Wabco Westinghouse Fahrzeugbremsen Gmbh

Wabco Fahrzeugbremsen Gmbh

Wabco Vermogensverwaltungs Gmbh

Detlev Neuhaus

Karl-Heinz Hesse

Peter Liermann

Gerhard Ruhnau

Wolfgang Lichtenberg

Hartmut Schappler

Joachim Abel

Wolfgang Stehr

Michael Muller

Gerald Ulbrich

Jorg Schroder-Berg

A pressure control apparatus for adjusting the brake pressure in a braking system of a vehicle comprises a reservoir in which a pressure fluid is stored, an outlet through which the pressure fluid is discharged, at least one brake cylinder of the braking system, inlet and outlet valves through which the pressure fluid is supplied to and discharged from the brake cylinder, and a digital controller which controls the opening and closing of the inlet and outlet valves to minimize the deviation between an actual value and a command variable. The digital controller comprises individual controllers associated with the inlet and outlet valves. The individual controllers operate in accordance with a changeable PIDD.sup.2 control formula. The digital control further comprises a three-stage controller connected downstream of the individual controllers and adjustable low pass filters for the inlet and outlet valves. A pressure phase detector determines the current pressure phase to be set (i.e., increase, maintain or decrease) based on the command variable, and adjusts the operation of the individual controllers, the three-stage controller, and the low pass filters based on the current pressure phase.

Pressure control apparatus for adjusting brake pressure in a vehicle

An electronic brake system for road vehicles includes a decentrally formed electronic device and at least one central module. The central module includes at least one microprocessor with its individual intelligence. A module (1, 2, 3, 4) is coordinated in each case to a respective wheel. The modules (1, 2, 3, 4) also include microprocessors with an individual intelligence function. The wheel modules are hierarchically subordinated to the central module (5, 6). The central module (5, 6) is integrated system-wide into the remaining vehicle electronics. This means that the central module (5, 6) receives signals such as steering angle, vehicle deceleration, values delivered imposed by the driver such as brake requirement, parking brake, retarder, etc. which are of importance for the entire vehicle. The wheel modules (1, 2, 3, 4) are responsible primarily for the supply and the operational control of the in each case respective wheel. The wheel modules (1, 2, 3, 4) include amongst other things the respective power stage (35), which controls the brake-pressure modulator (29) of the respective brake cylinder (30). The wheel modules ( 1, 2, 3, 4) include the electronic devices belonging in addition to the respective wheel such as, for example, an antilock control channel coordinated to the wheel.

Electronic brake system for road vehicles

The invention relates to an analog non-contact distance sensor which includes a fixed stationary annular magnetized armature. The stationary armature member is provided with an air gap into which is disposed an element which is sensitive to a magnetic field. The moving portion is a rod-shaped magnetic core member which can be inserted into the annular armature member. Depending on the depth of insertion of the core member, the amount of diversion of the magnetic field from the air gap of the armature is controlled. Consequently, the magnetic sensing element emits an electrical signal which corresponds to the distance travelled by the movable core member.

Magnetic-type of analog distance sensor having a hall effect sensing

An arrangement for determining the position of a core within a coil improves a voltage across the coil upon generation of an initiating voltage pulse. The initiating voltage pulse can originate from a microprocessor or other electrical timing logic circuit. The charging current in the coil is developed from this initiated time until either a predetermined current level is reached in one embodiment or a predetermined time duration is reached in another embodiment. A microprocessor or other electrical measuring circuit measures either the time duration to reach the predetermined current level or the discharge time following current charging for the predetermined time duration. A microprocessor or other electrical logic circuit derives the core position from the measured time to reach the predetermined current level or the measured discharge time following current charging for the predetermined time duration. A switching element interrupts the charging of the coil before the current can reach a peak level, such timing measurement thereby occurring during the approximately linear portion of the inductive current charging curve.

Inductive measuring arrangement for determining the position of a

A multiplex cabling system for controlling electrical apparatus on motor vehicles, which consists of a central transmitter and several area transmitter-receivers, each connected to several controlled devices and/or indicators. Coupling between the central transmitter and the area units is made by a star-arranged line system which consists of a separate, two-wire connecting channel between the central transmitter and each area transmitter-receiver. To further increase the system's reliability and security, the central transmitter includes two microprocessors which are normally assigned to control a different pair of diagonally-opposite area transmitter-receivers. If one processor fails, the other unit assumes full system control.

Multiplex cabling system for vehicles

A component control arrangement for transit-type vehicles having a distributed plurality of vehicle components to be monitored and controlled, includes a number of function control modules, each being associated with a specific vehicle function; as for example, wheel-skid, climate-control, and verification systems. The function control modules, each communicate in a multiplex arrangement over a shared data bus and a transceiver arrangement, with a distribution unit. The distribution units have an output configuration allowing connection to a variety of vehicle operating devices including lamps, switches, solenoid valves, and electric motors. The function control modules evaluate status indications originating from the vehicle operating devices and transmitted through the distribution units and a transceiver arrangement. The function control modules utilize the status indications to derive control instructions for the vehicle operating devices based on a predetermined set of vehicle operating and safety parameters.

Growing community of inventors

Langenhagen, Germany

Detlev Neuhaus