Abstract: An energization control apparatus (30) includes an FET (32), a thermistor (34) and anomaly detection means (36). The anomaly detection means (36) includes temperature-difference calculation means (45) and sensitivity anomaly determination means (41). The temperature-difference calculation means (45) acquires a first temperature measured by the thermistor (34) before startup of a vehicle or within a fixed period after the startup, acquires a second temperature measured by the thermistor (34) at the time when a predetermined wait time has elapsed from the time of acquisition of the first temperature, and calculates the difference therebetween. The sensitivity anomaly determination means (41) determines, from the difference, an anomaly of the thermistor (34) associated with its sensitivity to a temperature to be measured.

Abstract: An energization control apparatus (30) includes an FET (32), a thermistor (34) and anomaly detection means (36). The anomaly detection means (36) includes temperature-difference calculation means (45) and sensitivity anomaly determination means (41). The temperature-difference calculation means (45) acquires a first temperature measured by the thermistor (34) before startup of a vehicle or within a fixed period after the startup, acquires a second temperature measured by the thermistor (34) at the time when a predetermined wait time has elapsed from the time of acquisition of the first temperature, and calculates the difference therebetween. The sensitivity anomaly determination means (41) determines, from the difference, an anomaly of the thermistor (34) associated with its sensitivity to a temperature to be measured.

Abstract: A gas sensor diagnostic method includes: a fuel supply detecting step of detecting an interruption of a fuel supply to the internal combustion engine, and a restart of the fuel supply after the interruption of the fuel supply; a response time period accumulating step of determining a response time period by accumulating a first time period that the sensor output value reaches from a first threshold value to a second threshold value after the detection of the interruption of the fuel supply, and a second time period that the sensor output value reaches from a third threshold value to a fourth threshold value after the detection of the restart of the fuel supply after the interruption of the fuel supply; and an abnormal state diagnosing section of determining an abnormal state of the gas sensor when the response time period is greater than a predetermined time period.

Abstract: A deterioration signal generation device for a gas sensor for simulating a deterioration signal output by a gas sensor in a deteriorated state, the gas sensor detecting the fuel-air ratio of exhaust gas from an internal combustion engine based on the concentration of particular components in the exhaust gas, the deterioration signal generation device including a reference signal acquisition unit as defined herein, a reference signal storing unit as defined herein, a delay time setting unit as defined herein and a signal delay generation unit as defined herein.

Abstract: A gas sensor diagnostic method includes: a fuel supply detecting step of detecting an interruption of a fuel supply to the internal combustion engine, and a restart of the fuel supply after the interruption of the fuel supply; a response time period accumulating step of determining a response time period by accumulating a first time period that the sensor output value reaches from a first threshold value to a second threshold value after the detection of the interruption of the fuel supply, and a second time period that the sensor output value reaches from a third threshold value to a fourth threshold value after the detection of the restart of the fuel supply after the interruption of the fuel supply; and an abnormal state diagnosing section of determining an abnormal state of the gas sensor when the response time period is greater than a predetermined time period.

Abstract: A deterioration signal generation device for a gas sensor for simulating a deterioration signal output by a gas sensor in a deteriorated state, the gas sensor detecting the fuel-air ratio of exhaust gas from an internal combustion engine based on the concentration of particular components in the exhaust gas, the deterioration signal generation device including a reference signal acquisition unit as defined herein, a reference signal storing unit as defined herein, a delay time setting unit as defined herein and a signal delay generation unit as defined herein.