Pre-Chamber Spark Plug Multi-Discharge Ignition for Stronger Flame Jets
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Solution Overview
Problem
The existing spark plugs with auxiliary combustion chambers face limitations in ignition performance, leading to suboptimal flame jet ejection into the main combustion chamber, which affects combustion efficiency in internal combustion engines.
Innovation Solution
An ignition apparatus with a spark plug, ignition coil, and controller that employs a multiple-discharge mode, generating discharge at least twice with a pause period between discharges across the discharge gap from the compression stroke to the expansion stroke, enhancing ignition performance by integrating initial flames in the auxiliary combustion chamber and improving flame jet ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single discharge is generated across the discharge gap in the auxiliary combustion chamber, then the structure is simple and operation is straightforward, but the ignition performance is insufficient and combustion efficiency is suboptimal
Solution Approach 1:
The controller generates discharge across the discharge gap multiple times (at least twice) within one engine cycle, with discharge pause periods intervening between discharges. This periodic discharge action creates multiple initial flames that integrate to form a stronger flame jet, improving ignition performance without requiring structural modifications to the spark plug itself.
2Reliability
If discharge is generated continuously without pause periods, then ignition occurs quickly, but flame integration is insufficient and combustion efficiency remains suboptimal
Solution Approach 1:
The discharge pause period serves as a preliminary integration phase where multiple initial flames generated by separate discharge events can merge and strengthen each other. This intentional pause allows the flame kernel to develop and integrate before the main combustion phase, ensuring more efficient combustion without excessive time loss.
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
This configuration improves ignition performance in the auxiliary combustion chamber, resulting in enhanced flame jet ejection into the main combustion chamber, thereby increasing combustion efficiency in internal combustion engines.
Implementation Method 1
The ignition coil is configured to apply a voltage to the spark plug. The controller is configured to perform a multiple-discharge mode in which discharge is generated at least twice, with a discharge pause period intervening therebetween, across the discharge gap
Implementation Method 2
an air-fuel mixture in the auxiliary combustion chamber is ignited by discharge generated across a discharge gap formed within the auxiliary combustion chamber. Then, the flame formed in the auxiliary combustion chamber is ejected as a flame jet into a main combustion chamber
Data Source
AI summary
Disclosed is an ignition apparatus for an internal combustion engine. The ignition apparatus includes a spark plug, an ignition coil and a controller. The spark plug has an auxiliary combustion chamber in which a discharge gap is arranged. The ignition coil is configured to apply a voltage to the spark plug. The controller is configured to perform a multiple-discharge mode in which discharge is generated at least twice, with a discharge pause period intervening therebetween, across the discharge gap within a period from a compression stroke to an expansion stroke of the internal combustion engine.