DE19935371A1 - Procedure for controlling at least one component in vehicle braking system has levels of operating noise, environment noise and/or inner cabin noise of vehicle determined and control is undertaken accordingly - Google Patents

Abstract

The levels of operating noise and/or environment noise and/or inner cabin noise of the vehicle braking system are detected by sensor system (109) and provided from control units (110), fed to control unit (107) of braking system to control components like pump (104), pump motor (105) and valve (116). Pulse-interval relationship for timing of pump is varied according to the noise.

Description

The present invention relates to methods and devices for controlling components in a vehicle according to General terms of the independent claims.

State of the art

DE 195 48 248 A1 describes one method and one Device for controlling a pump electro-hydraulic braking system proposed. Here the hydraulic fluid is transferred from a pressure accumulator Valves inserted into the wheel brake cylinder, the Pressure accumulator is loaded with a pump. The pump will controlled in such a way that the loading of the Pressure accumulator by the pump as silently as possible he follows. This is made possible by a predefinable requirement Pulse pause ratio, especially taking into account of resonance effects and / or a pressure in the pressure accumulator reached. The pump with the situation-dependent minimum necessary power operated to a strong Avoid noise.

DE 44 29 373 A1 shows the activation of another Component in the vehicle, an electromagnetic valve,  in particular a brake system, which is also under the Specification is carried out, the noises occurring minimize. This is achieved in that the usual Reversing from a first to a second switching position, especially in the forward direction, in a first phase for a predetermined time according to the current for valve actuation a first function from a first to a third Current value drops and approximately in a second phase remains constant, with the third current value above one second current value, which is used to achieve the second Switch position serves. Again, this is a complex process shown that the limitation of noise is used.

A control that serves the same purpose Noise reduction is in DE 196 08 992 A1 shown. It is used as a generator system Component for an internal combustion engine by lowering the Excitation current under certain circumstances Noise generation from the generator reduced. The Excitation current reduction is done with the help of a control section carried out, which from supplied or stored Information determines the conditions for lowering and outputs corresponding control signals. The plays Generator temperature and that detected by a sensor Structure-borne noise of the generator plays a role. Here too is a very elaborate process related to the To keep the generator's noise emissions low.

It has been shown that the prior art mentioned does not provide optimal results in every respect. On the one hand, there are very complex control and Evaluation techniques necessary to the functionality of the individual components despite less noise to maintain within the necessary framework. On the other hand there is still a loss of sections of the possible  Work area of the components contained in the vehicle due to the noise-reducing measures. Someone specific Loss of performance due to the compromise between minimally necessary in terms of function and noise maximum desired control can be in the prior art cannot be prevented.

Advantages of the invention

The inventive device and method for Control of at least one component in a vehicle, at what operating noise and / or ambient noise and / or interior noise occur, have the advantage in that the component is dependent on this occurring operating noises and / or ambient noises and / or interior noises and / or at least one the operating noises and / or the interior noises and / or the ambient noise of the vehicle influencing variable is controlled, a reduction in Functional scope can be largely avoided.

This means that in noise areas regarding the mentioned types of noise, in which the Noise development of individual components in the vehicle camouflages, the components in full functionality can be operated without a perceptible additional noise is generated.

Due to the possibility of the invention Component control dependent on at least one Driving and / or operating noises of the vehicle influencing size, especially the driving speed and / or the engine speed, allows a waiver complex control processes, as they are in the prior art  are described. The driving noises include Ambient and / or interior noise of the vehicle.

The at least one is advantageously noise-influencing size on which the depends Component is controlled, not directly with the control or control of the component correlates, such as. B. Driving speed and / or engine speed with respect to a Pump control of a brake system. This pulls the Control depending on the size that influences the noise no functional interference, in particular Functional loss in the actual component control or control after itself.

The device according to the invention and the methods can advantageous in a braking system, especially one electrohydraulic brake system for controlling the components there, in particular at least one pump and / or at least one valve can be used.

The device and the method in a fuel supply system, with regard to the components there. In particular systems with a fuel buffer, which are loaded to build up pressure, allow with regard to the Pump control the use of the method and Contraption.

But also all other components when controlling them Operating noise can arise with the help of the procedure and an associated device operated in this way be that without any performance loss or a necessary very complex control strategy that resulting operating noise of the respective component in other noises with higher levels in each  Frequency are camouflaged so that the noise of the Component, especially in the interior of the vehicle, not is noticeable.

