Electromagnetic Clutch Backup Power Control for Hybrid Vehicles
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Solution Overview
Problem
Hybrid power systems in vehicles lack a control strategy for clutch voltage failure, leading to safety and reliability issues when the low-voltage battery fails, causing the electromagnetic clutch to default open and resulting in vehicle breakdowns.
Innovation Solution
A control method for a bi-stable electromagnetic clutch in a hybrid power system that includes a low-voltage battery, a standby power supply system, and a switching circuit to ensure continuous operation by switching to the standby power when the low-voltage battery fails, maintaining clutch engagement for hybrid power drive and using vehicle speed signals to manage engagement commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low-voltage battery fails, then the electromagnetic clutch defaults to open state, but the vehicle power system loses reliability and may break down
Solution Approach 1:
The system performs preliminary action by switching to the standby power supply system before the electromagnetic clutch fails. The control method monitors battery voltage and proactively switches power sources when voltage drops below the threshold, ensuring the clutch controller remains operational and can maintain proper clutch engagement, thereby preventing vehicle breakdown
Solution Approach 2:
The system provides beforehand cushioning by having a standby power supply system ready to compensate for low-voltage battery failure. This redundant power source acts as a cushion against the harmful effect of battery failure, ensuring continuous operation of the electromagnetic clutch controller and maintaining vehicle power system reliability
2Reliability
If the electromagnetic clutch is always engaged to maintain hybrid power drive, then safety is improved, but excessive vehicle speed may cause damage
Solution Approach 1:
The system applies feedback by continuously monitoring vehicle speed and using this information to control clutch engagement. The control method reads vehicle speed signals and adjusts clutch engagement accordingly - maintaining engagement for safety when speed is appropriate, but disengaging when speed exceeds safe thresholds to prevent damage, thus resolving the contradiction between safety and harmful effects
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
Ensures the safety and reliability of the hybrid power system by maintaining clutch engagement when the low-voltage battery fails, preventing vehicle breakdowns and ensuring hybrid power operation, while also preventing damage from excessive vehicle speed.
Implementation Method 1
an electromagnetic clutch controller... using the electromagnetic clutch controller to judge an engaged or disengaged state of the electromagnetic clutch; and further controlling the electromagnetic clutch
Data Source
AI summary
A hybrid power system comprises an engine, a motor, an electromagnetic clutch, an electromagnetic clutch controller and a power supply system. The power supply system comprises: a low-voltage battery, a standby power supply system and a switching circuit. The electromagnetic clutch is used to control connection of the motor. A control method comprises: monitoring whether a voltage of the low-voltage battery is lower than a target value, and judging whether the low-voltage battery fails; using the switching circuit to switch to the standby power supply system to supply power to the electromagnetic clutch and the electromagnetic clutch controller; using the electromagnetic clutch controller to judge an engaged or disengaged state of the electromagnetic clutch; and further controlling the electromagnetic clutch according to the engaged or disengaged state. When the low-voltage battery power supply fails, the switching circuit switches to the standby power supply system to supply power.