Wabco Westinghouse Fahrzeugbremsen Gmbh

Wabco Fahrzeugbremsen Gmbh

Wabco Standard Gmbh

Wabco Westinghouse Gmbh

Johann Rothen

Erwin Petersen

Hartmut Rosendahl

Manfred Schult

Johannes Moller

Lutz Weise

Gerhard Ruhnau

Gunther Singbartl

Hans Holst

Gerald Stanusch

Ralf Koschorek

Otto Friederichs

Harald Kaess

Siegfried Hofler

Gerd Kruger

Bernd Zobirei

A process for braking a vehicle which comprises applying to a front axle group and to a rear axle group front axle brake pressure (p.sub.1) and rear axle brake pressure (p.sub.2) in accordance with wear-optimized curves when a deceleration command signal (S) is less than or equal to a predetermined switch-over deceleration command signal (S.sub.1). When the deceleration command signal (S) is greater than the switch-over deceleration command signal (S.sub.1), the front axle brake pressure (p.sub.1) and the rear axle brake pressure (p.sub.2) are applied in accordance with parabolas which pass smoothly through a point on the wear-optimized curves which corresponds to the switch-over deceleration command signal (S.sub.1), and at least one point on curves for equal adhesion utilization of the front axle group and the rear axle group, which point corresponds to a second deceleration command signal (S.sub.2).

Process for braking a vehicle

An error detection and display system for an apparatus having first and second operating states comprises a testing device, a display unit (e.g., a warning light), and a switch-on control unit. The testing device runs primary error test cycles for detecting errors of a first kind which occur during the first operating state of the apparatus (e.g., a vehicle at standstill), and secondary error test cycles which occur and can be detected only in the second state of the apparatus (e.g., the vehicle moving above a predetermined minimum speed). The system also includes a non-volatile memory wherein all occurrences of errors of the second kind are stored. The switch-on control unit switches on the testing device and the warning light when the vehicle is first started. If no error of the first kind is detected by the testing device and no error of the second kind is stored in the error memory, the switch-on control unit switches off the warning light while the vehicle is still at a standstill. However, if an error of the second kind is stored in the error memory, the switch-on control unit will keep the warning light on until the vehicle is traveling above the predetermined minimum speed and no new errors of the first or second kind are detected by the testing device.

Error detection and display system

A method for the braking of a vehicle train with pressure-actuated brakes and arrangements for performing this method are disclosed. The prior art shows that, because of a different rapid build-up of a braking pressure in the various rigid vehicles of a vehicle train, there occurs an overrun shock during adjustment transition shifting braking phases. According to one embodiment of the invention, there is furnished a lead and predominance by a predetermined value in the co-braking signal furnished from the one rigid vehicle to the second rigid vehicle of a vehicle train. According to a further embodiment, a predominance by a predetermined amount in the braking pressure in the second vehicle versus the co-braking signal is furnished, if during the preceding brake application actuation the overrun shock has surpassed a preset tolerance width. The invention can be applied in particular for vehicle trains made up of a motor vehicle and one or several trailers or semitrailers.

Tractor and trailer braking control system to prevent trailer overrun

An apparatus for the recognition of a rising slope is provided in particular for commercial vehicles, such as trucks or busses. The device comprises at least one sensor (1) for the axle load of the rear axle and/or of the front axle, as well as a device (4) for measuring the vehicle acceleration relative to the road. The signals of the sensor (1) and of the device (4) are fed into an electronics (2). The electronics (2) recognizes from these fed-in data, whether the vehicle is disposed on an uphill grade or on a downhill grade or on level ground. The thus generated signal can be further employed in various electronic systems, for example, in an automatic drawbar force control system.

Device for recognition of driving on a grade

A relay valve unit having a control pressure communication line for the relay valve equipped with a reducer unit so that when activating the relay valve, any delay is either non-existent or negligibly larger than would be required for the complete opening of the relay valve.

Relay-controlled valve

A solenoid-controlled valve arrangement is provided which includes a relay valve having in its control line a series arrangement of a shut-off valve and a shifting valve. Each of the shut-off valve and the shifting valve is solenoid-controlled.

Solenoid-controlled valve arrangement

Apparatus for continuously controlling an electrically-actuated solenoid valve which regulates the fluid pressure conveyed to a brake cylinder. The solenoid valve is designed for intermittent operation. A pressure transducer senses and generates an actual value signal, which is proportional to the pressure to be regulated. A set value generator produces a select set value signal. A comparator device generates a pulse-type control signal having a variable width repetition rate within a certain pressure range for the solenoid valve in accordance with the difference between the actual value signal and the set value signal. In order to regulate the pressure more precisely and more quickly, without dependence on outer influences, the comparator device generates the control signal for controlling the solenoid valve within a predetermined initial pressure range, in accordance with the actual value pressure sensed by the pressure transducer in such a way that the solenoid valve is slightly opened by being pulsed from a closed-valve position.

Apparatus for the continuous control of solenoid valves which are

A fluid pressure responsive brake system for the trailer of a vehicle. The brake system includes a trailer supply circuit, which can be connected with the supply circuit of the tractor and which can be connected with an electrical trailer brake circuit, which is connected with the brake system emitting electrical brake signals and the electrical feed of the tractor. There is an electro-fluidic switching apparatus with an OR circuit, by means of which and in connection with an electronic control unit of the trailer, the brakes of the trailer are set if the trailer brake system is separated from the supply circuit of the tractor and/or from the electrical brake signals or the power supply of the tractor.

Fluid pressure responsive brake for the trailer of a vehicle

An improved vehicle wheel anti-lockup brake control system in which a shutdown signal is generated to disable the wheel anti-lockup control system in the event of a malfunction, as determined by the concurrent presence of a wheel slip signal and a low wheel speed signal (generated by the same wheel) for a predetermined period of time sufficient to allow a normally operative anti-lockup control system to correct a slipping wheel before it locks up.

Circuit for the shutdown of an anti-lockup protected vehicle brake unit

A controllable filter circuit for removing noise from the useful picked up speed sensing signal in an anti-skid vehicular braking system. The controllable filter circuit includes a pickup device, a frequency dependent low-pass filter, a sine-wave to rectangular-wave converter and threshold circuit, a frequency to voltage converter and a switching circuit for actuating the low-pass filter for dampening and blocking troublesome noise signals from the speed signals prior to feeding them to logic, amplifying and output devices.

Growing community of inventors

Sarstedt, Germany

Johann Rothen