The maximum speed limit (HGB) has the amount of fuel depending on the current average driving speed fgmFGAKT abgeregeln. The of the
Maximum speed limit calculated amount mrmM_EHGB limits the desired quantity mrmM_EWUNF (see "External lot of intervention").
The maximum speed limit is composed of four sub-tasks: the
Evaluation of the request via the CAN messages Niveau1 and Allrad1, the Set-point tracking, the controller parameters selection and control.
fgm_VzuN Controller parameter
selection mrmM_EPWG mrmM_EFGR mroM_EBEGR fgmFGAKT Control MEREHG04 mrwM_EMAX mrmV_SOLHN mrmV_SOLEE = 0 mrmV_HGBSW Setpoint tracking mrwHGBvMAX = 0 > 1 & mrmHGB_Sta.1 mrmHGB_Sta.5 > 1 mrmM_EAKT + mrwM_HGB_d mrwM_NBHNI dzmNmit> mrwN_NBHNI
MIN Slew rate
Limit mrmM_EHGB & mrmHGB_Sta.2 mrmM_EAKT + mrwM_HGB_d mrwHGB_ABS mrwHGB_ANH mrmEXM_HGB mrwM_NBPNG dzmNmit> mrwN_NBPNG & mrmHGB_Sta.6
Figure MEREHG01: Structure of the German Commercial Code fgm_VzuN mroM_EBEGR mrmM_EPWG mrmM_EFGR fgmFGAKT mrmV_HGBSW
Driving speed ratio to speed Limiting amount
Wunschmenge_PWG Wunschmenge_FGR Current Speed Currently valid speed
The message is the mrmV_SOLEE on EEPROM set maximum. The
Setting the speed limit on EEPROM is accomplished via the fitting function of Diagnosis (see also chapter Diagnostics), Meßwertekanal 18 The top speed can
chosen within the limits mrwHGBvMIN minimum value and maximum value mrwHGBvMAX be. Each time you save the adjustment of the current value as the maximum value for which is next adjustments applied. Disabling the HGB and resetting of the maximum value
can only be done via the login function and password xcwPHGBOff. If the HGB disabled so are the values mrmV_SOLEE (maximum speed) and mrmV_SOLHN (tracking speed) = 0 When activated, is dependent on the Driving speed and the operating point of a tracking speed.
The current speed limit mrmV_HGBSW is the minimum of all active Requirements
-Limitation in the high-level: mrmHGB_Sta.1 = 1 means mrwHGBvHNI takes effect on the speed limit.
-Limitation in reduction by Planetennachgelege:
mrwHGBvPNG influences the speed limit. mrmHGB_Sta.5 means
-else: speed corresponding value from the EEPROM: mrmV_SOLEE. Application Note: a value of mrmV_HGBSW = 0 means for the control 'no Limitation '. Due to the minimum education above values of mrwHGBvHNI lead or mrwHGBvPNG = 0, means that even at mrmV_SOLEE equal to 0 no limit is performed.
The message mrmEXM_HGB indicates whether the HGB amount mrmM_EHGB influence on the Desired quantity mrmM_EWUNF has.
The slew-rate limiting prevents lot of jumps that the disabling Can occur through the speed limit or speed limit (see below). The
Parameters mrwHGB_ABS or mrwHGB_ANH give the maximum permissible level change for Lowering or raising of. The slew-rate limitation is only active when the amount active
is limited (mrmEXM_HGB = 1) as the effectiveness of the control of the state Disabled would otherwise be delayed (speed overshoot).
Secure deactivation of the HGB as EPROM (mrmV_SOLEE): mrwHGBvMIN = 0; mrwHGBvMAX = 0;
Erstinitialisierungswert for EEPROM edwINI_HGB = 0; Default value when defective EEPROM cowAGL_HGB = 0;
2.10.1 Evaluation of the request via Niveau1 and Allrad1 The requirements of the speed limit on Niveau1 and Allrad1 are Message mrmHGB_Anf summarized.
Description of HGB_Anf: Bit position 0 1 2 3 4
Decimal value meaning
1Anforderung a speed limit in the high-level Niveau1, byte 2, bit 7 'MSG constraint' 2Verbaucodierung - built engine in the Hunter Niveau1, Byte5, bit 4 'Vehicle level' 4frei
8frei
16Anforderung a speed limit reduction in by PNG
Allrad1, Byte1, bit 6 'speed limit'
If an implausibility between the internal state 'engine installed in the Hunter' diagnosed cowFUN_HUN and Verbaucodierung mrmHGB_Anf.1, the error fbbENIV_P reported.
The status of Höch's speed limit is summarized in mrmHGB_Sta. Description of HGB_Sta: Bit position 0 1 2 3 4 5 6 7 Decimal 1 2 4 8 16 32 64 128 Importance
HGB for HNI - activated HGB for HNI - active
HGB for HNI - Error while active reserved
HGB for PNG - activated HGB for PNG - active
HGB for PNG - Error while active reserved
Delete GRA setpoint
The setpoint of the GRA is cleared under the following conditions (mrmFG_SOLL = 0)
-
At the time of activation of a speed limit by external intervention
(Positive edge at mrmHGB_Sta.2 or mrmHGB_Sta.5) was the GRA-state neutral (MroFGR_SAT = 0)
-The requested speed (mrmV_HGBSW) is greater than the GRA setpoint (MrmFG_SOLL)
-The resumption of contact is actuated when activatable GRA. Toggle:
mroFGR_AB1 and mroFGR_AB2 masked (logical AND) with mrwHGB_AB1 and mrwHGB_AB2 are equal to 0
If the GRA setpoint is changed while the speed limit by set, this no longer cleared as a result.
