Mazda Motor Corporation

Yoshitaka Tanikawa

Nobuhiro Hayama

Takeshi Yoshimura

Kazunori Tominaga

An exhaust purifying system for an automobile engine including an exhaust system for the emission of exhaust gases to the atmosphere through a catalytic converter. The system comprises a temperature detector for detecting a signal indicative of the temperature of the catalyst, a total engine operating hour detector for detecting a signal indicative of the total operating hour over which the engine has been operated, a spark timing control for retarding the spark timing when the temperature detector detects that the catalyst temperature is lower than a predetermined value, and a retard time corrector for increasing the amount of control to be performed by the spark timing control with increase within a predetermined range detected by the total engine operating hour detector.

Automobile exhaust purifying system

An internal combustion engine has an intake system provided with a valve for controlling the intake air flow in an idling operation. There is provided a control system including an engine speed detector and a control circuit which compares the engine speed signal from the engine speed detector with a reference value corresponding to a desired idling speed to produce a feedback signal for adjusting the valve. There is also provided an external load detector for producing a modifying signal when an external load is applied to the engine in the idling operation. The control system functions to interrupt the feedback control under the feedback signal for a predetermined time when the external load is applied or removed so as to stabilize the engine speed in a transient period.

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Higashihiroshima, Japan

Yoshitaka Tanikawa