The noises that serve as camouflage are advantageously with the help of those detected by sensors Sizes and / or with sizes that are related to the Show or influence noise representable.

drawing

The invention is illustrated in more detail below with reference to the figures of the exemplary embodiment shown below. Here, FIG. 1 shows a braking system in a general form. In Fig. 2, the control of a pressure-promoting means and / or a valve means of the brake system is shown in a flow chart. Fig. 3 shows a control of the pressure-promoting agent and / or the valve means in dependence on the vehicle speed. In FIG. 4, the control of the pressure-promoting agent and / or the valve means is shown n depending on the engine speed.

Description of the embodiments

Fig. 1 shows a brake system, in particular an electro-hydraulic brake system in which the brake fluid is controlled from a pressure accumulator 103 via valves 116 in the wheel brake cylinders 112 to 115. The pressure accumulator is loaded with a medium which conveys the pressure medium in the form of a pump 104 . This charging should be done without any noticeable noise.

In the brake system shown, a brake pedal 100 is shown, which is connected to a master brake cylinder 102 . Pressure can be built up in the master brake cylinder 102 via the brake pedal. The master brake cylinder 102 is in contact with a reservoir 101 . Lines for the pressure medium lead into the brake system 106 from the master brake cylinder 102 and the reservoir 101 . The brake system 106 comprises valve means and possible pressure sensors as well as a possible pedal travel simulator in the case of an electro-hydraulic brake system and other components known from the prior art depending on the embodiment of the brake system. In a line between the reservoir 101 and the brake system 106 , the medium conveying the pressure medium is shown in the form of the pump 104 . 105 shows a drive for actuating the pump, for example in the form of an electric motor. A pressure accumulator 103 is attached between the pump 104 and the brake system 106 . A valve means in the brake system, here between reservoir 101 and wheel brake cylinder 115, is shown as an example at 116 . The other valve means of the brake system 106 are omitted for reasons of clarity. The brake system 106 is connected to the wheel brake cylinders 112 to 115 via lines for the pressure medium. The control or regulation of the controllable or regulatable components of the brake system is represented by the control unit 107 . The connections leading or leading away from the control unit 107 to the corresponding actuator system and / or sensor system are indicated schematically in line bundle 111 . Only the control lines 108 for the pump motor 105 and the line 117 of the valve 116 are lifted out. 109 shows additional brake system external sensors. Element 110 represents further possible control units which are connected to the control unit 107 of the brake system. For example, variables such as vehicle speed and / or engine speed and / or ambient noise and / or operating noise and / or interior noise are detected via the sensor system 109 . Comparable information can also be queried via other control units 110 and transmitted to the control unit 107 of the brake system. Depending on the sizes or noises recorded in this way, the components of the brake system can now be controlled. The pump motor 105 assigned to the pump 104 and thus the pump itself, which is controlled via line 108 , and an exemplary valve means 116 , which is regulated via line 117 , are selected as examples.

The pump motor 105 is driven in a clocked manner. The pulse-pause ratio PPV on which the pump 104 or the pump motor 105 is based is varied in dependence on the vehicle and / or ambient noise or at least one variable influencing it. The control of the valve can also be carried out depending on this. Valves are primarily meant that are actuated, but do not immediately result in an undesired increase or decrease in brake pressure when driving, or all valves of the brake system are possible if a change in brake pressure in the form of increase or decrease is desired. When using z. B. linear valves, i.e. valves that not only have an open and a closed position, but in which z. B. by pulsed or clocked control any opening cross-section and thus any flow rate of pressure medium can be specified, the control can be carried out analogously to the control of the pump shown below.

In FIG. 2, the pump drive in the form of a flow chart is shown. Block 200 represents a higher-level logic for a system or a regulation for influencing the braking effect and / or for increasing the stability and safety of the vehicle. This higher-level logic 200 can be accommodated in the control unit 107 from FIG. 1 or in one further higher-level control unit, which is represented by 110 . Due to the processes in the higher-level logic 200 , a pump request is issued in block 201 . On the basis of the pump request in block 201 , at least one of the previously addressed variables is determined or read in block 202 . A variable representing the ambient noise and / or the operating noise and / or the interior noise of the vehicle or a variable influencing these noises is therefore read in or determined. In a special embodiment, this is, for example, the vehicle speed and / or the engine speed. The sizes can be determined, for example, by evaluating a characteristic curve or a map. Depending on the at least one variable used from block 202 , a pulse width modulated signal control is then carried out in block 203 . The pulse-pause ratio PPV on which this control is based is varied depending on the variables previously entered. For the pump, this means the higher the vehicle speed or engine speed, e.g. B. with an internal combustion engine, the longer the pump can be switched on, that is, the higher the pulse-pause ratio up to full activation without pauses and a pulse duration of 100% of the activation cycle duration. Advantageously, the specification of the PWM signal does not have the highest priority in terms of noise. For this reason, priority assignment in terms of security is possible in block 203 . This means that e.g. B. a situation-dependent full control of the pump z. B. can be equipped with a higher priority than the possibly reduced control in the same situation under noise aspects in a regulation of the braking effect and / or driving stability. Likewise, a possible time condition or a predeterminable drive cycle length of the pulse-width-modulated signal can be specified in block 203 .

