Electric Vehicle Third Braking Device for Wheel Brake Overheating
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Solution Overview
Problem
Electric vehicles without an engine in the power transmission path face issues with frequent overheating of the wheel brake due to reliance on regenerative braking, which is restricted by battery charge, and require significant design changes for alternative braking methods like air resistance or road surface resistance.
Innovation Solution
Incorporating a third braking device in the power transmission path between the rotating machine and the drive wheel, such as an electromagnetic retarder, to generate braking force when regenerative braking is unavailable, along with a speed reducing mechanism and differential device configuration to facilitate compact and efficient installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is used as the primary braking method, then energy recovery is improved, but wheel brake overheating occurs when battery charge is restricted
Solution Approach 1:
An electromagnetic retarder is introduced as an intermediary braking device between the rotating machine and drive wheels. This retarder generates retarding force through electromagnetic induction without direct mechanical contact, serving as a mediator that reduces reliance on friction-based wheel brakes and prevents overheating while complementing regenerative braking functionality.
Solution Approach 2:
The patent replaces traditional mechanical friction braking with an electromagnetic braking system. The electromagnetic retarder converts mechanical energy directly to electrical energy through electromagnetic induction, eliminating the need for friction-based wheel brakes and their associated overheating problems.
2Reliability
If air resistance variable means or road surface resistance variable means is used as third braking device, then braking force is provided when regenerative brake is unusable, but equipment scale increases and design changes become significant
Solution Approach 1:
The electromagnetic retarder serves multiple functions: it provides regenerative braking by generating electrical energy during deceleration, acts as a third braking device when regenerative braking is unavailable, and functions as a speed control device. This multi-functionality eliminates the need for separate air resistance or road surface resistance variable means, reducing overall system complexity.
Solution Approach 2:
The patent combines the third braking device functionality with the existing rotating machine and power transmission system. The electromagnetic retarder is integrated into the power transmission path between the rotating machine and drive wheels, merging braking functionality with the existing drivetrain rather than adding separate standalone systems.
3Temperature
If third braking device is disposed in power transmission path, then wheel brake usage is reduced and overheating is suppressed, but device integration complexity increases
Solution Approach 1:
The electromagnetic retarder is nested within the existing power transmission system, utilizing the space and structural framework already present in the drivetrain. The retarder is disposed in the power transmission path between the rotating machine and drive wheels, nesting the braking function within the existing mechanical architecture rather than requiring external additions.
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
This solution suppresses frequent use of the wheel brake, allows for easy integration without significant design changes, and provides effective braking without the need for fluids or complex structures, improving rotation balance and reducing vibration.
Implementation Method 1
a third braking device disposed in a power transmission path between the rotating machine and a drive wheel to generate a braking force with a braking method other than regeneration
Data Source
AI summary
An electric vehicle without a propeller shaft including a rotating machine selectively functioning as an electric motor and a generator, configured to serve as a drive force source in the vehicle when the rotating machine functions as the electric motor, and functioning as the generator during running of the vehicle to thereby generate a regenerative brake force, and a wheel brake disposed on a wheel, used as a service brake, and generating a braking force corresponding to a brake request amount during running of the vehicle, the electric vehicle comprising: a third braking device disposed in a power transmission path between the rotating machine and a drive wheel to generate a braking force with a braking method other than regeneration during running of the vehicle.