Abstract
To improve automobile travel safety and relieve the intension of driving fatigue, a synergetic strategy on the throttle and brake combined control of automobile cruise system is proposed based on fuzzy control theory. A hierarchical control structure, including the upper fuzzy controller and the lower model match controller, is designed for integrated control function. The upper controller consists of the two input variables, that is, the deviation of the theoretical safe distance and the relative distance and the relative velocity between the host car and the preceding vehicle, and the single output variable, that is, the excepted acceleration of host car. The lower controller has achieved the fast compensation of excepted acceleration by adopting parallel feedforward and feedback compensator to input into the inverse dynamics model of automobile cruise system. Using MATLAB/Simulink, the control function on the proposed synergetic strategy is validated for different working cases. The results show that the synergetic strategy possesses an integrated capability involved automated stop & go control, and following the preceding car to prevent rear-end collision, and the constant velocity cruise whether the driving conditions of the city road or expressway.
Highlights
With the rapid growth of vehicles’ number in the world, traffic jams and accident rate continue to rise in every major city of the world that townspeople’s travel environment and life safety are influenced seriously
It was known that the adaptive cruise control (ACC) system, as driver assistance systems, can adjust the host car’s velocity to keep a safe distance with the preceding car through obtaining the lidar’s or radar’s information
Mainly used in highway driving condition when the velocity is over 40 km/h, and it does not suit for city traffic environment with the high density and the slow velocity
Summary
With the rapid growth of vehicles’ number in the world, traffic jams and accident rate continue to rise in every major city of the world that townspeople’s travel environment and life safety are influenced seriously. Namely the intelligent following mode, the theoretical safe distance sa is regarded as the minimum derived from the product of the total time as mentioned previously and the velocity vh from the host car or the setting cruise velocity Vs. the indexes on the actual velocity (vh) and acceleration of the host car, the engineer’s rotate speed, and so on, are obtained and fed back to the data center by the host car sensor and vehicle-mounted scanning laser radar. We know from the “Synergetic strategy of automobile intelligent cruise system” section that the role of setting the inverse longitudinal dynamic model of the cruise system is to obtain the expected throttle opening and braking force according to the expected acceleration. How to realize the deceleration requirement by reducing the throttle opening value or triggering the brake actuator? To
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
