Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Patent
1999-09-16
2000-09-19
Hernandez, Olga
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
701 36, 340438, 702183, 307 31, G06F 1132
Patent
active
061225762
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the diagnosis of electrical consumers by evaluating the battery voltage.
BACKGROUND OF THE INVENTION
In this connection, it is known from U.S. Pat. No. 5,197,326 to evaluate the on-board voltage for diagnosing an rpm transducer. The drop and subsequent increase of the on-board voltage is detected by the control apparatus, that is, the battery voltage when actuating the starter. When the control apparatus detects such a voltage trace, the conclusion is drawn that a start operation has taken place. The output signal of the rpm transducer, which is to be monitored, then has to permit recognition that the crankshaft rotates. If the output signal of the rpm transducer does not change, then a defect of the transducer or a line interruption must be present.
DE 44 22 149 discloses how, for example, the operability of a lamp during normal operation of the vehicle can be checked by evaluating the on-board voltage. Disturbances are superposed on the on-board voltage when switching on and switching off individual consumers in normal operation of the motor vehicle which disturbances are caused by the actuation of other consumers. As an example, the injection and ignition signals are mentioned which regularly occur in a running engine. To ease this situation, DE 44 22 149 provides a modeling of the on-board voltage in the operation and/or a mathematical convolution of the measured on-board voltage with a jump-shaped signal. From this, an independence is intended to be achieved from direct-current voltage components and a reduced sensitivity against high-frequency disturbances such as occur in the operation of the vehicle.
SUMMARY OF THE INVENTION
The object of the invention is providing an on-board voltage evaluation for checking electrical consumers in a motor vehicle whose disturbance sensitivity has been further reduced and whose evaluation is further simplified. In this way, the reliability of the evaluation is overall simplified.
The essence of the invention is that various electrical consumers are driven when the influences of other consumers on the on-board voltage changes can be neglected.
In a first embodiment, individual consumers are driven in the control apparatus post-operation when the engine is switched off and a conclusion as to the operability of the consumer is drawn based on the change of the battery voltage.
Motor vehicles whose engines are controlled with the aid of a control apparatus have electronic assembly groups which must be supplied with voltage not only during operation of the motor vehicle but also after switching off the engine, that is, after opening the ignition switch. Conventionally, it is necessary to maintain this voltage supply only for a specific time span after switching off the engine. This time span is generally characterized as the control apparatus post-operation.
Switching on an electrical consumer during the post-operation of the control apparatus leads to a characteristic change of the on-board voltage which is dependent upon the electrical characteristics of the supply line and the consumer (ohmic, capacitive and/or inductive load) and is evaluated for diagnosis in accordance with the invention. As an alternative to the voltage, other electrical parameters, such as the current change, can also be measured.
Consumers, which can be diagnosed, can conceivably be, for example, valves (such as the exhaust-gas recirculation valve, the tank-venting valve, the injection valves) or other equipment (such as the secondary air pump, blowers, ignition coils, et cetera). These consumers are driven normally by the engine control apparatus. The method can, in principle, be expanded to all consumers such as the electrical heaters (for the catalytic converter, the exhaust-gas probe, et cetera) and the light equipment. It is, however, advantageous that the consumer can be controlled independently. After switching the consumer on and off, the particular battery voltage trace is stored. The measurement signals can now be further processed
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Hernandez Olga
Ottesen Walter
Robert & Bosch GmbH
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