Universal Air-Fuel Ratio Sensor Control Circuit Switching
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Solution Overview
Problem
The existing air-fuel ratio sensors, both one-cell and two-cell types, require dedicated hardware for control devices, leading to increased manufacturing costs and complexity due to the variety of devices needed.
Innovation Solution
A shared air-fuel ratio sensor control device that can switch between one-cell and two-cell circuit configurations using a control circuit with changeover switches, allowing connection to either type of sensor through common terminals, enabling the same control device to manage both one-cell and two-cell sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated hardware control devices are manufactured for each sensor type, then the control function is reliable, but the manufacturing cost increases and device variety increases
Solution Approach 1:
The control device is designed with a universal structure that can interface with both one-cell and two-cell air-fuel ratio sensors through a single control unit. The control unit can be switchable between different circuit configurations (one-cell mode and two-cell mode) to accommodate different sensor types, eliminating the need for separate dedicated control devices for each sensor type while maintaining reliable control functionality.
2Reliability
If dedicated hardware control devices are manufactured for each sensor type, then the control function is reliable, but the number of manufacturing increases without increasing sales
Solution Approach 1:
A single control device design can serve multiple sensor types (one-cell and two-cell) through configurable circuit modes, significantly reducing the variety of devices that need to be manufactured. This universality allows the same control device to be produced in large volumes for different sensor types, improving manufacturing efficiency and reducing costs while maintaining reliable control through software-based configuration rather than hardware variety.
3Ease of manufacture
If a shared control device is designed for both sensor types, then manufacturing cost is reduced, but the device complexity increases
Solution Approach 1:
The control device incorporates dynamic switchability between different circuit configurations (one-cell mode and two-cell mode) through changeover switches controlled by a control unit. This dynamic reconfiguration allows a single control device to adapt to different sensor types without requiring permanent complex hardware for all possible configurations simultaneously. The complexity is managed through controlled switching rather than permanent multi-path wiring, reducing overall device complexity while maintaining manufacturing cost benefits.
4Adaptability or versatility
If a shared control device is designed for both sensor types, then device variety is reduced, but the control precision for specific sensor types may be compromised
Solution Approach 1:
The control device uses dynamic switching mechanisms (changeover switches) to select between one-cell circuit configuration and two-cell circuit configuration based on the connected sensor type. This dynamic adaptation ensures that the control circuit is optimized for the specific sensor type being used, maintaining precise air-fuel ratio detection control. The control unit can be programmed with specific control parameters for each mode, ensuring measurement precision is not compromised while achieving broad sensor type compatibility.
Data Source
AI summary
An air-fuel ratio sensor control device, connected with two-cell type air-fuel ratio sensor having electromotive force and oxygen pump cells with first to third two-cell terminals or a one-cell type air-fuel ratio sensor having a single cell with first and second one-cell terminals, includes: first to third connection terminals for connecting the one-cell or two-cell type air-fuel ratio sensor; a control circuit that is switchable between a two-cell circuit configuration for controlling the two-cell type air-fuel ratio sensor through the first to third connection terminals and a one-cell circuit configuration for controlling the one-cell type air-fuel ratio sensor through the first and second connection terminals; and a control unit that sets a circuit configuration of the control circuit to the one-cell or two-cell circuit configuration.