JP2020128781A - Vehicle control device and vehicle control method - Google Patents

Abstract

To promptly bring at least either an oil temperature or a liquid temperature close to an optimal temperature.SOLUTION: A controller 50 is a control device of a vehicle which comprises: an engine ENG; a transmission TM provided with a mechanical oil pump 21 driven by the engine ENG and an electric oil pump 22; and an oil cooler 13 which performs heat exchange between cooling liquid W of the engine ENG and hydraulic oil OIL of the transmission TM. The controller 50 executes control to increase a flow rate of the hydraulic oil OIL supplied to the oil cooler 13 by driving the electric oil pump 22 on the basis of a liquid temperature TW and a hydraulic oil temperature TOIL.SELECTED DRAWING: Figure 1

Description

The present invention relates to vehicle control.

Patent Document 1 describes a technique of reducing the rotation speed by restricting the transmission target input rotation speed and suppressing an increase in the oil temperature of the transmission.

JP, 2008-215237, A

There is an appropriate oil temperature for the hydraulic oil of the transmission. Therefore, when the oil temperature is low, it is preferable that the oil temperature of the hydraulic oil be brought close to the appropriate oil temperature as soon as possible. There is also an appropriate liquid temperature for the cooling liquid of the drive source. Therefore, when the liquid temperature is low, it is preferable to bring the liquid temperature of the cooling liquid close to the appropriate liquid temperature as soon as possible.

The present invention has been made in view of such problems, and an object thereof is to quickly bring at least one of the oil temperature and the liquid temperature close to an appropriate temperature.

A vehicle control device according to an aspect of the present invention includes a drive source, a transmission having a mechanical oil pump driven by the drive source, and an electric oil pump, a coolant of the drive source, and hydraulic oil for the transmission. A heat exchanger for exchanging heat, and driving the electric oil pump based on the temperature of the coolant and the temperature of the hydraulic oil It has a control part which performs control which increases the flow of the hydraulic oil supplied.

According to another aspect of the present invention, there is provided a vehicle control method corresponding to the vehicle control device.

According to these aspects, by increasing the flow rate of the hydraulic oil supplied to the heat exchanger, it is possible to increase the heat exchange amount of the heat exchanger that performs heat exchange between the hydraulic oil and the cooling liquid. Therefore, at least one of the oil temperature and the liquid temperature can be brought close to the appropriate temperature quickly.

Further, when the rotation speed of the drive source is increased to increase the flow rate of the mechanical oil pump, the drivability is affected. According to these aspects, however, the electric oil pump driven by the non-drive source is driven. Therefore, according to these aspects, the heat exchange amount of the heat exchanger can be increased without affecting the drivability.

It is a schematic block diagram of a vehicle. It is a figure which shows an example of the control which a controller performs with a flowchart. It is a figure which shows the operation area of the electric oil pump 22.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a vehicle. The vehicle includes an engine ENG, a torque converter TC, a forward/reverse switching mechanism SWM, and a variator VA. In the vehicle, the transmission TM is configured to include a torque converter TC, a forward/reverse switching mechanism SWM, and a variator VA. The transmission TM is an automatic transmission, and is a belt type continuously variable transmission in this embodiment.

The engine ENG constitutes the drive source of the vehicle. The power of the engine ENG is transmitted to the drive wheels via the torque converter TC, the forward/reverse switching mechanism SWM, and the variator VA. In other words, the torque converter TC, the forward/reverse switching mechanism SWM, and the variator VA are provided on the power transmission path from the engine ENG to the drive wheels.

The torque converter TC transmits power via a fluid. In the torque converter TC, the power transmission efficiency is improved by engaging the lockup clutch LU.

The forward/reverse switching mechanism SWM is provided in the power transmission path that connects the engine ENG and the variator VA. The forward/reverse switching mechanism SWM switches the forward/backward movement of the vehicle by switching the rotation direction of the input rotation. The forward/reverse switching mechanism SWM includes a forward clutch FWD/C that is engaged when the forward range is selected, and a reverse brake REV/B that is engaged when the reverse range is selected. When the forward clutch FWD/C and the reverse brake REV/B are released, the transmission TM enters the neutral state, that is, the power cutoff state.

