Vehicle Frame-Integrated Energy Dissipation for Emergency Braking
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Solution Overview
Problem
Existing electric vehicles lack a compact and cost-effective dissipator device to safely manage high-power, short-duration electrical energy generated during emergency braking, especially when the storage system is fully charged, and traditional mechanical braking systems are cumbersome and require air flow for heat disposal.
Innovation Solution
An automobile with an energy dissipator device utilizing electrical resistances integrated into the frame to generate heat through Joule effect, coupled with the frame to dissipate energy, and optionally an expendable endothermic material to manage excess energy, ensuring safe and efficient braking without mechanical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional dissipator device with electrical resistance and air cooling is used, then high-power electrical energy can be dissipated during emergency braking, but the device becomes cumbersome and requires constant air flow for heat disposal
Solution Approach 1:
The dissipator device is integrated into the automobile frame structure, merging the braking energy dissipation function with the structural frame. The electrical resistance elements are incorporated as part of the frame itself rather than as separate components, eliminating the need for dedicated cooling systems and air flow paths.
Solution Approach 2:
The frame structure serves dual purposes: providing structural support and acting as the dissipator device. The frame's mass and thermal properties are utilized to absorb and dissipate braking energy, making the system self-sufficient without requiring external cooling infrastructure.
2Weight of moving object
If mechanical braking systems are eliminated to reduce costs and weight, then weight and space are reduced, but safety is compromised during emergency braking when electrical energy cannot be absorbed by the storage system
Solution Approach 1:
The traditional mechanical braking system is replaced with an electrical braking system using the electric machine as a generator. The dissipator device handles emergency braking energy that cannot be stored, maintaining safety while eliminating mechanical brake components on rear wheels.
Solution Approach 2:
The electric machine serves multiple functions: propulsion during acceleration, regenerative braking during normal braking, and the dissipator device handles emergency energy disposal. This multi-functionality eliminates the need for separate mechanical braking systems while maintaining safety.
3Loss of energy
If electrical resistance dissipator is used, then electrical energy can be converted to heat, but the device requires constant air flow and communication with air intake for heat disposal
Solution Approach 1:
The dissipator device is integrated into the automobile frame structure, merging the braking energy dissipation function with the structural frame. The electrical resistance elements are incorporated as part of the frame itself rather than as separate components, eliminating the need for dedicated cooling systems and air flow paths.
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 solution provides a compact, cost-effective, and safe means to dissipate high-power electrical energy during emergency braking, reducing weight and space requirements while maintaining effective braking performance, with optional expendable materials for emergency use.
Implementation Method 1
a dissipator device comprises an electrical resistance which converts electrical energy into heat through Joule effect
Implementation Method 2
at least one expendable endothermic material arranged inside the hollow part and configured to undergo an endothermic reaction
Implementation Method 3
an expendable endothermic material arranged inside the hollow part and configured to undergo an endothermic reaction
Data Source
Figure 1
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AI summary
An automobile (1) having: a frame (2) provided with a plurality of metal elements (9) interconnected with one another; at least one drive wheel (4); at least one electric motor (5) connected to the drive wheel (4); an electronic power converter (7) which controls the electric motor (5); and a dissipator device (10), which is connected to the electronic power converter (7), is configured to dissipate electrical energy and has at least one electrical resistance (11) which is configured to generate heat through Joule effect and is thermally coupled to at least one corresponding metal element (9) of the frame (2) to transmit heat, through conduction, to the corresponding metal element (9).