发明名称 |
Method for setting the working pressure of a transmission |
摘要 |
There is provided a method for setting an operating pressure of a transmission, the transmission having at least one of clutches, brakes, actuators, a hydrodynamic clutch, and a hydrodynamic converter, to which a medium conducting the operating pressure can selectively be applied, in order to vary a transmission ratio of at least one of a speed and a torque between a transmission input shaft and a transmission output shaft by opening and closing at least one of the clutches and the brakes, by actuating the actuators, and/or by a hydrodynamic power transmission using at least one of the hydrodynamic clutch and the hydrodynamic converter, wherein the operating pressure being switchable between a constant nominal value and a constant decreased value that is smaller in relation thereto, or the operating pressure being reducible in three or more steps or continuously from a nominal value to a decreased value. |
申请公布号 |
US8788161(B2) |
申请公布日期 |
2014.07.22 |
申请号 |
US201113580769 |
申请日期 |
2011.11.15 |
申请人 |
Voith Patent GmbH |
发明人 |
Hofig Bernhard;Gerlich Michael;Reik Michael;Wurster Christoph |
分类号 |
G06F7/00;F16H59/46 |
主分类号 |
G06F7/00 |
代理机构 |
Farjami & Farjami LLP |
代理人 |
Farjami & Farjami LLP |
主权项 |
1. A method for setting an operating pressure of a transmission, the transmission having at least one of clutches, brakes, actuators, a hydrodynamic clutch, and a hydrodynamic converter, to which a medium conducting the operating pressure can selectively be applied, in order to vary a transmission ratio of at least one of a speed and a torque between a transmission input shaft and a transmission output shaft by opening and closing at least one of the clutches and the brakes, by actuating the actuators, and/or by a hydrodynamic power transmission using at least one of the hydrodynamic clutch and the hydrodynamic converter, wherein the operating pressure being switchable between a constant nominal value and a constant decreased value that is smaller in relation thereto, or the operating pressure being reducible in three or more steps or continuously from a nominal value to a decreased value, the method comprising:
detecting a speed difference between the transmission input shaft and the transmission output shaft and/or between an input side and an output side of at least one of the clutches, the brake, the hydrodynamic clutch, and the hydrodynamic converter; comparing the speed difference to a predefined target difference; switching or reducing the operating pressure, the switching or the reducing being performed as a function of the comparing; wherein one or more variables describe a permissibility of the switching or the reducing and include:
a torque applied to the transmission input shaft;a torque applied to the transmission output shaft;a power applied to the transmission input shaft;a power applied to the transmission output shaft;a speed of the transmission input shaft and/or the transmission output shaft;a power supplied at a secondary drive of the transmission and/or a torque of a drive machine supplied there;a torque applied to a secondary output of the transmission and/or a power applied there; the method further comprising:
detecting an engine drag torque; andspecifying a limiting value for the engine drag torque describing the permissibility of the switching or the reducing, wherein the switching or the reducing is only performed upon detection of a variable describing the permissibility of the switching or the reducing below the limiting value, the limiting value being varied as a function of the comparing of the speed difference to the predefined target difference. |
地址 |
Heidenheim DE |