Vehicle Electric Machine Torque Control for Engine Diagnostic Testing
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Solution Overview
Problem
Management of multiple traction power sources in vehicles is problematic, particularly in hybrid electric vehicles with both internal combustion engines and electric machines, leading to inefficiencies and potential damage due to improper torque distribution.
Innovation Solution
A control system for vehicles that includes controllers to determine and control the coupling state of electric machines to vehicle wheels based on driving mode, attributes, and efficiency signals, allowing selective coupling and decoupling to optimize torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple traction power sources are used to provide torque to wheels, then vehicle power and performance are improved, but management complexity and risk of improper torque distribution increase
Solution Approach 1:
A coupling controller is introduced as an intermediary device between the multiple traction power sources and the wheels. This controller determines coupling states and manages torque distribution, simplifying the management complexity while maintaining the power benefits of multiple traction sources.
Solution Approach 2:
The system dynamically adjusts the coupling state of the electric machine based on real-time operating conditions such as vehicle speed, driving mode, and efficiency requirements. This dynamic adjustment allows the system to optimize torque distribution across different operating scenarios, resolving the management complexity issue.
2Productivity
If electric machine is selectively coupled to wheels, then torque distribution efficiency is improved, but control system complexity increases
Solution Approach 1:
The control system is segmented into distinct functional modules: input means for receiving operating condition signals, processing means for determining coupling states, and output means for controlling coupling. This segmentation organizes the control complexity into manageable components while maintaining efficient torque distribution.
Solution Approach 2:
The system uses feedback from operating condition signals (vehicle speed, driving mode, efficiency signals) to continuously adjust the coupling state of the electric machine. This feedback mechanism enables efficient torque distribution without requiring overly complex control logic, as the system automatically adapts to changing conditions.
3Loss of energy
If coupling state is determined based on multiple signals (attributes and efficiency), then vehicle efficiency is improved, but processing complexity increases
Solution Approach 1:
The processing means is designed to handle multiple types of input signals (attribute signals and efficiency signals) through a unified coupling state determination process. This multi-functional approach consolidates the processing complexity into a single versatile component rather than requiring separate processing paths for each signal type.
Data Source
AI summary
Aspects of the present invention relate to a method and to a control system for controlling at least one electric machine of a vehicle to support diagnostic testing of a vehicle system comprising an internal combustion engine, wherein the method comprises: controlling a torque output of the at least one electric machine to allow a vehicle drive torque demand to be met while the internal combustion engine is operated within at least one torque threshold for the diagnostic testing or operated at a torque setpoint for the diagnostic testing.