CN1826255A

CN1826255A - Method for refilling brake circuits after a large consumption of compressed air and device for carrying out said method

Info

Publication number: CN1826255A
Application number: CNA2004800213341A
Authority: CN
Inventors: C·戴特来福; H·戴克梅耶; F-D·利普尔特; J·莱因哈荻特; B·斯特利卡
Original assignee: Wabco GmbH
Current assignee: ZF CV Systems Hannover GmbH
Priority date: 2003-07-28
Filing date: 2004-07-12
Publication date: 2006-08-30
Anticipated expiration: 2024-07-12
Also published as: CN100478227C

Abstract

The invention relates to a method for refilling operational brake circuits (26, 28) after a large consumption of compressed air. The operational brake circuits are compressed air consumer circuits of a consumer part (6) of a compressed air system for motor vehicles. The operational brake circuits also comprise at least one additional compressed air consumer circuit provided with a compressed air container. The aim of the invention is to continuously determine the actual pressure value in the operational brake circuits and the other compressed air consumer circuits (30, 32, 34, 36) and to compare said values to a lower threshold value. If said values fall below the threshold value, the identified operational brake circuits are blocked as defective and a connection is established between the other compressed air consumer circuits with the compressed air container and the intact operational brake circuits in order to refill said operational brake circuit from the compressed air containers of the at least one other compressed air consumer circuit.

Description

Fast behind the consumption of compressed air to the gas filed again method of brake circuit and carry out device

The present invention relates to a kind of preamble, be used for after quick consumption of compressed air and finish the device of this method the gas filed again method of brake circuit according to claim 1.

Multiloop protective valve commonly used can be divided into energy source several and independently consume the loop mutually, even when the loop et out of order, for example during pipeline breaking, still can keep minimum pressure in loop in working order.When the amount of air of loss greater than compressor can replenish the time, the pressure in the detection discovery foot brake loop can descend, when reaching the shutoff pressure of valve only.Although the pressure in the fault loop continue to descend, and pressure keeps the value of shutoff pressure in loop in working order.Though the pressure in the fault loop continue to descend, this moment, compressor still can put on the air to loop in working order still, up to reach fault loop open pressure the time till.So just set up a kind dynamical equilibrium, though this moment, pressurized air still can continue to supply gas to loop in working order (and secondary consumption loop), and air is also continuing in the loss at fault loop place.Shortcoming is, using compressor to inflate needs the relatively long time, and the supplied capacity of compressor is less relatively, has only about 200 to 400 liters of per minutes usually.Therefore, the rated energy in the brake system is recovered slowly, and this safety to system is unfavorable.

The purpose of this invention is to provide a kind of method and the device of finishing this method, thereby can promptly in brake circuit, recover air pressure behind the consumption of compressed air fast.

This purpose can be realized by the invention according to claim 1.A kind of device that is used for finishing this method has been described in claim 5.

Advantage of the present invention and favourable improvement have illustrated in the appended claims.

The present invention is envisaged in after the quick consumption of compressed air, except compressor, consumes the loop by a high pressure again and inflates to brake circuit.Usually, the air that the common in unit time of high tension loop can be carried (the thousands of liters of Chang Gaoda/minute) will be much larger than a compressor (being generally 200 to 400 liters/minute), therefore with compare with compressor, faster to the meeting of inflation again that brake circuit in working order carries out.Like this, therefore, by a fault loop in the brake system that may cause the minimizing of rated energy can in the extremely short time, just obtain recovering.This point is even more important when break in the loop.Distribute energy can improve the safety of system greatly between this loop.According to the present invention, this is to be realized by the motorized valve of closing under normal conditions that is provided with in the high tension loop, preferably is an electromagnetic valve (or pilot-operated valve).Other consumption loop (comprising brake circuit) is provided with the motorized valve of opening under normal conditions, preferably is electromagnetic valve.All electromagnetic valves interconnect by a shared distribution pipe.In order to inflate to brake system, the electromagnetic valve of high tension loop must switch to open position, so that pressurized air output high tension loop.Like this, by all electromagnetic valves of opening, pressure or energy just are transformed into brake circuit in working order and have suffered.

