Multipoint Ignition Electrode Heat Value Control
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Solution Overview
Problem
The existing multipoint ignition devices face issues with electrode pair temperature regulation, leading to carbon deposition and secondary voltage leakage at low temperatures, and pre-ignition at high temperatures, resulting in pollution and inefficiencies.
Innovation Solution
The solution involves adjusting the heat values of electrode pairs in a multipoint ignition device by varying the contact area between intermediate members and the head gasket, using modifications such as altering dimensions and surface processing to optimize heat radiation properties, ensuring temperatures remain within a suitable range of 450°C to 1000°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the temperature of the electrode pair is kept low to prevent pre-ignition, then the electrode pair does not become a heat source, but carbon sticks to the electrode pair causing pollution and secondary voltage leakage
Solution Approach 1:
The patent applies local quality by giving each electrode pair a customized heat value tailored to its specific disposal position within the combustion chamber. Electrode pairs at different locations experience different thermal environments, so each is assigned a heat value (through intermediate member design) that is locally optimized for its position, preventing both carbon deposition and pre-ignition at that specific location.
Solution Approach 2:
The patent changes the heat value parameter of each electrode pair by varying the contact area between intermediate members and the electrode pairs. By adjusting this contact area, the heat radiation properties of each electrode pair are modified to achieve the optimal temperature range (450°C to 1000°C) for preventing carbon deposition while avoiding pre-ignition.
2Object-generated harmful factors
If the temperature of the electrode pair is raised above 1000°C to ensure self-cleaning, then carbon deposition is prevented, but the electrode pair becomes a heat source causing pre-ignition
Solution Approach 1:
The patent prevents overheating by locally optimizing each electrode pair's heat value according to its position. This ensures that no electrode pair exceeds the safe temperature threshold that would cause pre-ignition, while still maintaining sufficient temperature for self-cleaning where needed.
Solution Approach 2:
The patent controls the temperature parameter by adjusting the heat value of each electrode pair through modified intermediate members. By changing the contact area, the heat radiation is optimized to keep temperatures below 1000°C and prevent pre-ignition while maintaining enough heat for carbon removal.
3Ease of manufacture
If a uniform heat value is applied to all electrode pairs, then manufacturing is simplified, but electrode pairs at different positions cannot maintain optimal temperatures
Solution Approach 1:
The patent segments the heat value specification into individual electrode pairs rather than applying a uniform value. Each electrode pair is assigned a specific heat value through its intermediate member design, allowing customized temperature control for each position while maintaining relatively simple manufacturing through standardized intermediate member variations.
Solution Approach 2:
The patent implements local quality by optimizing the heat value of each electrode pair according to its specific disposal position. This ensures that electrode pairs in different thermal environments maintain appropriate temperatures, improving reliability while the variations in intermediate members remain manageable for manufacturing.
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 prevents pollution and pre-ignition by maintaining optimal electrode pair temperatures, enhancing engine performance and fuel efficiency.
Implementation Method 1
Respective heat values of the plurality of electrode pairs are set individually by varying a contact area between the plurality of intermediate members and the interposed member
Data Source
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AI summary
A multipoint ignition device comprises: a head gasket (1) interposed between a cylinder head and a cylinder block of an engine, having an opening (3) in a position corresponding to a cylinder opening portion; and a plurality of intermediate members (6) connected respectively to a plurality of electrode pairs (2) and held in the head gasket (1). Respective heat values of the plurality of electrode pairs (2) are set individually by varying the contact area between the plurality of intermediate members (6) and the head gasket (1) according to the respective disposal positions of the plurality of intermediate members (6).