The variator VA constitutes a belt type continuously variable transmission mechanism having a primary pulley PRI, a secondary pulley SEC, and a belt BLT wound around the primary pulley PRI and the secondary pulley SEC. The primary pressure Ppri is supplied to the primary pulley PRI, and the secondary pressure Psec is supplied to the secondary pulley SEC from a hydraulic pressure control circuit 11 described later.

The transmission TM further includes a mechanical oil pump 21 and an electric oil pump 22.

The mechanical oil pump 21 pumps the oil OIL to the hydraulic control circuit 11. The mechanical oil pump 21 is a mechanical oil pump driven by the power of the engine ENG. The electric oil pump 22 pumps the oil OIL to the hydraulic control circuit 11 together with the mechanical oil pump 21 or alone. The electric oil pump 22 is provided on the hydraulic path in parallel with the mechanical oil pump 21 with respect to the hydraulic control circuit 11, and is also provided auxiliary to the mechanical oil pump 21. The oil OIL supplied by the mechanical oil pump 21 and the electric oil pump 22 constitutes hydraulic oil for the transmission TM.

The transmission TM further includes a hydraulic control circuit 11, an oil pan 12, an oil cooler 13, and a controller 50.

The hydraulic control circuit 11 is composed of a plurality of flow paths and a plurality of hydraulic control valves, regulates the oil OIL supplied from the mechanical oil pump 21 and the electric oil pump 22, and supplies it to each part of the transmission TM. The oil OIL supplied to each part of the transmission TM then returns to the mechanical oil pump 21 and the electric oil pump 22 via the oil pan 12 and the oil cooler 13, which are the oil storage portion of the transmission TM.

The oil cooler 13 is a heat exchanger that exchanges heat between the coolant W of the engine ENG and the oil OIL of the transmission TM. The coolant W discharged from the engine ENG and the oil OIL discharged from the oil pan 12 flow into the oil cooler 13. The oil cooler 13 is provided on an oil passage that connects the oil pan 12, the mechanical oil pump 21, and the electric oil pump 22 on the hydraulic path of the transmission TM. Therefore, the oil OIL flowing through the oil cooler 13 subsequently flows into at least one of the mechanical oil pump 21 and the electric oil pump 22. The cooling liquid W flowing through the oil cooler 13 then returns to the engine ENG.

The oil cooler 13 functions not only as a cooler that cools the oil OIL of the transmission TM but also as a warmer that heats the oil OIL of the transmission TM.

When the oil temperature TOIL of the oil OIL of the transmission TM flowing through the oil cooler 13 is higher than the liquid temperature TW of the cooling liquid W of the engine ENG flowing through the oil cooler 13, the oil cooler 13 detects the oil OIL of the transmission TM. It functions as a cooler to cool the.

When the liquid temperature TW of the cooling liquid W of the engine ENG flowing through the oil cooler 13 is higher than the oil temperature TOIL of the oil OIL of the transmission TM flowing through the oil cooler 13, the oil cooler 13 uses the oil OIL of the transmission TM. It also functions as a warmer for heating.

The controller 50 is a controller for controlling the transmission TM, and signals from the sensor switch group 40 indicating various sensor switches are input to the controller 50. The sensor switch group 40 includes, for example, a vehicle speed sensor that detects the vehicle speed VSP, an accelerator opening sensor that detects the accelerator opening APO, an engine rotation speed sensor that detects the rotation speed Ne of the engine ENG, and a brake sensor that detects the brake fluid pressure. Includes an oil temperature sensor for detecting.

The sensor switch group 40 further includes, for example, a primary pressure sensor that detects the primary pressure Ppri, a secondary pressure sensor that detects the secondary pressure Psec, a rotation speed sensor that detects the rotation speed Npri of the primary pulley PRI, and a rotation speed Nsec of the secondary pulley SEC. , A position sensor for detecting the operating position of the gear shift lever, an outside air temperature sensor for detecting the outside air temperature TA of the vehicle, an oil temperature sensor for detecting the oil temperature TOIL of the transmission TM, a liquid temperature TW of the engine ENG. It includes a liquid temperature sensor for detecting. The oil temperature TOIL can be the temperature of the oil OIL at the oil outlet portion of the oil pan 12, for example. The liquid temperature TW can be, for example, the temperature of the cooling liquid W at the cooling liquid outlet of the engine ENG.

