Hybrid Vehicle DCT Braking Control for Clutch Stuck Off
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Solution Overview
Problem
Hybrid vehicles with dual-clutch transmission (DCT) face issues with clutch failure, leading to unstable braking and reduced fuel efficiency due to clutch stuck off conditions, where mechanical braking force is insufficient, and regenerative braking is compromised.
Innovation Solution
A control method and system that monitors clutch stuck off, switches to a single clutch driving mode, prohibits regenerative braking, and relies on mechanical braking force for stability, while allowing regenerative braking to be reinstated when safe, to ensure braking force and improve fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is used extensively to improve fuel efficiency, then fuel efficiency is improved, but braking stability deteriorates when clutch stuck off occurs
Solution Approach 1:
The controller continuously monitors clutch operation status and provides feedback to determine whether regenerative braking can be safely used. When clutch stuck off is detected, the controller switches to mechanical braking mode, ensuring braking stability while maintaining fuel efficiency during normal operation
Solution Approach 2:
The braking system dynamically switches between regenerative braking and mechanical braking modes based on real-time clutch status. This dynamic adaptation allows the system to maximize fuel efficiency through regenerative braking when clutches are functional, while ensuring braking stability by switching to mechanical braking when clutch failure is detected
2Reliability
If clutch stuck off occurs and mechanical braking force is used, then braking stability is maintained, but fuel efficiency deteriorates due to loss of regenerative braking
Solution Approach 1:
The braking system is segmented into two independent pathways: regenerative braking pathway and mechanical braking pathway. When clutch stuck off occurs, the system seamlessly transitions from the regenerative pathway to the mechanical pathway, maintaining braking stability while isolating the failure impact to preserve overall system functionality
3Ease of operation
If single clutch driving mode is activated to maintain drivability, then vehicle operation is maintained, but braking control complexity increases
Solution Approach 1:
The controller acts as an intermediary that automatically manages the complexity of coordinating single clutch driving mode with braking operations. By centralizing control logic in the controller, the system maintains simple operation for the driver while the controller handles the complex coordination of clutch status monitoring, braking mode selection, and force distribution
Data Source
AI summary
A control method and system for a hybrid vehicle with a DCT is provided. The method includes monitoring whether clutch stuck off is sensed and requesting prohibition of regenerative braking by a driving motor and requesting braking control using mechanical braking force to a higher controller when clutch stuck off is sensed. A driving mode is then changed into a single clutch driving mode, in which a vehicle is driven in gear stages realized by a clutch other than the clutch in which the clutch stuck off occurred and the higher controller is requested to prohibit regenerative braking by the driving motor, when clutch stuck off has occurred. Additionally, the higher controller is requested to obtain the braking force for the vehicle from mechanical braking force is response to determining that single clutch shifting has been performed and braking is required.