JP4626237B2 - Multi-motor rotation speed switching control device - Google Patents

Description

  The present invention relates to a rotation speed switching control device for a plurality of motors.

  2. Description of the Related Art Conventionally, a vehicle having a capacitor having a plurality of fan motors as a rotation speed switching control device for a plurality of motors, wherein the plurality of fan motors are connected in series (low speed rotation state) and in parallel connection (high speed) to a power supply circuit. A rotation speed switching means for switching the rotation speeds of a plurality of fan motors by switching to a rotation state), and a protection circuit (fuse) that shuts off a power supply circuit when the fan motor is locked is known. (For example, refer to Patent Document 1).

JP 2004-104950 A

  However, in the above-described conventional technology, it is necessary to set the fuse capacity of the protection circuit based on a high motor current value (steady current value) when a plurality of fan motors are connected in parallel (high-speed rotation state). Therefore, there is a problem that the protection circuit cannot be operated if the fan motor is locked when the plurality of fan motors are switched to the serial connection state (low-speed rotation state).

  The present invention was made paying attention to the conventional problems as described above, and not only when a plurality of motors are connected in parallel (high-speed rotation state) but also in a series connection state (low-speed rotation state). Another object of the present invention is to provide a rotation speed switching control device for a plurality of motors that can protect a circuit by reliably operating a protection circuit.

In order to achieve the above-mentioned object, the rotational speed switching control device for a plurality of motors according to claim 1 of the present application is a system including a plurality of motors, wherein the plurality of motors are connected in parallel with a power supply circuit in a series connection state. In a rotational speed switching control device for a plurality of motors, comprising: rotational speed switching means for switching rotational speeds of a plurality of motors by switching to a connected state; and a protection circuit that shuts off the power supply circuit when the motor is locked. As the protection circuit , a fuse having a smaller capacity interposed in the power input lines of the plurality of motors in the serial connection state and a capacitor having a larger capacity interposed in the power input lines of the plurality of motors in the parallel connection state And the fuse with the smaller capacity or the fuse with the larger capacity provided in parallel. One of the fuse Fuse switching relay connected to said power supply circuit provided in's, the fuse capacitor switching in the protection circuit in conjunction with the switching instruction of the parallel connection state and the series connection state by the rotational speed changing unit The relay is configured to switch the fuse having the smaller capacity and the fuse having the larger capacity by a relay .

  The rotation speed switching control device for a plurality of motors according to claim 2 is the rotation speed switching control device for a plurality of motors according to claim 1, wherein the rotation speed switching means is in a state in which power to the plurality of motors is OFF. When the switching command to the serial connection state is issued, the switching to the larger-capacity fuse in the protection circuit is performed, and after the plurality of motors are first switched to the parallel connection state, the motor currents are paralleled. Switch to the serial connection state when the steady state current in the connected state is reached, and then switch to the smaller capacity fuse in the protection circuit when the motor current settles to the steady state current in the serial connection state. The means is characterized by being configured.

  The rotation speed switching control device for a plurality of motors according to claim 3 is the rotation speed switching control device for a plurality of motors according to claim 1, wherein the power supply to the plurality of motors is OFF or the rotation speed switching means. When switching to the parallel connection state is made in the rotational speed switching means from the state in which the switching to the serial connection state has been made, first, after switching to the larger capacity fuse in the protection circuit, The plurality of motors are configured to be switched to a parallel connection state after a predetermined time delay.

  According to a fourth aspect of the present invention, in the rotational speed switching control device for a plurality of motors according to the first aspect, the rotational speed switching control device for the plurality of motors is switched to a parallel connection state by the rotational speed switching means. When the switching command to the serial connection state is issued by the rotation speed switching circuit, the switch to the serial connection state is first performed, and then the predetermined time is delayed and the smaller one from the larger capacity fuse in the protection circuit The fuse is configured to be switched to a fuse.

