Two-stage wakeup method and two-stage wakeup device applied to ambiguity path recognition system

Abstract

A two-stage wakeup method and a two-stage wakeup device applied to an ambiguity path recognition system are disclosed. The method comprises the following steps: a timed wakeup control module sends a first cycle enable signal to a radio-frequency module; the radio-frequency module receives an external wakeup signal and sends a characterization signal of the external wakeup signal to the timed wakeup control module within the interception time of the first cycle enable signal; when determining that the characterization signal meets a first threshold condition, the timed wakeup control module stops sending the first cycle enable signal, and sends a second cycle enable signal to the radio-frequency module; the radio-frequency module sends the characterization signal of the received external wakeup signal to the timed wakeup control module within the interception time of the second cycle enable signal; and the timed wakeup control module outputs an internal wakeup signal to a system control module when determining that the characterization signal meets a second threshold condition. By adopting the method, the power consumption of the system is reduced greatly. In addition, the device of the invention can achieve all the beneficial effects of the method.

Description

technical field [0001] The invention relates to the field of wake-up of active electronic equipment, in particular to a two-stage wake-up method and device for an ambiguity path identification system. Background technique [0002] The ambiguous path identification system includes RSU (Roadside Sign Unit), CPC (Composite Pass Card), CR (Composite Reader-Writer) and other equipment. In the ambiguous path recognition system, the vehicle receives the CPC when entering the entrance lane of the closed toll road. When the vehicle passes the RSU, it receives and stores the path identification information sent by the RSU through the CPC, and reads it through the CR when entering the exit lane. The entry information and path information stored in the CPC are charged and billed. Since the system requires two-way security authentication between RSU and CPC, it requires two-way communication between the two. [0003] In the ambiguous path recognition system, when the vehicle carrying t...

AI Technical Summary

Problems solved by technology

Since the vehicle may still be in the one-way communication area at this time, making the CPC enter the working mode prematurely but unable to perform two-way communication will undoubtedly cause a great waste of system power consumption

In addition, because the speed of the vehicle is uncontrollable when driving in the one-way communication area, for example, a traffic jam or a traffic accident will cause the vehicle to slow down or even stop. At this time, the wake-up module of the CPC is frequently in the working mode, which will further cause power consumption. Great waste

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