DE102006059529B3 - Vehicle i.e. motor vehicle, system controlling method, involves detecting stand state of vehicle, when actual drive state presents, and all amounts of speed of movements are identically zero or motor does not run, and preset time is expired - Google Patents

Abstract

The method involves detecting a vehicle state such as drive, when an actual vehicle state such as stand presents. The drive state of the vehicle is detected, when final stages of controlled vehicle system are activated, and one of amounts of speeds of vehicle movements is larger than a threshold value, and when the motor runs. The stand state of the vehicle is detected, when the actual drive state presents, and all amounts of the speed of the movements are identically zero or the motor does not run, and a preset time is expired. An independent claim is also included for a circuit arrangement for detecting a vehicle system.

Description

The The invention relates to a method for controlling a vehicle system, in particular a provided with air spring and damper units level control system a vehicle, the transition between the vehicle states "state" and "travel" in both directions of transition is detected by the evaluation of the signals from sensors for dynamic Movements of the vehicle and the evaluation of static state parameters of the vehicle Vehicle, wherein for detecting the vehicle states "state" and "driving" the driving speed of the vehicle, the speeds of vehicle movements and engine running determined and related to each other and evaluated. Furthermore, the invention relates to a circuit arrangement for carrying out the Process.

Such methods also known as standstill detection or driving state recognition are known in vehicle regulations, in particular in the case of brake system regulations or in antilock braking systems. So revealed the DE 198 38 885 A1 a method and a device for ensuring the stoppage of a vehicle, in which / which is detected at a standstill, inter alia, a parking brake. Provided is a standstill detection that also processes input signals that are supplied via lines in addition to the speed signals of the vehicle. Underneath there is at least one signal representing a start request. The lines come from measuring devices that determine various operating variables of the vehicle via sensors, such as steering angle, lateral acceleration, etc.

The WO 02/42132 A1 discloses a method and a device for detecting a stationary state of a motor vehicle, in which, regardless of the operation of a central control of the standstill of a vehicle is detected by a change in position. A current change of position parameter is compared with a (previously) determined change of position parameter. At least one change in inclination about the longitudinal and / or transverse axis of the vehicle is understood as "change in position." In particular, the description of the exemplary embodiments given there refers to a prior art which includes the evaluation of several typical dynamic movements of a vehicle for stationary determination It should also be noted that these dynamic movements are distinguishable depending on the type of motor vehicle.

The WO 02/49893 A1 discloses a method and system for controlling a brake equipment that can be activated when the vehicle is at a standstill, in which the stoppage of a vehicle is detected by detecting vehicle movements / inclinations and comparing them with those vehicle movements that typically occur when driving a vehicle. If a lack of such typical movements is detected, a standstill is concluded.

The DE 36 18 532 A1 discloses a traction aid for a vehicle for starting on a slope, in which inter alia, a standstill of the vehicle is determined by the driving speed, clutch signals, circuit settings and inclination angle of the vehicle are assessed. If it detects a stoppage of a motor vehicle, a brake actuation pressure is maintained via corresponding valves.

Alles however, these methods or systems have shortcomings as disadvantages the statement security or in the uniqueness of the recognition of Vehicle states "ride" or "stand" on, so that for the invention the task consisted of this unambiguousness and statement assurance improve.

Is solved this task by the features of the main claim. Further advantageous Formations are disclosed in the subclaims 2 to 5. Also discloses a circuit arrangement according to the invention for detecting vehicle conditions.

• a) eine Erkennung des Fahrzeugzustandes „Fahrt" erfolgt, wenn i) der aktuelle Fahrzeugzustand „Stand" vorliegt, und ii) Endstufen des zu steuernden Fahrzeugsystems eingeschaltet sind und der Steuerungsschaltkreis fehlerfrei ist, und iii) einer der Beträge der Geschwindigkeiten der Fahrzeugsbewegungen größer als ein Schwellwert ist, und iv) der Motor läuft,
• b) und dass eine Erkennung des Fahrzeugzustandes „Stand" erfolgt, wenn i) der aktuelle Fahrzeugzustand „Fahrt" vorliegt, und ii) alle Beträge der Geschwindigkeiten der Fahrzeugsbewegungen identisch Null sind oder der Motor nicht läuft, und iii) eine vorbestimmte Zeit abgelaufen ist.

