Vehicle Long-Term Braking System Torque Splitting
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Solution Overview
Problem
Conventional continuous braking systems for motor vehicles lack the ability to optimally adapt braking torque to current requirements, leading to inefficient heat input into the engine cooling system and excessive noise, particularly due to the inability to regulate braking power and the reliance on speed-dependent secondary retarders.
Innovation Solution
A method for dividing a retarder braking request into adjustable portions for both primary and secondary retarders, where the primary retarder handles the initial braking torque up to a threshold value, minimizing heat input and noise, and the secondary retarder takes over when the threshold is exceeded, allowing for precise regulation of braking torque components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If only a secondary retarder is used for continuous braking, then braking torque can be regulated, but heat input into the engine cooling system increases and noise develops
Solution Approach 1:
The braking system is divided into two independent retarders: a primary retarder (engine brake) and a secondary retarder (hydrodynamic or electromagnetic brake). Each retarder can be controlled independently to share the braking torque demand, allowing the system to utilize the primary retarder's advantage of lower heat input and noise while maintaining the secondary retarder's braking capability when needed.
2Speed
If a primary retarder with two parts having different speeds is used, then response time is improved, but device complexity increases
Solution Approach 1:
Instead of complicating a single primary retarder with two parts having different speeds, the invention segments the braking function into two separate retarders. The primary retarder (engine brake) provides fast response, while the secondary retarder (hydrodynamic or electromagnetic) provides additional braking capability. This segmentation achieves the desired response time without increasing the complexity of individual retarder components.
3Extent of automation
If conventional continuous braking systems are used, then braking can be switched on and off, but braking power cannot be regulated to adapt to current requirements
Solution Approach 1:
The control device dynamically regulates the braking power of both primary and secondary retarders based on current operating conditions. The system continuously monitors the braking demand and automatically adjusts the torque distribution between the two retarders, enabling adaptive braking power regulation that matches current requirements without manual intervention.
Data Source
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AI summary
FIELD: transport machine building.SUBSTANCE: disclosed is a method of operating a long-term vehicle braking system. Proposed system comprises controlled primary decelerating brake 2 and controlled secondary decelerator 5. After prolonged braking mode activation and before request for deceleration brakes deceleration after activation of long-term braking mode for the first time exceeds first threshold value (P_max), said request (10) for braking with decelerating brakes is performed by primary brake-decelerator (2). First threshold value (P_max) is set such that it corresponds to value, which is less than or equal to braking torque maximally developed by primary brake-decelerator (2). At the first excess of the first threshold value, the secondary braking decelerator is activated by the braking brakes deceleration request after the prolonged braking mode activation. Device (1) for controlling or regulating system (100) of long-term braking and a utility vehicle are also disclosed.EFFECT: higher speed of reaction of long-term braking system and/or minimization of heat influx from long-term braking and noise generation system; creation of device for improved braking request decoupling by braking decks into first part required from primary retarder brake, and to second part required from secondary brake-retarder.11 cl, 3 dwg