WO2009077318A2

WO2009077318A2 - Motor vehicle control system

Info

Publication number: WO2009077318A2
Application number: PCT/EP2008/066596
Authority: WO
Inventors: Winfried Fakler; Stefan Wallner; Johannes Kaltenbach
Original assignee: Zf Friedrichshafen Ag
Priority date: 2007-12-17
Filing date: 2008-12-02
Publication date: 2009-06-25
Also published as: DE102007055821A1; WO2009077318A3

Abstract

The invention relates to a motor vehicle control system for controlling a motor vehicle with a hybrid drive system comprising an internal combustion engine and an electric motor, wherein the motor vehicle control system comprises a plurality of functional components subdivided into at least three subcomponents, which is to say a strategy subcomponent (8), a control subcomponent (9) and an actuator subcomponent (10), said functional components including at least one internal combustion engine functional component (2) for controlling the internal combustion engine, a transmission functional component (3) for controlling a transmission, and a hybrid functional component (4) for controlling the electric motor, and with a clutch connected between the internal combustion engine and the electric motor, wherein at least the strategy subcomponent (8) of the hybrid functional component (4) comprises a torque specification module that transmits at least one desired value for a torque distribution between the internal combustion engine and the electric motor of the hybrid drive to the control subcomponent (9) of the hybrid function component (4), wherein the control subcomponent (9) of the hybrid function component produces a corresponding target value from the desired value or any desired value provided for the torque distribution between the internal combustion engine and the electric motor.

Description

Kraftfahrzeuqsteuerunqssvstem

The invention relates to a motor vehicle control system for controlling a motor vehicle with a hybrid drive comprising an internal combustion engine and an electric motor.

A motor vehicle control system has several functional components, such. B. via an internal combustion engine functional component, a transmission functional component, a brake functional component and a battery functional component, wherein the individual functional components in conjunction with each other ensure the proper operation of a motor vehicle. A motor vehicle control system for controlling a motor vehicle with a hybrid drive additionally requires a hybrid functional component.

In motor vehicle control systems known from practice, the individual functional components exchange information or data via data buses, the interaction of the individual functional components being coordinated via a central coordination device. This results in a hierarchical, tree-like structure for a motor vehicle control system, wherein such a hierarchical, tree-like structure requires a powerful central coordination device, via which the entire communication between the individual functional components is handled.

Proceeding from this, the present invention is based on the problem of providing a novel motor vehicle control system for controlling a motor vehicle with a hybrid drive comprising an internal combustion engine and an electric motor. This problem is solved by a motor vehicle control system according to claim 1.

The motor vehicle control system according to the invention has a plurality of functional components subdivided into at least three subcomponents, namely a strategy subcomponent, a control subcomponent and a subordinate subcomponent, namely at least one internal combustion engine functional component for controlling the internal combustion engine, a transmission functional component for control a transmission and a hybrid functional component for controlling the electric motor and a clutch connected between the internal combustion engine and the electric motor, wherein at least the strategy subcomponent of the hybrid functional component comprises a torque setting module, which has at least one setpoint for a torque distribution between the internal combustion engine and the electric motor of the Hybrid drive to the control sub-component of the hybrid functional component transmitted, wherein the control sub-component of the hybrid functional component of the or each provided setpoint f r, the torque distribution between the internal combustion engine and the electric motor erzeugtt a corresponding target value.

The motor vehicle control system according to the invention is distinguished by a defined functional structuring by splitting up functionalities or tasks into the functional components or the subcomponents of the functional components. In particular, the invention proposes a defined functional structure for the control subcomponent of the hybrid functional component in order to determine target values from target values predetermined by strategy subcomponents of the functional components, wherein control variables for the actuator subcomponents of the functional components are determined on the basis of the target value. The defined function structuring of the motor vehicle control system according to the invention supports a clear separation between functionalities or tasks and thus a distributed, independent development of functional components or subcomponents of the functional components. Individual functional components or subcomponents can be easily exchanged.

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 shows a schematic block diagram of a motor vehicle control system according to the invention for controlling a motor vehicle with a hybrid drive comprising an internal combustion engine and an electric motor;

Fig. 2 is a block diagram of a detail of the vehicle control system of Fig. 1 according to the invention; and

3 is a block diagram of a detail of the detail of FIG. 2.

