Watchdog circuit in on-board unit and on-board unit
A vehicle-mounted device and watchdog technology, which is applied in the field of watchdog circuits, can solve the problems of high power consumption, complex design, and high cost, and achieve the effects of stable timing function, simple design, and low cost
Active Publication Date: 2013-05-22
CHINA TRANSINFO TECH CORP
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Problems solved by technology
[0004] However, the watchdog circuit shares the power supply and clock source of the OBU with the microprocessor. In this way, when the power supply is unstable, or when the microprocessor fails to work normally and the clock source is unstable due to an abnormal situation, the watchdog circuit The function of the circuit is likely to fail
[0005] Although an external general-purpose watchdog circuit in the form of a dedicated watchdog integrated circuit and a counter can provide a stable watchdog circuit function, due to its complex design, high cost, and high power consumption, it is difficult to , cannot meet the hardware cost and power consumption requirements of the disposable battery-powered OBU
Method used
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[0044] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0045] refer to figure 1 , which shows a structural diagram of a watchdog circuit embodiment in a vehicle-mounted device of the present invention, which is located outside the microprocessor, and may specifically include:
[0046] The timing circuit 101 may specifically include:
[0047] The first RC charging and discharging circuit 111 is connected to the power supply; and
[0048] Start enabling terminal 112, which is respectively connected to the first RC charging and discharging circuit 111 and the control pin of the microprocessor; and
[0049] The reset circuit 102 may specifically include:
[0050] A second resistance-capacitance charging and discharging circuit 121, which is connected to the timing circuit 101 and the p...
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The invention provides a watchdog circuit in an on-board unit and the on-board unit. The watchdog circuit is positioned outside a microprocessor and comprises a timing circuit and a reset circuit. The timing circuit comprises a first resistance-capacitance charge and discharge circuit and a start enabling terminal, wherein the first resistance-capacitance charge and discharge circuit is connectedwith a power supply; and the start enabling terminal is connected with the first resistance-capacitance charge and discharge circuit and a control pin of the microprocessor. The reset circuit comprises a second resistance-capacitance charge and discharge circuit and a reset output end, wherein the second resistance-capacitance charge and discharge circuit is connected with the timing circuit and the power supply; and the reset output end is connected with a reset pin of the microprocessor. When the start enabling terminal has a low level, the first resistance-capacitance charge and discharge circuit generates a timing time; when the timing time is up, if the microprocessor is not abnormal, the start enabling terminal is set to have a high level; otherwise, if the microprocessor is abnormal, the second resistance-capacitance charge and discharge circuit generates a low-level reset signal. The watchdog circuit stably works, is low in power consumption and low in cost and can meet the requirements of the on-board unit (OBU).
Description
technical field [0001] The invention relates to the technical field of vehicle equipment, in particular to a watchdog circuit in the vehicle equipment and a vehicle equipment. Background technique [0002] At present, in order to achieve intelligent, real-time, and dynamic management of vehicles, a communication protocol suitable for roads and vehicles in the field of intelligent transportation has been specially developed internationally, that is, Dedicated Short Range Communication (DSRC, Dedicated Short Range Communication) protocol. DSRC system is a wireless communication system that organically connects vehicles and roads through two-way transmission of information. It mainly includes three parts: on-board equipment (OBU, On-Board Unit), roadside equipment, and DSRC protocol. [0003] In order to improve the working reliability of the OBU, most OBUs will integrate a built-in watchdog circuit inside the microprocessor. The function of the watchdog circuit is to make the ...
Claims
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IPC IPC(8): G06F11/00
Inventor 刘起昌赵志泳周双全张志平夏曙东
Owner CHINA TRANSINFO TECH CORP