Method and system for detection of torque deviations of an engine in a vehicle

Patent metadata

Field	Value
Publication number	US-10247124-B2
Application number	US-201615580316-A
Country	US
Kind code	B2
Filing date	May 26, 2016
Priority date	Jun 15, 2015
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A method and a system for detection of torque deviations of an engine ( 101 ) in a vehicle ( 100 ). A measurement ( 201 ) is made of actual measured values D act related to a behavior of at least one parameter which is related to an actual torque M eng _ act delivered by the engine ( 101 ). This actual torque M eng _ act is delivered here by the engine ( 101 ) in consequence of a torque M eng _ req demanded from the engine ( 101 ). A comparison ( 202 ) is then made of the actual measured values D act which are related to the behavior of the at least one parameter with previously determined measured values D ref of correspondingly at least one respective parameter related to the actual torque M eng _ act . The previously determined measured values D ref will here have been determined during normal operation of the vehicle ( 100 ). Detection is then made of whether the actual measured actual torque M eng _ act deviates from the demanded torque M engj-eq . The detection is based here on the comparison of the actual measured values D act with the previously determined measured values D ref .

First claim

The invention claimed is:

1. A method for detection of torque deviations of an engine in a vehicle, the method comprising:
measuring actual measured values related to a behavior of at least one parameter related to an actual torque delivered by said engine in consequence of a torque demanded from said engine;
comparing said actual measured values related to said behavior of said at least one parameter with previously determined measured values of correspondingly at least one respective parameter related to said actual torque, said previously determined measured values having been determined during normal operation of said vehicle;
detecting whether said actual torque deviates from said demanded torque, said detection being based on said comparison; and
controlling the vehicle based on the detection.

2. A method according to claim 1 , wherein said previously determined measured values which correspond to said at least one respective parameter related to said actual torque, will have been determined when said vehicle was substantially new, and will have thereafter been maintained.

3. A method according to claim 1 , wherein said previously determined measured values which correspond to said at least one respective parameter related to said actual torque, will have been determined by at least partly continuous updating of said previously determined measured values during said vehicle's use.

4. A method according to claim 1 , wherein said normal operation comprises either or both of:
a movement of said vehicle when fuel is being injected into said engine, and
a dragging of said vehicle.

5. A method according to claim 1 , wherein said at least one parameter which is related to an actual torque comprises a speed of said engine.

6. A method according to claim 5 , wherein
said previously determined measured values will have been determined at loads and speeds of said engine during a normal operation of said vehicle;
said measurement of said behavior of said at least one parameter comprises measuring an actual amplitude variation of an actual speed of said engine; and
said comparison comprises a comparison of said actual amplitude variation and said previously determined measured values of said engine speed.

7. A method according to claim 6 , further comprising:
detecting a stoppage in a fuel supply to said engine based on said comparison of said actual amplitude variation and said previously determined measured values of said engine speed,
wherein said detection uses a relationship that said actual amplitude variation increases with increasing actual load if there is fuel supply to said engine.

8. A method according to claim 6 , further comprising:
detecting an actual fuel type used which has an actual energy content which deviates from an expected energy content of an expected fuel type used,
wherein said detection is based on said comparison of said actual amplitude variation and said previously determined measured values of said engine speed and uses a relationship that said actual amplitude variation is proportional to said actual energy content.

9. A method according to claim 6 , wherein said actual amplitude variation is proportional to a torque generated by said engine.

10. A method according to claim 1 , wherein said at least one parameter related to an actual torque comprises supplying a charge pressure of air to said engine.

11. A method according to claim 10 , wherein
said previously determined measured values are determined at loads and charge pressures of air which is supplied to said engine during normal operation of said vehicle;
said measurement of said behavior of said at least one parameter comprises measurement of an actual charge pressure of said engine; and
said comparison comprises a comparison of said actual charge pressure and said previously determined measured values of said charge pressure.

12. A method according to claim 11 , wherein said detection of whether said actual torque deviates from said demanded torque uses a relationship that said actual charge pressure increases with increasing actual load.

13. A method according to claim 1 , wherein said at least one parameter which is related to an actual torque comprises a temperature of said engine.

14. A method according to claim 13 , wherein
said previously determined measured values are determined at loads and temperatures of said engine during normal operation of said vehicle;
said measurement of said behavior of said at least one parameter comprises measurement of an actual temperature of said engine; and
said comparison comprises a comparison of said actual temperature and said previously determined measured values of said temperature.

15. A method according to claim 14 , wherein said detection of whether said actual torque deviates from said demanded torque uses a relationship that should increase with said actual load.

16. A method according to claim 1 , further comprising a plurality of said previously determined measured values are statistically correlated.

17. A method according to claim 16 , wherein the statistical correlation comprises at least one of:
an average value of measured values of said at least one respective parameter related to said actual torque;
a standard deviation of measured values of said at least one respective parameter related to said actual torque.

18. A method according to claim 17 , wherein said comparison comprises use of a null hypothesis analysis.

19. A method according to claim 1 , wherein said previously determined measured values are divided into intervals of a load for said engine.

20. A computer program product comprising a non-volatile computer-readable medium and a computer program comprised of program codes contained in said computer-readable medium such that when said program codes are executed in a computer, that causes said computer to apply the method according to claim 1 .

21. A system configured for detection of torque deviations of an engine in a vehicle, the system comprising:
a measuring unit configured for measurement of actual measured values related to a behavior of at least one parameter related to an actual torque delivered by said engine in consequence of a torque demanded from said engine;
a comparison unit configured for comparison of said actual measured values related to said behavior of said at least one parameter with previously determined measured values of correspondingly at least one respective parameter related to said actual torque, said previously determined measured values having been determined during normal operation of said vehicle;
a detection unit configured for detection of whether said actual torque deviates from said demanded torque,
wherein said detection is based on said comparison; and
a utilization unit configured to control at least one system in said vehicle based on the detection.

22. A vehicle comprising a system according to claim 21 .

Assignees

• Scania Cv Ab

Inventors

• Johansson Björn
• Svärd Carl

Classifications

• F02D2200/0406

  Intake manifold pressure · CPC title

• G01M15/042 Primary

  by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 · CPC title

• G01P3/44

  for measuring angular speed (G01P3/56 takes precedence) · CPC title

• F02D41/22

  Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} · CPC title

• F02D2200/0612

  determined by estimation · CPC title