Regenerative Braking Control System for Motor-Driven Vehicles
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Solution Overview
Problem
Eco-friendly vehicles equipped with assistant brakes like exhaust, jake, or retarder brakes face increased part count, cost, and assembly complexity, while existing regenerative braking systems have limitations in converting surplus electrical energy into thermal energy for continuous braking assistance and interior heating.
Innovation Solution
A regenerative braking control system that utilizes both a brake resistor and a heater to convert surplus electrical energy into thermal energy, with a controller managing the operation of these components based on battery charge levels to achieve continuous braking assistance and interior heating without energy discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake resistor is used to convert electrical energy into thermal energy for regenerative braking, then continuous assistant braking force can be provided, but the thermal energy is discharged outside and wasted
Solution Approach 1:
The patent converts the previously wasted thermal energy from the brake resistor into a useful resource for interior heating. The control unit redirects thermal energy generated during regenerative braking to the heating system, transforming an energy loss into a beneficial function that provides both braking assistance and interior heating.
Solution Approach 2:
The brake resistor system is enhanced to serve dual functions: maintaining continuous assistant braking force while simultaneously providing interior heating. The control unit manages the thermal energy distribution to achieve both braking and heating objectives, making the system more versatile and efficient.
2Reliability
If traditional assistant brakes (exhaust brake, jake brake, or retarder brake) are equipped, then brake assist regulations are satisfied, but the number of parts increases, cost increases, and assembly convenience deteriorates
Solution Approach 1:
The electric motor is designed to perform multiple functions: propulsion during acceleration and regenerative braking during deceleration. By controlling the motor to operate as a generator during braking, the system satisfies brake assist regulations without requiring separate assistant brake devices, thereby reducing part count and simplifying the overall system.
Solution Approach 2:
The patent merges the functions of propulsion and braking into a single electric motor system. The motor serves both as a drive motor during acceleration and as a regenerative brake during deceleration, consolidating multiple functions into one component and eliminating the need for separate assistant brake devices.
3Reliability
If the battery is fully charged, then regenerative braking charging function is limited, but surplus electrical energy still needs to be converted into thermal energy for continuous braking assistance
Solution Approach 1:
When the battery is fully charged and cannot accept more regenerative braking energy, the system converts the surplus electrical energy into thermal energy through the brake resistor. This thermal energy is then redirected to the heating system, transforming what would be wasted energy into a useful heating function while maintaining continuous braking assistance.
Solution Approach 2:
The control unit dynamically adjusts the energy conversion path based on battery charge status. When the battery is fully charged, the system automatically switches from charging mode to thermal conversion mode, ensuring continuous braking assistance while utilizing surplus energy for heating, thus adapting to changing system conditions.
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 provides continuous assistant braking force through continuous reverse torque of the electric motor and achieves interior heating using thermal energy, reducing the load on the brake resistor and ensuring efficient energy utilization.
Implementation Method 1
The electric motor not only drives a vehicle, but also functions as a power generator that performs regenerative braking for assisting braking when the vehicle is decelerated or coasts on a downhill road, and charges a battery by converting kinetic energy of a vehicle into electrical energy.
Implementation Method 2
a brake resistor that performs regenerative braking using an electric motor and discharges electrical energy produced by an electric motor as thermal energy
Implementation Method 3
A regenerative braking control system for a motor-driven vehicle includes: an electric motor configured to charge a battery with an electrical energy by operating as a power generator in regenerative braking; a brake resistor configured to convert surplus electrical energy produced by the electric motor into thermal energy in regenerative braking; a heater configured to convert surplus electrical energy produced by the electric motor into thermal energy together with the brake resistor
Implementation Method 4
a cooling water circulation line connected to the brake resistor and the heater so that cooling water can circulate
Data Source
AI summary
A regenerative braking control system for a motor-driven vehicle is configured to provide a continuous assistant braking force by continuous reverse torque of an electric motor by enabling surplus electrical energy produced by an electric motor to be easily converted into thermal energy in generative braking, using both of a brake resistor and a heater to convert electrical energy into thermal energy, and being able to obtain an interior heating effect by using thermal energy converted by the brake resistor and the heater as heat source for interior heating without discharging the thermal energy to the outside.