The following conditions must be met in order limitation in the high-level is possible: the record label cowFUN_HUN (engine installed in the Hunter) is set to 1 there are no errors that prohibit the speed limit (fboSFGG,
fboSPWG)
-the vehicle speed is less than mrwHGBvHNI - mrwHGBdHNI If all conditions are met, the bit mrmHGB_Sta.0 is set, otherwise cleared.
If the bit is set mrmHGB_Sta.0, the Begrenzug in the high-level with the bit 'MSG Constraint '(Niveau1, byte 2, bit 7 = mrmHGB_Anf.0) are activated. In this case, the bit is set mrmHGB_Sta.1 and limits the speed to mrwHGBvHNI.
The limitation is deactivated by using bit 'MSG constraint' requirement is withdrawn. If at this point the speed will be actively limited
(MrmEXM_HGB = 1), the limit will not be disabled when mrmPWGfi for the period was mrwT_HGBLL smaller mrwHGB_PWG. As long as the limit is maintained, is mroHGBLLho set by the delay, otherwise cleared. The bit mrmHGB_Sta.1 resets with Deaktvierung.
If during the limitation (mrmHGB_Sta.1 = 1) errors that a Prohibit speed limit is in the state 'error while running'
(MrmHGB_Anf.2 = 1) passed. Now the speed (dzmNmit) is limited: above the Speed mrwN_NBHNI the default value is used mrwM_NBHNI. Below the
Limiting speed is equal mrmM_EHGB mrmM_EAKT + mrwM_HGB_d (HGB amount corresponds to the current amount plus cushion, since the two different quantities Calculating frequencies have). The speed limiter is disabled by using the bit 'MSG constraint' the request is withdrawn.
- - fbbENIV_Q fbbENIV_C fbbENIV_B fgmFGAKT <mrwHGBvHNI - mrwHGBdHNI cowFUN_HUN > 1 & mrmHGB_Sta.0 & fboSFGG fboSPWG fbbENIV_P > 1 > 1 mrmHGB_Sta.1 mrmEXM_HGB mrmPWGfi Switch-off Delay mrmHGB_Anf.0 mrmHGB_Sta.2 mroHGBLLho & & mrmHGB_Sta.1 > 1 & > 1 mrmHGB_Sta.2
The status of the speed limit in the high-level of the CAN message Motor7 sent: Signal Name Speed limit activated Speed limit active Byte 1 1 Bit 1 2 RCOS message mrmHGB_Sta.0 mrmHGB_Sta.1
Evaluation of the request via Allrad1
The following conditions must be met in order limitation in reduction by PNG is possible:
the record labels cowFUN_HUN (engine installed in the Hunter) and cowFUN_HAQ (Manual switch Quattro) set to 1
-there are no errors that prohibit the speed limit (fboSFGG) -the vehicle speed is less than + mrwHGBvPNG mrwHGBdPNG If all conditions are met, the bit mrmHGB_Sta.4 is set, otherwise cleared.
If the bit is set mrmHGB_Sta.4 that Begrenzug can at reduction by PNG with the bit 'Speed limit' (Allrad1, Byte1, bit 6 = mrmHGB_Anf.4) are activated. In
this case, the bit is set mrmHGB_Sta.5 and the speed to mrwHGBvPNG limited.
The limit is disabled by the bit about the 'speed limit'
Request is withdrawn. The bit mrmHGB_Sta.5 is at Deaktvierung reset.
If during the limitation (mrmHGB_Sta.5 = 1) errors that a Prohibit speed limit is in the state 'error while running'
(MrmHGB_Anf.6 = 1) passed. Now the speed (dzmNmit) is limited: above the Speed mrwN_NBPNG the default value is used mrwM_NBPNG. Below the
Limiting speed is equal mrmM_EHGB mrmM_EAKT + mreM_HGB_d (HGB amount corresponds to the current amount plus cushion, since the two different quantities Calculating frequencies have). The speed limiter is disabled by using the bit 'Speed limit' the request is withdrawn.
fbbEALR_Q fgmFGAKT <mrwHGBvPNG + mrwHGBdPNG cowFUN_HUN cowFUN_HAQ & mrmHGB_Sta.4 & & fboSFGG > 1 mrmHGB_Sta.5 & & mrmHGB_Sta.5 mrmHGB_Anf.4 & mrmHGB_Sta.6 > 1 mrmHGB_Sta.6
Figure MEREHG06: Request for reduction by PNG
2.10.2 Setpoint tracking
The speed setpoint mrmV_HGBSW for the maximum speed limit is
not directly output as controller setpoint to the controller, but in advance of the so-called Setpoint tracking manipulated. This function has the task of an under-or overshoot the filtered vehicle speed based on the fixed speed set point, according to
To avoid slope or hill climbing.
