Method of detecting abnormality in crank angle signal of internal combustion engines
This patent describes a method of detecting an abnormality in a crank angle signal of an internal combustion engine having a crankshaft, the abnormality being such that a pulse of the crank angle signal is missing or that a redundant pulse is superimposed on the crank angle signal, comprising the steps of: monitoring the condition of a first reference position signal generated at a predetermined crank angle position of the crankshaft and the condition of a second position signal generated whenever the crankshaft rotates through a predetermined rotational angle; setting a first flat to a predetermined logical state if the first reference position signal is generated before the second position signal is generated a predetermined number of times after generation of the first reference position signal; setting a second flat to a predetermined logical state if the first reference position signal is not generated after the second position signal has been generated the predetermined number of times after generation of the first reference position signal and before an immediately succeeding generation of the second position signal; determining which of a plurality of predetermined combinations of logical states corresponds to a combination of logical states exhibited by the first and second flags; detecting an abnormality in one of the first reference position signal and second position signal based on the determined combination of logical states, the abnormality being such that a pulse of the first reference signal or the second position signal is missing or that a redundant pulse is superimposed on the first reference position signal or the second position signal.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4788956
- OSTI ID:
- 6364946
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330100* -- Internal Combustion Engines
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
ENGINES
HEAT ENGINES
INCIDENCE ANGLE
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MEASURING INSTRUMENTS
METERING
METERS
OPERATION
SHAFTS
SIGNAL CONDITIONING