Emergency Brake Pressure Control Under System Malfunction
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Solution Overview
Problem
Contemporary vehicle emergency braking systems experience varying decelerations due to different friction behaviors between brake linings and disks, leading to inconsistent braking performance across velocity ranges and potential hazardous high pressures during power failures.
Innovation Solution
A control device with a pressure regulator and relay valve system that adjusts emergency brake pressure based on vehicle load, deceleration, velocity, and coefficient of friction, ensuring a safe nominal pressure level is maintained even during system malfunctions by switching between regular and safety pilot pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed emergency brake pressure at nominal pressure level is applied, then the brake pressure is simple to control, but the deceleration varies with velocity and friction coefficient leading to inconsistent braking performance
Solution Approach 1:
The patent implements dynamic emergency brake pressure control by adjusting the brake pressure in real-time based on velocity and friction coefficient feedback. The control unit modifies the nominal pressure level dynamically to compensate for varying friction conditions, ensuring consistent deceleration across different velocity ranges while maintaining manageable system complexity through automated control.
Solution Approach 2:
The system employs feedback mechanisms by monitoring velocity and friction coefficient conditions during braking operations. The control unit receives this feedback and automatically adjusts the emergency brake pressure to maintain optimal braking performance, resolving the contradiction between simple control and consistent performance through closed-loop control.
2Force
If high emergency brake pressure is applied during system malfunction, then braking force is sufficient, but hazardous high pressure levels occur after loss of electric voltage
Solution Approach 1:
The patent implements beforehand cushioning by providing a controlled pressure release mechanism that activates upon detection of power failure or system malfunction. This mechanism gradually reduces the emergency brake pressure from high levels to safe nominal levels, preventing hazardous high pressure conditions after power loss while maintaining sufficient braking force during the transition period.
Solution Approach 2:
The system employs self-service through automatic detection of power failure conditions and autonomous activation of the pressure reduction mechanism. The control unit monitors system status and independently manages the pressure transition without requiring external intervention, ensuring safe pressure levels are restored even when electric power is lost.
3Reliability
If emergency brake pressure is adjusted dynamically based on velocity and friction coefficient, then consistent deceleration is achieved, but system complexity increases
Solution Approach 1:
The patent replaces complex mechanical pressure adjustment mechanisms with an electronic control system that calculates and adjusts brake pressure based on velocity and friction coefficient data. This substitution maintains consistent deceleration through automated control algorithms while reducing mechanical complexity by using electronic sensors and control units to manage the pressure regulation process.
Data Source
AI summary
A control device and a method controlling an emergency braking pressure of a vehicle, and a vehicle having a control device of this kind, wherein a pilot control pressure (VSDI) is modulated with a pressure modulator as a function of a load condition of the vehicle, a deceleration, a speed and/or a coefficient of friction, and a safety pilot control pressure (SVSD) is controlled with an adjusting device, and wherein in normal operation, a supply pressure is controlled only by the VSDI while, in the event of a system malfunction, the supply pressure is controlled only by the SVSD, wherein it is ensured that the emergency braking pressure does not exceed a nominal pressure in the event of the system malfunction.