Electric Motor Regenerative Braking With Voltage Boost
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Solution Overview
Problem
Electrically driven vehicles face limitations in generating sufficient braking power, particularly at high speeds, due to the thermal stress caused by machine current in conventional braking systems, which are insufficient for prolonged braking needs like slope control or emergency stops.
Innovation Solution
A method that adjusts the generator output of the electric driving engine by increasing the voltage level while lowering or maintaining current, allowing for enhanced braking power without exceeding thermal limits, and complements existing brake systems like retarders and friction brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the machine current is increased to generate higher braking power, then the braking effect is improved, but the thermal stress on the traction machine increases
Solution Approach 1:
The patent changes the voltage parameter of the electrical system. By increasing the voltage level at which the driving engine operates as a generator, the system can produce the same braking power with lower current, thereby reducing thermal stress on the traction machine while maintaining effective braking capability
2Temperature
If the voltage level is increased to reduce machine current, then the thermal load is decreased, but the system complexity increases
Solution Approach 1:
The patent makes the electrical system perform multiple functions: during driving mode, it operates as a motor propelling the vehicle; during braking mode, it operates as a generator providing regenerative braking. By increasing the operating voltage level, the same multi-functional system achieves reduced thermal load without adding separate braking-specific equipment, thus limiting the increase in system complexity
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 method increases braking power and reduces thermal load on the engine, enabling effective braking in both permanent and service brake cases, while potentially reducing the load on conventional brake systems and saving costs by distributing the braking effort across multiple engines.
Implementation Method 1
Generating a generator output by the driving engine by driving the driving engine in overrun mode by the vehicle
Implementation Method 2
Increasing a first voltage level, at which the driving engine is operated, to adjust the generator output to an amount required for the braking
Data Source
AI summary
A method for braking a vehicle driven by an electric driving engine is disclosed, wherein the braking is at least partially performed by the driving engine. The method includes generating a generator output by the driving engine by driving the driving engine in overrun mode by the vehicle, increasing a first voltage level, at which the driving engine is operated, to adjust the generator output to an amount required for the braking, and providing the generator output adjusted to the required amount.