These signals are directly input to the controller 50 or via an engine controller or the like. Further, for example, the information of the torque Tq of the engine ENG is input to the controller 50 from an engine controller for controlling the engine ENG. The controller 50 controls the transmission TM based on these signals.

The transmission TM is controlled by controlling the hydraulic control circuit 11 and the electric oil pump 22 based on these signals. The hydraulic control circuit 11 performs hydraulic control of the lockup clutch LU, the forward clutch FWD/C, the reverse brake REV/B, the primary pulley PRI, the secondary pulley SEC, etc. based on the instruction from the controller 50. The electric oil pump 22 can be controlled by controlling an inverter that supplies current to the drive motor of the electric oil pump 22.

By the way, the oil temperature TOIL has an appropriate oil temperature. Therefore, when the oil temperature TOIL is low, it is preferable to bring the oil temperature TOIL close to the appropriate oil temperature as soon as possible. The liquid temperature TW also has an appropriate liquid temperature. Therefore, when the liquid temperature TW is low, it is preferable to bring the liquid temperature TW close to the appropriate liquid temperature as soon as possible.

In consideration of such a situation, in the present embodiment, the controller 50 performs the control described below.

FIG. 2 is a flowchart showing an example of control performed by the controller 50. The controller 50 is configured to have a control unit by being programmed to perform the processing of this flowchart.

In step S1, the controller 50 determines whether the outside air temperature TA is lower than a predetermined temperature TA1. The predetermined temperature TA1 is a value for defining whether or not the amount of heat exchange of the oil cooler 13 needs to be increased when the liquid temperature TW and the oil temperature TOIL are appropriately adjusted, and heat exchange is performed when the outside air temperature TA is less than the predetermined temperature TA1. It is considered necessary to increase the amount. If the determination in step S1 is negative, the process ends, and if the determination is positive in step S1, the process proceeds to step S2.

In step S2, the controller 50 determines whether or not it is in the operation region R of the electric oil pump 22. The operating region R is a region where the flow rate of the oil OIL supplied to the oil cooler 13 is increased by operating the electric oil pump 22, and is set in advance as follows.

FIG. 3 is a diagram showing an operating region R of the electric oil pump 22. In the map shown in FIG. 3, the state point P is determined based on the liquid temperature TW and the oil temperature TOIL, with the minimum value TAMIN of the outside air temperature TA assumed to be used by the vehicle as the minimum value of the liquid temperature TW and the oil temperature TOIL. The liquid temperature TW can be detected by the liquid temperature sensor, and the oil temperature TOIL can be detected by the oil temperature sensor. The liquid temperature TW and the oil temperature TOIL may be, for example, estimated values estimated based on parameters having a correlation with them.

As shown in FIG. 3, the operating region R is set according to the liquid temperature TW and the oil temperature TOIL. The operating region R includes a cooler region R1 and a warmer region R2.

The cooler region R1 is a region where the oil cooler 13 functions as a cooler for the oil OIL of the transmission TM, and the oil temperature TOIL is higher than the liquid temperature TW. The cooler region R1 is further set to a region below a predetermined oil temperature TOIL1 which is the lower limit value of the optimum temperature of the oil temperature TOIL.

The warmer region R2 is a region where the oil cooler 13 functions as a warmer for the oil OIL of the transmission TM, and the liquid temperature TW is higher than the oil temperature TOIL. The warmer region R2 is further set to be a region below a predetermined liquid temperature TW1 which is a lower limit value of an appropriate temperature of the liquid temperature TW.

In general, there are overwhelmingly many situations in which the oil temperature TOIL becomes higher than the liquid temperature TW. However, since the engine ENG generates a large amount of heat when cold, the liquid temperature TW temporarily becomes higher than the oil temperature TOIL.

A prohibited area is provided between the cooler area R1 and the warmer area R2. The prohibited area is sandwiched by two boundary lines in which the isothermal line where the liquid temperature TW and the oil temperature TOIL are equal is offset at equal intervals on both sides of the high oil temperature low liquid temperature side and the low oil temperature high liquid temperature side. Area. In the prohibited area, the operation of the electric oil pump 22 performed based on the map shown in FIG. 3 is prohibited. The prohibited area also serves as a hysteresis area provided between the cooler area R1 and the warmer area R2.

