| 摘要 |
A method for on-board diagnosis of an oil control valve for a CDA(Cylinder De-Activation) engine of a vehicle is provided to achieve improved fuel efficiency by quickly judging and repairing faults of the oil control valve. A method for on-board diagnosis of an oil control valve for a CDA engine comprises a step of calculating the difference between the pressure value of an intake manifold modeled from the measurement value of an air flow sensor and the actual pressure value of the intake manifold measured by a manifold pressure sensor; a step of determining as faults of the oil control valve and comparing lambda values of both banks for selecting a cylinder with faults, if the difference is larger than a threshold value; a step of converting the engine into a full engine mode when the tank with a lean lambda value is detected; a step of performing CDA control on all cylinders of tanks with faults of oil control valve, and easily detecting the cylinder with faults of oil control valve; and a step of storing error codes, and turning on an engine check lamp.
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