ABS Brake Valve Actuation Control for Deceleration Precision
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Solution Overview
Problem
Existing ABS brake systems face challenges in accurately regulating vehicle deceleration, particularly for small braking demands or ramp-shaped deceleration profiles, leading to excessive control errors and potential loss of stability, due to simultaneous actuation of all pressure control valves even when a minimum actuation time is not necessary.
Innovation Solution
A method that recalculates actuation times for pressure control valves, using a smaller subset of valves when the calculated times fall below a minimum actuation time, to ensure the target vehicle deceleration is achieved with more precise control, reducing the number of actuated pressure control valves and thereby increasing actuation times to compensate for the omitted braking effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all pressure control valves are actuated simultaneously to achieve target vehicle deceleration, then the braking response is fast, but the control precision deteriorates for small braking demands due to minimum actuation time constraints
Solution Approach 1:
The patent segments the actuation of pressure control valves by spatial position rather than acting on all valves simultaneously. When minimum actuation time would be violated, the control device selectively actuates only those valves whose actuation time would not fall below the minimum threshold, dividing the braking function across different spatial locations (axles and wheels) to maintain both responsiveness and precision.
Solution Approach 2:
The patent applies local quality by treating different pressure control valves differently based on their individual actuation time characteristics. Instead of uniform actuation, the control device evaluates each valve's actuation time against the minimum threshold and applies actuation only where appropriate, creating localized control quality that adapts to specific braking demands and valve characteristics.
2Measurement precision
If the actuation time of pressure control valves is reduced to meet small braking demands, then the control accuracy improves, but the reliability deteriorates due to violation of minimum actuation time requirements
Solution Approach 1:
The patent applies preliminary anti-action by proactively preventing the violation of minimum actuation time requirements. The control device calculates actuation times for all pressure control valves before actuation and identifies which valves would violate the minimum threshold. By preemptively excluding these valves from actuation, the system avoids unreliable operation while maintaining control accuracy through selective actuation of compliant valves.
3Device complexity
If a fixed number of pressure control valves are actuated to achieve target deceleration, then the control logic is simple, but the adaptability deteriorates when dealing with different braking scenarios and minimum actuation time constraints
Solution Approach 1:
The patent applies dynamics by making the number and selection of actuated pressure control valves variable rather than fixed. The control device dynamically determines which valves to actuate based on real-time calculations of actuation times and comparison with minimum thresholds. This dynamic adaptation allows the system to handle diverse braking scenarios (small demands, large demands, ramp-shaped profiles) while maintaining relatively simple control logic through automated threshold-based selection.
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
This approach allows for more accurate and reliable braking, reducing control errors and the risk of ABS brake slip, enhancing safety and comfort by adjusting vehicle deceleration in smaller steps and maintaining the required minimum actuation time.
Implementation Method 1
the inlet valve or the outlet valve is in an open or in a closed state, so that with suitable actuation a brake pressure on the respective wheel brakes can either be increased, maintained or reduced
Data Source
AI summary
A method for regulating a vehicle-actual-deceleration in a vehicle with an ABS brake system includes detecting the vehicle-actual-deceleration; determining a target vehicle deceleration and detecting at least one actual wheel rotational behavior. The method further includes calculating actuation times for actuation of pressure control valves of the ABS brake system associated with the wheels of the first vehicle axle and the wheels of the further vehicle axle and determining correction actuation times if at least one of the respective calculated actuation times is less than a minimum actuation time associated with the respective pressure control valve. Calculation of each of the respective actuation times is carried out at least for all of a first number of pressure control valves with which wheels are associated whose rotational behavior follows the at least one actual wheel rotational behavior.