1 shows a schematic block diagram of a motor vehicle control system 1 according to the invention for controlling a motor vehicle with a hybrid drive comprising an internal combustion engine and an electric motor.

The motor vehicle control system 1 comprises a plurality of functional components 2, 3, 4, 5, 6 and 7 subdivided into three subcomponents, each of these functional components 2 to 7 being subdivided into a strategy subcomponent 8, a control subcomponent 9 and an actuator subcomponent 10. These functional components subdivided into at least three subcomponents are in the embodiment of FIG. 1 an internal combustion engine functional component 2 for controlling the internal combustion engine, a transmission functional component 3 for controlling a transmission, a hybrid functional component 4 for controlling the electric motor and a clutch connected between the engine and the electric motor, a battery functional component 5 for controlling a battery, a brake functional component 6 for controlling a brake, and a retarder functional component 7 for controlling a retarder.

All functional components 2 to 7 are subdivided into three subcomponents 8, 9 and 10, wherein the actuator subcomponent 10 of the hybrid functional component 4 is subdivided in the exemplary embodiment shown into two subsubcomponents, namely a subsubcomponent 1 1 for the electric motor and a subsubcomponent 12 for the switched between the electric motor and the engine of the hybrid drive clutch.

The subcomponents 8 to 10 of the functional components 2 to 7 are assigned defined tasks or functionalities.

Thus, the strategy subcomponent 8 of each functional component 2 to 7 serves at least the determination of at least one setpoint value for the respective functional component 2 to 7, namely for the control subcomponent 9 of the respective functional component 2 to 7. Furthermore, the strategy subcomponent 8 of each functional component 2 7 serve to determine data for influencing the strategy subcomponent 8 of at least one other functional component 2 to 7 and the control subcomponent 9 of at least one other functional component 2 to 7. The control subcomponent 9 of each functional component 2 to 7 serves to check the or each target value provided by the strategy subcomponent 8 of the respective functional component 2 to 7 and thus to determine at least one target value for the respective functional component. From the or each target value, the control subcomponent 9 determines manipulated variables for the actuator subcomponent 10 of the respective functional component 2 to 7. Furthermore, the control subcomponent 9 of each functional component 2 to 7 serves to determine data for influencing the strategy subcomponent 8 and / or the control subcomponent 9 of at least one other functional component. Furthermore, the control subcomponent 9 preferably serves the feedback of at least one actual value to the strategy subcomponent 8 of the respective functional component.

The actuator subcomponent 10 of each functional component 2 to 7 at least serves to implement the or each target value on the basis of the manipulated variables determined from the or each target value and the feedback of at least one actual value to the control subcomponent 9 of the respective functional component 2 to 7.

In addition to the functional components 2 to 7 subdivided into three subcomponents, the motor vehicle control system 1 of FIG. 1 comprises a plurality of functional components 13, 14, 15 and 16, which form an environment of the functional components 2 to 7. The function components 13, 14, 15 and 16 forming the environment of the functional elements 2 to 7 are in FIG. 1 a driver request recognition function component 13 which derives a desired moment and / or a desire for sportiness on the basis of an accelerator pedal actuation and / or brake pedal actuation, about a Fahrsituation- serkennungs functional component 14, which derives a cornering and / or gradient travel based on lateral acceleration sensors and inclination sensors of the motor vehicle, a control panel function unit 15, the selector lever and controls a transmission and / or retarder queries. Furthermore, an assistance system function component 16 is present, which provides a torque specification and / or speed specification.

The or each setpoint provided by the strategy subcomponent 8 of the hybrid function component 4 is an abstract setpoint that is independent of a specific configuration of a drive train of a motor vehicle. Only in the control subcomponent 9 of the hybrid function component 4 is the or each abstract setpoint specified and linked to the concrete drive train configuration. This will be described with reference to FIG.

FIG. 2 shows details of the control subcomponent 9 of the hybrid functional component 4, which relate to the stepwise specification of the or each target value 17 provided by the strategy subcomponent 8. In a first module 18 of the control subcomponent 9 of the hybrid function component 4, at least one corresponding target value 19 is generated from the or each provided target value 17, the generation of the or each target value 19 from the respective target value 17 and further preferably from a corresponding actual value 20 is dependent.

