公开(公告)号：US11199148B2

公开(公告)日：2021-12-14

申请号：US17158408

申请日：2021-01-26

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kazuhiro Wakao ,  Keiichiro Aoki ,  Yasutaka Kamiya

IPC: F02D41/14

Abstract: A control device for an exhaust sensor is configured to control the exhaust sensor disposed in an exhaust passage of an internal combustion engine. The control device for an exhaust sensor includes: a sensor element; a heater configured to heat the sensor element; a current detection circuit configured to detect an output current of the exhaust sensor, and an electronic control device configured to control electric power that is supplied to the heater by PWM control.

公开(公告)号：US11319890B2

公开(公告)日：2022-05-03

申请号：US17147754

申请日：2021-01-13

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kazuhiro Wakao ,  Yoshiyuki Kitazume ,  Keiichiro Aoki ,  Yasutaka Kamiya

IPC: F02D41/14 ,  F02D41/12

Abstract: An abnormality detection device for an air-fuel ratio detection device arranged downstream of a filter is equipped with an abnormality detection unit that detects an abnormality in the air-fuel ratio detection device based on output change characteristics of the air-fuel ratio detection device during fuel cutoff control for stopping the supply of fuel to a combustion chamber of an internal combustion engine, and a combustion determination unit that determines whether or not a combustion amount of particulate matter in a filter during fuel cutoff control is larger than a predetermined amount. The abnormality detection unit prohibits detection of an abnormality in the air-fuel ratio detection device when the combustion determination unit determines that the combustion amount is larger than the predetermined amount.

公开(公告)号：US11319889B2

公开(公告)日：2022-05-03

申请号：US17136472

申请日：2020-12-29

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yoshiyuki Kitazume ,  Kazuhiro Wakao ,  Keiichiro Aoki ,  Yasutaka Kamiya

IPC: F02D41/14

Abstract: The abnormality diagnosis system 1 of a downstream side air-fuel ratio detection device 41, 42, comprises an air-fuel ratio control part 71 controlling an air-fuel ratio of an air-fuel mixture, an abnormality judgment part 72 judging abnormality of the downstream side air-fuel ratio detection device based on a characteristic of change of output of the downstream side air-fuel ratio detection device when the air-fuel ratio control part makes the air-fuel ratio of the air-fuel mixture change, and an oxygen change calculation part 73 calculating an amount of change of an oxygen storage amount of the catalyst when the air-fuel ratio control part makes the air-fuel ratio of the air-fuel mixture change. The abnormality judgment part does not judge abnormality of the downstream side air-fuel ratio detection device when the amount of change of the oxygen storage amount is less than a lower limit threshold value.