Physical Quantity Detection Error Compensation
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Solution Overview
Problem
Existing humidity detection devices in internal combustion engines face accuracy issues due to variations in detection element characteristics, leading to increased tolerances and costs, and require complex error calculations to correct sensor data.
Innovation Solution
A physical quantity detection device comprising multiple detection units, a storage unit for error characteristics, and an error calculation unit that calculates total errors from these characteristics to achieve desired accuracy without raising individual tolerance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tolerances of detection elements are raised to reduce allowable error and obtain desired accuracy, then measurement precision is improved, but manufacturing cost and percent defective are increased
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing the individual characteristics of each detection element in a storage unit during the manufacturing process. These characteristics (such as sensitivity and offset values) are recorded before the product is shipped to the customer. When the device operates, the calculation unit uses these pre-stored characteristics to compensate for variations in detection elements, thereby achieving high measurement precision without requiring tight manufacturing tolerances. This resolves the contradiction by shifting the accuracy improvement from the manufacturing stage to the operation stage.
2Measurement precision
If correction data of detection elements is output to sensor signal processing device for physical quantity correction, then measurement precision is improved, but device complexity and calculation complexity are increased
Solution Approach 1:
The patent applies self-service by enabling the detection device to automatically correct its own measurement errors using the pre-stored individual characteristics of detection elements. The calculation unit internally processes the correction by combining the detected physical quantity with the stored characteristics to compute the final accurate value. This self-correction mechanism eliminates the need for external complex error calculation systems, reducing device complexity while maintaining high measurement precision. The system serves itself by using its own stored data to compensate for its own errors.
Data Source
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Figure 3(a)~3(b)
AI summary
To achieve a physical quantity detection device capable of obtaining a desired overall device accuracy without unnecessarily raising the tolerances of detection elements, the present invention is characterized by having a plurality of physical quantity detection units (21, 31) for respectively detecting a plurality of physical quantities, a storage unit (42) for storing the error characteristics of individual physical quantity detection units (21, 31), a physical quantity calculation unit (61) for using at least two physical quantities detected by at least two of the plurality of physical quantity detection units (21, 31) to calculate a separate physical quantity, and an error calculation unit (43) for reading the error characteristics of the plurality of physical quantity detection units (21, 31) from the storage unit (42) and calculating the error of the separate physical quantity.