Actuator Control Device Dual Correction System Reliability
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Solution Overview
Problem
Conventional control devices for actuators, such as those in vehicle transmission oil supplying systems, face reliability issues due to degradation or malfunction of memory and calculation elements, leading to inaccurate correction of current values, resulting in inefficient energy consumption and shift shock during gear changes.
Innovation Solution
A dual correction system is implemented, comprising a control circuit with a first correction unit and a driving circuit with a second correction unit, which corrects detected control amounts and feeds back either correction to regulate the actuator's operating amount, enhancing reliability against memory and element failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single correction unit is used to correct the detected current value, then the device complexity is reduced, but the reliability of the feedback control system deteriorates when memory or calculation elements malfunction
Solution Approach 1:
The patent applies local quality by implementing correction units at different locations within the control device - one correction unit in the control circuit and another in the driving circuit. Each correction unit operates independently at its local position to correct the detected current value, ensuring that if one correction unit or its associated memory fails, the other can still maintain correction functionality, thus improving overall system reliability without requiring a completely redundant system.
Solution Approach 2:
The patent implements beforehand cushioning by providing multiple correction units and their associated memory elements in advance. These redundant correction capabilities are prepared beforehand so that when memory deterioration or element malfunction occurs, the system already has backup correction functionality available, preventing complete failure of the feedback control system and maintaining operational reliability.
2Measurement precision
If correction coefficients are stored in memory that deteriorates over time, then the initial correction accuracy is achieved, but the long-term reliability and accuracy of current detection deteriorates
Solution Approach 1:
The patent implements local quality by distributing correction functionality across multiple independent correction units, each with its own memory storage for correction coefficients. This spatial distribution ensures that deterioration of memory in one correction unit does not affect the correction capability of other units, maintaining measurement precision and reliability over the long term even as individual memory elements age.
Solution Approach 2:
The patent applies beforehand cushioning by pre-configuring multiple correction units with backup correction coefficients stored in their respective memories. This redundant setup is prepared in advance to cushion against the inevitable deterioration of memory elements over time, ensuring that the system can continue to provide accurate current detection even after prolonged operation and memory degradation.
3Reliability
If the corrected current value differs significantly from the actual current value due to correction errors, then the feedback control becomes unstable, but this causes energy waste and shift shock
Solution Approach 1:
The patent applies local quality by implementing independent correction units at different locations in the control system, each capable of independently correcting the detected current value. This distributed correction approach ensures that accurate correction is maintained locally at each stage, preventing significant deviations between corrected and actual current values, thereby maintaining feedback control stability and avoiding the energy waste and shift shock that would result from large correction errors.
Data Source
AI summary
A control unit (10) includes a microcontroller (100) that sets a duty ratio corresponding to a target current value of a linear solenoid (7a) and an ASIC (200) that supplies electricity to the linear solenoid (7a) based on the duty ratio. The microcontroller (100) includes a correction unit (110) that corrects a driving current value detected by a current sensor (300). The ASIC (200) includes a correction unit (206) that corrects the driving current value detected by the current sensor (300). A feedback amount selection unit (112) selects either one of the driving current value corrected by the correction unit (110) or the driving current value corrected by the correction unit (206) as a feedback amount corresponding to the target current value. A dual correction system is provided in a feedback control system.