The state point P is included in the prohibited area when the absolute value of the difference ΔT between the liquid temperature TW and the oil temperature TOIL is less than the predetermined difference ΔT1. Therefore, the operating region R is further divided from the prohibited region provided as described above on the condition that the absolute value of the difference ΔT is equal to or larger than the predetermined difference ΔT1. The prohibited region further includes a region where the liquid temperature TW is equal to or higher than the predetermined liquid temperature TW1 and a region where the oil temperature TOIL is equal to or higher than the predetermined oil temperature TOIL1.

Returning to FIG. 2, in step S2, an affirmative determination is made when the state point P is included in the operating region R, and a negative determination is made when the state point P is included in the prohibited region. If the determination is affirmative in step S2, the process proceeds to step S3.

In step S3, the controller 50 operates the electric oil pump 22. In step S3, the controller 50 operates the electric oil pump 22 at intervals. This will be described later.

In step S3, the controller 50 drives the electric oil pump 22 based on the map shown in FIG. 3 to drive the electric oil pump 22 based on the liquid temperature TW and the oil temperature TOIL. The controller 50 drives the electric oil pump 22 in this manner, thereby executing control to increase the flow rate of the oil OIL supplied to the oil cooler 13. Below, the said control is also called oil amount increase control.

By performing the oil amount increase control, the flow rate of the oil OIL flowing through the oil cooler 13 increases, so that heat exchange in the oil cooler 13 is promoted. In step S3, when the state point P is in the cooler region R1, the oil OIL of the transmission TM heats the cooling liquid W of the engine ENG, and when the state point P is in the warmer region R2, the engine ENG is set. The oil OIL of the transmission TM is heated by the cooling liquid W of.

Therefore, in step S3, at least one of the oil temperature TOIL and the liquid temperature TW is quickly brought close to the appropriate temperature by performing the oil amount increase control.

In order to increase the flow rate of the oil OIL supplied to the oil cooler 13 by driving the electric oil pump 22, the mechanical oil pump 21 and the electric oil pump 22 should have a flow rate higher than that required for the operation of the transmission TM. It can be generated by and. Therefore, in step S3, the flow rate of the electric oil pump 22 is determined in consideration of the current flow rate of the mechanical oil pump 21.

In step S4, the controller 50 determines whether the increase rate ΔTOIL of the oil temperature TOIL is equal to or higher than the predetermined rate ΔTOIL1. The predetermined rate ΔTOIL1 is a value for defining a sudden increase in the oil temperature TOIL, and is set in advance. The sudden increase in the oil temperature TOIL occurs, for example, when the accelerator pedal and the brake pedal are simultaneously depressed with the lockup clutch LU released. If a negative determination is made in step S4, the process ends once.

If a positive determination is made in step S1 and step S2 in the subsequent routine, the process proceeds to step S3, and the operation of the electric oil pump 22 is continued. If a negative determination is made in step S4, the process ends. That is, while the positive determination is made in steps S1 and S2 and the negative determination is made in step S4, the operation of the electric oil pump 22 is continued in step S3.

In such a case, the controller 50 operates the electric oil pump 22 at intervals as described above. The interval is provided by prohibiting the drive of the electric oil pump 22 when the electric oil pump 22 continuously operates for a predetermined time SC1 or more. As a result, the electric oil pump 22 is prevented from being operated beyond the continuous operation time, and the electric oil pump 22 is protected.

The continuous operating time of the electric oil pump 22 varies depending on the set flow rate of the electric oil pump 22. Therefore, the predetermined time SC1 can be set based on the set flow rate of the electric oil pump 22, for example.

If a positive determination is made in step S4, the process proceeds to step S5. In step S5, the controller 50 determines whether or not the operating time of the electric oil pump 22 during the rapid increase of the oil temperature TOIL is a predetermined time SC2 or more. The predetermined time SC2 is a determination value for determining whether the electric oil pump 22 continues to operate during the rapid increase in the oil temperature TOIL, and is set in advance. The predetermined time SC2 is set shorter than the predetermined time SC1, and the predetermined time SC1 can be set so as to have a margin of at least the predetermined time SC2 with respect to the continuously operable time.

