JP2015505770A - Accumulator charge pump air venting method and accumulator charge pump air vent device - Google Patents

Abstract

The present invention relates to at least one inlet connecting a livestock reservoir (14) which can be filled using a pressure accumulator charge pump (10) with a filling volume (22) which can be filled using this livestock reservoir (14). Opening the valve (28) and opening the at least one outlet valve (42) coupling the filling volume (22) with the suction side of the accumulator charge pump (10). The present invention relates to a method of bleeding the charge pump (10). The invention further relates to a venting device for the accumulator charge pump (10) of the accumulator (14). [Selection] Figure 2

Description

  The present invention relates to a method for venting an accumulator charge pump. Furthermore, the present invention relates to an accumulator charge pump for a livestock sap, a brake booster and an air vent for a brake system.

  Patent document 1 describes a method and an apparatus for starting and controlling a component in a vehicle, particularly for starting and controlling a pump for loading / filling a pressure accumulator. Patent Document 2 also describes a method for starting and controlling an accumulator charge pump of an electrohydraulic brake device.

German Patent No. 19935371A1 German Patent No. 10215392A1

  The invention has a method for venting an accumulator charge pump having the features of claim 1, an air venting device for an accumulator charge pump of an accumulator having the features of claim 12, and the features of claim 13. A brake booster, a brake system having the features of claim 14, and a brake system having the features of claim 15 are provided.

  The present invention provides an advantageous possibility for venting a pressure accumulator charge pump loaded with a liquid reservoir. Advantageous forms of the present invention include a cleaning method for venting the accumulator charge pump and a cleaning device for the accumulator charge pump of the accumulator. As will be described later, the present invention provides a low-cost configuration that can be realized with little effort or little energy consumption for bleeding the accumulator charge pump of the accumulator.

  According to the present invention, the frequent problem that the accumulator charge pump is relatively sensitive to the air in the sucked brake fluid can be easily and reliably solved. Here, it does not matter whether the air is generated by degassing (isobaric cooling) or poor air bleeding from the liquid pumped using the accumulator charge pump, such as brake fluid.

  In the conventional method, air entrainment in the feed pump often leads to a so-called feed stop, whereas according to the present invention, air entrained in the feed pump can be quickly and reliably removed. This is an inherent advantage over the prior art, especially where an accumulator charge pump controlled in a permanent self-priming operation often cannot automatically resume its function. Therefore, according to the present invention, the usefulness of the accumulator charge pump can be expanded. Together with this, the present invention ensures that the full capacity of the accumulator charge pump function is restored quickly despite air entrainment.

  The present invention suggests that it is particularly useful in an accumulator charge pump that cannot be equipped because of its dead space and / or outlet valve opening pressure. In addition, according to the present invention, it is possible to dispense with an air pump in the accumulator charge pump. In particular, the present invention can be realized at a lower cost than an air pump configured for venting the accumulator charge pump.

  The invention can also be advantageously applied to systems in which the accumulator charge pump is connected via a direct line (suction line) on the suction side to a liquid tank that uses a relatively low pressure, for example about atmospheric pressure. Such a liquid tank that uses a relatively low pressure may be, for example, a brake fluid tank. Conventionally, when the accumulator charge pump is arranged in this way, it is not possible to remove air from the accumulator charge pump using the feed pressure formed on the suction side of the accumulator charge pump during operation. Is possible. Therefore, the present invention can be advantageously applied to many systems such as a brake system.

  Therefore, according to the present invention, in many situations and in many fluid systems, functional failure of the accumulator charge pump, in particular, feed stop of the accumulator charge pump, etc. can be quickly and reliably removed. In this way, the discharge efficiency of the accumulator charge pump is also increased. If the present invention is employed in a brake system, the full capacity of the function of the accumulator charge pump is more reliably guaranteed, so that higher comfort can be realized for the driver of the vehicle equipped with the brake system. In particular, the (automatic) bleed of the accumulator charge pump in the method according to the invention eliminates the need for the driver to find a factory for bleed of the accumulator charge pump, both in terms of time and cost. The burden can be reduced.

  In an advantageous embodiment, liquid from the accumulator is transferred through at least one open inlet valve and at least one open outlet valve so that dynamic pressure is created on the suction side of the accumulator charge pump. The dynamic pressure can be used to quickly and reliably bleed the accumulator charge pump.

  It is also possible to determine at least one accumulator charge state quantity and / or at least one accumulator charge state change before opening at least one inlet valve and at least one outlet valve. The at least one accumulator charge state quantity and / or the at least one accumulator charge state change amount is then followed by at least one given minimum charge state quantity and / or at least one given minimum charge state change quantity. Can be compared. The at least one accumulator charge state quantity is less than the at least one given minimum charge state quantity and / or the at least one accumulator charge state change quantity is less than the at least one given minimum charge state change quantity; Can open at least one inlet valve and at least one outlet valve. This is advantageous because, for example, when a delay in pressure formation in the accumulator is confirmed despite the operation of the accumulator charge pump, it can be estimated with high probability that air has been caught in the accumulator charge pump. . In contrast, at least one accumulator charge state quantity exceeds at least one given minimum charge state quantity and / or at least one accumulator charge state change quantity is at least one given minimum charge state change. When it is confirmed that the amount is exceeded, it can be reliably inferred that it is not necessary to vent the accumulator charge pump. This eliminates the waste of opening at least one inlet valve and at least one outlet valve in such a situation.

