Vehicle Brake Control Using Risk-Based Friction Regen Split
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Solution Overview
Problem
Existing vehicle brake control systems face challenges in achieving immediate and appropriate braking force, particularly during emergency evasion or when regenerative braking is insufficient, leading to suboptimal deceleration and maneuverability.
Innovation Solution
An operation control system that determines control values for friction and regenerative braking forces based on risk potential, adjusting the distribution ratio between the two forces to ensure effective deceleration, using a risk-potential determining unit, control value determining unit, and braking force determining units to apply braking forces to multiple wheels, thereby enhancing emergency evasion performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking force is maximized to improve energy recovery, then energy efficiency is improved, but immediate and appropriate deceleration cannot be achieved when risk potential is high
Solution Approach 1:
The patent applies dynamics by making the braking force distribution adjustable based on operating conditions. The control value determining unit dynamically changes the distribution ratio between regenerative and friction braking forces according to the risk potential determined by the risk-potential determining unit. This allows the system to switch from energy-recovery-oriented distribution under normal conditions to deceleration-oriented distribution under high-risk conditions, resolving the contradiction between energy efficiency and immediate deceleration capability.
2Speed
If friction braking force is increased to improve deceleration response, then deceleration performance is improved, but energy recovery is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the distribution ratio parameter between regenerative and friction braking forces based on the risk potential level. Under normal conditions, the distribution ratio favors regenerative braking for energy recovery. When risk potential exceeds a threshold, the distribution ratio is changed to favor friction braking for immediate deceleration response. This dynamic parameter adjustment resolves the contradiction between deceleration performance and energy recovery.
3Loss of energy
If regenerative braking is used exclusively to maximize energy collection, then energy efficiency is improved, but appropriate braking force is not immediately obtained in emergency situations
Solution Approach 1:
The patent applies preliminary action by having the risk-potential determining unit continuously assess the surrounding environment and vehicle state before an emergency occurs. When risk potential exceeds the threshold, the control value determining unit proactively adjusts the braking force distribution to prioritize friction braking, ensuring that the appropriate braking force is immediately available when needed, rather than waiting for the emergency to occur and then switching systems.
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 enables immediate and appropriate deceleration by prioritizing friction braking during high-risk situations, improving emergency evasion performance and reducing the reliance on regenerative braking, which can be limited at high speeds.
Implementation Method 1
a friction braking device that gives a friction braking force to the vehicle
Implementation Method 2
a regenerative braking device that gives a regenerative braking force to the vehicle
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
The present invention improves emergency evasion performance. An operation control system for a vehicle that is provided with a risk-potential determining unit that determines the risk potential of a vehicle on the basis of external environment information and/or vehicle information, a friction braking unit that applies friction braking force to the vehicle, and a regenerative braking device that applies regenerative braking force to the vehicle, the operation control system being provided with a control value determining unit that determines a first control value that is for determining the size of the friction braking force and determines a second control value that is for determining the size of the regenerative braking force. The control value determining unit determines at least the first control value on the basis of the risk potential determined by the risk-potential determining unit.