JP2013147986A - Pump control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump control system coping with a failure of a power supply system while increasing redundancy by providing a plurality of electric pumps to a fluid passage.SOLUTION: A pump control system includes a first electric pump P1 and a second electric pump P2 provided to a fluid passage R, first and second rotation speed sensors RS1, RS2 measuring rotation speeds of the first and second electric pumps P1, P2, and first and second voltage sensors VS1, VS2 measuring voltages of electric power supplied to the first and second electric pumps P1, P2, and includes a pump control device 10 which stops the supply of the electric power to the electric pump P in which abnormal conditions are determined when the abnormal conditions of one of the first electric pump P1 and the second electric pump P2 are determined on the basis of measurement results of the sensors, and which lights a yellow lamp 11 and stores history information.

Description

  The present invention relates to a pump control system, and more particularly to a technique for controlling a plurality of electric pumps that send fluid to a fluid path.

  As a control system for an electric pump configured as described above, Patent Document 1 discloses a cooling jacket to which a liquid refrigerant for cooling a semiconductor is supplied, a radiator for radiating the heat of the liquid refrigerant, and circulating the liquid refrigerant. A liquid cooling system with two circulation pumps is shown. In Patent Document 1, two circulation pumps are connected in series, and a bypass tube is provided in a position parallel to the two circulation pumps. Even when one circulation pump stops due to a failure or the like, The liquid refrigerant is circulated by sending the liquid refrigerant.

  In this Patent Document 1, a sensor for measuring the rotation of two circulation pumps is provided, and when it is determined that one of the circulation pumps has failed, the rotation speed of the other circulation pump is increased and A control form for turning on an alarm lamp indicating that there is a certain state is shown.

  Patent Document 2 discloses an electronic liquid cooling system including a plurality of pump assemblies that connect a heat exchanger and a cooling plate to a liquid cooling loop pipe, and a controller that controls the plurality of pump assemblies. In this patent document 1, a plurality of pump assemblies are configured by connecting a plurality of pumps at least one more than the minimum number satisfying the use of the system. The controller controls the pump according to the load.

  In this patent document, the controller accesses sensors for measuring the state of individual pumps including the temperature of electronic components, the flow rate of piping, and the pumping rate. In the non-operation mode, the redundant pump is not operated and the failure state is predicted or A control configuration for detecting and operating the redundant pump in the non-operating state is shown.

JP 2005-228237 A JP 2005-315255 A

  Using a plurality of electric pumps to supply fluid to the fluid flow path is effective in terms of increasing redundancy. However, for example, assuming a configuration in which a plurality of electric pumps are controlled by a single power control board, if the power control board fails, the plurality of electric pumps cannot be operated simultaneously, and redundancy cannot be utilized. Connected.

  Considering the configurations of Patent Literature 1 and Patent Literature 2, it cannot be said that the failure of the power control system is taken into account. Moreover, in the configuration of Patent Literature 2, the number of electric pumps increases, so the number of parts increases and the cost increases. There is room for improvement.

  An object of the present invention is to rationally configure a pump control system that can cope with a failure of a power supply system while increasing redundancy by providing a plurality of electric pumps.

  A feature of the present invention is that a plurality of electric pumps that send fluid to a common fluid path, a power supply unit that supplies power to each of the electric pumps independently, and the rotational speeds of the plurality of electric pumps are individually measured. And a measurement sensor that individually measures a current value or a voltage value of power supplied to the electric pump at each power supply unit, and a measurement result of the rotation speed sensor and the measurement sensor And a pump control device that controls power supplied from the power supply unit to the plurality of electric pumps based on the determination.

According to this configuration, when the voltage pump control device determines the abnormality of the electric pump based on the measured value from either the rotation speed sensor or the measurement sensor, the plurality of electric pumps are individually determined based on the determination. The power supply unit that supplies power is controlled. Thereby, the control corresponding to the abnormality becomes possible. In addition, since a number of power control units corresponding to a plurality of electric pumps are provided, a plurality of power supply systems in the case where the power supply system fails compared to a configuration in which a plurality of electric pumps are controlled by one power control board or the like. There is no inconvenience that the electric pump becomes inoperable at the same time.
Therefore, a pump control system that can cope with failure of the power supply system while increasing redundancy by providing a plurality of electric pumps has been constructed.

