Oxygen Sensor Control Device Impedance Detection
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Solution Overview
Problem
Conventional control devices for oxygen concentration sensors require adapting map data for each chip set, leading to lengthy processes for detecting element impedance and recovering terminal voltage, which hampers efficient engine control.
Innovation Solution
A control device with a voltage sweeping unit, pre-sweeping voltage memory, impedance detection unit, voltage returning unit, monitoring unit, determination unit, and stop unit that applies voltage for a predetermined time, stores initial terminal voltage, detects impedance, and quickly returns the terminal voltage to its initial state without adapting map data, using a monitoring and determination process to stabilize the voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If map data adaptation is performed for each chip set to detect element impedance and recover terminal voltage, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The system performs self-calibration by automatically detecting the initial terminal voltage before voltage sweeping and using this detected value as the reference for voltage recovery, eliminating the need for external map data adaptation procedures while maintaining measurement precision
Solution Approach 2:
The system detects and stores the initial terminal voltage in advance before performing voltage sweeping for impedance detection. This preliminary detection of the baseline voltage enables rapid recovery without requiring time-consuming map data adaptation for each chip set
2Measurement precision
If voltage sweeping is applied for element impedance detection, then measurement precision is improved, but stability of the object's composition deteriorates
Solution Approach 1:
The system monitors the terminal voltage during and after voltage sweeping, detects when the voltage has recovered to the initial level, and uses this feedback to control the timing of subsequent operations, ensuring stable conditions for accurate measurements
Solution Approach 2:
The system employs periodic voltage sweeping at controlled intervals, allowing the terminal voltage to fully recover between sweeping cycles. This periodic approach maintains measurement precision while preventing excessive voltage fluctuations that would compromise system stability
3Productivity
If map data adaptation is eliminated for faster voltage recovery, then productivity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The system determines the initial terminal voltage through self-detection before voltage sweeping and uses this self-determined value as the reference for recovery, eliminating the need for pre-programmed map data while ensuring accurate voltage recovery through autonomous calibration
Solution Approach 2:
The system dynamically adjusts the voltage recovery target based on the detected initial terminal voltage rather than using fixed map data values. This parameter adaptation enables both rapid recovery (improving productivity) and accurate voltage restoration (maintaining manufacturing precision) for each specific sensor
Data Source
AI summary
A control device for controlling an oxygen concentration sensor includes: a voltage sweeping unit for applying a voltage to the sensor for a time interval during an impedance detection process; a pre-sweeping voltage memory for storing a terminal voltage of the sensor as an initial terminal voltage just before applying the voltage; an impedance detection unit for detecting an element impedance; a voltage returning unit for returning the terminal voltage to the initial terminal voltage after a predetermined time interval has elapsed; a monitoring unit for monitoring the terminal voltage after the voltage returning unit starts returning the terminal voltage; a determination unit for determining whether a monitored terminal voltage of the sensor reaches a stored terminal voltage in the memory; and a stop unit for stopping a returning operation of the voltage returning unit when the monitored terminal voltage reaches the stored terminal voltage.