In the multiple motor rotation speed switching control device according to claim 1, as described above, the protective circuit is connected in parallel to the smaller capacity fuse interposed in the power input line of the multiple motors in series connection. One of the smaller capacity fuse or the larger capacity fuse provided in parallel is provided in parallel with the larger capacity fuse interposed in the power input line of the multiple motors in the state. A fuse capacity switching relay for connecting one of the fuses to the power supply circuit is provided, and the fuse having the smaller capacity is connected by the fuse capacity switching relay in the protection circuit in conjunction with the switching command of the series connection state and the parallel connection state by the rotation speed switching means. by switching of the larger fuse capacity is configured to be performed with a plurality of Fanmo In addition to the parallel connection state (high-speed rotation state), the protection circuit can be operated reliably in the series connection state (low-speed rotation state), so that the circuit can be protected. .

  Further, in the rotational speed switching control device for a plurality of motors according to claim 2, as described above, when a command for switching from the power-off state to the plurality of motors to the serial connection state is made by the rotational speed switching means. The fuse is switched to the one with the larger capacity in the protection circuit, and the plurality of motors are first switched to the parallel connection state, and then the series connection state is established when the motor current settles to the steady current in the parallel connection state. When the motor current is settled to the steady current in the serial connection state, the switching to the fuse having the smaller capacity in the protection circuit is performed. Occurs when switching to parallel connection with the fuse with the larger capacity. Starting current while preventing cutting of the fuse by, it is possible to protect the circuit when the motor locks in the fuse having the smaller capacity after being switched to a series connection state.

  In addition, since the starting current when starting in a series connection state is protected by a large-capacity fuse, the lifetime of the fuse can be extended.

  Moreover, in the rotational speed switching control apparatus for a plurality of motors according to claim 3, as described above, the power supply to the plurality of motors is in the off state or the state in which the rotational speed switching means is switched to the serial connection state. When the switching speed is switched to the parallel connection state by the rotation speed switching means, first, the protection circuit is switched to the larger capacity fuse, and then a plurality of motors are switched to the parallel connection state with a delay of a predetermined time. With this configuration, even if there is a variation in the switching operation time of relays, etc., switching to the fuse with the larger capacity can be surely preceded by switching to the parallel connection state. It becomes possible to prevent the fuse from being blown by current.

  Further, in the rotational speed switching control device for a plurality of motors according to claim 4, as described above, a state in which the rotational speed switching means is switched to the parallel connection state from the state in which the rotational speed switching means is connected in series with the rotational speed switching means. When the switch command is issued, the switch is first switched to the serial connection state, and then the switch is made to switch from the larger capacity fuse to the smaller capacity fuse in the protection circuit after a predetermined time delay. Therefore, even if there is a variation in the switching operation time in the relay, etc., switching to the series connection state can be surely preceded by switching to the fuse having the smaller capacity. This makes it possible to prevent the fuse from being blown.

  Embodiments of the present invention will be described below with reference to the drawings.

The rotational speed switching control device for a plurality of motors of this embodiment corresponds to the inventions described in claims 1 to 4. In this embodiment, a case where the present invention is applied to a condenser for cooling the refrigerant of an air conditioner installed in a diesel vehicle having a battery power supply voltage of 24 V equipped with two fan motors will be described as an example.
FIG. 1 is a control circuit diagram showing a rotation speed switching control device for a plurality of motors according to an embodiment applied to a condenser for cooling a refrigerant of an air conditioner installed in a diesel vehicle, and FIGS. It is a time chart which shows the control action of a speed change control device.

As shown in FIG. 1, the multi-motor rotational speed switching control device of this embodiment includes a solenoid 1 for intermittently connecting a pulley to transmit engine rotation to the compressor to turn on / off the operation of the compressor, and a solenoid the ON · OFF relay 2, the first fan motor 3, and a second fan motor 4, a large-capacity fuse 5,5 of both the fan motor 3, for 4, small capacity fuses for both fan motors 3 and 4 6, serial / parallel switching relays 7 and 7, fan motor ON / OFF switching relay 8, fuse capacity switching relay 9, controller 10, controller fuse 11, solenoid fuse 12, and relay fuse 13, a refrigerant intermediate pressure switch 14, and an ECM (engine control computer) 15 are provided as main components.

