China is insufficient, and the R&D capability is weak.
It has seriously restricted the establishment of independent brands in China.
Anti-lock braking system, as one of the standard accessories of modern cars, can control the operation of vehicles in emergency braking.
The stable function ensures the active safety of the car.
This paper takes the vehicle dynamics model and wheel speed sensor, pressure regulator and electronic controller in anti-lock braking system as examples.
The research object, taking its structure and function as the research content, adopts the research method of combining theoretical analysis with simulation test.
On the basis of summarizing the research results at home and abroad, the layout scheme and control strategy of anti-lock braking system are analyzed and studied.
A little. The main work of this paper is as follows:
(1) extensively consult the control strategies and vehicle power of wheel speed sensors, hydraulic regulators and electronic controllers at home and abroad.
Learn the literature related to vehicle structural design, testing and manufacturing, and understand the development and latest situation of related technologies at home and abroad.
On the technical level, the successful research and development experience of automobile anti-lock braking system is analyzed and summarized.
(2) The technical difficulties such as real-time pavement identification and pressure adjustment faced by ABS system at present are carefully analyzed.
Processing, manufacturing and assembly of equipment. And put forward the corresponding solutions.
③ Establish the mathematical model of anti-lock braking system, including vehicle dynamics model, pressure regulator model and electronics.
Controller model, on this basis, the overall simulation model of anti-lock braking system is established.
④ Using MATLAB/Stateflow, the self-optimizing control strategy algorithm and state flow are designed and realized.
Using MATLAB/Simulink to simulate and analyze the model, it is found that when the piston of the master cylinder and the inner wall of the cylinder hole brake,
When the clearance exceeds a certain value, the pressure of the brake master cylinder will fluctuate, and the fluctuation amplitude will also increase with the increase of the clearance.
On the pavement with high adhesion coefficient, in order to make full use of the pavement height, the braking pressure should be adjusted at a higher frequency.
Adhesion characteristics, improve the braking efficiency of vehicles. The designed control algorithm can realize real-time identification of pavement characteristics and has strong robustness.
Quickly identify the optimal slip rate of pavement and keep it near the optimal slip rate, so that the system can make full use of pavement.
Characteristics, to achieve the best braking effect.