EP0111821B1 - Prüfvorrichtung für Kraftfahrzeugs-Funktionselemente - Google Patents

Prüfvorrichtung für Kraftfahrzeugs-Funktionselemente Download PDF

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Publication number
EP0111821B1
EP0111821B1 EP83112226A EP83112226A EP0111821B1 EP 0111821 B1 EP0111821 B1 EP 0111821B1 EP 83112226 A EP83112226 A EP 83112226A EP 83112226 A EP83112226 A EP 83112226A EP 0111821 B1 EP0111821 B1 EP 0111821B1
Authority
EP
European Patent Office
Prior art keywords
variation
testing device
function elements
change
functional elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83112226A
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German (de)
English (en)
French (fr)
Other versions
EP0111821A1 (de
Inventor
Wolfgang Peter Flohr
Fritz Bourauel
Walter Weishaupt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0111821A1 publication Critical patent/EP0111821A1/de
Application granted granted Critical
Publication of EP0111821B1 publication Critical patent/EP0111821B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
    • G07C5/0808—Diagnosing performance data

Definitions

  • the invention relates to a test device for motor vehicle functional elements that change compared to an initial state and trigger a common display device when an individual limit state is reached.
  • the most well-known test device of this type is the so-called brake pad wear indicator, in which a limit state is usually indicated in the form of brake pad wear down to a minimum pad thickness by switching on a single warning lamp. With the help of the warning lamp, several brake pads can be monitored and the wear indicator can be triggered by the first pad that reaches its limit state. As a rule, all brake linings of the motor vehicle are then replaced.
  • the invention has for its object to provide a test device of the type mentioned, through which the change behavior or the state of in particular different functional elements can be checked before reaching the respective limit state in a clear manner.
  • the invention solves this problem in that the changes in the functional elements each form an equal number of change intervals which adjoin one another and extend to the respective limit state, in that a further display device is assigned to the equivalent change intervals of the functional elements and that that functional element is the respective one Triggers display device that first reaches the limit of its change interval.
  • the changes to the functional elements can be the wear of the functional elements.
  • a clutch pad can also be checked.
  • the quality of a lubricant or operating medium of the motor vehicle or its internal combustion engine can also be taken into account.
  • changes in the performance of components such as an air filter due to increasing pollution can be taken into account.
  • the test device itself can be used as part of a service interval display device for signaling maintenance work to be carried out to the vehicle user or in workshops to check the status of the functional elements.
  • the functional element that changes the most until the limits of the change intervals are reached is controlled by the respective display device. It may happen that the display devices are triggered by different functional elements of the scope of testing in accordance with the change behavior of the functional elements, since each display device can be triggered by each of the functional elements.
  • a service interval display device for motor vehicles in which a target path is divided into several target path intervals of the same size and each of these intervals is assigned its own signal element, which is at the end of the interval Switching state changes.
  • the present invention differs in that the functional elements themselves control the display devices.
  • this is an indirect and only general consideration of the change behavior of the individual functional elements.
  • the different functional elements have an equal number of e.g. assigned to four display devices.
  • the scope of changes of the functional elements taken into account is divided into a number of change intervals that is the same as the number of display devices.
  • the scope of change can be the entire change from the initial to the limit state or only a part that changes with the limit state. As a result, uncritical initial changes can be disregarded for the life of the functional element.
  • the change intervals of each functional element can be different in size or the same as each other.
  • a particularly meaningful display can also be obtained if the changes are related to a change-influencing parameter.
  • a change-influencing parameter can be chosen the same for the functional elements.
  • Such a parameter can be the distance traveled or the number of operating hours.
  • the parameters can also be different, for example the influencing variables that are decisive for the change. As in the case of the known brake pad wear indicator with a good approximation, this can again be the distance covered. Further possibilities are the load or usage scope of the functional element.
  • Measured variables for this can be the total fuel consumption quantity specified in DE-A No. 3104174, the distance assessed according to the engine load in accordance with DE-A No. 3104196, the total number of operating hours, etc., or combinations of these influencing variables.
