Control device of a motor vehicle

Abstract

A control device (5) of a motor vehicle, in particular a transmission control device, which generates control signals for shifting elements of the transmission (3) involved in executing the gear change in order to control or regulate a gear change in a transmission (3) of the motor vehicle. If a gear step of the gear change to be executed in the transmission (3) is greater than two and / or if a sports shift program is activated on the driver side and / or if a driver type recognition device (8) recognizes a sporty driver type and / or if a kickdown operation of an accelerator pedal (6) is present on the driver side and / or a driver actuation of the accelerator pedal (6) with a temporal gradient greater than a defined limit value, the control device (5) generates control signals for the shifting elements of the transmission (3) involved in the gear change to execute the gear change with traction interruption.and that the control device (5) otherwise generates control signals for the shifting elements of the transmission (3) involved in the gear change to carry out the gear change while maintaining the tractive force, characterized in that when the sports shift program is activated on the driver side or when the driver type recognition device (8) recognizes a sporty driver type, and when there is also a kickdown operation of the accelerator pedal (6) by the driver and / or a driver operation of the accelerator pedal (6) with a time gradient greater than a defined limit value, the control device (5) generates control signals for the shifting elements of the transmission (3) involved in the gear change to carry out the gear change with interruption of the tractive force at an output (2) of the motor vehicle.

