Engine misfire, knock of roughness detection method and apparatu

Details Engine misfire, knock of roughness detection method and apparatu Engine misfire, knock of roughness detection method and apparatu

1991-06-24

1993-12-14

Williams, Hezron E.

Measuring and testing

Test stand

For engine

73DIG2, 73 35, G01L 0112, G01L 0300, G01L 0513, G01M 1500

Patent

active

052691780

ABSTRACT:
Disclosed are a method and apparatus for comparing torsional stress/strain states of a power transmitting member of an internal combustion engine to detect an abnormal combustion condition, including misfire, knock or roughness. Statistical processing steps may be used to detect an abnormal combustion event including: calculating a mean and standard deviation for a set of signals related to the torsional stress induced in the power transmitting member, calculating a difference between a later signal and the mean, calculating a ratio of the difference to the standard deviation, and comparing the ratio to a threshold. The ratio so obtained from a given cylinder may further be compared with one or more other such ratios from other cylinders. A magnetostrictive sensor may preferably be used to obtain the signals relating to the torsional stress in the power transmitting member, such as the engine crankshaft. In addition, the magnetostrictive sensor may include windings to cancel induced electromagnetic interference signals.

REFERENCES:
patent: 2912642 (1959-11-01), Dahle
patent: 3011340 (1961-12-01), Dahle
patent: 3939711 (1976-02-01), Hanaoka
patent: 4064748 (1977-12-01), Leshner et al.
patent: 4301678 (1981-11-01), Full et al.
patent: 4380800 (1983-04-01), Wilkinson
patent: 4414856 (1983-11-01), Winterhoff
patent: 4467640 (1984-08-01), Morrison
patent: 4503714 (1985-03-01), Winterhoff
patent: 4606005 (1986-08-01), Ribbens
patent: 4697459 (1987-10-01), Nonomura et al.
patent: 4697460 (1987-10-01), Sugiyama et al.
patent: 4760745 (1988-08-01), Garshelis
patent: 4803885 (1989-02-01), Nonomura et al.
patent: 4843870 (1989-07-01), Citron et al.
patent: 4886029 (1989-12-01), Lill et al.
patent: 4928228 (1990-05-01), Fujimoto et al.
patent: 4932379 (1990-12-01), Tang et al.
patent: 4939937 (1990-07-01), Klauber et al.
patent: 4940030 (1990-07-01), Morikawa
patent: 4979399 (1990-12-01), Kauber et al.
patent: 5144846 (1992-09-01), Klauber et al.
SAE Paper 920236, Robert D. Klauber et al., "Miniature Magnetostrictive Misfire Sensor," Feb. 1992.
SAE Technical Paper Series 890486, Cylinder by Cylinder Engine Pressure and Pressure Torque Waveform Determination Utilizing Speed Fluctuations by: Stephen J. Citron, John E. O'Higgins and Lillian Y. Chen Feb. 27/Mar. 3, 1989.
SAE Technical Paper Series 8900485, On Line Cylinder Diagnostics on Combustion Engines by Noncontact Torque and Speed Measurements by: George F. Mauer and Robert J. Watts Feb. 27-Mar. 3, 1989.
SAE Technical Paper Series 890884, Diagnosis of Individual Cylinder Misfires by Signature Analysis of Crankshaft Speed Fluctuations by: G. Rizzoni Feb. 27-Mar. 3, 1989.
SAE Technical Paper Series, Magnetostrictive Torque Sensors--Analysis of Performance Limits by: William J. Fleming, Feb. 27-Mar. 3, 1989.
IEEE Trans on Vehicular Technology, vol. VT-24, No. 2, May 1975, Monitoring Combustion Quality in Internal Combustion Engines Using Spark Plug as a Plasma Probe, by: Johnson & Rado.
SAE paper 900232, 1990, Methods of On-Board Misfired Detection by: Plapp et al.
Jun Sugiyama, et al. Noncontacting Magnetic Torque Sensor: Rapid Measurement of Mean Torque of Each Cylinder in Each Cycle: Transducers 87.
Beth and Meeks, Magnetic Measurement of Torque in a Rotating Shaft, The Review of Scientific Instruments vol. 24, No. 6, Jun., 1954 pp. 603-607.
Ribbens and Rizzoni, Onboard Diagnosos of Engine Misfires SAE Technical Paper Series No. 901768 Sep. 17-20, 1990.
SAE paper 870472 Nonomura et al "Measurement of Engine Torque with the Intra-Bearing Torque Sensor" Feb. 1987.

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