Motorcycle Brake Control Device with Dynamic ABS Threshold
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Solution Overview
Problem
In motorcycle brake control systems with ABS, strong pedal operation is required to apply additional braking force to the front wheel when the rear wheel is locked, which can lead to excessive force needed for vehicle attitude control, compromising braking performance.
Innovation Solution
A brake control device with a front-wheel and rear-wheel interlocking brake system using a brake-by-wire system, where hydraulic pressure is applied to both wheels based on the operational force of the rear-wheel brake pedal, with distinct pressure thresholds for ABS active and inactive states, allowing for optimized braking performance without excessive pedal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake pedal is pushed strongly to exceed the threshold for high hydraulic pressure to apply front-wheel braking force, then front-wheel braking is achieved, but the pedal force required becomes excessive and compromises vehicle attitude control
Solution Approach 1:
The patent implements dynamic adjustment of the interlocking brake starting pressure value based on ABS operational status. When ABS is active (rear wheel locked), the threshold is lowered to a first pressure value, enabling front-wheel brake activation at lower pedal forces. When ABS is inactive, a higher second pressure value is used to maintain normal braking characteristics. This dynamic threshold adjustment resolves the contradiction by adapting the system response to current wheel conditions.
Solution Approach 2:
The control device continuously monitors wheel speed to detect ABS activation status and uses this feedback to adjust the interlocking brake starting pressure value. When rear wheel speed indicates locking (ABS active), the system automatically lowers the pressure threshold for front-wheel brake engagement. This feedback mechanism ensures the system responds appropriately to actual wheel conditions, enabling effective front-wheel braking without excessive pedal force during ABS events.
2Reliability
If the interlocking brake starting pressure value is set high to maintain normal braking characteristics, then vehicle attitude control is preserved, but front-wheel braking cannot be activated when ABS is active
Solution Approach 1:
The system dynamically changes the interlocking brake starting pressure value based on real-time ABS status detection. Two distinct pressure thresholds are maintained: a first pressure value for ABS-active conditions and a second pressure value for normal braking. This dynamic adaptation allows the system to provide appropriate braking response for each operational mode, resolving the contradiction between maintaining reliable braking characteristics and adapting to ABS conditions.
Solution Approach 2:
The patent changes the pressure parameter (interlocking brake starting pressure value) based on ABS operational state. When rear wheel locking is detected, the pressure threshold parameter is switched from the second value to the first value, enabling front-wheel brake activation at lower pressures. This parameter change allows the system to maintain reliable braking performance while adapting to different operational requirements.
3Ease of operation
If the front-wheel brake caliper pressure starts working only after pedal input hydraulic pressure reaches a predetermined high hydraulic pressure, then rear-wheel brake alone is actuated for vehicle body attitude control, but no larger braking force can be applied to the rear wheel when ABS is active
Solution Approach 1:
The system dynamically adjusts the interlocking brake starting pressure value based on ABS status. When ABS is active and rear-wheel braking force is insufficient, the lowered first pressure value enables automatic front-wheel brake engagement at lower pedal input pressures, providing additional braking force without requiring the driver to push the pedal beyond normal attitude control ranges.
Solution Approach 2:
The control device uses wheel speed feedback to detect when rear wheel locking occurs and ABS activation is required. Based on this feedback, the system automatically lowers the pressure threshold for front-wheel brake engagement, enabling timely front-wheel braking assistance without requiring excessive pedal force from the driver.
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
Enhances braking performance by allowing front-wheel braking without excessive pedal force during ABS activation, improving vehicle control and reducing the risk of rear tire locking, while maintaining cost-effectiveness and ease of optimization.
Implementation Method 1
a hydraulic pressure modulator configured to increase or decrease hydraulic pressure to the brake caliper based on the wheel speed
Implementation Method 2
a brake caliper configured to apply a braking force to a brake disc
Data Source
AI summary
To prevent deterioration of sports driving performance due to the actuation of an ABS in a front-wheel and rear-wheel interlocking brake system of a brake-by-wire system. A brake interlock determining portion starts a front-wheel brake when input hydraulic pressure by a brake operation (pedal operation) on a rear-wheel becomes equal to or greater than an interlocking brake starting pressure value. A threshold selecting switch allows switching of the interlocking brake starting pressure value between when the ABS is active and when the ABS is inactive. When the ABS is active, a lower pressure value is selected as the interlocking brake starting pressure value. When the ABS is inactive, an upper pressure value is selected as the interlocking brake starting pressure value.