阅读说明：本技术 用于调节驱动系统的温度控制的方法 (Method for regulating the temperature control of a drive system ) 是由 S.格伯特 C.格劳罗克 于 2018-12-12 设计创作，主要内容包括：一种用于调节驱动系统(1)的温度控制的方法；其中驱动系统(1)具有至少一个传动装置(2)和驱动单元(4),传动装置具有用于对传动装置(2)进行温度控制的第一装置(3)；其中依据驱动单元(4)的变化的目标温度(5,6)来运行第一装置(3)；其中如果驱动单元(4)的实际温度(7)至少已经达到第一上边界温度(8),则进行对第一装置(3)的投入运行并且由此进行对传动装置(2)的加热,其中如果驱动单元(4)的实际温度(7)至多相应于第一下边界温度(9),则停止第一装置(3)的运行,其中分别依据目标温度(5,6)的变化,至少将第一上边界温度(8)改变为第二上边界温度(12),或者将第一下边界温度(9)改变为第二下边界温度(13)。(A method for regulating the temperature control of a drive system (1); wherein the drive system (1) has at least one transmission (2) having a first device (3) for temperature control of the transmission (2) and a drive unit (4); wherein the first device (3) is operated as a function of the varying target temperature (5, 6) of the drive unit (4); wherein the first device (3) is put into operation and thus the transmission (2) is heated if the actual temperature (7) of the drive unit (4) has reached at least a first upper boundary temperature (8), wherein the operation of the first device (3) is stopped if the actual temperature (7) of the drive unit (4) corresponds at most to a first lower boundary temperature (9), wherein at least the first upper boundary temperature (8) is changed to a second upper boundary temperature (12) or the first lower boundary temperature (9) is changed to a second lower boundary temperature (13) depending on a change in the target temperature (5, 6), respectively.)

1. A method for regulating the temperature control of a drive system (1); wherein the drive system (1) has at least one transmission (2) having a first device (3) for temperature control of the transmission (2) and a drive unit (4); wherein the first device (3) is operated as a function of a varying target temperature (5, 6) of the drive unit (4); wherein the first device (3) is put into operation and thus the transmission (2) is heated if the actual temperature (7) of the drive unit (4) has reached at least a first upper limit temperature (8), wherein the operation of the first device (3) is stopped if the actual temperature (7) of the drive unit (4) corresponds at most to a first lower limit temperature (9), wherein the upper limit temperature (8, 12) is greater than the lower limit temperature (9, 13) at each time point (10, 11); wherein the method comprises at least the following steps:

a) determining a change in the target temperature (5, 6) from a first target temperature (5) to a second target temperature (6);

b) -changing at least the first upper boundary temperature (8) to a second upper boundary temperature (12) or the first lower boundary temperature (9) to a second lower boundary temperature (13) in dependence of a change in the target temperature (5, 6), respectively, such that the second boundary temperature (12, 13) is different from the first boundary temperature (8, 9).

2. Method according to claim 1, wherein the method is carried out starting from the operation of the first installation (3) and the operation of the first installation (3) is continued if the actual temperature (7) of the drive unit (4) corresponds at least to the first upper limit temperature (8), wherein the operation of the first installation (3) is stopped if the actual temperature (7) of the drive unit (4) corresponds at most to the first lower limit temperature (9).

3. The method according to any of the preceding claims, wherein the second upper boundary temperature (12) tracks the changing target temperature (5, 6) in time until the second upper boundary temperature (12) substantially corresponds to the second target temperature (6).

4. The method according to any of the preceding claims, wherein the second lower boundary temperature (13) tracks the changing target temperature (5, 6) in time.

5. The method according to any of the preceding claims, wherein the difference between the upper boundary temperature (8, 12) and the lower boundary temperature (9, 13) varies in dependence of the speed of change of the target temperature (5, 6).

6. The method according to any one of the preceding claims, wherein a first difference (15) between the upper boundary temperature (8, 12) and the lower boundary temperature (9, 13), which is present at a first point in time (10) at which the actual temperature (7) lies outside a gap (14) between the upper boundary temperature (8, 12) and the lower boundary temperature (9, 13), is smaller than a second difference (16) between the upper boundary temperature (8, 12) and the lower boundary temperature (9, 13), which is present at a second point in time (11) at which the actual temperature (7) lies within the gap (14).

