Catalyst early activation control at cold engine start
AssigneeToyota Jidosha Kabushiki Kaisha
InventorAkihiro Katayama
Life of this patent
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Abstract
An ECM executes a catalyst early activation control at cold start of an engine such that the activation of a catalyzer is promoted by opening a WGV. Further, the ECM performs a diagnosis process of, during execution of the catalyst early activation control, repeating opening and closing of the WGV with a given period and diagnosing whether or not the WGV is stuck, based on whether or not a fluctuation component with the same period as the period of the opening and closing of the WGV is included in output from an intake manifold pressure sensor during the repetition.
Claims5
An engine control device for controlling an engine including
- a combustion chamber in which combustion of fuel-air mixture is performed,
- an intake passage as an introduction passage for intake air to the combustion chamber,
- an exhaust passage as a discharge passage for exhaust gas from the combustion chamber,
- a turbocharger including a turbine provided in the exhaust passage and a compressor provided in the intake 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 with 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,
- 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 a merging position where the bypass passage merges with the exhaust passage, and
- an intake pressure sensor configured to detect a pressure of the intake air in a part of the intake passage on the downstream side from the compressor, the engine control device comprising:
- a processor configured to execute
- 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, during execution of the catalyst early activation control, instructing the wastegate valve to repeat opening and closing with a given period and diagnosing whether or not the wastegate valve is stuck, based on whether or not a fluctuation component with the given period is included in output from the intake pressure sensor during the instruction.
Dependencies are inferred from the claim text.