  For example, the at least one inlet valve and / or the at least one outlet valve can be controlled to enter a pulsating open state when opening. The pulsating control of at least one inlet valve or at least one outlet valve to enter an open state means that each valve has a fixed given opening and closing timing or a given fixed clock frequency. May be understood as alternately opening and closing. A favorable dynamic pressure can be set on the suction side of the accumulator charge pump by advantageously fixing the opening timing and the closing timing.

  In a further advantageous embodiment of the invention, the at least one outlet valve is opened while the at least one inlet valve is closed. After opening at least one outlet valve, this time opening at least one inlet valve. This ensures that the degree of increase in dynamic pressure formed on the suction side of the at least one accumulator charge pump is reduced. In particular, it is possible to prevent a rapid increase in the formed dynamic pressure. In addition, the dynamic pressure can be reduced in this way.

  In a further advantageous embodiment, the at least one inlet valve and / or at least one outlet valve can be controlled to open pulsatically with a given phase difference when opening. Here, at least one inlet valve is closed and at least one outlet valve is closed while at least one outlet valve is open under the advantageous phase difference and corresponding advantageous opening and closing times. After opening the outlet valve, it is automatic to open at least one inlet valve.

  In a further advantageous embodiment, the accumulated pressure decreases after opening the first inlet valve as at least one inlet valve and after opening the first outlet valve as at least one outlet valve. At least one amount of pressure related to the vessel pressure and / or increasing dynamic pressure can be determined and compared to at least one reference reference amount. In this way, it can be confirmed whether it is sufficient to open only the inlet valve or only the outlet valve in order to form the dynamic pressure necessary for bleeding the accumulator charge pump.

  In a further embodiment, at least one second inlet valve and / or a filling volume that couples the reservoir to the filling volume if the at least one pressure amount is below the at least one comparison reference amount. At least one second outlet valve associated with the suction side of the accumulator charge pump can be opened. This can be increased after an excessively low dynamic pressure is confirmed on the suction side of the accumulator charge pump. Similarly, opening the second inlet valve and the second outlet valve may be stopped if the at least one pressure amount exceeds the at least one comparison reference amount. In this way, unnecessary pressure reduction in the accumulator can be prevented.

  The embodiment described in the above paragraph can be implemented even when the accumulator charge pump of the accumulator is bleed to increase the internal pressure of the storage chamber of the brake booster as a filling volume. In this case, the effects described above can also be realized.

  In a further advantageous embodiment, the vehicle speed of a vehicle equipped with a brake booster is determined before venting the accumulator charge pump. Preferably, the pressure accumulator charge pump is vented only when the vehicle speed of the vehicle equipped with the brake booster is below a given maximum speed. On the other hand, when the vehicle speed is higher than a given maximum speed, it is preferable to bleed the accumulator charge pump for at least a given time. After a given time, the (actual) vehicle speed of the vehicle with the brake booster can be compared with the given maximum speed.

  Preferably, the accumulator charge pump is vented only when the vehicle equipped with the brake booster is at a standstill, where the accumulator charge pump is vented at least when the vehicle speed is not equal to zero. Stop for a given time. Thus, by opening at least one inlet valve, the internal pressure of the storage chamber is increased, so that the vehicle can be prevented from being braked by the brake booster. Accordingly, it is possible to prevent the vehicle from decelerating which is annoying the driver who is driving.

  The advantages listed above are guaranteed even if a corresponding bleed device is provided for the accumulator charge pump of the accumulator.

  A brake booster with a corresponding bleed device also provides the advantages listed above.

  Similarly, the advantages listed above can be realized by a brake system with such a brake booster.

  Furthermore, the advantages mentioned can be realized by providing such a bleed device in the brake system.

  Hereinafter, further features and advantages of the present invention will be described with reference to the drawings.

1 is a flowchart illustrating a first embodiment of a method for venting an accumulator charge pump. FIG. 4 is a schematic diagram of a brake system illustrating a second embodiment of a method for venting an accumulator charge pump. 1 is a schematic diagram of an embodiment of an air vent device for a pressure accumulator charge pump of a reservoir. FIG.

  FIG. 1 shows a flow chart illustrating a first embodiment of a method for venting an accumulator charge pump.

