Automatic Transmission Controller Solenoid Feedback Cycle Segmentation
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Solution Overview
Problem
Automatic transmission controllers face increased processing loads due to the rising number of solenoids required for advanced gear shifts, leading to potential impracticality and high costs for high-performance controllers capable of handling these loads efficiently.
Innovation Solution
Implementing a current controller that performs feedback control on solenoids with distinct current feedback cycles, setting short cycles for target solenoids and long cycles for non-target solenoids during gear shifts to reduce processing load and enhance responsiveness while maintaining hydraulic control precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of solenoids is increased to support more gear positions, then the gear shifting capability is improved, but the processing load on the controller increases
Solution Approach 1:
The patent segments the feedback control process by identifying target solenoids involved in gear shift operations and applying a short feedback cycle only to them, while using a long feedback cycle for non-target solenoids. This segmentation allows the system to handle multiple solenoids efficiently without proportionally increasing the overall processing load.
Solution Approach 2:
The patent applies different feedback cycle qualities to different solenoids based on their role in the current operation. Target solenoids receive high-priority short-cycle control for precise timing, while non-target solenoids receive standard long-cycle control. This local differentiation optimizes the balance between responsiveness and processing load.
2Speed
If a short feedback cycle is applied to all solenoids to improve responsiveness, then the gear shift responsiveness is improved, but the processing load becomes excessively high
Solution Approach 1:
The patent divides solenoids into target and non-target groups, applying short feedback cycles only to target solenoids during gear shift operations. This selective segmentation maintains high responsiveness for critical components while avoiding the excessive processing load that would result from applying short cycles to all solenoids.
Solution Approach 2:
The patent implements partial high-performance control by applying short feedback cycles only to the extent necessary for achieving responsive gear shifts (i.e., only to target solenoids). This partial action provides sufficient responsiveness without the excessive processing burden of universal short-cycle control.
3Device complexity
If a long feedback cycle is used for all solenoids to reduce processing load, then the processing load is reduced, but the gear shift responsiveness deteriorates
Solution Approach 1:
The patent segments the solenoid population into target and non-target groups, applying long feedback cycles to non-target solenoids to reduce processing load while maintaining short feedback cycles for target solenoids to preserve gear shift responsiveness. This segmentation resolves the contradiction by distributing different cycle lengths appropriately.
Solution Approach 2:
The patent applies different feedback cycle qualities to different solenoids based on their operational importance. Non-target solenoids receive long-cycle control for load reduction, while target solenoids receive short-cycle control for responsiveness. This local quality differentiation maintains overall system performance while reducing total processing load.
Data Source
AI summary
An automatic transmission controller includes a solenoid drive controller that performs a current feedback control to one or more of a plurality of solenoids that correspond to a plurality of gear positions for shifting to one of the plurality of gear positions in a transmission mechanism. From among all the solenoids, the solenoid drive controller distinguishes one or more target solenoids to operate to shift from a current gear position to a post-change gear position, and changes a current feedback cycle of the target solenoid(s) for performing the current feedback control.