METHOD FOR PREVENTING TRIP DATA CLEAR OF VEHICLE

摘要

The present invention relates to a trip data loss prevention method of a vehicle and has a main purpose for providing a method capable of effectively preventing the trip data (the data of a trip computer displayed on a display) of a cluster from being initialized when a low power state is instantaneously generated by the operation of the vehicle or the operation of large electricity load without storing the data in EEPROM. The present invention relates to the trip data loss prevention method in a vehicle cluster comprising: a process of recording the trip data calculated in the micro computer of the trip computer in the clear area of the RAM; a process of moving the previous trip data to a nonvolatile area of the RAM when the new trip data is generated; a process of recording the trip data stored in the nonvolatile area of the microcomputer again by calling the previous trip data stored in the nonvolatile area when the voltage drop is instantaneously generated. [Reference numerals] (AA) START;(BB) Normal operation loop of trip computer;(CC,EE) Return;(DD) Displaying the information of an initial state;(S12) Does battery reset be generated? (low power apply?);(S13) Recording the occurred trip data (trip variable) on a clear area and displaying information;(S13') Initializing trip data, stored in a clear area, and a check-sum value (Cleared);(S14) Calculating a check-sum value from the occurred trip data;(S14') Recalculating a check-sum value from trip data stored in a back-up area;(S15) Recording the calculated check-sum value in a clear area;(S15') Recalculated check-sum value = stored check-sum value?;(S16) Does the change of a check-sum value be generated?;(S16') Recording trip data stored in a back-up area in a clear area by calling the trip data;(S17) Storing trip data stored in a clear area by moving the trip data to a nonvolatile area;(S17') Displaying the trip data information of a clear area