Integrated Stability Control System for Yaw Roll Lateral Motion
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Solution Overview
Problem
Current vehicle stability control systems struggle to accurately integrate yaw, roll, and lateral stability control functions, leading to potential cancellation of control actions and inadequate performance in unstable vehicle dynamics, especially on complex road conditions and aggressive driving scenarios.
Innovation Solution
An integrated sensing system (ISS) that combines a six-degree of freedom inertial measurement unit (IMU), steering wheel angle sensor, ABS wheel speed sensors, and other sensors to provide comprehensive data for an integrated stability control system (ISCS), enabling coordinated control of yaw, roll, and lateral stability through advanced algorithms and sensor signal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate stability control systems (YSC, RSC) are used, then individual control functions can be implemented, but control actions may cancel each other out and coordination becomes difficult
Solution Approach 1:
The patent merges separate yaw stability control (YSC) and roll stability control (RSC) systems into a single integrated stability control system. The integrated sensing system combines multiple sensors (gyro, accelerometer, steering angle sensor, wheel speed sensor) into one coordinated system that simultaneously measures vehicle dynamics parameters, enabling unified control of yaw and roll stability without the cancellation problems of separate systems.
Solution Approach 2:
The integrated stability control system performs multiple functions through a single control architecture. It simultaneously provides yaw stability control, roll stability control, and lateral stability control by processing integrated sensor data through unified control algorithms, making the system versatile while reducing coordination complexity between separate systems.
2Measurement precision
If advanced sensors (gyro, accelerometer) are used, then superior vehicle dynamics information can be obtained, but system cost and complexity increase
Solution Approach 1:
The patent combines multiple sensing functions into an integrated sensing system where gyro sensors, accelerometers, steering angle sensors, and wheel speed sensors work together as a unified system. This merging reduces overall system complexity compared to separate sensing systems while achieving superior measurement precision for vehicle dynamics parameters through the synergistic use of multiple sensor types.
Solution Approach 2:
The integrated sensing system serves multiple measurement functions simultaneously - it provides yaw rate, roll rate, lateral acceleration, steering angle, and wheel speed information through a single coordinated sensing architecture. This multi-functionality reduces the need for separate sensing systems while maintaining high measurement precision for all vehicle dynamics parameters.
3Reliability
If integrated stability control is implemented, then coupled unstable vehicle dynamics can be stabilized, but accurate discrimination of different unstable dynamics is required
Solution Approach 1:
The integrated stability control system combines yaw stability control, roll stability control, and lateral stability control into a unified control framework. By integrating the control functions and using coordinated sensor data, the system can accurately distinguish between different types of unstable dynamics (yaw instability, roll instability, lateral instability) and apply appropriate control actions, improving reliability while managing the complexity of detecting and measuring various unstable conditions.
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 ISS enhances vehicle stability control by accurately differentiating between driver-induced and road-induced dynamics, improving control performance on various road surfaces and reducing false control actions, thereby enhancing safety and handling.
Implementation Method 1
an inertial measurement unit (IMU) which includes a yaw rate sensor, a pitch rate sensor, a roll rate sensor, a lateral acceleration sensor and a vertical acceleration sensor
Implementation Method 2
gyro sensors, previously only used in aircraft and spacecraft, have now been incorporated in various vehicle dynamics controls
Data Source
AI summary
An integrated stability control system using the signals from an integrated sensing system for an automotive vehicle includes a plurality of sensors sensing the dynamic conditions of the vehicle. The sensors include an IMU sensor cluster, a steering angle sensor, wheel speed sensors, any other sensors required by subsystem controls. The signals used in the integrated stability controls include the sensor signals; the roll and pitch attitudes of the vehicle body with respect to the average road surface; the road surface mu estimation; the desired sideslip angle and desired yaw rate from a four-wheel reference vehicle model; the actual vehicle body sideslip angle projected on the moving road plane; and the global attitudes. The demand yaw moment used to counteract the undesired vehicle lateral motions (under-steer or over-steer or excessive side sliding motion) are computed from the above-mentioned variables. The braking control is a slip control whose target slip ratios at selective wheels or wheel are directly generated from the request brake pressures computed from the demand yaw moment.