CN220390985U - Cooling system of main drive motor of automobile and automobile - Google Patents

Abstract

The utility model provides a cooling system of a main drive motor of an automobile and the automobile. According to the cooling system of the automobile main drive motor, the oil cooling heat exchange loop is arranged to cool the main drive motor, and meanwhile, the water cooling heat exchange loop and the oil cooling heat exchange loop are arranged to conduct heat exchange, so that the circulation heat dissipation of the whole cooling system can be realized, and the heat dissipation efficiency of the main drive motor is improved.

Description

Cooling system of main drive motor of automobile and automobile

Technical Field

The utility model relates to the technical field of cooling systems of main drive motors, in particular to a cooling system of an automobile main drive motor. The utility model also relates to an automobile for cooling the main drive motor through the cooling system of the main drive motor of the automobile.

Background

Electric vehicles have increasingly high performance requirements, especially for range. The economic measure of prolonging the driving range is to improve the efficiency of the electric drive system, so that the electric drive system works in a reasonable temperature environment to improve the power density to the maximum extent.

At present, the motor cooling mode of the electric automobile is mainly water cooling, but the motor cooling mode has the problem that a heat source cannot be directly cooled, the heat dissipation efficiency is low, and the efficiency improvement and the power density improvement of an electric drive system are limited. Compared with a water-cooled driving motor, the oil-cooled driving motor has the advantages of compact structure and higher efficiency, the oil-cooled driving motor can directly contact with a motor heating component to cool a motor rotor and a motor stator in an immersed mode, the heat dissipation effect is relatively better, and an oil medium has the advantages of good insulativity, no magnetic conduction, no electric conduction, low freezing point, high boiling point and the like, and has no influence on a motor magnetic circuit, so that oil is generally selected as the medium for internal direct cooling.

However, driving of the high-speed motor also results in an increase in the stirring speed, and there is a risk of too fast a temperature rise of the lubricating oil. When the temperature of the lubricating oil in the main drive motor rises to a certain limit value, the lubricating oil is caused to deteriorate, thereby causing failure of the drive train.

Disclosure of Invention

In view of the foregoing, the present utility model is directed to a cooling system for a main driving motor of an automobile, so as to improve the cooling efficiency of the main driving motor.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a cooling system of a main drive motor of an automobile comprises an oil cooling heat exchange loop and a water cooling heat exchange loop;

the oil cooling heat exchange loop is provided with an oil circulating driving unit and a main driving motor which are connected through an oil cooling pipeline;

the water-cooling heat exchange loop is provided with a water circulation driving unit and an intercooler which are connected through a water-cooling pipeline;

and a heat exchange unit for exchanging heat between the oil-cooling heat exchange loop and the water-cooling heat exchange loop is arranged between the oil-cooling heat exchange loop and the water-cooling heat exchange loop.

Further, the heat exchange unit is an oil cooling exchanger;

the oil liquid circulation driving unit, the main driving motor and an oil cooling channel in the oil cooling exchanger are connected in series to form the oil cooling heat exchange loop;

and the water circulation driving unit, the intercooler and the water cooling channel in the oil cooling exchanger are connected in series to form the water cooling heat exchange loop.

Further, the oil circulation driving unit comprises an oil pump.

Further, a filter is integrated in the oil pump;

the filter is arranged at the oil inlet of the oil pump, or the filter is arranged at the outlet of the oil storage cavity of the oil pump.

Further, an oil pump controller is integrated on the oil pump, and the oil pump controller is electrically connected with the oil pump;

a temperature detection unit for monitoring the temperature of the rotor is arranged in the main drive motor, and the temperature detection unit is connected with the oil pump controller;

and the temperature information sent to the oil pump controller by the temperature detection unit is received, and the oil pump controller controls the oil pump to act.

Further, the water circulation driving unit is a cooling water pump.

Furthermore, an expansion kettle is connected in series in the water-cooling heat exchange loop, and the expansion kettle is connected in series between the cooling water pump and the intercooler through the water-cooling pipeline.

