METHOD FOR MONITORING A WATCH DOG SIGNAL OF A SHIFT CONTROL UNIT WHICH DETERMINES A NORMAL OPERATION OF THE SHIFT CONTROL UNIT BY RECEIVING THE WATCH DOG SIGNAL

摘要

PURPOSE: A method for monitoring a watch dog signal of a shift control unit is provided to reduce signal processing load by distinguishing between right and wrong of process execution of the watch dog signal through signal period decision logic.;CONSTITUTION: An engine control unit receives a watch dog signal from a shift control unit(S1). The shift control unit calculates the elapsed time between first receiver time of the watch dog signal and second receiver time of the watch dog signal(S5). The shift control unit determines whether the elapsed time exceeds reference time or not(S7). The shift control unit practices the logic for determining a normal operation state. The shift control unit is determined to be normally operated when the elapsed time is less than or equal to limit time(S11).;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Start; (BB) End; (S1) Receiving a watch dog signal; (S11) Determining whether a shift control unit is normally operated or not; (S13) Controlling the reset of the shift control unit; (S3) Determining whether a receiving circle of a watch dog signal is established or not; (S5) Calculating elapsed time between reception time of a watch dog signal and reception time of a previous watch dog signal; (S7) Elapsed timeReference time?; (S9) Executing a logic to determine the state of normal operation of a shift control unit