Mixture control monitor apparatus
US4094186A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 1977 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Feb 25, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The mixture control system of an internal combustion engine which employs an exhaust gas oxygen sensor is provided with circuitry which subjects the output signal from the sensor to comparison with established threshold values to determine the operational readiness of the sensor. When the amplitude of the sensor signal is sufficiently high, indicating proper operational temperature of the sensor, the test signal is turned off and the monitoring is taken over by a circuit which looks for regular alternation of the sensor signal at a sufficiently rapid rate. When the sensor signal is found inadequate for any reason, the closed loop control system is disengaged and the mixture control is provided on the basis of an average sensor voltage supplied by the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.