DE102011078270B4 - Method and device for operating a motor vehicle - Google Patents

Abstract

Method for operating a motor vehicle with a plurality of actuators, in which an operating strategy (BS) of the motor vehicle is determined from a predetermined set of operating strategies (BS) depending on at least one operating variable (B) of the motor vehicle, the respective operating strategy (BS ) an indicator value is assigned, which characterizes the operating strategy (BS) and by means of the operating strategy the type of provision of the required energy is specified and/or consumers are each specified a maximum entitled energy share of the energy provided, - depending on the determined operating strategy (BS) and at least one of the operating variables (B) of the motor vehicle, respective manipulated variables (S) of the actuators are determined and during a control phase, during which the respective actuators are controlled in terms of implementing the operating strategy (BS), the indicator value characterizing the respective operating strategy (BS). is recorded as an indicator (IND) and stored in association with geographic data that are determined as a function of a current position of the motor vehicle.

Description

The invention relates to a method and a device for operating a motor vehicle with a plurality of actuators.

Due to low CO2 emissions, interest in battery-powered vehicles, especially vehicles with hybrid drives, is increasing rapidly. Vehicles with a hybrid drive structure have an internal combustion engine and preferably at least one electric machine as the drive unit. In this way, the drive torque can be applied by both drive units while the hybrid vehicle is being driven. For this purpose, an energy management system in the vehicle evaluates data from an engine and chassis controller as well as from sensors in the driving assistant systems. Depending on the requirements, the electrical machine and/or the combustion engine can be controlled in a consumption-optimized, performance-optimized or pollutant-optimized manner. Even in vehicles that only have an internal combustion engine as the drive unit, the importance of the energy management system in the motor vehicle is increasing due to an increasing number of electrical consumers and an associated increase in power consumption.

DE 10 2009 007 950 A1 discloses a device for detecting and providing information about driving situations along a route with a sensor device for detecting driving state variables along the route; a device for detecting the position of the vehicle along the route; a memory device for storing the detected driving state variables and/or data derived therefrom as well as the respectively detected position of the vehicle. The device is characterized in that a device is provided for determining driving situation information for the route on the basis of the detected driving state variables, each driving situation information determined together with the corresponding detected position of the vehicle in the memory device to form a trip log for the Route is stored, and that a device for outputting the driving situation information of the trip log from the memory device is provided.

DE 10 2009 028 922 A1 discloses a method for operating a hybrid vehicle, which is driven either with an internal combustion engine and with an electric motor, the electric motor being supplied with electrical energy from an energy storage device, the control of the proportion of the drive by the internal combustion engine and the drive by the electric motor being carried out by a Hybrid control is carried out taking into account at least the state of charge of the energy storage device and determined position data of the hybrid vehicle, and the kinetic energy of the hybrid vehicle is converted into electrical energy and fed to the energy storage device.

DE 10 2008 010 558 A1 discloses a method for operating a hybrid drive device of a motor vehicle, which has at least two different drive units, in particular an internal combustion engine and an electric machine, with an operating strategy being set for the drive units depending on a route, with the route being driven and at least one driving profile being determined and stored and depending on the driving profile, the operating strategy is influenced when the route is driven on again.

The object on which the invention is based is to create a method and a device for operating a motor vehicle, which makes a contribution to improving energy distribution in the motor vehicle.

The object is solved by the features of the independent patent claims. Advantageous developments of the invention are characterized in the dependent claims.

The invention is characterized by a method and a corresponding device for operating a motor vehicle. The motor vehicle has a plurality of actuators. In each case, an operating strategy of the motor vehicle is determined from a predefined set of operating strategies depending on at least one operating variable of the motor vehicle, with the respective operating strategy being assigned an indicator value which characterizes the operating strategy. Depending on the determined operating strategy and at least one of the operating variables of the motor vehicle, respective manipulated variables of the actuators are determined. During a control phase, during which the respective actuators are controlled in terms of implementing the operating strategy, the indicator value characterizing the respective operating strategy is recorded as an indicator and stored in association with geographic data. The geographic data are determined depending on a current position of the motor vehicle.

