Diagnostic device for a multi-voltage vehicle electrical system, a multi-voltage vehicle electrical system, and a method for operating a multi-voltage vehicle electrical system
First Claim
1. A diagnostic device for a multi-voltage electrical system of a motor vehicle having an internal combustion engine, the multi-voltage vehicle electrical system including a first subnetwork acted on by a first voltage and at least one other subnetwork acted on by at least one other voltage, the first voltage being higher than the at least one other voltage, and the first subnetwork and the at least one other subnetwork having a shared first ground connection, the diagnostic device comprising:
- at least one second ground connection; and
processing circuitry that is programmed to perform a diagnostic function, wherein;
the diagnostic function includes diagnosing a disturbance in at least one of the shared first ground connection and the at least one second ground connection based on (a) an obtained measurement of a current flow via the at least one second ground connection, and (b) at least one operating state of the multi-voltage vehicle electrical system; and
the at least one second ground connection and the shared first ground connection are connected in parallel such that currents flowing via a starter situated in the second subnetwork and a generator situated in the first subnetwork flow via the shared first ground connection and the at least one second ground connection when the internal combustion engine is started under the conditions of the shared first ground connection being undisrupted and the at least one second ground connection being undisrupted.
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Accused Products
Abstract
A diagnostic device is provided for a multi-voltage electrical system of a motor vehicle which has a first subnetwork acted on by a first voltage and a second subnetwork acted on by a second voltage, the first voltage being higher than the second voltage, and the first and the second subnetwork having a shared ground connection. The diagnostic device includes a second ground connection, a measuring unit configured to measure a current flow via the second ground connection, and a diagnostic unit configured to diagnose a disturbance in the shared ground connection and/or in the second ground connection on the basis of the measured current flow via the second ground connection as a function of at least one operating state of the vehicle electrical system.
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Citations
9 Claims
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1. A diagnostic device for a multi-voltage electrical system of a motor vehicle having an internal combustion engine, the multi-voltage vehicle electrical system including a first subnetwork acted on by a first voltage and at least one other subnetwork acted on by at least one other voltage, the first voltage being higher than the at least one other voltage, and the first subnetwork and the at least one other subnetwork having a shared first ground connection, the diagnostic device comprising:
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at least one second ground connection; and processing circuitry that is programmed to perform a diagnostic function, wherein; the diagnostic function includes diagnosing a disturbance in at least one of the shared first ground connection and the at least one second ground connection based on (a) an obtained measurement of a current flow via the at least one second ground connection, and (b) at least one operating state of the multi-voltage vehicle electrical system; and the at least one second ground connection and the shared first ground connection are connected in parallel such that currents flowing via a starter situated in the second subnetwork and a generator situated in the first subnetwork flow via the shared first ground connection and the at least one second ground connection when the internal combustion engine is started under the conditions of the shared first ground connection being undisrupted and the at least one second ground connection being undisrupted. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multi-voltage electrical system for a motor vehicle, comprising:
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a first subnetwork acted on by a first voltage; at least one other subnetwork acted on by at least one other voltage, wherein the first voltage is higher than the at least one other voltage, and the first subnetwork and the at least one other subnetwork have a shared first ground connection; and a diagnostic device including; at least one second ground connection; and processing circuitry that is programmed to perform a diagnostic function, wherein; the diagnostic function includes diagnosing a disturbance in at least one of the shared first ground connection and the at least one second ground connection based on (a) an obtained measurement of a current flow via the at least one second ground connection, and (b) at least one operating state of the multi-voltage vehicle electrical system; and the at least one second ground connection and the shared first ground connection are connected in parallel such that currents flowing via a starter situated in the second subnetwork and a generator situated in the first subnetwork flow via the shared first ground connection and the at least one second ground connection when the internal combustion engine is started under the conditions of the shared first ground connection being undisrupted and the at least one second ground connection being undisrupted.
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9. A method for operating a diagnostic device for a multi-voltage electrical system of a motor vehicle having an internal combustion engine, the multi-voltage vehicle electrical system including a first subnetwork acted on by a first voltage and at least one other subnetwork acted on by at least one other voltage, the first voltage being higher than the at least one other voltage, and the first subnetwork and the at least one other subnetwork having a shared first ground connection, the diagnostic device including at least one second ground connection, and processing circuitry programmed to perform a diagnostic function, the method comprising:
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obtaining, by the processing circuitry, a measurement of a current flow via the at least one second ground connection; and diagnosing, by the processing circuitry performing the diagnostic function, a disturbance in at least one of the shared first ground connection and the at least one second ground connection on the basis of the obtained measurement and as a function of whether the internal combustion engine is started in one of a cold start condition or a warm start condition.
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Specification