Method of pulse width modulating an oxygen sensor
US5596975A · kind A · utility
18Cited by
14References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1995 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Dec 20, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1494
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for pulse width modulating a resistance element of an oxygen sensor. The method quickly heats the resistance element of the oxygen sensor soon after start of the engine with a relatively high duty cycle yielding wide pulse widths. During a mid oxygen sensor temperature range, the method decreasing the duty cycle and thereby the pulse width modulation. And, upon the oxygen sensor reaching peak operating temperature range, the method decreases the pulse width modulated voltage signal supplied to the oxygen sensor to relatively short duty cycled pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.