  • non-linear relationships between the change and the parameter influencing the change can be taken into account accordingly, so that even with such non-linearities, a reliable statement about the expected durability of the functional elements can be obtained at all times.
  • test device there is a particularly effective display by luminous elements as display devices. These can be switched so that they are switched off when triggered. As part of a service interval display device, the display devices that have not yet been triggered can be switched on when the motor vehicle is started up and can be switched off immediately afterwards, for example with the aid of the standard oil pressure control switch.
  • the functional elements change further after the warning display device has been triggered, the functional elements can switch on further warning display devices, the change of which, as the first, exceeds the overdraft intervals above the limit value. This makes the need to check the motor vehicle particularly clear.
  • This checking can be carried out, for example, in such a way that the relevant or reached change interval of the individual components can be read out individually. This gives a list of the change behavior of the functional elements measured in stages. A further help results from the fact that the naming of the functional elements lying within the respective change intervals can also be read out during such a check.
  • a further relief is obtained if only the functional elements can be read out with regard to their designation and / or with regard to their relevant change interval, the change of which has reached a predetermined level.
  • the measure can be half of the total change. If one assumes that, after the check, at least the functional element that has reached its limit state is returned to the initial state, it can be assumed with some certainty that the non-readable functional elements last until the functional state of this functional element is reached again.
  • the predetermined measure for the change can also be three quarters of the total change. All functional elements, the change of which has exceeded this dimension, are expediently also replaced or returned to the original initial state.
  • the required service can also be determined by an additional measure.
  • the functional elements or at least groups thereof e.g. procured by suitable choice of material in such a way that they have a coordinated, as it were synchronous change behavior - the change intervals for these functional elements are run through synchronously on average - then the change behavior of one of these functional elements can be used to infer that of the other functional elements (of this group).
  • the functional elements almost simultaneously reach the limit state or preceding change marks, expediently identical with the limits of the change intervals.
  • the changes in the functional elements can be compared with predetermined change curves before they are assigned to the display devices.
  • an error display can then be triggered without actuation of the functional elements. The remaining functional elements are still checked using the display devices.
  • the functional elements can be all parts or equipment that experience a change in their properties due to their service life and / or stress. These include, for example, the so-called wear parts such as brake and clutch lining, operating fluids such as brake and coolant or engine and transmission oil, as well as closed systems and their parts, such as an air conditioning system and its essential components, the properties or performance of which can usually only change in exceptional cases.
  • wear parts such as brake and clutch lining
  • operating fluids such as brake and coolant or engine and transmission oil
  • closed systems and their parts such as an air conditioning system and its essential components, the properties or performance of which can usually only change in exceptional cases.
  • These functional elements are checked together or in the form of a selected group with the help of only a few (here: four) LEDs L1 to L4.
  • individual sensors are assigned to the functional elements, which reproduce the properties of the functional elements continuously or quasi-continuously in a number of stages corresponding to the number of light-emitting diodes.
  • the sensors are shown schematically as resistors 1 to 3 for four such functional elements, not specified.
  • the resistors 1 to 3 change their resistance value in accordance with the change in the functional elements continuously from a predetermined output value to a predetermined final value.
  • the resistance can be a resistance body which is integrated in the brake pad and is reduced in accordance with the wear of the brake pad and also reduces its resistance value.
  • the functional element is, for example, an air filter, the property of which is determined in a known manner with the aid of the differential pressure
  • the resistance can be, for example, a piezo element which is subjected to the differential pressure.
  • a measuring point switch 5 Downstream of the resistors 1 to 3 is a measuring point switch 5, which is controlled by a driver 6 and to which a comparator 7 is connected.
  • the driver 6 also controls a memory 8, which is also connected to the comparator 7.
  • further light-emitting diodes 9 to 11 are connected to the outputs of the comparator 7, of which the light-emitting diodes L1 to L4 have a uniform, e.g. have green colors and the LEDs 9 to 11 are different colors.
  • the light-emitting diode 9 is connected via an inverter 4 and a flip-flop F5 to the output of the comparator 7 for the light-emitting diode L4.
