Electric Vehicle Pump Motor Inverter Protection Circuit
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Solution Overview
Problem
In electric vehicles, the sudden stop of the cooling system due to collisions or accidents can cause the pump motor to generate a counter electromotive force, potentially damaging it as the current is not dissipated effectively.
Innovation Solution
An electric vehicle system that includes a capacitor to absorb the counter electromotive force generated by the pump motor, with a controller that disconnects the pump inverter from the power source and connects it to the capacitor during a collision or sudden stop, converting the AC power into DC power and storing it in the capacitor to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling system is suddenly stopped due to collision or accident, then the vehicle safety is improved, but the pump motor generates counter electromotive force that can damage it
Solution Approach 1:
The patent introduces a diode as an intermediary component between the pump motor and the power supply system. This diode acts as a one-way valve for current flow, allowing the counter electromotive force generated by the pump motor during sudden stops to be dissipated safely through the diode rather than damaging the motor itself, thus protecting the pump motor while maintaining the ability to suddenly stop the cooling system for safety
2Duration of action of moving object
If the pump continues rotating due to inertial force after power supply is stopped, then the cooling medium flow is maintained, but the counter electromotive force damages the pump motor
Solution Approach 1:
The patent converts the harmful counter electromotive force generated during pump deceleration into a beneficial protective mechanism. By providing a diode that directs this counter electromotive force into a safe dissipation path, the system allows the pump to continue rotating longer due to inertial force (maintaining cooling flow) while the previously harmful electrical effect is now safely utilized to protect the motor from damage
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
Prevents damage to the pump motor by dissipating the counter electromotive force through the capacitor, ensuring the vehicle's cooling system operates safely during sudden stops or collisions.
Implementation Method 1
a capacitor that stores a counter electromotive force generated by the pump
Implementation Method 2
the pump itself continues rotating due to an inertial force of the cooling medium that has been flowing. This causes a motor of the pump to generate a counter electromotive force
Data Source
AI summary
An electric vehicle includes a wheel-driving motor, a motor inverter that supplies electric power to the wheel-driving motor, a pump that delivers a cooling medium to at least one of the motor inverter and the motor, a capacitor that stores a counter electromotive force generated by the pump, and a pump inverter that supplies electric power to the pump to drives the pump. When a vehicle controller receives a signal indicating a collision of the vehicle, the vehicle controller stops a supply of electric power from the pump inverter to the pump and connects the pump inverter to the capacitor. The pump inverter converts AC power generated by the counter electromotive force of the pump into DC power to store the DC power in the capacitor.