DE102011087771A1 - Control device i.e. transmission control device, for controlling automatic manual transmission of motor car, has block, where device determines target rotational speed of shift based on ratio of driving resistance and force in target gear - Google Patents

Abstract

The device has a block (7) determining an offset value (12) as an output variable based on input variables (11). The device determines a target rotational speed (13) for a drive assembly of a motor car based on an actual gear and/or a target gear of a shift i.e. traction upshift, to be performed from the actual gear into the target gear in a transmission of the motor car during inclination driving. The device determines a target rotational speed of the shift to be performed based on a ratio of a driving resistance and a traction force in the target gear. An independent claim is also included for a method for determining a target rotational speed for a drive assembly of a motor car for a shift to be performed from the actual gear into the target gear in a transmission of a motor car.

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 invention further relates to a method for determining a target speed for a drive unit of a motor vehicle for a in a transmission of the motor vehicle from an actual gear to a destination -Gang to be executed circuit according to the preamble of claim 7.

From practice motor vehicles with automatic or automated manual transmissions are known in which the execution of a gear change or a circuit in the transmission is controlled or regulated by an actual gear in a target gear via a transmission control device. In known from practice transmission control devices, a target speed for a drive unit for a circuit to be executed depends on the actual gear of the circuit to be executed, depending on the target gear of the circuit to be executed, depending on the driver's request, depending on the driving resistance and depending on the mass of the motor vehicle via determined the transmission control device stored maps or curves, which then results from the target speed, the switching speed at which the circuit to be executed is triggered. The above determination of the target speed for the drive unit for a circuit to be executed via maps or characteristics is carried out in practice both for driving situations in which the motor vehicle is operated in a plane, as well as for driving situations in which the motor vehicle is operated in a slope. In particular, when the motor vehicle is operated on a slope, however, the target speed for the drive unit for the respective circuit to be executed also depends on the available power of the drive unit. So far, however, different drive unit types and thus different performance of drive units can not be fully considered. Rather, for each drive unit type or for each available power of a drive unit, this would require individual parameterization of the transmission control unit via correspondingly adapted characteristic diagrams or characteristic curves. This would require a high application cost.

There is therefore a need for a method and a control device by means of which a target speed for the drive unit can be determined reliably and reliably with little application effort for a circuit to be executed.

Proceeding from this, the object of the present invention is to provide a novel control device of a motor vehicle and a method for determining a target rotational speed for a drive unit of a motor vehicle for a circuit to be executed in a transmission of the motor vehicle from an actual gear to a target gear.

This object is achieved by a control device according to claim 1. According to the invention, the control means further determines the target rotational speed of the circuit to be executed depending on a ratio of a running resistance and a pulling force in the target gear. Due to the fact that the target speed of the circuit to be executed is determined depending on the ratio of the driving resistance and the tensile force in the target gear, different types of drive units and different powertrain configuration can be easily and reliably taken into account without increased application costs in determining the target speed. In this way, a target speed can be safely and reliably determined for a pull upshift to be executed in a gradient ascent without danger of the drive unit being strangled when the upshift is executed.

According to an advantageous refinement, the control device first determines a base target rotational speed as a function of a mass of the motor vehicle and depending on the driving resistance and depending on an accelerator pedal actuation and depending on the actual gear and / or target gear of the circuit to be executed, wherein the control device further depends on the Driving resistance and depending on a dynamic behavior of the drive assembly and dependent on translations of the motor vehicle and depending on the actual gear and / or target gear of the circuit to be executed determines an offset value, and wherein the control means the base target speed and the offset value to determine the target speed to be executed Circuit charged together. This determination of the target speed depending on the base speed and the offset value for correcting the base target speed is particularly easy to implement.

Preferably, the controller determines the offset value depending on the ratio of the running resistance and the traction force in the target gear, wherein the control means the traction in the target gear depending on the dynamic behavior of the drive unit and depending on the translations of the motor vehicle and depending on the target Gear and depending on a dynamic tire radius determined. The above determination of the offset value is particularly preferred because of different types of powertrain and powertrain configurations in determining the target speed for one in a grade to be executed pull upshift can be considered easily and reliably.

