Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Patent
1997-07-02
2000-02-29
Dombroske, George
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
731173, 731181, 701 29, G01M 1700, G01M 1900
Patent
active
060320885
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for checking the component systems in motor vehicles, which are equipped with on-board diagnostic systems, at the end of the manufacturing process as well as for customer service.
BACKGROUND OF THE INVENTION
Modern motor vehicles are equipped with so-called on-board diagnostic systems because of statutorily mandated requirements. With the aid of these systems, the operability of exhaust-gas relevant vehicle component systems is monitored. One example of such a system is a tank-venting system having an active charcoal filter, a controllable tank-venting valve as well as associated line connections. An apparatus for on-board diagnosis of a tank-venting valve is described, for example, in U.S. Pat. No. 4,794,790.
It is customary to check these systems when first taking the vehicle into service with the aid of the on-board diagnostic functions. For this purpose, a driving curve of operating points having predetermined values of load, rpm and other parameters, if required, is run through under defined conditions on a test stand. The drive curve is so defined that the on-board diagnostic programs run through automatically. If an exhaust-gas relevant fault is registered, then this is stored as a fault announcement in the control apparatus and is signalized to the outside during or after the test run, for example, via an external tester so that measures can be taken to eliminate the fault.
The read-out of self-testing data in combination with a control at the end of the assembly line is, for example, known from VDI Berichten 612, page 392. The system presented there relates to the expansion of existing control apparatus with a suitable interface for the purpose of making the data of the self test of the control apparatus, for example, understandable to a service technician.
A high expenditure of time is associated with carrying out a driving curve which is adequate for triggering and carrying out the on-board diagnostic functions. This is so because the diagnostic functions designed for everyday operation are triggered by the control apparatus, for example, only after the elapse of a certain time span after the start of the vehicle. This time span can be in the range of minutes which is a very long time span for a test at the end of an assembly line.
SUMMARY OF THE INVENTION
The object of the invention is to provide an arrangement which shortens this test time while retaining the on-board diagnostic functions implemented in the known apparatus.
The arrangement according to the invention makes possible a simple function check of the component systems such as secondary-air blow-in and tank venting while considering all relevant components with reduced test time. The utilization of existing diagnostic functions makes unnecessary the implementation of self diagnostic functions provided only for the check at the end of the assembly line testing or for customer service testing. In this way, a reduction of the program complexity as well as an overall optimized structure of the control program of the diagnostic arrangement is achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the drawings wherein.
FIG. 1 shows an internal combustion engine having a tank-venting system and a secondary-air system as examples of component systems which are to be checked with on-board means; and,
FIG. 2 shows an embodiment of method steps which are carried out by the control apparatus 4 of FIG. 1 as an arrangement of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
The 1 in FIG. 1 identifies an internal combustion engine having an intake pipe 2, an exhaust-gas pipe 3, a tank-venting system, a secondary-air system and a control apparatus 4 as well as an external test apparatus 5.
The tank-venting system includes a tank 6, an active charcoal filter 7 and a tank-venting valve 8.
In the intake pipe 2, means 9 are provided for detecting the air quantity m, which is inducted by the engine, a throttle flap 10,
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patent: 5671141 (1997-09-01), Smith et al.
patent: 5737711 (1998-04-01), Abe
Edelmann Thomas
Feldmann Ekkehard
Frech Eberhard
Schray Bernhard
Dombroske George
Ottesen Walter
Robert & Bosch GmbH
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