Check method of temporary storage circuit in electronic control unit
AssigneesAutonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorYoshitaka Sumida
Life of this patent
Estimating the term…
Abstract
Data in a RAM indicated by a top address is read, the read contents are written into the next address, and the operation is repeated to an end address, then the RAM value at the end address is compared with the RAM value at the top address. If the RAM values are the same, all the RAM is determined to be normal. The data comparison processing may include only one comparison with the end address data. Additionally, a ROM may be checked in a distributed manner in the wait time of main processing, rather than being checked in initial processing.
Claims5
A check method of a temporary storage circuit in an electronic control unit for executing an operation check of a temporary storage circuit before the control processing in said electronic control unit wherein a central control unit once stores various data and a software program in said temporary storage circuit and executes predetermined control processing, said check method comprising:
- the first step of predetermined data into the top address of said temporary storage circuit;
- the second step of reading the data at the top address and writing the data into the next address and the later addresses repeatedly in order;
- and
- the third step of comparing the data at the end address with the data at the top address only once after the data is written into the end address at the second step, and
- determining that the read operation and the write operation of the data at all addresses of said temporary storage circuit are normal and on the other hand, if the data at the end address and the data at the top address are the same,
- determining that the read operation and the write operation of said temporary storage circuit are abnormal, if the data at the end address and the data at the top address are not the same.
A check method of a storage circuit in an electronic control unit for executing an operation check of said storage circuit in said electronic control unit wherein a central control unit executes predetermined control processing based on various data and a software program previously stored in said storage circuit,
- said check method comprising:
- the first step of sensing whether or not the predetermined control processing is in a time wait state after predetermined initial processing;
- the second step of executing the predetermined control processing if the fact that the predetermined control processing is not in a time wait state is detected at said first step;
- and
- the third step of checking the storage circuit within the wait time of the predetermined control processing only if the fact that the predetermined control processing is in a time wait state is detected at said first step.
Dependencies are inferred from the claim text.