Brake Pressure Control Valve Segmentation for Small Volume Adjustment
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Solution Overview
Problem
Existing brake pressure control systems in motor vehicles, particularly in commercial vehicles and trailer combinations, face challenges in achieving satisfactory control quality due to large pressure steps during external braking demands, especially in small volumes, leading to unsatisfactory regulation and frequent changes between pressure rise and reduction.
Innovation Solution
The method involves determining the control times of the outlet valve based on the control of the inlet valve to achieve precise and small pressure changes, allowing for high control quality in small volumes by using a pressure control valve with an inlet and outlet valve, where the control times of the outlet valve are adjusted to match the control times of the inlet valve, and a correction factor is applied to account for vehicle deceleration and past valve actuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure control valves with inlet and outlet valves are used for brake pressure adjustment, then brake pressure can be regulated during anti-lock braking, but large pressure steps occur during external braking demands resulting in unsatisfactory control quality
Solution Approach 1:
The pressure control valve is divided into two independent 2/2-way valves (inlet valve and outlet valve) that can be controlled separately. This segmentation allows independent optimization of pressure build-up and pressure reduction control, enabling small pressure steps during external braking demands while maintaining effective anti-lock braking intervention.
2Stability of the object's composition
If the outlet valve is operated during the pressure build-up phase or the inlet valve during the pressure reduction phase to enable counter control measures, then tendencies to overshoot are reduced, but the device complexity increases
Solution Approach 1:
Both the inlet valve and outlet valve are designed as independently controllable 2/2-way valves that can perform multiple functions. Each valve can operate during both pressure build-up and pressure reduction phases, providing universal functionality that simplifies the overall control system while enabling sophisticated pressure control strategies including counter control measures.
3Adaptability or versatility
If frequent changes between pressure rise and pressure reduction are made during external braking demands, then control adjustments can be made, but control quality becomes unsatisfactory due to large pressure steps
Solution Approach 1:
The control system dynamically adjusts the opening degree and timing of the inlet and outlet valves based on real-time brake pressure requirements. During external braking demands, the system can make frequent, small adjustments to valve positions rather than full open/close transitions, enabling adaptive pressure control with small steps that maintains both flexibility and control quality.
Data Source
AI summary
A method for adjusting brake pressures of a motor vehicle. The method includes actuating, by a control unit, while taking into account determined dynamic state variables of wheels that are to be braked, a pressure control valve with an inlet valve for ventilating and with an outlet valve for venting a brake pressure line that is controlled by the pressure control valve. The control times of the outlet valve are determined depending on control of the inlet valve. In an external braking mode provided for a case where an external braking demand is received that is independent of a driver's braking demand, the control unit adjusts the brake pressure in the brake pressure line according to the external braking demand by determining control times of the outlet valve depending on control of the inlet valve.