Method of voltage compensation for an air/fuel ratio sensor
US4750353A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1987 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | Feb 25, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1455
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of voltage compensation for an air/fuel ratio sensor as may be used in the exhaust system of a fuel injected internal combustion engine. The method comprises the steps of storing the design supply voltage in a look-up table, measuring the real time supply voltage and calculating a binary fraction value from the ratio of the present or real time supply voltage value and the design supply voltage value. The predetermined design threshold voltage value of the sensor is stored and then it is multiplied by the binary fraction value to get a real time threshold voltage value. The voltage output of the sensor is measured and compared with the real time threshold voltage value. In response to the comparison, a control signal is generated indicating whether or not the air/fuel mixture is lean.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.