Shaped Hysteresis Control for Faster, More Accurate Machine Inputs
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Solution Overview
Problem
Conventional control systems for machines experience sluggish performance and undesirable steady-state errors due to noise filtering and hysteresis techniques, particularly at zero or maximum input ranges, which affect the accuracy and responsiveness of machine operations.
Innovation Solution
A control system that includes input sensors, a controller, and actuating members, where the controller determines an imposed hysteresis level using a hysteresis input function to generate a hysteresis conditioned input signal, thereby improving signal processing and reducing noise-related errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional filters are used to mitigate noise in sensor signals, then noise is reduced, but the system performance becomes sluggish
Solution Approach 1:
The patent changes the parameter of hysteresis width dynamically based on operating conditions (vehicle speed, steering angle). By adjusting this parameter, the system achieves both noise filtering and fast response - using larger hysteresis widths when noise is problematic and smaller widths when responsiveness is critical, thus resolving the contradiction between noise reduction and response speed
2Object-affected harmful factors
If hysteresis techniques are used to condition sensor signals, then noise is reduced, but steady state error increases
Solution Approach 1:
The patent makes the hysteresis width dynamic rather than fixed. The controller adjusts the hysteresis width based on real-time operating conditions - using larger widths to filter noise during normal operation and reducing or eliminating hysteresis when high precision is needed (such as at zero steering input or maximum input ranges), thus resolving the contradiction between noise filtering and steady-state accuracy
3Reliability
If large hysteresis width is used during high speed running, then influence of external disturbance is avoided, but steady state error becomes more significant
Solution Approach 1:
The patent dynamically adjusts hysteresis width based on vehicle speed and steering conditions. During high-speed running with large steering angles, larger hysteresis widths are used to reject external disturbances. However, when the steering input approaches zero or maximum ranges where precision is critical, the hysteresis width is reduced or eliminated, thus resolving the contradiction between disturbance rejection and steady-state accuracy
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 proposed solution enhances the control system's responsiveness and accuracy by dynamically adjusting the hysteresis level, minimizing steady-state errors and noise interference, especially at zero or maximum input conditions, leading to improved machine operation and operator experience.
Implementation Method 1
The controller is configured to determine an imposed hysteresis level corresponding to the input signal based on a hysteresis input function. The controller is further configured to generate a hysteresis conditioned input signal based on the imposed hysteresis level.
Data Source
AI summary
A control system for a machine having at least one control element is disclosed. The control system includes multiple input sensors in communication with the control element. The input sensor generates an input signal based on an input to the control element. The control system includes multiple actuating members to control operations of the machine. The control system includes a controller in communication with the input sensors and the actuating members. The controller receives the input signal from the input sensor and determines an imposed hysteresis level corresponding to the input signal based on a hysteresis input function. The controller is further configured to generate a hysteresis conditioned input signal based on the imposed hysteresis level.