Cylinder-by-cylinder engine pressure and pressure torque waveform determination utilizing crankshaft speed fluctuations
US4843870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Jul 25, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1015
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An elastic model of the engine-drivetrain system is proposed. Measured crankshaft speed fluctuation data is developed and computations are made from the model to determine the fluctuation waveform of both the total engine torque being developed and the engine pressure torque. Utilizing the engine pressure torque fluctuation waveform, the mean level of engine torque being developed is obtained, thus providing the full engine pressure torque waveform. Finally, the engine pressure torque waveform is used to obtain the cylinder pressure waveform which gave rise to it. Knowledge of these torques and of the cylinder pressure provides the basis for both open loop and adaptive engine control strategies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.