WO2011003663A1

WO2011003663A1 - Method for operating a recuperation device of a motor vehicle

Info

Publication number: WO2011003663A1
Application number: PCT/EP2010/056916
Authority: WO
Inventors: Wolfgang Niem; Thomas Huber; Hans-Robert Schneider; Thomas Eymann; Florian Zaunert; Andreas Engelsberg; Christian Prag; Constantino Schillebeeckx
Original assignee: Robert Bosch Gmbh
Priority date: 2009-07-08
Filing date: 2010-05-19
Publication date: 2011-01-13
Also published as: DE102009027553A1

Abstract

In a method for operating a recuperation device of a motor vehicle, which is provided to convert kinetic energy of the motor vehicle into electric energy, the recuperation device is operated depending on information provided by a navigation system of the motor vehicle. In particular when driving downhill, the device checks whether a rolling of the motor vehicle is energetically more favorable than regenerative braking.

Description

description

title

The invention relates to a method for operating a recuperation device of a motor vehicle according to claim 1 and to a control device for a motor vehicle according to claim 6.

State of the art

It is known to equip motor vehicles with navigation systems. Such navigation systems usually have information regarding possible routes within a spatial area. It is also known to equip motor vehicles with recuperation devices to convert a kinetic energy of the motor vehicle into a storable and later usable one

Transform energy form. Such Rekuperationseinrichtungen can convert the kinetic energy of the motor vehicle, for example, into electrical energy. Disclosure of the invention

The object of the present invention is to provide an improved method for operating a recuperation device of a motor vehicle. This object is achieved by a method having the features of claim 1. It is a further object of the invention to provide an improved control device for a motor vehicle. This object is achieved by a control device having the features of claim 6. Preferred developments are specified in the dependent claims. In a method according to the invention for operating a recuperation device of a motor vehicle, which is used to convert a kinetic energy of the vehicle Motor vehicle is provided in an electrical energy, the recuperation device is operated depending on an information provided by a navigation system. Advantageously, this method makes it possible to optimize the operation of the recuperation device for the specific route traveled by the motor vehicle. As a result, the fuel requirement of the motor vehicle can advantageously be reduced, which also leads to a reduced emission of pollutants and lowers the operating costs of the motor vehicle, as a result of which the motor vehicle can be operated more environmentally-friendly, more cost-effectively and more comfortably.

According to one embodiment of the method, the information provided by the navigation system comprises information about a slope lying in the direction of travel of the motor vehicle. In this case, the method has procedural steps for braking the motor vehicle with the recuperation device during the driving of the slope, if this is energetically more favorable, than disengaging a transmission of the motor vehicle during the driving of the slope, otherwise for disengaging the transmission of the motor vehicle during the Driving the slope. Advantageously, thereby an energy that is released while a motor vehicle is driving down a slope, are used optimally. As a result, the fuel requirement of the motor vehicle can advantageously be reduced, which also leads to a reduced pollutant emissions and lowers the operating costs of the motor vehicle. In a further development of the method, the information provided by the navigation system includes information about a length and a slope of the slope lying in the direction of travel of the motor vehicle, the method having method steps for calculating a distance that covers the motor vehicle without an additional drive, if the transmission the motor vehicle is disengaged during the run of the slope, from the length and the slope of the slope, for calculating a first energy, which requires the motor vehicle to cover the same distance, if the transmission of the motor vehicle is not disengaged during the driving of the slope, for calculating a state of charge, to which an accumulator is charged, if the motor vehicle is decelerated while the slope is being negotiated with the recuperation device, from the length and slope of the slope, for calculating a second energy, which is necessary to charge the accumulator to the same state of charge, if the motor vehicle is not decelerated with the recuperation device during the driving of the slope, to disengage the transmission of the motor vehicle during the passage of the suspension, if the second energy is lower than the first energy, and to decelerate the motor vehicle with the Rekuperationseinrichtung during the passage of the slope, if the second energy is greater than the first energy. Advantageously, this method allows optimal use of energy released by driving on the slope.

In another embodiment of the method, the information provided by the navigation system comprises information about a maximum permissible speed, wherein the method comprises steps for determining a speed of the motor vehicle and for braking the motor vehicle with the recuperation device if the speed of the motor vehicle exceeds the maximum permissible speed Speed is. Advantageously, the safety of the vehicle driver can be increased by this method and at the same time an available kinetic energy of the motor vehicle can be utilized.

Appropriately, the method is only performed if the driver of the motor vehicle does not request acceleration of the motor vehicle. Advantageously, this does not affect the ride comfort of the motor vehicle.

An inventive control device for a motor vehicle with a navigation system and a recuperation device for converting a kinetic energy of the motor vehicle into an electrical energy is designed to carry out a method with the features described above. Advantageously, the energy requirement of the motor vehicle can be reduced by such a control device, whereby the pollutant emissions and the operating costs for operating the motor vehicle are reduced.

