Gas Sensor Control Unit Adaptive Frequency Compensation
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Solution Overview
Problem
Gas sensor systems used for engine control face challenges in achieving accurate control of air-fuel ratios due to temperature-dependent frequency characteristics, as it takes time for sensor elements to reach target temperatures, and existing technologies do not adequately address this temperature dependence.
Innovation Solution
A gas sensor system with a current control unit that performs feedback control based on the voltage of an electromotive force cell, using control constants adjusted according to temperature values, allowing for adaptive control of the gas sensor's frequency characteristics across different temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor elements are heated to target temperature by a heater, then the measurement accuracy is improved, but the time required before control can begin increases
Solution Approach 1:
The patent applies dynamics by making the control constant variable rather than fixed. The control constant changes dynamically based on the temperature of the sensor elements, allowing the system to adapt to different thermal states. This enables effective control during the warm-up phase without requiring the sensor to reach target temperature first.
Solution Approach 2:
The patent changes the parameter of the control constant based on temperature conditions. By adjusting this parameter according to the sensor's thermal state, the system can perform accurate measurements and control even at lower temperatures, thereby reducing the time required before control can begin while maintaining measurement accuracy.
2Device complexity
If the control constant is fixed, then the control system is simple, but the frequency characteristics cannot adapt to temperature changes
Solution Approach 1:
The control constant is made dynamic by linking it to temperature conditions. The system automatically adjusts the control constant based on the sensor element temperature, enabling the frequency characteristics to adapt to temperature changes without requiring a complex multi-component control system.
Solution Approach 2:
The patent modifies the control constant parameter according to temperature variations. This parameter change approach allows the system to maintain adaptability to temperature-induced frequency characteristic changes while keeping the overall control system structure relatively simple.
3Adaptability or versatility
If the control constant is adjusted based on temperature, then the frequency characteristics adaptability is improved, but the control system complexity increases
Solution Approach 1:
The patent implements a dynamic control constant that automatically adjusts with temperature changes. This dynamic adjustment mechanism provides frequency characteristics adaptability while maintaining control system simplicity through automated temperature-based modulation rather than complex multi-parameter control architecture.
Solution Approach 2:
The control system performs self-adjustment by automatically modifying the control constant based on sensor temperature feedback. This self-service capability enables the system to adapt its frequency characteristics to temperature changes without requiring external intervention or complex control logic, thereby limiting the increase in system complexity.
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
Enables timely and accurate air-fuel ratio control by adapting to temperature-dependent frequency changes, allowing for sensor measurements to begin even when the sensor temperature is below the target, thereby improving engine control accuracy.
Implementation Method 1
a first solid electrolyte that is interposed between the first outer electrode and the first inner electrode; and an electromotive force cell comprising a second outer electrode, a second inner electrode that is exposed to the measurement chamber, and a second solid electrolyte that is interposed between the second outer electrode and the second inner electrode
Implementation Method 2
the gas sensor system further comprises a heater that is used for raising the temperature of the gas sensor to a target temperature
Data Source
AI summary
A gas sensor system including a gas sensor; a current control unit; a constant control unit; and a temperature acquisition unit. The gas sensor includes a measurement chamber, a pump cell and an electromotive force cell. The current control unit performs feedback control on current flowing through the pump cell in response to the voltage of the electromotive force cell and in accordance with a control constant which characterizes the feedback control. Further, the constant control unit changes the control constant of the feedback control in accordance with a value (for example, a resistance value of the electromotive force cell) corresponding to the temperature of the gas sensor.