Jump Lambda Sensor Operational Readiness Detection
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Solution Overview
Problem
Jump lambda sensors in internal combustion engines face challenges in rapid and reliable detection of operational readiness due to polarization effects from traditional internal resistance measurement methods, which can delay lambda control activation and misinterpret sensor faults.
Innovation Solution
Adaptive frequency pulsed current method for measuring internal resistance, where frequency changes based on sensor state to minimize polarization effects, allowing for rapid and reliable detection of operational readiness without distorting the sensor signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal resistance measurement is performed using traditional pulse-shaped current to detect operational readiness, then the sensor temperature can be determined, but polarization effects occur that distort the sensor signal and delay lambda control activation
Solution Approach 1:
The patent applies periodic pulsed current measurements at specifically selected low frequencies to measure internal resistance. By using periodic pulses rather than continuous current, the sensor is given time to relax between measurements, minimizing polarization buildup while still obtaining temperature data for operational readiness detection.
Solution Approach 2:
The patent changes the frequency parameter of the measurement current to a low frequency range that minimizes polarization effects. By adjusting this physical parameter, the measurement process itself is modified to reduce harmful polarization while maintaining the ability to detect sensor temperature and operational readiness.
2Productivity
If internal resistance measurement is performed frequently to rapidly detect operational readiness, then detection speed improves, but polarization effects accumulate and distort the sensor signal
Solution Approach 1:
The system performs measurements periodically at low frequency intervals rather than continuously. This periodic approach allows the sensor to recover between measurements, preventing polarization accumulation while still providing timely detection of operational readiness when the sensor heats up.
Solution Approach 2:
The measurement frequency is dynamically adapted based on sensor state. The system uses low frequency measurements that can be increased in rate as the sensor approaches operational temperature, optimizing detection speed while maintaining signal integrity throughout the heating process.
3Measurement precision
If high frequency alternating current is used for internal resistance measurement, then measurement precision is high, but the sensor wiring cannot support it and polarization effects are severe
Solution Approach 1:
The patent changes the frequency parameter of the measurement current from high frequency to low frequency range. This parameter change makes the measurement compatible with simple jump sensor wiring while still providing sufficient measurement precision for detecting operational readiness through internal resistance changes.
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 fast and accurate detection of operational readiness, independent of exhaust gas composition, reducing delays in lambda control activation and minimizing false positives, leading to improved emissions control.
Implementation Method 1
the internal resistance of the sensor being measured as the criterion for the operational readiness of the sensor
Implementation Method 2
The polarization has a particularly strong effect when the sensor is cold and also decays only slowly with a cold sensor
Implementation Method 3
The solid electrolyte has the property of being able to transport oxygen ions electrolytically at high temperature, whereby a voltage is produced
Data Source
AI summary
In a method for detecting the operational readiness of a jump lambda sensor associated with an internal combustion engine the internal resistance of the sensor is determined as the criterion for the operational readiness of the sensor. The internal resistance is measured by applying a pulsed current to the sensor, the frequency of the current being selected as a function of the state of the sensor (1, 2, 3, 4).