Vehicle Electric Machine Coupling Priority for Fault Torque Control
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Solution Overview
Problem
Managing multiple traction power sources in vehicles is problematic, particularly in determining the optimal coupling state of electric machines to vehicle wheels to ensure efficient torque distribution and prevent damage or energy wastage.
Innovation Solution
A control system that includes input means to receive fault-derived and high-speed coupling state request signals, processing means to determine the coupling state precedence, and output means to control the coupling of electric machines to vehicle wheels, deferring changes based on vehicle speed and driving mode to optimize torque distribution and prevent excessive rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric machine is selectively coupled to provide torque to vehicle wheels, then torque distribution efficiency is improved, but the complexity of managing multiple traction power sources increases
Solution Approach 1:
The patent combines multiple coupling state request signals (fault-derived, high-speed, and normal operation requests) into a single unified coupling control decision. The controller integrates these multiple input signals to determine the final coupling state of the electric machine, simplifying the management of multiple traction power sources while maintaining optimal torque distribution.
Solution Approach 2:
The controller acts as an intermediary that receives and processes multiple coupling state request signals from different sources (fault management system, high-speed protection system, and normal operation control). It mediates between these conflicting or complementary requests to determine the appropriate coupling state, thereby managing the complexity of multiple traction power sources.
2Reliability
If coupling state requests are processed in precedence order, then system reliability is improved, but response time to non-critical requests increases
Solution Approach 1:
The system establishes a predetermined precedence hierarchy for different coupling state request signals before conflicts arise. Fault-derived requests and high-speed requests are assigned higher priority in advance, so when multiple requests occur simultaneously, the controller can immediately execute the highest-priority request without delay, ensuring both reliability and timely response.
Solution Approach 2:
The controller continuously monitors and processes coupling state requests according to the established precedence rules, ensuring that the electric machine's coupling state is always optimized for current operating conditions. This continuous evaluation and adjustment maintains system reliability while minimizing unnecessary delays in response.
3Object-affected harmful factors
If the electric machine is decoupled to prevent damage, then component protection is improved, but energy wastage increases due to frequent coupling and decoupling
Solution Approach 1:
The system uses fault-derived coupling state requests that anticipate potential damage conditions before they occur. By detecting early signs of faults or abnormal operating conditions, the controller proactively adjusts the coupling state to prevent component damage, rather than reacting after damage has occurred, thereby reducing unnecessary coupling changes and energy wastage.
Solution Approach 2:
The controller continuously monitors system conditions and receives feedback from various sensors and control systems. This real-time feedback allows the controller to make informed decisions about coupling state changes, ensuring that decoupling occurs only when necessary to prevent damage, and that recoupling is timed optimally to minimize energy wastage from frequent transitions.
Data Source
AI summary
An electric machine control system for a vehicle having an electric machine arranged to be selectively couplable to provide torque to a wheel of an axle. An input receives a fault-derived coupling state request signal and a further coupling state request signal. Each coupling state request signal is indicative of a request for a coupling state of the electric machine to the wheel of the axle. A processor determines the coupling state of the electric machine to the wheel of the axle in dependence on the fault-derived coupling state request signal and the further coupling state request signal. The processor determines the coupling state of the electric machine in precedence on the fault-derived coupling state request signal over the further coupling state request signal. A coupling signal indicative of the determined coupling state is output to control coupling of the electric machine to the wheel of the axle.