Control device for a compressed air system of a vehicle

• US 7,908,055 B2
• Filed: 01/14/2010
• Issued: 03/15/2011
• Est. Priority Date: 07/16/2007
• Status: Expired due to Fees

• Current Assignee: Knorr-Bremse Systeme Fur Nutzfahrzeuge GMBH (Estate of Heinz Hermann Thiele)
• Original Assignee: Knorr-Bremse Systeme Fur Nutzfahrzeuge GMBH (Estate of Heinz Hermann Thiele)
• Inventors: Leinung, Andreas
• Primary Examiner(s): Zanelli; Michael J.
• Application Number:
  US12/687,428
• Publication Number:
  US 20100174452A1
• Time in Patent Office: 425 Days
• Field of Search: None
• US Class Current: 701/36
• CPC Class Codes: B60T 17/02 Arrangements of pumps or compressors, or control devices therefor

Abstract

A control device for a compressed air system of a vehicle or for a component of a compressed air system of a vehicle includes at least one processor calculating a prediction of the occurrence and/or duration of overrun condition phases of the vehicle based on altitude position data of a route traveled by or still to be traveled by the vehicle. The control device controls the compressed air system, a component of the compressed air system, or a component intended to operate the compressed air system, based on the calculated prediction.

Claims

1. A control device for a compressed air system or a component of the compressed air system of a vehicle, comprising:

a processing unit operatively configured to calculate a prediction about occurrence and a duration of overrun condition phases of the vehicle using received altitude position data of a section of road upon which the vehicle is traveling or is to travel along; and

wherein the processing unit is further operatively configured to check, for control purposes, whether the calculated prediction about the duration of an overrun condition phase is longer than a predefined minimum duration, said processing unit controlling at least one of the compressed air system, the component of the compressed air system, and a component for operating the compressed air system using the calculated prediction and a result of checking whether the calculated prediction about the duration of an overrun condition phase is longer than a predefined minimum duration.

2. The control device as claimed in claim 1, wherein the processing unit calculates a prediction which indicates whether and where overrun condition phases are expected to occur along a segment of the section of road respectively lying ahead of the vehicle.

3. The control device as claimed in claim 1, wherein the processing unit calculates a prediction which indicates whether and when overrun condition phases will occur in a respectively imminent time period.

4. The control device as claimed in claim 1, wherein the control device calculates a prediction about an expected start and/or end time of overrun condition phases, a time interval until an occurrence of overrun condition phases, or a chronological duration of overrun condition phases.

5. The control device as claimed in claim 1, wherein the processing unit defines, by way of the calculated prediction, execution times of switching processes by which the component of the compressed air system or the component provided for operating the compressed air system is optionally adjustable at least from a first state into a second state or vice versa using predicted overrun condition phases.

6. The control device as claimed in claim 5, wherein the processing unit actuates a clutch connected between a vehicle engine and a compressor of the compressed air system.

7. The control device as claimed in claim 6, wherein in the first state the clutch couples the compressor to the vehicle engine, and in the second state it prevents the engagement of the clutch, or vice versa.

8. The control device as claimed in claim 5, wherein the processing unit actuates at least one compressor which in the first state delivers compressed air to a compressed air distributor, a compressed air supply unit, a compressed air consumer or to another component, and which in the second state causes compressed air to be delivered in a different manner than in the first state.

9. The control device as claimed in claim 8, wherein in the first state the compressor supplies the air supply unit with compressed air, and in the second state said compressor is switched into an idling state in which the air supply unit is not supplied with compressed air or only with compressed air at a lower pressure than in the first state.

10. The control device as claimed in claim 5, wherein the processing unit controls a compressed air valve which in the first state passes on compressed air, and in the second state blocks or reverses the passing on of compressed air.

11. The control device as claimed in claim 5, wherein the processing unit actuates a compressed air distributor which in the first state takes up compressed air and passes it on, and which in the second state prevents the taking up of compressed air.

