摘要:
A method of controlling an internal combustion engine (14) having a power control 15) and a variable hydrostatic transmission (16, 17) including a hydraulic pump (16) driven by the internal combustion engine, and a hydraulic engine (17) connected therewith. By automatic adjustment of the power control (15) and the ratio (E) of the hydrostatic transmission (16, 17) independently of each other according to a predetermined mathematical control function (Fig. 1) which describes a desired relationship between power and rotational speed of the internal combustion engine, a specific discrete power output is delivered between zero load and full load only at an associated discrete rotational speed of the internal combustion engine.
摘要:
A control system is provided for a combine or other vehicle having an engine (30) for driving both the ground wheels (40) of the vehicle and at least one auxiliary mechanism (42), such as the crop-processing mechanisms of a combine. The engine is coupled to the ground wheels through a hydrostatic transmission (41) and the power takeoff (43) for the auxiliary mechanism is located on the engine side of the transmission. A speed droop governor (31) regulates the fuel input to the engine in response to changes in the engine speed. Transmission control means (44, 46, 45) adjusts the setting of the hydrostatic transmission, and thus the load applied to the engine via the transmission, in , response to changes in engine speed or another parameter that varies with engine load so as to control the speed changes effected by the droop governor. The combined effect of the speed droop governor and the transmission control means is to gradually reduce the operating speed of the engine as the fuel input to the engine is increased, with the total speed reduction over the full load range of the engine comprising from about 1% to about 5% of the no-load speed.
摘要:
Um ein Fahrzeug, insbesondere Zugfahrzeug oder Fahrzeug mit Nebenabtrieb, umfassend einen Verbrennungsmotor (20), mindestens eine von dem Verbrennungsmotor angetriebene Hydraulikpumpe (22;24) mit steuerbarem Fördervolumen, mindestens einen Hydromotor, welcher von der Hydraulikpumpe angetrieben ist, wobei der mindestens eine Hydromotor ein oder mehrere Antriebselemente des Fahrzeugs antreibt, ein vom Fahrer betätigbares Fahrpedal (34) zur Einstellung der Drehzahl des Verbrennungsmotors (20) in einem Straßenfahrt-Modus und eine vom Fahrer betätigbare erste Stelleinrichtung (36) zur Steuerung des Fördervolumens der Hydraulikpumpe in einem Arbeits-Modus, derart zu verbessern, daß es umfangreiche Steuerungsmöglichkeiten aufweist, wird vorgeschlagen, daß eine zweite Stelleinrichtung (50) an das Fahrpedal (34) gekoppelt ist, welche über das Fahrpedal betätigbar ist und mit der im Arbeits-Modus das Fördervolumen der Hydraulikpumpe steuerbar ist.
摘要:
A system 10 and method for controlling a multiple cylinder internal combustion engine 14 include determining a driver-demanded torque, determining a first torque based on the driver-demanded torque and a torque converter model, and determining a second torque based on an engine speed error between a current and target engine speed multiplied by a calibratable gain factor based on the speed ratio of the torque converter. The engine 14 is then controlled to deliver the sum of the first and second engine torques to improve system response to part-throttle acceleration requests, particularly for vehicle launch and drive away.
摘要:
A control system (16) for a utility vehicle transmission provides for operator selection of vehicle "aggressiveness," or rates of acceleration in response to operator command. The aggressiveness of a vehicle's performance can be controlled by modulating control signals to proportional control valves, which determine the transmission acceleration, according to two or more electrical ramp-up (or ramp-down) profiles, in response to an operator's acceleration command (or deceleration command). The transmission control system (16) includes a controller (52), directional switches and electro-hydraulic valves (106, 108) which control hydraulic pressure in the servo control system of a hydrostatic transmission (26). The operator is provided with a two-position set switch (56). With the set switch (56) in the less aggressive position, in response to an operator's command, the software in the controller (52) provides a relatively slow current ramp to energize the control valves (106, 108). With the switch (56) in the more aggressive position, the current ramps and resultant pressure ramps are faster, thus causing more aggressive transmission operation for the hydrostatic transmission (26).
摘要:
The invention relates to a drive train control for the overall control of the drive motor and transmission of a vehicle or self-driving mobile machinery with a drive motor having a speed regulator and a continuously variable transmission with transmission ratio control. Both transmission ratio and engine speed are regulated by the drive train control which can be actuated by an accelerator pedal (1). The accelerator pedal controls the specified power output of the engine and the transmission ratio of the continuously variable transmission is adjusted in accordance with said specified power output. This allows for torque-controlled driving in push-pull mode.
摘要:
Whether the running condition or the working condition is discriminated, when the running condition is discriminated, the highest RPM of a prime mover is limited by a 1st RPM, and the maximum displacement value by a 1st volume value, and, when the working condition is discriminated, the highest RPM is limited by a 2nd RPM equal to or lower than the 1st RPM and the maximum displacement volume is limited by the 2nd volume value larger than the 1st volume value. The 1st and 2nd RPM's and the 1st and 2nd volume values are determined to satisfy the relation, (1st RPM x 1st volume value at least at the flat land running pressure)
摘要:
A drive unit consists of an internal combustion engine (1) and a continuously variable branching transmission comprising a steplessly variable hydrostatic motor-pump unit (4) and a summarizing gearbox (10) with connected sector gears (12, 13) for successive transmission sectors. In order to permit the operation of said drive unit even at operating points in an interval containing the change-points, the hydrostatic unit (4) is first continuously controlled as far as the changing point at a constant revolution speed of the engine, whereupon the clutch allocated to the next sector is closed and the desired speed is set and maintained by changing the engine revolution speed.
摘要:
A control device for a hydraulically propelled work vehicle according to the present invention comprises an engine revolution speed control means (360) which controls the revolution speed of an engine (21); a variable displacement type hydraulic pump (1) which is driven by the engine (21); a displacement variation means (40) which varies the displacement of this variable displacement hydraulic pump (1); a displacement control means (160A) which determines a target displacement according to the operational state of the pump (1), and drive controls the displacement variation means (40); and, a hydraulic motor (4) for vehicle propulsion which is driven by hydraulic fluid ejected from the variable volume type hydraulic pump (1). There is further provided a slope descending detection means (52) which detects when the vehicle is descending down a slope, and, when it is detected by this detection means that the vehicle is descending down a slope, along with a means for engine revolution speed control (360) lowering the revolution speed of the engine (21), a displacement control means (160A) limits the maximum displacement of the hydraulic pump (1) to a value higher than during vehicle propulsion on level ground at a constant speed.
摘要:
The system comprises a hydraulic pump (1) driven by an engine (21); a hydraulic motor (4) for running, driven by oil discharged from the hydraulic pump (1) during running; an actuator (52) for working, driven by oil discharged from the hydraulic pump (1) during working; a running pedal (6) for controlling a running speed in accordance with a manipulated variable during running; a reduced speed determining means (33) for determining the reduced depression of the running pedal (6); and a revolution frequency controller (33). The revolution frequency controller (33) performs a regular control for increasingly or decreasingly controlling the revolution frequency of the engine in accordance with the depth of the depression of the running pedal (6), and slow-down control for decreasingly controlling the revolution frequency of the engine to match the reduced depth of the depression when the depth of the depression is determined to be reduced. Then, when the revolution frequency of the engine is to be adjusted by the running pedal (6) during working, even if the depth of the depression of the running pedal (6) is reduced, the slow-down control is prohibited.