DE10302503A1 - Gearbox control method for a motor vehicle's drive train uses different gearshift modes selected by relying on a driver's optional advance setting - Google Patents

Abstract

Gearshift modes (INIT,PRN,NORMAL,TIPP,SPORT,BG,WINTER) selected by a driver each have a gearshift program to adjust a speed increasing ratio in an automatic gearbox. The gearshift modes represent control modules separated from each other. A change from one mode to another is carried out by means of a predefined transitional function adapted to a current operating condition in a drive train.

Description

The invention relates to a method for controlling a transmission of a motor vehicle drive train, which different depending selectable according to a driver request Switching modes includes.

WO 01/50039 A1 describes a method for Control of an element of a drive train of a vehicle and a control unit for performing the method is known. The element of the drive train can be influenced by an operating means. The The element and the controls are in different versions executable, being in a storage means for at least each variant of the operating means and the element an identifier is stored.

Any variant of the drive train element becomes dependent the corresponding identifiers are controlled by the control unit, being different states an identifier is assigned to a specific variant of the element is. The identifiers contain control information in a control unit be evaluated. The evaluations of the tax information are used to control the element.

As operating means are from Vehicles known in practice so-called driver control panels or so-called Transmission control panels provided, which u. a. as a selector lever, be designed as a program button and as a rocker switch on a steering wheel can. With these controls, a driver can specify a driver request Control gear selection in a transmission. Depending on one over the the above-mentioned control means made driver request specification Prioritization between different switching modes. Within of a selected one Shift mode, a gear selection is determined, the selection in turn with the help of long and short-term functions of the transmission.

This is done in WO 01/50039 A1 Gear selection with the help of tables, the values of which different switching functions or represent switching programs. One depending value of these tables read from a current operating state a requirement if and in what way a gear is engaged or a translation is set in the transmission.

The disadvantage, however, is that the transition from one switching mode to another switching mode predefined static control parameters is carried out and the different Switching modes as well as the corresponding control of a transmission are interconnected such that an implementation of a new switching module and a software implementation such a requirement is complex and complex.

The present invention lies hence the task, a clear and easily expandable method for controlling a transmission of a motor vehicle drive train to disposal to set, with the control parameters for controlling a transmission while a change between two switching modes dynamically to a current one Operating situation of the drive train are adaptable and in the simple Way other switching modes can be implemented.

According to the invention, this object is achieved with a Procedure according to the characteristics of claim 1 solved.

With the method according to the invention for controlling a transmission of a motor vehicle drive train, which different depending Selectable switching modes according to a driver's request comprises is a change from one switching mode to another switching mode carried out by means of at least one predefined transition function. In order to there is a clear and easily expandable procedure available with the control parameter for dynamic control of an automatic transmission to current operating conditions adaptable are.

The transmission can for example as automatic transmission, CVT, automated manual transmission or Double clutch gearbox executed his.

The dynamic adjustment of the control parameters, the clarity and the simple expandability of the method are achieved in that the switching modes are designed as separate control modules, which over the at least one predefined transition function linked together are. So that can other modular switching modes in a simple manner added be that over which already has at least one predefined transition function existing switching modes of the method for implementation in the Tax system linked become.

The switching modes of the method according to the invention are advantageously as states a state machine, in the transition between the switching modes through the transition function are clearly defined and their condition is clearly defined at all times is.

Other advantages and beneficial Refinements of the subject matter according to the invention result from the claims and that described in principle with reference to the drawing Embodiment.

It shows:

1 the method according to the invention in the form of a state diagram in which switching modes are shown as individual states of a state machine and

2 a highly schematic graphic representation of a driver type assessment.

1 shows a state diagram of a method for controlling an automatic transmission of a drive train of a vehicle, which includes various shift modes "INIT", "PRN", "NORMAL", "TIPP", "BG", "SPORT" and "WINTER" that can be selected as a function of a driver's request which have various switching programs, not shown, for setting a translation in the automatic transmission. The switching modes "INIT" to "WINTER" represent separate control modules or so-called states of a state machine, which are implemented in software in an electronic transmission control unit.

