Vehicle ECU Oil Pressure Sequencing for Shift and Lockup Control
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Solution Overview
Problem
In vehicle power transmission systems, simultaneous shift control and lockup control can lead to insufficient oil pressure, compromising controllability due to overlapping initial oil pressure control requirements.
Innovation Solution
The electronic control unit manages oil pressure control by sequencing shift initial oil pressure control and lockup initial oil pressure control, ensuring they do not overlap, and prioritizes one over the other based on fuel-efficient or driveability modes to maintain adequate oil pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If shift initial oil pressure control and lockup initial oil pressure control are performed simultaneously, then fuel economy is improved, but oil pressure becomes insufficient
Solution Approach 1:
The system performs preliminary determination of whether shift control and lockup control overlap before executing initial oil pressure control. When overlap is detected, the system preemptively sequences the control operations to prevent oil pressure insufficiency, thereby maintaining reliability while still achieving fuel economy benefits through coordinated control.
Solution Approach 2:
The system dynamically adjusts the execution timing of shift initial oil pressure control and lockup initial oil pressure control based on real-time detection of control overlap. By making the control sequence adaptive rather than fixed, the system can optimize fuel economy when controls don't overlap while ensuring oil pressure sufficiency when they do overlap.
2Reliability
If lockup control is prohibited during shift control, then shift control reliability is improved, but fuel economy deteriorates
Solution Approach 1:
The system performs preliminary determination of control overlap between shift control and lockup control. Based on this preliminary assessment, it selectively permits or prohibits lockup control during shift control, thereby maintaining shift control reliability while capturing fuel economy benefits when simultaneous control is safe to execute.
Solution Approach 2:
The system changes the operational parameters of lockup control (permitting or prohibiting it during shift control) based on the detected overlap condition. This parameter adjustment allows the system to optimize the trade-off between shift control reliability and fuel economy dynamically.
3Reliability
If shift initial oil pressure control and lockup initial oil pressure control are sequenced to avoid overlap, then oil pressure sufficiency is maintained, but control responsiveness deteriorates
Solution Approach 1:
The system performs preliminary determination of whether shift control and lockup control overlap before executing initial oil pressure control. This advance planning allows the system to sequence controls optimally, maintaining oil pressure sufficiency while minimizing delays through intelligent scheduling rather than simple sequential execution.
Data Source
AI summary
An electronic control unit starts shift initial oil pressure control after the completion of lockup initial oil pressure control when shift control is performed during the performance of lockup control, the electronic control unit starts shift initial oil pressure control after the completion of lockup initial oil pressure control. Besides, the electronic control unit places priority on the shift control and starts the lockup initial oil pressure control after the completion of the shift initial oil pressure control, when the lockup control is performed during the performance of the shift control. Therefore, the shift initial oil pressure control and the lockup initial oil pressure control are prevented from occurring at the same time when the shift control and the lockup control are performed at the same time.