Blower drive motor control system and control method thereof, automobile air conditioning assembly

Abstract

The application provides a kind of blower drive motor control system and its control method, automobile air conditioning assembly, belong to air conditioning field, wherein the control system, including drive motor, the U-phase lead-out wire, V-phase lead-out wire and W-phase lead-out wire of the stator winding of drive motor are connected to neutral point by first relay controllable collection to form the star connection mode of blower, U-phase lead-out wire and V-phase lead-in wire, V-phase lead-out wire and W-phase lead-in wire, W-phase lead-out wire and U-phase lead-in wire are respectively formed controllable connection by second relay to form the delta connection mode of blower.The application switches through first relay and second relay to control blower in the delta connection mode when the power supply voltage of battery is lower than set voltage and blower runs high wind gear, to ensure that blower runs stably at high speed, and prevent blower motor from abnormal stop, so that air conditioning system runs more stably.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of air conditioning, and particularly relates to a blower driving motor control system and a control method thereof, and an automobile air conditioning assembly. BACKGROUND

[0002] The blower is an important component of the automobile air conditioning system HVAC, and its function is to push air to flow in the air duct of the air conditioning system to realize air circulation between the outside and the vehicle cabin and cold / warm air exchange. The rotation speed of the air conditioning blower directly determines the size of the generated air flow. In order to blow out different sizes of air flow under different conditions, the rotation speed of the blower needs to be controlled. At present, the traditional brush DC motor is used for the air conditioning blower of most domestic vehicle models, but it has the problems of commutation, easy spark generation, large noise, and frequent maintenance of carbon brush wear. In recent years, with the development trend of low carbonization, environmental protection and intelligentization of automobiles, the air conditioning blower has gradually applied brushless DC motor to replace the traditional brush DC motor.

[0003] The existing automobile air conditioning brushless blower is powered by a power storage battery, and the power storage battery has a wide voltage Up range (generally 9V-16V). When the brushless blower operates at the highest speed and the wind resistance increases, the load increases, the current increases, and the operating voltage Us of the motor also increases with the increase of the current. At this time, Us (the operating voltage of the motor) > Up (the voltage of the power storage battery), the motor will abnormally stop, and the running stability of the air conditioning system is poor. SUMMARY

[0004] Therefore, the present application provides a blower driving motor control system and a control method thereof, and an automobile air conditioning assembly, which can solve the technical problems that the rotation speed of the blower motor in the prior art increases the operating voltage of the motor to be greater than the power supply voltage of the storage battery, the motor abnormally stops, and the running stability of the corresponding air conditioning system is poor.

[0005] In order to solve the above problems, the present application provides a blower driving motor control system, which comprises a driving motor, and the stator winding of the driving motor has a U-phase input line, a U-phase output line, a V-phase input line, a V-phase output line, a W-phase input line and a W-phase output line. The U-phase output line, the V-phase output line and the W-phase output line are connected to a neutral point through a first relay to form a star connection mode of the blower. The U-phase output line and the V-phase input line, the V-phase output line and the W-phase input line, and the W-phase output line and the U-phase input line are respectively connected through a second relay to form a delta connection mode of the blower.

[0006] In some embodiments, the driving motor is a brushless direct current motor, and the blower driving motor control system further comprises a fan driver electrically connected to the U-phase lead-in wire, the V-phase lead-in wire and the W-phase lead-in wire.

[0007] The application further provides a blower driving motor control method for controlling the blower driving motor control system, comprising the following steps:

[0008] obtaining a power supply voltage Up of the battery;

[0009] when the power supply voltage Up is lower than a set voltage U, obtaining a running gear of the blower;

[0010] controlling one of the first relay and the second relay to be in a closed state and the other to be in an open state according to the level of the running gear.

[0011] In some embodiments, controlling one of the first relay and the second relay to be in a closed state and the other to be in an open state according to the level of the running gear specifically comprises:

[0012] when the running gear is the highest gear, controlling the first relay to be in an open state and the second relay to be in a closed state to make the blower in the delta connection mode;

[0013] otherwise, controlling the first relay to be in a closed state and the second relay to be in an open state to make the blower in the star connection mode.

[0014] In some embodiments,

[0015] when the power supply voltage Up is not lower than the set voltage U, controlling the first relay to be in a closed state and the second relay to be in an open state to make the blower in the star connection mode.

