Heavy Vehicle Arm Maneuver Recording With Variable Sampling
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Solution Overview
Problem
Existing methods for recording manoeuvres of heavy vehicles with multi-joint arms require significant memory allocation due to fixed sampling rates, leading to inefficient use of on-board storage and increased complexity, especially when recording manoeuvres with varying speeds.
Innovation Solution
A method that dynamically samples manoeuvre data based on angular position and speed interest points, using a variable sampling rate and interpolation techniques to reconstruct the manoeuvre, reducing memory requirements and allowing for efficient storage and automated repetition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed sampling rate is used to record manoeuvre data, then the manoeuvre can be recorded with consistent time intervals, but the memory allocation increases significantly and storage unit fills up quickly
Solution Approach 1:
The patent applies dynamic sampling by varying the sampling rate based on the actual manoeuvre characteristics. The control unit adjusts the sampling interval dynamically: using higher sampling rates during fast movements to capture critical data points, and lower sampling rates during slow or stationary phases. This dynamic approach maintains manoeuvre recording accuracy while significantly reducing the total data volume stored in memory compared to fixed high-rate sampling.
Solution Approach 2:
The patent changes the sampling rate parameter adaptively based on manoeuvre conditions. The control unit monitors manoeuvre speed and complexity, then adjusts the sampling frequency accordingly. During high-speed or high-complexity manoeuvres, the sampling rate increases to capture detailed trajectory information; during low-speed or simple manoeuvres, the sampling rate decreases. This parameter adaptation resolves the contradiction between recording precision and memory consumption.
2Quantity of substance
If the sampling rate is reduced to decrease memory allocation, then less memory is required, but manoeuvres comprising fast movements cannot be adequately recorded
Solution Approach 1:
The system dynamically adjusts sampling density based on real-time manoeuvre characteristics. When fast movements are detected (through speed sensors or position change analysis), the sampling rate automatically increases to capture the rapid changes accurately. During slow movements, the sampling rate decreases. This dynamic adaptation ensures that memory is efficiently used while critical fast movements are adequately recorded with sufficient detail.
Solution Approach 2:
The control unit continuously monitors manoeuvre parameters such as angular velocity, linear velocity, or position changes between samples. Based on this feedback, it adjusts the sampling rate in real-time. When the feedback indicates fast movement (exceeding a threshold), the system increases sampling frequency to maintain recording accuracy. This feedback mechanism ensures that memory allocation is optimized without sacrificing the accuracy of fast manoeuvre segments.
3Adaptability or versatility
If multiple manoeuvres are stored in the on-board storage unit, then more operational patterns can be saved, but the required memory allocation increases accordingly
Solution Approach 1:
The system stores multiple manoeuvres by applying dynamic sampling to each recorded pattern. Instead of using a uniform high sampling rate for all manoeuvres, the system processes each manoeuvre individually, adjusting the sampling rate according to its specific characteristics and duration. This allows the storage unit to accommodate more manoeuvre patterns with varying complexity while keeping total memory allocation manageable through efficient, adaptive data compression.
Data Source
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AI summary
Method (50) for recording a manoeuvre of an operable arm (12) of a heavy vehicle (10), having at least one joint (16), the method comprising the steps of: while a user executes the manoeuvre by operating the operable arm (12), acquiring (S12), by a control unit (30) of the heavy vehicle (10), a joint position signal indicative of a trajectory of said joint (16); determining (S16) a joint speed signal indicative of the speed of said joint (16); determining (S18), by the control unit (30), a plurality of first speed interest points of the joint speed signal, each couple of immediately consecutive first speed interest points being indicative of a reciprocal speed difference greater than a threshold speed difference, the first speed interest points having first time values; associating (S18) to the first speed interest points, by the control unit (30), first position interest points of the joint position signal, having the first time values; and generating (S20), by the control unit (30) and based on the first position interest points, a recorded position signal indicative of the trajectory of said joint (16) and thus of said manoeuvre.