Further, a heat radiating unit for radiating the intercooler is arranged on one side of the intercooler.

Further, the heat radiating unit is a heat radiating fan arranged at one side of the intercooler.

Compared with the prior art, the utility model has the following advantages:

according to the cooling system of the automobile main drive motor, the oil cooling heat exchange loop is arranged to cool the main drive motor, and meanwhile, the water cooling heat exchange loop and the oil cooling heat exchange loop are arranged to conduct heat exchange, so that the circulation heat dissipation of the whole cooling system can be realized, and the heat dissipation efficiency of the main drive motor is improved.

In addition, the heat exchange unit is arranged as an oil cooling exchanger, and the oil circulation driving unit comprises an oil pump, and is mature in structure and convenient to arrange. The filter is integrated in the oil pump, so that the impurity filtering of the cooling oil can be conveniently carried out, the cleanliness of the cooling oil is ensured, and the smooth circulation and cooling effect of the cooling oil are improved.

The oil pump is integrated with an oil pump controller so as to accurately control the oil pump to work according to a preset target. The temperature detection unit is arranged in the main drive motor and is used for detecting the temperature of the rotor, so that the working state of the oil pump can be controlled conveniently. The water circulation driving unit is a cooling water pump, so that the water circulation driving unit is convenient to set. An expansion kettle is connected in series in the water-cooling heat exchange loop, so that cold water can be stored conveniently for heat exchange circulation, a radiating unit is arranged on one side of the intercooler, the intercooler can be radiated conveniently, the radiating unit is arranged as a radiating fan, and the water-cooling heat exchange loop is simple in structure and convenient to set.

Another object of the present utility model is to propose a motor vehicle whose main drive motor is cooled by a cooling system of the motor vehicle main drive motor as described above.

Compared with the cooling system of the main driving motor of the automobile in the prior art, the cooling system of the main driving motor of the automobile has the same beneficial effects and is not repeated here.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic diagram of a cooling system of an automotive main drive motor according to an embodiment of the present utility model.

Reference numerals illustrate:

1. an oil pump; 101. a pump head; 102. an oil pump motor; 103. an oil pump controller; 104. a filter; 2. an oil-cooled exchanger; 201. a water inlet; 202. a water outlet; 3. a main drive motor; 4. an intercooler; 401. a heat radiation fan; 5. a cooling water pump; 6. an expansion kettle.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present utility model, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in combination with specific cases.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

The embodiment relates to a cooling system of a main drive motor of an automobile, which comprises an oil cooling heat exchange loop and a water cooling heat exchange loop in the whole structure as shown in fig. 1. The oil cooling heat exchange loop is provided with an oil circulating driving unit and a main driving motor 3 which are connected through an oil cooling pipeline. And the water-cooled heat exchange circuit is provided with a water circulation driving unit and an intercooler 4 which are connected through water-cooled pipelines. A heat exchange unit for exchanging heat between the oil-cooling heat exchange loop and the water-cooling heat exchange loop is arranged between the oil-cooling heat exchange loop and the water-cooling heat exchange loop.

The cooling system of the automobile main drive motor of the embodiment cools the main drive motor 3 by arranging the oil cooling heat exchange loop, and meanwhile, the water cooling heat exchange loop and the oil cooling heat exchange loop are arranged for heat exchange, so that the circulation heat dissipation of the whole cooling system can be realized, and the heat dissipation efficiency of the main drive motor 3 is improved.

Based on the above design concept, an exemplary structure of the cooling system of the main driving motor of the automobile of this embodiment is shown in fig. 1, and the oil circulation driving unit, the main driving motor 3 and the oil cooling channel in the oil cooling exchanger 2 are connected in series to form an oil cooling heat exchange circuit.

Preferably, the oil circulation driving unit includes an oil pump 1, the specific oil pump 1 includes a pump head 101 and an oil pump motor 102, and the oil pump motor 102 can drive the pump head 101 to pump cooling oil to the main driving motor 3.

