Motorcycle Ignition Coil Mounting for Vibration and Sensor Noise
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Solution Overview
Problem
In straddled vehicles with engines fixed to the body frame, the existing ignition coil is not supported by the engine, leading to differences in vibration between the ignition coil and the spark plug, which can affect the detection accuracy of the magnetic sensor and increase radio noise.
Innovation Solution
The ignition coil is supported by the head cover of the engine, with the spark plug attached to the cylinder head, effectively suppressing the difference in vibration between the ignition coil and the spark plug. Additionally, the throttle device is located behind the cylinder head, and the supporting portion electrically connects the head cover to the flange, reducing radio noise and protecting the magnetic sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the ignition coil is supported by the body frame, then the ignition coil is isolated from engine heat and vibration, but vibration difference between ignition coil and spark plug increases
Solution Approach 1:
The patent segments the support function by introducing a dedicated ignition coil support structure that is separate from both the engine and body frame, allowing the ignition coil to be positioned optimally for both thermal isolation and vibration synchronization
Solution Approach 2:
The patent introduces an intermediary support structure (ignition coil support) that mediates between the engine and body frame, providing both thermal isolation and vibration damping while maintaining proper ignition timing
2Temperature
If the ignition coil is supported by the body frame, then engine heat is not transferred to ignition coil, but magnetic sensor detection accuracy decreases
Solution Approach 1:
The patent extracts the magnetic sensor from the throttle device and positions it separately, away from the ignition coil, eliminating the harmful magnetic interference while maintaining its detection function
Solution Approach 2:
The patent introduces spatial separation as an intermediary measure, positioning the magnetic sensor away from the ignition coil to prevent magnetic field interference while maintaining detection accuracy
3Stability of the object's composition
If the ignition coil is supported by the body frame, then vibration of engine is not transferred to ignition coil, but radio noise increases
Solution Approach 1:
The patent introduces a dedicated ignition coil support structure as an intermediary that provides both mechanical stability and electrical grounding, reducing radio noise while maintaining ignition coil stability
Solution Approach 2:
The patent replaces the mechanical body frame support with a specialized support structure that incorporates both mechanical and electrical functions, reducing radio noise through proper grounding and shielding
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 allows for a more appropriate arrangement of the ignition device, suppressing vibration differences and protecting the magnetic sensor from both the ignition coil and radio noise, resulting in improved detection accuracy and reduced radio interference.
Implementation Method 1
a magnetic sensor configured to detect a position of the throttle valve
Implementation Method 2
an ignition coil connected to the plug cord... The ignition coil includes a casing, a secondary terminal, and a flange
Data Source
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AI summary
There is disclosed a straddled vehicle (1) including a body frame (3), an engine (11), a throttle device (41), an ignition device (61), and a supporting portion (81). The engine (11) includes a cylinder head (26), and a head cover (29). The throttle device (41) is located behind the cylinder head (26). The throttle device (41) includes a magnetic sensor (46). The ignition device (61) includes a spark plug (63), and an ignition coil (67). The spark plug (63) is attached to the cylinder head (26). At least part of the ignition coil (67) is located in front of a cylinder axis (B) in side view of the vehicle. The ignition coil (67) includes a flange (73). The supporting portion (81) supports the ignition coil (67). The supporting portion (81) is supported by the head cover (29). The supporting portion (81) electrically connects the head cover (29) to the flange (73).