Abstract: The disclosure relates to a jackknifing controlling system, for reducing undesirable jackknifing in an articulated vehicle, particularly with a rear drive. Sensing means is provided for measuring the angle of steering as well as the angle of articulation. At all times, the actual angle of articulation is compared to an ideal angle of articulation for the particular angle of steering, the ideal angle having been preprogrammed into a memory device. Whenever the actual angle of articulation deviates from the preprogrammed ideal angle by a predetermined amount, control actions are initiated to control the articulation. Further articulation in the direction of deviation is immediately blocked. Articulation in the opposite direction, toward the ideal, is freely allowed if the deviation exceeds a predetermined amount. If it is less than the predetermined amount, articulation, even toward the ideal angle is, damped by throttling of hydraulic flows.

Abstract: An apparatus for an articulated vehicle for preventing jackknifing. A sensor for sensing the steered angle has a movable first element coupled to the steered wheel and a stationary second element, one of the first and second elements being divided into sections starting from the position of the steering to the left, with a discrete signal for each single section referring to its relative position and having a value differing from that of the other sections and a digital output signal characteristic of the serial number of each section.

Abstract: The invention relates to an anti-jackknifing device for an articulated motor vehicle, mainly for an articulated bus, where the torque influencing the jackknifing angle is brought about by a friction brake mechanism around the articulated coupling. The anti-jackknifing device has sensor elements sensing the run-dynamic characteristics connected to a control unit that controls the brake actuating unit of the brake mechanism. One of the elements of the friction brake mechanism braked in relation to each other is connected to one of the two or three vehicle units coupled to each other--i.e. front vehicle, trailer and intermediate vehicle unit--while the other element is connected to at least one of the further two vehicle units. One of the friction elements of the friction brake mechanism according to the invention is formed as brake rod connected to one of the vehicle units, the other friction element i.e.

Abstract: A anti-jackknifing device for a motor vehicle having two articulated units with a friction brake therebetween has a hydraulic control means for controlling the torque applied by the brake. A hydraulic sensor activating cylinder with two working spaces senses the jackknifing angle between the two units. A three-position four-way reversible valve is connected to the hydraulic brake activating cylinder, between a third port and a check valve and the valve in its first position connects its first and third ports and its second and fourth ports and in its second position connects its first and fourth ports and its second and third ports. A steering angle sensor is provided which determines the desired jackknifing angle therefor.

Abstract: In an anti-jackknifing apparatus for an articulated motor vehicle having a device filled with a pressure medium, the volume of which varies according to the magnitude of the jackknifing angle. The device has two movable opposite walls, each connected to one of the vehicle units. The device comprises an air spring connected to a working medium supply source.

Abstract: A jackknifing limiting device for articulated motor vehicles in which the vehicle has a front section and a rear section which are connected by a hinge therebetween, the device acting to limit the angle between the front and rear sections when the vehicle is turning, the device comprising a pair of hydraulic cylinders flanking the hinge and connected between the front and rear sections and a reservoir containing hydraulic fluid for the cylinders. Respective pressure regulating valves are connected between the reservoir and the cylinders and open unidirectionally toward the reservoir, with respective solenoid stop valves connected between the regulating valves and the reservoir, the stop valves being normally open. Respective check valves are provided in respective bypass lines connected between the reservoir and the cylinders, the check valves opening unidirectionally toward the cylinders.

Abstract: Equipment influencing the jacknifing angle of an articulated motor vehicle, when the vehicle units are in articulated coupling with each other, has a hydraulic piston device with two working spaces arranged outside the longitudinal centerline of the motor vehicle, the piston of which is connected to one unit, while its cylinder is connected to the other vehicle unit. Each working space is connected through a hydraulic valve unit to the hydraulic space of the hydropneumatic energy source, the valve unit has a parallel connected check valve and choke valve closing from the direction of the working space toward the hydropneumatic energy source. An adjustable transfer cross sectional closing element of the choke valve is in functional connection with the sensor element sensing the steering angle and direction of the front axle and the actuating signal of the sensor element is concomitant with the position of one of the choke valves bringing about increased choking.

Abstract: An antijackknifing apparatus for an articulated vehicle has an angle evaluating unit and an articulation locking mechanism including a locking activator unit. A control signal is produced corresponding to the sign of the deviation of the angle of articulation, the sign being positive when disposed to the right when viewed from above in the direction of movement and being negative when disposed to the left. The locking actuator unit also receives a direction signal which is positive when the change in the angle of articulation of the vehicle when view from above is clockwise and negative when counterclockwise. The locking activator unit goes into a locked condition when two opposite sign input signals are applied thereto.

Abstract: An articulated vehicle comprises a tractor which has a hydraulic steering gear, and a trailer connected to the tractor by a king-pin. The vehicle further includes anti-jack-knifing apparatus comprising two co-operating brake elements of a brake mechanism, one of which is secured to the tractor and the other to the trailer. The brake mechanism is actuated under the control of a hydraulic control unit responsive to the prevailing pressures in the steering gear, the arrangement being such that a predetermined, steady, anti-jack-knifing braking force is exerted by the braking mechanism when the steering gear is in its center position during rectilinear travel of the vehicle. When the steering is turned, a braking force smaller than the predetermined braking force is exerted.