In order to ensure the cleanliness of the cooling oil, in this embodiment, as a preferred embodiment, a filter 104 is integrated in the oil pump 1, and the filter 104 is disposed at the oil inlet of the oil pump 1, so that the cooling oil entering the oil pump 1 can be filtered, and smooth circulation of the cooling oil is ensured. Alternatively, the filter 104 may be further disposed at an outlet of the oil storage chamber of the oil pump 1, so that the cleanliness of the cooling oil entering the main driving motor 3 is ensured, and the cleaning effect of the main driving motor 3 is improved.

In addition, in the present embodiment, as shown in fig. 1, an oil pump controller 103 is integrated on the oil pump 1, and the oil pump controller 103 is electrically connected to the oil pump 1 for driving the oil pump 1 to operate in a preset target state. Meanwhile, a temperature monitoring unit for monitoring the temperature of the rotor, for example, a temperature sensor described below, which is connected to the oil pump controller 103, is provided in the main drive motor 3. Temperature information sent from the temperature detection unit to the oil pump controller 103 is received, and the oil pump controller 103 controls the operation of the oil pump 1.

It should be noted that, the working rotation speed of the oil pump 1 is controlled by the temperature of the inner rotor of the main driving motor 3, after the temperature sensor in the main driving motor 3 monitors the current temperature of the rotor, temperature information is transmitted to the oil pump controller 103, the rotation speed of the oil pump 1 is controlled by the oil pump controller 103, a certain amount of cooling oil is pumped into the main driving motor 3, the cooling oil soaks the hottest rotor part in the main driving motor 3, and heat is taken away through the circulation of the cooling oil, so that the cooling effect is achieved. In order to avoid frequent fluctuation of the rotation speed of the oil pump 1, the speed regulation is controlled to be stable for a period of time, and then the rotation speed is controlled to be increased and decreased.

The cooling oil enters the main drive motor 3 for cooling, then enters the heat exchange unit, and the cold water entering the heat exchange unit through the water cooling heat exchange loop exchanges heat with the heat exchange unit. The heat exchange unit is preferably an oil-cooled exchanger 2, and a water inlet 201 and a water outlet 202 are arranged on the oil-cooled exchanger 2. And, the water circulation driving unit, the intercooler 4 and the water cooling channels in the oil cooling exchanger 2 are connected in series to form a water cooling heat exchange loop.

As a preferred embodiment, the water circulation driving unit is a cooling water pump 5. The cooling water pump 5 is used for pumping cold water into the oil-cooled exchanger 2, after the oil in the oil-cooled exchanger 2 and the cold water complete heat exchange, the cold water enters the intercooler 4 to complete heat dissipation, and the cold water is circulated into the cooling water pump 5 again to prepare for the next stroke.

Wherein, be equipped with the radiating element that is used for radiating to intercooler 4 in one side of intercooler 4 to in radiating the external atmosphere with the heat, accomplish the heat dissipation. And preferably, the heat dissipation unit is a heat dissipation fan 401 arranged at one side of the intercooler 4, and the structure is simple and the arrangement is convenient. It is understood that the heat dissipating unit may be configured as other heat dissipating structures.

In addition, an expansion kettle 6 is connected in series in the water-cooling heat exchange loop, and the expansion kettle 6 is connected in series between the cooling water pump 5 and the intercooler 4 through a water-cooling pipeline. The water after heat exchange and cooling by the intercooler 4 finally enters the expansion kettle 6 for storage, and meanwhile, a sufficient water source is provided for cold water entering the main driving motor 3.

In the cooling system of the main drive motor of the automobile of the embodiment, when the cooling system works, the temperature detection unit in the main drive motor 3 detects the temperature of the rotor and transmits temperature information into the oil pump controller 103, the oil pump controller 103 controls the oil pump 1 to pump cooling oil into the main drive motor 3, the cooling oil infiltrates the rotor and exchanges heat with the rotor, and oil liquid after completing heat exchange enters the oil-cooling exchanger 2.

