Hybrid Vehicle Drivetrain Control for Low-Range Electric Mode
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Solution Overview
Problem
Hybrid vehicles with configurable drivetrains in low-range mode face inefficiencies and unpredictable mode transitions between electric-only and parallel modes, leading to unnecessary engine activation and compromised driver control, especially in off-road conditions.
Innovation Solution
A method and control system that determine whether the drivetrain is in low-range mode and the powertrain is in electric mode, inhibiting engine operation in such cases to maintain electric-only mode, except when insufficient electrical energy is available, thereby optimizing torque control and predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the powertrain operates in parallel mode when drivetrain is in low-range mode, then maximum power is available, but efficiency deteriorates due to unnecessary engine activation
Solution Approach 1:
The system dynamically adjusts the powertrain operating mode based on real-time drivetrain mode detection. When low-range mode is detected, the control system adapts by permitting electric-only mode operation instead of forcing parallel mode, optimizing the balance between power availability and energy efficiency according to actual driving conditions.
Solution Approach 2:
The invention changes the operational parameters of the powertrain system by modifying the mode transition logic. Specifically, it adjusts the threshold conditions for engine activation based on the drivetrain mode, allowing the system to operate in electric-only mode during low-range gear operation, thereby reducing energy consumption while maintaining sufficient performance.
2Power
If automatic mode transition is implemented, then power availability is optimized, but driver perception of vehicle response deteriorates due to unpredictable transitions
Solution Approach 1:
The system implements feedback by continuously monitoring the drivetrain mode and using this information to control powertrain mode transitions. This closed-loop control ensures that mode changes occur predictably based on actual drivetrain state, improving driver perception of vehicle response while maintaining optimal power availability.
Solution Approach 2:
The control system performs preliminary detection of the drivetrain mode before initiating powertrain mode transitions. By anticipating the appropriate powertrain mode based on the detected drivetrain state, the system ensures smooth and predictable transitions that enhance driver perception of vehicle response.
3Loss of energy
If electric-only mode is allowed in low-range mode, then energy efficiency is improved, but power availability deteriorates in certain off-road conditions
Solution Approach 1:
The system dynamically adjusts power availability based on detected driving conditions and drivetrain mode. When insufficient electrical energy is detected or demanding off-road conditions are identified, the system adapts by activating the engine to supplement power, ensuring adequate power availability while maintaining energy efficiency during normal low-range operation.
Solution Approach 2:
The invention creates a universal control strategy that adapts to multiple operating conditions. The powertrain control system can operate in electric-only mode for efficiency during normal low-range driving, while automatically transitioning to parallel mode when additional power is demanded, providing a multi-functional solution that addresses both efficiency and power availability requirements.
Data Source
AI summary
The present application describes a method of controlling a vehicle, wherein the vehicle comprises a hybrid powertrain including an electric propulsion system, an engine and a drivetrain that is configurable in a low-range mode or a high-range mode. The method comprises determining whether the low-range mode for the drivetrain is selected, determining whether an electric mode for the powertrain is selected, and inhibiting operation of the engine if both the low-range mode and the electric mode are selected.