  In the present invention, when the pump control device measures an abnormal value with the rotation speed sensor, or when the pump sensor measures an abnormal value with the measurement sensor, power supply to the electric pump in which the abnormal value is measured is stopped. In addition to performing power cutoff control, storage control may be performed in which information that can identify the electric pump that has stopped supplying power is stored in a storage unit.

  According to this, when an abnormal value is measured, the pump control device performs control to stop power supply to the electric pump, so that power is not wasted. In addition, the storage control for storing the information specifying the electric pump whose power supply has been stopped in the storage unit makes it easy to perform maintenance or replace the electric pump.

  In the present invention, when the pump control device cuts off the electric power supplied to the electric pump by the electric power cut-off control, the speed increase control for increasing the rotation speed of the other electric pump may be performed. .

  According to this, when the pump control device stops the power supply to the electric pump by the power cutoff control, the rotational speed of the other electric pump is increased by the speed increasing control, and the flow rate of the fluid sent to the fluid path is reduced. Reduction can be suppressed.

  In the present invention, the fluid path is configured to be a circulation type in which a fluid heated by a heat source is sent to a radiator and the fluid radiated by the radiator is returned to the heat source, and the temperature of the fluid sent to the fluid path is set. A temperature sensor for measuring is provided, and the pump control device performs temperature control for increasing at least one rotational speed of the plurality of electric pumps when a temperature measured by the temperature sensor exceeds a set value. May be.

  According to this, when the temperature measured by the temperature sensor exceeds the set value, the pump control device increases the rotation speed of the electric pump by temperature control, thereby increasing the temperature of the fluid sent to the fluid path. Suppress.

  In the present invention, the pump control device measures an abnormal value with the rotation sensor when the temperature measured by the temperature sensor is less than the set value, or measures an abnormal value with the measurement sensor. In this case, the first alarm information is output, and when the temperature measured by the temperature sensor exceeds the set value, the second alarm information indicating that the situation is more severe than the first alarm information is output. You may do it.

  According to this, when the first alarm information is output, the operator is in a situation where an abnormality occurs in at least one of the plurality of electric pumps, and the temperature of the fluid sent to the fluid path is maintained below the set value. Can be judged. On the other hand, when the second alarm information is output, the operator can determine that quick action is necessary because the temperature of the fluid has increased excessively.

  The present invention may include a fuse that blows when a current exceeding a set current flows in a power path that supplies power from a power source to the plurality of power supply units.

  According to this, for example, in the situation where an electric motor fails and an excessive current exceeding the set current flows from the power path to the power supply unit, the fuse is blown to protect the power path and the power supply unit. Done.

  In the present invention, a plurality of the electric pumps may be arranged in series with respect to the fluid path.

  According to this, it becomes possible to send the fluid to the fluid path in a state where the pressure is easily increased by pressurizing the fluid by each of the plurality of electric pumps.

It is a whole block diagram of a pump control system. It is a block circuit diagram of a control system. It is a flowchart of a pump control routine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
〔System configuration〕
As shown in FIG. 1, cooling water (an example of a fluid) of a water jacket 1 (an example of a heat source) of an engine E provided in a vehicle such as a passenger car is sent to a radiator 2 (an example of a radiator), and water is discharged after heat dissipation. A circulation type fluid path R returning to the jacket 1 is configured, and a pump control system includes a plurality of electric pumps P for circulating cooling water and a pump control device 10 for independently controlling the plurality of electric pumps P. It is configured.

  The fluid path R includes a supply pipe 3 that sends out cooling water from the water jacket 1 and a reduction pipe 4 that returns the cooling water radiated by the radiator 2 to the water jacket of the engine. A temperature sensor TS for measuring temperature is provided. Further, as the plurality of electric pumps P, a first electric pump P1 and a second electric pump P2 are arranged in series along the flow direction of the cooling water in the fluid path R in the reduction pipe 4.

  The 1st electric pump P1 is comprised by the centrifugal pump type | mold which has the 1st motor M1 which consists of a brushless DC motor, and the 1st rotary blade W1 (impeller). Similarly, the second electric pump P2 includes a second motor M2 formed of a brushless DC motor and a second rotary blade W2.

  In this pump control system, a power supply unit 14 that independently controls the first and second motors M1 and M2 of the first and second electric pumps P1 and P2, and a power supply 15 for each power supply unit 14 And an electric power line 16 for supplying the electric power. The first motor M1 includes a first rotation speed sensor RS1 that measures the rotation speed, and the second motor M2 includes a second rotation speed sensor RS2 that measures the rotation speed. A power supply system that supplies power from the corresponding power supply unit 14 to the first and second motors M <b> 1 and M <b> 2 is also referred to as a power line 16.

