Acceleration-Based Slip Control for Heavy Machinery
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Solution Overview
Problem
Existing systems for controlling slip in heavy machinery, such as track-type tractors, are complex and unreliable, often requiring expensive sensing equipment that is vulnerable to damage and malfunctions, leading to inefficiencies and increased wear on components.
Innovation Solution
A system that includes sensors to detect acceleration and a controller to reduce power or torque transmitted to driven traction devices when slip is detected, using a power source, transmission, and brake mechanisms to minimize slip by measuring vertical acceleration and adjusting power output accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional speed measurement and calculation methods are used to detect slip, then slip control can be achieved, but the system becomes complex and time-consuming
Solution Approach 1:
The patent extracts the slip detection function from complex speed measurement and calculation systems, isolating it into a simple acceleration sensing mechanism. By using an accelerometer to directly measure slip-induced acceleration, the system removes the need for complex speed sensors, encoders, and computational algorithms, achieving reliable slip control through a single simplified measurement parameter.
Solution Approach 2:
The patent replaces mechanical speed measurement systems (encoders, tachometers, and complex mechanical sensors) with an inertial sensing approach using acceleration. This substitution eliminates mechanical contact points and complex mechanical linkages, reducing system complexity while maintaining slip detection accuracy through direct measurement of the slip phenomenon's dynamic effect.
2Measurement precision
If expensive sensing equipment is used to detect slip, then measurement precision may be improved, but the equipment becomes vulnerable to damage and malfunction
Solution Approach 1:
The patent employs a robust, relatively simple accelerometer that can be easily replaced if needed, rather than expensive, fragile precision speed sensors. The accelerometer is positioned to measure slip-induced acceleration directly, providing sufficient measurement precision for slip detection while being more durable and less vulnerable to damage from environmental factors and mechanical stress.
Solution Approach 2:
The patent uses acceleration as an intermediary parameter to detect slip, rather than directly measuring speed or position. The accelerometer measures the dynamic effect of slip (acceleration changes) which serves as a reliable indicator of slip occurrence. This intermediary measurement approach provides adequate precision for control purposes while using simpler, more reliable sensing equipment.
3Reliability
If torque is reduced to minimize slip, then wear and efficiency improve, but the response time may be delayed due to complex calculations
Solution Approach 1:
The system continuously monitors acceleration to detect slip conditions in real-time, maintaining a ready state for immediate torque reduction. By using direct acceleration measurement rather than calculating slip from speed data, the system eliminates computational delays and can trigger torque reduction almost instantaneously upon detecting slip-induced acceleration, improving response time while protecting components.
Solution Approach 2:
The replacement of complex speed measurement and calculation systems with direct acceleration sensing enables immediate detection and response to slip conditions. The accelerometer provides real-time slip indication without computational processing delays, allowing the control system to reduce torque rapidly and minimize the duration of slip events, thereby reducing wear and improving component durability.
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 approach effectively reduces tractive slip, minimizing wear on components and vibrations, thereby extending the life of machinery and reducing fuel and workforce inefficiencies, while avoiding the need for complex and unreliable sensing methods.
Implementation Method 1
at least one sensor configured to detect an acceleration of the machine
Data Source
AI summary
A system for controlling slip of a machine is disclosed. The system has a power source configured to produce a power output, at least one driven traction device, and a transmission operably connected to transmit the power output from the power source to the at least one driven traction device. The system further has at least one sensor configured to detect an acceleration of the machine and to generate a corresponding signal, and a controller configured to receive the signal and to reduce a magnitude of power or torque transmitted to the at least one driven traction device when the detected acceleration indicates slip of the at least one driven traction device.