[0016] The application further provides an automobile air conditioning assembly comprising the blower driving motor control system.

[0017] In some embodiments, the blower is a centrifugal blower and comprises a volute, and a heat exchanger assembly is connected to an air inlet of the volute.

[0018] In some embodiments, when the fan driver is included, the fan driver is connected to the heat exchanger assembly.

[0019] In some embodiments, an airflow duct is formed in the volute, and an electric heater is arranged in the airflow duct.

[0020] In some embodiments, the volute has an air outlet, a damper is arranged on the air outlet, the damper is controlled by a damper actuator, and the damper actuator is arranged in the air flow channel.

[0021] The application provides a blower driving motor control system, a control method thereof and an automobile air conditioning assembly. The switching control of the first relay and the second relay realizes the switching of the connection relationship between the phase lead-in wires and the phase lead-out wires of the motor stator winding, and the blower can be controlled to operate in the delta connection mode when the supply voltage of the battery is lower than the set voltage and the blower operates in the high wind gear, i.e. the load of the blower is large, so as to ensure the stable operation of the blower at high speed, prevent the abnormal stop of the blower motor and ensure the stable operation of the air conditioning system. When the supply voltage of the battery is not lower than the set voltage, the blower is controlled to operate in the star connection mode, so as to ensure the high-speed and high-efficiency operation of the blower. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 is a schematic diagram of the principle of the blower driving motor control system of the embodiment of the application;

[0023] Figure 2 Fig. 2 is a control flow chart of the blower driving motor control method of another embodiment of the application;

[0024] Figure 3 Fig. 3 is a schematic diagram of the structure of the automobile air conditioning assembly of another embodiment of the application;

[0025] Figure 4 Fig. 4 is a schematic diagram of the driving connection between the driving motor and the centrifugal fan in Fig. 1. Figure 3

[0026] The reference signs are as follows:

[0027] 1, driving motor; 11, fan driver; 2, blower; 21, volute; 22, centrifugal fan blade; 23, motor support; 3, heat exchanger assembly; 4, electric heater; 5, damper actuator; 6, battery; U1, U-phase lead-in wire; U2, U-phase lead-out wire; V1, V-phase lead-in wire; V2, V-phase lead-out wire; W1, W-phase lead-in wire; W2, W-phase lead-out wire; KA1, first relay; KA2, second relay. DETAILED DESCRIPTION

[0028] For reference Figures 1 to 4 ​As shown, according to the embodiment of the present application, a blower driving motor control system is provided, which comprises a driving motor 1, a fan driver 11 arranged in cooperation with the driving motor 1, and a storage battery 6 capable of supplying power to the fan driver 11. The stator winding of the driving motor 1 has a U-phase input line U1, a U-phase output line U2, a V-phase input line V1, a V-phase output line V2, a W-phase input line W1, and a W-phase output line W2. The U-phase output line U2, the V-phase output line V2, and the W-phase output line W2 are controllably connected to a neutral point O through a first relay KA1 to form a star connection mode of a blower 2. The U-phase output line U2, the V-phase input line V1, the V-phase output line V2, the W-phase input line W1, and the W-phase output line W2 are controllably connected to each other through a second relay KA2 to form a delta connection mode of the blower 2. In the technical solution, the connection relationship between the input lines and the output lines of the motor stator winding is switched through the switching control of the first relay KA1 and the second relay KA2. Thus, when the supply voltage of the storage battery 6 is lower than a set voltage and the blower 2 runs at a high wind level, i.e., the load of the blower 2 is large, the blower 2 can be controlled to run in the delta connection mode, so as to ensure the stable running of the blower at a high speed and prevent the abnormal stop of the blower motor, and the air conditioning system runs more stably. When the supply voltage of the storage battery 6 is not lower than the set voltage, the blower 2 is controlled to run in the star connection mode, so as to ensure the high-speed and high-efficiency running of the blower. Figure 1 As shown, the first relay KA1 and the second relay KA2 can be triple relays.

[0029] In a preferred embodiment, the driving motor 1 is a brushless direct current motor. The brushless direct current motor has a fully-enclosed high-protection structure, can meet the water immersion requirement, can effectively prevent dust and water vapor from entering, and can improve the service life of the motor. Even if liquid such as rainwater splashes onto the motor, the motor can also work normally, so as to ensure that the vehicle interior space can be normally ventilated, and to provide a layer of safety guarantee for the safety of the driver and passengers. At this time, the fan driver 11 electrically connected to the U-phase input line U1, the V-phase input line V1, and the W-phase input line W1 has a corresponding inverter module, so as to convert the direct current output of the storage battery 6 into three-phase alternating current to supply the driving motor 1.