The setpoint tracking leads the setpoint for the controller "slow" (via a PT1 element) from the current velocity value approach to the desired or target value.
The setpoint tracking can assume three states (display in olda mroAKT_SWN): 1 ...
2 ... 3 ...
Released setpoint tracking Switched point tracking Off point tracking
v mrmV_HGBSW mrmV_SOLEE - mrwHGB_NAU mrmV_SOLHN fgmFGAKT mrmV_SOLEE - mrwHGB_NIS mrmV_SOLHN - mrwHGB_NAS t
switched released off released
Commercial Code governs
Figure MEREHG02: Setpoint tracking - Setpoint tracking enabled:
The setpoint tracking is enabled when the difference between the setpoint and Driving speed is greater than a threshold applicative.
(MrmV_SOLHN - fgmFGAKT> mrwHGB_NAS - released> Set Point Tracking) The tracking desired value mrmV_SOLHN is set to the desired value mrmV_HGBSW. Application Note:
The applicative mrwHGB_NAS threshold must be set larger than mrwHGB_NIS, otherwise, the state is "set point tracking enabled" no longer achieved.
- Setpoint tracking turned on:
The setpoint tracking is turned on when the difference between nachgeführtem Setpoint and the vehicle speed is less than or equal than a threshold applicative. (MrmV_SOLHN - fgmFGAKT <= mrwHGB_NIS -> Set Point Tracking turned on) The tracking desired value mrmV_SOLHN, starting with the current speed
fgmFGAKT is a PT1 element to the driving speed setpoint mrmV_HGBSW introduced. The PT1 mrwPT1_HGB running gear independently. The Output quantity mrmM_EHGB is limited to mroHGmax.
- Setpoint tracking off:
The setpoint tracking is switched off if the difference between the EEPROM set speed limit mrmV_HGBSW and the tracked target value
smaller is the same as an applicative threshold
(MrmV_HGBSW - mrmV_SOLHN <= mrwHGB_NAU) or is the controller limitation is less than a threshold applicative. (MroHGmax <mrwHGB_MAU)
The tracking desired value mrmV_SOLHN receives the value mrmV_HGBSW and the Setpoint tracking is turned off. The initial amount mrmM_EHGB is on
mroHGmax limited.
If the difference between mrmV_SOLHN - mrmV_HGBSW> mrwHGB_NAS replaced as the state of the setpoint tracking of released off after, or of
switched on after released.
Sollwertnach- released guidance mrmV_SOLHN = mrmV_HGBSW
Commercial Code does not regulate mroAKTSWN = 1 mrmV_SOLHN - fgmFGAKT > MrwHGB_NAS mrmV_SOLHN - fgmFGAKT <= MrwHGB_NIS mrmV_SOLHN - fgmFGAKT > MrwHGB_NAS Sollwertnach- off management mrmV_SOLHN = mrmV_HGBSW
Commercial Code governs mroAKT_SWN = 3 mrmV_SOLHN - fgmFGAKT <= MrwHGB_NAU or mroHGmax <mrwHGB_MAU Sollwertnach- switched management mrmV_SOLHN on PT1 to mrmV_HGBSW bring up
Commercial Code governs mroAKT_SWN = 2
2.10.3 Initializing the set value
The tracking desired value is initialized with the EEPROM value mrmV_SOLEE. 2.10.4 Controller parameters selection
Above the V / N threshold mrwHGB_VZN be for the PI controller, the parameter sets
mrwHP4_ ... mrwHI4_ ... (for courses <= 4th gear) or mrwHP5_ ... mrwHI5_ ... (for the 5th gear) selected.
2.10.5 HGB PI controller
The speed controller continuously calculates the allowable injection quantity to the Not to exceed speed limit.
mrmM_EADR mrmM_EPWG mrmM_EFGR mroM_EBEGR MAX MIN mroHGmax mrwM_EMAX mroHGP mroHGI mroHGB_RA PI CONTROLS HGB_Menge mrmV_SOLHN fgmFGAKT mrwHPx_ ... mrwHIx_ ... with x = 4 .. 5 mrmASGSTAT.13 & dimKIK > 1 mrwASG_BGR.1
Figure MEREHG04: regulation HGB ASG-ECO mode:
Basically, for this function, the HGB activated (mrwHGBvMAX equal to 0 and
mrmV_SOLEE equal to 0 or equal to 1 mrmHGB_Sta.1 mrmHGB_Sta.5 or equal to 1), see also safe deactivation of the Commercial Code.
The ASG-ECO mode can be used to reduce the consumption HGB. This Function is enabled via bit 1 of mrwASG_BGR (mrwASG_BGR.1 = 1).
If the ASG-ECO mode is enabled (mrmASGSTAT.13 = 1) and Kik-down is not actuated (DimKIK = 0) is switched to the values calculated from the HGB amount mrmM_EHGB. Is dimKIK = 1 or mrmASGSTAT.13 = 0 then the default amount mrwM_EMAX