7. Method according to any of the preceding claims, wherein the drive system (1) comprises a switchable cooler (17), wherein the cooler (17) is switched on if the target temperature (5, 6) is lower than the actual temperature (7).

8. Drive system (1) for a motor vehicle (18), wherein the drive system (1) has at least one transmission (2) having a first device (3) for temperature control of the transmission (2) and a drive unit (4) for driving the motor vehicle (18), and a control unit (19), wherein the drive unit (4) is operable at a varying target temperature (5, 6), and wherein the control unit (19) is configured for performing the method according to any one of the preceding claims.

9. The drive system (1) according to claim 8, wherein the drive unit (4) is temperature controllable by means of a liquid (20), wherein the first device (3) and thereby the transmission (2) is temperature controllable by means of the liquid (20); wherein the actual temperature (7) of the drive unit (4) can be determined by means of the liquid (20).

10. A motor vehicle (18) having a drive system (1) according to any one of the preceding claims 8 and 9.

Technical Field

The invention relates to a method for regulating the temperature control of a drive system, in particular for a motor vehicle.

The drive system comprises at least one transmission and a drive unit, the transmission having a first device for temperature control of the transmission.

Background

If the liquid used as coolant is used for heating the component containing frictional losses, in particular after a cold start of the drive system, i.e. in the heating phase of, for example, the drive unit (internal combustion engine or electric machine, etc.), energy (e.g. fuel, electrical energy, possibly harmful substances such as carbon dioxide, etc.) can be saved. In particular in transmissions, friction losses can be reduced by actively heating the transmission. Preferably, the drive unit has priority in thermal management due to high (friction) losses (e.g. in the cylinder crankcase).

In order to heat the transmission, in particular the hot liquid from the cooling jacket of the drive unit is conducted through a heat exchanger in order to heat the transmission liquid. It is also possible for the gear to release excess heat via this path and to dissipate this heat to the environment.

Heating of the gear unit can only be initiated when the liquid reaches or exceeds a specific temperature limit value. Heat can then be released from the drive unit to the transmission. If the fluid temperature drops too much during heating of the actuator, the heating of the actuator is again stopped. The liquid temperature limit value (limit temperature) suitable for this is static and does not change during operation of the drive system.

Disclosure of Invention

The technical problem underlying the present invention is to solve, at least partially, the problems mentioned in the prior art. In particular, a method should be proposed by means of which the energy required for operating the drive system can be reduced.

A method having the features according to claim 1 contributes to solving this technical problem. Advantageous embodiments are the subject matter of the dependent claims. The features mentioned in the claims can be combined with one another in a technically advantageous manner and can be supplemented by explanatory facts from the description and/or details from the drawings, in which further embodiment variants of the invention are shown.

A method for regulating the temperature control of a drive system, in particular for a motor vehicle, is proposed. The drive system has at least one transmission with a first device for temperature control of the transmission and a drive unit. The first device is operated in dependence on the varying target temperature of the drive unit. The first device is put into operation (in particular, a first put-into operation after a cold start of the drive unit) and the gear is thus heated if the actual temperature of the drive unit has reached at least a first upper limit temperature, wherein the operation of the first device is stopped if the actual temperature of the drive unit corresponds at most to a first lower limit temperature. Here, at each time point, the upper boundary temperature is greater than the lower boundary temperature. The method at least comprises the following steps:

a) determining a change in the target temperature from a first target temperature to a second target temperature;

b) at least the first upper boundary temperature is changed to a second upper boundary temperature or the first lower boundary temperature is changed to a second lower boundary temperature in accordance with a change in the target temperature, respectively, such that the second boundary temperature is different from the first boundary temperature.

In particular, the drive unit is temperature controlled by the liquid. The drive unit is, for example, an internal combustion engine, which can be temperature-controlled by means of a water jacket, through which a liquid (e.g. water) flows. In particular, the liquid in the water jacket may be guided through a heat exchanger, so that temperature control of the liquid for the first device is possible.