12. The control device as claimed in claim 5, wherein the processing unit actuates a compressed air supply unit which has a compressed air cartridge, wherein in the first state the compressed air supply unit permits, as a result of the control taking place by way of the calculated prediction, a cleaning and passing on of new compressed air through the compressed air cartridge through to at least one compressed air consumer, and in the second state said compressed air supply unit regenerates the compressed air cartridge.

13. The control device as claimed in claim 12, wherein the control device controls the compressed air system or the component by way of the calculated prediction such that times at which regeneration of the compressed air cartridge are carried out, are influenced using the predicted overrun condition phases.

14. The control device as claimed in claim 1, wherein the processing unit actuates the component as a function of the altitude position data of the section of road and received location coordinates of the vehicle such that the component is in a first state during the overrun condition phases or during selected overrun condition phases and is in a second state or in further states at least outside the overrun condition phases.

15. The control device as claimed in claim 14, wherein the processing unit actuates the component such that the component is in the first state during such overrun condition phases whose expected duration is longer than a predefined minimum duration and is otherwise in the second state or in further states.

16. The control device as claimed in claim 1, wherein, in at least one operating state of the compressed air system, the processing unit controls the compressed air system, the component of the compressed air system or the component provided for operating the compressed air system using the calculated prediction.

17. The control device as claimed in claim 1, wherein the processing unit actuates a vehicle component which is directly or indirectly connected between a vehicle engine and at least one compressed air consumer of the compressed air system.

18. The control device as claimed in claim 1, wherein the processing unit actuates a vehicle component which is connected upstream of compressed-air-conducting components of the compressed air system and influences an effect of a vehicle engine on the compressed air system.

19. The control device as claimed in claim 1, wherein the processing unit also calculates said prediction using received location coordinates which indicate an instantaneous position of the vehicle along the section of road.

20. The control device as claimed in claim 19, wherein a control device controls a compressed air supply of at least one of:

a brake system, a component of a brake system, a compressed air distributor, a delivery line for compressed air, and a pneumatic control line as a function of the altitude position data of the section of road and of the received location coordinates of the vehicle.

21. The control device as claimed in claim 1, wherein the control device controls the compressed air system or the component by way of the calculated prediction such that at least one of delivery of compressed air and taking up of compressed air takes place exclusively during predicted overrun condition phases.

22. The control device as claimed in claim 21, wherein the control device controls the compressed air system or the component by way of the calculated prediction such that at least one of delivery of compressed air and taking up of compressed air takes place during overrun condition phases whose duration exceeds a predefined, defined or parameter-dependent minimum duration.

23. The control device as claimed in claim 1, wherein the processing unit calculates in advance, from the altitude position data of the section of road and from a direction of travel determined from received location coordinates of the vehicle along the section of road, where a section of road with a negative gradient will respectively occur in the direction of travel on the section of road or on a segment of the section of road lying directly ahead of the vehicle.

24. The control device as claimed in claim 23, wherein the processing unit calculates at least one of:

a time interval to imminent overrun condition phases, a chronological duration of the overrun condition phases themselves, and times of their start and/or their end, by way of the sections of road with the negative gradient which are calculated in advance.

25. The control device as claimed in claim 1, wherein the processing unit calculates a prediction for the expected time period of overrun condition phases which have already begun and/or are imminent, and compares them with the predefined minimum duration, and causes overrun condition phases having calculated time periods longer than the predefined minimum duration to at least one of:

(i) deliver compressed air by way of a compressor in the direction of a compressed air distributor or a compressed air consumer, (ii) take up air by way of the compressed air distributor, (iii) switch at least one compressed air valve from a first state into a second state, and (iv) switch a clutch.

26. The control device as claimed in claim 1, wherein the processing unit calculates, for the purpose of control, a distance along the section of road and/or a travel time, after which a first overrun condition phase whose duration is expected to exceed the predefined minimum period will occur.

27. The control device as claimed in claim 1, wherein the processing unit compares lengths of sections of road with a negative gradient lying ahead with a predefined minimum length and outputs prediction data which permits targeted utilization of overrun condition phases on only those sections of road with a negative gradient whose length exceeds the predefined minimum length.

28. The control device as claimed in claim 27, wherein the processing unit uses, for said comparison, limiting values which depend on one or more instantaneous vehicle parameters.

