US 11,939,907 B2
Engine control device
Akihiro Katayama, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Oct. 11, 2022, as Appl. No. 18/045,494.
Claims priority of application No. 2021-206379 (JP), filed on Dec. 20, 2021.
Prior Publication US 2023/0193814 A1, Jun. 22, 2023
Int. Cl. F02B 37/18 (2006.01); B60W 10/06 (2006.01); B60W 10/08 (2006.01); B60W 20/15 (2016.01); F01N 3/20 (2006.01); F01N 13/00 (2010.01); F02D 41/00 (2006.01); F02D 41/14 (2006.01); F02D 41/22 (2006.01)
CPC F02B 37/183 (2013.01) [B60W 10/06 (2013.01); B60W 10/08 (2013.01); B60W 20/15 (2016.01); F01N 3/20 (2013.01); F01N 13/008 (2013.01); F02D 41/0007 (2013.01); F02D 41/1454 (2013.01); F02D 41/221 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An engine control device for controlling an engine including
a combustion chamber in which combustion of fuel-air mixture is performed,
an exhaust passage through which exhaust gas discharged from the combustion chamber flows,
a turbocharger including a turbine provided in the exhaust passage,
a bypass passage branching off from the exhaust passage at a part of the exhaust passage on an upstream side from the turbine and merging the exhaust passage at a part of the exhaust passage on a downstream side from the turbine,
a wastegate valve configured to open and close the bypass passage,
an air-fuel-ratio sensor provided in a part of the exhaust passage on the downstream side from the turbine, and
a catalyzer configured to clean the exhaust gas, the catalyzer being provided in a part of the exhaust passage, the part being on the downstream side from the air-fuel-ratio sensor and on the downstream side from a merging position where the bypass passage merges with the exhaust passage, wherein the engine device executes the followings:
a catalyst early activation control at cold start of the engine such that the catalyzer is promoted to be activated by opening the wastegate valve; and
a diagnosis process of diagnosing whether or not the wastegate valve is stuck closed, based on an amplitude of output fluctuation in the air-fuel-ratio sensor during execution of the catalyst early activation control.