The invention relates to a method for releasing a door brake system according to the preamble
of claim 1
Door brake systems have long been known in the automotive industry. The US Pat. No. 2,032,600 A
describes a mechanical door brake system. Only after overcoming a conditional by the construction of the braking or locking device minimum force, the door can be moved back from the locked position. The disadvantage here is that the door brake system can not distinguish whether it is a deliberate or unwanted door movement.
From the DE 35 19 203 C2
a door check is known, which has hydraulic means for continuously locking the pivoting position. In this system, the door brake releases when the inside or outside door handle is actuated. A simple throwing the vehicle door is not possible.
From the DE 42 29 412 C1
is a method for determining the braking force of a door hinge axis rotatably mounted motor vehicle door known. Here, the braking force is detected for detecting the vehicle door in response to the door angular velocity. If the door angular velocity is greater than at least almost zero, it is concluded that a door operation has not yet been completed. If the value of the door angular velocity approaches zero, a braking force is exerted. The braking force is activated when the absolute value of the door angular velocity approaches zero. The electric door brake is released when the force acting on the vehicle door has exceeded a predetermined safety braking force. Also in this case, only the absolute value of the force acting on the vehicle door force is taken into account.
From the DE 94 11 777 U1
a control for a stepless door check is known in which the state of motion of the vehicle door is detected. The door brake system is released as soon as the speed of the door movement exceeds a predetermined value.
The invention is a simple method for releasing an electric door brake system
indicate that between a wanted and unwanted door movement
The object is achieved by a
Method according to claim 1 solved. Advantageous developments
are the objects
an electric door brake system,
which is a vehicle door
in an open one
Holds position, draws
characterized by being dependent
from the time course of a force signal on the vehicle door, the door brake system
The time course of the force signal on the vehicle door is different in a desired door movement as in an unwanted door movement. A desired door movement is usually caused by a person, an unwanted door movement is caused, for example, by wind or a strong inclination of the road. In the case of a desired door movement, the amplitude of the force signal increases very rapidly over time, whereas in contrast, in the event of an unwanted door movement, the amplitude of the force signal changes only slowly over time. This distinguishing feature is suitable to detect a desired door movement and accordingly to solve the electric door brake system. In the evaluation of the time course is in contrast to an absolute value evaluation, as for example. In the DE 42 29 412 C1
is described, a faster distinction between intentional and unwanted door movement possible.
the temporal course of the speed signal and the temporal
Course of the acceleration signal, which are not the subject of the invention,
show the already mentioned differences in wanted or unwanted
on. This is a quick and easy distinction between
a wanted or unwanted door movement possible.
Time course of the force signal can be evaluated in various ways
become. Advantageously, with a gradient of the force signal,
which exceeds a force limit,
the electric door brake system
Based on the gradient can be easily determined whether it is a deliberate or unwanted door movement. In a desired door movement by a person undergoes the vehicle door at the beginning z. As a rapidly increasing acceleration, which also quickly becomes smaller again, until it goes to zero. In the case of an unwanted door movement, for example due to the wind, the door experiences a relatively slowly increasing acceleration. If the gradient of the acceleration signal exceeds a predetermined acceleration limit value, it can be assumed with very high probability that it is a deliberate door movement by a person delt. The same applies to the speed signal and the force signal underlying the invention or for their gradients.
becomes the force limit dependent
from an opening angle
the door and / or
given an inclination angle of the vehicle, as, for example, at a
almost closed door
and a deliberate movement of the door of the acceleration waveform
can look different than with a nearly completely open door and a deliberate movement.
Even at different angles of inclination of the vehicle due
the road inclination
the time profile of the force signal can be different.
The for determining the opening angle
necessary sensors are in electromechanical door brakes
usually already in the vehicle, resulting in no additional costs
attack. Most vehicles also have tilt angle sensors.
a gradient evaluation can also be an evaluation of two amplitude values,
recorded at a different but fixed time
of the electric door brake system
made by the time course of the force signal is advantageously a
Force sensor used, which is mounted near the door brake actuator
Combining the evaluation of a time course of the movement
characterizing the vehicle door
Signal with the evaluation of the time course of the force signal
is also possible
and offers the advantage of a very accurate
and safe distinction between wanted and unwanted door movement.
the drawing is an embodiment of
Invention shown. It shows
1 a combination of the evaluation of the time profile of the signal characterizing the movement of the vehicle door with the evaluation of the time profile of the force signal on which the invention is based,
2 two temporal courses of an acceleration signal and
3 two temporal courses of a force signal.
