HUMIDITY SENSOR DIAGNOSTICS
First Claim
Patent Images
1. A method, comprising:
- indicating degradation of a humidity sensor based on a humidity sensor output and output from an intake gas composition sensor.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments for testing a humidity sensor are provided. One example method comprises indicating degradation of a humidity sensor based on a humidity sensor output and output from an intake gas composition sensor. In this way, output from the intake gas composition sensor may be used to determine if the humidity sensor is degraded.
68 Citations
19 Claims
-
1. A method, comprising:
indicating degradation of a humidity sensor based on a humidity sensor output and output from an intake gas composition sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
8. A system, comprising:
-
an exhaust gas recirculation (EGR) system; a humidity sensor disposed in an engine intake system; an intake gas composition sensor disposed in the engine intake system downstream of the humidity sensor; and a controller including instructions to; when EGR is disabled and if output from the humidity sensor changes by more than a threshold amount, indicate humidity sensor degradation based on the humidity sensor output and output from the intake gas composition sensor. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
-
-
16. A method comprising:
-
when exhaust gas recirculation (EGR) is enabled, adjusting an amount of EGR directed to an engine intake based on intake air humidity measured by a humidity sensor; and when EGR is disabled, indicating humidity sensor degradation if measured intake air humidity does not correlate to measured intake air oxygen concentration. - View Dependent Claims (17, 18, 19)
-
Specification