Abstract: An air conditioning control device includes: an operation pattern acquiring unit to acquire operation patterns indicating an operation target air conditioner in a room; a temperature data acquiring unit to acquire temperature data indicating a temperature measured by a temperature sensor when the air conditioner is in operation: a prediction model generating unit to generate, using a control amount of the air conditioner and temperature data acquired when the air conditioner is in operation as training data, a room-temperature prediction model for predicting the temperature measured by the temperature sensor when the air conditioner are in operation; and an operation pattern selecting unit to provide the control amount of the air conditioner to the room-temperature prediction model to acquire a prediction temperature from each of the room-temperature prediction models, and selects one operation pattern from the operation patterns on the basis of the prediction temperature.

Abstract: An apparatus for detecting a purification factor of a catalyst for purifying an exhaust gas of an internal combustion engine comprises a catalyst disposed in an exhaust system of the internal combustion engine for purifying an exhaust gas, first and second air-fuel ratio sensors disposed upstream and downstream of the catalyst for detecting air-fuel ratios, respectively, a response delay time difference detecting device for detecting differences in response delay time between the first and second air-fuel ratio sensors in respective different operation states of the engine, a purification factor detecting device for detecting a purification factor of the catalyst on the basis of a deviation between the first and second response delay time differences detected in respective different operation states of the engine.

Abstract: According to the present invention, in a system wherein O.sub.2 sensors are disposed on upstream and downstream sides, respectively, of a catalytic converter, and an air-fuel ratio coefficient for the amount of fuel to be injected is determined on the basis of an output of the upstream-side O.sub.2 sensor, the deterioration of the upstream-side O.sub.2 sensor. More particularly, a delay is added to the output of the upstream-side O.sub.2 sensor in accordance with an output signal provided from the downstream-side O.sub.2 sensor, then an air-fuel ratio F/B control is performed in accordance with the delayed output, and when the F/B control period has become longer than a predetermined value, it is judged that the upstream-side O.sub.2 is deteriorated. As a result, not only the deterioration of response characteristic but also the deterioration caused by the Z characteristic center can be detected because it appears as a change of the F/B control period.

Abstract: An apparatus for judging of a catalyst of a catalytic converter provided in an exhaust system of an internal combustion engine so as to purify an exhaust gas generated from the internal combustion engine. The apparatus is arranged to be responsive to the output signal of a gas concentration sensor provided downstream of the converter to detect a concentration of a specified component of the exhaust gas. Included in the apparatus is a judgment unit responsive to the output signal therefrom so as to judge the catalyst of the catalytic converter on the basis of the output signal therefrom. The judgment unit compares a predetermined judgment threshold with an amplitude of the output signal therefrom to detect, on the basis of the comparison result, whether the catalyst of the converter is in a deteriorated state.