Apparatus for controlling heater for heating oxygen sensor
US4993392A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Apr 3, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1494
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An apparatus for controlling a heater for heating an oxygen sensor provided in an exhaust gas flow passage of an internal combustion engine disposed in an automotive vehicle includes a detection circuit, a decision circuit and a power supply control circuit. The monitor circuit detects a driving condition parameter of the automotive vehicle. The decision circuit determines, from a driving condition represented by the driving condition parameter detected by the detecting circuit, whether or not a power supply control to the heater should be executed. The power supply control circuit supplies, during a predetermined period of time, the heater with an amount of power which is smaller than that to be supplied thereto in a normal driving condition when it is determined that the power supply control to the heater should be executed by the decision circuit so that a resistance value of said heater is controlled to a target resistance value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.