Brake Force Distribution for Low-Speed Tight Turning
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Solution Overview
Problem
Long-wheelbase vehicles face challenges in improving their turning performance during low-speed maneuvers, such as parking in narrow spaces, due to their inherent characteristics.
Innovation Solution
A brake force distribution device that includes a turning state detection, vehicle speed detection, and yaw moment calculations to control brake force distribution, allowing vehicles to simulate a shorter wheelbase operation by adjusting brake forces based on steering angles and obstacle detection to enhance turning performance and avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake force distribution is controlled based on the inherent wheelbase of a long-wheelbase vehicle, then the vehicle maintains stable braking performance, but the turning performance at low speeds deteriorates due to the long wheelbase characteristics
Solution Approach 1:
The system dynamically switches between two wheelbase parameters (first wheelbase and second wheelbase) based on vehicle speed and steering angle conditions. At low speeds with large steering angles, it uses the first wheelbase (shorter imaginary value) to improve turning performance. At higher speeds or normal conditions, it uses the second wheelbase (inherent value) to maintain stable braking performance. This dynamic parameter switching resolves the contradiction between turning performance and braking stability.
Solution Approach 2:
The invention changes the wheelbase parameter value based on operating conditions. By calculating and switching between different wheelbase values (first wheelbase vs. second wheelbase), the system adapts the vehicle's braking characteristics to match the desired turning behavior at low speeds while maintaining inherent stability during normal operation. This parameter change allows the long-wheelbase vehicle to simulate short-wheelbase turning characteristics when needed.
2Device complexity
If the vehicle operates with its inherent long wheelbase characteristics, then the vehicle structure is simple and stable, but the turning radius at low speeds is large making it difficult to park in narrow spaces
Solution Approach 1:
The system dynamically adjusts the effective wheelbase parameter based on driving conditions without physically modifying the vehicle structure. By switching between the first wheelbase (for turning) and second wheelbase (for stable operation) based on speed and steering angle thresholds, the long-wheelbase vehicle can achieve tight turning radii comparable to short-wheelbase vehicles during low-speed maneuvers while maintaining its original simple structure.
Solution Approach 2:
The invention creates a virtual/imaginary first wheelbase that copies the turning characteristics of a short-wheelbase vehicle. By calculating brake force distribution based on this imaginary shorter wheelbase parameter during low-speed turning conditions, the long-wheelbase vehicle can replicate the agile turning behavior of shorter vehicles without actually changing its physical dimensions or structure.
3Device complexity
If brake force is uniformly distributed to all wheels, then the control system is simple, but the vehicle cannot achieve differential braking needed for tight turning maneuvers
Solution Approach 1:
The control system dynamically adjusts brake force distribution based on detected vehicle conditions (speed and steering angle). When low-speed turning conditions are detected, the system calculates differential brake forces for left and right wheels based on the first wheelbase parameter, enabling tight turning maneuvers. During normal conditions, it uses uniform distribution based on the second wheelbase, maintaining simple control. This dynamic adaptation resolves the contradiction between control simplicity and turning maneuverability.
Solution Approach 2:
The system changes the brake force distribution parameters (from uniform to differential) based on operating conditions. By switching between uniform brake distribution (simple control) and differential brake distribution (for tight turning) based on speed and steering angle thresholds, the system achieves both simplicity and maneuverability at different times without requiring complex continuous control logic.
Data Source
AI summary
Disclosed are a brake force distribution device for vehicle and method thereof. The brake force distribution device for vehicle includes: a turning state detection part detecting whether the vehicle is in a turning state based on the driving state of the vehicle; a vehicle speed detection part detecting whether the vehicle speed is equal to or less than a prescribed threshold; a first yaw moment calculation part calculating the first yaw moment based on the driving state of the vehicle, the vehicle speed and the first wheelbase; a second yaw moment calculation part calculating the second yaw moment based on the driving state and the vehicle speed as well as based on the second wheelbase which is the inherent value of the vehicle; and a target moment calculation part calculating a target moment based on the difference between the first yaw moment and the second yaw moment.