Method of estimating the duration of target wheel teeth
US7543486B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2007 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Dec 20, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/009
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining as a function of time the angle of rotation of a crankshaft by estimating the position of missing teeth on a target wheel is disclosed which has application to engine control. A sensor acquires, as a function of time, a periodic signal comprising a pulsating waveform, each pulse indicating the passage of a tooth past this sensor. The position of a missing pulse on the signal is estimated from a missing tooth on the target wheel, by: estimating, during a cycle N, a time interval S between the passage past the sensor of a tooth dp preceding the missing tooth d and the passage past the sensor of a tooth ds following missing tooth d, by means of the time interval between the passages of the same teeth during the previous cycle N−1 then, estimating the position of the missing pulse in this interval S, according to the position of the pulses in time interval A between the passage past the sensor of tooth ds−r and the passage past the sensor of tooth ds−r during cycle N, withthe engine being a j-stroke (2 or 4) engine and comprising k cylinders and a target wheel with l teeth, including the missing tooth; finally, determining as a function of time the crankshaft r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.