Hybrid AMT Shift Control Preventing Gear Blocking
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Solution Overview
Problem
Hybrid electric vehicles experience starting stage engagement failures due to a blocking phenomenon when the automatic manual transmission stops and restarts, resulting in failed gear engagement and inefficient engine re-starting.
Innovation Solution
A shift control method that adjusts the RPM of the driving motor connected to the input shaft to increase or decrease torque, ensuring proper engagement by changing the synchronizer sleeve's stroke and RPM, thereby preventing the blocking phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hybrid electric vehicle stops and re-starts with the driving motor directly connected to the input shaft, then the engine can be re-started efficiently, but the teeth of the clutch gear and synchronizer sleeve form a straight line causing a blocking phenomenon that prevents gear engagement
Solution Approach 1:
The patent applies dynamics by making the driving motor RPM adjustable rather than fixed. During the starting stage, the control unit dynamically changes the driving motor's RPM to a specific value that prevents the teeth alignment causing blocking. This dynamic adjustment ensures reliable gear engagement while maintaining the ability to restart the engine efficiently.
Solution Approach 2:
The patent changes the operational parameter of the driving motor from a fixed RPM to a variable RPM that can be adjusted to a predetermined value. By changing the RPM parameter during the starting stage, the system prevents the blocking phenomenon caused by tooth alignment while ensuring successful gear engagement and engine restart.
2Device complexity
If the driving motor RPM is kept constant during starting stage, then the control system is simple, but the gear engagement fails due to blocking phenomenon
Solution Approach 1:
The patent implements feedback control where the control unit monitors the starting stage condition and adjusts the driving motor RPM accordingly. When a starting stage failure is detected or predicted, the system feedback-adjusts the RPM to prevent blocking, ensuring reliable gear engagement while maintaining relatively simple control logic.
3Device complexity
If the teeth of clutch gear and synchronizer sleeve are aligned during starting stage, then the gear structure is simple, but the straight line alignment causes collision and engagement failure
Solution Approach 1:
The patent applies preliminary anti-action by proactively adjusting the driving motor RPM to a predetermined value before the blocking phenomenon can occur. This preventive measure counteracts the potential tooth alignment issue by ensuring the gears are not in the blocking position when engagement is attempted, thus preventing tooth collision while maintaining simple gear structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively prevents starting stage engagement failures by ensuring proper gear engagement, enhancing the idle stop and go function and improving fuel efficiency by resolving the blocking issue.
Implementation Method 1
an RPM of a driving motor which is directly connected to an input shaft is changed so that a torque applied to the input shaft of the AMT is increased or decreased
Data Source
AI summary
When a hybrid electric vehicle in which an automatic manual transmission (AMT) is equipped stops and then re-starts, when a starting stage of the AMT is not implemented, an RPM of a driving motor which is directly connected to an input shaft is changed so that a torque applied to an input shaft of the AMT is increased or decreased, and thus even though a blocking phenomenon occurs when an AMT-HEV stops and then re-starts after an engine re-starts, the torque transferred from the driving motor to the input shaft is appropriately increased and decreased and thus a gear restricted to the input shaft differently rotates from a synchronizer.