Alternating Braking Force Control for Vehicle Deceleration
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Solution Overview
Problem
Existing braking force control technologies fail to adequately exhibit the braking capabilities of wheels due to restricted road surface reaction forces caused by fluctuations in braking forces across wheels.
Innovation Solution
A braking force control device that suppresses the increase of braking force in wheels with a relatively large slip amount while increasing the braking force of wheels with a relatively small slip amount, ensuring the braking force of the latter exceeds that of the former, thereby optimizing wheel braking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the braking force of each wheel is independently controlled to prevent wheel lock, then wheel lock is avoided, but the braking capability cannot be sufficiently exhibited due to restricted road surface reaction force
Solution Approach 1:
The patent merges the control of braking forces between right and left wheels by making them operate in an alternating sequence. When one wheel's braking force is increased, the other wheel's braking force is suppressed, and vice versa. This coordinated control allows both wheels to alternately reach peak friction coefficients, maximizing the utilization of road surface reaction force while maintaining wheel lock prevention.
2Productivity
If the braking force is increased to improve deceleration performance, then deceleration performance is improved, but the road surface reaction force is restricted due to fluctuation in braking forces across wheels
Solution Approach 1:
The patent implements periodic action by alternately increasing and suppressing braking forces on right and left wheels in a cyclic manner. Each wheel experiences periods of braking force increase followed by suppression, allowing the friction coefficient to repeatedly reach peak values. This periodic alternation ensures continuous utilization of maximum road surface reaction force, improving overall deceleration performance without restricting the available force.
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 allows for improved vehicle deceleration by ensuring that the braking force of each wheel is aligned with the maximum road surface reaction force, enhancing braking performance and stability.
Implementation Method 1
a braking force control device capable of appropriately exhibiting the braking capabilities of wheels
Data Source
AI summary
A braking force control device can control braking forces of the respective wheels of a vehicle, suppresses an increase of the braking force of a first wheel that is a wheel having a relatively large slip amount in a pair of right/left wheels and increases the braking force of a second wheel that is a wheel having a relatively small slip amount. The braking force control device may suppress the increase of the braking force of the first wheel before the friction coefficient of a road surface to the first wheel reaches a peak and when the friction coefficient is in the vicinity of the peak. It is preferable to suppress the increase of the braking force of the first wheel by holding the braking force of the first wheel.