The type of provision of the required energy is specified by means of the operating strategy and/or consumers are each specified a maximum entitled energy portion of the energy provided. Operating strategies can be specified for the motor vehicle, the different hierarchical levels of energy distribution in the Motor vehicle can be assigned. The operating strategy can relate to individual components of the motor vehicle, for example a component for energy conversion, for example a generator. Furthermore, the operating strategy can relate to a unit with multiple components of the motor vehicle, for example a low-voltage electrical system of the motor vehicle. The operating strategy can also relate to a subsystem of the motor vehicle that includes a number of units, for example to an overall on-board network of the motor vehicle that includes the low-voltage on-board network and a high-voltage on-board network. A first operating strategy can be, for example, that a hybrid drive device of a hybrid motor vehicle is operated purely electrically. A second operating strategy can be, for example, that the hybrid drive device is operated purely by an internal combustion engine. A third operating strategy can be, for example, that the hybrid drive device is operated in mixed operation. A fourth operating strategy can be, for example, that the motor vehicle is operated in a recuperation mode.

Saving the respective indicator values associated with the geographic data advantageously enables indicator data to be provided that characterize the operating strategy implemented by the motor vehicle. The indicator data provided in this way enable a system behavior of the motor vehicle to be analyzed and/or compared with a predetermined system behavior in a location-dependent manner. The stored data can be used for an optical display, in which the indicator data is displayed, for example, together with a road map and/or together with route data of the motor vehicle. The specified system behavior can be determined, for example, by simulation and/or can be determined as a function of historical system behavior. The provision of the indicator data can thus contribute to simplifying and improving a system diagnosis and/or a control of the operating strategy and/or an adjustment of the operating strategy. This in turn can contribute to reducing development costs and/or increasing the reliability of the motor vehicle. The analysis or comparison can be carried out in a simple manner while the vehicle is in an active operating state and/or independently of an active operating state of the motor vehicle, for example after a test drive using a suitably designed computing unit independent of the motor vehicle. The indicator can be detected and stored both during test drives and during any journeys by a motor vehicle owner with the motor vehicle. The stored data can be used both for developing the motor vehicle and for servicing the motor vehicle. The data can be read out, for example, in a workshop or by means of a remote query using suitably designed devices.

The respective operating strategy is preferably determined as a function of a predefined set of decision rules and/or other rules that describe a defined relationship between predefined input and output variables. The decision rules and/or the further rules can include so-called if-then conditions. The respective operating variable can include a measured variable or a state variable or another variable derived from measured variables and/or state variables. The respective operating variable can characterize an operating state and/or driving state and/or an environmental state of the motor vehicle.

In an advantageous embodiment, at least one of the operating variables is recorded during the control phase and stored in each case assigned to the geographic data. Providing further data can contribute to the fact that the system behavior of the motor vehicle can be easily understood and a dependency and/or a correlation between different variables can be easily recognized. Agreement, correlation and/or target achievement variables can advantageously be determined as a function of the at least one operating variable.

In a further advantageous embodiment, a temporal and/or spatial progression of the indicator is compared with a predetermined temporal or spatial progression of a reference indicator corresponding to the indicator, and a signal is generated as a function of a determined deviation. The respective reference indicator can be determined, for example, by means of a simulation and/or depending on historical values for the indicator.

In a further advantageous embodiment, a temporal and/or spatial progression of at least one operating variable is compared with a predetermined temporal or spatial progression of a reference variable, and a further signal is generated as a function of a deviation determined in each case.

• 1 ein Ablaufdiagramm für ein erstes Programm zum Betreiben eines Kraftfahrzeugs,
• 2 ein Ablaufdiagramm für ein zweites Programm zum Betreiben eines Kraftfahrzeugs,
• 3 ein Ausführungsbeispiel einer Signalisierung von Daten, die während einer Ansteuerphase des Kraftfahrzeugs erfasst werden und
• 4 ein weiteres Ausführungsbeispiel einer Signalisierung von Daten, die während einer Ansteuerphase des Kraftfahrzeugs erfasst werden.

Exemplary embodiments of the invention are explained below with reference to the schematic drawings. Show it:

• 1 a flowchart for a first program for operating a motor vehicle,
• 2 a flowchart for a second program for operating a motor vehicle,
• 3 an embodiment of a signaling of data that are recorded during a control phase of the motor vehicle and
• 4 a further embodiment of a signaling of data that is recorded during a control phase of the motor vehicle.

