| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain sensor signal data at an accurate timing synchronous to a crank angle from the data converted to digital data in processing the sensor signals. <P>SOLUTION: The sensor signal of CPS2 is converted to a digital signal in an AD conversion circuit 7 via an input circuit 4 to remove noises by a digital filter 8. The data of RAMa are moved to RAMb whenever the signal is converted into AD to store the AD converted data in the RAMa of RAM9. A sensor signal processing device 1 processes the signals in a time span shorter than in a sampling cycle. A trigger generation circuit 11 synchronizes with the crank angle from an NE sensor 3 and creates a trigger signal offset in the delay time of the filter. The data synchronized with the timing of the trigger signal are linearly interpolated and calculated from the AD converted data before and after the time when the trigger signal is generated. Amount of stored data is minimized to have an inexpensive structure for obtaining quick and accurate data. <P>COPYRIGHT: (C)2013,JPO&INPIT |
