Wheel Motor Torque Control for Vehicle Roll Stability
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Solution Overview
Problem
Vehicles experience undesirable roll moments during sharp steering or collisions, leading to instability, wheel lift, or rollover due to insufficient roll stability under certain driving conditions.
Innovation Solution
The technology adjusts motor torque independently to wheels based on sensor data, activating a roll stability mode by increasing torque to one wheel and reducing it to another, creating a yaw counter moment that reduces lateral acceleration and enhances roll stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If motor torque is adjusted independently to wheels to create yaw counter moment, then roll stability is improved, but vehicle control complexity increases
Solution Approach 1:
The patent divides the vehicle's wheel torque control into independent controllable units, allowing each wheel to receive individually adjusted motor torque. This segmentation enables the creation of yaw counter moments by adjusting torque on specific wheels, directly improving roll stability while managing control complexity through modular torque distribution.
Solution Approach 2:
The system dynamically adjusts motor torque to wheels based on real-time sensor data and detected vehicle states. The controller continuously monitors lateral acceleration, yaw rate, and other parameters, then adaptively modifies torque distribution to create appropriate yaw counter moments, enabling the vehicle to respond dynamically to changing stability conditions.
2Measurement precision
If sensor data is continuously monitored to detect vehicle state, then roll stability control accuracy is improved, but energy consumption increases
Solution Approach 1:
The system continuously monitors sensor data and detects vehicle states in advance before critical instability occurs. By performing preliminary detection of roll stability conditions, the controller can proactively adjust motor torque to prevent wheel lift or rollover, improving control accuracy while managing energy use through early intervention rather than reactive correction.
Solution Approach 2:
The patent implements a feedback control system where sensor data from accelerometers, gyroscopes, and other sensors continuously feeds back to the controller. The controller processes this feedback to detect vehicle states and adjusts motor torque accordingly, creating a closed-loop system that improves detection accuracy and stability control while optimizing energy consumption through intelligent feedback processing.
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 effectively mitigates the risk of wheel lift and rollover by reducing yaw moment and improving roll stability through controlled motor torque adjustments, applicable to various vehicle configurations with individually controllable motors.
Implementation Method 1
motor torque provided to a wheel of the vehicle is adjusted independently of motor torque provided to other wheels of the vehicle
Implementation Method 2
The motor torque adjustment creates a yaw counter moment that reduces a yaw moment on the vehicle, which in turn reduces a lateral acceleration of the vehicle and provides roll stability for the vehicle
Data Source
AI summary
Roll stability for a vehicle is provided using motor torque adjustments to wheels of the vehicle. When a vehicle state indicative of an undesirable roll stability level is detected, a roll stability mode is activated. In response to activating the roll stability mode, motor torque to at least one wheel of the vehicle is adjusted independently of motor torque to other wheels of the vehicle.