Hybrid Driveline Mode Change Delay Controller
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid vehicles experience frequent driveline mode changes during cruise or speed control modes, leading to driveline mode change busyness, which reduces durability, disturbs passengers, and affects fuel economy.
Innovation Solution
Implementing a method that delays driveline mode changes based on the time since a change in desired vehicle speed, reducing the frequency of mode switches by using a predetermined time delay to adjust propulsion sources and transmission operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driveline mode changes are implemented frequently to optimize vehicle speed control, then vehicle speed control precision is improved, but driveline durability and passenger comfort deteriorate due to mode change busyness
Solution Approach 1:
The controller monitors the time since the last driveline mode change and prevents mode changes until a predetermined time interval has elapsed. This preliminary timing check avoids frequent mode changes and their harmful effects on driveline durability while maintaining adequate speed control through continuous torque adjustment of the engine and DISG.
2Adaptability or versatility
If driveline mode changes are implemented frequently to respond to speed adjustments, then vehicle speed adaptability is improved, but fuel economy deteriorates due to mode change busyness
Solution Approach 1:
The controller checks the time elapsed since the last driveline mode change before permitting a new mode change. This timing constraint reduces unnecessary mode changes that would increase energy consumption, while the system maintains adaptability to speed changes through continuous torque management of the engine and DISG within the existing driveline mode.
3Speed
If driveline mode changes are implemented frequently to maintain desired vehicle speed, then vehicle speed control responsiveness is improved, but system complexity increases due to frequent clutch engagement and disengagement
Solution Approach 1:
The controller implements a time-based gate that prevents driveline mode changes until a predetermined interval has passed since the last change. This simplifies control logic by adding a single time-check condition, while maintaining responsiveness through continuous torque adjustment of the engine and DISG without requiring frequent clutch operations.
Data Source
AI summary
Systems and methods for reducing driveline mode change busyness for a hybrid vehicle are presented. The systems and methods may delay a driveline mode change in response to a time since a change from a first desired vehicle speed to a second vehicle speed, or alternatively, driveline mode changes may be initiated in response to an estimated time to change from the first desired vehicle speed to the second desired vehicle speed.