The first device is used in particular for temperature control of the transmission. Starting from the drive unit, the thermal energy is transferred to the gear by means of the first device. The first device may for example comprise a part of a heat exchanger associated with the transmission for temperature control of a liquid provided for temperature control of the transmission. The first device may also include an actuator fluid that is temperature controlled by a heat exchanger and that is itself used to heat the actuator.

In particular, the drive unit is operated at a varying target temperature. In particular, the target temperature may vary between 80 degrees celsius and 105 degrees celsius, for example. Depending on the operating point of the drive unit, a predetermined target temperature can be defined or predefined, so that the thermal management of the drive system correspondingly controls the actual temperature of the drive unit.

In particular, the first device (and thus the heating of the gear) is only operated when the drive unit has been heated to such an extent that the actual temperature of the drive unit has at least reached the (predefined or stored or predetermined) first upper limit temperature. It can thus be ensured in particular that preferably (substantially) only thermal energy is used for heating the drive unit. In particular, the use of thermal energy for heating the gear mechanism is not provided until the first upper limit temperature is reached, or is not set until then. Thereby, it is possible to achieve a heating of the drive unit as fast as possible, so that friction losses in the drive unit can be minimized as fast as possible.

Preferably, the first device is not operated (and is in particular deactivated) if the actual temperature at most corresponds to the (predefined or stored or predetermined) lower boundary temperature. In this case, it is particularly assumed that preferably (substantially) only the available thermal energy is used for heating for the drive unit.

In particular, the first device is operated or activated if the actual temperature reaches or exceeds the upper limit temperature at least once. As long as the actual temperature does not reach or fall below the lower boundary temperature again, the first device is operated thereafter or subsequently (immediately).

Within the scope of the method, if there is a change of the target temperature to a (predefined) higher, second target temperature, for example, the drive unit or the actual temperature is first of all adjusted in such a way that the actual temperature reaches the changed (second) target temperature (as quickly as possible). For this reason, the upper limit temperature is changed such that the first device is not put into operation (and thus the removal of thermal energy to the gear) for as long as possible. In particular, the upper boundary temperature is set such that it substantially corresponds to the changed target temperature (or is slightly lower than the target temperature, in particular at most 2 kelvin, preferably 1 kelvin lower).

If, for example, there is a change of the target temperature to a lower, second target temperature, the drive unit or the actual temperature is first adjusted such that the actual temperature reaches the changed (second) target temperature (as quickly as possible). For this reason, the lower boundary temperature is changed such that, for example, the first device continues to be operated (and thus the removal of thermal energy to the gear) such that thermal energy can be removed from the drive unit.

In particular, the execution of the method is carried out starting from the operation of the first device. If the actual temperature of the drive unit corresponds at least to the (predefined) upper limit temperature, the first device (and thus the heating gear) continues to be operated, wherein if the actual temperature of the drive unit corresponds at most to the (predefined) lower limit temperature, the operation of the first device is stopped.

Preferably, the second upper boundary temperature follows the changing target temperature in time until the second upper boundary temperature corresponds to the second target temperature (or almost corresponds to the second target temperature, i.e. in particular at most 2 kelvin, preferably at most 1 kelvin).

In particular, the second lower boundary temperature tracks the changing target temperature in time.

Preferably, the lower boundary temperature (during operation) is always lower than the target temperature (currently present).

Specifically, the boundary temperature is changed immediately after the start of the target temperature change. Preferably, the boundary temperature reaches the set final value (i.e. the second boundary temperature is reached starting from the first boundary temperature) within a time interval of at most 10 seconds, in particular within a time interval of at most 5 seconds.

In particular, the difference between the upper and lower boundary temperatures varies in dependence on, in particular in proportion to, the rate of change of the target temperature. In particular, this means that the faster the change in the target temperature proceeds, the smaller the difference is set.

In particular, the difference change is made at the described time intervals with respect to the change in the target temperature.

In particular, the difference may be between at least zero kelvin and at most 10 kelvin. Preferably between at least 1 kelvin and 7 kelvin.

In particular, the change in the difference serves to switch off the first device for heating the gear mechanism when the actual temperature is tracked, so that the actual temperature reaches the upper limit temperature more quickly. If the actual temperature reaches the second target value fast enough, the first device is not necessarily switched off.

