Suspension System Load State Detection and Compensation
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Solution Overview
Problem
Loader vehicles with rigid front axles and floating rear axles face instability due to uneven loading and inclined positions, which can lead to rapid tipping or overturning when suspension is activated, as existing suspension systems lack effective load state detection and compensation mechanisms.
Innovation Solution
A suspension system with load state detection and compensation means, utilizing pressure transducers, sensors, and switch valves to assess and adjust hydraulic cylinder pressures, preventing activation during critical load states and ensuring stable operation by controlling the hydraulic cylinders to maintain non-critical load distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If suspension is activated on loader vehicles with floating rear axle, then ride comfort and working efficiency are improved, but vehicle stability deteriorates due to reduced support width causing rapid tipping or overturning
Solution Approach 1:
The system performs preliminary detection of load states (eccentric loading, inclined positions) before suspension activation. The control unit assesses whether critical conditions exist and either prevents activation or compensates by adjusting hydraulic cylinder pressures to shift the vehicle's center of gravity, thereby preemptively eliminating the stability risk before it materializes.
Solution Approach 2:
The system continuously monitors load states through sensors (pressure transducers, load cells, inclination sensors) and feeds this information back to the control unit. Based on the feedback, the control unit dynamically adjusts hydraulic cylinder pressures to maintain vehicle stability, creating a closed-loop control system that adapts to changing load conditions.
2Strength
If suspension system is activated without load state detection, then hydraulic cylinders provide resilient support, but tensile forces can pull hydraulic cylinders apart causing complete failure
Solution Approach 1:
Before activating the suspension, the system performs preliminary detection of load states to identify conditions that would generate dangerous tensile forces on hydraulic cylinders. The control unit either prevents activation under critical conditions or pre-adjusts hydraulic pressures to ensure cylinders remain under compression only, eliminating the risk of tensile failure.
Solution Approach 2:
The system prepares compensatory measures in advance by detecting potential critical load states before suspension activation. When eccentric loading or inclined positions are detected, the control unit pre-adjusts hydraulic cylinder pressures to compensate for upcoming tensile force risks, cushioning against potential cylinder failure before it occurs.
3Reliability
If load state detection and compensation means are added to suspension system, then vehicle stability and safety are improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it controls hydraulic cylinder activation, detects load states through integrated sensors, calculates compensation pressures, and executes stability maintenance. By consolidating these diverse functions into a single control unit, the system achieves high reliability without proportionally increasing complexity.
Solution Approach 2:
The system merges load detection sensors, control logic, and hydraulic pressure regulation into an integrated suspension control system. The control unit combines stabilization control and load state compensation functions, reducing the number of separate components and simplifying the overall system architecture while maintaining enhanced safety.
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 system prevents sudden activation-induced tipping and overturning by detecting and compensating for load states, enhancing ride comfort and driving safety by maintaining vehicle stability and reducing mechanical stress on components.
Implementation Method 1
The means for the detection and compensation of load states may comprise pressure transducers and means for registering the position of a pressure transducer, the pressure transducers in each case being arranged between the first and second chambers of each hydraulic cylinder.
Implementation Method 2
two hydraulic cylinders, which extend between the frame (12) and the axles (14, 16) of the vehicle, on either side of the vehicle central longitudinal axis... the hydraulic cylinders being connected to hydraulic accumulators
Implementation Method 3
The piston rod-side chamber (30, 32) of the first hydraulic cylinder (18, 20) is connected via a hydraulic line (34, 38) to a first hydraulic accumulator (36, 40). The piston-side chamber (26, 28) of the second hydraulic cylinder (20, 18) is connected via a hydraulic line (46, 48) to the second hydraulic accumulator (40, 36).
Data Source
AI summary
A suspension system for an agricultural or construction industry vehicle is described. The suspension system comprises two hydraulic cylinders which support a frame in relation to an axle of the vehicle, the hydraulic cylinders being hydraulically connected to one another in a cross connection, so that a piston-side chamber of the one hydraulic cylinder is connected to the piston rod-side chamber of the other hydraulic cylinder and vice versa, in each case one hydraulic accumulator assigned to a hydraulic cylinder, a hydraulic source, a hydraulic tank, a control valve device, an electronic control unit, electrically switchable switch valves which are arranged in the cross connection between the hydraulic accumulators and the hydraulic cylinders, and a first and second supply line, which supply lines connect the control vale device to the cross connection. In order to prevent the activation of a suspension state in critical vehicle states, means for the detection and compensation of load states of the vehicle are provided in the suspension system.