Dynamic Braking Force Control for Road Laying Vehicles
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Solution Overview
Problem
Conventional braking systems in vehicles with tippable load compartments, used in conjunction with road laying machines, often require manual adjustments by the driver to maintain speed due to insufficient braking force, especially when additional deceleration is needed during road surfacing operations.
Innovation Solution
An electronic braking system with a braking demand input device, such as a brake pedal, and an electronic braking control unit that adjusts the braking force dynamically by generating a brake operation signal to increase the braking force when the driver actuates and releases the pedal, allowing for easy adjustment of braking force without manual intervention at a diagnostic display unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed low level braking force is applied to maintain constant speed during road laying operations, then the vehicle speed remains stable, but the braking force may be insufficient to prevent speed increases when additional deceleration is needed
Solution Approach 1:
The braking system transitions from a static fixed braking force to a dynamic adjustable braking force. The electronic braking control unit enables the driver to incrementally increase braking force by pressing the brake pedal, allowing the braking force to adapt dynamically to varying operational conditions and maintain reliable speed control.
Solution Approach 2:
The system incorporates feedback through the brake pedal input device that provides real-time information to the electronic braking control unit. When the driver presses the pedal, the control unit receives this feedback and automatically increases the braking force accordingly, eliminating the need for manual intervention at diagnostic display units.
2Force
If the driver manually adjusts the regulator through the EBS diagnostic display unit to increase braking force, then additional braking force can be achieved, but the operation becomes complex and time-consuming
Solution Approach 1:
The electronic braking control unit performs the braking force adjustment automatically based on driver input through the simple brake pedal. The system serves itself by translating the driver's pedal input into the appropriate braking force output, eliminating the need for the driver to manually navigate complex diagnostic display interfaces or adjust regulators.
Solution Approach 2:
The complex mechanical adjustment process involving manual regulator adjustment through diagnostic displays is replaced with an electronic control system. The electronic braking control unit processes the driver's pedal input and automatically adjusts the braking force, substituting manual mechanical operations with automated electronic control.
3Ease of operation
If the brake pedal is made easily accessible in the driver's cab, then the driver can quickly adjust braking force, but the brake pedal may interfere with the driver's normal braking operations
Solution Approach 1:
The system uses partial action by implementing a threshold-based response. When the driver presses the brake pedal, the electronic braking control unit determines whether the input represents a request for additional braking force or normal emergency braking based on the context and magnitude of the input, applying incremental braking force only when appropriate while preserving normal braking functionality.
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
Enables the driver to maintain a constant speed during road laying operations by incrementally increasing the braking force as needed, ensuring efficient control over vehicle speed without the need for additional manual adjustments, thereby preventing speed increases.
Implementation Method 1
an electronic braking control unit which receives an electrical input signal representative of the level of vehicle braking indicated by the braking demand signal and which generates an appropriate brake operation output signal for transmission to at least one brake actuator assembly
Implementation Method 2
transmission of a brake operation output signal to a brake actuator assembly causing a brake to operate to apply a braking force to the vehicle
Data Source
AI summary
A vehicle (10) having a braking system comprising a braking demand input device (30) which is operable by a driver to generate a braking demand signal indicative of the level of vehicle braking required, an electronic braking control unit (32) which receives an electrical input signal representative of the level of vehicle braking indicated by the braking demand signal and which generates an appropriate brake operation output signal for transmission to at least one brake actuator assembly (34, 38), transmission of a brake operation output signal to a brake actuator assembly (34, 38) causing a brake to operate to apply a braking force to the vehicle (10), wherein the vehicle (10) also comprises a switch (40) which is connected to the electronic braking control unit (32) and which is operable to transmit a signal to the electronic braking control unit (32) which causes the electronic braking control unit (32) to transmit a brake operation output signal to the brake actuator assembly (34, 38), the brake operation signal causing the brake actuator assembly (34, 38) to apply a low level braking force to the vehicle (10), characterised in that the braking system is further configured such that during the application of the low level braking force, operation of the braking demand input device causes the electronic braking control unit (32) to modify the brake operation signal so as to increase the braking force by a predetermined amount.