A check is then made in query 204 as to whether the pump request from block 201 is still present. If this is the case, block 202 is reached again, in which the current variables relating to the operating noise and / or the interior noise and / or the ambient noise or their noise level are read in or determined.

For example, a comparison means in the control unit 107 enables the level superimposition of the component noises and the operating and / or ambient and / or interior noises to be checked.

If the pump request is no longer present, block 205 is reached , in which the pump is switched off. This can be done, for example, by specifying a pulse pulse pause ratio of 0% pulse duration.

It is also conceivable in block 205 , depending on the size read in block 202, to let the pump continue to run for a predefinable time, for example in order to increase the pressure. After the pump has been switched off or the predefinable time condition for the pump run-on has expired, block 200 is returned to the higher-level logic, as a result of which the pump is switched off for this.

Fig. 3 shows a characteristic curve K1 a possible connection of the V depending on the vehicle speed pulse pause Verhältnises PPVv on the vehicle speed v. Starting at a speed v0 of the vehicle, the associated pulse-to-pulse ratio PPV1, which is the maximum possible in terms of noise, is stored in the characteristic curve K1. This can e.g. B. in advance in the experiment or by a learning system in the operation of the vehicle itself. In the case of the lowest speed v0, PPV1 is the associated maximum value of the pump control, for which the pumping noise can be camouflaged in the other noises, and thus in this case is of equal importance with the starting value for the pulse-pause ratio PPVs1. With increasing speed v, which is correlated with increasing noise, the pulse-pause ratio PPVv can now be increased depending on characteristic curve K1. This happens until a final value PPVe1 for the pulse pause ratio is reached. This can be a definable end value or the full control of the pump with a pulse-pause ratio of 100% pulse duration. The associated speed at which this full control can be camouflaged in the other noises is v1. From this speed v1, the pump can be controlled with the predefinable pulse-pause ratio PPVe1, without the running noise of the pump being noticeably noticeable or perceptible.

As in the case of the vehicle speed in characteristic curve K1, a characteristic curve K2, which represents a pulse-pause ratio depending on the engine speed PPVn over the engine speed, can be evaluated for control in FIG. 4. For a lowest speed n0, in particular 0, a pulse-to-pulse ratio PPV2 is specified. In the special case, this corresponds to the starting value for the pulse pause ratio PPVs2. An increase in the engine speed n further allows an increase in the pulse pause ratio PPV, as a result of which the pump noise can still be camouflaged in the detectable engine noise, which is correlated with the engine speed. This pulse-pause ratio now increases, as shown in characteristic curve K2, up to an engine speed n1. A final value PPVe2 of the pulse-pause ratio is reached at engine speed n1. As in FIG. 3, this can be a predeterminable end value as well as full control with a ratio of 100% pulse duration. From motor speed n1, the pump can thus be controlled with the final value for the pulse-to-pulse ratio PPVe2, without the resulting noise being noticeably noticeable or perceptible.

In a further embodiment, this can Pulse pause ratio also combined from several sizes for example from vehicle speed and engine speed be determined and specified. It will Pulse pause ratio PPVv, which results from the Vehicle speed v results, stored in characteristic curve K1. Likewise, the pulse pause ratio PPVn, which results from the Engine speed n, in particular of an internal combustion engine, results in characteristic curve K2. Then the Maximum value of these two pulse pause ratios PPVv and PPVn at the respective point in time as the resultant Pulse pause ratio PPV for controlling the pump motor used. Here again on the priority assignment indicated under security aspects. This means that if a higher one for safety reasons Pulse pause ratio PPV should be necessary, this independently can be adjusted by the noise. Next the maximum value formation is also, for example Averaging the two recorded at a time Pulse pause ratios with regard to characteristic K1 and characteristic  K2 conceivable. Other links of the individual Pulse pause ratios are conceivable here. The Period of the clocking is at the maximum value formation however, may be smaller than that Overrun time constant of the pump motor.

