Apparatus and method for determining a time that a system's main power
was inactive
    1.
    发明授权
    Apparatus and method for determining a time that a system's main power was inactive 失效
    用于确定系统主电源无效的时间的装置和方法

    公开(公告)号:US5410581A

    公开(公告)日:1995-04-25

    申请号:US236850

    申请日:1994-05-02

    CPC分类号: G07C5/04 G01R31/007 G07C3/04

    摘要: An apparatus and method for determining a time that a system's main power was inactive includes a counter circuit (171) for accumulating transitions of a clock signal (149) while the system's main power (117) is inactive. Preferably, another circuit (159, 125) determines a periodicity of the clock signal (149) after the system's main power (117) transitions active. Then a computational circuit, preferably a microcontroller (129), determines the time (183) that the system's main power (117) was inactive dependent on a number of transitions of the clock signal (149) accumulated by the counter circuit (171) when the system's main power (119) was inactive and the determined periodicity of the clock signal (149) after the system's main power (117) transitions active. Preferably, this apparatus and method are used in a vehicle to determine how long a time that an engine is turned off and to modify an engine control strategy dependent on that determined time.

    摘要翻译: 用于确定系统主电源不活动的时间的装置和方法包括:在系统的主电源(117)不活动的同时累积时钟信号(149)的转换的计数器电路(171)。 优选地,另一个电路(159,125)在系统的主电源(117)转换为有效之后确定时钟信号(149)的周期性。 然后,计算电路,优选地是微控制器(129),根据由计数器电路(171)累积的时钟信号(149)的转换次数确定系统主功率(117)无效的时间(183),当时 系统的主电源(119)无效,并且在系统主电源(117)转换为活动后,确定的时钟信号(149)的周期性。 优选地,该装置和方法用于车辆中以确定发动机关闭的时间长短以及依赖于所确定的时间来修改发动机控制策略。