Method and device for detecting misfires in a controlled-ignition internal combustion engine
US6185928A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1997 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Apr 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Gas torque (Cg) is determined for each cylinder combustion. Engine speed (N) and air admission manifold pressure (Pca) are measured during the corresponding prior admission phase. A reference torque (Cref), which is a function of N and Pca, is cartographically calculated by interpolation. The reference torque Cref, for example, is corrected by multiplication with a coefficient (KM) associated with the corresponding cylinder in a stabilized engine operating mode. In a transient mode, an additive correction (KA) is also made to derive the expected theoretical torque (Cpr), which is compared with the gas torque (Cg) so as to determine that misfire has occurred if Cpr/Cg>S2, where S2 is a threshold value. The process and device are suitable for generating signals representative of engine operation or indicating that the threshold level of harmful components discharged into the exhaust gases is exceeded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.