摘要:
A method for controlling pressure applied to a displaceable piston in a cylinder, piston displacement actuating a control element of an automatic transmission during a gearshift, includes determining whether piston displacement exceeds a free length of an isolation spring located between the piston and a friction plate of the control element; calculating the pressure using A the cross-sectional area of the piston; K a coefficient of a return spring extending between the piston and a reference position in the cylinder; x the piston displacement; F0 a pre-load of the return spring; xfree the free length of the isolation spring; and Kis a coefficient of the isolation spring; and applying the calculated pressure to the piston.
摘要:
A method for controlling the pressure of hydraulic fluid supplied within a transmission of a work vehicle. The method may generally include receiving a signal associated with a load condition of the work vehicle, determining a desired pressure for the hydraulic fluid supplied within the transmission based on the load condition and controlling a valve such that hydraulic fluid is supplied within the transmission at the desired pressure, wherein the transmission includes an input shaft, a counter shaft and at least two driven shafts extending parallel to the input and counter shafts.
摘要:
A process is described for application of pressure on setting mechanisms of transmission elements, e.g., band brakes or disk clutches, of an automatic transmission, particularly of the transmission system of a vehicle. In the process the control pressure applied to the setting mechanism is varied in dependence on the operating conditions. In order to eliminate transition errors and improve adaptation of the meshing behavior of the switching element, the slide of the switching element is regulated at a value adapted to the operating condition involved of the transmission and/or the vehicle. Apparatus for the implementation of the process is also described, as well as a hydraulic control system for supplying the operational chamber of a setting mechanism at a transmission element, which operational chamber has a continual leakage. In this regard, a valve device, by which the operational chamber can be rapidly filed by activation of the setting mechanism, is installed parallel to a rapid-response control valve, with which the pressure force of the transmission element parts can be influenced in a targeted manner. In this manner, it is possible for driver to feel a spontaneous reaction of the vehicle when activating the clutch or an autotmatic lever for switching between forward and reverse operation, without thereby detrimentally affecting the sensitivity and reaction time of the control valve.
摘要:
A method for controlling a manual transmission includes using a controller to determine a desired torque transmitted through an input clutch for the desired gear after a shift lever is moved to a desired gear position and while a clutch pedal is being released for engaging the clutch; inferring torque in the vehicle drive assembly; using inferred torque to determine clutch torque; and using the controller to automatically adjust a clutch actuator such that a difference between the desired torque and the inferred torque is reduced.
摘要:
A method of determining and reducing vibrations caused by a clutch (3) in a drivetrain (1) of a motor vehicle, in which the disturbing vibrations are detected by a control and regulating unit aided by suitable sensors and, if predetermined limit values are exceeded, at least one device is actuated by the control and regulating unit in such manner that the disturbing vibrations are completely eliminated or at least reduced in amplitude. At least one torque sensor (8, 9, 10) is used to detect the occurrence of vibrations in the drivetrain (1) and the torque sensor (8, 9, 10) is used to determine vibration amplitude.
摘要:
A control apparatus of automatic transmission controls by oil pressure at least one clutch of an automatic transmission connected to an engine output to be engaged or disengaged to make gear shifting. In this control apparatus, the output torque of the engine is calculated on the basis of a parameter representative of a load of the engine and the engine speed. In addition, a transfer torque necessary for the clutch is calculated by use of at least the calculated engine output torque and the engine speed. Then, a command value of oil pressure acted on the clutch is determined by the calculated transfer torque.
摘要:
In a work vehicle including a hydraulic clutch for a transmission system, the invention discloses an art of quickly yet shocklessly controlling the engagement of the clutch by properly judging a preliminary oil pressure condition and a half-clutched condition through a detection of torque developed in the transmission system.
摘要:
A method for controlling a clutch unit for a drive train of a motor vehicle, wherein the clutch unit comprises a wet-running friction clutch for controllably transmitting torque from an input element to an output element of the clutch unit, wherein the clutch unit comprises oil for cooling the friction clutch, wherein heat inputs which contribute to heating the oil of the clutch unit are calculated, heat outflows which contribute to cooling the oil of the clutch unit are calculated and, as a function of the heat inputs and heat outflows, a maximum admissible clutch torque is calculated, and wherein the current clutch torque of the friction clutch is limited to the maximum admissible clutch torque.
摘要:
Impeller speed, which is difficult to measure when a torque converter includes an impeller clutch, is estimated based on a known relationship among impeller speed, turbine speed, and turbine torque. Turbine torque may be directly measured by a turbine torque sensor or estimated based on other measurements such as output shaft torque or vehicle acceleration. The relationship is stored in a controller in terms of the coefficients of a second order polynomial relating turbine torque to impeller speed and turbine speed. A slip speed is calculated based on a measured input shaft speed and the estimated impeller speed. Closed loop control is used to adjust the impeller clutch torque capacity to maintain a target slip.
摘要:
A method for controlling a manual transmission includes using a controller to determine a desired torque transmitted through an input clutch for the desired gear after a shift lever is moved to a desired gear position and while a clutch pedal is being released for engaging the clutch; inferring torque in the vehicle drive assembly; using inferred torque to determine clutch torque; and using the controller to automatically adjust a clutch actuator such that a difference between the desired torque and the inferred torque is reduced.