There are different between the individual switching modes "INIT" to "WINTER" Links or transition functions provided, which is represented schematically by arrows graphically are. Finds depending a switch between two switching modes instead of a driver request, this change becomes clear using the predefined transition functions and clearly the current operating state of the drive train carried out adapted.

The driver request for activation or to choose a switching mode can exist over a certain position the selector lever, like for example, the selector lever position limit "BG" or a tip alley for the Selector lever, one Winter button, a sports button or a steering wheel rocker switch (+/-) carried out become.

The through the in 1 Changes between the switching modes "INIT" to "WINTER" indicated by arrows refer to the specification of control parameters "AB" and "GT" one in 2 driver type evaluation shown in a very schematic 2 , The numbers following the reference symbols "AB" and "GT" each denote the different basic driver types and the adaptation ranges within which dynamic adaptation of the driver type is carried out. The identification of the control parameter "AB14" means that when changing from the "NORMAL" switching mode to the "TIPP" switching mode, an adaptation over the adaptation range between the basic type 1 and the basic type 4 is carried out, and the specification “GT1” for the control parameter “GT” gives the basic driver type for the jogging mode 1 in front.

When the vehicle is started up, the "INIT" switching mode is activated first, while the state diagram in 1 initialized state machine graphically displayed. After initialization, the system then automatically switches to the "PRN" switching mode. In the "PRN" switching mode, operating states of a vehicle are depicted that are present when a vehicle is started up. In the present case, these are the operating states parking "P", in which the downforce of a vehicle is blocked by suitable devices, reverse gear "R", in which a reverse gear is engaged in the automatic transmission, or neutral state "N", in which a power flow between an engine of the vehicle and the output is interrupted essentially in the area of the transmission. These operating states are selected by a driver, for example using a selector lever.

If a driver transfers the selector lever from one of these selector lever positions to a selector lever position "D", in which preferably several forward gears or the complete transmission range of the automatic transmission are available for forward travel, the "NORMAL" shift mode is activated. The control parameters "AB" and "GT" of the driver type evaluation 2 set to its start value, the start value of the control parameter "AB" being zero and the start value of the control parameter "GT" being two.

The control parameter "AB" in the present case represents an adaptation area of the driver type evaluation 2 represents a driving behavior of a driver is adaptively taken into account during operation of the vehicle. That is, the value of the control parameter "AB" is changed during the operation of the vehicle depending on the driving style of a driver. The further control parameter "GT" of the driver type evaluation 2 represents the specification of a so-called basic type of driver, which is set or specified statically depending on the activated switching mode "INIT" to "WINTER". The control parameter "GT" in the present case assumes the specified values "0", "1", "2", "3" and "4". A very economical driving style of a driver is assigned to the value "0" and the value "4" represents a very sporty driving style of a driver.

The control parameter "AB" can have values between Accept 0% and 100%. About that There is also an adaptation range within which the value of the control parameter "AB" is adaptive to the driving behavior of a vehicle Driver adjusted becomes, predeterminable. For example, a specification "24" sets a limit for the control parameter "AB" of the adaptation area for the control parameter "AB" between the values of the control parameters "GT" represents "2" and "4". If a driver's driving style an adaptation of the control parameter "AB" in would cause the range between the values "0" and "2", an adaptation of the Control parameter "AB" in this area by default "24" prevented from entering.

The range of values of the control parameter "AB" is one for identifying a degree Sporty driving style of the driver is provided, the value 100%, which corresponds to the value "4" of the control parameter "GT", characterizing a very sporty driver, and by the partial range between 0% to 30%, which corresponds to the range between the values " 0 "to approximately" 2 "of the control parameter" GT ", in the present case the driver on the control system side is represented with a more economical driving style.

The driver type rating is like this executed that the Control parameter "GT", via which the Basic type of driver depending of the activated switching mode "INIT to WINTER" is specified for different Switching modes compared to the Adaptation area for the driver type rating, d. H. the control parameter "AB" is prioritized. Thus, the control parameter "GT" is, for example a change from the "NORMAL" switching mode to the "SPORT" switching mode from its start value "2" to the value "3" and a control of the automatic transmission in dependence on this permanently set Basic type carried out.

