Automatic modulation of electronic braking air pressure as a function of load applied to vehicle's mechanical suspension, air control valve operates a pivoting lever linked to chassis and wheel

摘要

A control valve (4) is carried on the vehicle's chassis. A link (10) connects the valve actuator (8) to the vehicle's wheel (1). The valve actuator consists of a pivoting lever whose free end is hinged to a rod fixed on the wheel (1). Alternatively the actuator consists of a linear displaceable part such as a pushrod or a cam. An adjuster modifies the relation between angular displacement of the lever and air pressure values delivered by the valve. The device ensures automatic modulation of a vehicles air braking pressure as a function of load applied to vehicle. The vehicle has a mechanical suspension fitted between its chassis (2) and wheel (1) and an electronic braking system. It includes an air pressure control valve (4) connected to a pressurized air source (6). The valve has a movable part (8) controlled by the relative variation in distance between two pats of the chassis and the wheel. The valve is supported on one of the two parts (1,2) and a link (10) connects the movable part (8) to the other of the two parts. A variation in relative distance between the chassis and the wheel due to load automatically gives a corresponding displacement to the part (8) and therefore a corresponding variation of braking air pressure delivered by the valve (4).