Back to results
US 2006/0137427 A1Published application
Circuit arrangement for operating a gas sensor
AssigneeRobert Bosch GmbH
InventorsEberhard Schnaibel, Erich Junginger, Andreas Koring, Ruediger Deibert, Harry Braun, Lothar Diehl
Life of this patent
Estimating the term…
Abstract
A circuit configuration for operating a gas sensor is described, including a reference gas space in which an electrode is situated which is supplied with a reference gas pump current to maintain the concentration of the reference gas. A diagnostic system determines a concentration change of the reference gas via a change in the reference pump current and a time-based evaluation of the sensor signal of the gas sensor.
Claims11
-10. (canceled)
A circuit configuration for operating a gas sensor, comprising:
- a structure including a reference gas space;
- a reference electrode situated in the reference gas space;
- a current source for supplying a reference pump current to the reference electrode;
- and
- a diagnostic system including a timer, wherein:
- the diagnostic system delivers a current selection signal to the current source for setting the reference pump current during a diagnostic operation of the gas sensor,
- the diagnostic system delivers a switch signal to the timer for starting the timer, and
- the diagnostic system evaluates a sensor signal of the gas sensor during diagnostic operation based on time.
5 more elements
The circuit configuration as recited in claim 9,
- wherein the lambda sensor is situated in an exhaust gas system of an internal combustion engine and an enable signal (48) triggers the diagnosis after shutdown of the internal combustion engine.
Dependencies are inferred from the claim text.