Vehicle Braking Control Device for Stability and Wear Reduction
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Solution Overview
Problem
Existing vehicle control systems lack an efficient method to control acceleration and deceleration using a single operating pedal while effectively managing multiple types of brakes, leading to suboptimal steering stability and brake wear.
Innovation Solution
A running control device that adjusts the distribution of engine braking, regenerative braking, and friction braking based on the vehicle's behavior state, using sensors to determine stability and adjust the braking force distribution between wheels to enhance steering stability and reduce brake wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If friction braking is used for deceleration control, then deceleration performance is improved, but brake wear increases
Solution Approach 1:
The system dynamically changes the distribution parameters of braking force among engine braking, regenerative braking, and friction braking based on vehicle behavior state. When the vehicle is in a stable state, it increases the proportion of engine braking and regenerative braking while reducing friction braking, thereby maintaining deceleration performance while reducing brake wear.
2Use of energy by moving object
If engine braking and regenerative braking are increased, then fuel efficiency is improved, but vehicle stability may deteriorate in unstable states
Solution Approach 1:
The system continuously monitors vehicle behavior state through sensors and feedback control. When the vehicle behavior is determined to be unstable or likely to become unstable, the control device reduces the distribution of engine braking and regenerative braking while increasing friction braking, thereby maintaining vehicle stability. This feedback mechanism allows the system to switch between fuel-efficient mode and stability-priority mode as needed.
3Ease of operation
If a single operating pedal is used for both acceleration and deceleration, then ease of operation is improved, but control complexity increases
Solution Approach 1:
The control device integrates multiple functions into a single operating pedal system. The same pedal is used for both acceleration and deceleration operations, and the control device automatically determines the appropriate braking method (engine braking, regenerative braking, or friction braking) based on the pedal operation amount and vehicle state, thereby simplifying driver operation while managing control complexity through automated decision-making.
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 system improves steering stability, reduces brake wear, and enhances fuel efficiency by dynamically adjusting braking force distribution, ensuring stable vehicle behavior and comfort during various driving conditions.
Implementation Method 1
regenerative braking generated by an electric motor
Implementation Method 2
friction braking generated by friction due to contact with wheels
Implementation Method 3
engine braking generated by an internal-combustion engine
Data Source
AI summary
A running control device changes the distribution of engine braking or regenerative braking and the distribution of friction braking in the entire requested braking force according to an operation amount of an operation element, according to whether the behavior of a vehicle during running is in a stable state or an unstable state, or becomes an unstable state in the near future with high probability.