To on the basis of accompanying drawing, be described in more details below, a real example be shown in these accompanying drawings the present invention, wherein:

Fig. 1 shows a block scheme that brake circuit is carried out again gas filed newly-designed device after quick consumption of compressed air; And

Fig. 2 shows to the brake system chart that pressure changes in the gas replenishment process again.

In the accompanying drawings, the effective solid line of pressurized air represents that the circuitry lines with dashed lines is represented.

There is shown one and have pressurized air supply section 4 and the compressed air system 2 that consumes part 6.Pressurized air supply section 4 comprises a compressor 7, a compressor control device 8 and a dry air part 10.

But consume electric actuation

electromagnetic valve

16,18,20,22,24 and a plurality of

consumption loop

26,28,30,32,34,36,38 that part 6 is provided with pressurized air distribution pipe 14, a plurality of band recovery spring., these consume the loop and obtain pressurized air by electromagnetic valve.

One pressurized air supply pipe 40 leads to distribution pipe 14 from compressor 7 by a filter 42, an air dryer 44 and a boiler check valve 46, and all

arms

48,50,52,54,56 that lead to all electromagnetic valves are arranged from distribution pipe 14.

Compressed air tube

58,60,62,64,66 leads to the consumption loop by all electromagnetic valves.Pipe 62 is provided with Zhi Guanzi 62 ' and 62 ", they lead to

loop

30 and 32, at pipe 62 " also put in locating and dispose boiler check valve 68.In supply pipe 52, dispose a voltage limiter 70.Lead to the downstream branch of the pipe 54 of electromagnetic valve 22 at voltage limiter 70.Pipe 64 is provided with branched pipe 64 ' and 64 ", they lead to loop 34 and 36.

Pressure in

pressure sensor

72,74,76,78,80,82 monitoring all consumption loops and the distribution pipe 14, and each pressure is transferred to the electronic control unit 84 of all electromagnetic valves of direct control as pressure signal.

Except pressure, also can monitor other state variable, as consuming air rate, air quality and the energy etc. in loop and the connection pipe.

Consume

loop

26,28 and can be the foot brake loop.Consume loop 30 and can be the trailer braking protection valve loop.At this moment, common two tubes a: supply pipe and a brake pipe that leads to trailer.Consume loop 32 and can be the hand braking loop that has spring accumulator.Consuming

loop

34 and 36 and can be secondary consumption loop, as operator's compartment suspension, door controller etc., in other words, promptly is the assembly that all and brake circuit have nothing to do.Consume loop 38 and can be high tension loop.

Foot brake loop

26,28 is provided with the pressurized air reservoir vessel 90,92 of conform European standard (EU Directive) 98/12.High tension loop 38 is provided with pressurized air reservoir vessel 39.

Can omit pressurized air storage container in the

loop

30,32,34,36 by compressed air system of the present invention.As an example,, can allow to carry out air feed to other consumer by foot brake loop (loop 26 and 28) as long as the braking function or the braking maneuver of

foot brake loop

26 and 28 are not weakened.

By a pipe 40 ', compressor 7 is controlled by compressor controller 8 machineries (pneumatic).Compressor controller 8 comprises the less electromagnetic valve of a Nominal Width 94 compositions, and this electromagnetic valve can be switched by electronic control unit 84.As shown in the figure, it is opened under the normal condition of outage, thereby compressor 7 is started.If close compressor 7, for example when being full of pressurized air in all consumption loops, control unit 84 is the position of switching solenoid valve 94 just, and the compressor that pressure is driven start cuts out by pipe 40 '.If electromagnetic valve 94 is switched to off-position, for example consume the loop when needing pressurized air and electromagnetic valve 94 is switched to the normal condition shown in the figure once more when one, thereby thus, pipe 40 ' is opened, compressor 7 starts heavily again like this.