In particular, a first difference between the upper and lower boundary temperatures, which is present at the first time point, is smaller than a second difference between the upper and lower boundary temperatures, which is present at the second time point.

At the first point in time, the actual temperature may lie outside the interval between the upper and lower boundary temperatures. At the second point in time, the actual temperature may lie within the interval between the upper and lower boundary temperatures.

In particular, the first difference is at least 0 kelvin and at most 3 kelvin, preferably at most 2 kelvin. In particular, the second difference is at least 5 kelvin and at most 10 kelvin, preferably at most 7 kelvin.

In particular, if the actual temperature is outside the interval between the upper and lower boundary temperatures, the actual temperature matches the second target temperature that has changed. In particular, a small first difference may ensure that the matching may be performed as fast as possible.

In particular, the larger second difference ensures that the first device is operated as long as possible or not at all.

The drive system may comprise a switchable cooler, wherein the cooler is switched on if the target temperature is lower than the first actual temperature.

In particular, the cooler is used to reduce the actual temperature. In particular, the heat energy can be dissipated to the environment by means of a cooler. By switching on the cooler, the actual temperature can be lowered as quickly as possible.

Furthermore, a drive system for a motor vehicle is proposed, wherein the drive system has at least one transmission with a first device for temperature control of the transmission and a drive unit for driving the motor vehicle, and a control unit. The drive unit may be operated at a varying target temperature. The drive system can be operated by the control unit by the method already described. The control unit is configured and/or adapted for performing the method, or may perform the method.

In particular, the drive unit may be temperature-controlled by a liquid (e.g. water), wherein the first device (e.g. the heat exchanger and/or the transmission liquid) and thus the transmission may be temperature-controlled by the liquid; wherein the actual temperature of the drive unit can be determined by the liquid.

Preferably, the drive system has an accessible cooler for temperature control of the liquid.

Furthermore, a motor vehicle is proposed, which has the drive system already described.

The embodiments for the method are equally applicable to the drive system and the motor vehicle, and vice versa.

As a further aspect, a control unit is proposed, which is determined and configured for performing all the steps of the method.

Furthermore, a computer program is proposed, which is determined and configured for carrying out all the steps of the described method. Furthermore, a machine-readable storage medium is proposed, on which a computer program is stored.

It should be noted prophylactically that the numbers ("first", "second", … …) used here are primarily (only) used to distinguish a plurality of similar objects, sizes or processes, i.e. in particular no dependency and/or order of the objects, sizes or processes on one another is mandatory to specify. This is explicitly stated here if dependencies and/or orders should be required, or will be apparent to a person skilled in the art when studying the specifically described design.

Drawings

The invention and the technical field are explained in more detail below with reference to the attached drawings. It should be noted that the present invention should not be limited by the mentioned embodiments. In particular, unless explicitly stated otherwise, some aspects of the facts set forth in the drawings may also be extracted and combined with further constituents and knowledge from the present description. In particular, it should be noted that the drawings and in particular the dimensional ratios shown are purely schematic. In the drawings:

FIG. 1 shows a motor vehicle having a drive system;

FIG. 2 illustrates a graph showing a known method for temperature control of a transmission, wherein a target temperature is increased;

FIG. 3 shows a graph illustrating a method for temperature control of a transmission, wherein a target temperature is increased;

FIG. 4 illustrates a graph showing a known method for temperature control of a transmission, wherein a target temperature is reduced; and

FIG. 5 shows a graph illustrating a method for temperature control of a transmission, wherein a target temperature is reduced.

Detailed Description

Fig. 1 shows a motor vehicle 18 with a drive system 1. The drive system 1 comprises a transmission 2 with a first device 3 for temperature control of the transmission 2, and a drive unit 4 for driving a motor vehicle 18, as well as a control unit 19. The drive unit 4 can be operated with varying target temperatures 5, 6. The drive system can be operated by the control unit 19 by the method already described. The actual temperature 7 of the drive unit 4 can be acquired by the control unit 19. Furthermore, the temperature control of the drive unit 4, the first device 3, the transmission 2 and the cooler 17 can be controlled by the control unit 19.

