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US 5,322,150 AGranted
Arrangement for controlling the slip of an automatic friction clutch
AssigneeFichtel & Sachs AG
InventorsHans-Joachim Schmidt-Brucken, Thomas Kuhn
Life of this patent
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AssigneeFichtel & Sachs AG
InventorsHans-Joachim Schmidt-Brucken, Thomas Kuhn
Estimating the term…
A slip control loop (13) is proposed which compares the actual differential speed between input and output speed of a friction clutch (5) of a motor vehicle with a desired differential value and adjusts a positioning drive (7) of the clutch (5) according to the desired differential speed. To increase the accuracy of control, a desired position signal from a clutch characteristic curve memory (25) is additively superimposed in the sense of an influencing variable on the desired position signal s' calculated by a controller (19) of the slip control loop (13). The clutch characteristic curve memory (25) stores the desired position signal s" as a function of the clutch moment which can be transmitted in this position and is addressed according to the instantaneous engine moment determined, for example, via an engine characteristic map (27). During a load change of the engine (1), the clutch (5) is adjusted to the expected moment before a significant change in the actual differential speed occurs. The controller (19) has an integrating controller property so that the integral portion of the desired signal s' is zero when the dimensioning of the clutch characteristic curve stored in the clutch characteristic curve memory (25) is corrected. A correcting device (33) allows step-wise correction of the characteristic curve as a function of the value of the integral portion.
An arrangement for controlling a slip of an automatic friction clutch (5) arranged between an engine (1) and gearbox (3) of a motor vehicle, comprising a positioning drive (7) adjusting the clutch (5) as a function of a desired position signal to a position defined by the desired position signal, a speed sensor (15) detecting a clutch input speed, a speed sensor (17) detecting a clutch output speed, slip controlling means (13) which produce the desired position signal as a function of an instantaneous difference between the clutch input speed and the clutch output speed detected by the speed sensors (15, 17) such that an instantaneous speed difference is equal to a predetermined desired speed difference, wherein said slip controlling means (13) is allocated a clutch characteristic curve memory (25) which stores the desired position signal in the form of a characteristic curve as a function of data representing a torque transmitted by the engine in the desired position, wherein the clutch characteristic curve memory (25) produces the desired position signal corresponding to a value of an instantaneous torque of the engine (1) determined by torque determining means (27, 29) and wherein said slip controlling means (13) superimposes the desired position signal of the clutch characteristic curve memory (25) on a control signal component produced by a controller (19).
An arrangement for correcting data which is stored in a data memory control, comprising:
Dependencies are inferred from the claim text.