DE10226143B4 - Method for controlling a hybrid drive in a motor vehicle - Google Patents

Abstract

Method for controlling a hybrid drive with a plurality of drive components (2, 3, 4) in a motor vehicle in dependence on information about a current and an expected driving situation, which are detected via in-vehicle and external vehicle information sources in an electronic automotive system, depending on this information and depending on energy, safety, comfort, pollutant emissions, noise and / or driver type-related requirements in the electronic motor vehicle system a driving operation strategy for controlling at least one of the plurality of drive components (2, 3, 4) is determined,
the information includes travel route data of a route which is linked with vehicle-specific data, so that there is an energy profile associated with the route, which is taken into account in the determination of the driving operation strategy,
the drive components (2, 3, 4) comprise an internal combustion engine (2) and an electric machine (3), and
depending on the driving strategy, the driving power of the internal combustion engine (2) and electric machine (3) is coordinated as required, and wherein
the implementation of the driving strategy in switching commands for the combustion engine ...

Description

The The invention relates to a method for controlling a hybrid drive in a motor vehicle according to the preamble of claim 1.

Known are methods which are used in electric vehicles or vehicles Hybrid drive during braking as well as when driving downhill energy recovery (Recuperation) allow.

Farther is known, the operation such as electric drive or internal combustion engine drive depending on the vehicle environment to influence. The information about the vehicle environment can e.g. the immediate surroundings (city traffic or overland travel) and originate from a navigation system.

Out DE 197 43 958 A1 For example, a method for controlling a drive system is known in which in-vehicle and off-vehicle information is used for a drive strategy for drive control proposed to the driver via feedback (eg, active accelerator pedal).

This Procedure is problematic if a small electrical energy storage is used. The smaller the electrical energy storage, the more frequently are loading and unloading operations, ie: the energy reserves must be used more efficiently, and energy management becomes more important. consequently have to as possible in energy management all parameters taken into account be used to switch between the components of a Hybrid propulsion can be optimized so that the energy reserves can be used more intelligently.

In addition, the describes DE 197 43 958 A1 a method and a device for controlling a drive system in a motor vehicle, wherein depending on current and expected driving situations, a driver actively assisting driving setpoint target strategy is determined. This target strategy can then be accepted or rejected by the driver.

The DE 195 36 512 A1 describes a speed change control for automatic transmissions in motor vehicles with an electronic control unit. The gear changes are determined here as a function of operating parameters of the vehicle.

In the DE 100 35 027 A1 a method is described for controlling an operating mode of vehicles with hybrid drive, whereby the vehicle profile profile to be traveled is recorded and used as an additional criterion for the selection of an operating mode. As a result, an operating mode detection for test cycles is realized.

In US-A-5,487,002 describes an energy management system, when sharing data from an existing navigation system preferably energy-efficient routes can be determined.

From the DE 198 07 291 A1 a method for operating a motor vehicle with hybrid drive is known in which by means of a position sensor, the current position of the motor vehicle is determined and compared with stored data of a road map, and is determined by the comparison in which environment the vehicle is located. Depending on the detected environment, a predetermined operating mode is subsequently set on the vehicle.

task It is the object of the present invention to provide a distance-dependent prediction to enable the energy balance so that the electric drive of the hybrid drive of a motor vehicle can be used more efficiently.

These The object is achieved by the method according to claim 1. Preferred embodiments of the invention are the subject of the dependent claims.

at the method according to the invention vehicle-specific data (e.g., weight, drive system, Efficiency chain, electrical energy demand of the electrical system), driving route data, meteorological data, as well as driver-specific data (for example, sparingly, sporty, "nervous gas foot") linked together. The Result of this link is one of the route associated Energy profile, which the vehicle drive as a reference value in the Choice and distribution of the drive, electric and internal combustion engine serves. In other words, the information obtained is a support in the Switching between electric and internal combustion engine drive.

The method according to the invention for controlling a hybrid drive with a plurality of drive components in a motor vehicle in dependence on information about a current and an expected driving situation, which are recorded via in-vehicle and vehicle-external information sources in an electronic motor vehicle system, depending on this information and on energy consumption. , safety, comfort, pollutant emission, noise and / or driver typebezo According to specifications in the electronic motor vehicle system, a driving operation strategy for controlling at least one of the plurality of drive components is determined, characterized in that the information includes travel route data of a driving route, which are linked with vehicle-specific data, so that there is an energy profile associated with the driving route, which results in the determination the driving strategy is taken into account, and depending on the driving operation strategy, at least one of the plurality of drive components of the hybrid drive is automatically activated or deactivated.

Especially can the information as well be linked with meteorological data or with driver-specific data.

One Advantage of the invention is that its implementation is cost-effective, because it is essentially a software solution. Furthermore, the Potential of consumption savings more efficiently and exhausted so that the energy use is optimized, so that the emissions be reduced. This in turn results in an improvement of the Comfort and a reduction of wear.

Further Features and advantages of the invention will become apparent from the following Description of an embodiment, with reference to the attached drawings.

