Patent ID: 7464538

Claim:
An exhaust gas purifying apparatus which purifies exhaust gas of an internal combustion engine, the exhaust gas purifying apparatus comprising: a pair of discharge electrodes which applies voltage to exhaust gas; voltage control means for controlling a waveform of voltage supplied to the pair of discharge electrodes; and detection means for detecting a load on an internal combustion engine, an exhaust gas flow rate, and purification reaction efficiency, wherein a waveform of the voltage has a burst period that is repeatedly performed, the burst period includes a discharge period and an undischarged period subsequent to the discharge period, a predetermined basic waveform periodically existing in a repeated manner in the discharge period, the predetermined basic waveform being not included and a discharge voltage being zero in the undischarged period, and the voltage control means responds to output of the detection means to adjust an amplitude, a period, and a continuous iteration count of the basic waveform and a length of the burst period.