Abstract:
A brake controller determines if an amount of regenerative braking needed to achieve a requested deceleration will exceed a driveline capability of a tractor. If it will, the brake controller redistributes some of the requested deceleration to a braking system of a trailer. That way, the requested deceleration can be achieved by the combination of regenerative braking of the tractor and the braking system of the trailer. Other braking mechanism(s) of the tractor can also be used, if needed.
Abstract:
An electropneumatic control module for an electronically controllable pneumatic brake system for a vehicle combination with a tractor vehicle and a trailer vehicle includes a pneumatic reservoir input, which is connectable to a compressed-air reservoir, and a trailer control unit, which has a trailer control valve unit with one or more electropneumatic valves, a trailer brake pressure port and a trailer supply pressure port. The electropneumatic control module further includes an immobilizing brake unit, which has a spring-type actuator port for at least one spring-type actuator for a tractor vehicle and an immobilizing brake valve unit with one or more electropneumatic valves, and an electronic control unit, wherein the electronic control unit is designed to, based on an electronic immobilizing signal, trigger the immobilizing brake valve unit to switch at least one valve of the immobilizing brake valve unit.
Abstract:
Anti-lock system for the air brakes of wheeled vehicles to be interposed between the existing relay valves and air-actuated diaphragms for applying the brakes and to be actuatable alternately in a pulsing sequence by a pulse-generating circuit after a predetermined electrical time delay sufficient to allow full frictional brake engagement upon actuation by the operator of the air brakes so as to block air flow from the relay valves to the air-actuated diaphragms and to vent air from the air-actuated diaphragms, thereby causing momentary release of the brakes, and then to re-establish air flow from the relay valves to the air-actuated diaphragms and to block venting of air from the air-actuated diaphragms, thereby causing a re-application of the brakes; and a solenoid-controlled valve for the anti-lock system having passageways of critical length and diameter.
Abstract:
An electronic antiskid brake control system for effecting adjustment of brake pressure on the individual wheels of a common axle of a vehicle independent of the operator controlled brake pressure in such a manner that when a predetermined brake pressure difference arises between the respective wheels, due to the skidding of one wheel, the higher wheel brake pressure is adjusted so as to prevent the brake pressure difference from exceeding the predetermined difference. In one embodiment, a control piston subject to the different wheel brake pressures operates a switch armature between a pair of electrical contacts via which one or the other of modulating valves in the respective wheel brake lines is energized when the predetermined brake pressure difference arises. In a second embodiment, a pressure limiting valve subject to the different wheel brake pressures is connected in each brake line between the modulating valve and brake cylinder to adjust the brake pressure of that wheel when the other wheel brake pressure is greater by the predetermined brake pressure difference. Until this predetermined brake pressure difference develops, the non-skidding wheel in each of the above embodiments produces normal braking to obtain good stop distances, while steering stability is maintained by limiting the brake pressure difference in excess of that which is considered unsafe.
Abstract:
An hydraulic anti-skid braking system for vehicles, having two different modes of operation depending on the braking pressure required to cause the wheels to slip or for wheel locking to become imminent. If the surface is slippery the braking pressure required to cause sliding is not high and a rapid, substantially complete release of braking pressure takes place when the antiskid device operates. If the surface has a good grip a high braking pressure is required to cause the wheels to slip and in this case a partial rapid release of pressure followed by a gradual release of pressure takes place when the antiskid device operates, to prevent excessive lurching during operation of the anti-skid device and to assist in a satisfactory anti-skid operation despite changing surface conditions.
Abstract:
AN ANTISLIP DEVICE THE COMPRESES AIR BRAKES WITH A DOUBLE-SEATED VALVE HAVING A VALVE MEMBER CONNECTED TO A PISTON WHICH DIVIDES A FIRST CHAMBER COMMUNICATING WITH A DECELERATION DETECTOR FROM A SECOND CHAMBER WHICH IS IN COMMUNICATION WITH THE THE FIRST CHAMBER THROUGH A THROTTLING CONSTRICTION, IN WHICH THE PISTON IS CONNECTED TO A PART OF A TELESCOPIC VALVE FOR EXHAUSTING THE SECOND CHAMBER, AND THE LENGTH OF THE STROKE OF THE TELESCOPIC VALVE IS LESS THAN THE LENGTH OF THE STROKE OF THE VALVE MEMBER OF THE DOUBLE-SEATED VALVE.
Abstract:
A method for adjusting brake pressures on pneumatically operated wheel brakes of a motor vehicle includes adjusting, in a normal braking mode, the brake pressures depending on a driver brake request; and adjusting, by a control unit in a pressure control mode, the brake pressures at the respective wheel brakes during reception of an external brake request, which is independent of the driver brake request and defined for the control unit as an external target deceleration value, as a function of a resulting target deceleration value of the vehicle deceleration. The control unit determines the resulting target deceleration value by linking the external target deceleration value according to the external brake request and a value corresponding to the driver brake request. A braking power index is determined which quantitatively represents the braking effect of the wheel brakes, and is provided to be taken into account in pressure control mode.
Abstract:
A brake system of a vehicle is described, including a vehicle dynamics controller (ESP) for influencing the vehicle behavior in the dynamic driving limit range, with a service brake valve for generating a pressure dependent on the driver's desired braking, at least one pressure sensor for generating a signal dependent on the pressure generated by the service brake valve, at least one shuttle valve including a valve member for transmitting the pressure generated by the service brake valve or an accumulator pressure or a pressure derived from the latter to at least one brake cylinder, depending on the level of the respective pressure acting on the valve member, in which at least one pressure sensor is integrated in a shuttle valve and is combined therewith to form an assembly.
Abstract:
A valve, for use with a vehicular brake system including an electronic control unit, including a valve body, a pressure regulator internal to the body, a solenoid valve internal to the body and a double-check valve internal to the body. The electronic control unit (ECU) controls the traction control valve during two modes of vehicle operation. The regulator assembly is in fluid communication with the pressurized air supply and regulates the air supplied to the brake system during one mode of operation. The solenoid valve receives pressure-regulated air from the regulator assembly and is controlled by the electronic control unit during the two modes of operation. The single double-check valve receives pressure-regulated air from the solenoid valve and receives pressurized air from the supply, such that the double-check valve allows the pressure-regulated air to flow from the solenoid valve to the brake system during the one mode of operation, and allows the pressurized air to flow from the pressurized air supply to the brake system during the other mode of operation.
Abstract:
An adaptive braking system for an automotive vehicle is disclosed which includes a duty-cycle generator that generates a control signal for actuating a solenoid valve which controls braking pressure in the vehicle''s brake actuators. The duty-cycle generator produces a pulsed output which actuates the solenoid valve; the width of the pulses being modulated so that rather precise control of the braking pressure is attained. The width of the pulses is determined by input signals representing wheel acceleration, wheel slip, and an error term. The adaptive braking cycle is initiated whenever wheel acceleration drops below a predetermined low deceleration level, or when wheel deceleration is maintained in a band between two deceleration levels for a sufficient time period. On the other hand, adaptive control of the vehicle''s brakes is terminated whenever uninhibited fluid communication to the brake actuators is required or when wheel speed drops below a predetermined low reference guide.