Elements of the same construction or function are provided with the same reference symbols across the figures.

1 and 2 show flowcharts for a first and second program for operating a motor vehicle. The motor vehicle has a plurality of actuators. The motor vehicle can have, for example, a large number of sensor units which are each designed to detect and/or determine one or more operating variables B of the motor vehicle. For example, the sensor units can each have one or more sensors for measuring data acquisition. Furthermore, the sensor units can be designed to determine state variables or other variables, for example as a function of the respective measured variables. A number of operating strategies BS are specified for operating the motor vehicle. A control device is arranged in the motor vehicle, for example, which is designed to execute the first program and/or the second program for operating the motor vehicle. The control device can also be referred to as a device for operating the motor vehicle.

The first program ( 1 ) is preferably started in a step S10, in which variables are initialized. The program is preferably started close to the start of an active operating state of the motor vehicle.

In a step S30, one of the operating strategies BS of the motor vehicle is determined from the predefined set of operating strategies BS as a function of at least one operating variable B of the motor vehicle.

In a step S40, depending on the determined operating strategy BS and at least one of the operating variables B of the motor vehicle, respective manipulated variables S of the actuators are determined.

In a step S50, during a control phase, during which the respective actuators are controlled to implement the operating strategy BS, an indicator value characterizing the respective operating strategy BS is recorded as an indicator IND and stored in association with geographic data that depends on a current position of the motor vehicle be determined.

The first program can be terminated in a step S60. However, the first program is preferably processed regularly while the motor vehicle is in an active operating state.

2 shows a flowchart for a second program for operating the motor vehicle. The program is preferably started in a step S110 in which variables are initialized. The start of the second program preferably takes place close to the start of the active operating state of the motor vehicle.

In a step S120, for example, a query is made in which a user can specify whether and which data relating to an operating strategy BS implemented by the motor vehicle should be stored and displayed. Furthermore, it can be provided that the user specifies a display signaling of the data.

Steps S130 through S150 of the second routine correspond to steps S30 through S50 of the first routine.

In a step S160, a temporal and/or spatial progression of the indicator IND is compared with a predetermined temporal or spatial progression of a reference indicator IND_R corresponding to the indicator IND, and a signal is generated depending on a determined deviation.

In a step S170, the operating variables B specified by the user are recorded during the control phase and stored in each case assigned to the geographic data.

In a step S180, a temporal and/or spatial progression of the predefined operating variables B is compared with a predetermined temporal or spatial progression of a reference variable B_R and a further signal is generated depending on a deviation determined in each case. Such a comparison can be carried out for any number of operating variables of the motor vehicle.

In a step S190, the first and/or second signal and/or the indicator IND is displayed, for example together with route data of the route covered by the motor vehicle, using a suitable display device that has been specified by the user.

The second program can be terminated in a step S200. However, the second program is preferably processed regularly during the active operating state of the motor vehicle.

3 shows an embodiment of a signaling of data that is recorded during an activation phase of the motor vehicle. 3 shows the course of the indicator depending on the distance travelled. The indicator was recorded, for example, during several journeys, during which the vehicle always traveled the same route.

A superimposition of the location-dependent indicator curves can be used for a so-called envelope curve display. The superimposition of the location-dependent indicator curves can be used, for example, to determine one or more tolerance bands V for a location and/or time occurrence of a change in the operating strategy BS. Depending on the respective tolerance band V, a system reserve and a probability of a malfunction of the motor vehicle can be determined, for example.

By specifying the respective tolerance band V by adapting the operating strategies, the system reserves and thus the probability of a malfunction of the motor vehicle can be specified.

4 shows an embodiment of a signaling of the data that was recorded during one of the control phases of the motor vehicle.

4 shows a signal diagram in which a first change W1 and a second change W2 of the operating strategies BS are shown in relation to the location. The course of a first operating variable B1, which can represent a determined state variable, for example, is displayed in a location-dependent manner in the signal diagram. Furthermore, for example, the course of a second operating variable B2, which can represent a detected manipulated variable S, for example, can be displayed in the diagram as a function of location. Alternatively or additionally, it is also possible for the curves to be displayed in the diagram as a function of time. If a route is traveled several times, the curves of the respective first operating variable B1, B1′, B1″ and the second operating variable B2, B2′, B2″ can be displayed superimposed. The diagram can be displayed, for example, by means of a suitably designed display in the motor vehicle. Alternatively, a screen of a computer system that is suitably designed independently of the motor vehicle can be used and/or the diagram can be printed out using a printer.

