Vehicle suspension system

A vehicle suspension system comprising a first damper and a second damper, said first damper and said second damper being interrelated, said first damper comprising a first piston and a first cylinder body, a first cylinder bore being defined by said first cylinder body, said first piston arranged to reciprocate within said first cylinder bore, said first piston having a first effective area a1, said first damper extending between a first wheel and a vehicle body, said second damper comprising a second piston and a second cylinder body, a second cylinder bore being defined by said second cylinder body, said second piston being arranged to reciprocate within said second cylinder bore, said second piston having a second effective area a2, said second damper extending between a second wheel and said vehicle body, a first chamber being defined within said first cylinder body at least in part by said first piston, a second chamber being defined within said second cylinder body at least in part by said second piston, a first pressure regulating cylinder being in fluid communication with said first chamber and a second pressure regulating cylinder being in fluid communication with said second chamber, said first pressure regulating cylinder comprising a first variable volume chamber and said second pressure regulating cylinder comprising a second variable volume chamber, said first variable volume chamber and said second variable volume chamber being defined at least in pan by a single moveable member, said single moveable member having a first subarea A1 that corresponds to said first variable volume chamber and a second subarea A2 that corresponds to said second variable volume chamber, a bypass passage extending between said first variable volume chamber and said second variable volume chamber and a first throttle valve and a second throttle valve being positioned within said bypass passage, said suspension system being configured such that ( S 1 λ 1 ) × ( a 1 A 1 ) × Δ ⁢ ⁢ φ = - ( S 2 λ 2 ) × ( a 2 A 2 ) × Δ ⁢ ⁢ φ ′ ,

• wherein S1 and S2 are a piston travel of said first piston and said second piston respectively, λ1 and λ2 are the travel of said first wheel and said second wheel respectively and Δφ and Δφ′ are a first differential pressure when a working fluid flows from said first variable volume chamber to said second variable volume chamber and a second differential pressure when said working fluid flows from said second variable volume chamber to said first variable volume chamber, and wherein at least one of the blowing conditions is satisfied when said first wheel and said second wheel are moving in opposite directions at approximately a single absolute value of speed:
• a1 is not the same as a2, S1/λ1 is not the same as S2/λ2, or a first damping characteristic associated with flow of said working fluid from said first variable volume chamber to said second variable volume chamber is not the same as a second damping characteristic associated with flow of said working fluid from said second variable volume chamber to said first variable volume chamber.

An vehicle suspension system comprising a first damper and a second damper, said first damper and said second damper being interrelated, said first damper comprising a first piston and a body, a first cylinder bore being defined by said first cylinder body, said first piston arranged to reciprocate within said first cylinder bore, said first piston having a first effective area a1, said first damper extending between a first wheel and a vehicle body, said second damper comprising a second piston and a second cylinder body, a second cylinder bore being defined by said second cylinder body, said second piston being arranged to reciprocate within said second cylinder bore, said second piston having a second effective area a2, said second damper extending between a second wheel and said vehicle body, a first chamber being defined within said first cylinder body at least in part by said first piston, a second chamber being defined within said second cylinder body at least in part by said second piston, a first pressure regulating cylinder being in fluid communication with said first chamber and a second pressure regulating cylinder being in fluid communication with said second chamber, said first pressure regulating cylinder comprising a first variable volume chamber and said second pressure regulating cylinder comprising a second variable volume chamber, said first variable volume chamber and said second variable volume chamber being defined at least in part by a single moveable member, said single movable member having a first subarea A1 that corresponds to said first variable volume chamber and a second subarea A2 that corresponds to said second variable volume chamber, a bypass passage extending between said first variable volume chamber and said second variable volume chamber and a first throttle valve and a second throttle valve being positioned within said bypass passage, said suspension system being configured such that ( S 1 λ 1 ) × ( a 1 A 1 ) × Δ ⁢ ⁢ Φ W 1 = - ( S 2 λ 2 ) × ( a 2 A 2 ) × Δ ⁢ ⁢ Φ ′ W 2 ,

• wherein Sand S2 are a piston travel of said first piston and said second piston respectively, λ1 and λ2 are the travel of said first wheel and said second wheel respectively, Δφ and Δφ′ are a first differential pressure when a working fluid flows from said first variable volume chamber to said second variable volume chamber and a second differential pressure when said working fluid flows from said second variable volume chamber to said first variable volume chamber respectively and W1 and W2 are a first static ground contact load at a contact surface between said first wheel and a reference plane and a second static ground contact load at a contact surface between said second wheel and said reference plane, and wherein at least one of the following conditions is satisfied when said first wheel and said second wheel are moving in opposite directions at approximately a single absolute value of speed:
• a1 is not the same as a2, W1 is not the same as W2, S1/λ1 is not the same as S2/λ2, or a first damping characteristic associated with flow of said working fluid from said first variable voluble chamber to said second variable volume chamber is not the same as a second damping characteristic associated with flow of said working fluid from said second variable volume chamber to said first variable volume chamber.

A vehicle suspension system comprising a first damper and a second damper, said first damper and said second damper being interrelated, said first damper comprising a first piston and a first cylinder body, a first cylinder bore being defined by said first cylinder body, said first piston arranged to reciprocate within said first cylinder bore, said first damper extending between a first wheel and a vehicle body, said second damper comprising a second piston and a second cylinder body, a second cylinder bore being defined by said second cylinder body, said second piston being arranged to reciprocate within said second cylinder bore, said second damper extending between a second wheel and said vehicle body, a first chamber being defined within said first cylinder body at least in part by said first piston, a second chamber being defined within said second cylinder body at least in part by said second piston, a first pressure regulating cylinder being in fluid communication with said first chamber and a second pressure regulating cylinder being in fluid communication with said second chamber, said first pressure regulating cylinder comprising a first variable volume chamber and said second pressure regulating cylinder comprising a second variable volume chamber, said first variable volume chamber and said second variable volume chamber being defined at least in part by a single moveable member, a bypass passage extending between said first variable volume chamber and said second variable volume chamber and a first throttle valve and a second throttle valve being positioned within said bypass passage and means for substantially stopping flow through said bypass passage when said first wheel and said second wheel move relative to said vehicle body.