Diagnostic method and system for a manifold air pressure sensor
AssigneeHyundai Motor Company
InventorJae-Hyung Lee
Life of this patent
Estimating the term…
Abstract
A MAP (Manifold Air Pressure) sensor diagnostic method for a vehicle is provided which uses a calculated intake manifold air pressure as the intake manifold air pressure if the output signal of the MAP sensor is not within a predetermined range, or if the difference between the intake manifold air pressure indicated by the MAP sensor signal and the calculated intake manifold air pressure is not less than a predetermined value.
Claims22
A manifold air pressure (MAP) sensor diagnostic method, comprising:
- determining whether a MAP sensor signal is within a predetermined range;
- calculating an intake manifold air pressure based on one or more engine operating parameters;
- determining whether a difference between a sensed intake manifold air pressure indicated by the MAP sensor signal and the calculated intake manifold air pressure is less than a predetermined value, if it is determined that the MAP sensor signal is within the predetermined range;
- and
- selecting the calculated intake manifold air pressure as an actual intake manifold air pressure if the MAP sensor signal is not within the predetermined range, or if the difference between the sensed intake manifold air pressure and the calculated intake manifold air pressure is not less than the predetermined value.
A manifold air pressure (MAP) sensor diagnostic system, comprising:
- a MAP sensor detecting an intake manifold air pressure and generating a signal indicative of the detected pressure;
- and
- a control unit diagnosing malfunctions of the MAP sensor based on one or more engine operating parameters and the MAP sensor signal, the control unit being programmed to perform a control method comprising:
- determining whether a MAP sensor signal is within a predetermined range;
- calculating an intake manifold air pressure based on one or more engine operating parameters;
- determining whether a difference between a sensed intake manifold air pressure indicated by the MAP sensor signal and the calculated intake manifold air pressure is less than a predetermined value, if it is determined that the MAP sensor signal is within the predetermined range;
- and
- selecting the calculated intake manifold air pressure as an actual intake manifold air pressure if the MAP sensor signal is not within the predetermined range, or if the difference between the sensed intake manifold air pressure and the calculated intake manifold air pressure is not less than the predetermined value.
A diagnostic method for a manifold air pressure (MAP) sensor, comprising:
- determining that a MAP sensor signal is within a predetermined range;
- calculating an adjusted intake manifold air pressure without using the MAP sensor signal;
- converting the MAP sensor signal to a sensed intake manifold air pressure;
- determining an absolute difference between the sensed intake manifold air pressure and the adjusted intake manifold air pressure;
- and,
- concluding that the MAP sensor is operating abnormally, if the absolute difference is more than a threshold value.
Dependencies are inferred from the claim text.