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
  • F16H61/16—Inhibiting  or initiating  shift during unfavourable conditions , e.g. preventing forward-reverse shift at high vehicle speed, preventing engine overspeed  
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W2540/00—Input parameters relating to occupants
  • B60W2540/30—Driving style
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
  • B60W40/08—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to drivers or passengers
  • B60W40/09—Driving style or behaviour
• • 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
  • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
  • F16H2059/003—Detecting or using driving style of a driver, e.g. for adapting shift schedules
• • 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
  • F16H2061/0075—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 characterised by a particular control method
  • F16H2061/0096—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 characterised by a particular control method using a parameter map
• • 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
  • F16H61/16—Inhibiting  or initiating  shift during unfavourable conditions , e.g. preventing forward-reverse shift at high vehicle speed, preventing engine overspeed  
  • F16H2061/163—Holding the gear for delaying gear shifts under unfavorable conditions, e.g. during cornering
• • 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
  • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
  • F16H59/14—Inputs being a function of torque or torque demand
  • F16H59/141—Inputs being a function of torque or torque demand of rate of change of torque or torque demand
• • 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
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S477/00—Interrelated power delivery controls, including engine control
  • Y10S477/904—Control signal is acceleration
  • Y10S477/905—Acceleration of throttle signal

Definitions

• the invention relates to a method for controlling an automatic transmission of a motor vehicle in a spontaneous gas / pedal withdrawal according to the kind defined in claim 1.
• ETS electronic transmission control
• Modern automatic transmissions in motor vehicles are controlled by an electronic transmission control (EGS), which is used for the automatic selection of a stored shift program, which e.g. describes a driver type recognition known from the publication "ATZ Automobiltechnische Zeitschrift” 94 (1992), an environmental recognition, a driving situation recognition or a recognition of a manual intervention, and communicates with other control devices and computers of different units for the situation-dependent gear selection.
• EGS electronic transmission control
• Shifting characteristics which are stored in the electronic transmission control, determine the operating points at which the electronic transmission control issues a command to upshift or downshift to the hydraulics.
• the shift characteristics are usually shown as a function of a vehicle speed and a throttle valve position, the throttle valve position reflecting the position of the accelerator pedal, since the throttle valve is mechanically connected to the accelerator pedal in older versions and electronically in more modern versions.
• the opening cross-section of the throttle valve for reducing gas is reduced, with an upshift to a more economical gear, for example from third to fourth gear, being initiated at a sufficiently high vehicle speed.
• the upshifting characteristic curves of the control panel are recorded by the operating point resulting from the current driving speed and a throttle valve position.
• the position of the accelerator pedal is measured and converted into an accelerator pedal speed when the upshift characteristic is exceeded.
• the measured value of the accelerator pedal speed obtained in this way is compared with a limit value stored in the transmission control. If this limit is undershot, a switching signal is issued for upshifting.
• the accelerator pedal speed is therefore a measure of whether the transmission shifts up or remains in the previous gear.
• the upshifting process be suppressed if necessary when a lateral acceleration limit value is exceeded.
• the present invention has for its object to provide a method for controlling an automatic transmission of a motor vehicle in the case of a spontaneous gas / pedal release, with which an upshift prevention adapted to the driving situation is carried out, so that a delay in driving speed occurs and occurs simultaneously with the spontaneous pedal withdrawal there is the greatest possible spontaneity for subsequent acceleration.
• this object is achieved with a method according to claim 1.
• the state of the upshift prevention is advantageously activated not only as a function of a pedal position gradient, but also taking into account the sportiness of the driving behavior by the driver type evaluation payer and the detection of the overrun mode depending on the engine speed and road inclination.
• This enables precise gearbox tuning with a shift strategy that is appropriate to the situation and adapted to the environment, such as driving uphill or downhill, and to the driver type.
• Contributing to the accuracy of the method according to the invention in the case of a spontaneous gas / pedal withdrawal is that the state of the upshift prevention is only exited if several criteria essential for this are fulfilled.
• One of these exit criteria is that train operation must be clearly recognized by the electronic transmission control.
• limit values of the pedal position gradient and time limits as a function of the road inclination are checked as further exit criteria.
• the upshift prevention in accordance with the invention results in increased driving comfort and greater safety in critical driving situations such as e.g. an aborted overtaking.
• a third time is started if a negative pedal position threshold is undershot before the first time period has elapsed.
• the exit from the upshift prevention condition occurs here when pulling operation is recognized but falls below a negative pedal position gradient threshold.
• a third deceleration time is then started, which is dependent on the road gradient, i.e. Ascent or descent is limited. This ensures that a repeated negative pedal position gradient is taken into account and can delay the exit.