At this time, the cooling water pump 5 pumps the cold water in the expansion kettle 6 from the water inlet 201 of the oil-cooled exchanger 2, and after the heat exchange between the oil and the cold water is completed, the water flows out from the water outlet 202 of the oil-cooled exchanger 2, enters the intercooler 4 through the water cooling pipeline, the heat dissipation fan 401 in the intercooler 4 completes the heat exchange between the water flow and the atmosphere, the final heat dissipation process is completed, and the cooled cold water is recycled to the expansion kettle 6 for storage.

It should be noted that, the power-on logic before the operation of the automobile is generally that the low-voltage power-on is completed and then the high-voltage power-on is performed, so that: the whole vehicle firstly supplies power to the oil pump 1, and the main drive motor 3 is electrified. However, the two are not necessarily operated, but the power supply is a necessary condition for the operation, and the starting operation condition is also required to be satisfied. The conditions for the operation of the main drive motor 3 are: ignition (READY) +gear (D or R), while the oil pump 1 operating conditions are two: ignition (READY) is pre-lubricated for a period of time and is deactivated.

The cooling oil in the main driving motor 3 is deposited and the activity is reduced because the oil pump 1 does not work, and the movable parts such as the motor bearing and the like lack lubrication because the lubricating oil is not circulated, if the main driving motor 3 is started instantly, dry grinding is caused. Therefore, the main drive motor 3 needs to complete the pre-lubrication work after the oil pump 1 receives the ignition signal before working each time.

The control strategy for the oil pump 1 in this embodiment is as follows:

1) When the vehicle runs, the whole vehicle needs to be ignited, a key is opened to START, then the vehicle enters a READY state, an ignition signal (the READY state) is used as a signal for pre-lubrication, and the oil pump 1 performs pre-lubrication at n0 rotation speed for t0 seconds; (within t0 seconds, if the power-down is terminated, and if the vehicle is in gear within t0 seconds, entering a vehicle control strategy, and controlling according to the following 2); if no other instruction exists within t0 seconds, the operation time is stopped; to generally takes 10-20 seconds, and is specifically calibrated according to the situation).

2) When the driving rotation speed is more than or equal to 10rpm (a smaller value is selected to represent that the main driving motor 3 starts to work, and 0 is not selected to serve as the main driving motor 3 to start to work, because zero drift or errors exist in the rotation speed sensor, and errors exist in the rotation speed of the main driving motor 3), the motor is started at the lowest rotation speed n0 immediately.

3) According to different temperatures of the main drive motor 3, the oil pump 1 is controlled to work at different rotating speeds:

(1) when the temperature T of the main drive motor 3 is more than or equal to T1 and the continuous duration period is more than or equal to T1, the oil pump controller 103 controls the oil pump 1 to work at n1 rotation speed;

(2) when the temperature T of the main drive motor 3 is more than or equal to T2 and the continuous duration period is more than or equal to T2, the oil pump controller 103 controls the oil pump 1 to work at n2 rotation speed;

(3) when the temperature T of the main drive motor 3 is more than or equal to T3 and the continuous duration period is more than or equal to T3, the oil pump controller 103 controls the oil pump 1 to work at n3 rotation speed;

(4) when the temperature T of the main drive motor 3 is more than or equal to T4 and the continuous duration period is more than or equal to T4, the oil pump controller 103 controls the oil pump 1 to work at the n4 rotating speed.

The control of the oil pump 1 to increase the speed is performed in the order of the above (1) to (4), and the control of the oil pump to decrease the speed is performed in the reverse process, and the time period is also used as a judgment condition to avoid the occurrence of the fluctuation of the rotation speed, the noise, and the like.

Wherein: t1 is more than T2 and less than T3 and less than T4; n0 is more than n1 is more than n2 is more than n3 is less than n4; t1, t2, t3 and t4 are set according to the temperature resistance level of the main drive motor 3, and the duration is set for 3 seconds generally; n4 is the maximum rotational speed of the oil pump 1. Generally, four rotating speed gradients can meet the heat dissipation requirement, and excessive rotating speed gradient control is too complex and impractical. Of course, more gradients can be designed according to the working condition of the main drive motor 3, the rotating speed range, overload capacity and the like of the oil pump 1, but the method is similar.

