WO2007141086A1

WO2007141086A1 - Control system for adapting an actuating force provided for controlling a brake mechanism unit

Info

Publication number: WO2007141086A1
Application number: PCT/EP2007/053892
Authority: WO
Inventors: Johannes Bentner; Alexander Kalbeck
Original assignee: Siemens Aktiengesellschaft
Priority date: 2006-06-08
Filing date: 2007-04-20
Publication date: 2007-12-13
Also published as: RU2008152786A; CN101466580A; EP2024207A1; JP2009539666A; DE102006026735A1

Abstract

In order to adapt an actuating force (F) which is provided for controlling a brake mechanism unit, a control system has an electronic device (EGE) for generating the actuating force (F), which electronic device (EGE) can be controlled by means of a control unit (SU). The control unit (SU) is set up to monitor the occurrence of at least one event (E1 - E9) which reduces the generated actuating force (F), wherein in the event of the occurrence of at least one of the events (E1 – E9), the generated actuating force (F) is compared with at least one predefined nominal actuating force (Fsoll), and a control signal (ss) is generated as a function of the comparison result by the control unit (SU), which control signal (ss) is passed to the electronic device (EGE) in order to adapt the actuating force (F).

Description

description

Control system for adapting a control force provided for controlling a brake-mechanical unit

The invention relates to a control system for adapting a provided for controlling a brake mechanism unit actuating force according to the preamble of claim 1.

Conventional parking brakes or parking brake systems example ^¬ as disc, drum or "drum-in-hat" braking system and are well known from the prior art, the brake force is adjusted manually via a provided in the vehicle braking ^¬ lever. Here, by means of the brake lever manually generated a force, which is transmitted via a Seilzugsys ^¬ system for the parking brake. Depending on the voltage applied to the parking brake force of a braking force by the parking brake generated which is transmitted to the brake mechanism unit of the parking brake. the braking force generated is thus proportional to the over the cable system via Wear ^¬ NEN restoring force. in the presence of a predetermined force is thus directly a predetermined braking force to the brake mechanism unit.

Due to wear and aging processes, the braking characteristics may change over the life of such a mechanical parking brake system, in particular the er ^¬ heightened braking force at constant force nachlas ^¬ sen. However, such a decelerating braking force can be technically easily compensated by tightening the force on the shift lever.

In certain brake systems, for example, due to de ^¬ technical realization a superimposed force reduce the actual braking force. Possible interference effects are here, for example, the forces men of parallel Bremssyste ^¬ generated such as a hydraulic transmission over ^¬ for combined brake calipers or the rollback and suspension For example, when rolling back a vehicle on an incline, forces are generated which are superimposed on the braking forces on the parking brake and thus reduce the actuating force transmitted via the cable traction system Parking brake systems is such a reduction of the actuating force, in turn, technically easily compensated by manual tightening of the brake lever.

Furthermore, electric parking brake systems are known in which the electric parking brake is applied or released by actuating a touch or switching module. In such ^¬ step elekt parking brake, the actuating force generated by means of an electric motor is provided transmission unit, which is controlled via a control system. For example, the force generated by the electric motor ^¬ gear unit is transmitted directly to a possibly provided cable system for actuating the Bremsenmecha- nikeinheit and thus the parking brake.

Conventional electric parking brake systems allow only ^¬ ing a tightening and loosening the brake mechanism unit, but give the driver no accurate feedback of the currently applied force. The latter only assumes that the actuating force is too low when the vehicle is no longer held and rolls away by the electric parking brake system. For this purpose, electric parking brake systems escape ^¬ oped that recognize such a rolling of the vehicle and it depends tighten the force were. However, such an adjustment is usually only within a predetermined period of time after switching off the ignition or the engine of the vehicle. The disadvantage of such a parking brake system is that it is not possible to prevent the vehicle from rolling away at any time due to a decrease in the actuating force.

Based on the cited prior art, the invention is based on the object, a control system for adaptation specify a provided for controlling a brake mechanism unit actuating force, which allows an automatic and relo ^¬ tional tightening of the force generated by an electronic device without manual intervention by the driver.

The object is based on the preamble of independent claim 1 by its characterizing features ge ^¬ triggers. Advantageous embodiments of the invention can be found in the further dependent claims.

