| 摘要 |
PROBLEM TO BE SOLVED: To reduce an arithmetic load in an electronic controller for dealing the same data constituted of two formats, that is, a fixed point format and a floating point format. SOLUTION: A microcomputer 11 in an engine control ECU 10 is provided with a CPU 12, an RAM 13, an ROM 14, an FPU(floating point arithmetic processor) 15, and an I/O 16. The FPU 15 executes an arithmetic operation in a floating point format, and the CPU 12 executes an arithmetic operation in a format other than the floating point format. The RAM 13 is provided with a storage area for storing fixed point type hot water data, intake air content data, and number of rotation data and a storage area for storing floating point type hot water data, intake air content data, and number of rotation data. The CPU 12 calculates the floating point type data based on a sensor detection value, and converts the floating point type data into the fixed point type data, and stores each data in the RAM 13. Also, the CPU 12 refers to the floating point type data from the storage area of the floating point type data as necessary. |