The actual value 20 is provided by the module 23 according to FIG. 2, but the same can also be provided by the module 25.

According to FIG. 2, the first module 18 transmits the respective actual values 21 to the strategy subcomponent 8 of the hybrid function component 4.

The or each target value provided by the first module 18 is used in a second module 23 to generate a target value for a powertrain condition. The target powertrain condition, which preferably includes a sequence of powertrain conditions, is used in the second module 23 to select at least one operational function module 24 that includes control-side operations for implementing the powertrain condition target.

The second module 23 selects a sequence of operational functional modules 24 to ultimately implement the target powertrain condition.

The operational function modules 24 can in particular be a function module for a direct start of the internal combustion engine, a function module for coupling the internal combustion engine to the electric motor, a function module for decoupling the internal combustion engine from the electric motor, a functional module for pure electromotive driving and act a functional module for a hybrid ride. The operational functional modules mentioned here are only examples. Of course, other or additional operational functional modules 24 may be present.

On the basis of the selected operational function modules 24 and the control-end processes thereof, a sequence of manipulated variables for the actuator subcomponent of the hybrid functional component 4 is provided in a module 25 of the control subcomponent of the hybrid functional component 4, namely manipulated variables 26 for the subsubcomponent Actual values 28 and 29 of the subsubcomponents 1 1, 12 are provided by the same to the control subcomponent 9 of the hybrid functional component 4. The present invention now relates to such details of the control subcomponent 9 of the hybrid functional component 4, which relate to the determination of the or each target value from the or each target value provided by the strategy subcomponent of at least one functional component. This will be described in detail below by way of example with reference to FIG.

3, it can be seen that the strategy subcomponent 8 of the hybrid functional component 4 comprises a plurality of modules, namely in particular a torque command module 30, a control state specification module 31 and a driving state specification module 32. The torque command module 30 sets a target value 17a for a torque distribution between the engine and the hybrid drive electric motor is ready and transmits this set value 17a to the first module 18 of the control subcomponent 9. The operating state setting module 31 determines a hybrid drive mode command value 17b, and the drive state setting module 32 determines a drive state set value 17c, the set values 17b and 17c as well as the desired value 17a are provided to the first module 18 of the control subcomponent 9.

3, the torque distribution command value 17a between the engine and the hybrid drive motor provided by the torque command module 30 of the strategy subcomponent 8 of the hybrid function component 4 becomes a first submodule 33 of the first module 18 of the control subcomponent 9 of the hybrid function component 4, wherein according to FIG. 3, this submodule 33 is provided with a further desired value 34 for the torque distribution between the internal combustion engine and the electric motor of the hybrid drive from a torque selection module, not shown, of the strategy subcomponent 8 of the transmission functional component 3. From these desired values 17a and 34 of the strategy subcomponents 8 of the hybrid functional component 4 and the transmission functional component 3, the submodule 33 determines a target value 19a for the torque distribution between the internal combustion engine and the electric motor, this target value 19a being provided to the second module 23. The determination of the target value 19a from the different setpoint values 17a and 34 in the submodule 33 is preferably carried out in that z. B. is selected depending on priorities of the two setpoints 17a and 34 as a target value 19a. Likewise, the setpoint values 17a or 34 can be offset from each other to provide the target value 19a. Priorities can be temporary.

In the exemplary embodiment of FIG. 3, the operating state specification module 31 of the strategy subcomponent 8 of the hybrid functional component 4 provides a setpoint 17b for the operating state of the hybrid drive to the first module 18 of the control subcomponent 9 of the hybrid functional component 4, namely a second submodule the 35th

The second submodule 35 determines a target value 19b for the operating state of the hybrid drive as a function of this desired value 17b and transmits the same to the second module 23 of the control subcomponent 9 of the hybrid functional component 4.

