Abstract:
A power machine (100) with an engine (130), a drive pump (210) driven by the engine, and a drive motor (220) operably coupled to the drive pump to receive a drive signal (211) and provide a motor output (222) to effect travel of the power machine is disclosed. A brake system (205) on the power machine includes a brake (270) for reducing or stopping movement of the power machine. A controller (250) receives indications of a braking condition and whether the drive pump is outputting the drive signal. The controller determines in response to receipt of the indication of the braking condition whether the drive pump is outputting the drive signal to the drive motor shuts down the engine if the drive pump is providing the drive signal to the drive motor upon receipt of the braking condition.
Abstract:
A method is provided for limiting a torque output associated with a power conversion unit (30). The method may include receiving data related to a pressure associated with an implement hydraulic cylinder (16), determining, based on the data, a desired torque value, wherein the desired torque value is below a predetermined threshold value associated with one or more drive train (11) components, and modifying a torque output associated with a power conversion unit to approximate the desired torque value.
Abstract:
The invention relates to a travelling mechanism, comprising a driving motor (24) which drives a feed pump (25) and a hydrostatic variable displacement pump (2), a zero fluctuating hydrostatic variable displacement motor (1) which forms a hydrostatic circuit with the hydrostatic variable displacement pump (2), and a hydrostatically driven 2-speed gear mechanism (11) which is switched when the torque to be transmitted is minimal and the hydrostatic variable displacement motor (1) is at zero absorption volume.
Abstract:
Offenbart sind zwei Varianten eines Verfahrens zum Anfahren - insbesondere aus dem Stand - eines Fahrzeugs, das einen Fahrzeugantrieb mit einem Verbrennungsmotor zum Antrieb eines ersten Rades oder einer ersten Achse und einen hydrostatischen Zusatzantrieb zum Antrieb eines zweiten Rades oder einer zweiten Achse hat. Der hydrostatische Zusatzantrieb hat eine vom Verbrennungsmotor angetriebene verstellbare Hydropumpe und zumindest einen daran hydraulisch gekoppelten Hydromotor. Die erste Variante des erfindungsgemäßen Verfahrens hat die Schritte: - insbesondere zunächst Erhöhen und - Regeln eines Versorgungsdrucks des zumindest einen Hydromotors in Abhängigkeit eines Fahrpedals; - Ermitteln einer Drehzahl ungleich null des ersten Rades oder der ersten Achse - insbesondere hinten -; und - Synchronisieren einer Drehzahl des zweiten Rades oder der zweiten Achse - insbesondere vorne - mit der ermittelten Drehzahl des ersten Rades oder der ersten Achse. Eine zweite Variante des erfindungsgemäßen Verfahrens betrifft das gleiche zuvor beschriebene Fahrzeug und hat die Schritte: - insbesondere zunächst Erhöhen und - Regeln eines Versorgungsdrucks des zumindest einen Hydromotors in Abhängigkeit eines Fahrpedals; - Ermitteln einer Geschwindigkeit des Fahrzeugs ungleich null; und - Anpassen einer Drehzahl des zweiten Rades oder der zweiten Achse - insbesondere vorne - an die ermittelte Geschwindigkeit. Offenbart ist weiterhin das entsprechende Fahrzeug, das einen Fahrzeugantrieb mit einem Verbrennungsmotor zum Antrieb eines ersten Rades oder einer ersten Achse und einen hydrostatischen Zusatzantrieb zum Antrieb eines zweiten Rades oder einer zweiten Achse hat. Der hydrostatische Zusatzantrieb hat eine vom Verbrennungsmotor angetriebene verstellbare Hydropumpe und einen daran hydraulisch gekoppelten Hydromotor. Ein Versorgungsdruck der Hydropumpe ist in Abhängigkeit eines Fahrpedals und weiterhin in Abhängigkeit einer am ersten Rad oder an der ersten Achse - insbesondere hinten - angeordneten Drehzahlsensorik oder Geschwindigkeitssensorik regelbar.
Abstract:
A manner of managing operation of a machine (100) is described for preventing damage/wear to movable machine components arising from operation of the machine/parts at excessive speed while the machine (100) is traveling down a steep incline. The managing of the machine operation includes determining a downhill slope value (THETA) in a machine direction of travel and then establishing a maximum commanded transmission output speed (max commanded motor speed) in accordance with the determined downhill slope value (THETA). Thereafter a maximum commanded gear ratio is established, for a transmission having a variable gear ratio, based upon the maximum commanded transmission output speed (max commanded motor speed) and a current engine speed. A controller compares the maximum commanded variable gear ratio to an operator requested gear ratio, and a target gear ratio is established for the variable gear ratio of the transmission based upon a minimum of the compared commanded variable gear ratio and the operator requested gear ratio.
Abstract:
In a gearbox unit (1) for insertion between a drive motor (47) and a user (48), consisting of a hydrostatic drive (2) changeable by means of an adjusting device (15a, 15b), a final, particularly mechanical gearbox (4) with several ratios (5, 6) and a control device to change the hydrostatic drive (2) by means of the adjusting device (15a, 15b) for a gear-changing process, the gearbox (4), is a synchronised drive with synchronising devices (7) for the ratios (5, 6), a device (UP, V2) to measure or monitor the drive torque (M) of the hydrostatic drive (2) is allocated to the control device (16) and, when the drive torque (M) is greater than the working torque of the relevant synchronisation device (7, 7a) before a gear-changing operation, the control device (16) sets a drive torque (M) on the hydrostatic drive (2) by means of the adjusting device (15a, 15b) which is the same as or lower than the working torque of the synchronising device allocated to the gear ratio (6, 7) concerned.
Abstract:
A stepless speed change gear for a vehicle enabling smooth starting of the vehicle in quick response to a stepped-on accelerator. This speed change gear intends to eliminate an undesirable starting action such as delay in response and subsequent abrupt starting specific to stepless speed change gear in general for low-speed and high-speed vehicles. For the above purpose, the stepless speed change gear is provided with a variable speed hydraulic transmission system comprising a variable volume type hydraulic pump/motor acting as a pump connected to another hydraulic pump/motor as a motor and, further, with an internal spool to vary a displacement volume of the hydraulic pump/motor acting as a pump, control piston, throttle changeover valve, circuit for detecting pressure difference in the hydraulic transmission system, potentiometer, and duty control valve. The spool undergoes negative feedback control by the duty control valve so that an effective pressure difference detected by a pressure difference detecting circuit may be kept at a set pressure corresponding to an angle of accelerator detected by accelerator angle detecting means.