Motorcycle Exhaust Thrust Nozzle for Anti-Rearing Control
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Solution Overview
Problem
Existing systems for motorcycles fail to maintain both wheels on the ground while increasing torque, and they do not enable greater acceleration without causing the front wheel to lift during high torque production, as they either reduce torque or do not provide a mechanism to unload engine power effectively without tilting.
Innovation Solution
A system at the terminal part of the exhaust pipe that partiallyizes the outlet area of exhaust gases, using a tubular body with movable petals to control the flow and generate opposing forces, while maintaining the flow centered on a median axis, allowing for increased torque and acceleration without tilting, by using an electric motor to adjust the passage area based on engine power and vehicle position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the torque produced by the engine is increased to achieve greater acceleration, then the acceleration thrust of the vehicle is improved, but the front wheel lifts from the ground causing rearing and tilting
Solution Approach 1:
The patent converts the harmful exhaust gases into a beneficial force by directing them through a nozzle to generate thrust. The exhaust flow, which would otherwise be wasted, is now used to create a forward thrust component that helps accelerate the vehicle without causing rearing. The exhaust thrust vector is angled to provide both forward propulsion and a downward component that presses the rear wheel against the ground, preventing front wheel lift.
Solution Approach 2:
The system activates the exhaust thrust mechanism before the rearing condition occurs. By monitoring vehicle dynamics and engine parameters, the control system adjusts the exhaust flow direction and magnitude in advance to counteract the tendency toward front wheel lift, allowing the engine to operate at higher torque levels without causing instability.
2Stability of the object's composition
If the number of engine revolutions is limited to prevent rearing, then the vehicle stability is maintained, but the acceleration thrust and torque are reduced
Solution Approach 1:
Instead of limiting engine power output, the system converts the harmful exhaust into useful thrust. This allows the engine to operate at higher revolutions and produce maximum torque while the exhaust thrust mechanism compensates for the rearing effect, eliminating the need to restrict engine power.
Solution Approach 2:
The exhaust thrust nozzle acts as an intermediary between the engine and the ground. It takes the engine's exhaust energy and transforms it into a controlled thrust force that mediates between the engine's tendency to cause rearing and the need for maximum power output, allowing both high torque and stability to coexist.
3Productivity
If the outlet area of exhaust gases is increased to improve exhaust flow, then the engine breathing is improved, but the thrust generation capability is reduced
Solution Approach 1:
The system dynamically changes the parameters of the exhaust system by using an adjustable nozzle that can modify its opening area and angle. This allows optimization of both exhaust flow and thrust generation: when thrust is needed, the nozzle constricts to increase velocity and directional force; when engine breathing is the priority, the nozzle opens wider to reduce backpressure while still maintaining some thrust capability.
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 system allows for higher accelerations and greater torque without lifting the front wheel, by generating additional thrust that opposes tilting and increases acceleration, while maintaining the vehicle on the ground, without structural modifications to the motorcycle.
Implementation Method 1
a system enabling opposing the tendency of the vehicle to rear i.e. opposing the tendency of the front wheel to lift from the ground when power is unloaded onto the ground with the rear wheel
Data Source
AI summary
A motorcycle including a frame to which an internal combustion engine is associated, from which internal combustion engine at least one exhaust pipe of combusted gases departs, the exhaust pipe having an open terminal, the frame mounted on a front wheel and a rear wheel, a control board or unit included, for controlling torque produced by the engine and other parameters such as velocity of the vehicle and spatial position thereof with respect to the road surface. The motorcycle including a system to verify when the front wheel of the motorcycle detaches from the road surface during acceleration. The system includes a choke for partializing the section of the exhaust gases outlet area from the exhaust pipe, during partialization. The partialization obtained as a function of the torque produced by the engine and the position of the front wheel with respect to the road surface.