Although not shown, a strategy subcomponent of another functional component of the vehicle control system may include an operating state default module that determines a setpoint for the hybrid drive mode and transmits the setpoint to the second submodule 35 of the control subcomponent 9 of the hybrid function component 4 , in which case the second submodule 35 in turn determines a corresponding target value from different desired values for the operating state of the hybrid drive and makes it available to the second module 23. The driving state specification module 32 of the strategy subcomponent 8 of the hybrid function component 4 provides a target value 17c for a driving state of the motor vehicle and transmits it to the first module 18 of the control subcomponent 9 of the hybrid functional component 4, namely to a third submodule 36 thereof.

According to FIG. 3, a strategy subcomponent of a further, not-shown functional component comprises a further driving state specification module which provides a corresponding desired value 37 for the driving state of the motor vehicle to the third submodule 36 of the first module 18 of the control subcomponent 9 of the hybrid functional component 4, wherein the third submodule 36 then in turn determines a corresponding target value 19c from the different target values 17c and 37 for the driving state of the motor vehicle and provides same to the second module 23 of the control subcomponent 9 of the hybrid functional component 4. The determination of the target value 19c is again preferably carried out by selecting one of the target values 17c, 37 on the basis of priorities.

From the target values 19a, 19b and 19c provided to the second submodule 23, a target value for an override condition of the motor vehicle is determined, wherein the second module 23 selects at least one operational function module 24 based on the target value for the powertrain state, which controls processes for implementing the Target value for the powertrain. The module 25 then provides manipulated variables for the actuator subcomponent 10 of the hybrid functional component 4.

The check of target values for determining target values described for the hybrid functional component can be carried out in each functional component of the motor vehicle control system according to the invention. Thus, the checking of setpoint values for determining target values can also be carried out in the control subcomponents of the transmission functional component 3 as well as the internal combustion engine subcomponent 2 or also the battery subcomponent 5.

It is likewise possible for the above checking and selection of data in the strategy subcomponents 8 and the subordinate subcomponents 10 of the functional components to be used, in which case only other data are preferably checked and evaluated in this way in the sense of a selection.

In contrast to the exemplary embodiment shown, it is possible for at least the strategy subcomponent 8 of the hybrid function component 4 and / or the strategy subcomponent 8 of the transmission functional component 3 to comprise a driving state recognition module instead of the driving state specification module, which does not have a setpoint but an actual value for the Driving condition determined and transmitted the actual value to the control sub-component 9 of the hybrid functional component 4, which generates a corresponding target value from the actual value. With regard to the remaining details, reference may be made to the above statements.

REFERENCE CHARACTERS

1 vehicle control system

2 internal combustion engine functional component

3 gearbox function component

4 hybrid functional component

5 battery functional component

6 brake function component

7 Retarder functional component

8 Strategy subcomponent

9 control subcomponent

10 position subcomponent

11 sub-component

12 partial subcomponent

13 driver request recognition function component

14 driving situation recognition function component

15 Control panel functional unit

16 assistance system function component 17, 17a, 17b, 17c setpoint

18 first module

19, 19a, 19b, 19c target value

20, 20a, 20b, 20c actual value

21, 21 a, 21 b, 21 c actual value

22 target value

23 second module

24 operative function module

25 module

26 manipulated variable

27 manipulated variable

28 actual value actual value

Torque input module

Mode setting module

Driving state specification module

submodule

setpoint

submodule

setpoint

Claims

Patent claims

A vehicle control system for controlling a motor vehicle having a hybrid drive comprising an internal combustion engine and an electric motor, having a plurality of at least three subcomponents, namely a strategy subcomponent (8), a control subcomponent (9), and a subordinate subcomponent (10 ), subdivided functional components, namely at least one internal combustion engine functional component (2) for controlling the internal combustion engine, a transmission functional component (3) for controlling a transmission and a hybrid functional component (4) for controlling the electric motor and one between the internal combustion engine and the electric motor switched clutch, wherein at least the strategy subcomponent (8) of the hybrid functional component (4) comprises a torque setting module, which at least one setpoint for a torque distribution between the internal combustion engine and the electric motor of the hybrid drive to the control subcomponent (9) of the hybrid Funktionskompon 4), wherein the control subcomponent (9) of the hybrid functional component generates a corresponding target value from the or each provided torque distribution set point between the internal combustion engine and the electric motor.

