Lifting Axle Control Device for Industrial Motor Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control systems for added axles in industrial motor vehicles are inadequate, leading to unbalanced dynamic behavior, instability, and slow response due to their design, which is not suitable for motor vehicles, particularly causing issues during maneuvers and uneven load conditions.
Innovation Solution
A control device and configuration method for added axles that utilize a modified valve unit with a stop valve and solenoid valve, along with an electric pressure switch, to independently manage and coordinate the lifting and lowering of multiple axles, ensuring symmetric behavior and rapid response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pneumatic suspension is monitored for lowering the added axle, then the control system is simple, but the vehicle exhibits unbalanced dynamic behavior and instability during maneuvers
Solution Approach 1:
The patent divides the single monitored pneumatic suspension into multiple monitored suspensions (at least two pairs of pneumatic suspensions). This segmentation allows independent monitoring of each suspension, enabling balanced and stable dynamic behavior during vehicle maneuvers while maintaining coordinated control of the added axle.
2Ease of manufacture
If the valve unit is designed according to the manufacturer's predetermined scheme, then the device is easy to manufacture, but the response time is slow and not suitable for motor vehicle dynamics
Solution Approach 1:
The patent introduces a narrowing (restriction) in the pneumatic circuit between the connector and the valve unit, along with an external compensation tank. This dynamic modification creates pressure delays that prevent premature activation while enabling rapid response when activation is required, adapting the slow manufacturer-designed valve unit to the dynamic requirements of motor vehicles.
3Device complexity
If the connector serves dual function as inlet for valve unit control and inlet for filling pneumatic suspension, then the device complexity is reduced, but pressure increases from road jolts cause false activation of the valve unit
Solution Approach 1:
The patent introduces a narrowing (restriction) as an intermediary element in the pneumatic circuit between the connector and the valve unit. This intermediary creates a pressure delay effect that filters out sudden pressure increases from road jolts, preventing false activation while allowing the connector to maintain its dual function.
Solution Approach 2:
The external compensation tank connected through the narrowing acts as a cushioning element that absorbs sudden pressure variations before they reach the valve unit. This beforehand cushioning prevents false activation due to road irregularities while maintaining system reliability.
4Device complexity
If all added axles are controlled together as a group, then the control system is simple, but the system cannot manage individual axle loads independently
Solution Approach 1:
The patent monitors at least two pairs of pneumatic suspensions independently rather than controlling all added axles together as a group. This segmentation enables individual axle load management and asymmetric control configurations while maintaining a relatively simple control system structure through coordinated valve unit operation.
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 provides stable and coordinated control of added axles, improving vehicle stability and response during dynamic maneuvers by allowing independent management of axle loads and pressure thresholds, thus enhancing the vehicle's handling and load distribution.
Implementation Method 1
The signal used to lower the added axle is the pressure in a pneumatic suspension of a main axle
Implementation Method 2
an external compressed air source (4)
Implementation Method 3
a valve unit (7) formed by at least a first valve (72), whose control is connected to a first connector (21)
Implementation Method 4
two-position valves which are brought in release position by a return spring
Data Source
AI summary
Method and device for controlling an added axle of an industrial motor vehicle comprising a first (III) and a second added axle (IV), the method comprising a step for verifying that said first added axle (III) is in lowered position before allowing a lowering of the second added axle. The method being realized by means of a modified control scheme of a known valve unit.