Dry clutch control for automotive applications by Pietro J. Dolcini

By Pietro J. Dolcini

The convenience of a automobile as perceived via the driving force will be as very important to its advertisement good fortune as its functionality and gasoline potency. glossy engines carry elevated torque and there's a present pattern to minimize transmission-shaft stiffness, either phenomena militating opposed to conserving, not to mention expanding, experience comfort.

Dry grab regulate for car purposes analyses the keep watch over of part of the powertrain which has a key function in journey convenience in the course of standing-start and gear-shifting manoeuvres. The mechanical notion of a number of the parts within the driveline has lengthy considering been optimised so this booklet takes a extra holistic system-oriented view of the matter featuring:

  • a accomplished description of the driveline parts and their operation paying specific awareness to the take hold of;
  • a non-linear version of the driveline for simulation and a simplified version for keep an eye on layout, entire with a standing-start driving force automaton for closed loop simulation;
  • a certain research of the engagement operation and the similar convenience standards;
  • different regulate schemes aiming at assembly those standards;
  • friction coefficient and unknown enter seize torque observers;
  • practical implementation matters and recommendations in accordance with the hands-on adventure of enforcing optimum engagement options on Renault prototypes.

Dry seize keep an eye on for car functions should be crucial interpreting for car engineers engaged on version layout and includes a lot to curiosity the tutorial researcher with its blend of theoretical effects and alertness within the vital and greatly studied box of car engineering and control.

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Example text

1. 1a) Je Jg Jwl ,Jwr ωe ωg ωwl ,ωwr θtl ,θtr βd βtl ,βtr v Γe Γd engine inertia gearbox inertia left, right wheel inertias engine speed gearbox speed left, right wheel speeds left, right trans. torsion DMFW damping left, right trans. damping vehicle speed engine torque differential torque Jd Jtl ,Jtr M ωd ωtl ,ωtr θd kd (θd ) ktl ,ktr Rw α Γc Fxl ,Fxr DMFW secondary inertia left, right trans. inertias vehicle mass DMFW speed left, right trans. speeds DMFW torsion DMFW non-linear stiffness left, right trans.

Unfortunately, too strong a limitation can induce a very unpleasant feeling if the pedal does not stay in contact with the driver’s foot during a very fast release. For this reason the pedal speed is currently limited to 500%/s, a value only reached during extremely sportive driving or accidental maneuvers. e. has a good level of dosability. The shape of this curve is given by the interaction between the washer spring and the clutch disk’s flat spring. The washer spring is mainly designed to satisfy the required torque capacity and to minimize the force needed to open the clutch.

The second element, closely related to the first but valid for both MT and AMT vehicles, is the clutch ability of assuring a lurch-free engagement. The rest of this work will focus mainly on this aspect of the clutch comfort that is not only very important for the driving pleasure but contributes to the perceived quality of the vehicle. In order to better define the study subject, the use of the clutch during a standing-start and an upward gearshift is analyzed in detail. A downward gearshift has roughly the same structure as an upward shift but for some changes in the slipping speed and torque direction.

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