Digital Sensor Averaging for ECU Frequency Mismatch
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Solution Overview
Problem
Existing methods for controlling electronic control units in motor vehicles are imprecise when dealing with digital sensors that send data at a higher frequency than the processing frequency of the control units, leading to average values of physical quantities being considered constant over processing periods, which fails to account for continuous variations.
Innovation Solution
A method that involves storing measurement data and their ages in a buffer memory, determining an interpolation curve, and using it to estimate the average value of physical quantities over multiple processing periods, allowing for precise dynamic behavior estimation without increasing computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital sensors send measurement data at a frequency higher than the processing frequency of the electronic control unit, then measurement precision is improved, but device complexity increases due to the need to manage the offset between send and processing frequencies
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing intermediate values (partial sums and counts) in buffer memory during each processing period. These pre-computed values are then used in the next processing period to quickly determine average values without requiring complex real-time calculations, thus resolving the contradiction between high measurement precision and device complexity.
2Device complexity
If only a single measurement datum is taken per processing period, then device complexity is reduced, but measurement precision deteriorates because continuous variations in physical quantity are not captured
Solution Approach 1:
The patent implements continuity of useful action by continuously accumulating measurement data in the buffer memory across multiple processing periods and using interpolation curves to represent continuous variations in physical quantities. This allows the system to maintain simple processing logic while accurately capturing continuous changes, thereby improving measurement precision without significantly increasing device complexity.
3Measurement precision
If multiple measurement data are stored and processed to capture continuous variations, then measurement precision is improved, but use of energy increases due to additional computational resources required
Solution Approach 1:
The patent applies segmentation by dividing the buffer memory into multiple slots (e.g., 6 slots) that can be independently managed and processed. This segmentation allows the electronic control unit to process only the necessary portion of stored data using simple interpolation algorithms, thereby achieving high measurement precision for dynamic behavior estimation while minimizing computational energy consumption compared to processing all data points comprehensively.
Data Source
AI summary
A method for controlling a motor-vehicle electronic control unit with a view to acquiring the measurement of a physical quantity using a digital sensor connected to the electronic control unit, in which method the sensor sends measurement digital data with a send period and the electronic control unit processes these measurement data with a processing period, the send period being shorter than the processing period. At the end of each processing period, the average value of the measured physical quantity is determined over an interval of N preceding processing periods.