Energy supply device for a motor vehicle
阅读说明：本技术 用于机动车的能量供应装置 (Energy supply device for a motor vehicle ) 是由 A·克雷伊齐 于 2018-06-20 设计创作，主要内容包括：提出一种用于机动车的能量供应装置,所述能量供应装置具有高压蓄能装置和用于控制高压蓄能装置的充电和放电过程的控制装置。所述控制装置设置为用于,确定高压蓄能装置的温度并且根据所确定的高压蓄能器装置的温度来调整通过上限和下限定义的预先确定的高压蓄能装置的工作范围。(An energy supply device for a motor vehicle is proposed, which has a high-voltage energy store and a control device for controlling a charging and discharging process of the high-voltage energy store. The control device is provided for determining a temperature of the high-pressure energy store and for adjusting a predetermined operating range of the high-pressure energy store, which is defined by an upper limit and a lower limit, as a function of the determined temperature of the high-pressure energy store.)
1. Energy supply device (10) for a motor vehicle (1), having a high-voltage energy storage device (11) and a control device (12) for controlling a charging and discharging process of the high-voltage energy storage device (11),
it is characterized in that the preparation method is characterized in that,
the control device (12) is provided for determining a temperature of the high-pressure accumulator device (11) and for adjusting a predetermined operating range of the high-pressure accumulator device (11) defined by an upper limit and a lower limit as a function of the determined temperature.
2. The energy supply device (10) according to claim 1, characterized in that the control device (12) is arranged for receiving the present temperature of the high pressure energy storage means (11) from a temperature sensor (13).
3. The energy supply device (10) according to claim 2, characterized in that the control device (12) is provided for receiving the current temperature after a predefined period of time after switching off the motor vehicle (1).
4. The energy supply device (10) according to claim 3, characterized in that the predefined period of time is greater than or equal to 6 hours.
5. The energy supply device (10) according to one of the preceding claims, characterized in that the control device (12) is provided for adjusting the lower limit and/or the predefined time period depending on at least one operating parameter of the motor vehicle (1).
6. The energy supply device (10) according to one of the preceding claims, characterized in that the control device (12) is arranged for adjusting the operating range by adjusting a lower limit and with maintaining an upper limit.
7. The energy supply device (10) according to one of the preceding claims, characterized in that the control device (12) is arranged for adjusting the lower limit to a first value if the determined temperature is below or equal to a predefined temperature threshold (201).
8. The energy supply device (10) according to one of the preceding claims, characterized in that the control device (12) is arranged for adjusting the lower limit to a second value if the determined temperature is above a predefined temperature threshold (201), wherein the first value is higher than the second value.
9. Motor vehicle (1), in particular a passenger car, having an energy supply device (10) according to claims 1 to 8.
10. Method for supplying energy to a motor vehicle (1), wherein the motor vehicle (1) has an energy supply device (10) having a high-voltage energy storage device (11) and a control device (12) for controlling a charging and discharging process of the high-voltage energy storage device (11),
it is characterized in that the preparation method is characterized in that,
determining (301) the temperature of the high-pressure energy storage device (11), and
a predetermined operating range of the high-pressure energy storage device (11), which is defined by an upper limit and a lower limit, is set (302) as a function of the determined temperature of the high-pressure energy storage device (11).
Technical Field
The invention relates to an energy supply device for a motor vehicle. The invention further relates to a motor vehicle, in particular a passenger car, having such an energy supply device, and to a method for supplying energy to a motor vehicle.
Background
High-voltage accumulators, in particular in lithium-ion technology with a nominal voltage of greater than or equal to 60V, can be operated within a predetermined fixed operating range. The operating range is usually selected such that a defined cold start (e.g. starting the internal combustion engine at-25 ℃) must be possible at all times (lower limit of state of charge/minimum storage capacity) on the one hand and sufficient storage capacity (upper limit of state of charge/maximum storage capacity) is available (upward) on the other hand in order to be able to use the energy storage device for braking energy recovery. The fixed operating range is therefore defined by a fixed lower state of charge limit and a fixed upper state of charge limit, in order to be able to carry out a defined cold start at any time, i.e. under all ambient conditions.