A superimposition of the location-dependent curves can be used, for example, to determine a suitable threshold value or several suitable threshold values for a respective operating variable, which the respective operating variable B must not fall below, for example so that the vehicle does not malfunction. Here, for example, a course of the first operating variable B1 and/or the second operating variable B2 between the first change W1 in the operating strategy BS and the second change W2 in the operating strategy BS can be evaluated. For example, the signal curves between a first location O1, at which the first change W1 from a first operating strategy to a second operating strategy took place, to a second location 02, at which the second change W2 from the second operating strategy to a further operating strategy, which can again be the first operating strategy, has taken place.

A positive TH_p and/or negative threshold value TH_n can characterize a minimum value in terms of absolute value, which a predefined operating variable, for example the second operating variable B2 or the first operating variable B1, must not fall below in terms of absolute value.

Depending on the respective threshold value TH_p, TH_n, system reserves and a probability of a malfunction of the motor vehicle can be determined, for example.

By specifying the respective threshold value TH_p, TH_n by adapting the operating strategies, the system reserves and thus the probability of a malfunction of the motor vehicle can be specified.

Reference List

B

company size

B_R

reference size

B1, B1', B1''

first company size

B2, B2', B2''

second company size

B.S

operational strategy

IND

indicator

IND_R

reference indicator

O1

first place

O2

second place

S

manipulated variable

TH_n

negative threshold

TH_p

positive threshold

V

tolerance band

w1

first change of operating strategy

W2

second change of operating strategy

Claims (5)

Method for operating a motor vehicle with a plurality of actuators, in which - in each case one operating strategy (BS) of the motor vehicle is determined from a predetermined set of operating strategies (BS) as a function of at least one operating variable (B) of the motor vehicle, with the respective operating strategy (BS) being assigned an indicator value which characterizes the operating strategy (BS). and by means of the operating strategy, the type of provision of the required energy is specified and/or consumers are each specified a maximum entitled energy share of the energy provided, - Depending on the determined operating strategy (BS) and at least one of the operating variables (B) of the motor vehicle, respective manipulated variables (S) of the actuators are determined and - During a control phase, during which the respective actuators are controlled in the sense of implementing the operating strategy (BS), the indicator value characterizing the respective operating strategy (BS) is recorded as an indicator (IND) and stored associated with geographical data that depends on a current Position of the motor vehicle are determined. procedure after claim 1 , in which at least one of the operating variables (B) is recorded during the control phase and stored in each case assigned to the geographic data. Method according to one of the preceding claims, in which a temporal and/or spatial progression of the indicator (IND) is compared with a predetermined temporal or spatial progression of a reference indicator (IND_R) corresponding to the indicator (IND) and, depending on a deviation determined, a signal is produced. Method according to one of the preceding claims, in which a temporal and/or spatial progression of the at least one operating variable (B) is compared with a predetermined temporal or spatial progression of a reference variable (B_R) and a further signal is generated depending on a deviation determined in each case. Device for operating a motor vehicle, which comprises a plurality of actuators, the device being designed: - to determine an operating strategy (BS) of the motor vehicle from a predetermined set of operating strategies (BS) depending on at least one operating variable (B) of the motor vehicle, with the respective operating strategy (BS) being assigned an indicator value which characterizes the operating strategy (BS). and by means of the operating strategy, the type of provision of the required energy is specified and/or consumers are each specified a maximum entitled energy share of the energy provided, - depending on the determined operating strategy (BS) and at least one of the operating variables (B) of the motor vehicle to determine respective manipulated variables (S) of the actuators and - During a control phase, during which the respective actuators are controlled in terms of implementing the operating strategy (BS), the indicator value that characterizes the respective operating strategy (BS) is recorded as an indicator (IND) and stored as an indicator (IND) associated with geographical data that depends on a current Position of the motor vehicle are determined.

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