Vehicle Collision Counter Electromotive Force Dissipation
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Solution Overview
Problem
Existing technologies are inadequate in promptly consuming the counter electromotive force generated in a running motor during a vehicle collision, as they rely on air-conditioning motors that take too long to reach the necessary rotational speed to consume this force effectively.
Innovation Solution
A vehicle system incorporating an electric resistor and a control device that electrically connects the resistor to the rotational electric machine at the time of collision to rapidly consume the counter electromotive force, utilizing a switching circuit and a backup power supply to ensure efficient energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air-conditioning motor is used to consume power remaining in a capacitor at the time of vehicle collision, then the power can be consumed, but it takes a considerable amount of time to raise the rotational speed of the air-conditioning motor to the rotational speed enabling consumption of the counter electromotive force generated in the running motor
Solution Approach 1:
The patent introduces a dedicated counter electromotive force consumption motor as an intermediary device specifically designed to consume the counter electromotive force generated during collision. This motor is pre-configured and can be rapidly activated without the startup delays associated with using an air-conditioning motor for this purpose. The consumption motor acts as a mediator between the running motor's generated electromotive force and the electrical system, enabling immediate power consumption upon collision detection.
Solution Approach 2:
The system performs preliminary configuration by having a dedicated counter electromotive force consumption motor ready and available before collision occurs. This motor is pre-positioned in the electrical system and can be immediately activated when collision is detected, eliminating the need to spin up an air-conditioning motor from idle or off-state. The preliminary preparation of the consumption motor ensures rapid response capability.
2Device complexity
If the counter electromotive force generated in the running motor at the time of vehicle collision is consumed with use of the air-conditioning motor, then the existing system can be utilized, but the counter electromotive force generated in the running motor cannot be consumed promptly
Solution Approach 1:
The patent segments the motor functions by separating the air-conditioning motor's cooling function from the counter electromotive force consumption function. Instead of trying to make the air-conditioning motor perform both functions simultaneously, a dedicated consumption motor is introduced specifically for consuming the counter electromotive force. This segmentation allows each motor to optimize its specific function without compromise.
Solution Approach 2:
The counter electromotive force consumption motor is designed as a dedicated, purpose-built component that can be rapidly activated and deactivated for the specific task of consuming counter electromotive force during collision. It is optimized for this temporary, high-power consumption task rather than being a multi-purpose motor like the air-conditioning motor, enabling faster and more efficient power dissipation.
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
The system effectively and promptly consumes the counter electromotive force generated in the rotational electric machine during a vehicle collision, preventing electrical leakage and ensuring safe energy dissipation.
Implementation Method 1
an electric resistor converting electric energy into heat energy
Implementation Method 2
a rotational electric machine generating a counter electromotive force with rotation caused by reduction of a rotational speed of wheels
Data Source
AI summary
A vehicle includes an engine, an EHC (electrical heated catalyst), a first MG (motor generator) generating a counter electromotive force at the time of vehicle collision, a battery, a PCU (power control unit) having a converter and an inverter performing power conversion between the battery and the first MG, and an ECU. The PCU is connected to the battery through an SMR (system main relay). The EHC is connected between the converter and the inverter through EHC relay. The ECU determines whether or not vehicle collision has occurred. When the vehicle collision has occurred, the ECU opens the SMR to electrically separate the battery and the PCU and closes the EHC relay to electrically connect the EHC and the first MG, so that the counter electromotive force generated in the first MG at the time of vehicle collision is consumed at the EHC.