An important aspect of the control system of the invention to adapt the provided for controlling a brake mechanism unit restoring force is to be seen in that the control unit for monitoring an occurrence of at least one of the actuating force generated reducing event is arranged, wherein upon the occurrence of at least one of the events he ^¬ witnessed Adjusting force is compared with at least one predetermined Sollstell ^¬ force and depending on the comparison result by the control unit, a control signal is generated, which is controlled to adjust the actuating force to the electronic device. By means of events predefined in the control system, the different causes, which can lead to the occurrence of superimposition forces and possibly to a reduction in the actuating force dependent thereon, are determined and monitored particularly advantageously. Upon detection of at least one of the causes or the event responsible for the occurrence of an overlay force, the control unit checks whether a drop in the currently generated actuating force is below a predefined setpoint force. In this case, the desired ^actuating force indicates, for example, that ^actuating force which is at least necessary, for example, for safely stopping the vehicle. Is the force generated by the elekt ^¬ tronic device is not sufficient to generate the force required for safe parking of the vehicle braking force, the force is for example dependent adapted from each present event. Here ^¬ through an automated and above all safe demand pulling a vehicle provided in an electronic parking brake system without intervention and verification of the driver realized. Particularly advantageous is performed by the control system thus depends on the situation, namely on the occurrence of those events in which a drop in the force is to be expected, an adjustment of the restoring force of the at least one elekt ^¬ tronic parking brake system.

Further advantageously, the temporal connection is made between see the occurrence of at least one event and the Un ^¬ fallen short of at least detects a predetermined desired force by the generated force, for which purpose the time associated with a predetermined desired period of time is compared and depending on the comparison result, the restoring force of the electronic device is adapted.

This ensures that the drop in actuating force is attributable to no damage or fault of the electronic parking brake system and thus an adjustment or retightening of the actuating force would cause damage to electronic and / or mechanical components of the parking brake system.

In the following, the invention will be explained in more detail with reference to an exemplary embodiment with reference to drawings. Show it:

Fig. 1 by way of example a block diagram of a Steuersys ^¬ tems for adjusting the restoring force at least of an electronic parking brake system, and

2 shows by way of example a flow chart of a control for adjusting the actuating force.

1 shows by way of example in a schematic block diagram a control system or a control arrangement for adjusting the actuating force of at least one electronic parking brake system EPB. The electronic Parkbremssys ^¬ tems EPB, for example, has an integrated control unit SU, which is connected to an electronic device EGE for generating an actuating force F. The control unit SU has, for example, a processor unit CU and a memory unit MU connected to it. In an alterna tive ^¬ embodiment, the control unit SU may be arranged spatially separated from the electronic parking brake system EPB or may be integrated into an existing ECU of the vehicle at least partially.

The electronic device for generating a force F is formed in a preferred embodiment as an electric motor gear unit EGE. Depending on a control signal SU generated by the control unit SU, the actuating force F is generated by the electric motor transmission unit EGE. The actuating force F is transmitted from the electric motor transmission unit EGE, for example, directly or indirectly to a brake mechanism unit BMU, which is in operative connection with the electric motor transmission unit EGE, for example via a cable pull system SZS.

The control system SS has a touch or switching module SM, which is connected to the control unit SU. By Actu ^¬ tion of the sensing or switching module SM at least one switching signal sw is generated, which is transmitted to the control unit SU, in particular the processor unit CU. The switching module SM is ereinheiten in a preferred embodiment, inside the vehicle, preferably arranged in the cockpit area of the vehicle and via a wireless or wired interface or possibly further provided in the vehicle STEU ^¬ connected to the control system SS.

A running in the processor unit CU control and evaluation routine SAR, the switching signal sw is evaluated and it generates ss depends on the control signal, which is subsequently ^¬ ßend controlled to the electric motor-gear unit EGE. Depending on the applied control signal ss a force F is generated by the electric motor-gear unit EGE, which is transmitted to the brake mechanism unit BMU for braking the Rä ^¬ R, ie the parking brake or parking brake of the vehicle is tightened or released. The brake mechanism unit BMU, for example, a brake ^¬ covering module BBM and cooperating with the brake drum module BTM have, wherein the brake lining module BBM is pressed onto the brake drum module BTM, depends on the applied control force F to produce the braking effect.

According to the illustrated in Fig. 2 flowchart of the parking brake after the actuation of the electronic parking brake system EPB, ie, after tightening the running CONT shown in Fig. 2 ^¬ ER and SAR evaluation routine for adjusting the force F. First, an actuating force F is generated by means of the electric motor gear unit EGE and the brake mechanism unit BMU is actuated accordingly. The electronic ^¬ cal parking brake system EPB is tightened.

At the same time, in particular the control and training carried out in the processor unit CU values routine SAR, the occurrence of the force F mitigate ^¬ is the events El by the control unit SU - EN monitored. The events El-EN define the causes for a possibly existing reduction of the actuating force F in the vehicle, which may be dependent on predetermined operating characteristics of individual operating elements of the vehicle and / or on other vehicle parameters.

