US 12,071,907 B2
Control device for internal combustion engine
Keiichiro Aoki, Shizuoka-ken (JP); and Masato Ikemoto, Shizuoka-ken (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 7, 2023, as Appl. No. 18/366,138.
Claims priority of application No. 2022-171461 (JP), filed on Oct. 26, 2022.
Prior Publication US 2024/0141847 A1, May 2, 2024
Int. Cl. F02D 41/14 (2006.01)
CPC F02D 41/1454 (2013.01) [F02D 41/1495 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A control device for an internal combustion engine, the control device comprising:
a processor, and
a memory storing programs that cause the processor to execute following processes (i) to (iii):
(i) acquiring a sensor output value of an air-fuel ratio sensor installed in an exhaust passage of the internal combustion engine, the air-fuel ratio sensor including an element,
(ii) detecting an air-fuel ratio by calculating an air-fuel ratio detection value based on the sensor output value and a gain, and
(iii) executing a Proportional-Integral-Differential control as an air-fuel ratio feedback control based on the detected air-fuel ratio, wherein
the program further causes the processor to
start the processes (ii) and (iii) in a case where an element temperature of the air-fuel ratio sensor becomes equal to or higher than a predetermined activation temperature, and
calculate the air-fuel ratio detection value during a period from when the processes (ii) and (iii) are started until a predetermined condition is satisfied, by setting the gain to a smaller value than a value of the gain after an elapse of the period, in a case where the sensor output value indicates that an air fuel ratio in the exhaust passage is richer than stoichiometric.