The 1 shows a schematic flow diagram of a combination of the evaluation of the time course of the movement of the vehicle door characterizing signal with the invention underlying evaluation of the time course of the force signal to release an electric door brake system, which holds a vehicle door in an open position. The electric door brake system is released depending on the time course of an acceleration signal BS or a speed signal GS or according to the invention of the time course of a force signal KS. The acceleration signal BS or the speed signal GS is calculated, for example, from a path signal WS by a one-time time derivative d / dt or by a time derivation d / dt · d / dt twice. The displacement sensor which supplies the path signal WS is installed in the vicinity of the vehicle door pivot point. The force signal KS is determined, for example, by means of a force sensor.
Acceleration signal BS and the speed signal GS is
in a first gradient unit G1, the gradient of the acceleration signal
BSG or the gradient of the speed signal GSG calculated.
From the force signal KS we in a second gradient G2 the
Gradient of the force signal KSG calculated.
in a first limit decision gwb / gwg checks whether the gradient of the acceleration signal
BSG an acceleration limit GWB or the gradient of the speed signal
GSG exceeds a speed limit GWG. Likewise, in one
second limit decision gwk checks whether, the gradient of the force signal
KSG exceeds a force limit GWK.
The acceleration limit GWB, the speed limit
GWG and the force limit value GWK is dependent on a control unit SG
an opening angle ÖW the door and / or
an inclination angle NW of the vehicle specified.
an OR gate OR is then a signal S to release the
electric door brake system
emitted when either the gradient of the acceleration signal
BSG the acceleration limit GWB or the gradient of the speed signal
GSG the speed limit GWG or - according to the invention - the gradient
of the force sensor KSG has exceeded the force limit value GWK (= j). Instead of
OR gates OR would be
also an AND gate AND suitable.
2 shows two temporal courses of an acceleration signal, over the time t, the acceleration B is plotted.
The acceleration signal BS-N represents a possible signal course which occurs when a user wishes to move the door could. At the beginning, ie at the time t 0 , the acceleration B increases very rapidly to a maximum. Subsequently, the acceleration B is again reduced very rapidly in the case of the acceleration signal BS-N caused by the user until the acceleration B decays slowly from a time t 0 + Δt 1 .
In contrast, the acceleration signal BS-W makes a possible
Waveform is the case of an unwanted door movement, the example. By
Wind or the inclination of the vehicle is generated, could occur. in this connection
acceleration B only increases very slowly.
To evaluate the time course, either the gradient of the acceleration signal BS-N or BS-W can be used. From the 2 It can be seen that the gradient of the acceleration signal BS-N from the user assumes a substantially greater value than the gradient of the acceleration signal BS-W from the wind.
3 shows two temporal courses of a force signal, over the time t, the force acting on the vehicle door force F is plotted.
The force signal KS-N represents a possible signal curve that could occur when a user wishes to move the door. At the beginning, that is to say at the instant t 0 , the force F increases very rapidly up to a maximum. Subsequently, the force F is again reduced very rapidly in the force signal KS-N caused by the user until the force F slowly decays from a time t 0 + Δt 1 . In contrast, the force signal KS-W is a possible waveform that could occur in an unwanted door movement, for example, generated by wind or the inclination of the vehicle. Here, the force F increases only very slowly.
Can also be used in conjunction with other vehicle systems
become. So it makes sense, for example, that the process also an unwanted
the z. B. is triggered by a thief, recognizes, and accordingly
the electric door brake
is not solved.
Here is the electric door brake system
coupled with an anti-theft alarm system. Is the theft alarm system
Active, the electric door brake system can not
the system for the
when an accident, for example, is detected by means of a crash sensor.
If this is the case, the electric door brake system should be easy to solve
or solve themselves automatically.
a variety of other details quite different from the above description
be designed without departing from the content of the claims.