Drive train for a mobile vehicle and method for the control of the drive train
AssigneeZF Friedrichshafen AG
InventorBernd Aumann
Life of this patent
Estimating the term…
Abstract
In a drive train for a working machine, in particular, a wheel loader, the driving speed is preselected via a driving pedal (11) and the working hydraulic system is actuated via a selector lever (8), whose signals are fed to an electronic control unit (10) which regulates a drive engine (1) and a clutch (2) arranged between the drive engine (1) and a pump impeller (3) of a hydrodynamic torque converter in such a manner that an auxiliary drive (6) for a pump (7) of the working hydraulic system is operated at a sufficient speed, while the preselected driving speed is not exceeded.
Claims8
A drive train for a mobile vehicle comprising:
- a drive engine (1) for driving both a shiftable step-down transmission (5), for driving a propulsion drive, and an auxiliary drive (6), for driving a hydraulic pump (7) of a working hydraulic system;
- a hydrodynamic torque converter coupling the drive engine (1) to the shiftable step-down transmission (6) and a converter bridging clutch (2) releasably coupling a pump impeller (3) of the hydrodynamic torque converter to the drive engine (1);
- and
- an electronic control unit (10) for receiving a signal from a selector lever (8) and controlling operation of the working hydraulic system and receiving a signal from a driving pedal (11) and controlling operation of the propulsion drive, and the electronic control unit (10) controlling the drive engine (1) and the clutch (2) to establish a driving speed of the propulsion drive and a speed of the auxiliary drive (6) dependent upon varying positions of the driving pedal (11) and the selector lever (8);
- and
- when the drive engine (1) is operating at maximum power, the clutch (2) is engaged and the selector lever (8) is then actuated, the clutch (2) is actuated in a disengaging direction and the drive engine (1) is regulated so that the auxiliary drive (6) reaches a defined speed and b driving speed of the propulsion drive is dependent upon the varying positions of the driving pedal (11) and the selector lever (8) and is reduced as the driving resistance increases.
A method for controlling a drive train of a mobile vehicle having a drive engine (1) driving both a shiftable step-down transmission (5), via a hydrodynamic torque converter, and an auxiliary drive (6), for powering a hydraulic pump (7) for a working hydraulic system, and a converter bridging clutch (2) releasably engages a pump impeller (3) of the hydrodynamic torque converter with the drive engine (1) for driving a propulsion drive, the method comprising the steps of:
- sending a signal from a selector lever (8), for controlling operation of the working hydraulic system, and sending a signal from a driving pedal (11), for controlling a speed of the propulsion drive, to an electronic control unit (10);
- controlling the drive engine (1) and the clutch (2), via the electronic control unit (10), to establish a driving speed of the propulsion drive and a speed of the auxiliary drive (6) dependent upon varying positions of the driving pedal (11) and the selector lever (8);
- and
- when the drive engine (1) is operating at maximum power, the clutch (2) is engaged and the selector lever (8) is actuated, actuating the clutch (2) in a disengaging direction and regulating the drive engine (1)80 that the auxiliary drive (6) reaches a defined speed and a driving speed of the propulsion drive is dependent upon the varying positions of the driving pedal (11) and the selector lever (8) and is reduced as the driving resistance increases.
A method for controlling a drive train of a mobile vehicle having a drive engine (1) driving both a shiftable step-down transmission (5), via a hydrodynamic torque converter, and directly driving an auxiliary drive (6), for powering a hydraulic pump (7) for a working hydraulic system, and a converter bridging clutch (2) releasably engages a pump impeller (3) of the hydrodynamic torque converter with the drive engine (1) for driving a propulsion drive, the method comprising the steps of:
- sending a signal from a selector lever (8), for controlling operation of the working hydraulic system, and sending a signal from a driving pedal (11), for controlling a speed of the propulsion drive, to an electronic control unit (10);
- controlling the drive engine (1) and the clutch (2), via the electronic control unit (10), to establish a driving, speed of the propulsion drive and a speed of the auxiliary drive (6) dependent upon varying positions of the driving pedal (11) and the selector lever (8);
- and
- when the drive engine (1) Is operating at maximum power, the clutch (2) is engaged and the selector lever (8) is actuated, actuating the clutch (2) in a disengaging direction and regulating the drive engine (1) so that the auxiliary drive (6) reaches a defined speed and a driving speed of the propulsion drive is dependent upon the varying positions of the driving pedal (11) and the selector lever (8) and is reduced as the driving resistance Increases.
Dependencies are inferred from the claim text.