Fig. 2 shows a diagram illustrating a known method for controlling the temperature of the transmission 2, in which the target temperatures 5, 6 are increased. Temperatures 5, 6, 7, 8, 9, 12, 13 are plotted on the left vertical axis. The state 21 of the first device 3 is plotted on the right vertical axis: "1" here means "in operation", i.e. the heating of the transmission 2 by the first device 3; here, "0" represents "standstill", i.e. no heating of the gear unit 2 by the first device 3 takes place. Time 22 is plotted on the horizontal axis.

Here, the operation of the first device 3 is assumed to be an initial state. There are fixed upper boundary temperatures 8, 12 (see second curve 24) and fixed lower boundary temperatures 9, 13 (see third curve 25). A first curve 23 shows the increase in the target temperature 5, 6 starting from the first target temperature 5 to the second target temperature 6.

If the actual temperature 7 of the drive unit 4 corresponds at least to the upper boundary temperatures 8, 12, the operation of the first device 3 (and thus of the heating gear 2) is continued, wherein if the actual temperature 7 of the drive unit 4 corresponds at most to the lower boundary temperatures 9, 13, the operation of the first device 3 is stopped.

After the target temperatures 5, 6 have risen to the second target temperature 6, the actual temperature 7 is readjusted. However, the actual temperature 7 rises very slowly. This is due to the fact that: thermal energy is continuously transferred from the drive unit 4 to the transmission 2 via the first means 3.

Fig. 3 shows a diagram illustrating a method for controlling the temperature of transmission 2, in which target temperatures 5, 6 are increased. Reference is made to the embodiment of figure 2.

Here, the operation of the first device 3 is also assumed to be the initial state. The actual temperature 7 initially lies in the interval 14 between the first upper boundary temperature 8 and the first lower boundary temperature 9, i.e. there is a second point in time 11.

The first device 3 is operated as a function of the changing target temperatures 5, 6 (first curve 23) of the drive unit 4. The operation of the first device 3 and thus the heating of the transmission 2 is carried out if the actual temperature 7 of the drive unit 4 has at least reached the first upper limit temperature 8, wherein the operation of the first device 3 is stopped if the actual temperature 7 of the drive unit 4 corresponds at most to the first lower limit temperature 9. In this case, at each time point 10, 11, the upper boundary temperature 8, 12 is greater than the lower boundary temperature 9, 13. Within the scope of step a), a change of the target temperature 5, 6 from the first target temperature 5 to the second target temperature 6 is determined. In step b), the first upper boundary temperature 8 is changed to the second upper boundary temperature 12 (second curve 24) and the first lower boundary temperature 9 is changed to the second lower boundary temperature 13 (third curve 25) in dependence on the change in the target temperature 5, 6, respectively, such that the second boundary temperatures 12, 13 differ from the first boundary temperatures 8, 9.

Within the scope of the method, after the target temperature 5, 6 has been changed to the second, higher target temperature 6, the drive unit 4 or the actual temperature 7 is first adjusted in such a way that it reaches the changed second target temperature 6 as quickly as possible (second curve 24). For this reason, the lower boundary temperatures 9, 13 (third curve 25) are changed in such a way that the operation of the first device 3 (and thus the removal of thermal energy to the gear unit 2) is stopped as quickly as possible. Due to the change in the lower boundary temperatures 9, 13, the actual temperature 7 lies for a short time outside the interval 14 between the upper boundary temperatures 8, 12 and the lower boundary temperatures 9, 13. The actual temperature 7 is then below the lower boundary temperatures 9, 13, so that the first device 3 is deactivated. Thus, no thermal energy is conducted out to the gear 2, so that the heating of the drive unit 4 can take place more quickly. The operation of the first device 3 is resumed only when the actual temperature 7 has reached the second upper boundary temperature.

In this case, the second upper boundary temperature 12 follows the changing target temperatures 5, 6 in time until the second upper boundary temperature 12 corresponds to the second target temperature 6 (or almost reaches the second target temperature, if necessary at most 2 kelvin, preferably 1 kelvin, below the second target temperature). The second lower boundary temperature 13 also tracks the changing target temperatures 5, 6 in time. The lower boundary temperatures 9, 13 are always lower than the (currently present) target temperatures 5, 6.