However, such a fixed operating range may result in limitations in the use of the energy store which are not required at various temperatures. Thus, the lower state of charge limit at warmer temperatures may be lower than the lower state of charge limit at cooler temperatures.
Therefore, in order to be able to achieve a defined cold start at any time and at the same time reduce the restrictions on the driver, it is known to set the operating interval as a function of the external temperature. However, the temperature of the energy store itself is not always equal to the external temperature, so that the operating range or working range is also limited here, which is not absolutely necessary. The operating range is thus reduced, for example because there is a cooler external temperature, although this is not required for the actual temperature of the energy store.
Disclosure of Invention
Against this background, the object of the invention is to improve the use of the operating range of the energy store.
In this way, an energy supply device for a motor vehicle is proposed, which has a high-voltage energy store and a control device for controlling the charging and discharging process of the high-voltage energy store.
The high pressure energy storage device may be of various types that can be used in motor vehicles. The high-voltage energy storage device may be, for example, a battery of a motor vehicle. The motor vehicle may be a conventional internal combustion engine vehicle, an electric or hybrid vehicle, wherein the high voltage energy storage device supplies energy to an electric drive (motor or starter).
The control device is provided here to determine the temperature of the high-pressure energy store and to set a predetermined operating range of the high-pressure energy store, which is defined by an upper limit and a lower limit, as a function of the determined temperature. The operating range or operating interval is usually selected such that, on the one hand, a defined cold start (lower state of charge limit/lowest storage capacity) must be possible at any time and, on the other hand, sufficient storage capacity (upper state of charge limit/maximum storage capacity) is available (upward).
The adjustment according to the temperature of the high-pressure energy accumulator has the following advantages compared to a shifting of the working range according to the external temperature: the adjustment of the operating range is only carried out if this is also necessary because of the temperature of the high-pressure energy store.
For example if the vehicle is parked in an outer zone with very low outside temperature, although the vehicle itself is thus cooled. However, if the high-voltage energy store is charged, the high-voltage energy store remains warm and an adjustment of the operating range is not necessary. If only the outside temperature is taken into account here, an adjustment of the operating range is necessary, which is not required by the high-pressure energy store itself. This is just prevented by the proposed device.
The corresponding device, for example, the control device, can be implemented in hardware and/or also in software. In the case of a hardware implementation, the respective device can be embodied as a device or as a part of a device, for example as a computer or microprocessor. In the case of a software-related implementation, the respective device can be embodied as a computer program product, as a function, as a routine, as a part of a program code or as an executable object.
In one embodiment, the control device is provided for receiving a current temperature of the high-pressure energy accumulator device from a temperature sensor. The temperature sensor can be located directly on or in the high-pressure energy storage device.
The control device may be configured to receive the current temperature after a predefined period of time after switching off the motor vehicle. The predefined period of time may be, for example, greater than or equal to 6 hours. The predefined period of time is preferably a sufficiently long period of time that the high-pressure accumulator can be waited for to cool down.
According to another embodiment, the control device is provided for determining the lower limit and/or the predefined period of time as a function of at least one operating parameter of the motor vehicle. The at least one operating parameter may be, for example, ambient temperature and/or engine temperature. These operating parameters are used in addition to the determination of the temperature of the high-pressure energy store, for example to adjust the value of the lower limit or to define the time period after the temperature measurement has been carried out.
In another embodiment, the control device is provided for adjusting the working range by adjusting the lower limit and while maintaining the upper limit. This means that the operating range is expanded or reduced as a function of the temperature of the high-pressure energy store.
The control means may be arranged to adjust the lower limit to a first value if the determined temperature is below or equal to a predefined temperature threshold. The temperature threshold can be between-15 ℃ and-25 ℃. The first value may also be referred to as a cold value.
In another embodiment, the control device is configured to adjust the lower limit to a second value if the determined temperature is above a predefined temperature threshold. Preferably, the first value is higher than the second value.