In this case, to detect the vehicle states "state" and "driving", the driving speed of the vehicle, the speeds of vehicle movements and the engine run are determined / detected and correlated and evaluated

• a) a recognition of the vehicle state "driving" takes place if i) the current vehicle state "state" is present, and ii) power amplifiers of the vehicle system to be controlled are switched on and the control circuit is faultless, and iii) one of the amounts of the vehicle movement speeds greater than is a threshold, and iv) the engine is running,
• b) and that a detection of the vehicle state "state" takes place when i) the current vehicle state "ride" is present, and ii) all amounts of the vehicle movement speeds are identically zero or the engine is not running, and iii) a predetermined time has elapsed ,

Only such an evaluation of the speeds of vehicle movements, ie the Changes in the time of the essential vehicle movements in conjunction with a statement about the engine running lead to a safe determination of the states "ride" and "state", the misinterpretations when transporting the vehicle on means of transport such as trucks or ships, when towing a vehicle when lifting Lifting platforms, etc. prevented.

A advantageous development in just this sense is that in addition to the driving speed of the vehicle as another essential Speeds of vehicle movements the pitching speed, the roll speed and the lifting speed of the vehicle or vehicle parts are determined and evaluated.

A Another advantageous development is that as vehicle movements Body or body movements and / or chassis movements, So also about movements of unsprung masses, wheels etc. be determined and evaluated. This can be a very simple one Way by the utilization of signals possibly already existing Sensors, such as Radbeschleunigungssignale or height sensor signals are performed.

A Such advantageous in the sense of the use of existing sensors Continuing education is that the driving speed of the vehicle by usually for the brake control already existing Radrehzahlsensoren determined becomes.

A Another advantageous development is that between the detection of the vehicle state "state" and the corresponding signal output to the vehicle system a switching delay i. a turn-off delay for one influenced system control is provided. This is at one Control system / a regulation, for example in an air spring control, a jumping back and forth of the scheme when swinging vehicle movements prevented.

The inventive method and the objective execution a circuit arrangement according to the invention is based on an embodiment be explained in more detail.

The 1 shows a circuit arrangement for this purpose 1 for detecting vehicle conditions for carrying out the method according to the invention. The circuit arrangement has two main branches 2 and 3 of which one, namely the main branch 2 for detecting the vehicle state "ride" and the other main branch 3 for detecting the vehicle condition "Stand" is used.

The main branch used to determine the vehicle condition "drive" 2 initially consists of a comparator 4 for a signal value of the pitching speed, from a comparator 5 for a signal value of the roll speed and from a comparator 6 for a signal value of the lifting speed. The respective current signal values for the pitching speed, the roll speed and the lifting speed become the comparators 4 . 5 and 6 through the sensors connected to corresponding sensors 7 . 8th and 9 fed, the sensors are not shown here. The comparators 4 . 5 and 6 are also corresponding memory 10 . 11 and 12 associated with thresholds / thresholds, based on which the respective comparator checks the current respective signal value and provides an output signal when the threshold is exceeded.

The circuit arrangement 1 also includes a comparator 13 for a signal value of the driving speed. Again, the comparator 13 a memory 14 associated with a threshold for the speed, the comparator 13 the respective signal value of the signal generator 15 is compared with the threshold for the vehicle speed and provides an output signal when the signal value exceeds the threshold value. The signal generator 15 processes here the speed signals provided by the corresponding but not shown wheel speed sensors.

Furthermore, the circuit arrangement 1 a first logical operator 16 on, the output signals of the comparators 4 . 5 and 6 in an "OR" check for their presence and, if present, an output to a second logic operator 17 outputs. The second logical operator 17 checks the output signal of the first logic operator 16 and the output signal "motor is running" of a signal generator 18 , which is connected to a sensor not shown here for the engine running, in an "AND" -Vukeup on their presence and, if present, an output signal to a third logic operator 19 out.

The third logical operator 19 checks the output signal of the second logic operator 17 and the output of the comparator 13 in an "OR" link on their presence and outputs in the presence of an output signal, in which therefore all essential the vehicle condition "ride" characterizing features are checked.

The main branch serving to determine the vehicle status "Stand" 3 exists, similar to the main branch 2 , from a comparator 20 for a signal value of the pitching speed, from a comparator 21 for a signal value of the roll speed and from a comparator 22 for a signal value of the lifting speed.

