Coupling Brake Hydraulic Circuit for Modulated Emergency Parking
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Solution Overview
Problem
Regulation EU 2015/68 poses challenges for implementing parking brake and emergency brake functions in vehicles equipped with a coupling, particularly in ensuring zero pressure in the supplementary line when the parking brake is actuated and modulatable braking when the vehicle speed is greater than 40 km/h, especially when the emergency brake function is fulfilled by the parking brake.
Innovation Solution
A method and system where the pressure in the control line and supplementary line are driven based on a setpoint applied to the parking brake, with specific pressure conditions defined by C1, C2, and C3 values, allowing for zero pressure, constant non-zero pressure, and proportional braking pressure, adaptable to the wear of the hydraulic braking system, and controlled by a computer via valves to manage the braking system effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the parking brake is used to fulfill the emergency brake function, then the device complexity is reduced, but the ability to generate modulatable braking on the trailer is worsened
Solution Approach 1:
The patent applies dynamics by making the braking pressure adaptable and variable through electronic control. The control unit dynamically adjusts the braking pressure in the control line based on vehicle speed and braking demand, enabling the parking brake to provide modulatable braking on the trailer while maintaining system simplicity. This resolves the contradiction by allowing a single brake system to perform multiple functions through dynamic control rather than requiring separate fixed-function brake systems.
Solution Approach 2:
The patent changes the parameter of braking pressure from fixed to variable through electronic control. By using a control unit that adjusts pressure based on vehicle speed (particularly above 40 km/h) and braking demand, the system enables modulatable braking on the trailer using the parking brake infrastructure. This parameter change allows one brake system to fulfill multiple regulatory requirements without increasing device complexity.
2Force
If the parking brake is actuated to maximum, then the braking force on the vehicle is improved, but the pressure in the supplementary line must be zero which limits coupling brake control
Solution Approach 1:
The patent segments the braking control into two independent lines: the control line and the supplementary line. The control line receives dynamic pressure control from the control unit for modulated braking, while the supplementary line maintains its independent pressure supply for coupling brake control. This segmentation allows the parking brake to be actuated to maximum for strong vehicle braking while the supplementary line pressure can be independently managed to control the coupling brakes, resolving the contradiction between braking force and coupling control versatility.
Solution Approach 2:
The control unit acts as an intermediary that manages the interaction between the parking brake actuation and the supplementary line pressure. When the parking brake is applied, the control unit coordinates the pressure distribution between the control line and supplementary line, ensuring that coupling brakes can still be controlled through the supplementary line while the vehicle receives the required braking force. This intermediary control resolves the conflict between maximum braking force and coupling brake control capability.
3Device complexity
If a fixed pressure is supplied by the pump in the supplementary line, then the system simplicity is improved, but the ability to provide modulatable braking above 40 km/h is worsened
Solution Approach 1:
The patent applies dynamics by making the braking pressure adaptable and variable through electronic control. The control unit dynamically adjusts the braking pressure in the control line based on vehicle speed and braking demand, enabling the parking brake to provide modulatable braking on the trailer while maintaining system simplicity. This resolves the contradiction by allowing a single brake system to perform multiple functions through dynamic control rather than requiring separate fixed-function brake systems.
Solution Approach 2:
The patent replaces the traditional mechanical pressure supply system with an electronically controlled system. Instead of using a mechanical pump with variable displacement or multiple pressure stages, the system uses a control unit with electronic sensors and actuators to dynamically adjust pressure in the control line. This substitution of mechanical complexity with electronic control achieves speed-dependent modulated braking while keeping the overall system simple and cost-effective.
Data Source
AI summary
A method for driving a parking brake of a vehicle (V) wherein:for a setpoint between 0 and C1, the control pressure (200) is zero, and the supplementary pressure (100) is non—zero constant;for a setpoint between C1 and C3, the control pressure is proportional to the setpoint,for a setpoint between C2 and Cmax, the supplementary pressure is zero;said values being such that0<C1<C2<Cmax, and0<C1<C3<Cmax.