2. Motor vehicle control system according to claim 1, characterized - characterized in that the strategy subcomponents (8) of the hybrid function component (4) and the transmission function component (3) each comprise a torque setting module, each having at least one desired value for a torque distribution between the The combustion engine and the electric motor of the hybrid drive to the control sub-component (9) of the hybrid functional component (4), wherein the control sub-component (9) of the hybrid functional component of the provided by the torque setting modules setpoints for the torque distribution between the internal combustion engine and Electric motor generates a corresponding target value.

3. Motor vehicle control system according to claim 1 or 2, characterized in that the control subcomponent (9) of the hybrid function component (4) in a first submodule (33) of a first module (18) from the different setpoint values for the torque distribution between the internal combustion engine and the electric motor, the corresponding target value determined by the fact that the setpoints are checked and preferably charged with each other.

4. Motor vehicle control system according to one of claims 1 to 3, characterized in that at least the strategy subcomponent (8) of the hybrid functional component (4) comprises a Betriebszustestsvorgabemodul which determines a desired value for the operating state of the hybrid drive and the setpoint to the Control sub-component (9) of the hybrid function component (4), wherein the control sub-component (9) of the hybrid function component generates a corresponding target value from the setpoint provided by the operating state specification module.

5. Motor vehicle control system according to claim 4, characterized in - that the strategy subcomponent (8) of the hybrid functional component (4) and the strategy subcomponent (8) of a further functional component, in particular the transmission functional component (3), respectively Operating state specification module, determine the setpoints for the operating state of the hybrid drive and the setpoints to the control subcomponent (9) of the hybrid functional component (4), wherein the control subcomponent (9) of the hybrid functional component (4) in a second sub-module (35) of the first module (18) from the different setpoints for the operating state of the hybrid drive, the corresponding target value determined by the fact that the setpoints are checked and preferably offset against each other.

6. Motor vehicle control system according to one of claims 1 to 5, characterized in that at least the strategy subcomponent (8) of the hybrid function component (4) or the strategy subcomponent (8) of the transmission function component (3) comprises a Fahrzustandsvorgabemodul which determines a set value for the driving condition and transmits the set value to the control subcomponent (9) of the hybrid function component (4), wherein the control subcomponent (9) of the hybrid function component derives from the set value provided by the driving condition setting module corresponding target value generated.

7. Motor vehicle control system according to claim 6, characterized in - that the strategy subcomponent (8) of the hybrid function component (4) and / or the strategy subcomponent (8) of the transmission function component (3) and / or the strategy Subcomponent (8) of another functional component each comprise a driving state specification module that determines setpoint driving conditions and transmits the setpoint values to the control subcomponent (9) of the hybrid function component (4), the control subcomponent of the hybrid function component (4) in a third submodule (36) of the first module (18) from the different setpoint values for the driving state of the hybrid drive the corresponding target value determined by the fact that the setpoints are checked and preferably offset against each other.

8. Motor vehicle control system according to one of claims 1 to 5, characterized in that at least the strategy subcomponent (8) of the hybrid function component (4) or the transmission function component (3) comprises a driving condition detection module which determines an actual value for the driving condition and transmits the actual value to the control subcomponent (9) of the hybrid function component (4), which generates a corresponding target value from the actual value.

9. Motor vehicle control system according to claim 8, characterized in that the strategy subcomponent (8) of the hybrid functional component (4) and / or the transmission functional component (3) and / or a further functional component each comprise a driving state recognition module, determine the actual values for the driving state and transmit the actual values to the control subcomponent (9) of the hybrid function component (4), which determines the corresponding target value from the different actual values for the driving state of the hybrid drive by checking the actual values and preferably calculating against each other become.

Vehicle control system according to one of claims 1 to 9, characterized in that the control subcomponent (9) of the hybrid function component has a second module (23) which, based on the or each target value provided by the first module (18), at least selects an operational function module (24) which includes control-side processes for implementing the target value.

11. The vehicle control system of claim 10, wherein the second module generates a target value for the powertrain state based on the or each target value provided by the first module based on the target powertrain state value selects at least one operational function module (24), which includes control-side processes for implementing the target value for the drive train state.