  • Alphanumeric display devices 12 to 14 are also connected to the outputs of the comparator 7 for the light-emitting diodes L2 to L4.
  • the driver 6 also controls, via an arbitrarily actuated switch 15, a naming transmitter 17, the output of which is led to the playback devices 12 to 14.
  • the memory 8 contains resistance values belonging to each of the resistors 1 to 3, which corresponds to the number of light-emitting diodes L1 to L4, ie four in the example shown. These resistance values are selected in accordance with the change behavior of the functional elements in such a way that they correspond to the same intervals of the considered parameter influencing the change in the functional element. If this parameter is, for example, the distance traveled and if, as shown in the left-hand image in FIG. 2, the relationship between the change in the associated resistance and the distance traveled is linear, then the interval-determining resistance values contained in the memory 8 are also proportional to one another.
  • the LEDs L1 to L4 are switched off one after the other when the resistance value changes by 25% of the difference R a - R e . Due to the linear relationship, this happens after covering a quarter of the total distance from here 30,000 km.
  • the measuring point switch 5 and the memory 8 are clocked, controlled by the driver 6.
  • the measuring point switch 5 cyclically polls the resistors 1 to 3 belonging to the functional elements and switches these resistors one after the other to the comparator 7.
  • the driver 6 synchronously controls the memory 8 to match the resistance values belonging to the light-emitting diodes L1 to L4 the change-influencing interval limit values.
  • the flip-flops F1 to F4 are set.
  • the flip-flops F1 and F2 are set.
  • the LEDs L1 and L2 are thus switched off, while the LEDs L3 and L4 continue to light up.
  • the flip-flop F3 is also set and the light-emitting diode L3 is switched off.
  • the flip-flop F4 is also set and the LED L4 is switched off and the LED 9 is switched on.
  • the switching state of the light-emitting diodes is determined by the functional element which has changed most compared to the initial state, taking into account the relationship between the change in the associated resistance value and the parameter influencing the change, which is shown by way of example in FIG. 2. If the light-emitting diode 9 is switched on while the light-emitting diodes L1 to L4 are switched off at the same time, this indicates that at least one of the functional elements has changed as much as possible.
  • the driver receives the instruction to have the functional elements checked.
  • the test device as a workshop diagnostic device, the corresponding situation arises. This indicates that at least one of the functional elements needs closer inspection.
  • the connection between the driver 6 and the designation generator 17 is first established using the switch 15.
  • the naming generator 17 is also clocked synchronously by the driver 6 and reads out the names of the functional elements one after the other, which are queried with the aid of the measuring point switch 5. These terms are passed on to the display devices 12 to 14 if the comparator 7 determines that certain interval limit values have been exceeded.
  • the name of the functional element that has reached its limit state is shown in the display device 12.
  • the output of the comparator 7 which controls the flip-flop F4 and thus the light-emitting diodes L4 and 9 is effective.
  • the display device 13 the functional elements are shown, the change of which, taking into account their change behavior according to FIG. 2, has reached a value of more than 75% of the maximum change.
  • the outputs of the comparator 7 to the flip-flops F3 and F4 are connected to the display device 13 via a UN D gate 25, one input being inverted.
  • the functional elements are shown in the display device 14, the change of which, based on the change-influencing parameters considered, has a value between 50 and 75%.
  • the remaining functional elements below 50% are not shown.
  • the functional elements are thus checked and displayed with regard to their properties and with regard to any replacement that may be required. This is done in the manner of a worst-case representation with the aid of the light-emitting diodes L1 to L4 and 11 and individually with the aid of the playback devices 12 to 14, provided that their change is more than 50%.
  • the need to check the functional elements can be made particularly clear.
  • the measuring point switch 5 queries the functional elements (resistors 1 to 3) once, for example at the start of a journey or at the request of the vehicle user, the light-emitting diodes L1 to L4 which may be lit can be switched off again a short time later.
  • the flip-flops F1 to F4 can be reset by a timer or an oil pressure control switch.
  • the flip-flops F5 to F7 should only be resetable in a workshop.
  • the LEDs 9 to 11 then remain on, expediently only when the motor vehicle is in operation.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Braking Arrangements (AREA)
  • Audible And Visible Signals (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP83112226A 1982-12-23 1983-12-06 Prüfvorrichtung für Kraftfahrzeugs-Funktionselemente Expired EP0111821B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3247858 1982-12-23
DE19823247858 DE3247858A1 (de) 1982-12-23 1982-12-23 Pruefvorrichtung fuer kraftfahrzeug-funktionselemente