A first event El may be, for example, releasing the brake pedal in the vehicle. A second event E2 concerns the actuation and / or release of the switching module SM for releasing or tightening the electronic parking brake system EPB. Furthermore, as the third event E3, the accelerator pedal can be monitored with the gear engaged, the selected gear selected and the engine running, and the fourth event E4 the release of the accelerator with the gear engaged or the selected gear selected and the engine running. A fifth event E5 can ^¬ at the stopping playing of the motor when the accelerator pedal is actuated and engaged gear or engaged or selected gear. A sixth event E6 constitutes the removal of the gear with the accelerator pedal and engine running, a seventh event E7, a change of vehicle condition, for example, from dynamic to static and vice versa, an eighth event E8, a change in vehicle tilt, and a ninth event E9 a change in the load of the vehicle. Said first through ninth EVENT ^¬ nisse El - E9 may individually or be monitored Ü in combination.

Is determined by the control and evaluation routine SAR of Steuersys ^¬ tems SS the occurrence of at least one of said event ^¬ se El - recognized E9, it is compared via the electronic forward direction EGE generated force F having at least a ^pre-¬ given target force Fset. Here, it is checked in egg ^¬ ner preferred embodiment, by the control and evaluation routine SAR whether the predetermined target force Fsoll is undershot by the current generated force F, the currently acting on the brake mechanism unit BMU force F that is sufficient is, for example, from rolling of the vehicle to prevent. Is the actuator current generated by the electronic parking brake system EPB ^¬ force F sufficient or greater than or equal goes below or bene target force Fset, as is the control and off ^¬ values routine SAR monitoring the occurrence of the event ^¬ se El - E9 again added.

If the currently applied actuating force F falls below the preset setpoint force value Fsetpoint, the

Control and evaluation routine SAR the temporal relationship t (E) between the occurrence of at least one event El - E9 and falling below the at least one predetermined setpoint force Fsoll determined by the generated force F. Exceeds the determined time relationship t (E) a predetermined target time period Tset, the set ^¬ occurred event El - is discarded E9 and generates an error message. A renewed adaptation or retightening of the actuating force In a preferred embodiment, F takes place only after a renewed actuation of the electronic parking brake system EPB.

Falls below the determined temporal relationship t (E) ei ^¬ ne predetermined set time Tset, that is, the present event El - th E9 aufgetre within the target time period Tset ^¬, the force F is of the electronic parking brake ^¬ systems EPB adapted and thus the electronic parking brake System EPB "retensioned" After successful adjustment of the actuating force F, the control and evaluation routine SAR continues to monitor the occurrence of the predetermined events El -E9.

When an erroneous adjustment of the actuating force F within the electronic parking brake system EPB an error message is also generated and the current event El - worfen E9 ^¬ ver. In a preferred embodiment, the error message can be displayed to the driver of the vehicle by means of a display unit. A further adjustment of the actuating force F is again possible, for example, only after a renewed actuation of the electronic parking brake system EPB.

In a preferred embodiment, the predetermined target time period Tsoll is stored in the memory unit MU or is currently determined in each case via the control and evaluation routine SAR. Also, for checking the temporal relationship t (El) -T (E9) of the different events El-E9, respectively different target time periods Tsoll1 - Tsoll9 can be provided, which are also stored in the memory unit MU or respectively currently determined.

Further, the different events El - E9 each one or more predetermined desired force values Fsolll - be associated Fsoll9 in the memory unit MU, which from ^¬ pending loaded from each occurred event El -E9 by the control and evaluation routine SAR and for evaluating the force currently generated F be provided. For example, a cause for a present mini ^¬ mierung the force F may be that in a located on a slope vehicle (seventh event E7), the brake pedal is released (first event El) or the accelerator pedal with the engine running and gear engaged or selected or engaged gear is released (third event E3). The ^¬ se mentioned events El, E3, E7 can cause the vehicle easily rolls back into the brake and thus the force F on the electronic parking brake system EPB is reduced. If this force drop detected by the control system SS within the data stored in memory unit MU ^¬ target time period Tset, the force F is of the electronic parking brake system ^¬ rule EPB by the control system SS automatically adapted.

For example, if the accelerator pedal with the engine running and a gear-laid ^¬ actuated or selected or a drive position (third event E3), so the vehicle runs against the tightened parking brake. In this case, an adjustment of the force F is required. Also, the force F can reduce due to a controlled by the electronic parking brake system EPB braking due to the hereby hervorgeru ^¬ fenen dynamic relief of the brake mechanism unit BMU.

After determining the presence of a falling below of the target force value Fset is the current actuating force F ge ^¬ controlled by the control unit CU adapted executed control and evaluation routine SAR, by increasing either at least to the predetermined desired force Fsoll or the each occurred event El - E9 zugeord ^¬ designated target force Fsolll - Fsoll9.