In general, the control of the pump be less than the noise possible, especially at e.g. B. higher speed or higher engine speed. The The invention thus allows the performance of the considered component, e.g. B. the pump without the Neglecting noise aspects.

Instead of or in addition to the described adjustment of the Pulse pause ratio can also be the frequency of the Control signal itself depending on occurring Ambient noise and / or interior noise and / or Operating noise of the vehicle and or this influencing variables can be varied.

A comparable control, for example taking into account the vehicle speed or the engine speed, is also conceivable for valve means 116 via control line 117 . Measures such as those from the prior art for noise reduction in valve actuation, depending on other noises, are not necessary.

The same applies to other components of the vehicle such as for example a fuel pump, a Vehicle generator, other engines in the vehicle, such as Electric motors, the unit of an air conditioning system or one Coolant pump, etc.

Claims (10)

1. A method for actuating at least one component in a vehicle, the level of noises that are generated when the component is actuated being characterized in that the levels of operating noise and / or ambient noise and / or interior noise of the vehicle are also determined and the actuation the component depending on the occurring operating noises and / or ambient noises and / or interior noises is carried out in such a way that the levels of the noises of the component are at least partially superimposed on the levels of the operating noises and / or ambient noises and / or interior noises occurring. 2. Method for controlling at least one component in a vehicle, at least one operating size of the Vehicle is determined, with the activation of the Component noises arise characterized in that at least one company size is determined, the Operating noises and / or interior noises and / or Affects ambient noise of the vehicle and  the component depending on the at least one Operating noises and / or interior noises and / or Influencing ambient noise of the vehicle Operating size of the vehicle is controlled such that Component noise from operating noise and / or interior noises and / or ambient noises are at least partially covered. 3. The method according to claim 1, characterized in that the component is controlled so that the noise the component from the operating noises that occur and / or ambient noise and / or interior noise be covered in the audible range. 4. The method according to claim 1, characterized in that the control of the at least one component, the Control of a pump corresponds. 5. The method according to claim 1, characterized in that the control of the at least one component, the Control of a medium promoting a pressure medium in a braking system, especially in one electrohydraulic brake system. 6. The method according to claim 1, characterized in that the the interior noise and / or the operating noise and / or the ambient noise of the vehicle influencing variable a speed of a motor of the Vehicle and / or a driving speed of the vehicle is. 7. Device with a control unit for control at least one component in a vehicle, with first Means, which the level of the control of the Identify component noise,  characterized in that second means are included, which also the levels of occurring others Operating noises and / or ambient noises and / or Determine interior noise and the control unit Component depending on the through the second means determined level of operating noise and / or Ambient noises and / or interior noises in this way controls that this level by the first means at least determined level of the noise of the component partially overlay. 8. Device with a control unit for control at least one component in a vehicle, with first Means the at least one operating size of the vehicle determine, when controlling the component There are noises characterized in that the first means at least one company size determine the operating noise and / or Interior noise and / or ambient noise of the Vehicle affected, especially one Driving speed and / or an engine speed, and the control unit the component depending on the at least one operating noise and / or Interior noise and / or ambient noise of the Vehicle influencing operating size of the vehicle so controlled that the noise of the component of the operating noises and / or interior noises and / or ambient noise at least in part be covered. 9. Control unit for controlling at least one component in a vehicle associated with first means stands, which is the level of the control of the Identify component noise,  characterized in that the control unit Contains comparison means for levels of noise and the Control unit depending on the component second means determined levels of operating noise and / or ambient noise and / or interior noise controlled in such a way that these levels by the first Average determined level of the noise of the component at least partially overlay. 10. Control unit for controlling at least one component in a vehicle associated with first means stands, the at least one operating variable of the vehicle determine, when controlling the component There are noises characterized in that the first means at least one company size determine the operating noise and / or Interior noise and / or ambient noise of the Vehicle affected, especially one Driving speed and / or an engine speed, and the control unit the component depending on the at least one operating noise and / or Interior noise and / or ambient noise of the Vehicle influencing operating size of the vehicle so controlled that the noise of the component of the operating noises and / or interior noises and / or ambient noise at least in part be covered.