Hydropneumatic Crane Braking With Load-Dependent Pressure Control
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Solution Overview
Problem
Conventional vehicle cranes with mechanical suspension systems face challenges in adapting brake pressure to changing weights, leading to potential over-braking and loss of control when assemblies are removed or when the vehicle is loaded/unloaded, failing to meet regulatory deceleration requirements.
Innovation Solution
A vehicle crane equipped with a hydro-pneumatic suspension system and an automatically load-dependent brake force regulator that adjusts brake pressures in real-time based on the vehicle's weight status, ensuring appropriate brake force distribution across axles without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mechanical suspension systems are used with fixed brake pressure, then the braking system is simple to design and operate, but the vehicle cannot adapt to changing weights leading to over-braking and loss of control
Solution Approach 1:
The patent implements a feedback mechanism where the hydro-pneumatic suspension system continuously monitors the vehicle's weight status and automatically adjusts brake pressure accordingly. The suspension's position sensors detect load changes and send signals to the braking system control unit, which then modulates brake pressure to match current weight conditions, preventing over-braking while adapting to dynamic loading scenarios.
Solution Approach 2:
The hydro-pneumatic suspension system serves multiple functions: it provides suspension functionality while simultaneously acting as a weight sensing mechanism that triggers brake pressure adjustment. This multi-functional approach eliminates the need for separate weight sensors and control systems, reducing overall system complexity while achieving adaptive braking.
2Reliability
If brake pressure is increased to meet regulatory deceleration requirements for heavy loads, then deceleration performance improves, but over-braking occurs when assemblies are removed or vehicle is lightly loaded
Solution Approach 1:
The braking system transitions from static fixed pressure to dynamic pressure adjustment based on real-time weight conditions. The control system continuously modulates brake pressure according to suspension position feedback, ensuring optimal braking force whether the vehicle is fully loaded, partially loaded, or carrying removable assemblies, thereby maintaining reliability across all operating conditions.
Solution Approach 2:
The system changes the brake pressure parameter dynamically based on detected weight status. When the suspension detects reduced vehicle weight (such as when assemblies are removed), it automatically reduces brake pressure to prevent over-braking. Conversely, when heavy loads are detected, the system increases pressure to meet deceleration requirements, maintaining ease of operation across varying load conditions.
3Adaptability or versatility
If the vehicle crane is designed to carry removable assemblies to meet diverse operational requirements, then versatility improves, but the braking system must be repeatedly adjusted to meet regulatory requirements
Solution Approach 1:
The braking system performs self-adjustment through automatic detection of weight changes via the hydro-pneumatic suspension. When assemblies are removed or added, the suspension system automatically detects the weight change and adjusts brake pressure without requiring manual intervention, eliminating time loss associated with manual braking system adjustments while maintaining operational versatility.
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
The solution effectively prevents over-braking by dynamically adjusting brake pressures, ensuring safe and controlled braking performance across varying weight conditions, adhering to regulatory standards and enhancing operational safety.
Implementation Method 1
The hydraulic cylinders filled with oil are connected in a fluid-conducting manner with in each case a pressure vessel which is used as a reservoir
Implementation Method 2
The reservoir is divided into two chambers by means of a membrane, wherein the chamber facing the hydraulic cylinder is filled with oil and the remaining chamber is filled with gas. Owing to its compressibility, the gas acts as a suspension element
Implementation Method 3
a braking system having prescribed deceleration values
Data Source
AI summary
A vehicle crane having a hydropneumatic suspension and a braking system including wheel brakes and a first braking circuit assigned to the wheel brakes of at least one vehicle axle and a second braking circuit assigned to the wheel brakes of at least one other vehicle axle. In order to adapt the actuation of the braking system to the weight state, the hydropneumatic suspension is coupled to an automatically load-dependent braking force regulator that is operatively connected to one of the braking circuits or to one of their braking circuit sections such that, on the basis of a weight state signal of the vehicle crane generated from the hydropneumatic suspension, a braking pressure generated inside the braking circuit or braking circuit section coupled to the automatically load-dependent braking force regulator, can be varied with respect to a braking pressure generated simultaneously inside the other braking circuit or braking circuit section.