Pre-Chamber Engine Control for Scavenging Burnt Gas
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Solution Overview
Problem
The pre-chamber type internal combustion engine faces issues with scavenging performance due to burnt gas stagnation in the pre-combustion chamber, leading to weakened combustion and potential misfires, which existing hardware adjustments cannot effectively address due to variations in engine shape and operational conditions.
Innovation Solution
A control device and method that utilize a first control device for generating spark discharge in the pre-combustion chamber for combustion and a second control device to promote scavenging by generating additional spark discharges at specific timings and intervals to efficiently exhaust burnt gas, leveraging resonance effects to enhance scavenging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pre-chamber type engine configuration is used to improve thermal efficiency, then combustion performance is improved, but burnt gas stagnation occurs in the pre-combustion chamber
Solution Approach 1:
The patent applies mechanical vibration by generating vibration at the spark plug electrode to agitate and discharge burnt gas from the pre-combustion chamber. The vibration unit causes the electrode to vibrate, creating turbulent flow that prevents burnt gas accumulation and promotes fresh air-fuel mixture circulation, thereby resolving the stagnation problem while maintaining the pre-chamber combustion efficiency
Solution Approach 2:
The patent implements periodic action through controlled spark discharge timing and vibration cycles. The spark plug operates at specific intervals to ignite the fuel mixture, and the vibration is applied periodically during the combustion cycle to continuously expel burnt gas. This periodic operation maintains combustion performance while preventing harmful gas accumulation
2Manufacturing precision
If hardware adjustments are made to optimize combustion, then combustion performance is improved, but adaptability to varying engine conditions is limited
Solution Approach 1:
The patent transitions from static hardware optimization to dynamic control by introducing a vibration unit and control unit. These components enable real-time adjustment of combustion parameters based on actual engine operating conditions, allowing the system to adapt to varying loads, speeds, and temperatures while maintaining optimized combustion performance
Solution Approach 2:
The control unit monitors engine operating conditions and adjusts the vibration frequency and spark discharge timing accordingly. This feedback mechanism allows the system to respond to changes in engine state, optimizing combustion for each specific condition rather than relying on fixed hardware configurations
3Object-generated harmful factors
If additional spark discharges are generated for scavenging, then burnt gas is effectively removed, but energy consumption increases
Solution Approach 1:
The patent applies partial action by generating vibration and additional spark discharges only during specific portions of the combustion cycle when burnt gas removal is most needed. The vibration is applied during the exhaust and intake strokes rather than continuously, and spark discharge is timed to coincide with scavenging phases, reducing overall energy consumption while maintaining effective burnt gas removal
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 approach effectively scavenges burnt gas from the pre-combustion chamber, maintaining combustion performance and reducing greenhouse gas emissions, thereby improving thermal efficiency and engine stability.
Implementation Method 1
combustion of fuel gas introduced into the pre-combustion chamber by spark discharge generated at the spark plug with the high voltage provided from the ignition coil
Implementation Method 2
combustion flame is jetted from the orifice to a main combustion chamber, to ignite fuel in the main combustion chamber
Implementation Method 3
A control device and method that utilize a first control device for generating spark discharge in the pre-combustion chamber for combustion and a second control device to promote scavenging by generating additional spark discharges at specific timings and intervals to efficiently exhaust burnt gas, leveraging resonance effects to enhance scavenging performance
Data Source
AI summary
An object is to improve scavenging performance of a pre-combustion chamber connected to a main combustion chamber via an orifice and suppress reduction in combustion performance of an internal combustion engine. This control device for an internal combustion engine including a main combustion chamber and a pre-combustion chamber having at least one orifice between the pre-combustion chamber and the main combustion chamber, includes a first control device which controls operation of an ignition coil to generate spark discharge at a spark plug, thus combusting fuel gas, and a second control device which controls operation of the ignition coil at a timing other than the timing of combusting the fuel gas, to promote scavenging of the pre-combustion chamber.