Universal Lambda Probe Control Unit Multiplexer Design
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Solution Overview
Problem
Existing control units for lambda probes are limited in their ability to operate and evaluate multiple types of sensors, requiring separate units for each sensor type, leading to increased hardware variants, manufacturing costs, and reduced flexibility.
Innovation Solution
A universal control and evaluation unit designed as an ASIC with a multiplexer that allows flexible connection of inputs and stimulation units, enabling operation and evaluation of multiple sensor types without hardware changes, using time-division multiplexing to conserve resources and facilitate programmable adaptations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control units are used for each sensor type, then each sensor can be evaluated with dedicated hardware, but the number of hardware variants increases and manufacturing costs rise
Solution Approach 1:
The control unit is designed with a universal architecture that can evaluate multiple sensor types (lambda probes, temperature sensors, pressure sensors) using a single hardware platform. The measurement unit and evaluation logic are configured to handle different sensor signals through software programming rather than requiring separate dedicated hardware for each sensor type, thereby reducing the number of hardware variants while maintaining reliable sensor evaluation.
Solution Approach 2:
The control unit incorporates programmable and configurable evaluation logic that can be dynamically adapted to different sensor types. The measurement unit can be reconfigured through software to accommodate various sensor characteristics, allowing the same hardware to reliably evaluate different sensor types by changing the evaluation program rather than the hardware configuration.
2Reliability
If separate control units are used for each sensor type, then each unit can be optimized for its specific sensor, but manufacturing costs and production complexity increase
Solution Approach 1:
A single universal control unit design is produced in large quantities, achieving economies of scale in manufacturing. The same hardware platform is manufactured once and then programmed differently for various sensor applications, eliminating the need to manufacture separate dedicated units for each sensor type. This reduces per-unit manufacturing costs while maintaining sensor-specific optimization through software configuration.
Solution Approach 2:
The control unit uses software-configurable parameters to adapt to different sensor types rather than requiring different hardware designs. By changing evaluation parameters, measurement ranges, and processing algorithms through programming, the same manufactured unit can be optimized for specific sensor types, maintaining sensor-specific performance while reducing manufacturing complexity and cost.
3Reliability
If dedicated control units are used for each sensor, then hardware can be optimized for specific applications, but flexibility and adaptability decrease
Solution Approach 1:
The control unit features dynamic reconfigurability through software programming, allowing the same hardware to be adapted to different sensor types and applications. The evaluation logic, measurement parameters, and processing algorithms can be programmed to match specific application requirements, providing both application-specific performance and flexibility to handle various sensor types without hardware changes.
Solution Approach 2:
The control unit achieves application-specific optimization by changing software parameters rather than hardware configuration. Measurement ranges, evaluation thresholds, signal processing algorithms, and timing parameters can be programmed to match specific sensor types and applications, maintaining high performance while enabling flexibility to accommodate different sensor types on the same hardware platform.
Data Source
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AI summary
A control and evaluation unit for the operation and evaluation of at least one sensor, in particular for the operation and evaluation of at least one lambda probe of an internal combustion engine, signal inputs being disposed for the reception of analog measured signals of the at least one sensor, received analog measured signals being digitized by way of an analog/digital converter, a signal transfer unit, by way of which digitized signals are transferred to a calculation unit, being disposed, and provision being made in particular that the signal inputs are switchable by way of a multiplexer.