Hybrid Vehicle Engine Clutch Safety Module Control
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Solution Overview
Problem
Hybrid vehicles face challenges in accurately controlling engine clutch hydraulic pressure, leading to potential engine clutch failures that can result in unintended behavior, risk to drivers, and vehicle damage due to the inability to detect abnormal or abnormal behavior of the engine clutch in a timely manner.
Innovation Solution
A method involving a safety module within the controller that sends signals to an actuator to control the engine clutch, ensuring it is either engaged or released appropriately, and includes mechanisms to detect and respond to failures by stopping the motor or turning off the engine to prevent hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the engine clutch hydraulic pressure is controlled based on initial hydraulic pressure and feedback hydraulic pressure, then the engine clutch can transmit torque at the kiss point, but the kiss point may change during use leading to inaccurate torque transmission
Solution Approach 1:
The safety module performs preliminary safety checks before the engine clutch engagement operation. It determines in advance whether engagement is possible by checking if the actuator has received and is executing the engagement command, preventing hazardous operations before they occur.
Solution Approach 2:
The safety module continuously monitors the engagement command transmission and actuator response in real-time. It receives feedback about whether the actuator has properly received and executed the engagement command, and adjusts control accordingly to ensure safe operation.
2Reliability
If the safety module determines engagement is not possible and stops the motor, then engine clutch safety is improved, but vehicle mobility is reduced
Solution Approach 1:
The safety module dynamically adjusts the engagement command based on real-time system state. When safety conditions are met, it permits engagement; when conditions are not met, it determines engagement is not possible and stops the motor, creating a dynamic response to changing conditions.
Solution Approach 2:
The safety module prepares safety measures in advance by monitoring system conditions before engagement occurs. If potential hazards are detected, it preemptively prevents engagement by stopping the motor, cushioning against potential harmful effects before they can manifest.
3Reliability
If the safety module continuously monitors engagement commands and actuator responses, then engine clutch failure detection is improved, but control system complexity increases
Solution Approach 1:
The safety module extracts and isolates the critical safety monitoring function from the main control system. It specifically monitors only the engagement command transmission and actuator response, separating this safety-critical monitoring from other control functions to improve reliability without overwhelming system complexity.
Data Source
AI summary
A method for preventing engine clutch hazard of a hybrid vehicle includes: transmitting, by a safety module of a controller, a signal which instructs an engine clutch to be engaged or released to a safety module of an actuator that drives the engine clutch that connects an engine with a motor or disconnects the engine from the motor; and controlling, by the safety module of the actuator, the engine clutch to perform a normal operation based on the signal.