  In the method schematically reproduced in FIG. 1, in step S1, at least one inlet is connected to a reservoir that can be filled using a pressure accumulator charge pump with a filling volume that can be filled using this reservoir. Open the valve. Similarly, in step S2, at least one outlet valve is opened that connects the filling volume that can be filled using the reservoir with the suction side of the accumulator charge pump. The filling volume that can be filled using a liquid reservoir may be, for example, a chamber (reservoir) whose volume may be changed by filling / discharging. Below are examples of suitable filling volumes that can be filled using a reservoir.

  By performing steps S1 and S2, liquid from the accumulator is transferred through at least one open inlet valve and at least one open outlet valve so that dynamic pressure is formed on the suction side of the accumulator charge pump. The Using the formed dynamic pressure, the air entrained in the accumulator charge pump can be pushed out. In this way, the accumulator charge pump can be quickly and surely vented, thereby eliminating or preventing functional failure of the accumulator charge pump due to air entrainment.

  In a further advantageous embodiment, the method comprises an optional step S3 which is performed before opening at least one inlet valve and at least one outlet valve or before steps S1 and S2. it can. In this step S3, at least one accumulator charge state amount and / or accumulator charge state change amount is obtained. The obtained accumulator charge state quantity may be, for example, the liquid level of the accumulator, the amount of liquid injected into the accumulator, and / or the internal pressure of the accumulator. Correspondingly, the determined accumulator charge state change is, for example, the accumulator pressure level increment and / or the accumulator pressure during the specified time and / or during the pumping of the accumulator charge pump. Variations may be included. However, the accumulator charge state amount and / or the accumulator charge state change amount that can be obtained are not limited to the examples listed here.

  The determined accumulator charge state amount and / or accumulator charge state change amount can then be compared to at least one given minimum charge state amount and / or minimum charge state change amount. At least one if at least one accumulator charge state quantity is below at least one given minimum charge state quantity and / or at least one accumulator charge state change is below at least one minimum charge state change Open one inlet valve and at least one outlet valve. This is because at least one accumulator charge state quantity is less than at least one given minimum charge state quantity and / or at least one accumulator charge state change quantity is less than at least one minimum charge state change quantity. When steps S1 and S2 are executed, rewriting can be performed.

  It can be ensured using step S3 that the accumulator charge pump is vented only when it can be reliably confirmed (by the above comparison) that air is entrained in the accumulator charge pump with a high probability. In contrast, at least one accumulator charge state quantity exceeds at least one given minimum charge state quantity and / or at least one accumulator charge state change quantity exceeds at least one minimum charge state change quantity. If this is the case, the method can be interrupted. This eliminates the wasteful effort of removing air that is not present in the accumulator charge pump. However, steps S1 and S2 can be routinely performed after a given period of time without confirming the presence of air in the accumulator charge pump 10 in advance, even without step S3.

  Steps S1 and S2 can be performed simultaneously. In that case, the at least one inlet valve and the at least one outlet valve can be controlled to enter the open state in one relatively long open stage. Alternatively, it can be controlled to pulsatically enter the open state when opening at least one inlet valve and / or at least one outlet valve. Opening at least one inlet valve or at least one outlet valve pulsatically opens and closes each valve with a given frequency and / or period time for a particular opening and / or closing time It may be understood that it is controlled as follows. This can be rewritten as opening each valve by timing control. Opening at least one inlet valve or at least one outlet valve in a pulsating manner can be easily performed, for example, by passing a periodic current signal through an electrically switched valve. Here, the dynamic pressure formed on the suction side of the accumulator charge pump can be set to a preferable value by determining advantageous values for the frequency, the opening timing and / or the closing timing.

  Steps S1 and S2, however, can be performed sequentially or in a partially intersecting manner. For example, step S2 can be started before the start of step S1. This can also be rewritten by opening at least one outlet valve while at least one inlet valve is closed. In this case, the at least one inlet valve is opened after opening the at least one outlet valve. Thus, a sudden pressure increase on the suction side of the accumulator charge pump can be prevented.

  In particular, the at least one inlet valve and the at least one outlet valve can be controlled to pulsately enter an open state with a given phase difference. Thus, by selection of an appropriate phase difference, it can be ensured that at least one inlet valve is opened after opening at least one outlet valve, ie during the open state of at least one outlet valve. This prevents a rapid pressure increase on the suction side of the feed pump.

  In a further advantageous embodiment of the method, after opening the first inlet valve as at least one inlet valve and after opening the first outlet valve as at least one outlet valve, At least one amount of pressure with respect to decreasing accumulator pressure and / or increasing dynamic pressure can be determined. This at least one amount can subsequently be compared to at least one comparative reference amount. At least one second inlet valve coupling the reservoir to a filling volume that can be filled using the reservoir, and / or if the at least one pressure amount is below the at least one comparative reference amount; and / or At least one second outlet valve connecting the filling volume with the suction side of the accumulator charge pump can be opened. This can increase the dynamic pressure that is insufficient to bleed at least one accumulator charge pump by opening at least one second inlet valve or at least one second outlet valve. However, the opening of the second inlet valve and / or the second outlet valve may be stopped if the at least one pressure amount exceeds the at least one comparison reference amount. Thus, only the amount of liquid necessary to form the desired dynamic pressure is discharged from the reservoir. At the same time, undesirable pressure build-up in the filling volume is caused by the transfer of excess liquid from the reservoir via the at least one second open inlet valve into the filling volume that can be filled using the reservoir. It can be prevented from being done.

