Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/04—Smoothing ratio shift
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/04—Smoothing ratio shift
  • F16H61/0403—Synchronisation before shifting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
  • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
  • F16H37/04—Combinations of toothed gearings only
  • F16H37/042—Combinations of toothed gearings only change gear transmissions in group arrangement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/04—Smoothing ratio shift
  • F16H61/08—Timing control
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/70—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/04—Smoothing ratio shift
  • F16H61/08—Timing control
  • F16H2061/085—Timing of auxiliary gear shifts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H2306/00—Shifting
  • F16H2306/40—Shifting activities
  • F16H2306/48—Synchronising of new gear
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/19—Gearing
  • Y10T74/19167—In series plural interchangeably locked nonplanetary units
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/19—Gearing
  • Y10T74/19219—Interchangeably locked
  • Y10T74/19251—Control mechanism

Definitions

• the present invention relates to a method for switching at least one transmission stage and / or at least one reduction stage in a jaw-connected transfer case in a drive train of a vehicle according to the closer defined in the preamble of claim 1.
• a jaw-connected, not synchronized transfer case is connected downstream.
• the transfer case for example, be carried out in two stages with a gear ratio as street gear and a reduction stage as off-road gear.
• the present invention is based on the object to propose a method of the type described above, in which the time of traction interruption is reduced to a minimum.
• the inherent in the circuit of the transfer case gear train interruption is reduced by means of the power shift to a minimum, is braked or accelerated by controlled braking or acceleration of the drive train in the power shift transmission, the output of the transmission to synchronous speed of the transfer case in the new gear, depending according to whether there is an upshift or a downshift.
• the shortening of the interruption of traction in upshifts without engine brake interventions and downshifts without speed specification on the engine is realized with the inventive method.
• an additional switching element for synchronizing a higher or lower gear is controlled in the transmission until the desired synchronous speed is reached.
• the choice of the switching element to be synchronized depends on the gear ratio to be switched or gear ratio.
• the transfer case in an upshift the transfer case can be switched from the reduction stage to neutral and then a switching element of a lower gear of the gearbox be controlled such that the Output speed of the gearbox is reduced by controlled bracing until the output speed of the transmission and the output speed of the transfer case are multiplied multiplied by the target ratio in the transfer case, so that the transfer case can be switched from neutral to the desired gear ratio.
• As part of the upshift can be a total of z. B of the fifth gear in the sixth gear, with the originally selected gear is preferably reduced by one or more ratios in the transmission and is switched in the transfer case from the reduction stage or low in the translation stage or high.
• z. B. in the gearbox several gear increments during the switching operation in the transfer case are carried out to realize other translations.
• a gear change in the drive train total z. B. from the sixth gear in the fifth gear whereby in the manual transmission, the originally selected gear is preferably increased by one or more gear ratios and is switched low in the transfer case from the translation stage or high in the reduction stage.
• z. B. in the gearbox several gear increments during the switching operation in the transfer case are carried out to realize other translations.
• Figure 1 is a schematic representation of a drive train of a
• FIGS. 2a to 2f show a shift upshift from a fifth gear step to a sixth gear step in the context of the method according to the invention, illustrated by different diagrams;
• the drive train of a vehicle illustrated by way of example in FIG. 1 comprises a drive motor, not shown further, which acts on a torque converter DW with a converter lockup clutch WK with an engine speed n_Mot.
• the torque converter DW is coupled to the input of a power-shiftable automatic transmission SG.
• the output of the gearbox SG is coupled to the input of a jaw-connected transfer case VG.
• the transfer case VG can be switched via a shift claw from a neutral position N either to a transmission ratio H (high) or to a reduction ratio L (low) in order to increase or decrease the output speed n_VG of the transfer case VG.
