Hybrid Engine Clutch Opening via HSG Torque Convergence
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Solution Overview
Problem
Existing methods for opening an engine clutch in hybrid vehicles often result in reduced fuel efficiency due to prolonged fuel injection during mode shifts from HEV to EV, as they maintain engine operation in low torque areas to prevent physical slip.
Innovation Solution
A method that applies an opening control signal for the engine clutch, using HSG torque converged with engine friction torque to set the input torque of the engine clutch to zero, thereby reducing fuel injection time and avoiding physical slip by terminating fuel injection and adjusting HSG torque to match engine friction torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel injection is maintained during engine clutch opening to prevent physical slip, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent changes the torque parameter by converging HSG torque to engine friction torque, allowing the input torque to be reduced to zero while maintaining reliable clutch opening without physical slip
Solution Approach 2:
The HSG acts as an intermediary device to apply counter-torque that converges with engine friction torque, enabling precise control of input torque to zero during clutch opening, thereby preventing physical slip while avoiding prolonged fuel injection
2Manufacturing precision
If fuel injection time is extended to ensure engine torque reaches zero, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The patent implements feedback control by monitoring engine friction torque and adjusting HSG torque accordingly to converge with the friction torque, ensuring precise achievement of zero input torque without excessive fuel injection duration
Solution Approach 2:
The system dynamically adjusts HSG torque parameter to match engine friction torque, enabling precise torque control that achieves zero input torque faster than conventional methods, thereby reducing fuel injection time while maintaining control precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances fuel efficiency by reducing energy consumption and fuel injection amount, saving approximately 67,892 kJ of electric energy and minimizing fuel injection time, thus improving overall fuel efficiency during mode shifts.
Implementation Method 1
using HSG torque converged with engine friction torque to set the input torque of the engine clutch to zero
Implementation Method 2
engine friction torque
Data Source
AI summary
A system and method for opening an engine clutch of a hybrid vehicle are provided. The method and system enhance fuel efficiency by saving a fuel injection amount based on a fuel injection time of an engine, by adjusting an input torque of an engine clutch to be zero by applying a Hybrid Starter Generator (HSG) torque connected to the engine while reducing the fuel injection time into the engine from the time when the opening of the engine clutch starts to adjust.