System and method for operating a rollover control system in a transition to a rollover condition

Abstract

A method of operating a hydraulic safety system 38 includes determining a relative roll angle, determining a relative a slip angle, determining a yaw rate and determining a pressure build rate for the hydraulic safety system 38 in response to a relative roll angle, the yaw rate, slip angle, and yaw rate. The method further includes determining a precharge pressure level in response to the relative roll rate, the slip angle and the yaw rate and controlling the safety system 38 in response to the precharge pressure level.

What is claimed is:  
     
         1 . A system for controlling a safety system of an automotive vehicle comprising: 
 a first controller generating a first control signal;    a second controller generating a second control signal;    an arbitration module coupled to the first controller and the second controller, said arbitration module choosing the higher of the first control signal and the second control signal to a final control signal; and    the safety system coupled to the arbitration module, said safety system operated corresponding to the final control signal.    
     
     
         2 . A system as recited in  claim 1  wherein the first controller comprises a transition controller.  
     
     
         3 . A system as recited in  claim 1  wherein the second controller comprises a proportional-derivative controller.  
     
     
         4 . A system as recited in  claim 1  wherein the second controller comprises a proportional-integral derivative controller.  
     
     
         5 . A system as recited in  claim 1  wherein the second controller comprises a proportional-integral-derivative-double derivative controller.  
     
     
         6 . A system as recited in  claim 1  wherein the first signal and the second control signal comprise pressure signals.  
     
     
         7 . A system as recited in  claim 1  wherein the first signal and the second control signal comprise pressure request signals.  
     
     
         8 . A system as recited in  claim 1  wherein the safety system comprises a rollover control system.  
     
     
         9 . A system of operating a rollover control system of an automotive vehicle comprising: 
 a first controller generating a first pressure control signal;    a second controller generating a second pressure control signal;    an arbitration module coupled to the first controller and the second controller, said arbitration module choosing the higher of the first pressure control signal and the second pressure control signal to a final pressure control signal; and    the safety system coupled to the arbitration module, said safety system operated with the final pressure control signal.    
     
     
         10 . A system as recited in  claim 9  wherein the first controller comprises a transition controller.  
     
     
         11 . A system as recited in  claim 9  wherein the second controller comprises a proportional-derivative controller.  
     
     
         12 . A system as recited in  claim 9  wherein the second controller comprises a proportional-integral derivative controller.  
     
     
         13 . A system as recited in  claim 9  wherein the second controller comprises a proportional-integral-derivative-double derivative controller.  
     
     
         14 . A system as recited in  claim 9  wherein the first signal and the second control signal comprises pressure signals.  
     
     
         15 . A system as recited in  claim 9  wherein the first signal and the second control signal comprise pressure request signals.  
     
     
         16 . A system as recited in  claim 9  wherein the safety system comprises a rollover control system.  
     
     
         17 . A method of controlling a hydraulic safety system of an automotive vehicle comprising: 
 determining an angular vehicle position;    in a first controller generating a first control signal; and    when the angular position is greater than a threshold, generating a second control signal from a second controller.    
     
     
         18 . A method as recited in  claim 17  wherein the threshold corresponds substantially to a linear region and non-linear region.  
     
     
         19 . A method as recited in  claim 17  wherein the angular vehicle position comprises a roll angle.  
     
     
         20 . A method as recited in  claim 17  wherein the angular position corresponds to two-wheel lift.  
     
     
         21 . A method as recited in  claim 17  wherein angular position is inferred by a requested PID signal.  
     
     
         22 . A method of operating a safety system in an automotive vehicle comprising: 
 in a non-divergent region of dynamics of the vehicle, operating the safety system with a transition controller; and    in a divergent region of dynamics of the vehicle, operating the safety system with a proportional-derivative controller.    
     
     
         23 . A method as recited in  claim 22  wherein the proportional-derivative controller comprises a PID controller.