Four-way ring intersection traffic response control method

The invention discloses a four-way ring intersection traffic response control method and belongs to the technical field of intelligent traffic control. The method is characterized by introducing conceptions of front left turn and rear left turn so as to obtain nine basic principles of phase display sequences; establishing a technical architecture suitable for a flexible phase structure; arrangingan inlet requirement detector, a ring road queuing detector and a ring road outlet detector; acquiring head time interval and occupied time by adopting an independent detection mode of lanes; and defining ten key traffic events and three types of logic rules which comprises a phase switching rule, a deadlock management rule and a green time adjusting rule, wherein the phase switching rule is usedfor managing the duration of the phase switching process and determining whether to cut off red time of the next green phase; the deadlock management rule is used for judging a ring road deadlock state and managing a ring road unlocking process; and the green time adjusting rule is used for determining whether to cut off the green time of an inlet phase. The four-way ring intersection traffic response control method can timely adjust passing time resource supply according to short-time continuous change of motor vehicle traffic demand.