Control method and device of esam, obu

Abstract

The invention provides an ESAM control method and device and an OBU. The method comprises the steps that an OBU controller sends an initialization instruction to an ESAM in advance; the ESAM sets an initialization flag of its own after receiving the initialization instruction; the ESAM judges whether the initialization flag is valid after being energized, and if the initialization flag is valid, the ESAM completes the initialization process of its own. According to the method, the ESAM is adopted to complete initialization operation of its own, and there is no need to adopt the OBU controller to send a series of initialization instructions to the ESAM to conduct initialization operation on the ESAM; the OBU controller can conduct initialization operation on other electronic devices of its own when the ESAM conducts initialization operation, so the time for initialization operation of the OBU is not occupied, the instruction efficiency of the OBU is improved, and the OBU can adapt to an ETC system with a high requirement for the passing speed.

Description

technical field [0001] The invention relates to the field of intelligent transportation, in particular to an ESAM control method and device, and an OBU. Background technique [0002] In the 21st century, the intelligent transportation industry continues to develop rapidly, and the electronic toll collection (Electronic Toll Collection, ETC) system is increasingly widely used. The ETC system includes electronic tags (On Board Unit, OBU), road side units (Road Side Unit, RSU) and moving vehicles. One of the electronic components of the OBU is an Embedded Secure Access Module (ESAM). As a secure storage module, the ESAM is mainly used to store individual information of the OBU, such as vehicle information and transaction records. [0003] In the ETC system, the OBU is placed in the driving vehicle. When the vehicle passes the RSU at high speed, microwave communication is used between the OBU and the RSU erected on the roadside, and combined with the stored information inside t...

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Problems solved by technology

[0004] In the next ETC transaction, the OBU wakes itself up again, and then powers on the ESAM. After the OBU wakes up, a series of initialization processes are required. The initialization process includes: the OBU controller sends a series of initialization commands to the ESAM to initialize the ESAM , but the initialization process of the OBU takes a lot of time, resulting in low efficiency of the subsequent instructions of the OBU

In ETC transactions, the speed of the vehicle is relatively fast, generally above 80km / h. Due to the long initialization process of the OBU, the preparation process before the OBU performs normal operations on the driving vehicle (the process of calculating and charging the vehicle) is too long, resulting in In the ETC system, the calculation rate is slowed down. When the speed of the driving vehicle is too fast, the OBU cannot be applied to the ETC system.

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