  In the power line 16 that controls the power supplied to the first motor M1, a first voltage sensor VS1 (an example of a measurement sensor) that measures a voltage, a first relay RY1 (an example of a measurement sensor) that performs intermittent power, A fuse 18 that blows when a current exceeding the set current flows is provided. Similarly, the power line 16 that controls the power to supply power to the second motor M2 has a second voltage sensor VS2 that measures the voltage, a second relay RY2 that performs intermittent power, and the set current has exceeded. A fuse 18 is provided that blows when a current flows. The first and second voltage sensors VS1 and VS2 may be configured to measure the voltage of the power line 16 sharing power from the power supply unit 14 to the corresponding first and second motors M1 and M2. .

  The power source 15 described above is configured by a battery provided in the vehicle, and the power supply unit 14 is configured as a controller that controls the rotation speed of the rotor by adjusting the power supplied to the field coil of the motor. Is done. The power supply unit 14 has a built-in power adjustment unit (not shown) that adjusts the power supplied to the electric pump P by setting the duty ratio, and adjusts the rotation speed according to the power value by the power adjustment unit. .

  The pump control device 10 is configured as an ECU by using a microprocessor or a DSP, and includes a history information storage unit (not shown) configured by a nonvolatile memory such as an EEPROM. As shown in FIGS. 1 and 2, the pump control apparatus 10 includes a measurement signal from the temperature sensor TS, measurement signals from the first and second rotation speed sensors RS1 and RS2, and first and second voltage sensors VS1 and VS2. The measurement signal from the measurement signal is acquired. Further, the pump control device 10 independently outputs a control signal for controlling the rotation speeds of the first and second motors M1 and M2 to the two power supply units 14, and the first and second relays RY1, A control signal for controlling RY2 is output, and the yellow lamp 11 and the red lamp 12 provided in the driving unit of the vehicle are selected and turned on. The yellow lamp 11 is an example of an output unit that outputs first alarm information, and the red lamp 12 is an example of an output unit that outputs second alarm information indicating that the situation is more severe than the first alarm information.

  In particular, when the electric pump P includes a rotation angle sensor such as a Hall element that feeds back the rotation angle of the rotor, the control mode may be set so as to detect the rotation speed from the detection signal of the rotation angle sensor. . In the case of no rotation angle sensor, the rotation speed may be detected by the cycle and frequency of the zero cross point.

[Control form]
In the pump control system of the present invention, the pump control device 10 controls the operating speeds of the first and second electric pumps P1, P2 so that the temperature of the cooling water measured by the temperature sensor TS is maintained below the set value. I do. Further, when it is determined that one operating speed of the first and second electric pumps P1 and P2 is an abnormal value, or one of the first and second rotational speed sensors RS1 and RS2 is an abnormal value. If it is determined that the power is cut off, power cutoff control is performed to stop the power supply to the electric pump P having an abnormal value. By performing this control, the pump control device 10 realizes redundant control. The outline of this control will be described based on the flowchart of FIG.

  At the start of control, initialization (# 101 step) is performed, and a temperature control routine for controlling the rotation speed (the number of rotations within a unit time) of the electric pump P based on the measured value of the temperature sensor TS is executed (# 102 to # 107). Step). Next, an abnormality of the electric pump P is determined based on the measured values of the first and second voltage sensors VS1, VS2, and a voltage control routine for controlling the electric pump P that has determined the abnormality is executed (# 108-). Step # 112). Next, an abnormality of the electric pump P is determined based on the measured values of the first and second rotation speed sensors RS1 and RS2, and a rotation speed control routine for stopping the electric pump P that has determined the abnormality is executed (#). 113- # 117 steps). These controls are repeated until reset (step # 118).

  The above-described initialization includes control information for setting initial power values to be supplied to the first and second motors M1 and M2 when the operation of the electric pump P is started. Based on this control information, two electric powers are set. Electric power is supplied from the supply unit 14 to the corresponding motors (first and second motors M1 and M2).