The respective current signal values for the pitching speed, the roll speed and the lifting speed become the comparators 20 . 21 and 22 by the already mentioned above and associated sensors with corresponding sensors 7 . 8th and 9 fed. The comparators 20 . 21 and 22 are also corresponding memory 23 . 24 and 25 associated with a 0 value as a threshold on the basis of which the respective comparator 20 . 21 . 22 checks the current respective signal value and in this case / in this main branch provides an output signal with identity of the respective current signal value with the 0 value.

The main branch 3 has another comparator 26 for the signal value of the driving speed. Again, the comparator 26 again a memory 27 associated with a 0 value for the speed. The comparator 26 checks the respective signal value of the signal generator 15 for driving speed to identity with the zero value and provide an output signal if there is identity, ie if the signal value is equal to zero.

The main branch 3 also includes a fourth logic operator 28 that outputs the output signals of the comparators 20 . 21 and 22 in an "AND" link checks for their presence and, if present, an output to a fifth logic operator 29 outputs.

The fifth logical operator 29 checks the output signal of the fourth logic operator 28 and the output signal "motor is stopped", ie the "NOT" signal or "motor is not running signal" of the above-mentioned signal generator 18 in an "OR" -link to their presence and, if present, gives an output to a sixth logic operator 30 out.

The sixth logical operator 30 checks the output signal of the fifth logic operator 29 and the output of the comparator 26 in an " AND " link for their presence and, when present, outputs an output signal which includes all essential features characterizing the vehicle state " state ".

The output signals of the third logic operator 19 and the sixth logical operator 30 as output signals of the two main branches are in a switching element 31 merged and become a signal 32 for the vehicle state "ride" or to a signal 33 for the vehicle state "state" to be transformed, the state signal first a time delay circuit not shown here 34 starts and after expiration of the delay time as "Stand" signal 33 is fed into the system control.

The function of the circuit arrangement or of the method for recognizing the state "drive" is clarified again below in the form of logic checks (true / false):
It was assumed that neither a driving speed nor a Aufaufwegung (lifting, nodding or rolling) is present.

If the driving speed is increased above 0 km / h, then comparator performs 13 the logical operator 19 a "true", so that this designed as a setter / resetting switching element 31 operated, ie there the output Q occupied, which is recognized to ride.

If, on the other hand, the driving speed is not above 0, that is, the vehicle is at a standstill, so is via comparators 13 a "wrong" to logic operator 19 given. But now moves the structure, so either a lifting, pitching or rolling speed is detected, which is above the threshold, this leads to the corresponding comparator 4 . 5 and 6 and about the logic operator 16 to set a "true" on the logic operator 17 , If it is also detected at the same time as running, logic operator links 17 the two input information to a "true" logic operator 19 , The switching element 31 This means that the setter / resetter is actuated (output Q) and "travel" is detected.The linking of the body movement with the engine run ensures that, when the ignition is switched on and the engine is switched off, the dampers of a level control system are not energized when the structure moves due to external stimuli (transport, loading ...).

The function of the circuit arrangement or of the method for detecting the state "state" takes place as illustrated below:
If the driver has previously detected the "Drive" status, the vehicle changes to the "Stand" status when the comparator 26 due to the non-existent driving speed to standstill recognizes and (logic operator 30 ) if no Aufwegweg is detected or the engine stops running. The absence of a body movement is via the comparator 21 for the wavering, over comparator 20 for nodding and over comparators 22 noted for lifting. Only when all three comparators "true" to the input of the logic operator 29 can give in connection with the driving speed of the input R of the setter / resetter (switching element 31 ).

However, the state "state" is not set immediately when conditions are met, but is over a turn-off delay circuit 34 bounced. This prevents a jumping back and forth of the standstill regulator, for example, in the event of swinging vehicle movements.

1

circuitry

2

Main branch: Detection "Ride"

3

Main branch: Detection "Stand"

4-6

comparator

7-9

signaler

10-12

Storage

13

comparator

14

Storage

15

signaler

16

first logic operator

17

second logic operator

18

signaler

19

third logic operator

20-22

comparator

23-25

Storage

26

comparator

27

Storage

28

fourth logic operator

29

Fifth logic operator

30

six logic operator

31

switching element

32

Output signal: Driving condition "Ride"

33

Output signal: Driving condition "Stand"

34

Time delay circuit

Claims (6)