The control of the automatic transmission then takes place independently from the current value of the adaptation area or of the control parameter "AB", the adaptation area by switching from the "NORMAL" switching mode to the "SPORT" switching mode initially to the area "2 limited to 4 " becomes. The control parameter "AB" is within this Areas during of operation over a Adaptation routine adaptive to the current driving behavior of the driver customized, although this is in the switching mode "SPORT" due to the above Prioritization of the control parameter "GT" has no effect on the control of the automatic transmission.

The adapted value of the adaptation area "AB" is then either transferred directly to another switching mode or when changing to another switching mode to the new switching mode in a predefined Adapted way.

The two control parameters "AB" and "GT" are specified here each over so-called transition functions, which are also independent Control modules represent the software side in an electronic Transmission Control Module are implemented.

With the above-described adaptation method of the control parameter "AB" and the specification of a value of the control parameter "GT" of the driver type evaluation 2 , depending on a respectively current combination of a selector lever position and an actuation of the buttons described above for a driver request specification, the control of the automatic transmission is influenced dynamically. In addition, it is provided that the adaptation process is deactivated when the control parameter "AB" of the driver type evaluation is set to zero. It is also possible for the driver to select a particularly sporty adaptation, the control parameter "AB" always taking values of over 30% in this mode.

Furthermore, when changing from the "TIPP" switching mode to the "NORMAL" switching mode via a transition function, the driver type evaluation is carried out 2 a blocking time "TS" is started, within which it is checked whether the driver wants to switch from the "TIPP" switching mode to the "NORMAL" switching mode or to another switching mode. If the driver changes from the "TIPP" switching mode to the "BG" switching mode within the "TS" blocking time, the "NORMAL" switching mode is not started, and the "BG" switching mode is activated immediately after the "TS" blocking time has expired. However, if the driver switches from switching mode "TIPP" to switching mode "NORMAL", the latter switching mode is activated after the blocking time "TS".

In addition to the driver type rating and the activation of the blocking time "TS" it in a no closer variant of the method according to the invention provided be that when changing between two switching modes "INIT" to "WINTER" as a transition function selected a special driving program is used to perform certain controls of the automatic transmission can. It can u. a. be provided that when changing from that Switching mode "NORMAL" in the direction of Switching mode "SPORT" a special driving program is selected, via which downshifts be forced in the automatic transmission, since downshifts in the "SPORT" switching mode are otherwise initially would take place at the same speeds as in the "NORMAL" switching mode. With this special driving program become downshift characteristics which are at lower speeds than this in Switching mode "NORMAL" is the case.

Furthermore, each switching mode is "INIT" to "WINTER" with a prioritization in terms of of the various switching programs that ultimately run one Proposal to set a specific gear ratio in the automatic transmission represent. The prioritization is dependent in each of the switching modes an operating state-dependent translation request carried out, being between different for the respective switching mode characteristic switching functions Switching function selected which is the highest priority is assigned. In this case, a "spontaneous deceleration vehicle" switching function has the highest priority for the "SPORT" switching mode.

The "spontaneous deceleration vehicle" switching function has an activated Condition such a shift of downshift characteristics that a braking effect the engine of the vehicle when the vehicle brakes sharply due to suitable downshifts in the automatic transmission additionally to disposal stands.

In the adaptive driver type assessment 2 For example, an evaluation is carried out only between so-called S0 to S4 driving programs, each of which effects a specific activation of the automatic transmission depending on the sportiness of the driving style of a driver. However, if a certain basic type of driver is prioritized by specifying a value of the control parameter "GT" that is defined as a function of the activated switching mode, then a fixed driver type and thus also a specific driving program is selected for a combination of selector lever and button activation.

Furthermore, it is provided that at one Change from one of the switching modes to the "WINTER" switching mode, preferably one Slip control is activated, which causes the drive wheels to spin avoids a smooth surface. However, if the "SPORT" switching mode is activated, the Slip prevention deactivated, so that even on smooth surfaces spinning of the wheels is possible.

