公开(公告)号：US20020048736A1

公开(公告)日：2002-04-25

申请号：US09906852

申请日：2001-07-18

申请人： RB Controls Co., Ltd.

发明人： Hajime Kawauchi ,  Toshihisa Terade

IPC分类号： F23N005/00 ,  F23Q023/00 ,  F23N001/00

CPC分类号： F23N5/242 ,  F23N2023/08 ,  F23N2027/16 ,  F23N2031/10 ,  F23N2035/14

摘要： A conventional watchdog timer circuit is arranged to judge a microcomputer to be normal as long as a pulse signal is being outputted from the microcomputer. Therefore, an abnormal condition cannot be detected when an operating frequency of the microcomputer lowers, for example. As a solution, the watchdog timer circuit is provided with a function for detecting the frequency. If the frequency of the pulse signal deviates from a predetermined frequency range, a reset signal is outputted indicating that the microcomputer is abnormal, even if the pulse signal is being outputted. A solenoid-operated gate valve is thereby closed to stop the supply of gas to a gas burner.

摘要翻译： 只要从微计算机输出脉冲信号，就设置常规的看门狗定时器电路来判断微机是正常的。 因此，例如，当微型计算机的工作频率降低时，不能检测出异常状况。 作为解决方案，看门狗定时器电路具有用于检测频率的功能。 如果脉冲信号的频率偏离预定的频率范围，即使输出脉冲信号，也输出表示微机异常的复位信号。 因此，电磁操作的闸阀被关闭以停止向气体燃烧器供应气体。

公开(公告)号：US20020045143A1

公开(公告)日：2002-04-18

申请号：US09906699

申请日：2001-07-18

申请人： RB Controls Co., Ltd.

发明人： Hajime Kawauchi ,  Toshihisa Terade

IPC分类号： F23N001/00 ,  F23N005/00

CPC分类号： F23N5/242 ,  F23N2023/04 ,  F23N2023/08 ,  F23N2031/02 ,  F23N2031/04 ,  F23N2035/14

摘要： When an error occurs to a combustion device, a microcomputer inside a control apparatus for the combustion device closes a safety valve thereby stopping gas supply to a gas burner. In a conventional control apparatus, when a power source resetting is actuated with a power switch, the safety valve is opened to supply the gas burner with gas even though the cause for the error has not been resolved. As a solution, when an error occurs, the fact of such an occurrence is stored in a nonvolatile memory, i.e., electrically erasable programmable read-only memory, EEPROM. It is so arranged that, unless the reset switch is operated, the memory in the EEPROM is not reset. After resetting, the memory in the EEPROM is read out. As long as the reset has not been made, the safety valve is not opened, but the program immediately proceeds to a state in which the operation of the reset switch is held in suspension.