Method and system for communication with an engine control module in
sleep mode
    1.
    发明授权
    Method and system for communication with an engine control module in sleep mode 失效
    用于与睡眠模式下的发动机控制模块进行通信的方法和系统

    公开(公告)号:US5999876A

    公开(公告)日:1999-12-07

    申请号:US53582

    申请日:1998-04-01

    IPC分类号: F02D41/04 F02D41/26 F02D45/00

    CPC分类号: F02D41/042 F02D41/263

    摘要: An engine control system for a vehicle engine includes an engine control module (ECM) that enters a modified sleep mode when the vehicle key switch is turned to the "off" position. In the modified sleep mode, all non-essential operating tasks normally executed by the ECM are disabled to place the ECM in a mode of reduced power consumption. In addition, various communications interrupts are disabled, except for interrupts associated with at least one external data transmission device. During the modified sleep mode, priority for communications with the external device are highest to permit external communication to and from the ECM using the external device. In this modified sleep mode, the vehicle operator or engine technician can download or upload data to and from the ECM memory. The ECM includes a sleep mode task module that is maintained during the modified sleep mode. The sleep mode task module controls a sleep mode termination timer (SMT timer) that counts the time the ECM is in the modified sleep mode. The SMT timer is reset for each communication between the ECM and the external device. Upon expiration of the SMT timer, the ECM transfers to a power down mode, after flushing volatile data caches to non-volatile memory.

    摘要翻译: 用于车辆发动机的发动机控制系统包括当车辆钥匙开关转到“关闭”位置时进入修改的睡眠模式的发动机控制模块(ECM)。 在修改后的睡眠模式中,通常由ECM执行的所有非必需操作任务都被禁用,以使ECM处于降低功耗的模式。 此外,除了与至少一个外部数据传输设备相关联的中断之外,各种通信中断被禁用。 在修改睡眠模式期间,与外部设备通信的优先级最高,以允许使用外部设备与ECM进行外部通信。 在该修改的睡眠模式中,车辆操作员或引擎技术人员可以向/从ECM存储器下载或上传数据。 ECM包括在修改的休眠模式期间维持的睡眠模式任务模块。 休眠模式任务模块控制睡眠模式终止定时器(SMT定时器),其对ECM处于修改睡眠模式的时间进行计数。 对于ECM和外部设备之间的每个通信,SMT定时器被复位。 在SMT定时器到期后,ECM将易失性数据高速缓存清除到非易失性存储器后,转移到掉电模式。