• the illustration of the drive train is only an example because the method according to the invention can also be used with other drive trains, possibly modified accordingly.
• the inventive method is exemplified on the one hand on the basis of a Switzerlandhochsciens ZH 5-6, starting from a fifth gear in a sixth Gear stage of the drive train and on the other hand based on a push downshift SR 6-5, starting from a sixth gear in a fifth gear stage of the drive train described by way of example.
• the drive pressure SE_WK of the lockup clutch WK is reduced to a minimum, as shown in FIG. 2e.
• the drive motor is decoupled from the further drive train, namely the manual transmission SG and in the transfer case VG.
• the manual transmission SG is briefly switched to the neutral position N, which can be seen in particular from Figure 2f.
• the drive pressure SE_2 of the second shift element which is assigned to the fifth gear in the manual transmission SG, is simultaneously reduced to a predetermined value.
• the drive pressure SE_3 of an additional third shift element which is associated with the fourth gear of the gearbox is increased to thereby clamp the gearbox SG and reduce the output speed n_SG of the gearbox SG, which can be seen in particular from FIG. 2c (t_development_n_vspann). This requires a time of about 0.2-0.4 s.
• the output speed n_SG of the gearbox SG is constantly compared with the value of the output speed n_VG multiplied by the target ratio i_VG of the transfer case VG.
• the drive pressure SE_2 and SE_3 of the second and third shift element is reduced to a minimum and the transfer case VG or the shift claw is switched from the neutral position N to the transfer stage H, which can be seen from FIG. 2d (t_claw_inclamping).
• t_claw_inclamping a time of about 0.1 -0.2 s is needed.
• the engine torque M_Mot can be released again and the AnSteuer für SE_3 of the required switching element can be increased depending on the engine torque M_Mot, so that the complete traction is available again. Subsequently, the control pressure SE_WK the lockup clutch WK for Close again increased. With the method according to the invention, the traction interruption for shifting the transfer case VG can thus be reduced to significantly less than 1 s.
• the manual transmission SG is in fifth gear prior to the shifting of the transfer case VG, while the synchronization is synchronized to decelerate or equalize the output rotational speed n_SG of the fourth and fifth gear in the manual transmission SG and after the shift of the Transfer case, the fifth gear of the gearbox SG is switched.
• the transfer case VG is located before the circuit in the reduction stage L and after the shift in the gear ratio H, so that a total of six gear stage results in the drive train before switching the transfer case VG a fifth gear and after the circuit of the transfer case VG.
• the second and fourth switching element is driven, which is illustrated by the corresponding courses of the drive pressures SE_1, SE_2 and SE_4, so that there is a brief acceleration of the output of the gearbox SG.
• the drive pressure SE_4 of the fourth shift element associated with the sixth speed of the transmission is increased to also increase the output speed n_SG of the transmission.
• the switching element associated with the fifth speed of the gearbox is prepared.
• the shift claw of the transfer case VG can be switched or retracted from the neutral position N in the reduction stage L, which can be seen in Figure 3d (t_Klaue_einfahren).
• the drive pressure SE_2 of the second shift element which is assigned to the fifth gear of the manual transmission SG, is continuously increased, so that the drive train is closed.
• the control pressure SE_WK of the lockup clutch WK is increased to close the same.
• the manual transmission SG is in fourth gear before the shifting of the transfer case VG.
• the sixth gear is used for acceleration or equal to the output speed n_SG ansynchroninstrument.
• the fifth speed of the shift transmission SG is switched.
• the transfer case VG is before the circuit in the translation stage H and after the circuit in the reduction stage L, so that a total of six times and in the drive train before switching the transfer case VG a sixth gear and after the shift of the transfer case VG results in a fifth gear.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Control Of Transmission Device (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=44069956

Family Applications (1)

Country Status (5)

Families Citing this family (13)

Family Cites Families (12)

• 2010
  • 2010-06-17 DE DE102010030242A patent/DE102010030242A1/de not_active Withdrawn
• 2011
  • 2011-05-04 WO PCT/EP2011/057112 patent/WO2011157477A1/de active Application Filing
  • 2011-05-04 EP EP11718715.3A patent/EP2583006A1/de not_active Withdrawn
  • 2011-05-04 KR KR1020127032731A patent/KR20130118740A/ko not_active Application Discontinuation
  • 2011-05-04 US US13/704,286 patent/US8869642B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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