In addition, after the whole vehicle is powered down by high voltage, if the temperature of the main driving motor 3 is still higher than T1, the oil pump 1 and the external water-cooling heat exchange circuit work for a period of time in a delayed mode, so that the main driving motor 3 is stopped after the temperature is lower than a threshold value.

The cooling system of the automobile main drive motor is internally provided with the oil cooling heat exchange loop, and simultaneously combines the external water cooling heat exchange loop to control the system, so that the advantages of the oil cooling motor are brought into play, and the oil cooling heat exchange loop and the external water cooling heat exchange loop jointly cool the main drive motor 3 in a heat dissipation mode, so that the cooling effect is better.

Example two

The present embodiment relates to an automobile whose main drive motor 3 is cooled by the cooling system of the automobile main drive motor in the first embodiment.

The automobile of this embodiment cools the main driving motor 3 by adopting the cooling system of the automobile main driving motor in the first embodiment, which can be beneficial to improving the cooling efficiency of the main driving motor 3 and improving the overall use experience of the automobile.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. A cooling system of a main drive motor of an automobile is characterized in that:

the device comprises an oil cooling heat exchange loop and a water cooling heat exchange loop;

the oil cooling heat exchange loop is provided with an oil circulating driving unit and a main driving motor (3) which are connected through an oil cooling pipeline;

the water-cooling heat exchange loop is provided with a water circulation driving unit and an intercooler (4) which are connected through a water-cooling pipeline;

and a heat exchange unit for exchanging heat between the oil-cooling heat exchange loop and the water-cooling heat exchange loop is arranged between the oil-cooling heat exchange loop and the water-cooling heat exchange loop.

2. The cooling system for an automotive main drive motor according to claim 1, characterized in that:

the heat exchange unit is an oil cooling exchanger (2);

the oil circulation driving unit, the main driving motor (3) and the oil cooling channel in the oil cooling exchanger (2) are connected in series to form the oil cooling heat exchange loop;

the water circulation driving unit, the intercooler (4) and the water cooling channel in the oil cooling exchanger (2) are connected in series to form the water cooling heat exchange loop.

3. The cooling system for an automotive main drive motor according to claim 2, characterized in that:

the oil circulation driving unit comprises an oil pump (1).

4. A cooling system for an automotive main drive motor according to claim 3, characterized in that:

a filter (104) is integrated in the oil pump (1);

the filter (104) is arranged at the oil inlet of the oil pump (1), or the filter (104) is arranged at the outlet of the oil storage cavity of the oil pump (1).

5. A cooling system for an automotive main drive motor according to claim 3, characterized in that:

an oil pump controller (103) is integrated on the oil pump (1), and the oil pump controller (103) is electrically connected with the oil pump (1);

a temperature detection unit for monitoring the temperature of the rotor is arranged in the main drive motor (3), and the temperature detection unit is connected with the oil pump controller (103);

and temperature information sent to the oil pump controller (103) by the temperature detection unit is received, and the oil pump controller (103) controls the oil pump (1) to operate.

6. The cooling system for an automotive main drive motor according to claim 2, characterized in that:

the water circulation driving unit is a cooling water pump (5).

7. The cooling system for an automotive main drive motor according to claim 6, characterized in that:

an expansion kettle (6) is connected in series in the water-cooling heat exchange loop, and the expansion kettle (6) is connected in series between the cooling water pump (5) and the intercooler (4) through the water-cooling pipeline.

8. A cooling system for an automotive main drive motor according to any one of claims 2 to 7, characterized in that:

one side of the intercooler (4) is provided with a heat dissipation unit for dissipating heat of the intercooler (4).

9. The cooling system for an automotive main drive motor according to claim 8, characterized in that:

the heat radiating unit is a heat radiating fan (401) arranged on one side of the intercooler (4).

10. An automobile, characterized in that:

the main drive motor (3) of the motor vehicle is cooled by a cooling system of the main drive motor according to any one of claims 1-9.