Dry air part 10 comprises that one has the electromagnetic valve 100 of less Nominal Width, the import 102 of this electromagnetic valve is connected logical with distribution pipe 14, and the outlet 104 by this electromagnetic valve is connected with the shut off valve 106 by air operated control, this valve that dams is connected with the supply pipe 40 of compressor 7, is used as the deflation hole of air dryer.

When electromagnetic valve 100 was switched to connected state, compressor 7 was no longer supplied gas in consuming the loop, but arranged to atmosphere by valve 106.Meanwhile, dry air then by distribution pipe 14 (being connected) with the storage container 90,92 in foot brake loop through electromagnetic valve 100, flow regulating valve 108 and boiler check valve 110 air dryer 44 of flowing through, thereby make its desiccant regeneration, air passes through filter 42 and valve 106 exhaust to atmospheres more then.

Label 112 expressions one overpressure valve.

Electromagnetic valve

16,18,20,22,24 is by control unit 84 control, and the normality the when electromagnetic valve 16 to 22 that consumes loop 26 to 34 is in outage is opened, and the electromagnetic valve 24 of high tension loop 38 is in the normality of outage and closes.Also can use guiding control change-over valve.Pressure in the loop is directly detected at the electromagnetic valve place by

pressure sensor

72,74,76,78,80.

Consume the loop as working as one, when for example the pressure in loop 30 (trailer braking protection valve loop) will descend, the foot brake loop can be opened all electromagnetic valves and be supplied pressurized air, the pressure that voltage limiter 70 can consume secondary in the loop 30 to 36 is adjusted to than the lower level of the pressure in foot brake loop 26 and 28 (for example 10.5bar), for example 8.5bar (seeing below).Usually, high tension loop 38 is normally closed by electromagnetic valve 24, does not communicate with other loop.It has higher stress level, for example a 12.5bar.

In compressed air system of the present invention, all pressure that consume in loops 26 to 38 carry out measured quantity by partial pressure sensor 72 to 80, and by these sensors the electron pressure signal are passed to electronic control unit 84 and add in order to assessment.Control setup compares a force value and a lower limit of being surveyed, and to consume the pressure that will adjust in loop corresponding with each for this lower limit.When the pressure in the brake circuit owing to fast consumed cabin air or pipe break or damaged this lower limit that drops to when following, control setup switches to open position with the electromagnetic valve 24 of high tension loop 38, like this, high tension loop promptly is communicated with

brake circuit

26 and 28 by connection pipe 14 and the

electromagnetic valve

16 and 18 opened, and will exist the energy in the high tension loop to import in the brake circuit in working order, implement inflation again to brake circuit in working order.Simultaneously, control setup 84 switches to off position by the electromagnetic valve with fault loop, and fault loop is closed.At this moment, compressor 7 also begins to brake circuit air feed in working order.

Because the amount of air stream that the high tension loop in unit time is carried to brake circuit is widely greater than compressor (reach thousands of liters/minute), gas filed again speed is very rapid, as above described, the capacity of employed compressor is about about 200 to 400 liters/minute in the present embodiment.

Control setup is as long as one detect that high tension loop and the institute pressure in the gas filed brake circuit equates or brake circuit when having reached given force value, and it just closes electromagnetic valve 24 at once, and being communicated with between cut-out and brake circuit once more.

Method of the present invention guarantees the energy distribution in consuming the loop, thereby can obtain foolproof operation operating mode.

