Electronic toll collection system using laser radar in long communication area

Abstract

The invention relates to an electronic toll collection system using a laser radar in a long communication area. The electronic toll collection system comprises a lane main controller, a vehicle license plate recognition unit, an antenna, an electric railing, a charge amount display, a railing-dropping coil and a lane camera, wherein the antenna is projected towards the slanting downside to form an antenna communication coverage area, vehicle isolation devices are arranged at the both sides of the antenna communication coverage area, and the lane main controller is connected with the vehicle license plate recognition unit, the antenna, the electric railing, the expense amount display, the railing-dropping coil and the lane camera respectively; and the electronic toll collection system is characterized in that the lane main controller is connected with the laser radar. The electronic toll collection system disclosed by the invention has the beneficial effects that the vehicle passing speed and the trade success rate are ensured; the probability of reversing due to car-following interference is reduced; vehicle types can be recognized, so as to avoid the phenomenon of replacing an OBU (on-board unit) to escape charge; the instantaneous speeds of vehicles in a lane can be calculated; the vehicle congestion degree of an ETC (electronic temperature controller) lane can be calculated; the accurate positions of vehicles in case of effective communication can be recognized; and complete no cutting for a ground induction coil can be realized.

Description

(1) Technical field [0001] The invention relates to an electronic non-stop toll collection system, in particular to an electronic non-stop toll collection system in a long communication area using laser radar. (2) Background technology [0002] In the electronic non-stop toll collection system (ETC), the vehicle communicates with the antenna (RSU) through the on-board unit (OBU) to complete the electronic non-stop toll collection transaction. It is clearly stipulated in the charging standard. The adjustment of the communication area between the RSU and the OBU is a difficult point in the commissioning of the ETC lane system. The length of the communication area can be adjusted by adjusting the transmission power and inclination angle of the RSU, but the following problems exist in simply relying on the adjustment of the communication area: [0003] (1) When the communication area is too long, there will be situations where multiple vehicles are in the antenna communicat...

AI Technical Summary

Problems solved by technology

[0003] (1) When the communication area is too long, there will be situations where multiple vehicles are in the antenna communication area at the same time. When the vehicle in front has an abnormal transaction due to reasons such as no electronic tag, and the vehicle behind is normally traded, the ETC system cannot distinguish which one it is When a transaction is completed by a car, there will be the so-called car-following interference problem. At this time, the car in front is allowed to pass and the car behind cannot pass, which will cause user complaints or loss of expressway tolls

[0004] (2) If the length of the communication area is limited to ensure that when there is a car in front of the electric railing, the front windshield of the rear car (OBU installation position) will not enter the communication area, then the communication area may be very short. For some vehicles, This area is not enough to wake up the OBU to complete the transaction. Raise the railing, and the vehicles can only pass at a slow speed, which reduces the traffic efficiency of the ETC lane.

[0005] (3) The effective communication area is affected by various factors such as the installation angle of the OBU, the shielding of the OBU by the front windshield of the vehicle, the sensitivity of the OBU, and the remaining power. The limitation of the length of the communication area alone cannot meet the rapid passage needs of all vehicles.

[0006] In addition, the car model is an important basis for vehicle charging, and the current ETC system only relies on the car model stored in the OBU to determine the car model, because no one intervenes when the ETC system is running normally. It is difficult to be found, which will bring great losses to the expressway operator

[0007] The existing ETC system relies on the buried electromagnetic induction coil to judge the average passing speed of the vehicle. When the vehicle is intercepted, if the vehicle is not pressed against more than two electromagnetic induction coils, it is impossible to calculate the vehicle speed, let alone calculate the effective speed of the vehicle. The speed of the vehicle in the communication area, when a user complains about being blocked, it is impossible to know the exact reason

It is also difficult to track vehicles reversing or turning to other lanes using electromagnetic induction coils, so it is impossible to count the success rate of vehicle transactions in ETC lanes

[0008] Due to individual differences, some OBUs are too sensitive, so that transactions can be completed when they are far away from the railings. It is easy for a single vehicle to interfere with the vehicle, but the exact location of the vehicle cannot be known in the existing ETC system. making it difficult to tune the system

[0009] Now there is an ETC system that embeds multiple electromagnetic induction coils in the lane to divide the lane into multiple communication areas, but some road sections do not have the conditions to embed electromagnetic induction coils, and embedding coils in other road sections needs to damage the road surface, which cannot be done after embedding Adjusting the position requires re-cutting during road construction, the maintenance workload is heavy, and it is difficult to accurately determine the specific position and driving direction of each vehicle

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