1 shows a block diagram with sensor, evaluation and drive components of the hybrid drive in a vehicle for implementing the method according to the invention.

2 shows a flowchart of a part of an embodiment of the method according to the invention.

In 1 is a hybrid drive 1 shown here specifically a combustion engine 2 and an electric machine. The electric motor 3 is with an energy storage 4 ie connected to a vehicle battery or to a "super-cap". It can be operated as a motor or as an electric generator. In the first case, he is using energy from the energy storage 4 supplies and drives the vehicle, in the second case it acts as a brake and feeds electrical energy into the energy storage 4 back. The connection between the electric motor 3 and the energy storage 4 is therefore represented by two parallel double arrows.

To the energy storage 4 To be able to optimally use the internal combustion engine 2 and the electric motor or generator 3 If necessary, switched on, ie the performance of both drives is coordinated as required. For this purpose, a driving strategy is set up. This is done on the basis of input variables which are detected by sensors and previously stored parameters such as driver type or selected route. The sensors are part of an input block 5 On the one hand, an environment sensing block 6 for the detection of signals and information and on the other hand a computing unit 7 for the pre-evaluation of the recorded quantities.

The environment detection block 6 contains sensors 8th for driver data and vehicle data, the sensors for a navigation system 9 for determining geographic data, a recipient system 10 for receiving remotely transmitted traffic information, including meteorological data, and a memory 11 for route data.

Examples of the data of the sensors 8th for the driver data and vehicle data are the weight, the current performance of the internal combustion engine or the electric motor, the current speed, etc., and quantities that characterize the current driving state, such as the brake pedal operation, the accelerator operation, the lever operation or the storage state of the Energy storage (eg the tank contents or the charge of the battery or the "Super-Caps"). The geographic data of the navigation system 9 are data taken from a digital road map or from a satellite-based system. They include altitude information, speed limits, gradients, curves, traffic light positions, intersections, etc. The data of the receiver system 10 in particular are traffic jams, road closures and accident reports, but also meteorological data such as information on rain and ice. One known system for far-transmitted traffic data is, for example, the RDS-TMC system.

In the storage room 11 contains the data of routes already traveled, which the driver has stored on his own or which have been saved automatically. In the following, it is assumed that the driver indicates when starting a trip via controls, not shown, whether and which of the stored "reference lines" he passes. The details of such a system are known to those skilled in the art and will not be discussed further here.

The input quantities from the environment detection block 6 be in the arithmetic unit 7 with regard to energy, safety, comfort, pollutant emissions, noise and / or driver type-related requirements further processed. These are the values of the navigation system 9 of the receiver system 10 for receiving remotely transmitted traffic information and the sensors 8th for driver data and vehicle data are from the arithmetic unit 7 read in, corresponding to the elements of the environment detection block 6 a subunit 7a for the calculation of energy equivalents, a subunit 7b for the correction of the energy equivalent depending on the type of road used and a subunit 7c for the correction of the energy equivalent depending on the received traffic information and meteorological information such as icy road, fog, rain, wind strength and direction etc. contains. In another subunit 7d the thus calculated and corrected energy profile is adapted to the current route.

The result of calculations in the arithmetic unit 7 gets into a driving strategy block 12 input, which determines, for example, in terms of consumption, the time required, safety, traffic flow, comfort and the determined driver type driving strategy. In the process, the interferences in the drive systems become 2 and 3 , that is optimized in the brake system, in the engine control and / or in the automatic transmission control in terms of deceleration, cruise travel and / or acceleration.

The driving strategy thus determined is determined by the driving strategy block 12 to a central hybrid drive control 16 forwarded by them in switching commands for the drive components 2 and 3 the hybrid drive 1 is implemented.

The implementation of the driving strategy in switching commands for the drive components 2 and 3 the hybrid drive 1 takes place in the embodiment according to 1 depending on manipulated variables that the driver inputs. Thus, the central hybrid drive control has 16 a second input via which they can be used with a command value or driving control block 13 connected, inter alia, a brake pedal 14 and an accelerator pedal 15 includes, over which the driver enters his specifications.

If the manipulated variables are stable for a longer time, then the driving operating strategy that is determined by the driving strategy block 12 was created by the central hybrid drive control 16 accepted. For a short-term change of the manipulated variables, for example because the driver the position of the accelerator pedal 15 has changed, the driving strategy of the central hybrid control 16 is discarded, and it is due to new detection values from the input block 5 and the environment sensing block 6 in it as well as due to new calculations by the arithmetic unit 7 from the driving strategy block 12 set up a new strategy and from the central hybrid drive control 16 accepted or discarded again. This takes place until a stationary state has been reached, in which no further short-term changes occur more.

In 2 an embodiment of the method according to the invention is shown.

In the method for controlling a hybrid drive in dependence on information about a current and an anticipated driving situation, which are detected via in-vehicle and vehicle-external information sources in an electronic automotive system, energy equivalents are calculated in a first calculation block, which are the basis for the control of the hybrid drive 1 represent. The first calculation block corresponds to step 17 in 2 and will be in the arithmetic unit 7a carried out. From the vehicle data, a parameter is calculated, which is composed for example of vehicle weight, payload, efficiency chain and trailer operation. This parameter is required when converting height differences and vehicle braking or accelerations into energy equivalents.