A method for controlling a vehicle system of a vehicle, wherein the transition between the vehicle states "state" and "driving" in both directions of transition is detected by the evaluation of the signals from sensors for dynamic movements of the vehicle and the evaluation of static state parameters of the vehicle, wherein for detection the vehicle states "state" and "driving", the driving speed of the vehicle, the speeds of vehicle movements and the engine run are determined and compared with one another and evaluated, characterized in that a) a recognition of the vehicle state "ride" takes place, if i) the current vehicle state "state" is present, and ii) amplifiers of the vehicle system to be controlled are switched on and the control circuit is faultless, and iii) one of the amounts of the vehicle movement speeds is greater than a threshold value, and iv) the engine is running, b) and a detection the vehicle state "state" occurs when i) the current vehicle state "ride" is present, and ii) all amounts of the vehicle movement speeds are identically zero or the engine is not running, and iii) a predetermined time has elapsed. Method according to claim 1, characterized in that that as velocities of vehicle movements the pitching speed, the roll speed and the lifting speed of the vehicle or of vehicle parts are determined and evaluated. Method according to claim 1 or 2, characterized that as vehicle movements body or body movements and / or Chassis movements are determined and evaluated. Process according to claims 1 to 3, characterized that determines the driving speed of the vehicle based on wheel speed sensors becomes. Process according to claims 1 to 4, characterized that between the detection of the vehicle state "state" and the corresponding Signal delivery to the vehicle system a time delay is provided. Circuit arrangement ( 1 ) for detecting vehicle conditions for carrying out the method according to claims 1 to 5, characterized in that the circuit has two main branches ( 2 . 3 ), one of which is used for detecting the vehicle state "state" and the other for detecting the vehicle state "driving", wherein a) serving to determine the vehicle state "ride" main branch ( 2 ) consists of (i) one comparator each ( 4 . 5 . 6 ) for a signal value of the pitching speed of the vehicle, the roll speed of the vehicle and the lifting speed of the vehicle, the respective signal value with a corresponding threshold ( 10 . 11 . 12 ) for the pitching speed of the vehicle, the rolling speed of the vehicle and the lifting speed of the vehicle and provides an output signal when the signal value exceeds the threshold value, ii) a comparator ( 13 ) for the signal value of the driving speed of the vehicle, the respective signal value with a corresponding threshold ( 14 ) for the vehicle speed and provides an output signal when the signal value exceeds the threshold, iii) a first logical operator ( 16 ), which compares the output signals of the comparators ( 4 . 5 . 6 ) checks for the pitch, roll and lift speed in an "OR" link for their presence and, if present, outputs an output signal, iv) a second logic operator ( 17 ), which receives the output signal of the first logic operator ( 16 ) and the Output signal "Motor running" of a signal generator ( 18 ) for the engine run in an "AND" -connection checks for its presence and outputs an output signal if present, v) a third logical operator ( 19 ), which receives the output signal of the second logic operator ( 17 ) and the output signal of the comparator ( 13 ) checks for the driving speed in an "OR" link for their presence and outputs an output signal if present, b) of the main vehicle used to determine the vehicle state "state" ( 3 ) consists of (i) one comparator each ( 20 . 21 . 22 ) for a signal value of the pitching speed of the vehicle, the roll speed of the vehicle and the lifting speed of the vehicle, the respective signal value with a zero value ( 23 . 24 . 25 ) for the pitching speed of the vehicle, comparing the roll speed of the vehicle and the lifting speed of the vehicle and providing an output signal when the signal value is equal to zero, ii) a comparator ( 26 ) for the signal value of the driving speed of the vehicle, which outputs the respective signal value with a zero value ( 27 ) compares the vehicle speed and provides an output signal when the signal value equals zero, iii) a fourth logical operator ( 28 ), which compares the output signals of the comparators ( 20 . 21 . 22 ) checks for the pitch, roll and lift speed in an "AND" link and, if present, outputs an output signal, iv) a fifth logic operator ( 29 ), which receives the output signal of the fourth logic operator ( 28 ) and the output signal "motor is stopped" of the sensor ( 18 ) checks for the presence of an "OR" link for the engine run and, if present, outputs an output signal, v) a sixth logic operator ( 30 ), which receives the output signal of the fifth logic operator ( 29 ) and the output signal of the comparator ( 26 ) checks for the driving speed in an "AND" link and, if present, outputs an output signal, wherein c) the output signals of the third and sixth logic operators ( 19 . 30 ) as outputs of the two main branches ( 2 . 3 ) in a comparator ( 31 ) and to a signal ( 32 . 33 ) for the vehicle state "ride" or "stand", wherein the state signal is first a time delay element ( 34 ) and after expiration of the delay time as a "stand" signal ( 33 ) is fed into the system control.