Particularly preferably, the control device is designed to display on a display device a charge state of a rechargeable battery, a monthly fuel consumption, an amount of fuel saved by the method, and / or a to display the amount of money saved by the procedure. Advantageously, this increases the ride comfort of the motor vehicle and motivates the driver to an energy-saving and cost-saving driving. The invention will now be explained in more detail with reference to the accompanying figures. Showing:

Figure 1 is a schematic block diagram of a motor vehicle; Figure 2 is a schematic flow diagram of a method according to a first

embodiment; and

FIG. 3 is a schematic flow diagram of a method according to a second embodiment.

Embodiments of the invention

1 shows a schematic representation of a block diagram of a motor vehicle 100. The motor vehicle 100 may be, for example, a car or a truck. The motor vehicle 100 has an internal combustion engine 170. The engine 170 is connected to a transmission 160 of the motor vehicle. The engine 170 is also connected to a recuperation device 140. The recuperation device 140 serves to convert a kinetic energy of the motor vehicle 100 into another form of energy that can be stored. The recuperation device 140 may be, for example, an electromotive brake, which is designed to decelerate the motor vehicle 100 and to convert the kinetic energy of the motor vehicle 100 released thereby into electrical energy. The electrical energy can then be stored in an accumulator 150, for example. The accumulator 150 is connected to the recuperation device 140 for this purpose.

The motor vehicle 100 also has a control unit 110, which is connected to the transmission 160, the internal combustion engine 170 and the recuperation device 140. The control unit 110 is configured to control the transmission 160, the internal combustion engine 170 and the recuperation device 140. The controller 1 10 may be formed, for example, as a microcomputer with a running thereon control program.

The motor vehicle 100 further comprises an energy control device 120, which is connected to the control unit 1 10. The energy control unit 120 and the control unit 1 10 may be formed in an alternative embodiment as a common control unit.

The power controller 120 is connected to a navigation system 130. The navigation system 130 has a data memory in which information about possible routes of a region, such as a state or a continent are stored. A driver of the motor vehicle 100 may notify the navigation system 130 of a destination of a destination. The navigation system 130 also has a means for detecting a current position of the motor vehicle 100. The navigation device 130 may then generate a prediction of a route that is likely to be used. Information about this prospective driving route is communicated to the power control unit 120 by the navigation system 130. The information stored in the data memory of the navigation system 130 may include, for example, information about inclines and gradients of the different routes and information about permissible on the different routes maximum speeds.

The power controller 120 is also connected to a display device 180. The display device 180 may be formed, for example, as a screen in the dashboard of the motor vehicle 100. The display device

180 serves to indicate to the driver of the motor vehicle 100 information about the activity of the power controller 120.

The power controller 120 may instruct the controller 110 to perform certain control operations to thereby reduce the power requirements of the motor vehicle

100 to reduce. For this purpose, the energy control unit 120 can use information provided by the navigation system 130 about sections to be traveled by the motor vehicle 100 in the near future. The transmitted by the navigation system 130 to the power controller

Information can be information about one in the direction of travel of the motor vehicle 100 lying slope. For example, the navigation system 130 may notify the power controller 120 that it is anticipated that it will be driving down a hill in one minute. During the driving of the slope, the motor vehicle 100 is accelerated. The energy control unit 120 can now determine measures that are due to the acceleration of the motor vehicle 100 in addition to

Available kinetic energy of the motor vehicle 100 optimally use. For example, the power controller 120 may decide to disengage the transmission 160 of the motor vehicle 100 while driving the slope. As a result, no fuel is consumed while driving on the slope. Alternatively, the energy control device 120 may perform the recuperation

Instructing device 140 during the run of the slope to decelerate motor vehicle 100 and store the electrical energy thereby obtained in accumulator 150, thereby charging accumulator 150. As a result, the accumulator 150 does not need to be charged by means of an alternator, whereby the fuel requirement of the motor vehicle 100 decreases. More preferably, the power controller 120 selects from both options that which provides greater energy savings.

For this purpose, the information provided by the navigation system 130 to the energy control device 120 may include information about a length I and a gradient g of the slope lying in the direction of travel of the motor vehicle 100. The energy controller 120 may then perform a method 200 schematically illustrated in FIG. 2 with reference to a flowchart. In this case, in a first method step 210, the energy control unit 120 calculates from the information provided by the navigation system 130 a distance S that the motor vehicle would travel without an additional drive if the transmission 160 of the motor vehicle 100 is disengaged during the course of the slope. Furthermore, in a second method step 220, the energy control unit 120 calculates a first energy Y which the motor vehicle would need to travel the distance S if the transmission 160 of the motor vehicle is not disengaged during the course of the slope. In a third method step 230, the energy control device 120 calculates a charging state L to which the accumulator 150 of the motor vehicle would be charged if the motor vehicle 100 is decelerated while the slope is approaching the recuperation device 140. In a fourth method step 240, the energy control device 120 calculates a second energy X that would be necessary Accumulator 140 to charge the state of charge L, if the motor vehicle 100 is not decelerated during the running of the slope with the Rekuperationseinrichtung 140. In a fifth method step 250, the energy control device 120 compares the calculated first energy Y with the second calculated energy X. If the second energy X is less than the first energy Y, the energy control device 120 couples the transmission in a sixth method step 260 160 of the motor vehicle 100 during the driving of the slope. If the second energy X is greater than the first energy Y, in a seventh method step 270, the energy control device 120 brakes the motor vehicle 100 while driving the slope with the recuperation device

140 off.

