Humidity sensor diagnostic method using condensation clearing heater
First Claim
Patent Images
1. A method, comprisingoperating a sensor in an engine intake of an engine having a turbocharger including a compressor and a turbine, a passage of the sensor including a temperature-sensing element, a heater, and a capacitance-sensing element;
- individually distinguishing between each of heater, temperature-sensing element, and capacitance-sensing element degradation; and
setting a diagnostic code indicating the distinguished degradation.
1 Assignment
0 Petitions
Accused Products
Abstract
A diagnostic method for a capacitive humidity sensor comprising a heater, and a capacitance-sensing element that individually identifies heater, temperature-sensing element, or capacitance-sensing element degradation. By this method, individual elements of the sensor may be replaced or compensated for to allow for further operation.
-
Citations
19 Claims
-
1. A method, comprising
operating a sensor in an engine intake of an engine having a turbocharger including a compressor and a turbine, a passage of the sensor including a temperature-sensing element, a heater, and a capacitance-sensing element; -
individually distinguishing between each of heater, temperature-sensing element, and capacitance-sensing element degradation; and setting a diagnostic code indicating the distinguished degradation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system, comprising:
-
an engine having a compressor in an engine intake system; a sensor coupled in the engine intake system having a condensation heater, a capacitance sensor, and a temperature sensor; a control system with sensors and actuators, including the sensor coupled in the engine intake system, and actuators responsive to humidity including an exhaust gas recirculation actuator adjusted responsive to the humidity, to indicate capacitance-based humidity sensor degradation in response to a measured humidity of the sensor; and indicate degradation within a component of the humidity sensor in response to temperature sensor degradation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
Specification