Coasting Feedback Torque Control for Hybrid Vehicles
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Solution Overview
Problem
Current coasting feedback control methods for hybrid electric vehicles do not fully maximize energy recycling while ensuring driving comfort, as they do not adequately consider driver experience and the state of the power system, leading to inefficiencies in energy feedback and increased mechanical braking wear.
Innovation Solution
A coasting feedback control method that includes a vehicle system with an engine unit, transmission unit, motor generators, and a power switching device, which detects pedal positions and speed to distribute coasting feedback torque according to a selected curve, optimizing energy recycling, comfort, and steering capability, and allowing for torque compensation and multiple operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rated deceleration curve is used in coasting feedback control, then the control system is simple to implement, but energy feedback efficiency is not maximized and driver experience is not fully considered
Solution Approach 1:
The patent implements dynamic coasting feedback torque curves that adapt to real-time vehicle conditions including battery state of charge, motor operating state, and vehicle speed. The control system selects from multiple pre-defined torque curves (first, second, third curves) based on current power system state, enabling the system to dynamically optimize energy recovery while maintaining driving comfort. This resolves the contradiction by moving from a static, simple control approach to a dynamic, condition-based approach that maximizes energy feedback efficiency.
Solution Approach 2:
The patent changes the parameters of the coasting feedback torque by selecting different torque curves based on battery state of charge and motor operating conditions. When battery charge is high, a gentler torque curve is selected; when charge is low, a stronger torque curve is selected. This parameter adjustment allows the system to optimize energy recovery under different conditions while maintaining simplicity through pre-defined curve selection rather than complex real-time calculation.
2Loss of energy
If coasting feedback torque is increased to maximize energy recycling, then energy feedback efficiency improves, but mechanical braking wear increases and driving comfort deteriorates
Solution Approach 1:
The patent implements a feedback control system that continuously monitors battery state of charge, motor operating state, and vehicle speed to determine the appropriate coasting feedback torque curve. The system provides feedback to the driver through the accelerator pedal and provides feedback to the brake system to coordinate mechanical braking. This multi-level feedback mechanism ensures that energy recovery is maximized while preventing excessive torque that would cause mechanical braking wear or compromise driving comfort.
Solution Approach 2:
The patent introduces the coasting feedback torque as an intermediary between the driver's braking input and the actual braking force applied. The feedback torque curve acts as a mediator that modifies the driver's braking request based on power system conditions, enabling energy recovery while reducing the mechanical braking load. This intermediary mechanism allows the system to recover energy without directly increasing mechanical braking wear.
3Loss of energy
If multiple motor generators are used to distribute coasting feedback torque, then energy recycling and driving comfort are optimized, but device complexity increases
Solution Approach 1:
The patent segments the coasting feedback torque distribution between two motor generators (first and second motor generators), allowing independent control of torque applied to the engine and torque applied to the wheels. This segmentation enables optimized energy recovery by directing torque to the most appropriate component based on real-time conditions, while maintaining manageable complexity through modular control of each motor generator's contribution to the overall feedback torque.
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 enhances energy feedback efficiency, reduces mechanical braking wear, and improves fuel economy by maximizing energy recycling and adapting to different driving conditions while maintaining driving comfort.
Implementation Method 1
a first motor generator coupled with the transmission unit... a second motor generator configured to drive at least one of front and rear wheels... controlling the vehicle to enter a coasting feedback control mode, where when the vehicle is in the coasting feedback control mode, a coasting feedback torque of the first motor generator and a coasting feedback torque of the second motor generator are distributed
Data Source
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AI summary
The present disclosure discloses a vehicle and a coasting feedback control method for the same. The coasting feedback control method includes the following steps: detecting the current speed of a vehicle, the depth of a braking pedal of the vehicle, and the depth of a throttle pedal; and when the current speed of the vehicle is greater than a preset speed, both the depth of the braking pedal and the depth of the throttle pedal are 0, and the current gear of the vehicle is gear D, when the vehicle is not in a cruise control mode and an anti-lock braking system of the vehicle is in a non-working state, controlling the vehicle to enter a coasting feedback control mode, where when the vehicle is in the coasting feedback control mode, a coasting feedback torque of a first motor generator and a coasting feedback torque of a second motor generator are distributed according to a selected coasting feedback torque curve of the vehicle.