Pre-Chamber Engine Knocking Detection via Pressure Amplitude Segmentation
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Solution Overview
Problem
In pre-chamber gas engines, the pressure wave generated by the torch jet discharged from the pre-chamber can interfere with the determination of engine knocking, leading to inaccurate assessments.
Innovation Solution
An engine-knocking determining device that acquires pressure amplitudes in the main combustion chamber, delimits them into a first section prior to the maximum in-cylinder pressure and a second section subsequent to it, and determines knocking by comparing the maximum amplitudes in these sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure amplitude filtering is applied to detect knocking, then knocking detection capability is improved, but pressure wave from torch jet discharged is mistaken as knocking noise, causing determination error
Solution Approach 1:
The pressure amplitude waveform is segmented into multiple sections based on crank angle positions. The first section includes the period from start of combustion to maximum in-cylinder pressure, while the second section includes the period from maximum in-cylinder pressure to end of combustion. By segmenting the waveform, the patent isolates the torch jet pressure wave (which occurs in the second section) from the knocking detection analysis (which focuses on the first section), thereby eliminating the harmful interference while maintaining knocking detection capability.
2Use of energy by moving object
If ignition timing is advanced to improve thermal efficiency, then engine efficiency is improved, but knocking occurrence increases
Solution Approach 1:
The patent implements a feedback mechanism where the knocking determination result is used to adjust ignition timing control. The knocking determination device continuously monitors pressure amplitudes in the first section and provides feedback to the control device. When knocking is detected, the control device retards ignition timing to prevent damage; when no knocking is detected, the control device can advance ignition timing to improve thermal efficiency. This closed-loop feedback system enables dynamic optimization of ignition timing based on real-time knocking conditions.
Data Source
AI summary
An engine-knocking determining device and method are provided for a pre-chamber engine that causes combustion by discharging flame in a pre-chamber into a main chamber. The engine-knocking determining device includes: a pressure amplitude acquiring unit that acquires pressure amplitudes of the main chamber; a section delimiting unit that delimits the pressure amplitudes acquired by the pressure amplitude acquiring unit into a first section prior to a maximum in-cylinder pressure and a second section subsequent to the maximum in-cylinder pressure; and a determining unit that determines whether knocking has occurred, by comparing a first maximum amplitude of the pressure amplitude in the first section with a second maximum amplitude of the pressure amplitude in the second section.