  The height of the dynamic pressure created using the method described here may depend on the ambient temperature. This dynamic pressure is typically (much) higher at lower temperatures than at higher temperatures. Before the number of opened valves 28 and 42 is increased by pulsatingly opening the valves 28 and 42 and / or determining at least one pressure quantity for decreasing accumulator pressure and / or increasing dynamic pressure. By comparing the pressure amount with the comparison reference amount, the dynamic pressure can be set to a preferable value even if it depends on the temperature.

  The method described in the above paragraph can be applied in particular to bleed the accumulator charge pump of the accumulator in order to increase the internal pressure of the reservoir of the brake booster (as a filling volume). However, it should be pointed out that the feasibility of the method is not limited to the bleed of the accumulator charge pump of the accumulator that cooperates with the brake booster. Similarly, the feasibility of the method is not limited to venting a pressure accumulator charge pump incorporated into the brake system.

  FIG. 2 shows a brake system schematic illustrating a second embodiment of a method for venting an accumulator charge pump.

  It is suggested that the following description of the brake system depicted in FIG. 2 should be construed as merely illustrative. As further described, the feasibility of this method of venting the accumulator charge pump of the accumulator to increase the internal pressure of the variable volume / chamber of the brake booster is a brake system of this type. It is not limited to only.

  The schematically reproduced brake system comprises a pressure accumulator charge pump 10 with a motor 12 that can increase the internal pressure of the pressure accumulator 14. This can also be rewritten as the accumulator 14 can be loaded / filled using the accumulator charge pump 10. The accumulator 14 may in particular be shaped as a high pressure accumulator. However, the method described further is not limited to the loading of this type of pressure sensor 14 alone. Similarly, shaping the accumulator charge pump 10 as a three piston pump is to be understood as merely illustrative.

  In the brake system, the pressure accumulator 14 is hydraulically coupled to the brake booster 16 / brake master cylinder 18 of the brake system, which is also at least one reservoir 20 of the brake booster 16 / brake master cylinder 18. The internal pressure is hydraulically coupled so as to be increased using the pressure formed in the accumulator 14. The brake master cylinder 18 may be shaped as a tandem brake master cylinder. However, the method described further is not limited to this type of brake master cylinder 18 alone.

  Preferably, the pressure accumulator 14 is hydraulically coupled to the front chamber 22 of the brake master cylinder 18. The front chamber 22 may be understood as an internal volume of the brake master cylinder 18, where the variable capacity component 24 of the brake master cylinder 18 partitions the front chamber 22 from at least one storage chamber 20. It is also partitioned so that the total volume of liquid from the front chamber 22 and at least one storage chamber 20 remains constant even when the capacity of the variable displacement component 24 is adjusted. Thus, increasing the volume of the front chamber 22 results in compressing the at least one storage chamber 20 and increasing the internal pressure of the at least one storage chamber 20 accordingly. Correspondingly, a decrease in the volume of the anterior chamber 22 can result in an increase in the volume of the at least one reservoir 20 where it reduces the internal pressure of the at least one reservoir 20.

  In the embodiment described here, the pressure accumulator 14 thus functions as a brake booster of the brake system. (This can also be rewritten if the brake booster in the brake system is realized by a hydraulic device including the accumulator charge pump 10 and accumulator 14.) As described more strictly below, the hydraulic device The illustrated brake system with can be used, for example, in hybrid vehicles or electric vehicles. The reproduced brake system can therefore be referred to as HAS-hev (Hydraulic Actuation System for hybrid electrical vehicles).

  The pressure accumulator charge pump 10 and the pressure accumulator 14 are hydraulically coupled to the front chamber 22 via a line 26. Here, at least one inlet valve 28 / boost valve is arranged in the hydraulic line between the accumulator 14 and the front chamber 22, which also has at least one brake fluid volume from the accumulator 14 open. It is arranged so that it can be transferred into the front chamber 22 through the inlet valve 28. In particular, a plurality of inlet valves 28 are connected to the discharge side of the accumulator charge pump 10 and the pressure sensor 14 via a branch point 30 formed in the line 26 and a branch point 34 formed in the further line 32. May be combined. If the accumulator charge pump 10 is configured as a three piston pump, it is advantageous to use three inlet valves 28. However, the braking system described further is not limited to a specific number of inlet valves 28.

  The suction side of the accumulator charge pump 10 is coupled to the brake fluid reservoir 40 via at least one branch point 38 formed in the return line 36 / reservoir line. The brake fluid reservoir 40 may be coupled to at least one storage chamber 20 of the brake master cylinder 18 via at least one flow port 41.