The first device 3 (and thus the heating gear 2) is operated further if the actual temperature 7 of the drive unit 4 corresponds at least to the upper boundary temperatures 8, 12, wherein the operation of the first device 3 is stopped if the actual temperature 7 of the drive unit 4 corresponds at most to the lower boundary temperatures 9, 13.

The boundary temperatures 8, 9, 12, 13 change immediately after the target temperatures 5, 6 start to change. The boundary temperatures 8, 9, 12, 13 reach the set final value (i.e. the second boundary temperature 12, 13 is reached starting from the first boundary temperature 8, 9) within a time interval of approximately 5 seconds.

A first difference 15 existing at the first point in time 10 between the upper boundary temperature 8, 12 and the lower boundary temperature 9, 13 is smaller than a second difference 16 existing at the second point in time 11 between the upper boundary temperature 8, 12 and the lower boundary temperature 9, 13. At a first point in time 10, the actual temperature 7 lies outside the interval 14 between the upper boundary temperatures 8, 12 and the lower boundary temperatures 9, 13. At a second point in time 11, the actual temperature 7 lies within the interval 14 between the upper boundary temperature 8, 12 and the lower boundary temperature 9, 12.

Here, the first difference 15 is approximately 2 kelvin. Here, the second difference 16 is approximately 7 kelvin.

If the actual temperature 7 lies outside the interval 14 between the upper boundary temperature 8, 12 and the lower boundary temperature 9, 13, the actual temperature 7 matches the second target temperature 6 which has changed. Here, the small first difference 15 ensures that the matching can be performed as quickly as possible.

The larger second difference 16 ensures that the first device 3 is operated as long as possible or not at all.

In principle, it can be seen that the differences 15, 16 change as a function of the rate of change of the target temperatures 5, 6 (first curve 23), wherein a timely tracking of the change of the differences 15, 16 with respect to the change of the target temperatures 5, 6 is achieved.

Fig. 4 shows a diagram illustrating a known method for controlling the temperature of the transmission 2, in which the target temperatures 5, 6 are reduced. Reference is made to the embodiment of figure 2.

Here, the operation of the first device 3 is also assumed to be the initial state. A first curve 23 shows the decrease of the target temperatures 5, 6 starting from the first target temperature 5 to the second target temperature 6.

In this case, the operation of the first device 3 is interrupted if the actual temperature 7 of the drive unit 4 corresponds at most to the lower boundary temperatures 9, 13.

The drive system 1 comprises a switchable cooler 17, wherein the cooler 17 is switched on if the target temperature 5, 6 is lower than the actual temperature 7. The heat energy is conducted away to the environment via the cooler 17 (fourth curve 26).

Fig. 5 shows a diagram illustrating a method for controlling the temperature of the transmission 2, in which the target temperatures 5, 6 are reduced. Reference is made to the embodiments of figures 2, 3 and 4.

Here, the operation of the first device 3 is also assumed to be the initial state. The actual temperature 7 initially lies in the interval 14 between the first upper boundary temperature 8 and the first lower boundary temperature 9, i.e. there are two second points in time 11.

As soon as the target temperature 5, 6 changes from the first target temperature 5 to the lower, second target temperature 6, the drive unit 4 or the actual temperature 7 is first adjusted such that it reaches the changed, second target temperature 6 as quickly as possible. For this reason, the lower boundary temperatures 9, 13 are changed such that the first device 3 continues to be operated (and thus the removal of thermal energy to the gear 2) such that thermal energy can be removed from the drive unit 4. The cooler 17 can correspondingly be switched on subsequently (fourth curve 26). Overall, less heat is removed from the drive system 1, so that overall less energy is consumed.

List of reference numerals

1 drive system

2 drive unit

3 first device

4 drive unit

5 first target temperature

6 second target temperature

7 actual temperature

8 first upper boundary temperature

9 first lower boundary temperature

10 first time point

11 second time point

12 second upper boundary temperature

13 second lower boundary temperature

14 space apart

15 first difference

16 second difference

17 cooler

18 motor vehicle

19 control unit

20 liquid

21 state

Time 22

23 first curve

24 second curve

25 third curve

26 fourth curve