  If it is determined in the temperature control routine that the measured value of the temperature sensor TS is appropriate, the routine proceeds to the next routine. On the other hand, when it is determined that the measured value of the temperature sensor TS is not appropriate, if the measured value is a measured value lower than the target temperature, the driving force of the electric pump P is reduced (Down). (Steps # 103 and # 104). When it is determined that the measured value of the temperature sensor TS is higher than the target temperature, the driving force of the electric pump P is increased (Up) (step # 105). Further, if the measured value of the temperature sensor TS does not decrease even when the driving force is increased, an abnormality history including the date and time when the abnormality is determined, the measured temperature, and the like is generated and stored in the history information storage unit Control is performed to turn on the red lamp 12 as an alarm output (steps # 106 and # 107).

  In the voltage control routine, when it is determined that the voltage values measured by the first and second voltage sensors VS1 and VS2 are both appropriate, the process proceeds to the next routine. On the other hand, when it is determined that the voltage value supplied to the first motor M1 among the voltage values measured by the first and second voltage sensors VS1 and VS2 is an abnormal value, the first relay RY1. Is turned off (power cutoff control), and speed-up control is performed to increase (Up) the driving force (rotational speed) of the second motor M2 (steps # 109 and # 110). Further, when it is determined from the voltage values measured by the first and second voltage sensors VS1 and VS2 that the voltage value supplied to the second motor M2 is an abnormal value, the second relay RY2 is turned off (off). (Power cut-off control), and speed increase control for increasing (Up) the driving force (rotational speed) of the first motor M1 is performed (step # 111). When an abnormality is determined in this way, the storage control is performed to generate an abnormality history that can specify the date and time when the abnormality is determined and the electric pump P that has stopped power supply, and store the abnormality history in the history information storage unit. Control is performed to turn on the yellow lamp 11 as an output (step # 112).

  In this voltage control routine, the abnormality is determined by comparing the voltage value measured by the first voltage sensor VS1 with the voltage value measured by the second voltage sensor VS2 and the set voltage. The processing mode may be set so that the voltage values of the two voltage sensors VS1 and VS2 are compared, and it is determined that the abnormality is detected when the difference between the voltage values exceeds a set value.

  In the rotational speed determination routine, when both the rotational speeds (the rotational speeds within the unit time) measured by the first and second rotational speed sensors RS1 and RS2 are appropriate, the routine proceeds to the next routine. On the other hand, when it is determined that the first motor M1 is abnormal from the rotational speeds measured by the first and second rotational speed sensors RS1, RS2, the first relay RY1 is turned off. Speed increase control is performed to increase (Up) the driving force (rotational speed) of the second motor M2 (steps # 114 and # 115). Further, when it is determined that the second motor M2 is abnormal from the rotation speeds measured by the first and second rotation speed sensors RS1 and RS2, the second relay RY2 is turned off and the first motor Speed increase control is performed to increase (Up) the driving force (rotational speed) of M1 (step # 116). When abnormality is determined in this way, an abnormality history that can specify the date and time when the abnormality is determined or the electric pump P that has stopped supplying power is generated and written in the history information storage unit, and the yellow lamp 11 is output as an alarm output. Is controlled (step # 117).

  In this rotation speed determination routine, the rotation speed measured within the unit time by the first rotation speed sensor RS1 is compared with the rotation speed measured within the unit time by the second rotation speed sensor RS2, and one of the rotation speeds is compared. On the other hand, when the other rotational speed is a low numerical value exceeding the set value, it is determined to be abnormal. As a different determination mode, the rotation speed for the power value set by the power supply unit 14 is stored in advance as table information or the like, and an abnormality is determined based on the difference between the measured rotation speed and the table value. May be.

  In this pump control system, when the first and second motors M1 and M2 and the power supply unit 14 break down and an excessive current flows in the power line 16, the fuse 18 is blown, so that the power line 16 It is also configured so that the power supply to can be stopped quickly.

[Effect of the embodiment]
As described above, the pump control system of the present invention includes two electric pumps P (first and second electric pumps P1 and P2) in the fluid path, so that when an abnormality occurs in one electric pump P, the other The cooling water can be circulated also by the operation of the electric pump P, and control for increasing redundancy is realized. In particular, since the electric pump P is a centrifugal pump type and can circulate the cooling water even in a non-operating state, the cooling water can be circulated by the other electric pump P without difficulty even if the operation of one electric pump P is stopped. .

  Further, in this pump control system, the temperature of the cooling water is set to the target value by simultaneously controlling the driving force of the two electric pumps P (first and second electric pumps P1, P2) based on the measured value of the temperature sensor TS. Maintained. With this control as well, when the temperature of the cooling water exceeds the set temperature, it is possible to clearly notify the driver that the red lamp 12 is lit to cause overheating. When one electric pump P is in a stopped state, the driving force of the other electric pump P is controlled.

