Patent ID: 11919505
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 7:
8. A control device of a hybrid electric vehicle applied to a hybrid electric vehicle having an internal combustion engine and an electric motor capable of rotating an output shaft of the internal combustion engine, the internal combustion engine including an air-fuel ratio sensor that detects an air-fuel ratio of exhaust gas, a filter that collects fine particulate matter in the exhaust gas, a first pressure sensor that detects a pressure of the exhaust gas on an upstream side of the filter, and a second pressure sensor that detects a pressure of the exhaust gas on a downstream side of the filter,
wherein the control device is programmed to execute:
a motoring process of rotating the output shaft of the internal combustion engine by the electric motor in a state where fuel supply to cylinders of the internal combustion engine is stopped;
a first diagnosis process of, when first execution conditions including that there is no output demand for the internal combustion engine are met, diagnosing whether the air-fuel ratio sensor has an abnormality based on a detection signal of the air-fuel ratio sensor while executing the motoring process;
a second diagnosis process of, when second execution conditions including that there is no output demand for the internal combustion engine and including that a pressure of the exhaust gas is equal to or higher than a specified pressure or a flow rate of the exhaust gas is equal to or higher than a specified flow rate are met, diagnosing whether the filter has an abnormality based on at least one of a difference between the pressure of the exhaust gas on the upstream side of the filter and the pressure of the exhaust gas on the downstream side of the filter, a difference between a flow rate of the exhaust gas on the upstream side of the filter and a flow rate of the exhaust gas on the downstream side of the filter, a difference between a pressure change amount of the exhaust gas on the upstream side of the filter and a pressure change amount of the exhaust gas on the downstream side of the filter, or a difference between a flow rate change amount of the exhaust gas on the upstream side of the filter and a flow rate change amount of the exhaust gas on the downstream side of the filter while executing the motoring process; and

an execution determination process of prohibiting execution of both the first diagnosis process and the second diagnosis process when at least either the first execution conditions or the second execution conditions are not met, and executing both the first diagnosis process and the second diagnosis process when both the first execution conditions and the second execution conditions are met.