Fig. 2 shows brake circuit, and for example brake circuit 26 is at instantaneous point 120 places during because of the pipeline breaking et out of order, and the pressure when at instantaneous point 124 places brake circuit 28 in working order being inflated again changes.Along with the pressure decay in the loop 26 (curve 72), pressure in the brake circuit 28 (seeing curve 74) and the pressure in connection pipe 14 (not shown) also descend brake circuit 28 pneumatic communications.The result of the pressure decay in the connection pipe 14 is that the electromagnetic valve 94 of opening compressor starts at 121 places constantly at instantaneous point.In order to inflate once more to brake circuit 28 in working order, the electromagnetic valve 24 of high tension loop 38 switches to open mode at instantaneous point 124 places, almost meanwhile, by closing electromagnetic valve 16 brake circuit 26 that damages is closed.Thereby loop 28 in working order, if needed comprises that also the loop 30 and 36 (

loop

30 and 36 also is in working order certainly) of pneumatic connection can be inflated fast again.In whole exhaust process, the pressure in the

loop

30 and 36 does not almost change, and voltage limiter 70 guarantees that pressure sensor separates (seeing shown in the dotted line pressure curve among Fig. 2) with distribution pipe 14.

In Fig. 2, diagram electromagnetic valve 16 is closed at instantaneous point 123 places, and is very close in time with instantaneous point 124 herein; To carry out more detailed explanation to this below.At instantaneous point 124 places, when the electromagnetic valve 24 of high tension loop 38 is opened at instantaneous point 124 places and fault brake circuit 26 when closing herein, the then very fast rising of the pressure in the brake circuit 28, the pressure in high tension loop and brake circuit equate or when reaching the setting pressure of brake circuit till.The pressure decay of high tension loop in the process of this fast aeration can obtain monitoring (seeing the pressure decay curve 80 of high tension loop 38 at instantaneous point 124 places) at pressure sensor 80 places.After obtaining enough replenish air, a period of time is closed in loop 28 by electromagnetic valve 18 is switched to the resistance blocked state at instantaneous point 125 places.At this moment, because compressor starts in the startup that instantaneous point 121 goes out because of electromagnetic valve 94, high tension loop is inflated by compressor again, and compressor starts electromagnetic valves from the moment 121 and just starts for 94 that times.In order to finish this charge operation (instantaneous point 126 places) again and again, should reset the control signal of

electromagnetic valve

94 and 24 once more, just electromagnetic valve 94 is switched on, and electromagnetic valve 24 is switched to the normality of closing once more.Subsequently, the control signal of brake circuit 28 is also reset (instantaneous point 127 places), just electromagnetic valve 18 is switched to the normality of opening once more.

Label 122 and two time lengths of 123 expressions are that 0.2 second locking detects impulse singla (blocking pulse), and for example, this pulse was sent to the control input unit of electromagnetic valve 16 before the instantaneous point 124 that can be determined locking in fault loop 26.Such locking detects the safety mensuration (being loop 26 in this example) that pulse can be used for fault loop.At instantaneous point 122 places, the dwell that locking detects pulse demonstration electromagnetic valve 16 is 0.2 second.The result of this locking rises the pressure at pressure sensor 74 places in the unaffected brake circuit at once, and this is that pressure storage container 92 can be once more to loop in working order 28 gas filed causes because hinder loop 26 for some reason and when interruption when exhaust.For fault loop, because the repressurize of being undertaken by intact loop is hindered, with regard to fault loop 26, promptly during detecting the plug pulse persistance, locking at pressure sensor 72 places pressure decay has faster taken place.Owing to during locking detects pulse persistance, have only the pressure in the loop 26 to descend fast, so just strengthened the not suspection of fault being arranged for this loop.In order to determine whether this conclusion is correct, valve 16 can be closed with the form of pulsation and come this test of repetition for several times.In the example of Fig. 2, carrying out the second time at instantaneous point 123 places also is last test.Can determine finally that now loop 26 is fault loops.After this (from instantaneous point 124) is just forever by locking.