The information transmitted by the navigation system 130 to the energy control unit 120 may also include information about a maximum permissible speed VMAX in the currently traveled section.

The energy controller 120 may use this information in a method 300 schematically illustrated in FIG. 3 according to a second embodiment. In a second method step 320, the energy controller 120 compares the maximum permissible speed VMAX with the current speed VIST of the motor vehicle 100. If the current speed VIST of the motor vehicle 100 is above the maximum permissible speed VMAX, the energy control device 120 brakes the motor vehicle 100 with the recuperation device 140 to the maximum permissible speed VMAX in a third method step 330. The electrical energy generated thereby can be stored in the accumulator 150. In a particularly preferred embodiment, the energy control device 120 performs the described method only if the vehicle driver does not simultaneously request an acceleration of the motor vehicle 100, for example, only when the vehicle driver is not actuating an accelerator pedal of the motor vehicle 100.

According to a preferred embodiment, the energy control device 120 uses the display device 180 in order to display to the vehicle driver of the motor vehicle 100 information about the activity of the energy control device 120. The information displayed on the display device 180 may be, for example a charge state of the accumulator 150, a monthly fuel consumption, an amount of fuel saved by the operation of the power controller 120, and / or an amount of money saved by the operation of the power controller 120. To calculate the amount of fuel saved, the actual fuel consumption of the internal combustion engine 170 of the motor vehicle 100 is determined. The actual fuel consumption is compared to a typical fuel consumption that would have been expected if the energy controller 120 had not taken measures to reduce fuel consumption. The difference between the expected fuel consumption and the actual fuel consumption corresponds to the amount of fuel saved. The amount of fuel saved can be multiplied by a fuel price to obtain the saved amount of money. The fuel price can be specified for example by the driver. Advantageously, the driver is animated by the display of the amount of fuel saved and the amount of money saved to a fuel-efficient driving style.

Claims

claims

1 . Method for operating a recuperation device (140) of a motor vehicle (100),

wherein the recuperation device (140) is provided for converting a kinetic energy of the motor vehicle (100) into an electrical energy, characterized in that

the recuperation device (140) is operated as a function of information provided by a navigation system (130) of the motor vehicle (100).

2. The method according to claim 1,

wherein the information provided by the navigation system (130) includes information about a slope lying in the direction of travel of the motor vehicle (100),

the method comprising the following steps:

Braking the motor vehicle (100) with the recuperation device (140) during the driving of the slope, if this is energetically more favorable, than disengaging a transmission (160) of the motor vehicle (100) during the driving of the slope;

Otherwise disengaging the transmission (160) of the motor vehicle (100) during the driving of the slope.

3. The method according to claim 2,

wherein the information provided by the navigation system (130) comprises information about a length (I) and a gradient (g) of the slope in the direction of travel of the motor vehicle (100),

the method comprising the following steps:

Calculating a distance (S) traveled by the motor vehicle (100) without an additional drive if the transmission (160) of the motor vehicle (100) is decoupled during the course of the slope, from the length (I) and the gradient (g ) of the slope; - calculating a first energy (Y) required by the motor vehicle (100) to travel the distance (S) if the transmission (160) of the motor vehicle (100) is not decoupled during the run of the slope;

Calculating a state of charge (L) to which an accumulator (150) is charged if the motor vehicle (100) is braked while the slope is being negotiated with the recuperation device (140), of the length (I) and the gradient ( g) of the slope;

- Calculating a second energy (X), which is necessary to charge the accumulator (150) to the state of charge (L), if the motor vehicle (100) during the driving of the slope not with the Rekuperationseinrichtung

(140) is decelerated;

- Disconnecting the transmission (160) of the motor vehicle (100) during the passage of the slope, if the second energy (X) is less than the first energy (Y);

- Braking the motor vehicle (100) with the Rekuperationseinrichtung

(140) during the traverse of the slope, if the second energy (X) is greater than the first energy (Y).

4. The method according to any one of the preceding claims,

the information provided by the navigation system comprising information about a maximum permissible speed (VMAX),

the method comprising the following steps:

- determining a speed (VIST) of the motor vehicle (100);

- Braking the motor vehicle (100) with the Rekuperationseinrichtung

(140) if the speed (VIST) of the motor vehicle (100) is above the maximum permissible speed (VMAX).

5. The method according to claim 4,

the procedure being performed only if the driver of the

Motor vehicle (100) does not request acceleration of the motor vehicle (100).

6. Control device (120)

for a motor vehicle (100) having a navigation system (130) and a recuperation device (140) for converting a kinetic energy of the vehicle Motor vehicle (100) into an electrical energy,

characterized in that

the controller (120) is adapted to carry out a method according to one of claims 1 to 5.

7. Control device (120) according to claim 6,

wherein the controller (120) is adapted to be mounted on a display device (180).

a state of charge of an accumulator (150),

a monthly fuel consumption,

an amount of fuel saved by the process

and / or an amount saved by the method

display.