Agricultural Spreader Brake Force Control via Chassis Strain
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Solution Overview
Problem
Existing agricultural spreading machines lack an effective braking force control system that accounts for the machine's weight, leading to inadequate braking performance on roads, increased risk of accidents, and uneven tire wear due to reliance on material fill level and environmental conditions.
Innovation Solution
A braking force control system that determines the current weight of the machine using sensors for working pressure and wheel speeds, optimizing braking force to ensure maximum braking effect without wheel locking, and continuously adjusts based on weight and brake slip data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking force is increased to ensure sufficient braking performance, then braking effectiveness is improved, but the risk of wheel locking and loss of control increases
Solution Approach 1:
The braking force control system dynamically adjusts the braking force level based on real-time detection of chassis load and material fill level. The system transitions between different braking force levels (first level for field work, second level for road transport) to optimize braking performance while preventing wheel locking under varying weight conditions
Solution Approach 2:
The system uses detection means including strain gauges on chassis struts to continuously monitor chassis load and provides feedback to the control unit. This feedback loop enables automatic adjustment of braking force to match actual vehicle weight, ensuring optimal braking without wheel locking
2Stability of the object's composition
If braking force is decreased to prevent wheel locking, then control stability is improved, but braking distance increases and braking effectiveness is reduced
Solution Approach 1:
The system dynamically adapts braking force levels to match actual vehicle weight conditions. During road transport when chassis load exceeds predetermined values, the system automatically switches to a higher braking force level to ensure sufficient braking effectiveness while maintaining control stability through controlled, non-locking brake application
3Ease of operation
If pressure sensors are used to detect chassis load, then weight measurement is simplified, but measurement accuracy deteriorates due to environmental conditions and tire heating
Solution Approach 1:
The system uses strain gauges attached to chassis struts as intermediary elements to indirectly measure chassis load. These strain gauges detect deformation of the chassis structure under load, providing a measurement that is less sensitive to environmental conditions and tire temperature variations compared to direct pressure sensors
Solution Approach 2:
The system replaces electrical pressure sensors with mechanical strain gauge measurements on the chassis structure. This substitution provides more reliable weight detection by measuring actual structural deformation rather than relying on tire pressure which varies with temperature and operating conditions
4Device complexity
If material fill level is used to determine braking force, then device complexity is reduced, but braking force accuracy deteriorates due to uneven material distribution and sloshing
Solution Approach 1:
The system uses the chassis structure itself as an intermediary measurement element. Strain gauges attached to chassis struts directly measure the load borne by the chassis, providing accurate weight detection that is independent of material distribution within the reservoir. The chassis acts as a natural load-bearing structure that reflects total vehicle weight regardless of how material is distributed or sloshing occurs
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
This solution provides optimized braking performance, reducing the risk of accidents and tire wear by adapting braking force to the machine's current weight and road conditions, ensuring a safe and efficient stop.
Implementation Method 1
The detection means can be designed, for example, in the form of a strain gauge attached to a chassis strut
Implementation Method 2
or a pressure sensor that detects a tire pressure of a wheel of the chassis
Implementation Method 3
The braking force switch automatically switches the braking force level to low when a chassis load detected by the detection device falls below a predetermined value
Data Source
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AI summary
Agricultural spreading machine (1) comprising a storage container (5) for storing material to be applied, in particular seeds, fertilizers and/or plant protection products, a frame (7) supporting the storage container (5), which is supported on the ground by means of a chassis comprising chassis wheels (3), wherein the chassis is equipped with a brake system (25) comprising a brake force control system (22), a first sensor device (16) for real-time detection of the weight force currently acting on the chassis, wherein the brake force control system (22) is suitable for adjusting the braking force of the brake system (25) on the basis of the detected weight force currently acting on the chassis, and a second sensor device (21) for real-time detection of the rotational speeds of the chassis wheels (3).In order to create an agricultural spreading machine with an automatic brake force control system (22) depending on the specific, current weight force of the spreading machine (1), it is provided that the brake force control system (22) is suitable to determine the brake slip of the chassis wheels (3) by means of the rotational speeds of the chassis wheels (3) detected by a second sensor device (21) and to regulate the current braking force by combining the data detected by a first sensor device (16) and the second sensor device (21) and the data determined by the brake force control system (22) in such a way that an optimized and/or optimal braking effect is achieved at any time according to the current weight force.