Sensor Signal Processing Device Crank Angle Synchronization
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Solution Overview
Problem
Conventional methods for compensating filter delay time in engine control systems require significant storage capacity and often fail to synchronize sensor signals with crank angles accurately, leading to inefficiencies and increased costs.
Innovation Solution
A sensor signal processing device comprising an AD conversion section, a filter section, a timing signal generation section, and an arithmetic section that converts analog signals to digital, filters noise, and compensates for filter delay by generating a data acquisition timing signal synchronized with the crank angle, using a semiconductor integrated circuit to reduce storage requirements and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all data passing through the digital filter is stored in RAM for filter delay compensation, then filter delay time can be compensated, but storage capacity of RAM becomes huge and cost increases
Solution Approach 1:
The patent extracts only the necessary filter delay compensation function from the complete data storage requirement. Instead of storing all filtered data in RAM, it stores only the delay compensation information and processes data in a streaming manner, significantly reducing storage capacity requirements while maintaining compensation accuracy.
Solution Approach 2:
The patent performs preliminary calculation of filter delay compensation values before actual data processing. By pre-calculating and storing only the compensation parameters rather than all raw data, the system reduces storage requirements while ensuring accurate delay compensation is available when needed.
2Productivity
If sensor signal is AD converted at predetermined intervals, then AD conversion can be performed regularly, but timing of desired crank angle is less likely to correspond to AD conversion timing, reducing synchronization accuracy
Solution Approach 1:
The patent transitions from fixed predetermined AD conversion intervals to dynamic AD conversion timing that is adjusted based on the actual crank angle position. The system calculates optimal AD conversion moments that synchronize with crank angle events, enabling both regular processing and precise synchronization by adapting conversion timing to dynamic engine conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate synchronization of sensor signals with crank angles while reducing storage capacity needs, minimizing costs and ensuring precise data acquisition, with a configuration that maintains waveform integrity and reduces distortion.
Implementation Method 1
an AD conversion section (7) converting the analog sensor signal to a digital signal
Implementation Method 2
a digital filter (8) filtering the digital sensor signal
Data Source
AI summary
A sensor signal processing device includes an AD conversion section, a filter section, a timing signal generation section, and an arithmetic section. The timing signal generation section generates a signal synchronized with a crank angle of an engine based on a signal indicating the crank angle and generates a data acquisition timing signal by compensating the signal synchronized with the crank angle with a delay time of the filter. The arithmetic section acquires a plurality of sensor signals, which is transmitted from a sensor, converted from an analog signal to a digital signal by the AD conversion section, and filtered by the filter section, in a term before and after receiving the data acquisition timing signal and generates a data synchronized with the data acquisition timing signal.