Hybrid Vehicle Engine Clutch Stuck Breakdown Control
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Solution Overview
Problem
Hybrid vehicles face difficulties in normal operation when the engine clutch, which controls power transmission between the engine and motor, is in a stuck-breakdown condition, leading to potential engine stall due to friction material sticking and overheating, causing continuous connection and rotation at lower-than-ideal RPM.
Innovation Solution
A method and system that control the engine and transmission clutch to maintain engine speed above a predetermined target idle RPM by determining the stuck-breakdown condition of the engine clutch, injecting fuel, and adjusting the transmission clutch's state based on demand torque, including opening, locking up, or slip-controlling the clutch to prevent engine stall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine clutch is in a stuck-breakdown condition, then the friction materials are stuck together and the engine clutch maintains a lock-up state, but this causes the engine and motor to continuously connect and rotate at the same speed, leading to engine stall when RPM is at or below idle speed
Solution Approach 1:
The transmission clutch is introduced as an intermediary component between the motor and the transmission system. When the engine clutch is stuck, the transmission clutch can be controlled to disconnect the motor from the transmission, preventing the harmful effect of continuous rotation at low RPM while maintaining the engine clutch's lock-up state for normal operation
Solution Approach 2:
The system dynamically adjusts the state of the transmission clutch based on real-time detection of engine RPM and engine clutch condition. The control unit monitors whether the engine RPM is at or below idle speed and whether the engine clutch is stuck, then appropriately controls the transmission clutch to prevent engine stall while maintaining normal power transmission when conditions allow
2Stability of the object's composition
If the engine clutch friction materials are stuck together due to overheating or operating element trouble, then the clutch maintains a lock-up state, but this prevents normal hybrid vehicle operation when engine speed drops to idle RPM or below
Solution Approach 1:
The transmission clutch serves as a mediator that can be independently controlled to disconnect the motor from the transmission when the engine clutch is stuck. This allows the hybrid vehicle to operate normally by preventing the stuck clutch from causing engine stall, while maintaining the engine clutch's structural lock-up state
Solution Approach 2:
The control unit continuously monitors engine RPM and engine clutch status, and provides feedback control to the transmission clutch. When the system detects that engine RPM is at or below idle speed and the engine clutch is stuck, it activates the transmission clutch to prevent engine stall, thereby restoring normal vehicle operation
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
Enables the hybrid vehicle to run smoothly and prevent engine stall by maintaining engine speed above the target idle RPM, ensuring normal operation even when the engine clutch is in a stuck-breakdown condition.
Implementation Method 1
The stuck-breakdown condition of the engine clutch is a breakdown condition in which friction materials of the engine clutch are stuck together
Data Source
AI summary
Disclosed herein is a method and system for controlling a hybrid vehicle that can run a hybrid vehicle while preventing an engine stall when an engine clutch which controls power transmission between an engine and a motor is in a stuck-breakdown condition. The method of controlling a hybrid vehicle, which includes an engine clutch controlling power transmission between an engine and a motor, and a transmission clutch connecting the motor and an input shaft of a transmission, includes: determining whether the engine clutch is in a stuck-breakdown condition, and controlling the engine and the transmission clutch to maintain speed of the engine above a predetermined target idle RPM according to demand torque of the hybrid vehicle when the engine clutch is in a stuck-breakdown condition.