Rollover control method and system thereof
First Claim
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1. A rollover control method, the method comprising the steps of:
- detecting a steering angle, a wheel Revolutions Per Minute (RPM), a roll angle, a roll rate, a yaw rate and a vehicle speed detected according to the change of the operation state of a vehicle;
processing said steering angle and said wheel RPM thus detected by a vehicle dynamical equation, thereby calculating a longitudinal velocity, a lateral velocity, a yaw rate, a roll rate, a roll angle, a slip angle, and a slip ratio;
predicting a slip angle transiently generated while said yaw rate, said roll rate, said roll angle, and said vehicle speed thus detected and the values calculated using said vehicle dynamical equation are processed by a filter;
calculating a tire lateral force based on said slip angle thus predicted;
performing a pre-rollover decision subroutine that estimates the possibility of generating a rollover based on said tire lateral force thus computed;
predicting a lateral velocity using the filter when there is a possibility of a generation of a rollover at said pre-rollover decision subroutine; and
performing a rollover decision subroutine that assesses the rollover based on said lateral velocity thus predicted.
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Abstract
A rollover control method and a system thereof for accurately predicting the occurrence of a rollover and protecting passengers therefrom.
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Citations
9 Claims
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1. A rollover control method, the method comprising the steps of:
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detecting a steering angle, a wheel Revolutions Per Minute (RPM), a roll angle, a roll rate, a yaw rate and a vehicle speed detected according to the change of the operation state of a vehicle; processing said steering angle and said wheel RPM thus detected by a vehicle dynamical equation, thereby calculating a longitudinal velocity, a lateral velocity, a yaw rate, a roll rate, a roll angle, a slip angle, and a slip ratio; predicting a slip angle transiently generated while said yaw rate, said roll rate, said roll angle, and said vehicle speed thus detected and the values calculated using said vehicle dynamical equation are processed by a filter; calculating a tire lateral force based on said slip angle thus predicted; performing a pre-rollover decision subroutine that estimates the possibility of generating a rollover based on said tire lateral force thus computed; predicting a lateral velocity using the filter when there is a possibility of a generation of a rollover at said pre-rollover decision subroutine; and performing a rollover decision subroutine that assesses the rollover based on said lateral velocity thus predicted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A rollover control system comprising:
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a vehicle operation state detecting module for detecting a steering angle, a wheel Revolutions Per Minute (RPM), a yaw rate, a roll rate, a roll angle and a vehicle speed angle that vary in relation to changes in the running state of the vehicle; a vehicle dynamics processing module for calculating a longitudinal velocity, a lateral velocity, a yaw rate, a roll rate, said roll angle, a slip angle and a slip ratio by a vehicle dynamical equation preset in a program after receiving said steering angle and said wheel RPM detected from said vehicle operation state detecting module; a filter module for predicting a slip angle and a lateral velocity after a predetermined time by using the values calculated from said vehicle dynamics processing module and said yaw rate, said roll rate, said roll angle and said vehicle speed detected by said vehicle operation state detecting part; a tire dynamics processing module for calculating a tire lateral force based on said slip angle value predicted at said applied filter module; a pre-rollover decision module for deterring the rollover when its generation is predicted based on said lateral force produced from said tire dynamics processing module; and a rollover decision module for performing a protective action for the passengers when the overturn is decided, based on said lateral velocity generated from said filter module after the rollover generation control action is performed by said pre-rollover decision module.
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Specification