  Preferably, the suction side of the accumulator charge pump 10 is also coupled to the front chamber 22 via at least one outlet valve 42 / pressure-reducing valve. In this case, after opening at least one outlet valve 42, the brake fluid volume from the front chamber 22 is fed into the accumulator 14 by the accumulator charge pump 10 through the at least one open outlet valve 42. As a result, the volume of the front chamber 22 is quickly reduced, and thereby the internal pressure of at least one storage chamber 20 of the brake master cylinder 18 is quickly reduced. For example, a plurality of outlet valves 42, in particular three outlet valves 42, are connected to a branch point 44 formed in the line 26 on the inlet side and a branch point 46 formed in the return line 36 on the outlet side. It may be.

  A brake booster made from the accumulator charge pump 10 and the accumulator 14 can be controlled using at least one sensor 48 or sensor 50. For example, a first sensor 48 as a pressure sensor may be disposed on the discharge side of the accumulator charge pump 10 and the accumulator 14. A second sensor 50, which may be shaped as a pressure sensor, is in this case preferably connected to the line 26.

  Preferably, by taking into account the prepared sensor signal of at least one sensor 48 or 50, the internal pressure in the at least one reservoir 20 is controlled by an automatic speed control system (ACC) by opening and closing the valves 28 and 42. The volume of the front chamber 22 can be set to be active according to the target deceleration preset by the automatic emergency braking system. The accumulator charge pump 10 and accumulator 14 can now be used in a brake system with an automatic speed control system and / or an automatic emergency brake system.

  Similarly, the driver can be assisted by the accumulator charge pump 10 and the accumulator 14 when operating the brake actuating element 52 to reduce the vehicle speed. For example, at least one actuation sensor 54 can be used, a brake sensor can be used, and / or a brake stroke sensor can be used to ascertain a target deceleration of the vehicle speed preset by the driver. Subsequently, at least one brake circuit 58 that is hydraulically coupled to the at least one reservoir 20 via the feed line 56 (represented only schematically here) or at least one of the at least one brake circuit 58. Using the accumulator charge pump 10, accumulator 14, and valves 28 and 42 to set the volume of the front chamber 22 active so that the desired brake pressure is present in one (not illustrated) wheel brake cylinder. Can do. It is suggested that the brake system reproduced here is not limited to a specific form of at least one brake circuit 58. Therefore, a more detailed description of at least one brake circuit 58 is omitted.

  The accumulator charge pump 10, pressure sensor 14 and valves 28 and 42 now ensure better brake comfort for the user of the brake system. In particular, several times the driver braking force acting on the brake actuating element 52 is exerted on the variable displacement component 24, while the accumulator charge pump 10, the accumulator 14 and the valves 28 and 42 function in an advantageous manner. be able to. The driver therefore does not have to apply all the force applied to the brake actuating element 52 himself to create the desired brake pressure.

  The illustrated braking system can also be used for braking a vehicle with a generator (not shown). In this case, the pressure in the at least one brake circuit 58 can be changed using the accumulator charge pump 10, the accumulator 14, and the valves 28 and 42 in consideration of the increase and decrease in the generator brake torque. For example, by pumping the brake fluid volume from the front chamber 22 through at least one open outlet valve 42, the brake pressure in the at least one brake circuit 58 is responsive to a temporary increase in generator brake torque. Can be lowered. Similarly, by sending the brake fluid volume from the accumulator 14 to the front chamber 22 via the at least one inlet valve 28, the at least one brake circuit 58 can be compensated to compensate for the temporary increase in generator brake torque. The brake pressure can be increased. An advantageous blind operation can now be carried out using the accumulator charge pump 10, the accumulator 14 and the valves 28 and 42 to conceal the generator brake torque.

  A sensing cylinder 60 may be provided between the brake actuating element 52 and the brake master cylinder 18 to ensure additional operating comfort for the user of the brake system. For example, a brake actuating element 52 (represented only schematically here) is coupled to a variable displacement component 62 of the sensing cylinder 60, which divides the entire internal volume of the sensing cylinder 60 into a front chamber 64 and a storage chamber 66. You can do it. In this case, the variable displacement component 24 of the brake master cylinder 18 may be coupled to a piston 68 that at least partially penetrates the storage chamber 66 of the detection cylinder 60. Preferably, the internal pressure of the storage chamber can be changed via a pressure regulator which will be described more strictly below.

  By using this type of detection cylinder 60 together with a pressure regulator, a restoring action that can be separated from the internal pressure of at least one storage chamber 20 of the brake master cylinder 18 can be applied to the brake actuating element 52. In this case, even if the brake pressure is changed in at least one brake circuit 58 in order to hide the generator brake torque, the driver feels a brake feeling (pedal feeling) as normal. At the same time, the driver can intervene via the sensing cylinder 60 so that the braking force is actively applied to the brake master cylinder 18.