• Figure 1 is a schematic representation of a method for controlling an automatic transmission of a motor vehicle in a spontaneous gas / pedal release in a state diagram.
• FIG. 4 shows a course of the pedal position gradient according to FIG. 3 as a function of time, the state of the upshift prevention being maintained as a function of the pedal position gradient threshold and time limit shown in FIG. 3;
• FIG. 5 shows a profile of a pedal position gradient as a function of time, the state of the upshift prevention depending on a further pedal position gradient threshold, a further time limit and a lane is left.
• a method for controlling an automatic transmission of a motor vehicle in the event of a spontaneous gas / pedal withdrawal which is called "FastOff" is schematically illustrated, the automatic transmission being driven by an internal combustion engine which can be influenced by an accelerator pedal and having electronic transmission control in which a shift map is stored.
• 1 shows the structure of the method as a state machine, in which one state is always active. Each time the program is run, specific conditions are checked in the respective state. If one of these conditions applies, the current status is changed depending on the condition. If none of the conditions apply, the last state is run through again.
• state 1 there is no spontaneous gas or pedal return, which is why state 1 is referred to as "FastOff passive".
• the electronic transmission control recognizes that a variable indicating the state of the spontaneous pedal return Variable FFO (FastOff flag) is set to "0" and is therefore not fulfilled. Accordingly, the electronic transmission control does not issue an upshift prevention command.
• a current pedal position value PST is stored as pedal position value PST1 for state 1.
• the pedal position The PST value is calculated by the electronic transmission control from a signal of the throttle valve position which is proportional to the pedal position and is used as an output value for calculating a pedal position gradient PSTG.
• state 1 of the inactive upshift prevention it is queried whether the current pedal position gradient PSTG is smaller than a pedal position gradient threshold KF_PSTG [PST, COUNT] stored in a map as a function of the pedal position value PST and a driver type evaluation counter COUNT.
• the driver type evaluation counter COUNT is of a conventional type, e.g. in "ATZ Automobiltechnische Zeitschrift” 94 (1992), page 428 ff.
• upshift prevention is now active, it is checked in state 2a whether train operation is recognized by the current pedal position value PST being at or above a train-thrust characteristic curve KF ZS [NMO, FBN] dependent on an engine speed NMO and a road inclination value FBN and whether the ac - the current pedal position value PST is greater than the pedal position value PST1 upon detection of the spontaneous accelerator / pedal release “FastOff” plus an offset value KW_PST01.
• a first time T1 is started and the state 2b "wait for exit” is changed to a state 3, which is defined as the state for "prepare for exit” when the current pedal position value PST is on or is above the train-thrust characteristic curve KF_ZS [NMO, FBN] dependent on the engine speed NMO and the road gradient value FBN plus an offset value KW_ZSO, which represents an applicable variable.
• condition for a start of the first time T1 and for a change from the state 2b "waiting for exit” to the state 3 "preparing to exit” can also be set such that the current pedal position value PST is greater than the pedal position value PST2 at the time the detection of the spontaneous gas / pedal withdrawal must be "FastOff" plus an applicable offset value KW_PST02.
• the first time T1 is assigned a first limited time period THSVl for upshift prevention or upshift delay, the length of which is determined as a function of the road gradient value FBN, which is determined in a further module of the electronic transmission control.
• FIG. 2 shows the case in which the first time period THSV1 has expired and the pedal position gradient PSTG remains below a positive pedal position gradient threshold KW_PSTGPOS in the first time T1. If this is determined in state 3 “prepare exit”, then the system returns to state 1 of the deactivated upshift prevention, as can be seen in FIG. 1.
• Time period THSV2 has elapsed, as shown in FIG. 3, the system then switches to state 1, ie the upshift prevention is deactivated. If, however, the second period THSV2 has not yet expired and the pedal position gradient PSTG again exceeds the positive pedal position gradient threshold, as can be seen in FIG. 4, state 5 is repeated and the second time T2 is started again.
• state 3 is examined again, namely "prepare to exit", it can be seen in FIG. 1 and in particular in FIG. 5 that a third deceleration time T3 is started, to which a limited period THSV3 is assigned, which in turn depends on the road inclination value FBN, if the first time period THSVl has not yet elapsed and the pedal position gradient PSTG falls below a negative pedal position gradient threshold KW_PSTGNEG. In this case, from state 3 to another state 6, referred to in FIG. 1 as “no exit with a large negative gradient”, changed. The state of the upshift prevention is left here as soon as the third period THSV3 has expired.
• the first time T1 is started again if a negative pedal position gradient threshold KW_PSTGNEG is undershot before the first time period THSV1 has elapsed.
• the positive and negative pedal position gradient thresholds KW_PSTGPOS, KW_PSTGNEG are each in

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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ID=7885501

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (23)

Citations (2)

Family Cites Families (9)

• 1998
  • 1998-10-24 DE DE19849059A patent/DE19849059A1/de not_active Withdrawn
• 1999
  • 1999-10-16 EP EP99971072A patent/EP1123475B1/de not_active Expired - Lifetime
  • 1999-10-16 DE DE59902296T patent/DE59902296D1/de not_active Expired - Lifetime
  • 1999-10-16 US US09/807,910 patent/US6527672B1/en not_active Expired - Lifetime
  • 1999-10-16 WO PCT/EP1999/007873 patent/WO2000025046A1/de not_active Ceased
  • 1999-10-16 JP JP2000578579A patent/JP4429528B2/ja not_active Expired - Fee Related

Patent Citations (2)

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