Hybrid Starter Generator Regenerative Braking Control
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Solution Overview
Problem
In hybrid vehicles, excess deceleration energy generated during braking exceeds the motor's generating capacity, leading to inefficiencies in regenerative braking systems, which results in unutilized energy and increased fuel consumption.
Innovation Solution
A regenerative braking apparatus and method that utilize a controller to manage the Hybrid Starter Generator (HSG) and motor, determining additional torque and friction torque to decide whether to regeneratively brake the motor or HSG, and maximize turbocharger opening and shift speed to minimize friction torque, thereby optimizing energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the motor operates as a generator to regenerate braking energy, then electrical energy is recovered and charged to the battery, but the regenerative braking capacity is limited by the motor's generating capacity
Solution Approach 1:
The patent combines the motor and HSG into a unified regenerative braking system where both components operate simultaneously as generators. The motor handles primary regenerative braking while the HSG captures excess deceleration energy that exceeds the motor's generating capacity, merging their capabilities to overcome individual power limitations.
Solution Approach 2:
The HSG is designed to perform multiple functions: it acts as a starter motor for engine startup, a generator for electrical energy generation during engine operation, and an additional regenerative braking device when deceleration energy exceeds motor capacity. This multi-functionality allows the system to maximize energy recovery across different operating conditions.
2Loss of energy
If the HSG is used to brake the vehicle when deceleration energy exceeds motor capacity, then excess energy can be regenerated, but the system complexity increases
Solution Approach 1:
The HSG serves multiple functions including engine starting, electrical energy generation, and regenerative braking. By utilizing an existing multi-functional component rather than adding a dedicated third generator, the system recovers excess energy without proportionally increasing system complexity.
Solution Approach 2:
The controller automatically manages the coordination between motor and HSG based on real-time operating conditions, deceleration energy levels, and component capabilities. This self-managing control strategy reduces the need for complex external control systems and simplifies operation.
3Loss of energy
If the motor operates at maximum torque during regenerative braking, then energy recovery efficiency is maximized, but the available torque for vehicle assistance is reduced
Solution Approach 1:
The system merges the torque contributions of both motor and HSG during regenerative braking. When the motor operates at maximum torque for efficient energy recovery, the HSG provides additional regenerative braking torque, ensuring the total braking force requirement is met while maximizing overall energy recovery capacity.
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 effectively regenerates excess deceleration energy, reducing fuel consumption by efficiently managing the braking process through the HSG and motor operations, even when deceleration energy exceeds the motor's capacity.
Implementation Method 1
The motor operates as a generator in braking of the vehicle, and generates a braking force by transforming kinetic energy generated in braking to electrical energy
Implementation Method 2
a Hybrid Starter Generator (HSG) starting the engine and generating electrical energy by operating as a generator when the engine is in an on state
Implementation Method 3
an engine generating power by combustion of fuel
Data Source
AI summary
A regenerative braking apparatus of a hybrid vehicle may include an engine generating power by combustion of fuel, an HSG starting the engine and generating electrical energy by operating as a generator when the engine is in an on state, a motor assisting the power of the engine, being operated as a generator and generating electrical energy in braking, and a controller controlling such that a hybrid vehicle is braked by regenerative braking according to an operation of the HSG when deceleration energy in braking is higher than a generating capacity of the motor.