Description

The invention relates to a control device of a motor vehicle, in particular a transmission control device, according to the preamble of claim 1.The main components of a drive train of a motor vehicle are a drive unit and a transmission, wherein the transmission is connected between the drive unit and an output of the motor vehicle and provides the traction force supply of the drive unit at the output. The operation of the drive unit is controlled or regulated by a first control device, namely an engine control device. The operation of the transmission is controlled by a second control device, namely a transmission control device. For this purpose, the engine control device exchanges data with the drive unit and the transmission control device exchanges data with the transmission. Further, the engine control device and the transmission control device exchange data with each other.Transmission control devices known from practice generate control signals for shift elements of the transmission that participate in the execution of the shift, in order to control or regulate a shift in the transmission of the motor vehicle. The shift elements of the transmission can be form-locking shift elements and / or friction-locking shift elements in the form of clutches and / or brakes and / or claws.Transmission control devices known from practice generate control signals for the shift elements involved in the execution of the shift for controlling or regulating a shift in a transmission in such a way that the shift changes are carried out taking into account topological positive couplings of the drive train while maintaining the tractive force at the output. This causes relatively long switching times.With increasing demands on the shifting dynamics and accordingly with an increasingly desired shortening of gear changes, an interruption of the tractive force at the output must be accepted when a gear change is carried out in the transmission. When a control device, in particular a transmission control device, can control or regulate gear changes while maintaining the tractive force at the output and while interrupting the tractive force at the output, there is thus far no behavior of the drive train that can be perceived by the driver. It is therefore not possible for a driver to understand under what conditions or in what driving situation in a transmission a gear change is carried out with maintenance of the tractive force or with interruption of the tractive force.The further document DE 101 51 206 A1 discloses a further, known control device of a motor vehicle and a method for controlling and / or regulating the execution of a gear change in a transmission of a motor vehicle.Proceeding from this, the object of the present invention is to create a novel control device of a motor vehicle and a method for controlling and / or regulating the execution of a gear change in a transmission of a motor vehicle, which ensure a driver with a comprehensible motor vehicle behavior when executing gear changes.This object is achieved by a control device according to claim 1. According to the invention, when a gear jump of the gear change to be carried out in the transmission is greater than two and / or when a sport shift program is activated on the driver side and / or when a driver type recognition device recognizes a sport driver type and / or when a kickdown actuation of an accelerator pedal on the driver side is present and / or when a actuation of the accelerator pedal on the driver side is present with a temporal gradient greater than a defined limit value, the control device generates control signals for the shift elements of the transmission involved in the gear change for carrying out the gear change with traction force interruption, wherein the control device otherwise generates control signals for the shift elements of the transmission involved in the gear change for carrying out the gear change with maintenance of the traction force.The control device according to the invention makes it possible for the first time to clearly separate gear changes with interruption of the tractive force at the output and gear changes while maintaining the tractive force at the output, in order to thus provide a driver with a constantly comprehensible behavior of the motor vehicle.Furthermore, when the sport shift program is activated on the driver side or when the driver type recognition device recognizes a sport driver type, and when a kickdown actuation of the accelerator pedal on the driver side continues to be present and / or an actuation of the accelerator pedal on the driver side with a temporal gradient greater than a defined limit value is present, the control device generates control signals for the shift elements of the transmission involved in the gear change for carrying out the gear change with a traction force interruption at the output. Preferably, the control device generates the control signals for the shift elements of the transmission involved in the gear change for carrying out the gear change with traction force interruption at the output in this case only if the gear jump of the gear change to be carried out continues to be greater than two. This procedure for controlling and / or regulating gearshifts with traction force interruption at the output is particularly preferred.The method according to the invention for controlling and / or regulating the execution of a gear change in a transmission of a motor vehicle is defined in claim 3.Preferred developments of the invention are evident from the dependent claims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawings, without being restricted thereto. The following shows: FIG. 1 shows a diagram of a drive train with a control device according to the invention; FIG. 2 is a diagram to illustrate the mode of operation of the control device according to the invention.The present invention relates to a control device, in particular a transmission control device, of a motor vehicle and to a method for controlling and / or regulating the execution of a gear change in a transmission of a motor vehicle.FIG. 1 shows a highly schematic view of a drive train of a motor vehicle having a drive unit 1 and a transmission 3 connected between the drive unit 1 and an output drive 2. the transmission 3 converts rotational speeds and torque and provides the traction force available to the drive unit 1 at the output drive 2.An engine control device 4 is assigned to the drive unit 1 in order to control and / or regulate the operation of the drive unit 1. For this purpose, the engine control device 4 exchanges data with the drive unit 1 in the sense of the dashed arrows shown in FIG. 1.The operation of the transmission 3 is controlled and / or regulated by a transmission control device 5 assigned to the transmission 3, wherein, according to FIG. 1, the transmission control device 5 exchanges data on the one hand with the transmission 3 and on the other hand with the engine control device 4 in the sense of the dashed arrows shown.The transmission 3 comprises shift elements not shown in detail, for example frictional shift elements and / or form-locking shift elements, wherein frictional shift elements are typically designed as brakes or clutches and form-locking shift elements are typically designed as claws. In order to control or regulate a gear change in the transmission 3, the transmission control device 5 generates control signals for shift elements of the transmission 3 that participate in the execution of the gear change.The control device 5 according to the invention, which is preferably designed as a transmission control device, then generates control signals for the shift elements of the transmission 3 involved in the gear change for carrying out a gear change with traction force interruption at the output 2, when a gear jump of the gear change to be carried out in the transmission 3 is greater than two and / or when a sport shift program is activated on the driver side and / or when a sport driver type is detected and / or when a kickdown actuation of an accelerator pedal 6 on the driver side is present and / or when an actuation of the accelerator pedal 6 on the driver side is present with a temporal gradient greater than a defined limit value.If at least one of these conditions is fulfilled alone or alternatively in combination with another of these conditions, the transmission control device 5 automatically generates control signals for the shift elements of the transmission 3 involved in the gear change for carrying out the gear change with traction force interruption at the output 2.Activation of a sports shift program on the driver side can take place, for example, via a separate actuating element 7, which is installed, for example, in the cockpit of a motor vehicle.The recognition of a sport driver type is preferably carried out via a driver type recognition device 8, which is in particular a component of the control device 5.According to a preferred embodiment of the control device 5 according to the invention, the same then generates control signals for the shift elements of the transmission 3 involved in the gear change for executing the gear change with traction force interruption at the output 2, when the sport shift program is activated on the driver side or when the driver type recognition device 8 recognizes a sport type of driver, and when a kickdown actuation of the accelerator pedal 6 on the driver side continues to occur and / or when a actuation of the accelerator pedal 6 on the driver side takes place with a temporal gradient that is greater than a defined limit value.A variant of a control device 5 according to the invention is particularly preferred in which in this case a gear change with traction force interruption at the output 2 is controlled or regulated only when the gear jump of the gear change to be carried out is still greater than two, i.e. when more than two gear steps are located between an actual gear and a target gear of the gear change to be carried out or of the gear change to be carried out.Further details of the control device 5 according to the invention or of the method according to the invention are given in FIG. 2, wherein different time curves are shown over time t in FIG. 2. Thus, a temporal curve profile 9 visualizes a gear step request of a gear change to be carried out. At the time t 1, a gear jump by two gear stages is requested in FIG. 2 for a downshift and at the times t 2 and t 3 a gear jump by a further gear stage is requested, for example at the time t 1 a gear change from the gear 9 to the gear 7, at the time t 2 a gear change from the gear 7 to the gear 6 and at the time t 3 a gear change from the gear 6 to the gear 5, so that overall a gear change from the gear 9 to the gear 5 is to be carried out.In FIG. 2, reference numerals 10 a show a plurality of control signals for a total of four shift elements of the transmission 3 involved in the execution of this gear change, the control signals 10 abeing generated by the transmission control device 5 in such a way that they serve for the execution of a gear change with maintenance of the tractive force at the output 2. Thus, between the times t1 and t4, a gear change from the gear 9 to the gear 7 takes place, between the times t4 and t5, a gear change from the gear 7 to the gear 6 takes place, and between the times t5 and t6, a gear change from the gear 6 to the gear 5 takes place, so that the time period required to carry out the gear change from the gear 9 to the gear 5 when carrying out a shift or a gear change with maintenance of the tractive force at the output 2 is determined by the time period between the times t1 and t6. A temporal profile of the drive unit rotational speed which forms in this case is visualized in FIG. 2 by the temporal curve profile 11 a.Then, if the control device according to the invention generates control signals for carrying out a gear change with traction force interruption at the output 2 as described above, depending on the defined criteria described above, the time required for carrying out the gear change can be shortened, wherein FIG. 2 shows control signals for shift elements of the transmission 3 as curve profiles 10 b, which control signals are involved when carrying out the gear change from the gear 9 into the gear 5 with interruption of the traction force at the output 2.FIG. 2 shows that the shift is completed with interruption of the tractive force at the output 2 at the time t 8, so that the time required for the shift execution is significantly reduced compared to the shift with maintenance of the tractive force at the output 2. A speed profile of the drive unit speed which forms here is shown in FIG. 2 by the curve profile 11 b. A traction force interruption at the output 2 is formed between the times t 7 and t 8.Accordingly, it is within the meaning of the present invention that a control device, in particular a transmission control device 5, automatically initiates either a gear change with interruption of the tractive force or while maintaining the tractive force at the output 2, namely by providing corresponding control signals for the shift elements of the transmission 3 involved in carrying out the gear change, depending on defined operating conditions of the drive train, This ensures a clear separation on the control side between triggering or controlling or regulating a gear change with interruption of the tractive force or while maintaining the tractive force at the output 2, wherein the details of the invention are preferably used for gear changes back. Alternatively, it is possible to use the details of the invention also for upshifts.Reference numerals denote reference numerals1 Drive unit 2 Output 3 Transmission 4 Engine control device 5 Transmission control device 6 Accelerator pedal 7 Actuating device 8 Driver type recognition device 9 Curve profile of gear jump request 10 a Curve profile of shift element actuation 10 b Curve profile of shift element actuation 11 a Curve profile of engine speed 11 b Curve profile of engine speed

