FAULT SIMULATOR FOR CHECKING THE DIAGNOSIS IMPLEMENTED IN A CONTROL DEVICE FOR A LAMBDA SENSOR IN AN INTERNAL COMBUSTION ENGINE
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Abstract
A method for checking fault detection of a control device of an internal combustion engine for malfunction of a connected broadband lambda probe, including checking with a fault simulator between the lambda probe and the control device; to simulate faults of the broadband lambda probe, the fault simulator modifies electrical signals between the broadband lambda probe and the control device. A Nernst voltage of the lambda probe and a pump current of the control device are delivered to the fault simulator; the fault simulator delivers a pump current to the lambda probe and a Nernst voltage to the control device; to simulate faults of the lambda probe, the fault simulator modifies the Nernst voltage to the control device as to the Nernst voltage outputted from the lambda probe. Also described is a related fault simulator. The method and fault simulator monitor the fault detection of control devices for lambda probes.
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Citations
16 Claims
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1-9. -9. (canceled)
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10. A method for checking a fault detection of a control device of an internal combustion engine for a malfunction of a connected broadband lambda probe, the method comprising:
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checking for the fault detection with a fault simulator disposed between the broadband lambda probe and the control device; modifying, to simulate faults of the broadband lambda probe, via the fault simulator, electrical signals exchanged between the broadband lambda probe and the control device, a Nernst voltage of the broadband lambda probe and a pump current of the control device being delivered to the fault simulator; and delivering, via the fault simulator, a pump current to the broadband lambda probe and a Nernst voltage to the control device; wherein to simulate faults of the broadband lambda probe, the fault simulator modifies the Nernst voltage delivered to the control device with respect to the Nernst voltage outputted from the broadband lambda probe, wherein to simulate a modified pump current, the fault simulator modifies the Nernst voltage delivered to the control device with respect to the Nernst voltage outputted from the broadband lambda probe, and wherein to simulate faults, the fault simulator outputs to the control device a defined Nernst voltage or a Nernst voltage that is variable as a function of time. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A fault simulator for checking a fault detection of a control device of an internal combustion engine for a malfunction of a connected broadband lambda probe, comprising:
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a fault simulator arrangement disposed between the broadband lambda probe and the control device to simulate faults of the broadband lambda probe, wherein a Nernst voltage of the broadband lambda probe and a pump current of the control device is deliverable to the fault simulator, wherein a pump current is deliverable to the broadband lambda probe and a Nernst voltage is deliverable to the control device by the fault simulator; wherein the fault simulator arrangement is configured to modify the Nernst voltage to the control device with respect to the Nernst voltage outputted from the broadband lambda probe, and wherein to simulate a modified pump current, the Nernst voltage delivered to the control device is variable with respect to the Nernst voltage outputted from the broadband lambda probe, the Nernst voltage or a Nernst voltage that is variable as a function of time being outputtable to the control device.
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Specification