Hydraulic Roll Stabilization System for Two-Track Vehicles
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Solution Overview
Problem
Existing hydraulic roll stabilization systems for vehicles are energetically inefficient and require continuous operation of the hydraulic pump to vary the spring rate of the anti-roll bar, leading to unnecessary energy consumption and potential safety risks.
Innovation Solution
An electric motor-driven pump with switching valves in each hydraulic line leading to the working chambers of the swivel motor, controlled by an electronic control unit to set and lock hydraulic pressure, allowing for variable spring rate adjustment without continuous pump operation, and incorporating safety and pressure relief valves for fault tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hydraulic pump operates continuously to maintain variable spring rate, then the spring rate can be adjusted dynamically, but energy consumption increases significantly
Solution Approach 1:
The system pre-pressurizes the hydraulic accumulator during low-demand periods (such as nighttime parking) so that when roll stabilization is needed, the pre-stored hydraulic energy can be immediately deployed without requiring continuous pump operation. This preliminary energy storage resolves the contradiction by separating the energy accumulation phase from the energy consumption phase.
Solution Approach 2:
Instead of continuous pump operation, the system uses periodic or on-demand pump activation triggered by actual roll stabilization needs. The electronic control unit monitors vehicle conditions and activates the pump only when roll correction is required, rather than maintaining continuous hydraulic pressure through constant pump operation.
2Use of energy by moving object
If the hydraulic pump is switched off to save energy, then energy consumption decreases, but the spring rate cannot be varied dynamically
Solution Approach 1:
A hydraulic accumulator acts as an intermediary energy storage device between the pump and the anti-roll bar system. The accumulator stores hydraulic energy in the form of pre-compressed gas or spring pressure, which can be released on-demand to adjust the spring rate without requiring the pump to remain continuously operational. This intermediary component decouples the pump's operational status from the system's adaptability.
Solution Approach 2:
The hydraulic accumulator provides self-service by automatically releasing stored hydraulic energy when pressure differential sensors detect the need for roll stabilization. The system uses the stored energy to vary the spring rate dynamically without requiring active pump control or external energy input at the moment of adjustment.
3Speed
If hydraulic fluid is circulated continuously under pressure for fast reaction time, then response speed improves, but energy loss increases
Solution Approach 1:
The hydraulic accumulator is pre-charged with pressurized fluid during periods when rapid response is not critical (such as nighttime), creating a reservoir of ready-to-deploy hydraulic energy. When fast reaction is needed during daytime operation, this pre-prepared hydraulic pressure is immediately available, eliminating the need for continuous high-energy fluid circulation.
4Force
If the pump operates at high power to provide sufficient hydraulic pressure, then the spring rate can be increased, but energy consumption increases
Solution Approach 1:
The hydraulic accumulator serves as a mechanical power amplifier, storing energy from relatively low-power pump operations and releasing it as high-power hydraulic pressure when needed. This allows the system to achieve high spring forces through the accumulator's pre-stored energy rather than requiring the electric motor and pump to continuously operate at high power levels.
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
Enables efficient energy use by allowing the pump to shut down while maintaining a high spring rate, improving vehicle handling and safety by varying the spring rate based on driving conditions and hydraulic pressure, and ensuring safe operation through fault protection.
Implementation Method 1
introducing a hydraulic medium supplied by a pump (3) under pressure into the working chambers (R1, R2) of the rotary actuator
Implementation Method 2
introducing a hydraulic medium supplied by a pump (3) under pressure into the working chambers (R1, R2) of the rotary actuator
Implementation Method 3
switching valves (13), which are provided in each hydraulic line (12-1, 12-2) leading to one of the two working chambers (R1, R2)
Implementation Method 4
the stabilizer bar halves (L1, L2) can be torsionally rotated relative to one another by means of a hydraulic rotary actuator
Data Source
Figure 1
AI summary
The invention relates to a hydraulic roll stabilization system of a two-track vehicle, comprising a divided roll stabilizer on at least one axle, the stabilizer halves of which can be twisted in relation to each other by means of a hydraulic oscillating motor, in that, by means of hydraulic lines having a plurality of valves that can be controlled by an electronic control unit, a hydraulic medium conveyed by a pump is introduced in a specific manner into two working chambers of the oscillating motor that act against each other. The pump is driven by electric motor and thus can be controlled in respect of the delivery rate of the pump, and, in each hydraulic line leading to one of the two working chambers of the oscillating motor, a switching valve associated with said working chamber is provided, which switching valves are opened or closed in a specific manner by the electronic control unit in accordance with the driving state of the vehicle and the value of the hydraulic pressure difference between the two working chambers.