Vehicle control system

Patent metadata

Field	Value
Publication number	US-9706696-B2
Application number	US-201414581041-A
Country	US
Kind code	B2
Filing date	Dec 23, 2014
Priority date	Dec 23, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A control system for a tractor that controls an operating condition of an attached implement and includes a pressure sensing device which senses the pressure in the hydraulic drive circuit and provides a signal indicative of the pull force necessary to pull the implement. The control system further includes a control device which receives the pressure signal and a second signal relating to the speed of the tractor and adjusts the position of the implement to a position within a pre-determined range in order to prevent damage to the tractor or implement.

First claim

The invention claimed is:

1. A control system for a tractor having a transmission with a hydraulic drive circuit in which a hydraulic pump supplies pressurised fluid to a hydraulic motor, wherein said control system controls an operating condition of an implement attached to the tractor, wherein said control system comprises:
a pressure sensing device which senses the pressure in the hydraulic drive circuit and provides a signal which is indicative of the current pull force necessary to pull the implement; and
a control unit which receives the pressure signal and a second signal relating to the speed of the tractor and adjusts the current position of the implement to a new position when said pressure signal varies, characterized in that the new position lies within a pre-determined position range dependent on the second signal in order to limit the vertical displacement of the implement under changing operating conditions.

2. The control system as claimed in claim 1 wherein the higher the speed of the tractor, the narrower the pre-determined position range is.

3. The control system as claimed in claim 1 wherein the pre-determined position range is effected when attachment of the implement is detected.

4. The control system as claimed in claim 1 wherein the new position of the implement is effected by controlling movement of a linkage to which the implement is attached.

5. The control system as claimed in claim 4 wherein the linkage is a three point linkage.

Assignees

• Agco Int Gmbh

Inventors

• Gschwendtner Christian

Classifications

• A01B63/112 Primary

  to control draught load, i.e. tractive force · CPC title

• A01B63/1006

  the hydraulic or pneumatic means structurally belonging to the tractor · CPC title

• A01B63/22

  operated by hydraulic or pneumatic means · CPC title

• F16H61/47

  for achieving a target output speed · CPC title

• F16H61/425

  Motor capacity control by electric actuators · CPC title