Braking Force Control for Vehicle Nose Dive Prevention
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Solution Overview
Problem
Electric and hybrid vehicles experience frequent nose dive phenomena during braking due to uneven weight distribution, as regenerative braking concentrates weight on the front wheels, leading to instability and reduced riding comfort.
Innovation Solution
A braking force control system that dynamically distributes braking forces between regenerative and friction braking, using a braking force calculating unit, distributing unit, and nose dive determining unit to adjust the application of regenerative and friction braking forces at the front and rear wheels, minimizing electronic control suspension (ECS) damping control to prevent nose dive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is preferentially applied to front wheels to enhance fuel efficiency, then fuel efficiency is improved, but weight concentrates on front wheels causing nose dive phenomenon
Solution Approach 1:
The braking force distributing unit dynamically adjusts the distribution of regenerative and friction braking forces between front and rear wheels based on real-time detection of nose dive phenomenon. When nose dive is detected, the system increases rear wheel braking force and decreases front wheel braking force, creating a dynamic response that counteracts the static weight concentration problem caused by preferential regenerative braking at front wheels.
Solution Approach 2:
The system changes the braking force parameters by redistributing the total braking force requirement between regenerative and friction braking components, and between front and rear wheels. The braking force distributing unit calculates and adjusts the magnitude of braking forces applied to each wheel based on vehicle state, thereby changing the force distribution parameters to prevent nose dive while maintaining fuel efficiency benefits.
2Stability of the object's composition
If electronic control suspension increases damping force to prevent nose dive, then nose dive phenomenon is prevented, but device complexity and energy consumption increase
Solution Approach 1:
The patent replaces the mechanical ECS damping control system with a braking force redistribution mechanism. Instead of using the suspension system's dampers to counteract nose dive, the system uses the braking force distributing unit to adjust braking forces between wheels, substituting a mechanical control approach with a force distribution approach that is already part of the braking system.
Solution Approach 2:
The braking force distributing unit performs multiple functions: it manages the distribution between regenerative and friction braking to enhance fuel efficiency, and simultaneously prevents nose dive phenomenon by adjusting front-rear braking force distribution. This multi-functionality eliminates the need for separate ECS damping control, reducing device complexity while achieving nose dive prevention.
3Stability of the object's composition
If braking force is simultaneously applied to both front and rear wheels in fossil fuel vehicles, then weight distribution is balanced, but fuel efficiency is reduced compared to regenerative braking
Solution Approach 1:
The braking force is segmented into multiple components: regenerative braking force and friction braking force, with further segmentation between front and rear wheels. The braking force distributing unit independently controls the magnitude of each segment, allowing regenerative braking to be preferentially applied to front wheels for fuel efficiency while using friction braking at rear wheels to prevent nose dive, thus resolving the contradiction between fuel efficiency and weight distribution.
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
Effectively prevents nose dive phenomena by optimizing the distribution of braking forces, reducing the need for excessive ECS damping control, thereby enhancing vehicle stability and comfort during braking.
Implementation Method 1
a braking system configured to apply a friction braking force by a friction braking device and a regenerative braking force by a motor
Implementation Method 2
a braking system configured to apply a friction braking force by a friction braking device
Data Source
AI summary
In a braking force control system for a vehicle, braking is performed by distributing a braking force required for braking the vehicle to the regenerative braking force and the friction braking force. The regenerative braking force and the friction braking force are re-distributed by predicting a nose dive phenomenon of the vehicle, whereby the occurrence of the nose dive phenomenon is prevented by minimizing damping control of an electronic control suspension (ECS). Thus, an excessive operation of the ECS may be prevented.