Brake Pressure Control via Deceleration Angle for Two-Wheeled Vehicles
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Solution Overview
Problem
Current brake pressure control systems in two-wheeled vehicles often increase braking distance and risk of rollover, as they reduce front wheel braking force to prevent rear wheel lift-off, leading to engine drag torque issues on uneven surfaces.
Innovation Solution
The method involves determining current deceleration in the longitudinal and normal force directions using acceleration sensors to set brake pressure in the front wheel braking device, limiting the deceleration angle to prevent rear wheel lift-off while maintaining safety reserves, allowing higher deceleration values and shorter braking distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake pressure on the front wheel is reduced to prevent rear wheel lift-off, then rollover risk is prevented, but braking distance increases
Solution Approach 1:
The system changes the parameter for determining rear wheel lift-off from wheel speed comparison to deceleration angle measurement. By measuring the angle between the longitudinal deceleration vector and the resulting deceleration vector, the system can more accurately detect actual lift-off events, allowing for more precise brake pressure control that prevents rollover while maintaining shorter braking distances.
Solution Approach 2:
The patent replaces the mechanical/wheel-speed-based detection system with an acceleration sensor-based system that measures deceleration vectors. This substitution enables more accurate and responsive detection of rear wheel lift-off, allowing the control system to maintain optimal brake pressure without excessive reduction, thus shortening braking distance while preventing rollover.
2Reliability
If brake pressure is reduced on uneven road surfaces to account for potential lift-off, then rollover risk is mitigated, but braking performance deteriorates
Solution Approach 1:
The system changes from using wheel speed differential as the detection parameter to using deceleration angle as the detection parameter. This parameter change enables the system to distinguish between actual rear wheel lift-off and normal wheel movement on uneven surfaces, allowing brake pressure to be maintained for optimal braking performance while only reducing pressure when actual lift-off occurs.
Solution Approach 2:
The system uses continuous feedback from acceleration sensors to monitor the deceleration angle in real-time. This feedback mechanism allows the control system to respond only to actual lift-off events rather than applying conservative brake pressure reduction on all uneven surfaces, thus maintaining braking performance while preventing rollover.
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 enables shorter braking distances with sufficient safety reserves to avoid rollover, by accurately distinguishing between rear wheel lift-off and road unevenness, and adjusting brake pressure accordingly.
Implementation Method 1
the current deceleration in the longitudinal direction of the vehicle and in the normal force direction is determined, and that the brake pressure in the front-wheel braking device is set depending on the current deceleration
Data Source
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AI summary
In a method for brake pressure regulation in two-wheeled vehicles, the present deceleration in the vehicle longitudinal direction and in the normal force direction is measured by means of acceleration sensors. The deceleration vectors are added vectorially to form a resultant deceleration vector, wherein the angle between the resultant deceleration vector and the longitudinal deceleration vector is determined. The brake pressure in the front wheel brake device is adjusted in such a way that the angle does not exceed a predefined limit value.