Regenerative Braking Control via Speed-Adaptive Force Modulation
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Solution Overview
Problem
Existing regenerative braking systems in motor vehicles face challenges in optimizing drive comfort and braking action intensity, often resulting in suboptimal performance during deceleration and braking phases, as they rely on a single control member for both dissipative and regenerative braking systems.
Innovation Solution
A regenerative braking method that utilizes a computer and control device to dynamically adjust the intensity of the regenerative braking action based on vehicle speed and driver input, using sensors to detect actions on the dissipative braking control member and generate signals for the regenerative braking system, allowing for progressive and adaptive application of braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the regenerative braking system is activated when the driver releases the accelerator pedal, then energy regeneration is achieved, but drive comfort is compromised due to abrupt braking action
Solution Approach 1:
The patent applies dynamics by making the regenerative braking force variable rather than constant. The control device dynamically adjusts the braking force based on real-time detection of dissipative braking force, vehicle speed, and accelerator pedal position, transforming the static braking activation into a dynamic, adaptive process that resolves the contradiction between energy recovery and comfort
Solution Approach 2:
The patent changes the parameter of braking force intensity from a fixed value to a variable parameter that depends on multiple factors including dissipative braking force magnitude, vehicle speed, and accelerator pedal position. This parameter transformation allows the system to optimize both energy regeneration and drive comfort under different operating conditions
2Ease of operation
If the braking force produced by the regenerative braking system is controlled according to the speed with which the foot is lifted from the accelerator pedal, then drive comfort is improved, but the intensity of the braking action is not always optimal for energy regeneration
Solution Approach 1:
The patent makes the control device universal by integrating multiple control functions into a single system. The control device simultaneously processes accelerator pedal position signals, dissipative braking force signals, and vehicle speed signals to generate regenerative braking force commands, enabling one device to perform multiple functions and resolve the contradiction between comfort-oriented and energy-oriented control strategies
Solution Approach 2:
The patent implements feedback by using the detected dissipative braking force as a input signal for controlling the regenerative braking force. This feedback loop allows the system to continuously adjust the regenerative braking intensity based on actual braking conditions, ensuring both comfort and energy optimization
3Device complexity
If a single control member is used for both dissipative and regenerative braking systems, then device complexity is reduced, but the ability to optimize both braking functions independently is limited
Solution Approach 1:
The patent applies segmentation by separating the control functions for dissipative and regenerative braking systems. The control device independently processes signals from the accelerator pedal and brake pedal, and independently controls the regenerative braking force based on these separate inputs, allowing each braking function to be optimized without interfering with the other while maintaining relatively simple device architecture
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 approach enhances the energy regeneration level and comfort for vehicle occupants by optimizing regenerative braking intensity according to speed and driver input, reducing discomfort at high speeds and maximizing energy regeneration at low speeds, while minimizing unnecessary deceleration and reacceleration.
Implementation Method 1
The regenerative braking system converts the kinetic energy of the motor vehicle into an energy, for example electrical or mechanical, which can be stored in the vehicle then reused subsequently
Data Source
AI summary
A regenerative braking method for a motor vehicle, in which the regenerative braking action is applied progressively, a rate of application of the braking action being dependent on a speed of the motor vehicle.