More specifically, the solenoid 1 is switched on and off by a solenoid ON / OFF relay 2 that operates in response to a command signal from the ECM 15.
The first fan motor 3 and the second fan motor 4 are connected to a power circuit (battery circuit) by serial / parallel switching relays 7 and 7 that are operated by a command signal from a controller 10 constituting a rotation speed switching means. In other words, the circuit configuration can be switched between a series connection state (series Lo) and a parallel connection state (parallel Hi).

  Further, the first fan motor 3 and the second fan motor 4 are interposed in a power input line from the power circuit (battery circuit) and are operated by a command signal from the controller 10. The OFF switching relay 8 switches ON / OFF the input power from the power circuit (battery circuit).

Further, with the fan motor 3, the large-capacity fuse 5,5 for 4, small capacity fuses 6 for a fan motor 3 and 4, constitutes a protection circuit for interrupting the power supply circuit when the lock of the fan motor 3 and 4 It is interposed in parallel with a power input line from a power circuit (battery circuit), and either one of the large capacity fuses 5 and 5 or the small capacity fuse 6 is powered by the fuse capacity switching relay 9. It is connected to the circuit.

The large-capacity fuses 5 and 5 or the small-capacity fuse 6 are switched by a fuse capacity switching relay 9 that operates in conjunction with a switching command between the series connection state and the parallel connection state in the controller 10. .
Table 1 shows the values of the starting current, the binding current, and the steady current when the fan motors 3 and 4 are connected in series (Lo) and in the parallel connection (Hi).

Next, functions and effects of the embodiment will be described.
First, the control operation of the controller 10 in the rotational speed switching control apparatus for a plurality of motors of this embodiment will be described based on the time charts of FIGS.

[OFF → series connection state]-See Fig. 2 When the fan motor is switched off, the fuse capacity switching relay is switched off when the power input to the relay coil of the fan motor ON / OFF switching relay 8 is off. The power input to the relay coil 9 is cut off and switched to the small capacity fuse 6 side. Moreover, the power supply input to the relay coils of the series / parallel switching relays 7 and 7 is cut, whereby the first fan motor 3 and the second fan motor 4 are connected in series.

  When the controller 10 is instructed to switch to the serial connection state from this state, first, the power source input to the relay coil of the fuse capacity switching relay 9 is turned on to switch to the large capacity fuses 5 and 5 side. After that, the power supply to the relay coil of the fan motor ON / OFF switching relay 8 is switched on in parallel with the power input to the relay coil of the direct / parallel switching relays 7 and 7 being delayed for a predetermined time. When the input is turned ON, a large starting current (28 to 30 A) flows as the motor current, and both the motors 3 and 4 rotate (high-speed rotation).

  After that, when the motor current settles to the steady current (8 to 9 A) in the parallel connection state, the power supply input to the relay coils of the direct / parallel switching relays 7 and 7 is turned off to switch to the serial connection state. After that, when the motor current settles to the steady current (3 to 4 A) in the serial connection state, the power input to the relay coil of the fuse capacity switching relay 9 is turned OFF, so that the switching to the small capacity fuse 6 side is performed. Made.

[OFF → Parallel connection state]-See FIG. 3 Next, when the controller 10 is instructed to switch from the power input OFF state in which the fan motor ON / OFF switching relay 8 opens the power circuit to the parallel connection state. First, when the power input to the relay coil of the fuse capacity switching relay 9 is turned ON, the switching to the large capacity fuses 5 and 5 side is performed, and then the relays for the direct / parallel switching relays 7 and 7 are delayed for a predetermined time. With the power input to the coil turned ON and switched to the parallel connection state, the power input to the relay coil of the fan motor ON / OFF switching relay 8 is turned ON, so that a large starting current (28 to 30 A) as the motor current Flows and both fan motors 3 and 4 rotate (high-speed rotation).

