Hybrid Vehicle Control System Mode Shifting Torque Management
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Solution Overview
Problem
Hybrid vehicles face challenges in efficiently shifting between operating modes (low and high modes) to optimize torque delivery and prevent damage from excessive torque inputs, particularly due to irregular road conditions, which affects energy efficiency and component durability.
Innovation Solution
A control system that includes a power split mechanism with multiple rotary elements, engagement devices, and a controller to determine and adjust operating modes based on torque requirements, speed changes, and shifting times, allowing for motoring by the engine while maintaining engagement of the appropriate engagement device to achieve necessary torque and prevent excessive torque on rotary elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the hybrid vehicle propels in low mode or high mode with engine stopped, then energy efficiency is improved, but the vehicle cannot meet high torque demands or respond quickly to changing road conditions
Solution Approach 1:
The system dynamically switches between different operating modes (low mode, high mode, and engine motoring mode) based on real-time torque demands and road conditions. The controller monitors torque requirements and automatically engages the engine when high torque is needed, transitioning from static energy-efficient operation to dynamic adaptive operation that balances efficiency with power delivery capability.
2Adaptability or versatility
If the vehicle shifts operating modes frequently to adapt to irregular road conditions, then adaptability is improved, but component durability deteriorates due to excessive torque inputs
Solution Approach 1:
The controller predicts potential excessive torque inputs from irregular road conditions and proactively manages mode transitions to prevent damage. By monitoring torque requirements and road conditions, the system preemptively engages the engine or adjusts engagement devices before excessive torque can damage rotary elements, thereby protecting components while maintaining adaptability.
Solution Approach 2:
The system continuously monitors torque demands, operating conditions, and component status, using this feedback to make intelligent decisions about mode switching. The controller adjusts operating modes based on real-time feedback from sensors that detect road irregularities and torque requirements, optimizing the balance between adaptability and component protection.
3Power
If the engine is engaged to provide additional torque, then torque delivery capability is improved, but energy efficiency deteriorates
Solution Approach 1:
The system changes operational parameters by switching between different engagement states of the engagement devices and the engine. The controller adjusts the engagement status of clutches and brakes to transition between electric-only operation (high efficiency) and hybrid operation (high power), dynamically optimizing the balance between energy efficiency and torque delivery based on real-time conditions.
Data Source
AI summary
A control system for a hybrid vehicle that shift an operating mode to an appropriate mode from a low mode or high mode. The hybrid vehicle comprises a power split mechanism connected to an engine and a first motor. When a required brake torque of a prime mover cannot be achieved during propulsion in an operating mode established by engaging one of clutches while stopping the engine, the control system excites a motoring of the engine by the first motor while maintaining engagement of the clutch engaged to establish the current operating mode.