Test Bench Simulating Wideband Lambda Sensor Electrical Response
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Solution Overview
Problem
Conventional test benches for wideband lambda sensors use a simple resistor to apply pump voltage, resulting in an electrical response that deviates from the actual sensor's response, leading to unrealistic simulations and fault recognition by control systems.
Innovation Solution
A test bench with a complex electrical circuit comprising diodes, resistors, and a capacitor is used to simulate the electrical response of a wideband lambda sensor, including a controllable resistor to simulate temperature dependence, allowing for a qualitative and quantitative simulation of the sensor's behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple resistor is used to apply pump voltage in the test bench, then the device complexity is reduced, but the measurement precision of the electrical response simulation deteriorates
Solution Approach 1:
The patent transforms the electrical circuit parameters from a simple resistive model to a complex non-linear model incorporating diodes, resistors, and capacitors. This parameter change enables the circuit to reproduce the non-linear electrical response characteristics of the wideband lambda sensor, including the relationship between pump voltage, pump current, and diffusion voltage, thereby achieving accurate simulation without requiring the actual sensor hardware.
Solution Approach 2:
The patent creates an electrical equivalent circuit that copies the electrical behavior of the wideband lambda sensor. By designing a circuit with diodes, resistors, and capacitors that replicates the sensor's current-voltage characteristics, the test bench can simulate the sensor's response to pump voltage applications, enabling realistic testing of control systems without the actual sensor.
2Measurement precision
If a complex electrical circuit with diodes, resistors, and capacitor is used to simulate the electrical response, then the measurement precision of the simulation is improved, but the device complexity increases
Solution Approach 1:
The patent divides the electrical simulation function into separate components: diodes for non-linear current-voltage characteristics, resistors for ohmic behavior, and capacitors for transient response simulation. This segmentation allows each component to handle specific aspects of the sensor's electrical response, making the complex simulation task manageable and enabling precise reproduction of the sensor's behavior through coordinated component action.
3Ease of manufacture
If the electrical circuit does not accurately simulate the sensor's response, then the ease of manufacture of the test bench is improved, but the reliability of the testing process deteriorates
Solution Approach 1:
The patent incorporates feedback mechanisms where the electrical circuit continuously adjusts its response based on the applied pump voltage to reproduce the sensor's actual behavior. The circuit monitors the voltage-current relationship and adjusts the diffusion voltage output to match expected sensor characteristics, ensuring that the simulation remains reliable and plausible for testing control system diagnostic functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables a realistic and fault-free testing of control systems by accurately mimicking the electrical response of a wideband lambda sensor, even under high requirements, ensuring plausibility and reliability of the simulation.
Implementation Method 1
The electrical circuit (30) is configured to generate a current in response to an applied pump voltage in a manner that corresponds to a current-voltage characteristic of a wideband lambda sensor
Data Source
AI summary
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.