Electrified Powertrain State Selection Stabilization
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Solution Overview
Problem
Existing multi-mode powertrain systems face challenges in stabilizing the selection between operating range states, particularly when a change of mind condition is detected during a shift from one operating range state to another, leading to potential over-stabilization and inefficient energy management.
Innovation Solution
The implementation of a strategic range selection controller that monitors powertrain information and compares it to a driver perception threshold, allowing a shift to a preferred operating range state only if the change of mind condition is satisfied and the energy differential between states achieves a defined integration threshold, thereby avoiding unnecessary shifts and stabilizing the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transmission shifts to a preferred operating range state during ongoing shift, then energy efficiency is improved, but system stability deteriorates due to over-stabilization and excessive shift business
Solution Approach 1:
The control system continuously monitors powertrain information including current operating state, requested operating state, and shift progress. When a change of mind condition is detected during shift, the system uses feedback about the shift state and powertrain information to determine whether to honor the new request or maintain the original shift, preventing excessive and destabilizing shifts while still allowing energy-efficient transitions when appropriate
Solution Approach 2:
The system dynamically adjusts its response to operating state requests based on the current shift context. Rather than rigidly following every state change request or maintaining static stability, the control system adapts its behavior based on shift progress, detection of change of mind conditions, and powertrain information, allowing flexible stabilization that balances energy efficiency with system stability
2Adaptability or versatility
If the transmission honors every requested operating range state change, then adaptability is improved, but system complexity increases due to excessive shift business
Solution Approach 1:
The control system acts as an intermediary between the operating state request and the transmission shift execution. It introduces an additional decision layer that evaluates whether to honor the request based on shift context and change of mind detection, filtering out unnecessary shift commands while preserving adaptability for legitimate state changes, thereby reducing overall system complexity
3Measurement precision
If the transmission monitors powertrain information continuously, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The system performs preliminary monitoring of powertrain information to detect change of mind conditions before executing shifts. By proactively identifying when a new operating state request conflicts with an ongoing shift, the system avoids unnecessary monitoring and processing of detailed powertrain parameters unless a change of mind is detected, reducing overall energy consumption while maintaining measurement precision when needed
Data Source
AI summary
A method for stabilizing selection between a plurality of operating range states of an electro-mechanical multi-mode transmission configured to transfer torque among an engine, at least one electric machine, and a driveline includes requesting operation of the transmission in a preferred operating range state while a shift from a first operating range state to a second operating range state is in progress prior to achieving the second operating range state. Powertrain information is monitored and compared to a driver perception threshold only if a change of mind condition is detected. The shift to the second operating range state is avoided and a shift to the preferred operating range state is commanded if the powertrain information does not violate the driver perception threshold.