Diagnostic systems and methods for isolating failure modes of a vehicle

Patent metadata

Field	Value
Publication number	US-11022060-B2
Application number	US-201716620200-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
Priority date	Jun 8, 2017
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A system includes a controller having a control signal generation unit that provides control signals to actuate one or more valve actuators of an engine to a desired position, and control signals to modify one or more operational parameters and an operational mode of the engine. A parameter signal process unit receives parameter signals corresponding to at least one operational parameter of the engine, and at least one sensor coupled to the engine. At least one sensor corresponds to a position of a valve. A failure detection unit generates at least one fault code corresponding to one or more failure modes. A failure mode isolation unit isolates a failure mode from the one or more failure modes in response to modifying the operational parameters or the operational mode, causing actuation of the valves to a desired position, or receiving the parameter signals and the sensor.

First claim

What is claimed is:

1. A method comprising:
generating, by a controller, at least one fault code corresponding to one or more failure modes;
modifying, by the controller, a mode of operation of an engine in response to the generated at least one fault code;
actuating, by the controller, one or more valve actuators of the engine to a desired position in response to the generated at least one of fault code;
receiving, by the controller, at least one parameter value corresponding to one or more operational parameters of the engine in response to the generated at least one of fault code;
receiving, by the controller, data provided by at least one sensor positioned within the engine in response to the generated at least one of fault code; and
isolating, by the controller, a failure mode from the one or more failure modes in response to at least one of: modifying the mode of operation of the engine, actuating one or more valve actuators, receiving the at least one parameter value, and receiving the data provided by the at least one sensor.

2. The method of claim 1 , wherein generating at least one fault code includes generating one of: a turbo speed fault code, a charge pressure fault code, an inter-stage pressure fault code, a compressor by-pass valve stuck open fault code, and a compressor by-pass valve stuck closed fault code.

3. The method of claim 1 , wherein the one or more failure modes include: a turbo speed sensor in-range failure mode, an inter-stage pressure sensor failure mode, a charge pressure sensor in-range failure mode, a high speed turbo failure mode, a high pressure turbo failure mode and a compressor by-pass valve efficiency failure mode.

4. The method of claim 1 , wherein modifying a mode of operation of an engine includes operating the engine in a normal mode and then operating the engine in an abnormal mode.

5. The method of claim 1 , further including modifying at least one operational parameter of the engine in response to the generated at least one fault code, wherein the engine is an internal combustion engine and modifying at least one operational parameter of the engine includes modifying an engine speed of the internal combustion engine.

6. The method of claim 1 , further including receiving data provided by the at least one sensor in response to a compressor by-pass valve (“CBV”) being moved to an opened position and receiving data provided by the at least one sensor in response to the CBV being moved to a closed position.

7. The method of claim 5 , wherein modifying at least one operational parameter of the engine includes increasing the engine speed from a first engine speed to a second engine speed.

8. The method of claim 7 , further including receiving data provided by the at least one sensor when the engine speed is the first engine speed and the CBV is in the opened position, and receiving data provided by the at least one sensor when the engine speed is the first engine speed and the CBV is in the closed position.

9. The method of claim 7 , further including receiving data provided by the at least one sensor when the engine speed is the second engine speed and the CBV is in the opened position, and receiving data provided by the at least one sensor when the engine speed is the second speed and the CBV is in the closed position.

10. The method of claim 9 , wherein the at least one sensor includes a turbo speed sensor, an inter-stage pressure sensor, and a charge pressure sensor; and wherein the first engine speed is 600 RPM and the second engine speed is 2000 RPM.

11. A system comprising:
a controller including a control signal generation unit, a parameter signal process unit, and a failure mode isolation unit;
the control signal generation unit configured to:
provide control signals to actuate one or more valve actuators of an engine to a desired position;
provide control signals to modify one or more operational parameters of the engine; and
provide control signals to modify an operational mode of the engine;

the parameter signal process unit configured to:
receive parameter signals corresponding to at least one operational parameter of the engine; and
receive parameter signals from at least one sensor coupled to the engine, wherein the at least one sensor corresponds to a position of a valve;

the failure detection unit configured to generate at least one fault code corresponding to one or more failure modes; and
the failure mode isolation unit configured to isolate a failure mode from the one or more failure modes in response to at least one of: modifying one or more operational parameters of the engine, modifying an operational mode of the engine, causing actuation of one or more valves to a desired position, receiving parameter signals corresponding to at least one of an operational parameter of the engine and the at least one sensor.

12. The system of claim 11 , wherein the controller is configured to generate data signals indicating at least one fault code wherein the at least one fault code indicates a potential failure of one or more engine components.

13. The system of claim 12 , wherein the one or more engine components include: a turbo speed sensor, an inter-stage pressure sensor, a charge pressure sensor, and a compressor by-pass valve position sensor, and wherein the one or more failure modes include: a turbo speed sensor in-range failure mode, an inter-stage pressure sensor failure mode, a charge pressure sensor in-range failure mode, a high speed turbo failure mode, and a compressor by-pass valve efficiency failure mode.

14. The system of claim 11 , wherein the engine includes a compressor by-pass valve (CBV) moveable between an opened position and a closed position, wherein the parameter signal process unit is further configured to receive data signals provided by one or more sensors in response to the CBV moving to an opened position and receiving data provided by the one or more sensors in response to the CBV moving to a closed position.

15. The system of claim 14 , wherein modifying at least one operational parameter of the engine includes increasing engine speed from a first engine speed to a second engine speed, wherein the parameter signal process unit is further configured to:
receive data signals provided by the one or more sensors when the engine speed is the first engine speed and the CBV is in the opened position and
receive data signals provided by the one or more sensors when the engine speed is the first engine speed and the CBV is in the closed position.

16. The system of claim 15 , wherein the parameter signal process unit is further configured to:
receive data signals provided by the one or more sensors when the engine speed is the second engine speed and the CBV is in the opened position; and
receive data signals provided by the one or more sensors when the engine speed is the second engine speed and the CBV is in the closed position.

17. The system of claim 16 , wherein the one or more sensors include a turbo speed sensor, an inter-stage pressure sensor, and a charge pressure sensor; and wherein the first engine speed is 600 RPM and the second engine speed is 2000 RPM.

18. The system of claim 17 , wherein the failure mode isolation unit is further configured to monitor data signals corresponding to the charge pressure sensor and determine if the charge pressure exceeded a predetermined threshold charge pressure during a time period between when the CBV is in the opened position at the second engine speed and when the CBV is in the closed position at the second engine speed.

Assignees

• Cummins Inc

Inventors

• Ward Jason
• Mohan Krithika

Classifications

• F02D2041/228

  Warning displays · CPC title

• Y02T10/40

  Engine management systems · CPC title

• F02D2041/281

  between sensors and control unit · CPC title

• F02B37/16

  by bypassing charging air · CPC title

• F02D41/222

  relating to the failure of sensors or parameter detection devices · CPC title