The inventive method for determining a target speed for a drive unit of a motor vehicle for a in a transmission of the motor vehicle from an actual gear to a target gear to be executed circuit is defined in claim 7.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

1 a diagram of a drive train with a control device according to the invention;

2 a block diagram for illustrating the operation of the control device according to the invention.

The present invention relates to a control device of a motor vehicle, in particular a transmission control device, and a method for determining a target speed for a drive unit of a motor vehicle for a circuit to be executed in a transmission from an actual gear to a target gear.

1 shows very schematically a drive train scheme of a motor vehicle with a drive unit 1 , being between the drive unit 1 and a downforce 2 a gearbox 3 is switched, which is designed as an automatic or automated manual transmission.

The drive unit 1 is a motor control device 4 assigned, which controls the operation of the drive unit and / or regulates. For this purpose, the engine control unit exchanges 4 with the drive unit 1 Data from. The transmission 3 is a transmission control device 5 assigned to the operation of the transmission 3 controls and / or regulates. For this purpose, the transmission control unit exchanges 5 with the gearbox 3 Data from. 1 shows that the engine control device 4 and the transmission control device 5 exchange data with each other.

The present invention relates now to such details, by means of which the control device, namely the transmission control device 5 , for one in the transmission 3 of the vehicle from an actual gear to a target gear to be executed circuit a target speed for the drive unit 1 determined, namely for a to be executed in a gradient ride of the motor vehicle upshift.

The control device, namely the transmission control device 5 , determines the target speed for the drive unit 1 at least depending on the actual gear of the circuit to be executed and depending on the target gear of the circuit to be executed as well as a ratio of a driving resistance and a tensile force in the target gear, wherein the driving resistance depends at least on the slope in which the motor vehicle is operated or in which the circuit or the gear change is to be executed. In addition to the slope of the driving resistance may also be dependent on the air resistance and rolling resistance of the motor vehicle.

A preferred variant for determining the target speed for the drive unit 1 Depending on the target gear, the actual gear and the ratio of the driving resistance and the traction in the target gear will be described below with reference to the block diagram of 2 described in detail.

So shows 2 a block 6 , which input variables nine be provided, wherein the block 6 based on the input variables nine as output a base target speed 10 certainly. With the input variables nine on the basis of which the block 6 the base target speed 10 determined, it is preferably the mass of the motor vehicle, the driving resistance, a driver's request and the actual gear and / or target gear of the circuit to be executed.

The driver's request may be from the transmission control device 5 be determined depending on a driver-side accelerator pedal operation.

Furthermore, in 2 shown in a block 7 depending on input variables 11 as output variable an offset value 12 is determined. With the input variables 11 , based on which the block 7 the offset value 12 determines, it is the ratio of the driving resistance and the pulling force in the target gear and the actual gear and / or target gear of the circuit to be executed. As already stated, the driving resistance is dependent at least on the gradient in which the circuit is to be executed, if necessary in addition to the air resistance and rolling resistance. The traction force in the target gear is a traction reserve in the target gear, which depends on a dynamic behavior of the drive unit 1 and is determined depending on translations of the motor vehicle and depending on the target gear and preferably depending on a dynamic tire radius. In the translations of the motor vehicle, which are taken into account in the determination of the traction in the target gear or the determination of the traction reserve in the target gear, it is the translation of the transmission 3 in the target gear as well as axle translations.

In a block 8th become the base target speed 10 and the offset value 12 for determining the target speed 13 offset against each other, in particular by an additive superposition of the same.

In the above manner, the target rotational speed for the prime mover can be particularly simple, safe and reliable for a traction upshift to be performed in a gradient drive 1 be determined, namely, depending on the ratio of the driving resistance and the tensile force or tensile load reserve in the target gear. This makes it possible to easily consider different drive unit types and drive train configurations in determining the target speed, without an increased application effort is required.