If the operating time of the electric oil pump 22 during the rapid increase in the oil temperature TOIL is less than the predetermined time SC2, the process ends. In this case, if a negative determination is made in step S4 while the processes of steps S1 to S5 are repeatedly performed, it means that the oil cooler 13 has suppressed the rapid increase in the oil temperature TOIL by heat exchange.

When the operating time of the electric oil pump 22 during the rapid increase in the oil temperature TOIL is equal to or longer than the predetermined time SC2, it is determined that the heat exchange by the oil cooler 13 alone cannot meet the rapid increase in the oil temperature TOIL. In this case, the process proceeds to step S6, and the controller 50 prohibits the operation of the electric oil pump 22. That is, in step S6, the oil amount increase control performed in step S3 is prohibited.

In this case, the oil temperature TOIL can be reduced by a control other than the oil amount increase control such as the torque limit control of the engine ENG. Therefore, in this case, by prohibiting the operation of the electric oil pump 22, energy consumption by the electric oil pump 22 is suppressed.

Also in the case of a negative determination in step S2, the process proceeds to step S6. In step S2, for example, in the map shown in FIG. 3, a negative determination is made even when the oil temperature TOIL becomes equal to or higher than the predetermined oil temperature TOIL1. That is, even when the oil temperature TOIL is equal to or higher than the predetermined oil temperature TOIL1, the oil amount increase control is prohibited. In this case, since the oil temperature TOIL is an appropriate temperature, energy consumption generated by operating the electric oil pump 22 more than necessary is suppressed. After step S6, the process ends once.

Next, the main effects of this embodiment will be described.

The controller 50 includes an engine ENG, a transmission TM having a mechanical oil pump 21 and an electric oil pump 22 driven by the engine ENG, and an oil for exchanging heat between the coolant W of the engine ENG and the oil OIL of the transmission TM. A vehicle control device having a cooler 13 is configured. The controller 50 drives the electric oil pump 22 based on the liquid temperature TW and the oil temperature TOIL, thereby executing control to increase the flow rate of the oil OIL supplied to the oil cooler 13.

According to such a configuration, by increasing the flow rate of the oil OIL supplied to the oil cooler 13, it is possible to increase the heat exchange amount of the oil cooler 13 that performs heat exchange between the oil OIL and the cooling liquid W. Therefore, at least one of the oil temperature TOIL and the liquid temperature TW can be brought close to the appropriate temperature quickly (effects corresponding to claims 1 and 6).

Further, when the rotational speed Ne of the engine ENG is increased to increase the flow rate of the mechanical oil pump 21, drivability is affected. With such a configuration, the electric oil pump 22 driven by the non-driving source is driven. Let Therefore, according to such a configuration, the heat exchange amount of the oil cooler 13 can be increased without affecting the drivability (effects corresponding to claims 1 and 6).

In the oil cooler 13, the greater the difference between the liquid temperature TW and the oil temperature TOIL, the higher the heat exchange effect.

Therefore, when the absolute value of the difference ΔT between the liquid temperature TW and the oil temperature TOIL becomes equal to or greater than the predetermined difference ΔT1, the controller 50 drives the electric oil pump 22 to change the oil OIL supplied to the oil cooler 13. Increase flow rate.

According to such a configuration, the electric oil pump 22 is driven when the difference between the liquid temperature TW and the oil temperature TOIL is large, and the electric oil pump 22 is not driven when the difference is not the case, so that the proper temperature is quickly achieved. The energy consumption by the electric oil pump 22 can be suppressed while achieving the above (effect corresponding to claim 2 ).

The controller 50 prohibits driving of the electric oil pump 22 when the electric oil pump 22 is continuously operated for a predetermined time SC1 or more.

According to such a configuration, it is possible to protect the electric oil pump 22 by providing an interval in the operation of the electric oil pump 22, and it is also possible to achieve energy saving as a secondary effect. Corresponding to the effect).

The controller 50 prohibits the oil amount increase control when the oil temperature TOIL is equal to or higher than the predetermined oil temperature TOIL1.

With such a configuration, when the oil temperature TOIL reaches the appropriate oil temperature, the oil amount increase control can be prohibited and the energy consumption by the electric oil pump 22 can be suppressed (the effect corresponding to claim 4).

The controller 50 prohibits the oil amount increase control when the increase rate ΔTOIL of the oil temperature TOIL is equal to or higher than the predetermined rate ΔTOIL1.

