Intake Pressure Detection for Single Cylinder Engines
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Solution Overview
Problem
Conventional methods fail to accurately estimate the bottom pressure in a single cylinder engine due to varying timing of pressure generation with engine speed or load, making correct intake pressure measurement challenging.
Innovation Solution
An intake pressure detection apparatus with an intake pressure sensor, crank angle sensor, sampling unit, and calculation unit that samples intake pressures during the intake stroke and calculates the bottom pressure by averaging values after excluding extreme values, allowing for precise fuel injection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If intake pressure is measured at a predetermined point in time, then the measurement process is simple, but the measurement accuracy deteriorates because the bottom pressure timing changes with engine speed or load
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed predetermined measurement timing to a dynamic sampling approach that collects multiple pressure values throughout the intake stroke. The system adapts the measurement strategy to the varying engine conditions (speed, load) by continuously monitoring and selecting appropriate sampling moments, thereby maintaining measurement accuracy across different operating states.
Solution Approach 2:
The patent implements preliminary action by pre-defining multiple sampling timing points throughout the intake stroke before actual measurement occurs. The system prepares a set of candidate sampling moments in advance and selects from these pre-planned time points based on real-time engine condition assessment, ensuring accurate bottom pressure capture without requiring complex real-time timing calculations.
2Measurement precision
If multiple intake pressures are sampled and processed to find bottom pressure, then measurement accuracy improves, but device complexity increases due to additional sampling and calculation units
Solution Approach 1:
The patent applies segmentation by dividing the intake stroke into multiple discrete sampling intervals, where the sampling unit captures pressure values at specific time points. This segmentation allows the system to process multiple pressure readings systematically, identifying the minimum value (bottom pressure) from the segmented data points while maintaining manageable computational complexity through structured data collection and analysis.
3Measurement precision
If detection timing is adjusted for different engine conditions, then measurement accuracy improves, but ease of operation deteriorates due to manual adjustment requirements
Solution Approach 1:
The patent implements self-service by enabling the detection apparatus to automatically adapt its sampling strategy based on real-time engine condition monitoring. The system independently assesses operating parameters (speed, load) and autonomously selects optimal sampling timing points without requiring manual intervention or external adjustment, thereby maintaining high measurement accuracy while simplifying operation.
Data Source
AI summary
An intake pressure sensor is provided in an intake path of a single cylinder engine and detects an intake pressure. A crank angle sensor detects a crank angle of the single cylinder engine. A sampling unit samples the intake pressure detected by the intake pressure sensor when the crank angle detected by the crank angle sensor becomes a sampling start angle. A calculation unit extracts M intake pressures of relatively small values of N intake pressures sampled by the sampling unit. The calculation unit acquires, as a bottom pressure, an average value of P intake pressures remaining after several intake pressures of relatively large values and several intake pressures of relatively small values of the M intake pressures are excluded.