The predetermined setpoint force Fsolll - Fsoll9 can in a preferred embodiment of additional environmental conditions of the vehicle, which are also determined and evaluated by the control and evaluation routine SR dependent be. Such environmental conditions of the vehicle may be, for example, the inclination, load, the tire pressure, the ambient temperature, the wear and / or the aging or change of the electronic parking brake system EPB or its units.

After a successful adaptation of the actuating force F, the control system SS is put into a kind of "standby mode", in which the presence of at least one event El-E9 which reduces the actuating force F is monitored.

The invention has been described above by means of an embodiment. It is understood that numerous changes and modifications are possible without departing from the idea underlying the invention.

LIST OF REFERENCE NUMBERS

BBM brake pad module BMU brake mechanism unit

BTM brake drum module

CU processor unit

E event

El - E9 first to ninth event EBP electronic parking brake system

EGE electric motor gear unit

F power

Setpoint setpoint

Fsolll - Fsoll9 different setpoint forces MU memory unit

R wheels

SS control signal

SW switching signal

SAR control and evaluation routine SM switching module

SS control system

SU control unit

SZS pulley system t (E) temporal correlation t (El) - t (E9) different temporal relationships

Tsoll target time

Tsolll - Tsoll9 different target time periods

Claims

claims

1. A control system for adjusting a provided for controlling a brake sen- sor unit (BMU) actuating force (F), in which an electronic device (EGE) for generating the actuating force (F) is provided in a vehicle controllable via a control unit (SU) is characterized in that the control unit (SU) for monitoring the occurrence of the force generated (F) reducing eVENT ^¬ Nisses at least (El - E9) is arranged, wherein upon the occurrence of at ^¬ least one of the events (El - E9) the generated actuating force (F) with at least one predetermined setpoint force (Fsoll) is compared and depending on the result of the comparison by the control unit (SU) a control signal (ss) is generated, which for adjusting the actuating force (F) to the electronic Vor ^¬ direction (EGE) is controlled.

2. Control system according to claim 1, characterized in that when falling below the at least one predetermined Sollstellkraft (Fsoll) by the generated force (F) by the electronic device (EGE) generated actuating ^¬ force (F) is adjusted.

3. Control system according to claim 1 or 2, characterized in that for adjusting the adjusting force (F) by the electro ^¬ African device (EPB) generated force (F) is increased, and while until it at least with the predetermined setpoint force (Fsoll ) matches.

4. Control system according to claim 3, characterized in that as an event (El -E9) the release of the brake pedal in Fahr ^¬ zeug, the actuation or release of a switching module (SM) for releasing or tightening the electronic parking brake system (EPB), the pressing the accelerator pedal when gear is engaged or engaged or selected gear and running engine, the release of the accelerator pedal with gear engaged or engaged or selected gear and running engine, stopping the engine with the accelerator pedal and gear engaged or engaged or selected gear, the removal of the

Ganges or the gear with the accelerator pedal and running ^¬ the engine, a change of the vehicle state of dynamic in static or vice versa, a change in the vehicle inclination and / or a change in the load of the vehicle to be monitored.

5. Control system according to claim 4, characterized in that the events (El - E9) are monitored individually or in combination.

6. Control system according to one of claims 2 to 5, characterized in that the temporal relationship (t (E)) between the occurrence of at least one event (E) and the undershooting of the at least one predetermined setpoint force (Fsoll) by the generated force (F ) is determined.

7. Control system according to claim 6, characterized in that the temporal relationship (t (E)) is compared with a predetermined target time duration (Tset) and the adjusting force (F) is adjusted as a function of the comparison result.

8. Control system according to one of claims 1 to 7, characterized in that when exceeding the predetermined target period of time

(Tsoll) an error message is generated by the determined temporal relationship (t (E)).

9. Control system according to one of claims 1 to 8, characterized that a successful adjustment of the actuating force (F) is checked by the control unit (SU).

10. Control system according to one of claims 1 to 9, characterized gekennz egg chnet that determined by the control unit (SU) the force (F) in ^¬ influencing environmental parameters evaluated and from ^¬ depending on the adjusting force (F) is adjusted.

11. Control system according to claim 10, characterized egg-chnet that as ambient conditions, the inclination, the load, the tire pressure, the ambient temperature, the wear and / or aging of the electronic parking brake system (EPB) or its units are determined.

12. Control system according to one of claims 7 to 11, characterized in that different setpoint forces (Fsolll - Fsoll9) and / or different setpoint periods (Tsolll - Tsoll9) are assigned to different events (El - E9).

13. Control system according to one of claims 1 to 12, characterized in that the electronic device is designed as an electric motor transmission unit (EGE).

14. Control system according to one of claims 1 to 13, characterized in that the control unit (SU) and the electronic device (EGE) form an electronic parking brake system (EPB).