DETERIORATION DIAGNOSTIC APPARATUS AND METHOD

摘要

An objective of the present invention is to determine the abnormality of a heater more easily and more quickly. Piecewise linear approximation is performed on the heater characteristic of a heater (111) at a normal time to create a reference line and set an allowable range for determination from the created reference line. The set allowable range is stored in a reference storage part (101). A current measuring part (103) measures a current supplied to the heater (111) according to a control value acquired by a control value acquiring part (102). A deterioration determination part (104) determines the deterioration of the heater (111) when a measured value acquired by the current measuring part (103) exceeds the allowable range.