Rotation Sensor Diagnostics Without AD Timing Synchronization

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Solution Overview

Problem

Existing rotation angle detection devices require synchronization of AD conversion timings among multiple AD converters, making it challenging to diagnose detection failures without complex synchronization processes.

Innovation Solution

A monitoring control device and method that calculates a first absolute angle at one timing and a second absolute angle at a different timing, generating diagnostic signals for comparison to diagnose detection failures without synchronization of conversion timings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple AD converters are used to detect rotation angle, then measurement precision is improved, but device complexity increases due to synchronization requirements

Engineering Contradiction:

Improverotation angle detection precisionVSAvoidsynchronization control complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent divides the rotation angle detection function into multiple independent AD converters, each capable of independently converting analog signals to digital values. This segmentation allows parallel detection while maintaining individual converter independence, reducing the need for complex synchronization mechanisms.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses multiple AD converters as redundant copies to perform the same conversion function simultaneously. By having duplicate conversion paths, the system achieves improved measurement precision through comparison and averaging, while the independent operation of each copy eliminates synchronization complexity.

Inventive Principle:

Principle #26Copying

2Reliability

If AD conversion timings are synchronized among multiple AD converters, then reliability of rotation state detection is improved, but ease of operation deteriorates due to complex synchronization control

Engineering Contradiction:

Improvedetection failure diagnosis reliabilityVSAvoidconversion timing control ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Each AD converter operates autonomously without requiring external synchronization signals. The converters independently perform analog-to-digital conversion at their own timing, and the system achieves reliable detection by comparing results from multiple independent conversions, eliminating the need for complex synchronization control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent performs multiple AD conversions at different timings rather than requiring precise synchronization. By accepting a range of conversion timings and using redundancy to compensate for timing differences, the system maintains high reliability while simplifying operational control.

Inventive Principle:

Principle #16Partial or excessive action

3Ease of operation

If multiple AD converters operate independently without synchronization, then ease of operation is improved, but measurement precision deteriorates due to timing differences

Engineering Contradiction:

Improveconversion timing control easeVSAvoidrotation angle detection precision

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent combines results from multiple independent AD converters through digital signal processing. By merging the digital values from converters operating at different timings, the system compensates for individual timing variations and achieves accurate rotation angle detection without requiring synchronization.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system uses feedback mechanisms to compare results from multiple AD converters and adjust measurements accordingly. By analyzing discrepancies between independent conversions and applying correction algorithms, the system maintains high measurement precision despite timing differences between converters.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11781887B2Monitoring control device and monitoring control method

Publication Date: 2023.10.10 NISSAN MOTOR CO LTD

AI summary

A monitoring control device for diagnosing a presence/absence of a detection failure of a rotation state of a rotator includes: a rotation sensor that detects the rotation state of the rotator and outputs an analog signal in response to the detected rotation state; a converter that calculates a first absolute angle of the rotator at a first timing based on the analog signal and outputs a signal including the first absolute angle; a first control device 10 that obtains the first absolute angle; and a second control device 20 that calculates a second absolute angle of the rotator at a second timing different from the first timing based on the analog signal. The first control device 10 generates a first diagnostic signal based on the first absolute angle, and outputs the first diagnostic signal to the second control device. The second control device generates a second diagnostic signal based on the second absolute angle, and compares the first diagnostic signal with the second diagnostic signal to diagnose the presence/absence of the detection failure of the rotation state.