Temperature-Adaptive Abutment Detection in Actuator Control
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Solution Overview
Problem
Existing control devices fail to accurately detect abutment due to changes in ambient temperature affecting motor torque and hydraulic load pressure, leading to erroneous detection of overcurrent or load pressure.
Innovation Solution
A control device that includes a thrust detector, temperature acquirer, threshold calculator, and abutment detector to adjust thresholds and thrust limits based on temperature, ensuring accurate abutment detection by considering environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold is used for overcurrent detection, then the detection method is simple, but erroneous detection occurs due to temperature-induced changes in motor torque and friction coefficient
Solution Approach 1:
The patent applies dynamics by making the detection threshold variable rather than fixed. The threshold is dynamically adjusted based on detected temperature, allowing the system to adapt to changing friction coefficients and motor characteristics. This resolves the contradiction by enabling accurate abutment detection across temperature variations without requiring an overly complex fixed-threshold system.
Solution Approach 2:
The patent changes the parameter of the detection threshold based on temperature. By detecting temperature and selecting different threshold values from a map or calculating them through formulas, the system adapts to temperature-induced changes in motor torque and friction. This parameter change approach enables accurate abutment detection while maintaining relatively simple system architecture.
2Reliability
If the overcurrent threshold is set high to avoid false detection at low temperature, then false detection is reduced, but abutment detection becomes unreliable at high temperature
Solution Approach 1:
The patent makes the detection threshold dynamic by adjusting it according to temperature. At low temperatures where friction is high, the threshold is set higher to avoid false detection. At high temperatures where friction is low, the threshold is reduced to ensure reliable abutment detection. This dynamic adjustment resolves the contradiction between reliability and precision across different operating conditions.
Solution Approach 2:
The patent changes the threshold parameter based on temperature conditions. By storing multiple threshold values in a map or using temperature-dependent formulas, the system selects appropriate thresholds for different temperature ranges. This ensures both reliability (avoiding false detection at low temperature) and precision (detecting abutment accurately at high temperature).
3Measurement precision
If a fixed load pressure threshold is used for abutment detection in hydraulic systems, then the detection system is simple, but erroneous detection occurs due to temperature-induced changes in working fluid viscosity and load pressure
Solution Approach 1:
The patent applies dynamics by making the load pressure threshold variable based on temperature. As temperature changes affect working fluid viscosity and consequently load pressure, the threshold is dynamically adjusted to compensate. This enables accurate abutment detection despite temperature-induced pressure variations without requiring complex compensation mechanisms.
Solution Approach 2:
The patent changes the load pressure threshold parameter according to temperature. By detecting temperature and selecting or calculating appropriate threshold values, the system compensates for temperature-induced changes in working fluid viscosity and load pressure. This parameter adaptation enables accurate abutment detection while maintaining relatively simple system architecture.
4Reliability
If the load pressure threshold is set high to avoid false detection at low temperature, then false detection is reduced, but abutment detection becomes unreliable at high temperature
Solution Approach 1:
The patent makes the load pressure threshold dynamic by adjusting it according to temperature. At low temperatures where viscosity is high and load pressure is elevated, the threshold is set higher to avoid false detection. At high temperatures where viscosity is low and load pressure decreases, the threshold is reduced to ensure reliable abutment detection. This dynamic adjustment resolves the contradiction between reliability and precision.
Solution Approach 2:
The patent changes the load pressure threshold parameter based on temperature conditions. By storing multiple threshold values or using temperature-dependent calculations, the system selects appropriate thresholds for different temperature ranges. This ensures both reliability (avoiding false detection at low temperature) and precision (detecting abutment accurately at high temperature).
Data Source
AI summary
This machine control device comprises an actuator that produces a thrust force, detects the thrust force of the actuator, acquires the temperature, calculates a threshold value that decreases monotonically with respect to the temperature, compares the thrust force of the actuator with the threshold value, and detects abutment when the thrust force exceeds the threshold value. This machine control device comprises an actuator that produces a thrust force, acquires the temperature, calculates a thrust force limit value that decreases monotonically with respect to the temperature, limits the thrust force of the actuator with the thrust force limit value as an upper limit, detects the speed of a part driven by the thrust force of the actuator, and detects abutment when the part has stopped.