Dual-Microprocessor Sensor Timing for In-Vehicle Steering Control
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Solution Overview
Problem
Existing in-vehicle power steering systems face challenges in synchronizing data acquisition from multiple sensors, leading to inaccurate redundant comparisons due to unsynchronized signal timing among microprocessors.
Innovation Solution
A control apparatus with dual sensors and microprocessors, where each microprocessor generates request signals to synchronize data transmission from both sensors, allowing for accurate comparison and reducing false determinations by excluding self-diagnosis data and optimizing data selection for closer timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple microprocessors independently acquire sensor data, then each microprocessor can operate autonomously, but the data acquisition timing becomes unsynchronized leading to inaccurate redundant comparison
Solution Approach 1:
A timing coincidence determination unit is introduced as an intermediary component that receives data acquisition timing information from multiple microprocessors and determines whether their timing coincides. This mediator coordinates the timing synchronization without requiring the microprocessors to directly communicate or wait for each other, thus maintaining autonomous operation while achieving synchronized data acquisition timing for accurate redundant comparison.
2Reliability
If sensor data is transmitted multiple times within a predetermined period, then more data is available for comparison, but the data transmission and processing load increases
Solution Approach 1:
The system transmits sensor data multiple times within a predetermined period (excessive action) to ensure sufficient data availability for accurate abnormality determination. However, the timing coincidence determination unit selectively processes only those data sets where acquisition timing coincides between microprocessors, avoiding unnecessary processing of mismatched data and thus controlling processing complexity while maintaining high reliability.
Data Source
AI summary
According to one aspect of the present invention, a control apparatus for an in-vehicle apparatus includes a first sensor and a second sensor configured to output sensor data, and a first microprocessor and a second microprocessor. A second sensor data request signal generation portion of the second microprocessor is configured to generate a second sensor data request signal. The first microprocessor includes a first sensor data request signal generation portion, a first data comparison portion, a first abnormality determination portion, and a first instruction signal generation portion. The first sensor data request signal generation portion is configured to generate a first sensor data request signal. The first data comparison portion is configured to compare first comparison data selected from a plurality of an first sensor data and second comparison data selected from a plurality of an second sensor data. The first abnormality determination portion is configured to determine whether an abnormality has occurred in an sensor portion based on a result of the comparison by the first data comparison portion.