Reaction Wheel Yaw Control for Low-Friction Vehicles
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Solution Overview
Problem
Existing yaw stability control systems for vehicles are less effective on wet or icy road conditions, as the performance of brakes can be adversely affected, leading to difficulties in maintaining vehicle direction intended by the driver, especially at low speeds.
Innovation Solution
A yaw stability control system that includes cameras for detecting lane markings, wheel speed sensors, a yaw angle sensor, a steering angle sensor, and a reaction wheel with an electric motor, which works in conjunction with a processor to determine a desired yaw angle and generate an actuation signal to rotate the reaction wheel, producing a counter-acting torque to redirect the vehicle back to the intended direction by compensating for momentum imparted by different road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If brake force is applied to one or more wheels to adjust yaw angle, then vehicle direction control is improved, but system effectiveness deteriorates on wet or icy road conditions
Solution Approach 1:
The patent replaces the mechanical brake system with an electromagnetic reaction wheel system. The reaction wheel, mounted to rotate within a horizontal plane and coupled to an electric motor, generates electromagnetic torque to counteract unwanted yaw motion. This substitution eliminates dependence on road friction, allowing the system to effectively control vehicle direction on wet or icy surfaces where brake-based systems fail.
2Stability of the object's composition
If brake force is selectively applied to control yaw, then vehicle stability is improved, but performance deteriorates at low speeds on black ice
Solution Approach 1:
The reaction wheel system replaces friction-dependent brake mechanisms with an electromagnetic torque generation system. The electric motor drives the reaction wheel to produce counter-torque that stabilizes vehicle yaw angle, independent of road surface friction conditions and vehicle speed, thereby maintaining stability control effectiveness on black ice at low speeds.
Solution Approach 2:
The system continuously monitors yaw angle through sensors and applies periodic corrective torque through the reaction wheel. The control system processes sensor data and generates actuation signals at regular intervals to maintain desired yaw angle, providing continuous stability adjustment rather than relying on intermittent brake application.
3Reliability
If reaction wheel is added to the system, then vehicle direction control on low-friction surfaces is improved, but device complexity increases
Solution Approach 1:
The reaction wheel system serves multiple functions: it generates counter-torque for yaw control, provides stability enhancement, and operates across all road conditions and speed ranges. This multi-functionality justifies the added complexity by consolidating various control needs into a single unified system that replaces multiple brake-based control mechanisms.
Solution Approach 2:
The reaction wheel acts as an intermediary between the electric motor and the vehicle's yaw motion. Rather than directly applying force to the wheels or chassis, the system uses the rotating reaction wheel to generate electromagnetic torque that indirectly influences vehicle direction, providing smooth and precise control while isolating the control system from direct mechanical interactions.
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 effectively compensates for road conditions that cause vehicles to steer off course, ensuring the vehicle follows the driver's intended path even on low-friction surfaces like black ice, by generating a counter-acting torque using a reaction wheel and electric motor, thereby improving vehicle stability and direction control.
Implementation Method 1
The reaction wheel is adapted to mount to the motor vehicle for angularly rotating within a horizontal plane... The electric motor angularly rotates the reaction wheel... to produce a counter-acting torque that rotates the motor vehicle to the desired yaw angle
Implementation Method 2
an electric motor connected to the reaction wheel for angularly rotating the reaction wheel
Implementation Method 3
a reaction wheel, which has a moment of inertia and is adapted to mount to the motor vehicle for angularly rotating within a horizontal plane
Data Source
AI summary
A yaw stability control system is provided for a motor vehicle. The system includes one or more cameras, a plurality of wheel speed sensors, a yaw angle sensor, and a steering angle sensor. The system further includes an electric motor connected to a reaction wheel. The system further includes a processor and a memory including instructions such that the processor is programmed to: determine a desired yaw angle of the motor vehicle based on a video signal, speed signals, a yaw signal, and a steering signal. The processor is further programmed to generate an actuation signal associated with the desired yaw angle. The electric motor angularly rotates the reaction wheel at a predetermined angular rate in a predetermined rotational direction to produce a counter-acting torque that rotates the motor vehicle to the desired yaw angle, in response to the electric motor receiving the actuation signal from the processor.