  The storage chamber 66 of the detection cylinder 60 may be hydraulically coupled via a line 72 to a branch point 74 formed in the return line 36. Preferably, the hydraulic coupling between the storage chamber 66 of the detection cylinder 60 and the line 72 is shaped as an opening that is closed when the brake actuating element 53 is actuated lightly. On the other hand, the hydraulic coupling between the storage chamber 66 of the detection cylinder 60 and the spring 76 may be shaped so as not to be closed even if the brake operation element 52 is operated strongly.

  The internal pressure of the storage chamber 66 can be actively set to a desired value via a spring 76 via the line 82 and a constantly adjustable valve 80 coupled to the storage chamber 66 via the line 84, respectively. The constantly adjustable valve 80 can therefore also be called a simulator valve. A further permanently adjustable valve 86 is coupled via line 88 to a branch point 90 formed in line 84 and to a branch point 94 formed in line 26 via line 92, respectively. ing. This constantly adjustable valve 86 can also be used to set the internal pressure of the storage chamber 66 of the detection cylinder 60 to a desired value.

  The above components of the brake system including the accumulator charge pump 10, the accumulator 14, at least one inlet valve 28 and at least one outlet valve 42 are not necessarily required to enable the method to be further described. I suggest again that there is no.

  Optionally, the method also includes determining an accumulator charge state quantity and / or an accumulator charge state change. Examples of accumulator charge state quantities and / or accumulator charge state changes that can be determined are as already mentioned above. In particular, the sensor 48 can be used for that purpose. Thus, in particular, by reducing the accumulator charge and / or by comparing the determined accumulator charge state quantity and / or accumulator charge state change with a given minimum charge state quantity and / or minimum charge state change. Alternatively, it can be confirmed whether or not instability has occurred. This can also be called charge gradient monitoring. When it is confirmed that the charge state of the liquid reservoir is out of the target charge state, an air bleeding routine described below can be executed. However, this air bleed routine can be automatically executed in a routine manner after a given time has elapsed without confirming in advance that air is present in the accumulator charge pump 10 without charge gradient monitoring.

  Further, the air bleeding routine can be started or delayed in consideration of the vehicle speed of the vehicle equipped with the brake system. The accumulator charge pump 10 can be vented only when the vehicle speed is below a given maximum speed, for example. This avoids a situation in which the driver cannot understand that the vehicle decelerates as a result of the pressure increase that occurs in the front chamber 22 in some cases and is confused. In contrast, when the vehicle speed exceeds a given maximum speed, the bleed of the accumulator charge pump 10 can be stopped for at least a given time. After the time has elapsed, the vehicle speed can be detected again.

  Preferably, the bleed of the accumulator charge pump 10 is performed only when it is stopped, ie when a given “maximum speed” of a vehicle with a brake booster is equal to zero. Here, when the vehicle speed is not equal to zero, the bleed of the accumulator charge pump is stopped for at least a given time. This is advantageous, especially when there is air in the accumulator charge pump 10 when comparing at least one accumulator fill level quantity to at least one given minimum fill level quantity, This is the case when it is confirmed that the reservoir 14 can be filled at least to a certain minimum filling level amount. In this case, it is possible to wait until the vehicle stops together with the air removal from the accumulator charge pump 10.

  In the air bleeding routine, at least one inlet valve 28 / pressure-increasing valve and at least one outlet valve 42 / pressure-increasing valve are opened, and the return line 36 is directed from the reservoir 14 through the valves 28 and 42 opened. Volume flow is created. When the intended valve switch is made to open valves 28 and 42, the method can be used to vent the accumulator charge pump 10 as per the embodiments of the method already described above. Using that process, the volume flow can be created so that there is a limited dynamic pressure on the suction side of the accumulator charge pump 10.

  When dynamic pressure is created on the suction side of the accumulator charge pump 10, the flow resistance of the filter screen of the housing bore and / or return line 36 can be utilized. When the valves 28 and 42 are opened based on the length of the return line 36 and the pipe diameter, a desired dynamic pressure is generated in the return pump 10. Thus, the present method uses the characteristics of the return line 36 to create a desired dynamic pressure on the suction side of the return pump 10. (This is reproduced in FIG. 2 with the symbol 98.)

  While the valves 28 and 42 are activated to control the pressure accumulator charge pump 10, the motor 12 of the pressure accumulator charge pump 10 is controlled to enter an active state that drives the pressure accumulator charge pump 10. This occurs regardless of whether the valves 28 and 42 are activated to enter a relatively long opening phase or are pulsatically activated with relatively short opening and closing times. This can also be rewritten if the operation of the motor 12 for driving the accumulator charge pump 10 is performed while the valves 28 and 42 are open or through a partial flow. The accumulator charge pump 10 is forcibly filled with dynamic pressure, which can also be referred to as feed pressure, on the suction side of the accumulator charge pump 10. In this way, the air present in the accumulator charge pump 10 (in some cases) is pushed out, so that the full capacity of the function of the bleed accumulator charge pump 10 is again guaranteed. In addition, at this time, the characteristic that the opening pressure of at least one outlet valve of the pressure accumulator charge pump 10 decreases as the storage pressure in the pressure accumulator 14 decreases can be utilized. The air removal of the charge pump 10 is promoted.