[Series connection state → Parallel connection state → OFF]... Refer to FIG. 4 Next, the series connection state which is the final stage of FIG. 2 (in this state, the power input to the relay coil of the fan motor ON / OFF switching relay 8 is When the controller 10 is instructed to switch to the parallel connection state, first, the power input to the relay coil of the fuse capacity switching relay 9 is turned on, so that the large capacity fuses 5, 5 After switching to the side, the power input to the relay coil of the direct / parallel switching relays 7 and 7 is turned on by delaying for a predetermined time to switch to the parallel connection state, and both fan motors 3 and 4 rotate ( Rotate at high speed).

  When the switching of the fan motor is switched to OFF from this state, the power input to the relay coil of the fan motor ON / OFF switching relay 8 is switched to the OFF state, and then delayed for a predetermined time, and the fuse capacity switching relay 9 is switched. Switching to the small-capacity fuse 6 side is performed by turning off the power input to the relay coil.

[Parallel connection state → series connection state → OFF]... Refer to FIG. 5 Next, the parallel connection state which is the final stage of FIG. 3 (in this state, the power input to the relay coil of the fan motor ON / OFF switching relay 8 is When the controller 10 is instructed to switch to the serial connection state, the power input to the relay coils of the series / parallel switching relays 7 and 7 is first turned OFF so that the serial connection state is established. After switching, the power input to the relay coil of the fuse capacity switching relay 9 is turned OFF with a delay of a predetermined time, whereby switching to the small capacity fuse 6 side is performed.

  When the switching of the fan motor is switched to OFF from this state, the power input to the relay coil of the fan motor ON / OFF switching relay 8 is switched to the OFF state, so that both fan motors 3 and 4 are rotated. Stop.

  As described above in detail, according to the rotation speed switching control device for a plurality of motors of this embodiment, two types of fuses, that is, large capacity fuses 5 and 5 and small capacity fuses 6 having different capacities can be switched as a protection circuit. The large-capacity fuses 5 and 5 and the small-capacity fuses 6 having different capacities in the protection circuit are switched in conjunction with a switching instruction between the serial connection state and the parallel connection state by the controller 10. This ensures that the protection circuit operates and protects the circuit not only when the two fan motors 3 and 4 are connected in parallel (high-speed rotation state) but also in a series connection (low-speed rotation state). The effect of being able to do is obtained.

In addition, when the controller 10 issues a command for switching from the power-off state to the two fan motors 3 and 4 to the serial connection state, the switching to the larger capacity fuses 5 and 5 in the protection circuit is performed. In addition, after the two fan motors 3 and 4 are first switched to the parallel connection state, the motor current is switched to the serial connection state when the motor current settles to the steady current in the parallel connection state, and then the motor current is connected in series. By switching to the smaller capacity small capacity fuse 6 in the protection circuit when the steady current in the state is settled, first, the fan motors 3 and 4 are reliably rotated in the parallel connection state. Can occur at the time of switching to the parallel connection state with the large capacity fuses 5 and 5 having the larger capacity. While preventing cutting of the fuse according to the current, so that the after switching to the series connection state it is possible to protect the circuit when the fan motor is locked in small capacity fuses 6 having the smaller capacity.
Further, since the starting current when starting in the series connection state is protected by the large-capacity fuses 5 and 5 having large capacities, the lifetime of the fuses can be extended.

  When the controller 10 is instructed to switch to the parallel connection state from the state in which the power supply to the two fan motors 3 and 4 is OFF or the controller 10 is switched to the serial connection state, first, a protection circuit is provided. After switching to the larger-capacity fuses 5 and 5 in the circuit, the two fan motors 3 and 4 are configured to be switched to a parallel connection state with a predetermined time delay. , 8, 9) Even if the switching operation time varies, switching to the larger capacity fuses 5 and 5 with higher capacity can be reliably preceded by switching to the parallel connection state. It becomes possible to prevent the fuse from being blown by current.

