Vehicle Shift Control System Reducing Shock During Propulsion
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Solution Overview
Problem
Existing shift control systems for vehicles with automatic transmissions face challenges in rapidly establishing desired gear stages while minimizing shock during propulsion, as they often require engaging and disengaging multiple engagement devices simultaneously, leading to inefficient shifting responses and increased shift shock.
Innovation Solution
A shift control system that uses a controller to compute and engage a target gear stage directly by disengaging all engagement devices, optionally utilizing an interim stage with a closer speed ratio, and maintaining torque capacity through specific clutch engagement strategies, allowing for smoother transitions and reduced shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple engagement devices are engaged and disengaged simultaneously to establish a gear stage, then the gear stage can be established, but shift shock increases and shifting response becomes inefficient
Solution Approach 1:
The patent segments the gear shifting process into distinct phases: a first phase where engagement devices are disengaged in sequence, and a second phase where engagement devices are engaged in sequence. This segmentation allows each device to be manipulated independently, preventing simultaneous engagement/disengagement that causes shock, while maintaining efficient overall shifting response.
Solution Approach 2:
The patent applies preliminary action by disengaging all engagement devices before engaging them in the target configuration. This preliminary disengagement phase prepares the system for the subsequent engagement phase, ensuring that no shock is generated during the transition and allowing for optimized engagement sequencing.
2Adaptability or versatility
If all engagement devices are disengaged during propulsion, then shifting flexibility is improved, but the time to establish the target gear stage increases
Solution Approach 1:
The patent applies dynamics by implementing dynamic control of engagement devices based on real-time operating conditions. The controller determines optimal engagement/disengagement timing and sequencing based on vehicle speed, accelerator position, and other parameters, allowing the system to adapt flexibly while minimizing the time to reach the target gear stage.
Solution Approach 2:
The patent changes operational parameters by transitioning from static engagement states to dynamic, condition-based engagement control. The system monitors multiple parameters (vehicle speed, accelerator position, engine load) and adjusts engagement device timing accordingly, optimizing both flexibility and response time.
3Object-affected harmful factors
If engagement devices are engaged in sequence rather than simultaneously, then shift shock is reduced, but the complexity of control increases
Solution Approach 1:
The patent implements feedback control where the controller continuously monitors the state of engagement devices and adjusts the sequencing of engagement/disengagement operations. This feedback mechanism manages the control complexity by providing real-time status information and automatically determining the optimal sequence, reducing the burden on the control system while maintaining smooth shifting.
Data Source
AI summary
A shift control device for establishing a desired gear stage promptly while reducing a shock, during propulsion while disengaging all of engagement devices of a transmission. The shift control system compares a target stage set based on an operating data to an interim stage set based on the operating data immediately before the target stage is set. If the target stage is lower than the initial stage the engagement devices are engaged to establish the target stage without establishing the initial stage.