Dynamic Hysteresis Band for Powertrain Control
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Solution Overview
Problem
Powertrain systems face inefficiencies due to hysteresis in control variable transitions, leading to increased power consumption and potential component wear, as they often operate within non-optimal states to minimize state transitions.
Innovation Solution
A method is introduced to determine an initial state transition threshold and associated hysteresis band for powertrain control variables, which decays over time, allowing for the selection of a preferred state based on operating parameters, thereby optimizing power consumption and reducing unnecessary transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hysteresis band is applied to minimize state transitions, then component wear and operator dissatisfaction are reduced, but power consumption increases due to operation in non-optimal states
Solution Approach 1:
The hysteresis band is made dynamic by decaying over time. The controller applies a time-varying hysteresis band that decreases as the duration of operation in the current state increases, allowing the system to transition from a conservative initial state to a more optimal state over time, thereby reducing power consumption while maintaining component reliability.
Solution Approach 2:
The controller changes the parameter of the hysteresis band width over time. By decaying the hysteresis band based on the duration of operation in the current state, the system adapts the transition thresholds dynamically, enabling operation in non-optimal states only temporarily while minimizing unnecessary transitions that would cause component wear.
2Reliability
If state transitions are minimized through hysteresis, then component wear is reduced, but system performance deteriorates due to operation in non-optimal states
Solution Approach 1:
The system dynamically adjusts the hysteresis band width based on operational duration. This allows the system to maintain stable operation and protect components during initial transitions, then progressively optimize performance by allowing transitions as the hysteresis band decays, achieving both component reliability and improved system performance over time.
Solution Approach 2:
The controller applies a preliminary larger hysteresis band at the beginning of operation to minimize transitions and protect components. As time progresses and the hysteresis band decays, the system naturally transitions to more optimal states, achieving performance optimization without sudden aggressive transitions that would harm components.
3Reliability
If a fixed hysteresis band is used to prevent excessive transitions, then component wear is minimized, but power consumption increases due to inability to adapt to changing operating conditions
Solution Approach 1:
The hysteresis band transitions from a fixed value to a dynamic, time-varying parameter. The controller decays the hysteresis band based on the duration of operation in the current state, enabling the system to adapt to changing operating conditions while maintaining component protection during critical transition periods.
Solution Approach 2:
The controller periodically evaluates the current state duration and adjusts the hysteresis band accordingly. This periodic adjustment allows the system to maintain protective hysteresis when needed while gradually reducing it to allow optimal operation, adapting rhythmically to operational patterns and reducing overall power consumption.
Data Source
AI summary
A powertrain system is described, including a method for controlling a control variable for an element thereof. The method includes determining an initial state transition threshold and an associated hysteresis band for an operating parameter related to the control variable. The hysteresis band is decayed based upon operation in a present state of the control variable for powertrain element, and a preferred control variable for the powertrain element is selected based upon a comparison of the operating parameter and the initial state transition threshold accounting for the decayed hysteresis band for the operating parameter. The element of the powertrain system is controlled to the preferred state for the control variable.