According to such a configuration, the rapid increase of the oil temperature TOIL is suppressed by the control different from the oil amount increase control, and therefore the oil amount increase control is prohibited, so that the energy consumption by the electric oil pump 22 can be suppressed. (Effect corresponding to claim 5).

Although the embodiment of the present invention has been described above, the above embodiment merely shows a part of the application example of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

In the above-described embodiment, the case where the prohibited area is provided between the cooler area R1 and the warmer area R2 has been described. However, the prohibition region may not be specially provided between the cooler region R1 and the warmer region R2. In this case, both the cooler region R1 and the warmer region R2 are expanded to the isotherm of the liquid temperature TW and the oil temperature TOIL. The isotherm can be included in either the cooler region R1 or the warmer region R2.

In the above-described embodiment, the case where the hydraulic path for supplying the oil OIL from the electric oil pump 22 to the oil cooler 13 does not specifically include the valve for supplying the oil OIL to the oil cooler 13 has been described. However, a valve for supplying the oil OIL to the oil cooler 13 may be provided in the hydraulic path for supplying the oil OIL from the electric oil pump 22 to the oil cooler 13.

As such a valve, for example, a bypass valve that bypasses the oil cooler 13 and, when there is a flow rate of oil OIL more than necessary, discharges a flow rate of oil OIL more than necessary and supplies the oil cooler 13 with a bypass valve You can In this case, if the flow rate of the oil OIL is simply increased by the electric oil pump 22 so that the mechanical oil pump 21 and the electric oil pump 22 generate a flow rate higher than the required flow rate, the flow rate of the oil OIL flowing into the oil cooler 13 may be increased. Can be increased.

The hydraulic path for supplying the oil OIL from the electric oil pump 22 to the oil cooler 13 may be provided with a dedicated path and a dedicated valve for sending the oil OIL from the electric oil pump 22 to the oil cooler 13. In this case, the flow rate of the oil OIL flowing into the oil cooler 13 can be increased by driving the electric oil pump 22 and opening the dedicated valve by the oil amount increase control.

In the above-described embodiment, the case where the control unit is realized by the controller 50 has been described. However, the control unit may be realized by, for example, a single controller.

13 Oil cooler (heat exchanger)
21 mechanical oil pump 22 electric oil pump 50 controller (control unit)
ENG engine (drive source)
TM Transmission W Coolant OIL Oil (hydraulic oil)

Claims (6)

Drive source,
A transmission having a mechanical oil pump driven by the drive source and an electric oil pump,
A heat exchanger for exchanging heat between the coolant of the drive source and the hydraulic fluid of the transmission;
A vehicle control device having:
By driving the electric oil pump based on the temperature of the cooling liquid and the temperature of the hydraulic oil, a control unit that executes control to increase the flow rate of the hydraulic oil supplied to the heat exchanger,
A vehicle control device characterized by the above. The control device for a vehicle according to claim 1, wherein
When the absolute value of the difference between the temperature of the cooling liquid and the temperature of the hydraulic oil is equal to or greater than a predetermined difference, the control unit drives the electric oil pump to supply the hydraulic oil to the heat exchanger. Increase the flow rate of
A vehicle control device characterized by the above. The vehicle control device according to claim 1 or 2, wherein
The control unit prohibits driving of the electric oil pump when the electric oil pump is continuously operated for a predetermined time or more,
A vehicle control device characterized by the above. The vehicle control device according to any one of claims 1 to 3,
The control unit prohibits the control when the temperature of the hydraulic oil is equal to or higher than a predetermined oil temperature,
A vehicle control device characterized by the above. The control device for a vehicle according to any one of claims 1 to 4, wherein:
The control unit prohibits the control when the rate of increase in the temperature of the hydraulic oil is equal to or higher than a predetermined rate.
A vehicle control device characterized by the above. A vehicle having a drive source, a transmission having a mechanical oil pump driven by the drive source and an electric oil pump, and a heat exchanger performing heat exchange between the coolant of the drive source and the hydraulic oil of the transmission. Control method of
Driving the electric oil pump based on the temperature of the cooling liquid and the temperature of the hydraulic oil, thereby performing control to increase the flow rate of the hydraulic oil supplied to the heat exchanger,
A method for controlling a vehicle, comprising:

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