Method of controlling a power train of a vehicle and device for carrying out said method

Patent metadata

Field	Value
Publication number	US-9638112-B2
Application number	US-201214344194-A
Country	US
Kind code	B2
Filing date	Sep 17, 2012
Priority date	Sep 15, 2011
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

The present invention relates to a method and device for controlling a vehicle, more particularly, the power train of a compacting machine for earth moving operations, comprising a hydraulic travel pump and a hydraulic travel motor. Control is effected according to a specified control profile when a specified driving operation is to be carried out in that an adjustment of the travel pump is carried out which is independent of the rotational speed of the internal combustion engine. This makes it possible to retain, on the one hand, the rotational speed of the internal combustion engine in the case of abrupt stops of movement or changes in the direction of movement and, on the other hand, to adapt the rotational speed of the engine in the case of somewhat longer uninterrupted pauses between two changes in the traveling behavior, wherein comparatively large fluctuations in the rotational speed are avoided.

First claim

What is claimed is:

1. A method of controlling a power train of a vehicle, the power train comprising a travel pump, wherein an adjustment of a travel pump driven by an internal combustion engine is made and in which control of the power train takes place independently of a rotational speed of the internal combustion engine according to a specific control profile when a specific driving operation is to be carried out,
wherein the control is determined by an operational timing of an accelerator pedal, and
the rotational speed of the internal combustion engine is fixed over a first specified period of time T 1 , and the control profile is set such that the rotational speed of the internal combustion engine follows a predetermined profile over a second specified period of time T 2 , and
wherein the periods of time are adjusted such that during the succession of accelerating and braking operations within a typical period of time there is no rotational speed change,
and further wherein typical periods of time are determined dynamically, in that during operation, frequently repeated driving and accelerating operations and/or driving cycles are determined, from which the typical periods of time for the current operation are derived.

2. The method according to claim 1 , wherein the control profile is set such that the rotational speed of said internal combustion engine does not fall below a preset value (standby speed) during the driving operation.

3. The method according to claim 1 , in which a rotational speed-dependent control pressure is produced for a pressure-dependent travel pump of a travel motor, wherein said control profile is produced from driving patterns of a typical driving operation.

4. The method according to claim 3 , wherein said control profile is produced with consideration for frequent reverse drives.

5. The method according to claim 1 , wherein a control pressure acting on said travel pump is produced as a function of said predetermined control profile.

6. The method according to claim 5 , wherein said control pressure governed by the rotational speed of said internal combustion engine and acting on said travel pump is reduced as a function of said control profile.

7. A device for carrying out the method according to claim 1 , wherein, on an input side of a travel pump acting on a travel motor, a pressure regulating valve is present which is controlled by a machine control system, and said traction profile is stored in the machine control system.

8. The device according to claim 7 , wherein said pressure regulating valve is located between the input of said travel pump and a storage tank for hydraulic fluid.

9. The device according to claim 7 , wherein sensors for monitoring a direction switch and/or an accelerator pedal are provided which are connected at an output to said machine control system.

10. The use of a method according to claim 1 on a compacting machine for earth moving operations.

11. The use of a method according to claim 1 on a landfill compactor.

12. The method according to claim 1 , wherein the power train of the vehicle is the power train of a compacting machine used in earth moving operations.

13. A soil compressing machine for earth moving operations, comprising a power train which comprises an internal combustion engine and a travel pump,
wherein a control system is present which actuates the travel pump independently of the rotational speed of the internal combustion engine when a specified driving operation is to be carried out, and a specified control profile is stored in the control system, and
wherein the control profile selects predetermined periods of time based on typical accelerating and braking operations and also on forward and reverse movements during operation of the soil compressing machine, and
wherein the periods of time are adjusted such that during the succession of accelerating and braking operations within a typical period of time there is no rotational speed change,
and further wherein typical periods of time are determined dynamically, in that during operation, frequently repeated driving and accelerating operations and/or driving cycles are determined, from which the typical periods of time for the current operation are derived.

Assignees

• Bomag Gmbh

Inventors

• Laux Robert
• Loew Timo
• Hammes Manfred

Classifications

• B60W30/18045

  Rocking, i.e. fast change between forward and reverse · CPC title

• F16H61/431

  Pump capacity control by electro-hydraulic control means, e.g. using solenoid valves · CPC title

• F16H61/465

  for achieving a target input speed · CPC title

• B60Y2200/413

  Compactors · CPC title

• B60W2540/106

  Rate of change · CPC title