Phase angle detector
US4520449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1982 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Jul 19, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1015
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A phase angle detector for computing the phase angle of the individual impulses imparted to the crankshaft of an internal combustion engine having means for computing the sin and cos functions of each torque impulse in response to the instantaneous rotational velocity of the engine's crankshaft, means for detecting a change in the rotational velocity of the engine's crankshaft at the beginning and end of each torque impulse, means for correcting the value of the generated sin function as a function of the difference the crankshaft's rotational velocity at the beginning and end of the torque impulse, and means for computing the phase angle of the torque impulse from the cos and corrected sin functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.