Hybrid EV Engine Clutch Control for Unintended Engagement
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Solution Overview
Problem
Hybrid electric vehicles face unintended engine clutch engagement due to software or hardware errors, leading to potential dangerous situations and reduced vehicle stability.
Innovation Solution
A controller with an engine clutch monitoring part is introduced to check vehicle driving states and prohibit engine clutch engagement when certain conditions are met, such as the engine being on and the clutch open, thereby preventing clutch engagement errors and maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine clutch is engaged to transmit power from the engine to the motor, then power transmission efficiency is improved, but unintended engagement due to software or hardware errors causes vehicle stability to deteriorate
Solution Approach 1:
The control device applies preliminary anti-action by detecting engine clutch engagement status before unintended engagement can occur. When the engine clutch is detected to be engaged while the vehicle is in EV mode (motor-only operation), the control device proactively disengages the clutch or prevents engagement, thereby counteracting potential harmful effects before they manifest as stability issues.
Solution Approach 2:
The control device implements feedback by continuously monitoring engine clutch engagement status and vehicle operating mode. The control device receives feedback signals about clutch position and mode of operation, then adjusts clutch control commands accordingly to prevent unintended engagement while maintaining proper power transmission when needed.
2Reliability
If the engine clutch is kept open to prevent unintended engagement, then vehicle stability is improved, but power transmission capability deteriorates
Solution Approach 1:
The control device applies dynamics by dynamically adjusting engine clutch engagement status based on real-time vehicle operating conditions. The clutch is engaged when HEV mode is active and disengaged when EV mode is active, allowing the system to optimize between stability and power transmission capability according to current operational requirements rather than maintaining a fixed state.
Data Source
AI summary
A method of controlling a hybrid electric vehicle includes checking a vehicle driving state and determining whether to satisfy a predetermined engine clutch engagement prohibition condition, by a controller, generating and outputting a control command for prohibiting engine clutch engagement and maintaining an engine clutch in an open state, by the controller, when it is determined that the predetermined engine clutch engagement prohibition condition is satisfied from the vehicle driving state, and controlling to maintain the engine clutch in the open state that is a power cut-off state, by the control command output from the controller.