Pumps – With condition responsive pumped fluid control – Plural separate sensing means for a single fluid controller
Patent
1997-10-29
2000-07-18
Freay, Charles G.
Pumps
With condition responsive pumped fluid control
Plural separate sensing means for a single fluid controller
417302, 417307, 417308, 417304, 303 3, 303 7, F04B 4900
Patent
active
060898313
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a compressed air supply device for vehicle compressed air systems. The subject of the invention is also a process for controlling a compressed air supply device of this kind.
EP 0 523 194 B1 has disclosed a compressed air supply device of this kind for vehicle compressed air systems. It is provided with an air compressor that can be shut off, in order to feed compressed air via an air drier into a reservoir. A pressure sensor disposed on the reservoir monitors the pressure of the injected air. Its pressure value is evaluated by control electronics in order to switch the air compressor on and off. In addition, the humidity of the air in the system is sensed and the control electronics control the regeneration of the air drier as a function of pressure and humidity. EP 0 523 194 B1 contains no indications about the remaining embodiment of the compressed air system and the safeguarding of the compressed air reservoir.
National regulations and international guidelines require the presence of a number of compressed air consumer circuits in vehicle compressed air systems in order to assist in retaining the function of the brake system in the event of a failure of the brake circuit. Furthermore, a reciprocal safeguarding of the circuits is stipulated so that if one circuit fails, the function of the undamaged circuit is retained. Therefore, overflow valves with limited return flow are disposed on the outlet side of the air drier of the compressed air system, and several of them are combined into one safety valve, for example according to DE 42 09 034 A1. In addition to the object of distributing the compressed air to the various consumer circuits and safeguarding these in relation to one another in the event of a failure of a circuit as well as against the failure of the air compressor, here, moreover, the primarily important filling of selected consumer circuits is assured. With overflow valves of this kind, the system-specific opening and closing pressures are determined based on structural conditions and are not subject to any outside influences when the compressed air system of the vehicle is operated.
ADVANTAGES OF THE INVENTION
The compressed air supply device according to the invention has the advantage over the prior art that in a vehicle specific manner or as a function of the operating conditions of the compressed air system or the vehicle, the programmable control electronics can select and control or regulate the supply of compressed air into the consumer circuit and the withdrawal of compressed air from a circuit for transfer into another circuit or for the purpose of regenerating the air drier. As a result, in comparison to the prior "rigid", i.e. defined operating mode of the compressed air supply device, this permits the achievement of a more rapid operational readiness of the compressed air system, an energy savings in the operation of the air compressor, an increased security from the loss of compressed air when a circuit is damaged, a filling of the consumer circuits to different, changeable pressure values, and an economical regeneration of the air drier that fulfills the requirements. In order to adapt the compressed air supply device to various vehicle compressed air systems or changed operating conditions, the only thing required is an intervention into the control electronics by inserting or changing a corresponding control element.
Advantageous improvements and updates of the compressed air supply device are possible by means of the measures setforth hereinafter.
With the equipping of the compressed air supply device, which equipping is extraordinarily simple in terms of the device, the above-mentioned advantages are achieved, without jeopardizing the operational safety since the suggested locking members, the pressure sensors, and the control electronics have a high degree of functional safety.
However, if the proven pneumatic-mechanical safeguarding of the compressed air system, for example according to DE 42 09 034 A1 should be retained, then the
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Alt Matthias
Bruehmann Werner
Freay Charles G.
Greigg Edwin E.
Greigg Ronald E.
Knorr-Bremse, Systeme fur Nutzfahrzeuge GmbH
Tyler Cheryl J.
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