Test bench for simulating the electrical response of a wideband lambda sensor
AssigneedSPACE digital signal processing and control engineering GmbH
InventorsDirk Hasse, Michael Wartig
Life of this patent
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Abstract
A test bench for a control system for controlling a wideband lambda sensor, which is configured to calculate an actual value, which represents an oxygen concentration in a measuring gap of a wideband lambda sensor or an indicator value from which the oxygen concentration can be derived, with consideration of a current generated by a pump voltage in an electrical circuit. In order to simulate the electrical response of a pump cell of the wideband lambda sensor, a first diode and a second diode are connected in parallel in the electrical circuit such that a current flows through the first diode at a first polarity of the pump voltage and a current flows through the second diode at a second polarity of the pump voltage.
Claims14
A test bench for a control system configured to control a wideband lambda sensor, the test bench having an electrical circuit comprising:
- a first terminal;
- and
- a second terminal, a pump voltage is applied by the control system such that a drop across the electrical circuit is caused,
- wherein the test bench is configured to calculate an actual value, which represents an oxygen concentration in a measuring gap of a wideband lambda sensor or an indicator value from which the oxygen concentration is derived based on a current generated by the pump voltage in the electric circuit,
- wherein the test bench provides the actual value at a data output of the test bench so that the actual value is read out by the control system, and
- wherein, in the electrical circuit, a first diode and a second diode are connected in parallel such that a current flows through the first diode at a first polarity of the pump voltage and a current flows through the second diode at a second polarity of the pump voltage.
A test method for a control system configured to control a broadband lambda sensor, the method comprising:
- connecting the control system to an electrical circuit such that a pump voltage, which is controlled by the control system and is provided for application to a pump cell of the wideband lambda sensor, drops across the electrical circuit;
- calculating, based on the pump voltage, an actual value that represents an oxygen concentration in a measuring gap of a wideband lambda sensor or an indicator value from which the oxygen concentration is derived;
- and
- connecting, in the electrical circuit, a first diode and a second diode in parallel such that a current flows through the first diode at a first polarity of the pump voltage and a current flows through the second diode at a second polarity of the pump voltage.
Dependencies are inferred from the claim text.