This means that the lower limit is shifted upwards when the temperature of the high-pressure energy storage device is below a temperature threshold (e.g. the minimum energy holding capacity SoCmin(State of Charge) to 18%) and move downward (e.g., SoC minimum energy reserve) when the temperature of the high pressure accumulator is above the temperature thresholdminMove to 13%). Thus, the working range is inIn one case smaller (e.g., 82% of the total energy range) and in a second case larger (e.g., 87% of the total energy range).
According to a further aspect, a motor vehicle having an energy supply device as described above is proposed. The motor vehicle may in particular be a passenger car.
According to a further aspect, a method for supplying energy to a motor vehicle is proposed, wherein the motor vehicle has a high-voltage energy store and a control device for controlling a charging and discharging process of the high-voltage energy store. The method has the following steps: the temperature of the high-pressure energy store is determined, and a predetermined operating range of the high-pressure energy store, which is defined by an upper limit and a lower limit, is set as a function of the determined temperature of the high-pressure energy store.
The embodiments and features described for the proposed apparatus apply accordingly to the proposed method.
Furthermore, a computer program product is proposed, which has a program code configured to cause the implementation of the method set forth above on a computer.
The computer program product, for example the computer program means, can be provided or delivered, for example, as a storage medium (e.g. memory card, USB-disk, CD-ROM, DVD) or in the form of data downloadable from a server over a network. This may be achieved, for example, in a wireless communication network by communicating corresponding data with a computer program product or a computer program means.
Further possible implementations of the invention also include combinations of features or embodiments not explicitly mentioned before or below in relation to the embodiments. The person skilled in the art will also add various aspects as improvements and supplements to the corresponding basic forms of the invention here.
Further advantageous embodiments and aspects of the invention are the subject matter of the dependent claims of the invention and of the embodiments described below. The invention is explained in more detail below with the aid of preferred embodiments and with reference to the drawings.
Drawings
Fig. 1 shows a schematic block diagram of a motor vehicle with an energy supply device;
FIG. 2 illustrates an exemplary flow of charging the energy delivery device of FIG. 1; and
fig. 3 shows a schematic flow diagram of a method for supplying energy to a motor vehicle.
Detailed Description
In the figures, identical or functionally identical components are provided with the same reference symbols, unless otherwise specified.
Fig. 1 shows a
In order to ensure a reliable cold start of the
The high-pressure energy accumulator device 11 is operated in an operating range or operating range which is selected such that, on the one hand, a defined cold start (for example, a start of the internal combustion engine at-25 ℃) (lower limit/lowest storage capacity, hereinafter referred to as lower limit) must be possible at any time and, on the other hand, sufficient storage capacity (upper limit/maximum storage capacity) must be available (upward) in order to be able to use the energy accumulator for recuperation of braking energy.
In order to optimally utilize the operating range of the high-pressure energy accumulator 11, the
An exemplary flow of charging and moving the lower limit is shown in fig. 2. The dashed arrows represent the temperature profile of the high-pressure energy accumulator unit 11 when the
First, the high-pressure accumulator device 11 is operated at the lower limit of the operating range at the value W. At this value W, the lower limit of the operating range of the high-pressure energy accumulator 11 is set to its minimum value, for example, an energy reserve of 13%.
If the
During the next parking, the lower limit K is now used. This applies to lower temperatures, since the lower limit of the operating range of the high-pressure accumulator device 11 is set here to a higher value, for example, an energy reserve of 18%. This lower limit K is now used as long as the temperature of the high-pressure energy store 11 after parking is in the
Fig. 3 shows a method for supplying energy to the
in a
Next, in a
The proposed device makes it possible to optimally utilize the operating range of the high-pressure energy store, since the operating range of the high-pressure energy store is adjusted not using an external temperature, which may be irrelevant, but using the actual temperature of the high-pressure energy store.
Although the present invention has been described by means of various embodiments, the present invention can be variously modified.
List of reference numerals
1 Motor vehicle
10 energy supply device
11 high-pressure energy storage device
12 control device
13 temperature sensor
201 temperature threshold
202. 203 temperature range
301-302 method steps
K. Lower limit of W