[0030] According to the embodiment of the present application, a blower driving motor control method is also provided, which is used for controlling the above-mentioned blower driving motor control system, and comprises the following steps:

[0031] obtaining the supply voltage Up of the storage battery;

[0032] When the supply voltage Up is lower than the set voltage U, the running gear of the blower 2 is acquired, specifically, the air gear of the blower 2 is provided with different speed points, the speed feedback is received through the fan driver 11, whether the air gear is given to the maximum can be judged, and whether the air gear is in the highest gear is the conventional technology in the industry, and the present application does not intend to protect the method of acquisition, which is not described here.

[0033] According to the height of the running gear, one of the first relay KA1 and the second relay KA2 is in the closed state, and the other is in the open state.

[0034] According to the height of the running gear, one of the first relay KA1 and the second relay KA2 is in the closed state, and the other is in the open state. Specifically, it comprises:

[0035] When the running gear is the highest gear, the first relay KA1 is controlled to be in the open state, and the second relay KA2 is controlled to be in the closed state to make the blower 2 in the delta connection mode, to ensure that the blower is in stable operation at high speed, and to prevent the blower motor from stopping abnormally, and the air conditioning system runs more stably; otherwise, the first relay KA1 is controlled to be in the closed state, and the second relay KA2 is controlled to be in the open state to make the blower 2 in the star connection mode, to ensure that the blower is in high-speed and high-efficiency operation.

[0036] Further, when the supply voltage Up is not lower than the set voltage U, the first relay KA1 is controlled to be in the closed state, and the second relay KA2 is controlled to be in the open state to make the blower 2 in the star connection mode, to ensure that the blower is in high-speed and high-efficiency operation.

[0037] According to the embodiment of the present application, an automobile air conditioning assembly is also provided, comprising the above-mentioned blower driving motor control system. Specifically, the blower 2 is a centrifugal fan and comprises a volute 21, the driving motor 1 is supported and fixed by a motor support 23, the centrifugal fan blade 22 of the centrifugal fan is sleeved on the output end of the rotating shaft of the driving motor 1, and is in the volute 21, and the air inlet of the volute 21 is connected with the heat exchanger assembly 3, so that the external air is first heated and then enters the volute 21. In the technical scheme, the heat exchanger assembly 3 is integrated and connected on the volute 21, so that the structure of the automobile air conditioning assembly is compact, the occupation of the internal space of the automobile can be reduced, and the space is saved. When the fan driver 11 is included, the fan driver 11 is connected to the heat exchanger assembly 3, and the structure design is reasonable.

[0038] The air flow channel is formed in the volute 21, and an electric heater 4 is arranged in the air flow channel to realize rapid heating in a low temperature environment. The volute 21 has an air outlet, and a damper is arranged on the air outlet. The damper is controlled by a damper actuator 5 arranged in the air flow channel. The size of the damper is controlled by the damper actuator 5, so as to automatically adjust the air outlet volume.

[0039] The principle on which the technical solution of the present application is based is further described below in combination with a specific embodiment:

[0040] The fan driver 11 can monitor the automobile power storage battery (i.e. the battery 6 in the foregoing, the same below) supply voltage Up. When the automobile power storage battery supply voltage Up is lower than a certain threshold (i.e. the set voltage U in the foregoing, the same below), and the air volume is set to the maximum, the relay KA2 is closed through the switch input point at this time, and the blower fan is selected to operate in the delta connection mode, so as to avoid the saturation of the actual operating voltage of the motor and the abnormal stop of the motor, reduce the failure probability of the air conditioner blower fan, and improve the working stability of the air conditioner blower fan.

[0041] The details are as follows:

[0042] As known, the model of the motor is

[0043] Wherein, Er is the back electromotive force of the motor, Rs, Ls and Lr are the equivalent resistance, inductance and resistance of the motor respectively, which are related to the motor body and can be considered as fixed values; Us is the voltage required by the motor during operation, ω is the rotating speed of the motor, and I is the current of the motor, which is related to the size of the load, and all of them are indefinite values.

