Method for controlling an oxygen concentration detection apparatus with a heater element
US4721088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Dec 1, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1456
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for controlling an oxygen concentration detection apparatus mounted on an engine, including an oxygen concentration sensing element and a heater element for heating the oxygen concentration sensing unit, includes an operation for detecting an engine temperature of a time immediately before the start of the supply of a drive current to the heater element, and an operation for controlling the magnitude of the drive current for a time period which is determined correspondingly to the engine temperature, to be lower than a level of the drive current to be supplied to the heater element after the elapse of the time period determined according to the engine temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.