Power Transfer Unit Maintenance for Drive Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In all-wheel drive vehicles, actuation components of the power transfer unit (PTU) can become stuck or inoperable when not used for a period, leading to failure in switching between two-wheel drive and all-wheel drive modes.
Innovation Solution
A method and system for performing PTU maintenance tasks, including determining communication errors, read-memory errors, or the absence of PTU shifts between drive modes for a threshold period, and executing maintenance tasks when the vehicle is not in the RUN state, such as resetting counters and moving actuator components to prevent sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the PTU is not used for a period of time, then the vehicle can operate in two-wheel drive mode to improve fuel efficiency, but the actuation components within the PTU become stuck or inoperable
Solution Approach 1:
The system performs preliminary maintenance actions by cycling the actuation components through engagement and disengagement movements during periods when the vehicle is operating in two-wheel drive mode. This preliminary action prevents the components from becoming stuck or inoperable before the problem actually occurs, resolving the contradiction between fuel efficiency and component reliability.
2Reliability
If the PTU actuation components are moved frequently to prevent sticking, then component reliability is maintained, but unnecessary wear and energy consumption increase
Solution Approach 1:
The system implements periodic maintenance cycles where the actuation components are moved through engagement and disengagement positions at predetermined intervals during two-wheel drive operation. This periodic action maintains component reliability while minimizing unnecessary movements, thereby reducing wear and energy consumption compared to continuous cycling.
3Ease of manufacture
If the PTU maintenance task is executed during RUN state, then maintenance can be performed, but vehicle operation is interrupted and driver attention is required
Solution Approach 1:
The system executes PTU maintenance tasks during non-RUN states (such as when the vehicle is parked or the engine is off), allowing maintenance to be performed without interrupting vehicle operation or requiring driver attention during active driving. This maintains the continuity of useful action by separating maintenance operations from operational periods.
Data Source
AI summary
A system is described, as well as methods of using the system. The method may include: determining at least one of the following: a communication error, a read-memory error, or an absence of a PTU shift between a two-wheel drive (2WD) mode and an all-wheel drive (AWD) mode for a threshold amount of vehicle operation; determining that a vehicle ignition state is not in a RUN state; and executing the task.