Hybrid Vehicle Paddle Regenerative Braking for Stable Stops
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Solution Overview
Problem
Hybrid vehicles experience inconsistent regenerative braking stages, leading to distinct deceleration feelings and micro movements upon stopping, which can be challenging for drivers to manage, especially in varying road conditions.
Innovation Solution
A regenerative braking control system using paddle shifts that maintains the '−' paddle shift for a predetermined time to execute regenerative braking, transitioning to hydraulic braking when the vehicle stops, with adjustable hydraulic braking based on vehicle inclination and accelerator pedal operation to stabilize the stop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If regenerative braking is divided into four or more stages with constant intervals, then the driver can feel distinct deceleration in each stage, but the driver cannot respond in real time to micro movements occurring immediately after vehicle stop
Solution Approach 1:
The patent applies dynamics by making the regenerative braking system adaptable and responsive to real-time conditions. The controller dynamically adjusts braking characteristics based on vehicle speed, acceleration demand, and stop state detection, enabling the system to transition smoothly between regenerative and hydraulic braking modes to address micro movements after stopping.
2Ease of operation
If one-pedal mode is executed to achieve complete stop using only regenerative braking, then the brake pedal operation is eliminated, but heat generation of motor increases and energy efficiency decreases
Solution Approach 1:
The patent introduces hydraulic braking as an intermediary mechanism to assist regenerative braking during the stopping process. When the vehicle reaches a stop state, the controller activates hydraulic braking to provide additional deceleration force, reducing the burden on the motor and minimizing heat generation while maintaining the one-pedal operation mode.
Solution Approach 2:
The patent changes the braking parameter by transitioning from pure regenerative braking to a combined braking mode. The controller monitors vehicle speed and acceleration demand, then adjusts the braking force distribution between regenerative and hydraulic systems, optimizing energy efficiency while maintaining ease of operation.
3Device complexity
If regenerative braking is used for complete stop, then the stopping process is simplified, but micro behavior and movements occur immediately after vehicle stop
Solution Approach 1:
The patent applies preliminary action by detecting the stop state in advance and pre-positioning hydraulic braking as a support mechanism. When the vehicle approaches a complete stop, the controller prepares the hydraulic braking system to activate immediately, ensuring stable stopping and preventing micro movements without complicating the overall stopping process.
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
Stabilizes vehicle stops by reducing motor torque and heat generation, preventing micro movements, and optimizing energy use by integrating hydraulic braking with regenerative braking.
Implementation Method 1
a regenerative braking mode in which, when the vehicle is braking or traveling due to inertia, vehicle braking energy and inertia energy are recovered from the motor through power generation to charge a battery
Implementation Method 2
the hydraulic braking may be executed to assist a vehicle stop maintaining function
Data Source
AI summary
A regenerative braking control system and a regenerative braking control method using a paddle shift of a hybrid vehicle, include a paddle switch including a first paddle shift for a down shift and a second paddle shift for an up shift, a first controller electrically connected to the paddle switch and configured to determine a deceleration control amount of regenerative braking for stopping the vehicle as a hold operation of the first paddle shift is input, and a second controller electrically connected to the first controller and configured to control a motor torque for the regenerative braking according to the deceleration control amount determined from the first controller and to control hydraulic braking of the vehicle to be executed when reaching a stop state of the vehicle.