Fault simulator for checking the diagnosis implemented in a control device for a lambda sensor in an internal combustion engine
First Claim
1. 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:
- checking for the fault detection with a microcontroller of a fault simulator disposed between the broadband lambda probe and the control device;
modifying, to simulate faults of the broadband lambda probe, via the microcontroller, 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 microcontroller; and
delivering, via the microcontroller, 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 microcontroller interrupts delivery of the Nernst voltage from the broadband lambda probe to the control device, and delivers to the control device a modified Nernst voltage while the broadband lambda probe continues to operate, wherein the modified Nernst voltage is modified with respect to the Nernst voltage received by the microcontroller from the broadband lambda probe,wherein to simulate a modified pump current, the microcontroller delivers the modified Nernst voltage to the control device, andwherein to simulate faults, the microcontroller outputs to the control device a defined Nernst voltage or a Nernst voltage that is variable as a function of time.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
9 Claims
-
1. 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:
-
checking for the fault detection with a microcontroller of a fault simulator disposed between the broadband lambda probe and the control device; modifying, to simulate faults of the broadband lambda probe, via the microcontroller, 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 microcontroller; and delivering, via the microcontroller, 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 microcontroller interrupts delivery of the Nernst voltage from the broadband lambda probe to the control device, and delivers to the control device a modified Nernst voltage while the broadband lambda probe continues to operate, wherein the modified Nernst voltage is modified with respect to the Nernst voltage received by the microcontroller from the broadband lambda probe, wherein to simulate a modified pump current, the microcontroller delivers the modified Nernst voltage to the control device, and wherein to simulate faults, the microcontroller outputs to the control device a defined Nernst voltage or a Nernst voltage that is variable as a function of time. - View Dependent Claims (2, 3, 4, 5, 6, 8)
-
-
7. 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:
-
a microcontroller 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 microcontroller, wherein a pump current is deliverable to the broadband lambda probe and a Nernst voltage is deliverable to the control device by the microcontroller; wherein the microcontroller is configured to interrupt delivery of the Nernst voltage from the broadband lambda probe to the control device, and deliver to the control device a modified Nernst voltage while the broadband lambda probe continues to operate, wherein the modified Nernst voltage is modified with respect to the Nernst voltage received by the microcontroller from the broadband lambda probe, and wherein to simulate a modified pump current, the modified 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. - View Dependent Claims (9)
-
Specification