29. The control device as claimed in claim 1, wherein, for an instantaneous overrun condition phase which has already started, the processing unit calculates a prediction about the expected remaining chronological duration of this overrun condition phase.

30. The control device as claimed in claim 1, wherein the processing unit generates in each case a control signal for an expected imminent or already started overrun condition phase, said control signal defining, as a function of the expected remaining chronological duration of this overrun condition phase, whether or not technical utilization of this overrun condition phase is to be brought about, which utilization causes compressed air for at least one vehicle component to be generated, delivered, passed on, conditioned or stored.

31. The control device as claimed in claim 30, wherein the processing unit generates in each case a control signal for an overrun condition phase which has already started, said control signal then causing technical utilization of this overrun condition phase when the expected, still remaining chronological duration of the instantaneous overrun condition phase exceeds a predefined limiting value, which utilization causes compressed air for at least one vehicle component to be generated, delivered, passed on, conditioned or stored.

32. The control device as claimed in claim 1, wherein, for instantaneous or future overrun condition phases whose chronological duration is in each case expected to be shorter than a predefined chronological minimum duration and which precede the calculated earliest future overrun condition phase with a longer duration than the predefined minimum duration, the processing unit prevents technical utilization of these preceding shorter overrun condition phases.

33. The control device as claimed in claim 1, wherein the control device processes, for the purpose of control, current vehicle parameters, wherein the current vehicle parameters comprise at least one of:

received location coordinates or received altitude position data of the vehicle, vehicle speed, wheel speeds, yaw rates, vehicle acceleration, a compressed air level of a brake system, a humidity level of a compressed air vessel or a compressed air supply cartridge, an engine speed, an absolute value and/or sign of an engine torque, clutch data, gearspeed data, retarder data of the vehicle, a distance from another vehicle traveling ahead.

34. The control device as claimed in claim 33, wherein the location data which are processed by the processing unit each indicate the instantaneous position of the traveling vehicle along the section of road.

35. The control device as claimed in claim 1, further comprising a navigation device which receives location coordinates indicative of an instantaneous position of the vehicle along the section of road, and passes said location coordinates onto the processing unit.

36. The control device as claimed in claim 35, wherein the control device, the navigation device thereof, or the processing unit thereof, has a memory unit in which the altitude position data of the section of road are stored.

37. The control device as claimed in claim 35, wherein the navigation device also receives the altitude position data of the section of road and passes it onto the processing unit.

38. The control device as claimed in claim 37, wherein the altitude position data are vertical position coordinates of a plurality of points or sections on the section of road which is being traveled along or is to be traveled along.

39. The control device as claimed in claim 35, wherein the navigation device of the control device receives not only the coordination data of the vehicle but also altitude position data indicative of an instantaneous altitude position of the vehicle.

40. The control device as claimed in claim 35, wherein the navigation device comprises a GPS receiver.

41. The control device as claimed in claim 1, wherein the control device carries out the control by use of pneumatic control signals.

42. The control device as claimed in claim 41, wherein the control device controls air pressure of a pneumatic control line, which leads from a compressed air distributor to a compressor.

43. The control device as claimed in claim 1, wherein the control device carries out the control by use of electrical or optical control signals.

44. A method of operating a compressed air system or a component of the compressed air system of a vehicle, the method comprising the acts of:

receiving altitude position data about a section of road on which the vehicle is traveling or is to travel;

calculating a prediction about an occurrence and a duration of overrun condition phases of the vehicle as a function of the received altitude position data; and

controlling at least one of the compressed air system, the component of the compressed air system, and a component for operating the compressed air system using the calculated prediction about the occurrence and the duration of overrun condition phases of the vehicle.

45. The method according to claim 44, further comprising the act of:

checking whether the calculated prediction about the duration of an overrun condition phase is longer than a predefined minimum duration; and

using a result of the checking act for controlling the compressed air system, the component of the compressed air system, or the component provided for operating the compressed air system.

46. The method according to claim 44, wherein the calculated prediction comprises information about whether and where overrun condition phases are expected to occur along the section of road ahead of the vehicle.