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Method for magnifying torque at driveway of a motor vehicle using a clutch
| Details |
Inventors: Groene, Michael; Kreischer, Thomas; Leider, Eberhard; Weckenmann, Hartmut;
Assignee: DaimlerChrysler AG (Stuttgart, DE)
Primary Examiner: Wright; Dirk
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
In a method for magnifying torque during driveaway of a motor vehicle using a clutch, the driver-selected torque is dynamically magnified in time, and the enhancement component then is reduced down to 0 at increasing vehicle speed as a function of the latter. The driveaway behavior of a vehicle may be perceptibly improved, and an unintended shutoff of the internal combustion engine may be largely prevented when the accelerator pedal is operated too weakly or the clutch is engaged too fast. |
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DETAILED DESCRIPTION The driver-selected torque m.
sub.
F, specified by the driver via accelerator pedal 10, which represents the desired torque specified by the driver, together with the actual torque m.
sub.
ist, is added to a difference-forming step 11, by which a difference torque m.
sub.
d =m.
sub.
F -m.
sub.
ist is formed.
The difference torque m.
sub.
d is taken to a multiplier step 12 and is multiplied by a multiplication factor f.
sub.
v, so that, on the output side, a magnified difference torque m.
sub.
fh is formed.
Multiplication factor f.
sub.
v is formed by multiplication of a definable constant value f in a multiplication step 13 with the output signal of a function step 9.
Function step 9 forms a speed-dependent function which, at speed v=0 has a value of 1, this value then decreasing with increasing speed up to a speed such as 5 to 10 km/h, down to a value of 0.
This reduction may occur linearly or according to an arbitrarily specifiable function.
Thus, the multiplication factor f.
sub.
v has the value f at a speed v=0, and reaches a value of 0 at the selected limiting speed of 5 to 10 km/h.
In an adding step 14, the magnified difference torque m.
sub.
fh thus formed is added to the driver-selected torque m.
sub.
f, so that a magnified driver-selected torque m.
sub.
fv is formed.
This is passed on to a switch-over-step 15, as an alternative definition of a resulting selected torque m.
sub.
res, together with driver-selected torque m.
sub.
F.
The switching of switch-over step is effected by a comparison step 16, in which the driver-selected torque m.
sub.
F is compared to the actual value of the torque m.
sub.
ist.
Only when the actual value of the torque m.
sub.
ist is less than the driver-selected torque m.
sub.
F does a switch-over to the magnified driver-selected torque m.
sub.
fv occur, i.
e.
, only under this condition is this selected as the resulting selected torque m.
sub.
res for the formation of the actual engine torque as the setpoint value.
When the driver presses down accelerator pedal 10 in order to raise the engine torque for the driveaway of the vehicle, the driver-selected torque m
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Exercise Devices 
