Peak Value Storage Register for Fuel Injection Drive Current
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Solution Overview
Problem
In fuel injection devices, multiple peaks in drive current occur during valve opening and closing operations, making it difficult for peak value holding circuits to accurately capture the first occurring peak, leading to potential misidentification and inability to hold the initial peak value in real-time.
Innovation Solution
A semiconductor device with a peak value storage register, threshold value storage register, peak determination circuit, and end timing determination circuit is employed, which determines whether to update the peak value and ends operation when the end timing is reached, ensuring the first peak is held.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a peak value holding circuit continuously updates the peak value during multiple peaks in drive current, then the circuit can capture the most recent peak, but it cannot hold the first occurring peak value
Solution Approach 1:
The circuit is pre-configured with a determination end timing signal that defines when peak detection should stop. This preliminary timing setup enables the circuit to automatically cease operation after detecting the first peak, ensuring the first peak value is held without continuous updating during subsequent peaks
Solution Approach 2:
The end timing determination circuit provides feedback to the peak determination circuit to control when peak detection should terminate. This feedback mechanism ensures that the peak value holding circuit stops updating at the appropriate time, preserving the first peak value while preventing erroneous updates from later peaks
2Adaptability or versatility
If the peak determination circuit operates continuously without end timing control, then it can detect any peak, but it cannot distinguish when to stop and hold the first peak
Solution Approach 1:
The determination end timing is predetermined and provided to the peak determination circuit before operation begins. This preliminary timing information enables the circuit to operate flexibly during the designated period while reliably stopping at the correct moment to hold the first peak value
Solution Approach 2:
The peak determination circuit dynamically adjusts its operation based on the received determination end timing signal. The circuit operates during the specified time window to detect peaks adaptively, then automatically transitions to a holding state when the end timing is reached, ensuring reliable first peak capture
Data Source
AI summary
A semiconductor device has a peak value storage register, a threshold value storage register, a peak determination circuit, and an end timing determination circuit. The peak determination circuit determines whether or not to update a value stored in the peak value storage register. Further, the peak determination circuit ends an operation if the end timing determination circuit determines that an end timing has arrived. The peak value storage register updates a storage value if the peak determination circuit determines to perform updating. The end timing determination circuit determines that the end timing of the operation of the peak determination circuit has arrived if the value of an input signal becomes smaller than a value obtained by decreasing or increasing the value stored in the peak value storage register by a value corresponding to a threshold value stored in the threshold value storage register.