Ngk Spark Plug Company, Limited

Niterra Co., Ltd.

Ryosuke Ichida

Yoshinori Hibino

Kentaro Mori

Soichi Kawaguchi

Tsuyoshi Kato

A purification controlleris configured to estimate the amount of ammonia occluded (i.e. ammonia occlusion amount) in an SCR catalyst, which is arranged in an exhaust pipeof a diesel engineso as to purify NOx in an exhaust gas of the diesel engine. More specifically, the purification controlleracquires upstream NO concentration data, upstream NOconcentration data, downstream NOx concentration data, downstream NOconcentration data and downstream ammonia concentration data. The purification controllerfurther acquires an urea injection amount. Then, the purification controllerestimates the ammonia occlusion amount based on the acquired upstream NO concentration data, upstream NOconcentration data, downstream NOx concentration data, downstream NOconcentration data and downstream ammonia concentration data, the acquired urea injection amount and reaction formulas for reduction of NOx with the SCR catalyst

Ammonia occlusion amount estimation device and method, and purification control apparatus and method

An oxygen sensor controlling apparatus includes: a controller configured to obtain a degradation index of a detection element; obtain a sensor output; detect an internal resistance of the detection element by causing a temporary change between electrodes of the detection element; successively obtain a target resistance value corresponding to the internal resistance using a first sensor output that is a value of the sensor output obtained at a time before or after a period when the temporary change occurs and the degradation index; and feedback control energization of the heater so that the internal resistance becomes the target resistance value.

Oxygen sensor controlling apparatus, oxygen sensor controlling method and computer readable recording medium

A gas sensor processing apparatus () which includes voltage shift means (, S) for shifting a detection element voltage VE produced between electrodes (P,N) of a detection element () from a pre-shift voltage VEto a post-shift voltage VErecovery means (, S) for returning the detection element voltage VE from the post-shift voltage VEto the pre-shift voltage VEafter the end of a voltage shift period TS in which the voltage VE is shifted by the voltage shift means; and deterioration index detection means S-Sfor detecting a deterioration index ID representing the degree of deterioration of the detection element () on the basis of a voltage change in the recovery period TK in which the voltage VE is recovered by the recovery means.

Gas sensor processing apparatus

When a detection signal obtained from the cell of a gas sensor (S) has reached a start determination value (specifically, when the output voltage of the cell is higher than 600 mV (S: YES) or lower than 300 mV (S: YES)), a pulse voltage is applied to the cell (S), and a start-time internal resistance is obtained on the basis of the detection signal having changed as a result of application of the pulse voltage (S). The start-time internal resistance is compared with a deterioration determination value set in advance (S). A target resistance of the cell used in temperature control (energization control) for the heater is corrected in accordance with the result of the comparison (S). Thus, the temperature of the cell can be stably maintained constant irrespective of deterioration of the cell.

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Komaki, Japan

Ryosuke Ichida