Powertrain Torque Transfer During Driveline Errors
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Solution Overview
Problem
In all-wheel drive vehicles, powertrain systems experience torque reduction when an error occurs, potentially leading to reduced performance and mechanical component damage, as existing systems typically reduce torque transfer during errors to prevent damage.
Innovation Solution
A powertrain system with a computer-controlled method to determine the state of a power take-off unit (PTU) and transfer normal torque to a secondary drive unit (SDU) during errors, using electronic traction control and actuator control to maintain torque delivery, even when errors are detected at the PTU or SDU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If torque reduction is applied during driveline errors, then mechanical component damage is prevented, but vehicle performance and power delivery are reduced
Solution Approach 1:
The system dynamically changes the torque parameter based on error type. For non-critical errors (position errors, power draw errors), the system maintains normal torque levels by overriding reduction commands. For critical errors, torque reduction is applied. This selective parameter adjustment resolves the contradiction by adapting torque delivery to the specific error condition rather than applying uniform reduction.
Solution Approach 2:
The error handling system segments errors into different categories (position errors, power draw errors, other errors) and applies different torque management strategies to each segment. This segmentation allows the system to maintain normal torque for recoverable errors while reducing torque only for critical failures, thus preserving power delivery where safe while protecting components where necessary.
2Power
If normal torque is maintained during errors, then vehicle performance is preserved, but mechanical component damage risk increases
Solution Approach 1:
The system continuously monitors driveline parameters (position, power draw, error codes) and uses this feedback to dynamically adjust torque delivery. When errors are detected, the system evaluates the error type through feedback loops and adjusts torque accordingly - maintaining normal torque for non-critical errors while reducing torque for critical errors. This feedback mechanism allows the system to preserve power delivery while protecting components based on real-time conditions.
Solution Approach 2:
The torque management system transitions from a static torque reduction approach to a dynamic approach that adapts to specific error conditions. The system can switch between normal torque and reduced torque states based on the detected error type, making the torque delivery flexible and condition-dependent rather than fixed, thus resolving the contradiction between performance preservation and damage prevention.
3Strength
If torque reduction is implemented during errors, then component protection is achieved, but user experience and traction control effectiveness deteriorate
Solution Approach 1:
The system changes the torque parameter selectively based on error classification. For position errors and power draw errors, the system overrides torque reduction and maintains normal torque levels, thereby preserving traction control effectiveness and user experience. For other critical errors, torque reduction remains active to protect components. This selective parameter adjustment resolves the contradiction by maintaining performance where errors are recoverable.
Data Source
AI summary
A system is described, as well as methods of using the system. The method includes: determining an error within the vehicle driveline system; following the error, determining that a state of a power take-off unit (PTU) within the system is determinable; and then transferring a normal torque from the PTU to a secondary drive unit (SDU) during the error.