基于Watch-dog的嵌入式煤层注水多级保护系统设计

Design of Coal Seam Water Infusion Multi-level Embedded Protection System Based on Watchdog

针对现有煤层注水自动控制系统因抗干扰能力有限,无法在部分条件恶劣的采区长时间稳定工作的实际情况,设计了采用多级看门狗组成的嵌入式保护系统。本系统提供了四个级别的保护措施,根据故障严重程度,保护级别逐步升级,在控制系统出现软硬件故障后,包括出现电磁干扰或死锁现象后,不同看门狗启动不同保护措施,使系统恢复正常。在保护系统电路设计中充分考虑了看门狗定时器的独立性、故障安全性和作用实时性三方面因素,各级看门狗用最少的软件及硬件实现,降低了系统冗余。本设计在多个注水自动控制系统的改造实践中应用,有效地提高了原系统的稳定性、可靠性,具有很强的应用和推广价值。

In view that the existing automatic control system for coal seam water infusion can not work stably for a long time in some conditions of the mining area because of its limited anti-interference ability, a embedded protection system composed of multi-level watchdogs is designed. A four-tier protection measure is provided by the system. The level of protection is escalated according to the severity of failures. When the control system hardware and software failures occur,different watchdogs start different protection measures to make the system return to normal, including electromagnetic interference or deadlock. In circuit design of the protection system, the following three factors are taken full account：the independence of watchdog timers, the fail-safe feature and the real-time feature, use the watchdogs at all levels with a minimum of soft wares and hard wares in order to reduce system redundancy. Being applied to a number of water infusion automatic control systems, The stability and reliability of the original systems have been effectively improved to be with high value of application and promotion.