[0044] The greater the power of the motor is, the greater the current I of the motor is; the higher the rotating speed is, the greater the value of ω is; the size of Us is related to the current I and the rotating speed ω of the motor, the higher the rotating speed of the motor is, the greater the current is, and the greater the value of Us is. Us is the voltage actually participating in the operation control of the motor, and for the power supply system, there is a given power supply voltage Up, to ensure the stable operation of the motor, Us<Up, that is, the effective voltage actually required by the motor cannot be greater than the direct current voltage of the system. For the automobile air conditioning system, since the power of the motor is greater when the motor operates at low temperature than when the motor operates at normal temperature, the load is larger, the current of the motor increases, and under the condition that other parameters do not change, the operating voltage Us of the motor increases with the increase of I, and when Us>Up, the motor will abnormally stop.

[0045] The control of the application is to add the judgment of the power storage battery Up in the fan driver 11, when the Up is lower than a certain threshold, the blower motor is actively switched to the delta connection mode, the blower back electromotive force is reduced, and the Us is less than the Up, so as to ensure the stable operation of the motor. When the Up is higher than a certain threshold, the blower motor is actively switched to the star connection mode, at this time the blower current is small, the motor copper consumption is reduced, and the efficiency of the motor is improved.

[0046] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0047] The above is only the preferred embodiment of the application, and should not be used to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application. The above is only the preferred embodiment of the application, and should not be used to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A blower drive motor control system, characterized in that, The drive motor (1) includes a stator winding with a U-phase lead-in (U1), a U-phase lead-out (U2), a V-phase lead-in (V1), a V-phase lead-out (V2), a W-phase lead-in (W1), and a W-phase lead-out (W2). The U-phase lead-out (U2), V-phase lead-out (V2), and W-phase lead-out (W2) are controllably connected to the neutral point (O) via a first relay (KA1) to form a star connection of the blower (2). The U-phase lead-out (U2) is connected to the V-phase lead-in (V1), the V-phase lead-out (V2) is connected to the W-phase lead-in (W1), and the W-phase lead-out (W2) is connected to the U-phase lead-in (U1). The first relay (KA1) and the second relay (KA2) are respectively connected to form a controllable connection to form a delta connection mode of the blower (2). When the power supply voltage Up of the battery is lower than the set voltage U and the operating gear of the blower (2) is the highest gear, the first relay (KA1) is in the open state and the second relay (KA2) is in the closed state so that the blower (2) is in the delta connection mode; when the power supply voltage Up of the battery is lower than the set voltage U and the operating gear of the blower (2) is not the highest gear, the first relay (KA1) is in the closed state and the second relay (KA2) is in the open state so that the blower (2) is in the star connection mode.

2. The blower drive motor control system according to claim 1, characterized in that, The drive motor (1) is a brushless DC motor, and the blower drive motor control system also includes a blower driver (11) electrically connected to the U-phase lead-in line (U1), V-phase lead-in line (V1), and W-phase lead-in line (W1).

3. A method for controlling a blower drive motor, characterized in that, The control system for controlling the blower drive motor as described in claim 1 or 2 includes the following steps: Obtain the battery's supply voltage Up; When the power supply voltage Up is lower than the set voltage U, the operating level of the blower (2) is obtained; Depending on the operating gear, one of the first relay (KA1) and the second relay (KA2) is controlled to be in a closed state and the other is in a closed state.

4. The blower drive motor control method according to claim 3, characterized in that, When the power supply voltage Up is not lower than the set voltage U, the first relay (KA1) is controlled to be closed and the second relay (KA2) is controlled to be open so that the blower (2) is in the star connection mode.

5. An automotive air conditioning assembly, characterized in that, Includes the blower drive motor control system as described in claim 1 or 2.

6. The automotive air conditioning assembly according to claim 5, characterized in that, The blower (2) is a centrifugal blower and includes a volute (21), the air inlet of which is connected to a heat exchanger assembly (3).

7. The automotive air conditioning assembly according to claim 6, characterized in that, When a fan driver (11) is included, the fan driver (11) is connected to the heat exchanger assembly (3).

8. The automotive air conditioning assembly according to claim 6, characterized in that, An airflow duct is formed inside the volute (21), and an electric heater (4) is installed inside the airflow duct.

9. The automotive air conditioning assembly according to claim 8, characterized in that, The volute (21) has an air outlet, and an air valve is provided on the air outlet. The air valve is controlled by an air valve actuator (5), which is located in the airflow duct.

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