  It is suggested that the liquid sent to the suction side of the accumulator charge pump 10 to form the dynamic pressure is again completely returned into the brake fluid reservoir 40. This ensures a quick drop in dynamic pressure after the accumulator charge pump 10 is vented.

  FIG. 3 shows a schematic diagram of an embodiment of a venting device for a pressure accumulator charge pump of a reservoir.

  The air bleeder 100 schematically represented in FIG. 3 can be used, for example, in the brake system already described. However, it should be pointed out that the possible use of the air bleeder 100 is not limited to this brake system.

  For example, the air bleeder 100 is coupled to a filling volume through some of the above-listed components, at least one inlet valve 28, and allows a reservoir to increase the internal pressure of the filling volume. 14 and only the accumulator charge pump 10 whose suction side is connected to the filling volume via at least one outlet valve 42 so that the liquid from the brake fluid reservoir 40 can be pumped into the accumulator 14. It can also be used in the containing system. The venting device 100 can therefore be used in a number of differently shaped systems.

  In particular, the air venting device 100 can be advantageously used in any brake system including the accumulator 14 and the accumulator charge pump 10. There, on the other hand, the accumulator 14 is connected to the filling volume of the brake system via at least one inlet valve 28 so that the accumulator 14 can be used to form the internal pressure of the filling volume, On the other hand, the suction side of the accumulator charge pump 10 is coupled to the filling volume via at least one outlet valve 42, and the accumulator charge pump 10 is used to draw liquid from the brake fluid reservoir 40 into the accumulator 14. If it can be pumped out, it will be enough. Thus, advantageously shaping the filling volume as a reservoir for a brake booster should be construed as merely illustrative. The additional components depicted in FIG. 3 can be omitted in the structure of the brake system that cooperates with the bleed device 100.

  The air bleeder 100 includes an evaluation device 102 that uses at least one accumulator charge state quantity and / or accumulator charge state change 104 provided to the evaluation device 102 to at least one given minimum. It can be compared with the charge state amount and / or the minimum charge state change amount 106. Examples of at least one accumulator charge state quantity and / or accumulator charge state change 104 are as already mentioned above. The at least one accumulator charge state quantity and / or the accumulator charge state change 104 can be provided from the sensor 48 to the evaluation device 102, for example. At least one given minimum charge state quantity and / or minimum charge state change 106 can be output to the evaluation device 102 using the built-in memory unit 108. If at least one accumulator charge state quantity and / or accumulator charge state change 104 is below at least one given minimum charge state quantity and / or minimum charge state change 106, a corresponding evaluation signal 110. Can be output using the evaluation device 102.

  The air bleeding device 100 also includes a control device 112. The controller 112 outputs at least one control signal 114 to the at least one inlet valve 28 and at least one outlet valve 42 to take into account the evaluation signal 110, which is also at least one inlet valve 28 and at least one. The two outlet valves 42 are designed to output so that they can be controlled in their open states. The at least one control signal 114 may be, for example, an analog current signal or a pulsating current signal.

  The air bleeder 100 may be specifically designed to perform the steps already described above of the method of bleed the accumulator charge pump 10. A description of this process is omitted here.

  When the air bleeding device 100 is used, it is utilized that the suction line of the pressure accumulator charge pump 10 is integrated with the return line 36. In order to additionally ensure the reliable formation of the desired dynamic pressure on the suction side of the accumulator charge pump 10, the return line 36 has a relatively large length and / or a relatively small tube diameter. It may be made. However, it is suggested that the characteristics of the return line 36 described here are merely an example.

DESCRIPTION OF SYMBOLS 10 Accumulator charge pump 14 Accumulator or accumulator 16 Brake booster 18 Brake master cylinder 20 Storage chamber 22 Filling volume or front chamber 24 Variable capacity component 26 Line 28 Inlet valve 30 Branch point 32 Line 34 Branch point 36 Return Line 38 Branch point 40 Brake fluid reservoir 42 Outlet valve 44 Branch point 46 Branch point 48 Sensor 50 Sensor 52 Brake actuation element 54 Actuation sensor 56 Feed line 58 Brake circuit 60 Detection cylinder 62 Variable displacement component 64 Front chamber 66 Storage chamber 72 Line 74 Branch point 76 Spring 80 Constantly adjustable valve 82 Line 84 Line 86 Constantly adjustable valve 100 Air venting device 102 Evaluation device 104 Accumulator charge state quantity and / or accumulator char Minimum di state variation 106 charged state quantity and / or minimum charge state variation 108 memory unit 110 evaluate signals 112 control device 114 control signals

