Electric Motorcycle Speaker Placement for Pedestrian Warning
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Solution Overview
Problem
Electric motorcycles produce a weak driving sound, making it difficult for pedestrians to detect their approach, and existing vehicle approach notification systems for four-wheeled vehicles are not optimally adapted for electric motorcycles with limited space.
Innovation Solution
A vehicle approach notification apparatus for electric motorcycles with strategically positioned speakers, including one above the head pipe and another below the seat, utilizing sound guiding ducts and a cover member with variable sound holes to enhance sound pressure and directionality, ensuring effective notification without interfering with other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a speaker is attached to the front of an electric motorcycle to notify pedestrians, then the notification effect is improved, but the available space is limited due to the motorcycle's compact front structure
Solution Approach 1:
The speaker is positioned on the head pipe which extends vertically, utilizing the vertical dimension rather than horizontal space. This allows the speaker to be mounted at a height that provides good sound projection to pedestrians while fitting within the compact front structure of the motorcycle.
Solution Approach 2:
The speaker is specifically positioned on the head pipe structure, utilizing this particular location's spatial characteristics. The head pipe provides a suitable mounting position that is elevated enough for effective sound notification while being integrated into the existing motorcycle frame without requiring additional space.
2Reliability
If a large speaker is used to enhance notification effect, then the sound pressure is improved, but the speaker size is constrained by the limited space on the electric motorcycle
Solution Approach 1:
The position parameters of the speaker are optimized by mounting it on the head pipe at a specific height and angle. This positional parameter change allows a small speaker to achieve effective sound pressure at pedestrian ear level, compensating for the limited speaker size through strategic positioning rather than relying on large speaker dimensions.
3Reliability
If the speaker is positioned high to improve notification coverage, then the notification range is improved, but the speaker may interfere with other components like the front carrier or luggage
Solution Approach 1:
The front structure is segmented into functional zones: the head pipe area for the speaker, the front carrier area for luggage, and the leg shield area for structural support. This segmentation allows each component to occupy its designated space without interference, with the speaker on the head pipe positioned above the front carrier but below the handlebars, ensuring both notification effectiveness and component compatibility.
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
The apparatus provides a high notification effect by directing sound to the rear and sides, ensuring pedestrians can hear the approaching electric motorcycle, even with a small speaker size, and allows for flexible installation without disturbing other features like luggage or steering operations.
Implementation Method 1
a speaker (60) attached to a vehicle body, wherein the notification sound for notifying an individual
Implementation Method 2
emitting sound from the second speaker (70) to be reflected at least to a vehicle body sideward direction by a leg shield (10)
Data Source
AI summary
An electric motorcycle includes a front cover for covering a head pipe of a vehicle body frame from a forward direction and a speaker for notifying an individual, such as a walker or the like, of the approach of a vehicle. The speaker has a sound emitting direction directed forwardly on the vehicle body and is disposed at a position on the opposite side to a key cylinder of a main switch, which is disposed in a vehicle body sideward direction of the head pipe, across the head pipe. A front stay support a front carrier disposed on the vehicle body front side of the front cover and is attached to the vehicle body front side of the head pipe is provided on the vehicle body rear side of the front cover. The speaker is disposed above the front stay as viewed in front elevation of the vehicle body.