Claims

One kind pressurized air consume fast or loss after to the gas filed again method in all foot brakes loop, wherein all foot brakes loop is that a pressurized air that consumes part of a compressed air system of vehicle consumes the loop, this system is provided with at least one additional compressed air that has the pressurized air storage container and consumes the loop, it is characterized in that, at least one additional compressed air that has the pressurized air storage container consumes foundation connection between loop and all foot brakes in working order loop, thereby can inflate to these foot brake loops from the pressurized air storage container at least one additional compressed air consumption loop again.
2. the method for claim 1 is characterized in that, comprises step down:

Constantly measure the actual value that all foot brakes loop and at least one additional compressed air consume state variable (pressure, air rate, air quality, energy) in the loop;

An actual value and a low extreme value are compared;

When being lower than this limit, the result cuts off all foot brakes loop that is detected as fault loop; And

The pressurized air storage container that consumes the loop from least one additional compressed air is inflated to all foot brakes in working order loop again.
3. method as claimed in claim 2 is characterized in that, it is corresponding that limit and each pressurized air consume the state variable that will adjust in loop.
4. the method for claim 1, it is characterized in that, when state variable that at least one additional compressed air consumes loop and all foot brakes loop equated or reach the setting value of state variable in gas filed all foot brakes loop again, the connection that at least one additional compressed air consumes between loop and all foot brakes in working order loop was hindered.
One kind in having the vehicle of compressed air system pressurized air consume fast or loss after to the gas filed again device in all foot brakes loop, this compressed air system is provided with all pressurized air consumption loop that a compressed air gas source partial sum with compressor comprises all foot brakes loop, all pressurized airs consume the loop and replenish pressurized air by all electric actuation valves, wherein all foot brakes loop and at least one additional compressed air consume the loop and are provided with the pressurized air storage container, pressure in all pressurized air consumption loop is by all sensor monitors, the electric signal of these sensors is assessed by an electronic control unit of all electric actuation valves of control, it is characterized in that, the motorized valve (24) that is provided with at least one additional compressed air consumption loop (38) of a pressurized air storage container cuts out under outage or pilot operated normality, and all foot brakes loop (26,28) and all additional pressurized airs consume loop (30,32,34,36) motorized valve (16 in, 18,20,22) under pilot operated normality, open, wherein state variable (the pressure in electronic control unit (84) all foot brakes loop that will constantly record, air rate, air quality, energy) a value and a limit are relatively;

When being lower than limit, the result cuts off all foot brakes loop that is detected as damage or fault loop; And

The motorized valve (24) that will have at least one additional compressed air consumption loop of pressurized air storage container switches to the open position, so that consume foundation connection between loop and all brake circuits in working order at least one additional compressed air that has the pressurized air storage container, thereby inflate again to these foot brake loops from the pressurized air storage container at least one additional compressed air consumption loop.
6. device as claimed in claim 5, it is characterized in that, when for example descending fast owing to pipeline breaking or the damaged value that makes state variable (pressure, air rate, air quality, energy), electronic control unit (84) switches to off position with the motorized valve in fault foot brake loop.
7. device as claimed in claim 5 is characterized in that, at least one has the stress level that the additional compressed air of pressurized air storage container consumes in the loop (38) and will be higher than than the stress level in foot brake loop (26,28).
8. device as claimed in claim 5, it is characterized in that, the motorized valve (16,18) in all foot brakes loop (26,28) all is connected with a shared pressurized air distribution pipe (14) with the motorized valve (20,22,24) that all additional pressurized airs consume loop (30,32,34,36), and this distribution pipe is connected compressor (7) with one pressurized air supply pipe (40) is communicated with.
9. device as claimed in claim 5, it is characterized in that, when state variable that at least one additional compressed air consumes loop (38) and gas filed more all foot brakes loop (26,28) equate or all foot brakes loop in state variable when having reached setting value, control unit (84) will have the motorized valve (24) at least one additional compressed air consumption loop (38) of pressurized air storage container once more and close.
10. device as claimed in claim 5 is characterized in that, it is corresponding that limit and each pressurized air consume the state variable that will adjust in loop.
11. a described device as in the claim 5 to 10 is characterized in that all motorized valves are electromagnetic valve.