When the controller 10 is instructed to switch to the serial connection state from the state in which the controller 10 is switched to the parallel connection state, the protection circuit is first delayed for a predetermined time after the switch to the serial connection state is made. by switching to the high-capacity fuses 5, five et smaller small-capacity fuse 6 having a larger capacity is configured as is done in, a variation in the switching operation time of the relay (7, 8, 9) Even in such a case, switching to the serial connection state can be surely preceded by switching to the smaller-capacity fuse 6 having a smaller capacity, thereby preventing the fuse from being blown by a steady current in the parallel connection state. become able to.

As described above, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and the present invention can be applied even if there are design changes and the like without departing from the scope of the present invention. included.
For example, in the embodiment, an example in which the present invention is applied to a condenser of a vehicle air conditioner including two fan motors 3 and 4 is shown. The present invention can be applied to all systems including a plurality of motors such as motors other than the condenser fan motor.

It is a control circuit diagram which shows the rotational speed switching control apparatus of the several motor of the Example with which the fan motor provided in the capacitor | condenser of the diesel vehicle air conditioner was applied. It is a time chart which shows the control action of the rotational speed switching control apparatus of the multiple motor of an Example. It is a time chart which shows the control action of the rotational speed switching control apparatus of the multiple motor of an Example. It is a time chart which shows the control action of the rotational speed switching control apparatus of the multiple motor of an Example. It is a time chart which shows the control action of the rotational speed switching control apparatus of the multiple motor of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid 2 Solenoid ON / OFF relay 3 1st fan motor 4 2nd fan motor 5 Large capacity fuse 6 Small capacity fuse 7 Direct / parallel switching relay 8 Fan motor ON / OFF switching relay 9 Fuse capacity switching relay 10 Controller (Rotation speed switching means)
11 Fuse for controller 12 Fuse for solenoid 13 Fuse for relay 14 Refrigerant medium pressure switch 15 ECM

Claims (4)

A rotation speed switching means for switching the rotation speeds of a plurality of motors by switching the plurality of motors to a power supply circuit between a series connection state and a parallel connection state; In a rotation speed switching control device for a plurality of motors provided with a protection circuit that shuts off the power supply circuit when locked,
As the protection circuit , a fuse having a smaller capacity interposed in the power input lines of the plurality of motors in the serial connection state and a capacitor having a larger capacity interposed in the power input lines of the plurality of motors in the parallel connection state. And a fuse capacity switching relay for connecting one of the smaller capacity fuse and the larger capacity fuse provided in parallel to the power supply circuit. The fuse having the smaller capacity and the fuse having the larger capacity are switched by the fuse capacity switching relay in the protection circuit in conjunction with the switching command of the serial connection state and the parallel connection state by the rotation speed switching means. And a rotational speed switching control device for a plurality of motors.   2. The rotational speed switching control device for a plurality of motors according to claim 1, wherein when the power supply for the plurality of motors is instructed to be switched to a serial connection state by the rotational speed switching means, the capacity in the protection circuit is set. Is switched to the larger fuse, and the plurality of motors are first switched to the parallel connection state, and then switched to the series connection state when the motor current settles to the steady current in the parallel connection state. A rotational speed switching control device for a plurality of motors, wherein the switching is made to a fuse having a smaller capacity in the protection circuit when the motor current settles to a steady current in a series connection state.   2. The rotational speed switching control device for a plurality of motors according to claim 1, wherein the rotational speed switching means from a state in which power to the plurality of motors is OFF or a state in which the rotational speed switching means is switched to a serial connection state. When the switching command to the parallel connection state is issued, the switching to the larger-capacity fuse in the protection circuit is first performed, and then the plurality of motors are switched to the parallel connection state after a predetermined time delay. A rotational speed switching control device for a plurality of motors.   2. The rotational speed switching control device for a plurality of motors according to claim 1, wherein a switching command from a state in which the rotational speed switching means is switched to a parallel connection state to a serial connection state is made by the rotational speed switching circuit. In this case, first, after switching to the serial connection state, it is configured to switch from the larger capacity fuse to the smaller capacity fuse in the protection circuit after a predetermined time delay. A rotation speed switching control device for a plurality of motors.

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