  In this pump control system, the abnormality of the motor constituting the electric pump P is determined based on the rotational speed of the rotor and the voltage, so that highly accurate determination is realized. Since the supply of electric power is stopped by the control of the second relays RY1 and RY2, wasteful consumption of electric power is suppressed. And when supply of the electric power to one electric pump P is stopped, the fall of the circulating amount of cooling water is suppressed by increasing the electric power supplied to the other electric pump P.

  In particular, when the two electric pumps P (first and second electric pumps P1, P2) are stopped, the driver recognizes that one of the electric pumps P is in a failure state by turning on the yellow lamp 11. The status of failure can be grasped from history information.

[Another embodiment]
The present invention may be configured as follows in addition to the embodiment described above.

(A) Three or more electric pumps P for feeding fluid may be provided. When three or more electric pumps P are provided as described above, all or some of the electric pumps P may be provided in parallel with the fluid path R.

(B) The electric pump P may have a configuration other than the centrifugal type, and the fluid may be a heat medium or oil other than the cooling water.

(C) As a measurement sensor for measuring the current value flowing through the motors of the plurality of electric pumps P, for example, a power system flowing from the motor coil to the ground side is provided with a shunt resistor, and the current value is converted into a voltage value by the shunt resistor. The current sensor may be configured so as to be acquired, and the state of the electric pump P may be determined from the current value measured by the current sensor. Moreover, you may set the determination form so that the state of an electric motor may be determined based on the measured value of the voltage sensor described in embodiment, and a current sensor.

  INDUSTRIAL APPLICABILITY The present invention can be used in a pump control system that improves redundancy by providing a plurality of electric pumps in a fluid path.

1 Heat source (water jacket)
2 radiator (radiator)
DESCRIPTION OF SYMBOLS 10 Pump control apparatus 14 Electric power supply part 15 Power supply 18 Fuse P Electric pump R Fluid path | route RS1 Rotational speed sensor (1st rotational speed sensor)
RS2 rotation speed sensor (second rotation speed sensor)
TS Temperature sensor VS1 Measurement sensor (first voltage sensor)
VS2 measurement sensor (second voltage sensor)

Claims (7)

A plurality of electric pumps for sending fluid to a common fluid path, a power supply unit for independently supplying electric power to each of the electric pumps, a rotation speed sensor for individually measuring the rotation speeds of the plurality of electric pumps, A measurement sensor that individually measures the current value or voltage value of the power supplied to the electric pump in each power supply unit;
Pump control that determines abnormality of the electric pump based on measurement results of the rotation speed sensor and the measurement sensor, and controls electric power supplied from the power supply unit to the plurality of electric pumps based on the determination Pump control system with equipment.   When the pump control device measures an abnormal value with the rotation speed sensor or when the measurement sensor measures an abnormal value, the power cutoff control stops power supply to the electric pump in which the abnormal value is measured. 2. The pump control system according to claim 1, wherein the storage control is performed such that information capable of specifying the electric pump whose power supply has been stopped is stored in a storage unit.   3. The pump control according to claim 2, wherein the pump control device performs speed increase control for increasing the rotation speed of the other electric pump when the power supplied to the electric pump is cut off by the power cut-off control. system. The fluid path is configured to be a circulation type that sends the fluid heated by the heat source to the radiator and returns the fluid radiated by the radiator to the heat source, and measures the temperature of the fluid sent to the fluid path. Is provided,
The pump control device according to any one of claims 1 to 3, wherein the pump control device performs temperature control for increasing at least one rotational speed of the plurality of electric pumps when a temperature measured by the temperature sensor exceeds a set value. The pump control system according to one item.   When the pump control device measures an abnormal value with the rotation speed sensor in a situation where the temperature measured by the temperature sensor is less than the set value, or when the abnormal value is measured by the measurement sensor, 5. The first alarm information is output, and when the temperature measured by the temperature sensor exceeds the set value, the second alarm information indicating that the situation is more severe than the first alarm information is output. The pump control system described.   The pump as described in any one of Claims 1-5 provided with the fuse which fuses when the electric current exceeding setting current flows with respect to the electric power path which supplies electric power from the power supply to the said several electric power supply part. Control system.   The pump control system according to claim 1, wherein the plurality of electric pumps are arranged in series with respect to the fluid path.

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