To enhance reliability by surely preventing an injection part from being carelessly driven by an abnormal signal such as a noise signal while it is cooled (stopped).
An injection commanding part 21 for intermittently driving an injection part 6 is equipped with a measurement start detecting means 23 to be set at inhibition of detection by detecting the leading edge of a first drive commanding signal conveyed to the injection part 6 via a drive command gate 24 at the early stage of starting and after the end of each cooling period, a first timer means 28 expiring at the end of next cooling period to reset the means 23 at permission of detection, a second timer means 29 expiring at the end of each measurement period to generate a cooling period signal, an abnormal command monitoring means 30 for turning off the gate 24 by detecting an abnormal signal such as a noise signal inputted into the gate 4 while the cooling period signal is on to inhibit the abnormal signal from being supplied to the injection part 6, and an abnormal stoppage informing means 34 for informing a stop of the injection part 6 due to an abnormal input by lighting a lamp, etc.
TSUKAMOTO MASAKAZU
NATSUDA YASUKAZU
SHIKATA TOSHIHIKO
NISSIN ELECTRIC CO LTD