Claims

Control device (5) of a motor vehicle, in particular a transmission control device, which generates control signals for shift elements of the transmission (3) involved in the execution of the shift, in order to control or regulate a shift in a transmission (3) of the motor vehicle, wherein, if a gear jump of the shift to be executed in the transmission (3) is greater than two and / or if a sport shift program is activated on the driver side and / or if a driver type recognition device (8) recognizes a sport driver type and / or if a driver-side kickdown actuation of an accelerator pedal (6) is present and / or a driver-side actuation of the accelerator pedal (6) is present with a temporal gradient greater than a defined limit value, the control device (5) generates control signals for the shift elements of the transmission (3) involved in the shift, in order to execute the shift with interruption of the tractive force, and that the control device (5) otherwise generates control signals for the shift elements of the transmission (3) involved in the gear change for executing the gear change with maintenance of the tractive force, characterized in that, if the sport shift program is activated on the driver side or if the driver type recognition device (8) recognizes a sport driver type, and if a kickdown actuation of the accelerator pedal (6) on the driver side continues to be present and / or a actuation of the accelerator pedal (6) on the driver side is present with a temporal gradient greater than a defined limit value, the control device (5) generates control signals for the shift elements of the transmission (3) involved in the gear change for executing the gear change with interruption of tractive force on an output (2) of the motor vehicle.Control device according to Claim 1, characterized in that the control device (5) generates control signals for the shift elements of the transmission (3) which participate in the gear change for carrying out the gear change with interruption of the tractive force in this case only if the gear jump of the gear change which is to be carried out continues to be greater than two.Method for controlling and / or regulating the execution of a gear change in a transmission of a motor vehicle, wherein control signals for shift elements of the transmission involved in the execution of the gear change are generated for controlling or regulating the gear change, wherein control signals for the shift elements of the transmission involved in the gear change are generated for the execution of the gear change when a gear jump of the gear change to be executed is greater than two and / or when a sport shift program is activated on the driver side and / or when a kickdown operation of an accelerator pedal on the driver side is detected and / or when a kickdown operation of the accelerator pedal on the driver side is present with a temporal gradient greater than a defined limit value, control signals for the shift elements of the transmission involved in the gear change are generated for the execution of the gear change with interruption of the tractive force, and otherwise control signals for the shift elements of the transmission involved in the gear change for executing the gear change with maintenance of the tractive force are generated, characterized in that if the sport shift program is activated on the driver side or if a sport driver type is detected, and if a kickdown actuation of the accelerator pedal on the driver side continues to be present and / or a operation of the accelerator pedal on the driver side is present with a temporal gradient greater than a defined limit value, control signals for the shift elements of the transmission involved in the gear change for executing the gear change with interruption of tractive force are generated on an output.Method according to Claim 3, characterized in that control signals for the shift elements of the transmission which participate in the gear change for carrying out the gear change with traction force interruption are generated in this case only if the gear step of the gear change which is to be carried out continues to be greater than two.

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