Motorcycle Chassis Dynamometer Flow Unit Airflow Simulation
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Solution Overview
Problem
Conventional chassis dynamometers for motorcycles with combustion engines are not dynamic, space-saving, or cost-effective, and they fail to accurately simulate real driving conditions, especially in terms of air resistance and dynamic pressure.
Innovation Solution
A chassis dynamometer with a flow unit that includes a drive unit, a diffuser, and an outflow unit, where the diffuser is driven to generate a gas flow that matches the peripheral speed of the motorcycle's rear wheel, simulating air resistance and dynamic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional chassis dynamometer is used, then the motorcycle can be tested in a fixed location, but it cannot simulate air resistance and dynamic pressure accurately
Solution Approach 1:
The patent introduces a flow unit as an intermediary device that generates artificial airflow to simulate the dynamic pressure and air resistance conditions. This flow unit acts as a mediator between the stationary motorcycle and the required airflow conditions, creating a controlled environment that replicates real-world driving scenarios without requiring the motorcycle to move at high speeds.
Solution Approach 2:
The invention employs pneumatic principles by using a flow unit to generate and control airflow around the motorcycle. The flow unit creates pressurized air streams that simulate the dynamic pressure conditions experienced during high-speed travel, enabling accurate testing of aerodynamic components and engine performance under controlled pneumatic conditions.
2Reliability
If a wind tunnel is used to simulate air resistance, then air flow conditions can be reproduced, but it requires a lot of space and is costly
Solution Approach 1:
The patent extracts only the essential function of a wind tunnel (airflow generation) and implements it through a compact flow unit. Instead of using a full-scale wind tunnel infrastructure, the invention isolates and reproduces the critical airflow characteristics needed for testing, thereby achieving wind tunnel functionality in a space-efficient manner.
Solution Approach 2:
The invention transitions from the traditional three-dimensional wind tunnel environment to a more compact configuration by using targeted airflow jets from the flow unit. This dimensional change allows the system to achieve similar aerodynamic testing capabilities in a reduced spatial footprint by concentrating airflow in specific directions and zones.
3Reliability
If a wind tunnel is used, then air flow can be simulated, but it cannot produce quick changes in air flow
Solution Approach 1:
The flow unit is designed with dynamic control capabilities that allow rapid adjustment of airflow parameters. The system can quickly change air flow conditions in response to varying motorcycle speeds and testing requirements, providing real-time adaptability that static wind tunnel configurations cannot match. This dynamic response enables the system to closely follow the actual driving conditions throughout the testing process.
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 solution provides a dynamic, space-saving, and cost-effective means to simulate real driving conditions, allowing for accurate tuning of motorcycle units by replicating air resistance and dynamic pressure, thereby enhancing performance and safety.
Implementation Method 1
the diffuser can be driven by the drive unit, wherein the control unit controls the drive unit as a function of the peripheral speed of the roller
Data Source
AI summary
A chassis dynamometer for motorcycles with a combustion engine, having a mounting unit, at least one fastening unit, an operating unit, a control unit and a roller for recording the peripheral speed of a motorcycle rear wheel is disclosed. The chassis dynamometer has a flow unit a drive unit, a diffuser and an outflow unit arranged downstream of the diffuser in the direction of flow where the diffuser and outflow unit form a flow channel carrying gas in the operating state, wherein the diffuser can be driven by the drive unit, where the control unit controls the drive unit as a function of the peripheral speed of the roller in such a way that a speed of the gas emerging from the outflow unit in the operating state is substantially equal to the peripheral speed at least from a peripheral speed of 150 km/h.