Diagnostic method and diagnostic device for gas flow control valve of internal combustion engine
OwnerNaoki MATSUDAinventor
Life of this patent
Estimating the term…
Abstract
A TCV function diagnosis and rationality diagnosis are repeatedly performed during normal operation, and the CSERS diagnosis is performed with the condition that the engine is in a cold state. The time required for the TCV function diagnosis is approximately the same as that for the rationality diagnosis, and each of the diagnoses is completed at time t3. The time required for the CSERS diagnosis set to be shorter such that the completion of the CSERS diagnosis is before the completion of the TCV function diagnosis and rationality diagnosis, and the CSERS diagnosis is completed at time t2.
Claims6
A method for diagnosing a gas flow control valve of an internal combustion engine, wherein the gas flow control valve is disposed on an upstream side of an intake port for variably controlling gas flow within a cylinder, the method comprising:
- comparing a target opening degree as a control target with an actual opening degree of the gas flow control valve that is detected by a sensor, during an operation of the internal combustion engine,
- wherein the diagnosis comprises:
- a first diagnosis performed regardless of whether the internal combustion engine is in a warm-up state or cold state, and performed to command a fail-safe control including fixing of an opening degree of the gas flow control valve when an abnormality is determined;
- and
- a second diagnosis for which completion is required by law, and that is performed under the cold state, and
- wherein a diagnostic processing time and a diagnosis start timing for each of the first and second diagnoses are set such that the completion of the second diagnosis is before completion of the first diagnosis, when the first diagnosis and the second diagnosis are performed in parallel under the cold state.
A device for diagnosing a gas flow control valve of an internal combustion engine, wherein the gas flow control valve is disposed on an upstream side of an intake port for variably controlling gas flow within a cylinder, the device comprising:
- an engine controller configured to perform the diagnosis by comparing a target opening degree as a control target with an actual opening degree of the gas flow control valve that is detected by a sensor, during an operation of the internal combustion engine,
- wherein the diagnosis comprises:
- a first diagnosis performed regardless of whether the internal combustion engine is in a warm-up state or cold state, and performed to command a fail-safe control including fixing of an opening degree of the gas flow control valve when an abnormality is determined;
- and
- a second diagnosis for which completion is required by law, and that is performed under the cold state, and
- wherein a diagnostic processing time and a diagnosis start timing for each of the first and second diagnoses are set such that the completion of the second diagnosis is before completion of the first diagnosis, when the first diagnosis and the second diagnosis are performed in parallel under the cold state.
Dependencies are inferred from the claim text.