US 6,205,388 B1Granted

Process to evaluate start-up for an automatic gearbox

AssigneeZF Friedrichshafen AG

InventorsMarkus Henneken, Wolfgang Schmid, Marko Poljansek

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Abstract

The invention relates to a process to evaluate start-up for an automatic vehicle gearbox, said process having the following steps: 1) a signal associated with an engine torque (M_M) or an engine speed (n_M) is emitted from an engine control device (27), and a signal associated with a torque (M_T) or a speed (n_T) of the turbine shaft (18) is emitted at the electronic gear control unit (11) by a measuring device (24) on a turbine shaft (18) of a converter (2) of the automatic gearbox (1); 2) the electronic gearbox control unit (11) determines a maximum value (Max) from time-related differences (DIFF(t)) between the engine torque (M_M) and the torque (M_T) of the turbine shaft (18) or the difference (DIFF(t)) between the engine speed (n_M) and the speed (n_T) of the turbine shaft (18); 3) a gear-change characteristic (SL) characterising a particular start-up style by comparing a theoretical driver-type value (FT_Soll_n) associated with the maximum (Max) with an actual driver-type value (FT_Ist) and the setting of a counter (39) is determined on the basis of the maximum value (Max) of the differences (DIFF(t)), said gear-change characteristic being meant to emit control signals to the hydraulic gearbox control unit (10).

Claims8

Dependent claims

A process for evaluating start-up in an automatic transmission of a vehicle via an electronic transmission control device having a calculation unit, a micro-controller, a memory device and a control device for controlling a hydraulic transmission control device, the process comprising the steps of:

issuing a signal associated with engine torque (M_M) and engine speed (n_M), from an engine control device (27) to the electronic control device (11), and issuing, a signal associated with one of a torque (M_T) and a speed (n_T) of a turbine shaft (18) from a measuring device (24) at the turbine shaft (18) of a converter (2) of the automatic transmission (1);
determining, via the electronic transmission control device (11), a maximum value (Max) of a time-related difference (DIFF(t)) between one of (a) the engine torque (M_M) and the torque (M_T) of the turbine shaft (18), and (b) the engine speed (n_M) and the speed (n_T) of the turbine shaft (18);
assigning an overall theoretical driver-type value (FT_Soll n) to the maximum value (Max) of the difference (DIFF(t));
comparing the overall theoretical driver-type value (FT_Soll_n) to an actual driver-type value (FT_Ist) and adjusting a counter (39);
and
determining from the counter (39) a specific gear change operating characteristic curve (SL) that characterizes a certain start-up style and issuing a control signal to the hydraulic transmission control device (10).

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/171,895Filed 28 Oct 1998
Priority: DE 196 18 81110 May 1996
Granted: 20 Mar 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F16H 61/0213
For gearshift control, e.g. control functions for performing shifting or generation of shift signal: characterised by the method for generating…
F16H 59/14
Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion: inputs being a function of torque or torque demand
F16H 59/36
Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion: inputs being a function of speed
F16H 2059/003
Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion: detecting or using driving style of a driver,…