FAULT DIAGNOSING DEVICE FOR MOBILE FARM MACHINE WITH AUTOMATIC CONTROL MECHANISM

摘要

PURPOSE:To ensure an accurate diagnosis for a fault of a farm machine, by storing previously the pseudo detecting signal and the proper answer signal to discriminate the propriety of the working of the farm machine in comparison with those stored signals and at the same time by rejecting an accidental fault due to the noises to recognize only the faults having high occurring frequency or the continuing faults. CONSTITUTION:A diagnosing device 60 is provided with a CPU61, a memory 62 and a display mechanism 63. The device 60 feeds the pseudo signal to a microcomputer 1 and stores the answer output of the signal to discriminate the presence or absence of a fault from the comparison with the proper output. Then the checking is repeated for each item, and the presence or absence of a fault is stored. The occurring frequencies of faults are counted, and a genuine fault is decided and displayed in case when the occurring frequency exceeds a prescribed level. In this case, an accidental fault due to the signal noise is not discriminated nor displayed. A fault which continuous longer than a prescribed duration is also discriminated and displayed in the same way.