Translation of "Anfahrdrehzahl" in English

For that purpose, the starting torque and the starting rotational speed have to be so chosen that as small as possible a power loss occurs at the clutch.

For that purpose, the starting torque and the starting rotational speed have to be so chosen that as small as possible a power loss occurs at the clutch.

The actuating fluid pressure for starting the vehicle at the appropriate diesel motor speed (starting speed) is adjusted with the choke or starting guide 15.

The advantage of the installation according to the present invention resides in that in contrast to the mechanically controlled centrifugal clutch, which operates with an engine rotational speed predetermined only by the mechanical system, the starting rotational speed can be predetermined by the drive pedal.

The rotary speed of the drive motor for the tool 1 is set to a starting rotary speed which is so low that, when the tool tip 7 comes into contact with the reference surface 10, the rotary speed of the drive motor becomes zero due to the frictional forces caused by this.

In this case, the rotary speed of the drive motor for the tool 1 is set to a starting rotary speed which is so low that, when the tool tip 7 comes into contact with the reference surface 5, the rotary speed of the drive motor becomes zero on account of the frictional forces caused by this.

As a result, it is achieved that, above the summit of the characteristic pilot control value curve, the clutch 2 is closed less intensely and therefore slips more again and the starting can therefore take place at a higher rotational starting speed and a higher engine torque.

The torque performance figure is changed by pivoting the guide wheel blades such that the starting speed at full load is low, the creeping moment at idle speed is small, and the speed ratio at which the coupling point occurs and overall efficiency are acceptable.

The setpoint engine speed n,eng,nom derived from the diagram in FIG. 3 corresponds to the starting rotational speed at the time t 1 (FIG. 2) at which the clutch begins to close (what is referred to as the contact point).

The method according to claim 1, further comprising the step of injecting additional compressed air into the air intake system (8) of the combustion engine (2) during a start procedure such that by an increased engine torque, a slippage time of the start and shift clutch (60) and a starting rotational speed of the combustion engine (2) is reduced.

It is also considered as advantageous, when provided, that injection of additional compressed air into the air intake system of the combustion engine takes place during a start procedure in such a way, that the slippage time of the start and shift clutch, as well as the start rotational speed of the combustion engine is reduced through an increased engine torque.

The typical method process for determining a startup gear as well as the startup torque and the startup speed of the drive engine can be found in DE 10 2007 019729 A1.

This can have the consequence that the startup torque necessary for startup is set with an engine speed (startup speed) that is too high, which causes an increased thermal and mechanical load of the friction clutch due to the high slipping speed.

Likewise, an engine speed (startup speed) that is too low for the startup can be set, with which the startup torque required for startup cannot be spontaneously generated by the drive engine such that either the startup procedure must be aborted, or a shift into a lower startup gear must occur during the startup, or the startup torque is achieved only greatly delayed with prolonging the slipping phase of the friction clutch.

With an active startup from standstill, which is triggered by the actuation of the gas pedal by the driver, and which occurs on a plane or an incline, the internal combustion engine, with an initially disengaged friction clutch, is controlled after the engagement of a determined startup gear in conjunction with the coordinated engagement of the friction clutch from the idle speed n idle to a startup speed n Anf and from the idle torque M idle to a determined startup torque M Anf until the motor vehicle has accelerated to the extent that the friction clutch runs synchronously and can be completely engaged.

The method according to the invention for the startup control now provides a direct consideration of the dynamic operating characteristics of the drive engine specifically in a manner such that the lowest possible engine speed n M, which can be set spontaneously under load from the idle speed n idle, and with which the drive engine can generate the determined startup torque M Anf, is determined and set as the startup speed n Anf .

The operation of drive-side power take-offs, in particular, can require the drive engine maintaining a maximum speed n max lying below the intended startup speed n Anf, (n max Source: EuroPat v2

EuroPat v2

In contrast, the method according to the invention is concerned with how, with a startup procedure from standstill triggered by the actuation of the gas pedal, the drive engine is controlled after the engagement of a determined startup gear in conjunction with a coordinated engagement of the friction clutch K, from the idle speed n idle to a startup speed n Anf and from the idle torque M idle to the determined startup torque M Anf .

According to the invention this occurs depending on the dynamic operating characteristics of the drive engine such that the lowest possible engine speed n M that can be spontaneously realized, and with which the drive engine can generate the determined startup M Anf torque, is determined and set as the startup speed n Anf .

Rotation speeds of the output shaft 3 between the maximum rotation speed and the starting rotation speed are reached by connecting the first hydrostatic motor 1 with the output shaft 3 via the first step reduction gear 2 or the third step reduction gear 22; and the first hydrostatic motor 1 is switched on or off via the electric actuating valve 9 and the second hydrostatic motor 4 via the electric actuating valve 26 .

Suitable measures that control unit 31 can initiate and monitor during altered clutch operation consist of the increase in the startup rpm, longer slip phases when starting and switching actions and/or the use of a slip regulating characteristic for clutch 4 that is set up especially for lower temperatures and has increased slip rpm.

The method according to claim 1, wherein in step (b), the clutch/gear control is adapted by increasing startup rpm.

The transmission of additional clutch energy to the gear oil in a preferred manner takes place by increasing the startup rpm, by prolonged slip phases when starting up, or by switching actions, or by switching over to a slip regulation characteristic that applies especially to low temperatures and that displays an increased slip rpm.

The starting speed of the power take-off shaft can therefore be applied within the lower speed range of an engine in which the torque is much lower than the nominal torque.

In addition, an injection of additional compressed air into the air intake system 8 of the combustion engine 2 during a start procedure can take place in a way that, through an increased engine torque, the slippage time of the start and shift clutch 60, as well as the start rotational speed of the combustion engine 2, is reduced.

For explosive starts, drivers can also activate Launch Control, which manages the engagement of the clutch at an optimum starting speed and minimum wheel slip.

The optimum start-up engine speed is set fully automatically and the SL 63 AMG accelerates away in an instant – as an option even up to the top speed.