Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1996-06-11
1998-02-17
Ballato, Josie
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 15, B60T 1368
Patent
active
057184860
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to an electropneumatic brake system in general and more specifically to a pedal-operated electropneumatic brake system.
Pressure medium brake systems which are influenced electrically as well as pneumatically are known (European Patent Document EP-A-0478953), are included one relay valve respectively for admitting pressure to the brake cylinders of the front and the rear axle. Such relay valves have a pressure medium control and an electric control, each electric control being equipped with a solenoid valve. One pressure control device respectively is arranged between the solenoid valve and the relay valve. By such a development of the relay valves, an electric as well as a pneumatic control is made possible.
In the course of the increasing completion of electronically influenced brake systems of motor vehicles, it is required to use electrically as well as pneumatically controlling braking power generators which act at least on the braking system of the rear axle by a redundancy action if the electric control fails. In the case of a conventionally pneumatic braking at the front axle, selectively, an electric or pneumatic control at the rear axle and the linking with electronic components of the brake system is permitted.
It is an object of the invention to develop an electropneumatic brake system of the concerned type such that, while the constructional expenditures are low, the system meets the above-mentioned requirements. These and other objects are achieved by a pressure modulator, which can preferably be used on the brake system of the vehicle rear axle and/or the trailer control valve of a towing vehicle. Electrical as well as a pneumatic control of the relay valve or of the trailer control valve is ensured by a safety of the pneumatic fall-back plane of the pressure modulator. The operating principle of the pressure modulator formed of a proportional valve and a reversing valve can be used on brake systems with a braking power generator which have one pneumatic and one electric or which have two pneumatic and one electric brake circuit or several control circuits of this type. In this case, the pedal-operated braking power generator in the form of a foot brake pedal emits a desired electric to the electronic control unit of the brake system for a further processing, the control unit controlling the individual actuators of the system. Electric signals of a plurality of sensors may be provided to the electronic control unit, which sensors, on the whole, may include the sensors of an EBS-or antilock system and, in their totality, contribute to the control of a desired electric value for the pressure modulator. When a load sensor is used for feeding load signals into the electronic control unit, conventional load-dependent braking power controllers will not be required. If the signals of a coupling force sensor are used between a towing vehicle and a trailer, it is possible to influence the brake system of the trailer corresponding to the coupling force change.
The redundancy action of the pressure modulators is ensured in a constructionally very simple manner, specifically by the linking of the proportional valve with the reversing valve which can be controlled pneumatically as well as electromagnetically and, in the case of a failure of the electric control, will control pneumatically, whether in an assignment to a relay valve for the brake cylinders of the rear axle or in an assignment to a trailer control valve for the trailer of a vehicle which is preferably designed in a dual-circuit manner.
Advantageous developments and further developments are indicated in additional claims.
In the following, the invention will be explained by means of embodiments with reference to the attached drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of an electropneumatic brake system of the invention according to a first embodiment of the invention;
FIG. 2 is a schematic individual of a pressure modulator used in the system accordi
REFERENCES:
patent: 4861115 (1989-08-01), Petersen
patent: 5294190 (1994-03-01), Feldmann et al.
patent: 5302008 (1994-04-01), Miyake et al.
patent: 5549362 (1996-08-01), Broome
Fries Ansgar
Vollmer Otto
Ballato Josie
Knorr-Bremse Systeme Fur Nutzfahrzeuge GmbH
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