US 12,434,760 B2
Apparatus for operating a load-controlled hydraulic supply of an agricultural tractor
Manuel Billich, Dornstadt (DE)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by DEERE & COMPANY, Moline, IL (US)
Filed on Mar. 21, 2024, as Appl. No. 18/611,783.
Claims priority of application No. 102023110913.8 (DE), filed on Apr. 27, 2023; and application No. 102023113309.8 (DE), filed on May 22, 2023.
Prior Publication US 2024/0359730 A1, Oct. 31, 2024
Int. Cl. B62D 5/07 (2006.01); B60T 13/18 (2006.01); B60T 13/68 (2006.01); F15B 11/16 (2006.01)
CPC B62D 5/075 (2013.01) [B60T 13/18 (2013.01); B60T 13/686 (2013.01); F15B 11/162 (2013.01)] 14 Claims
OG exemplary drawing
 
8. An agricultural tractor having an apparatus for operating a load-controlled hydraulic supply, comprising:
a hydraulic pump which is adjustable with respect to a displacement volume for supplying pressurized hydraulic fluid;
an actuator to adjust a pump swivel angle of the hydraulic pump;
a swivel angle sensor to detect the pump swivel angle;
a proportional valve having an electrical actuator;
a primary hydraulic consumer to carry out a superordinate hydraulic function and to be directly connected to a conveying outlet of the hydraulic pump;
a secondary hydraulic consumer to carry out a subordinate hydraulic function and to be connected to the conveying outlet of the hydraulic pump via the proportional valve;
a first pressure sensor to detect a system pressure at the conveying outlet of the hydraulic pump;
a second pressure sensor to detect a load pressure of the primary hydraulic consumer;
a third pressure sensor to detect a load pressure of the secondary hydraulic consumer; and
a control unit, including a processer and memory, configured to:
communicate with the actuator, the swivel angle sensor, the electrical actuator, the first pressure sensor, the second pressure sensor, and the third pressure sensor,
conclude a required power exceeds a conveying capacity of the hydraulic pump when the control unit recognizes the hydraulic pump is in an operating state indicating a maximum displacement volume by evaluating the pump swivel angle detected via the swivel angle sensor and the control unit recognizes a pressure difference between the system pressure detected via the first pressure sensor and a highest reported load pressure of the primary and secondary hydraulic consumers detected via the second and third pressure sensors falls below an admissible pressure difference, and
move the proportional valve into a closed valve position via the electrical actuator electrically actuated by the control unit when the control unit concludes the required power exceeds the conveying capacity of the hydraulic pump.