The modular structure described above of the method according to the invention with different independently executed Switching modes and each for the defined change between two Switching modes provided transition functions, which also have a modular structure, advantageously offers the possibility, to implement further switching modes in a simple way. In this way, for example, a "cruise control" switching mode can be included in the state machines be that with the existing switching modes via additional or existing transition functions connections be formed without having to change the switching modes themselves. Accordingly easy is the inventive method also for different types of transmission (automatic transmission, CVT, automated Manual transmission, dual clutch transmission) applicable, if necessary considering of gear type-specific conditions for the State machine.

With the method according to the invention is clearly defined when changing between two switching modes, which switching mode is exited and which switching mode is activated becomes. This is guaranteed by the predefined transition functions, because through the transition functions this important information transmitted become. Furthermore, the transition functions are very different Requirements for controlling a transmission can be realized.

These requirements can be met, for example, via the Many of the sensors already present in a vehicle, such as for example a sensor of an ABS system, an acceleration sensor for detection of cornering or an inclination sensor, generated and then via the Method according to the invention in the control of the transmission input Find.

1

state machine

2

Driver type evaluation

"INIT"

switching mode initialization

"PRN"

switching mode for parking, reverse gear and neutral

position the selector lever

"NORMAL"

switching mode for selector lever position "D"

"TIP"

switching mode Jog

"SPORTS"

switching mode

"BG"

switching mode limit

"WINTER"

switching mode

"FROM"

control parameters the driver type assessment, adaptations

Area

"GT"

control parameters the driver type evaluation, basic type

S0 to S4

driving program the driver type rating

Claims (11)

Method for controlling a gearbox Motor vehicle powertrain, which is different depending selectable according to a driver request Switching modes ("INIT", "PRN", "NORMAL", "TIPP", "SPORT", "BG", "WINTER") includes the to post a translation each have at least one shift program in the automatic transmission, the switching modes ("INIT" to "WINTER") differentiated from each other Represent control modules and a change from one switching mode ("INIT" to "WINTER") to another Switching mode ("INIT" to "WINTER") using at least a predefined transition function is carried out adapted to a current operating state of the drive train. A method according to claim 1, characterized in that the transition function an independent Control module represents. A method according to claim 2, characterized in that the transition function when changing from one switching mode ("INIT" to "WINTER") to another Switching mode ("INIT" to "WINTER") control parameters ("AB", "GT") of the old switching mode ("INIT" to "WINTER") to the new switching mode ("INIT" to "WINTER") passes. A method according to claim 3, characterized in that the Control parameters ("AB", "GT") of the old switching mode via the transition function dynamic in control parameters ("AB", "GT") of the new switching mode variable are. Method according to one of claims 2 to 4, characterized in that the transition function when changing from one switching mode ("INIT" to "WINTER") to another switching mode ("INIT" to "WINTER") control parameters ("AB", "GT") depending on the current operating state of the drive train for the new switching mode ( "INIT" to "WINTER"). Method according to one of claims 1 to 5, characterized in that the transition function is a driver type evaluation ( 2 ) through which a driver's driving behavior or a driver's request is taken into account. Method according to claim 6, characterized in that in the driver type evaluation ( 2 ) the driver's request can be prioritized over the consideration of the driver's driving behavior. A method according to claim 6 or 7, characterized in that that at the commissioning of a vehicle the evaluation of driving behavior of a driver is set to zero and a specification of a basic driver type is assigned a predefined value. Method according to one of claims 1 to 5, characterized in that that the transition function Special driving program represents about which a driving strategy, preferably switch-back points, can be influenced. Method according to one of claims 1 to 9, characterized in that that in each switching mode ("INIT" to "WINTER") depending an operating state-dependent translation request a prioritization between different for the respective switching mode ("INIT" to "WINTER") characteristic Circuit programs for setting a translation in the automatic transmission is carried out. Method according to one of claims 1 to 10, characterized in that that this Transmission an automatic transmission or a CVT or an automated one Manual transmission or an automated dual clutch transmission is.