In the control device 5 are preferably for determining the base speed 10 and the offset value 12 So in the blocks 6 and 7 , Characteristics or characteristic maps deposited.

On the basis of the characteristic curves or characteristic diagrams, each depends on the respective input variables nine and 11 the respective output variable, ie the base target speed 10 and the offset value 12 , certainly. Such a map-dependent or characteristic-dependent determination of the target speed is particularly simple.

Then, when multiple gear jumps are to be performed at a gear change, the above determination of the target rotational speed is made in a loop because the target rotational speed must be made depending on the respective target gear.

It is a realization of the present invention that a target speed for a train upshift to be executed in a gradient drive can be determined particularly advantageously on the basis of the ratio of the travel resistance and the tractive force or tractive force reserve in the target gear. All the translations of the powertrain and the performance or dynamic behavior of the drive unit are included 1 considered, so that the invention can be used without increasing the application effort in different powertrains with different powertrain configurations and different drive units.

Typically, when the ratio of driving resistance and tractive effort in the target gear is relatively small, no or only a relatively small offset value is used. Then, on the other hand, when the ratio of the running resistance and the traction reserve in the target gear is relatively large, a relatively large offset value becomes 12 used.

Over a relatively large offset value, either a speed drop during load build-up can be corrected in the upshift operation to be performed or, alternatively, an upshift into the respective target gear can be suppressed, depending on how large the ratio of drive resistance and tractive effort is in the target gear. The larger this ratio is, the larger the offset value is to suppress an upshift into the respective target gear.

LIST OF REFERENCE NUMBERS

1

power unit

2

output

3

transmission

4

Motor controller

5

Transmission control device

6

block

7

block

8th

block

9

input

10

Base target speed

11

input

12

offset value

13

Target speed

Claims (8)

Control device of a motor vehicle, in particular transmission control device ( 5 ), which are for one in a transmission ( 3 ) of the motor vehicle from an actual gear to a target gear to be executed circuit a target speed for a drive unit ( 1 ) of the motor vehicle depending on the actual gear of the circuit to be executed and / or determined depending on the target gear of the circuit to be executed, namely for an uphill to be executed in a gradient upshift, characterized in that the control device, the target speed of the circuit to be executed further depending on a Ratio determined from a driving resistance and a pulling force in the target gear. Control device according to claim 1, characterized in that the first depending on a mass of the motor vehicle and depending on the driving resistance and depending on a driver's request and depending on the actual gear and / or target gear of the circuit to be executed determines a base target speed that the control device Furthermore, depending on the driving resistance and dependent on a dynamic behavior of the drive unit and dependent on translations of the motor vehicle and depending on the actual gear and / or target gear of circuit to be executed determines an offset value, and in that the control means calculates the base target rotational speed and the offset value for determining the target rotational speed of the circuit to be executed. Control device according to claim 2, characterized in that it determines the base target speed depending on the driving resistance and thus depending on a slope in which the motor vehicle is operated. Control device according to claim 2 or 3, characterized in that it determines the offset value depending on the ratio of the driving resistance and the traction in the target gear, wherein the control means the traction in the target gear depending on the dynamic behavior of the drive unit and depending on the Translations of the motor vehicle and depending on the target gear and preferably determined depending on a dynamic tire radius. Control device according to one of claims 1 to 4, characterized in that the same determines the target speed map-dependent. Control device according to one of claims 2 to 5, characterized in that in the same for the determination of the base target speed as well as for the determination of the offset value in each case at least one map is stored. Method for determining a target speed for a drive unit of a motor vehicle for a circuit to be executed in a transmission of the motor vehicle from an actual gear to a target gear, namely for a train upshift to be executed in a gradient drive, wherein the target rotational speed depends on the actual gear to be executed Circuit and / or is determined depending on the target gear of the circuit to be executed, characterized in that the target speed of the circuit to be executed further determined depending on a ratio of a driving resistance and a tensile force in the target gear. Method according to claim 7, characterized by features according to one of claims 2 to 6.

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