Claims (15)

A method of venting an accumulator charge pump (10), comprising:
At least one inlet valve (28) that couples a livestock reservoir (14) that can be filled using said accumulator charge pump (10) with a fill volume (22) that can be filled using this stockpile (14). ) Is opened (S1), and
Opening at least one outlet valve (42) connecting the filling volume (22) to the suction side of the accumulator charge pump (10) (S2);
Including methods.   The at least one open inlet valve (28) and the at least one open liquid are passed from the animal simmer (14) so that a dynamic pressure is formed on the suction side of the accumulator charge pump (10). The method of claim 1, wherein the transfer is through an outlet valve (42).   Determining at least one accumulator charge state quantity and / or at least one accumulator charge state change before opening the at least one inlet valve (28) and the at least one outlet valve (42); Compared to one given minimum charge state quantity and / or at least one given minimum charge state change, wherein the at least one accumulator charge state quantity is the at least one given minimum charge state quantity And / or if the at least one accumulator charge state change is less than the at least one given minimum charge state change, the at least one inlet valve (28) and the at least one outlet valve. The method according to claim 1 or 2, wherein (42) is opened.   The method according to one of the preceding claims, wherein the at least one inlet valve (28) and / or the at least one outlet valve (42) are controlled to enter a pulsating open state when opening.   The at least one outlet valve (42) is opened while the at least one inlet valve (28) is in a closed state, and the at least one outlet valve (42) is opened. The method according to claim 1, wherein (28) is opened.   The method according to claim 5, wherein the at least one inlet valve (28) and the at least one outlet valve (42) are controlled to open pulsatically with a given phase difference when opening.   After opening the first inlet valve (28) as the at least one inlet valve (28) and then opening the first outlet valve (42) as the at least one outlet valve (42) The method according to one of the preceding claims, wherein afterwards at least one pressure quantity for decreasing accumulator pressure and / or increasing dynamic pressure is determined and compared with at least one comparative reference quantity.   At least one second inlet valve (28) coupling the animal simmer (14) with the filling volume (22) if the at least one pressure amount is below the at least one comparison reference amount; and 8. The method according to claim 7, wherein at least one second outlet valve (42) is open which couples the filling volume (22) with the suction side of the accumulator charge pump (10).   The method according to claim 1, wherein the pressure accumulator charge pump (10) of the animal sap (14) is vented to increase the internal pressure of the reservoir (22) of the brake booster as the filling volume.   The accumulator charge pump is vented when the vehicle speed of the vehicle equipped with the brake booster is below a given maximum speed, and when the vehicle speed exceeds the given maximum speed, the accumulator charge is removed. 10. A method as claimed in claim 9, wherein the pump (10) is de-aired for at least a given time.   The pressure accumulator charge pump (10) is vented when the vehicle equipped with the brake booster is stopped, and when the vehicle speed is not equal to zero, the accumulator charge pump (10) is vented. The method of claim 10, wherein the method is discontinued for at least a given time. A venting device (100) for a pressure accumulator charge pump (10) of a reservoir (14),
An evaluation device (102), which is used to provide at least one accumulator charge state quantity and / or accumulator charge state change (104) provided to the evaluation device (102); The minimum charge state quantity and / or the minimum charge state change quantity (106), wherein at least the at least one accumulator charge state quantity (104) is the at least one given minimum charge state quantity ( 106) and / or if the at least one accumulator charge state change (104) is below the at least one given minimum charge state change (106), a corresponding evaluation signal (110) is obtained. Output is possible, and
A control device (112) is used, which takes into account the evaluation signal (110) and allows at least one control signal (114) to be filled using the animal simmer (14). 22) towards the at least one inlet valve (28) connecting the animal simmer (14) and the filling volume (22) with the suction side of the accumulator charge pump (10) Output to at least one outlet valve (42) that is also controllable so that said at least one inlet valve (28) and said at least one outlet valve (42) each enter their open state. Air venting device that is capable of output. A livestock stool (14) coupled to the reservoir (22) of the brake booster via at least one inlet valve (28), so that the internal pressure of the reservoir (22) can be increased,
The suction side is connected to the reservoir (22) of the brake booster via at least one outlet valve (42) and pumps liquid from the brake fluid reservoir (40) into the reservoir (14) A pressure accumulator charge pump (10), and
Air bleeding device (100) according to claim 12.
A brake booster comprising:   A brake system comprising the brake booster according to claim 13. In combination with a filling volume (22) of the brake system that can be filled using the animal simmer (14) via at least one inlet valve (28), so that the internal pressure of the filling volume (22) can be increased. Livestock slaughter (14),
The suction side is coupled to the filling volume (22) via at least one outlet valve (42) so that liquid from the brake fluid reservoir (40) can be pumped into the reservoir (14). The accumulator charge pump (10), and
Air bleeding device (100) according to claim 12.
A brake system comprising:

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