The result of the first calculation block is subsequently corrected in a second calculation block if further influences due to changed traffic conditions exist or are to be expected. In other words, the energy equivalents are corrected depending on the road type, taking into account whether it is a highway or a dirt road, for example. Furthermore, speed limits, curves and intersections are taken into account in this second calculation block. The second calculation block corresponds to step 18 in 2 and will be in the arithmetic unit 7b carried out.

Influences that could not yet be taken into account are used in the following third calculation block. These are, for example, traffic information already in connection with 1 were addressed. For example, in this third calculation block, a further correction of the energy equivalents occurs due to traffic jam messages. But also meteorological data such as ice, temperature, solar radiation and wind flow, which can also be part of the traffic information. The third calculation block corresponds to step 19 in 2 and will be in the arithmetic unit 7c carried out.

Finally, at the in 2 shown embodiment of the method according to the invention carried out an adaptation of the calculated energy equivalents to the driving profile. This means that the energy profile calculated up to this point is determined for a current route. For a forever Recurring route, eg the daily trip to work and back, the energy profile is adjusted with the help of the actually occurred values, ie the driving profile is adapted. Inaccuracies of the present route data or driver habits can be integrated fault-tolerant, ie small deviations from a once stored driving or route profile are disregarded. The fourth calculation block corresponds to step 20 in 2 and will be in the arithmetic unit 7d carried out.

Finally, in step 21 the switching of the drive components 2 and 3 performed. This is the method for controlling the drive components 2 and 3 the hybrid drive 1 stopped, and the process jumps to the correction in step 17 calculated energy equivalents to account for short-term changes in the parameters.

In order to In contrast to the prior art, the adaptation of the switching control of hybrid drives with the associated energy storage at recurring Routes, e.g. the way to work, possible.

in the The following will be a brief example of the method of the invention explained above specified. When descending on an alpine pass road lies the focus on energy recovery, i.e. on the store or the energy storage. Requirement is but the receptivity of the same. This depends but especially with small energy storage from the discharge from, which depends on intermediate acceleration sections. Pass these are not enough to keep the energy storage sufficiently receptive, is also the use of excess energy for example the engine / interior heating conceivable. As a result, cooling is prevented promoted or a heating of the engine without requiring fuel. in the the simplest case, this downhill is purely electric, with the side effect that the internal combustion engine is already warm when starting What is next to a significant emission reduction also to a Wear reduction leads.

1

hybrid drive

2

combustion engine

3

Electric motor / generator

4

energy storage

5

input block

6

Environment detection block

7

Processing unit, 7a Arithmetic unit for calculation of energy equivalent, 7b

Arithmetic unit for road type correction, 7c Arithmetic unit for

Traffic information correction and meteorological correction, 7d

computer unit for adaptation at driving distance

8th

Storage and sensors for Driver data and vehicle data

9

navigation system

10

receiver system for televised ones Traffic information and

meteorological dates

11

Storage for route data

12

Driving strategy block

13

Manipulated variable block

14

brake pedal

15

accelerator

16

central Hybrid drive control

17

first Calculation block: calculation of energy equivalents

18

second Calculation block: correction of energy equivalents due to

Influences of traffic routes

19

third Calculation block: correction of energy equivalents due to

traffic information

20

fourth Calculation block: adaptation to driving profile

21

control the drive components

Claims (4)

Method for controlling a hybrid drive with several drive components ( 2 . 3 . 4 ) in a motor vehicle in dependence on information about a current and an expected driving situation, which are detected by in-vehicle and external to vehicle information sources in an electronic automotive system, depending on this information and energy, safety, comfort, pollutant emissions , noise and / or driver type-related specifications in the electronic motor vehicle system a driving operation strategy for controlling at least one of the plurality of drive components ( 2 . 3 . 4 ), the information comprising travel route data of a route, which are linked to vehicle-specific data such that a route associated energy profile results, which is taken into account in the determination of the driving strategy, the drive components ( 2 . 3 . 4 ) an internal combustion engine ( 2 ) and an electric machine ( 3 ), and depending on the driving strategy, the driving power of the internal combustion engine ( 2 ) and electric machine ( 3 ) is coordinated as required, and wherein the implementation of the driving strategy in switching commands for the internal combustion engine ( 2 ) and the electric machine ( 3 ) as a function of the manipulated variable A driver inputs such that, in the event that the manipulated variables are stable for a long time, the driving strategy is adopted and in the event that a short-term change in the manipulated variables, the driving strategy is discarded and determines a new driving strategy becomes. Method according to claim 1, characterized in that that information as well linked to meteorological data become. Method according to claim 1 or 2, characterized that information as well Driver-specific data linked become. Method according to one of the preceding claims, characterized characterized in that the information about a current and a expected driving situation include traffic information.