Measuring and testing – Test stand – For engine
Patent
1991-02-04
1992-03-17
Raevis, Robert
Measuring and testing
Test stand
For engine
G01L 326
Patent
active
050957422
ABSTRACT:
A method and apparatus are provided for reliably detecting misfires in an internal combustion engine during actual driving conditions by monitoring fluctuations in engine speed between consecutive firing intervals. An average acceleration over a series of firing intervals is removed from an individual acceleration measurement corresponding to a particular firing interval to give an acceleration deviation which is then normalized to an expected torque to provide a power loss measurement. The power loss measurement indicates the occurrence of a misfire with a high signal-to-noise ratio. The information derived from misfire detection can be used to prevent destruction of a catalytic converter by unburned fuel mixtures and can be used to improve vehicle driveability by correcting for or indicating needed service for the vehicle. The misfire detection is implemented using existing sensors and processors and is adapted to be done on-board a vehicle in real time.
REFERENCES:
patent: 4295363 (1981-10-01), Buck et al.
patent: 4301678 (1981-11-01), Full et al.
patent: 4539956 (1985-09-01), Hengel et al.
patent: 4584906 (1986-04-01), Nagaoka et al.
Dosdall James M.
James John V.
Marko Kenneth A.
Ford Motor Company
May Roger L.
Mollon Mark
Raevis Robert
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