Vehicle dynamics control system

A vehicle dynamics control system for an automotive vehicle with a diagonal split layout of brake circuits, said system comprising:

• a first brake line connected to a first diagonally-opposed pair of wheel-brake cylinders;
• a second brake line connected to a second diagonally-opposed pair of wheel-brake cylinders;
• a first brake-fluid pressure generator for generating a first brake-fluid pressure which is variable depending on a magnitude of brake-pedal depression;
• a second brake-fluid pressure generator for generating a second brake-fluid pressure, independently of said first brake-fluid pressure based on the magnitude of brake-pedal depression;
• a first group of brake-fluid pressure selector valves for selecting a brake-fluid pressure to be fed to said first brake line from between said first and second brake-fluid pressures;
• a second group of brake-fluid pressure selector valves for selecting a brake-fluid pressure to be fed to said second brake line from between said first and second brake-fluid pressures;
• a first group of pressure control valves fluidly disposed in a first brake circuit including said first brake line for regulating a fluid pressure in each of said first diagonally-opposed pair of wheel-brake cylinders;
• a second group of pressure control valves fluidly disposed in a second brake circuit including said second brake line for regulating a fluid pressure in each of said second diagonally-opposed pair of wheel-brake cylinders;
• a vehicle-behavior detector for detecting a vehicle's cornering behavior;
• and
• a control unit being configured to be connected to said vehicle-behavior detector for controlling said first and second groups of brake-fluid pressure selector valves and said first and second groups of pressure control valves, in response to input information from said vehicle-behavior detector;
• wherein said control unit operates to supply said second brake-fluid pressure to an inner front wheel-brake cylinder of said first and second diagonally-opposed pairs of wheel-brake cylinders for increasing a fluid pressure in the inner front wheel-brake cylinder and operates to reduce a fluid pressure in an outer rear wheel-brake cylinder of said first and second diagonally-opposed pairs of wheel-brake cylinders to a predetermined minimum brake-fluid pressure level when said input information from said vehicle-behavior detector indicates a vehicle understeer during a turn, and said control unit operates to supply said second brake-fluid pressure to an outer front wheel-brake cylinder of said first and second diagonally-opposed pairs of wheel-brake cylinders for increasing a fluid pressure in the outer front wheel-brake cylinder and operates to reduce a fluid pressure in an inner rear wheel-brake cylinder of said first and second diagonally-opposed pairs of wheel-brake cylinders to a predetermined minimum brake-fluid pressure level when said input information from said vehicle-behavior detector indicates a vehicle oversteer during a turn.