Single Front Wheel Vehicle Rollover Prevention Control
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Solution Overview
Problem
Vehicles with a single front wheel and rear wheels arranged on either side are prone to rollover in a diagonally forward direction due to the unique wheel configuration, which existing control systems fail to effectively prevent.
Innovation Solution
A vehicle motion control system that assesses vehicle-body acceleration components in both longitudinal and lateral directions to determine when the vehicle is at high risk of rollover, then adjusts braking force and steering to limit the probability of rollover by controlling the motion of the vehicle, including limiting braking force and turning amounts, and potentially tilting the vehicle body to shift its center of gravity away from the rollover direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single front wheel and right/left rear wheels are used to reduce vehicle complexity, then device complexity is reduced, but rollover stability deteriorates due to the unique wheel configuration
Solution Approach 1:
The patent applies dynamic control by actively adjusting braking forces on individual wheels based on real-time vehicle state detection. The control system dynamically modifies braking distribution to counteract rollover tendencies, transforming a statically unstable wheel configuration into a dynamically stable system through continuous adaptation.
Solution Approach 2:
The system changes the parameter of braking force distribution across wheels based on detected vehicle acceleration and orientation. By varying braking force parameters in response to vehicle state, the system compensates for the inherent instability of the single front wheel configuration without modifying the physical wheel arrangement.
2Reliability
If existing rollover prevention control is used for conventional four-wheel vehicles, then rollover prevention is achieved for standard configurations, but it fails to prevent diagonally forward rollover in single front wheel vehicles
Solution Approach 1:
The patent applies local quality by implementing direction-specific rollover prevention. The control system identifies diagonally forward acceleration as a distinct hazard and applies targeted braking forces to specific wheels (particularly the front wheel and opposite rear wheel) to counteract this specific directional rollover tendency, rather than applying uniform prevention strategies.
Solution Approach 2:
The system segments the rollover prevention function into direction-specific control strategies. By detecting the direction of vehicle acceleration and applying differentiated braking forces to individual wheels based on their position relative to the rollover direction, the system creates specialized protection for the diagonally forward rollover mode that conventional unified systems cannot provide.
3Stability of the object's composition
If braking force is increased to prevent rollover, then rollover stability is improved, but vehicle controllability deteriorates due to excessive braking limitation
Solution Approach 1:
The system employs feedback by continuously monitoring vehicle acceleration, orientation, and wheel slip conditions, then adjusting braking forces in real-time based on this feedback. This closed-loop control prevents excessive braking limitation by only applying necessary braking force to counteract detected rollover tendencies, thereby maintaining vehicle controllability while improving rollover stability.
Solution Approach 2:
The patent applies partial action by selectively applying braking force only to specific wheels involved in the rollover risk, rather than uniformly limiting braking across all wheels. This targeted approach provides sufficient stabilization while preserving overall vehicle controllability and driver intent.
Data Source
AI summary
A vehicle motion control system for a vehicle having a single front wheel, a right wheel and a left wheel. The control system includes (a) a rollover-probability judging portion configured to judge whether or not a vehicle-body acceleration falls in a high rollover-probability region; and (b) a rollover-prevention control executing portion configured, when the acceleration falls in the high rollover-probability region, to execute a rollover prevention control for controlling motion of the vehicle so as to reduce the probability of rollover of the vehicle. The rollover-probability judging portion is configured to obtain a direction and a magnitude of the acceleration by composing a component of the acceleration in a longitudinal direction of the vehicle and a component of the vehicle-body acceleration in a width direction of the vehicle. The high rollover-probability region is defined by a threshold whose amount varies depending on the direction of the vehicle-body acceleration.