Publications (2)

Publication Number Publication Date
EP0111821A1 EP0111821A1 (de) 1984-06-27
EP0111821B1 true EP0111821B1 (de) 1986-04-02

Family

ID=6181645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83112226A Expired EP0111821B1 (de) 1982-12-23 1983-12-06 Prüfvorrichtung für Kraftfahrzeugs-Funktionselemente

Country Status (5)

Country Link
US (1) US4524612A (enrdf_load_stackoverflow)
EP (1) EP0111821B1 (enrdf_load_stackoverflow)
JP (1) JPS59134023A (enrdf_load_stackoverflow)
DE (2) DE3247858A1 (enrdf_load_stackoverflow)
ZA (1) ZA838849B (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4739482A (en) * 1986-04-15 1988-04-19 William Wrigge Motor vehicle maintenance interval monitor
FR2621122A1 (fr) * 1987-09-25 1989-03-31 Applic Electro Tech Avance Systeme de surveillance de parametres d'un vehicule motorise, notamment du moteur de ce vehicule
DE3820306A1 (de) * 1988-06-15 1989-12-21 Bayerische Motoren Werke Ag Verfahren und vorrichtung zum ermitteln des service-zeitpunktes zum bremsfluessigkeitswechsel
DE19607874A1 (de) * 1996-03-03 1997-09-04 Thomas Birnbreier Testgerät für eine Kraftfahrzeuglichtanlage
DE19711338B4 (de) * 1997-03-18 2005-09-29 Bayerische Motoren Werke Ag Verfahren zum Signalisieren einer Service-Maßnahme
DE10029634B4 (de) * 2000-06-15 2010-08-19 Volkswagen Ag Kontrollverfahren für die Wartung eines Kraftfahrzeuges

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972022A (en) * 1973-11-05 1976-07-27 Toyota Jidosha Kogyo Kabushiki Kaisha Indicator of vehicle service intervals
JPS5418812B2 (enrdf_load_stackoverflow) * 1974-08-13 1979-07-10
GB1507725A (en) * 1974-08-30 1978-04-19 Toyota Motor Co Ltd Indicator device for automobiles
US3964018A (en) * 1974-10-29 1976-06-15 Kysor Industrial Corporation Vehicle monitoring system with fault override
US4159531A (en) * 1977-11-21 1979-06-26 Mcgrath Joseph G Programmable read-only memory system for indicating service maintenance points for motor vehicles
FR2449929A1 (fr) * 1979-02-26 1980-09-19 Brisson De Laroche Francois De Auto-controleur de conduite soit d'un vehicule soit d'un engin
US4223302A (en) * 1979-03-05 1980-09-16 Marvel Engineering Company Conditions monitoring device
DE2922910A1 (de) * 1979-06-06 1980-12-11 Rau Swf Autozubehoer Anzeigevorrichtung fuer fahrzeuge
JPS566134A (en) * 1979-06-28 1981-01-22 Nissan Motor Co Ltd Diagnostic unit of controller for car
US4404639A (en) * 1980-12-02 1983-09-13 Chevron Research Company Automotive diagnostic system
JPS57144402A (en) * 1981-03-02 1982-09-07 Akebono Brake Ind Co Ltd Sensor for detecting abrasion loss of brake lining
DE3110774A1 (de) * 1981-03-19 1982-10-14 Daimler-Benz Ag, 7000 Stuttgart "verfahren zur ermittlung von wartungs- und pflegedienstintervallen"
DE3139798A1 (de) * 1981-10-07 1983-04-21 Robert Bosch Gmbh, 7000 Stuttgart Anzeigevorrichtung fuer wartungsintervalle bei brennkraftmaschinen

Also Published As

Publication number Publication date
DE3362820D1 (en) 1986-05-07
JPH0321770B2 (enrdf_load_stackoverflow) 1991-03-25
JPS59134023A (ja) 1984-08-01
US4524612A (en) 1985-06-25
DE3247858A1 (de) 1984-07-05
ZA838849B (en) 1984-09-26
EP0111821A1 (de) 1984-06-27

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