基于PID的汽车定速巡航控制系统的研究(2)

基于PID的汽车定速巡航控制系统的研究

Research on Automobile Cruise Control System

Based on DSP

Abstract：With the development of automobile industry and carrying trade，

automobile will be more and more widespread．More comfortable，more convenient

and safer vehicle will be needed．Automobile cruise control system，which not only

could relieve the drivers’ burden but also could make the driving comfortable，is a

kind of accessorial driving system．Cruise control system has high nonlinearity and

non-determinacy with time changing．And CCS，which is effected by some factors

such as external load disturbers and complicated running modes，will not have a good

running effect with the traditional PID contr01．A kind of CCS which is based on

Fuzzy PID control is introduced in the thesis．

First，the background of cruise control system and its status and developing

trend is expatiated on in the dissertation．The composing of CCS is also introduced in

detail．The principium of CCS is described by analyzing a kind of closed loop

system．

After analyzing the cruise control system briefly, Fuzzy-PID is confirmed as the

control method of the system．Then the Fuzzy PID controller is designed．As the

object is a car, the thesis analyzes the resistances and disturbs while the car’s

running．And the automobile dynamics model is given．After setting up the model by

means of MATLAB，the result is analyzed．From the result，we may know that Fuzzy

PID control could make the overshoot smaller and the response time shorter．The

effect of Fuzzy PID method is given，SO it is a suitable method for CCS．

Paper is based on the traditional automobile cruise control system, improved and optimized the PID control. Play to the advantages of fuzzy control to improve the

existing vehicle cruise control system, so that the control process has some

intelligence. Cruise control will help to improve the effectiveness and reduce the

speed of change, the maximum fuel savings and reduce exhaust pollution, improve