JP2020007993A - Fluid temperature control system - Google Patents

Abstract

To prevent deterioration of fuel economy of an internal combustion engine.SOLUTION: A fluid temperature control system 1 includes: a cooling water pump 13 for circulating cooling water in a vehicle; an oil pump 14 for circulating oil in the vehicle; and a heat exchanger 20 for exchanging heat between the cooling water and the oil. When an internal combustion engine of the vehicle is in operation, the cooling water pump and the oil pump are operated by receiving supply of first electric power generated by the operation of the internal combustion engine. The fluid temperature control system 1 further includes: a heater 15 for heating the cooling water; and a power source control device 10 for supplying second electric power supplied from a power source different from that of the first electric power to the cooling water pump 13, the oil pump 14 and the heater 15 when the internal combustion engine is stopped.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a fluid temperature control system.

  2. Description of the Related Art Conventionally, there has been known a vehicle capable of switching between traveling by operating an internal combustion engine and traveling by operating a motor (for example, see Patent Document 1).

JP 2010-254150 A

  When the above-described vehicle runs by the operation of the motor, the internal combustion engine is stopped or is in an idle state, so that the temperatures of the cooling water and the oil are reduced. As the running time by the operation of the motor becomes longer, the amount of decrease in the temperature of the cooling water and the temperature of the oil increases.

  If the vehicle shifts to running by operation of the internal combustion engine in a state where the temperature of the cooling water and the temperature of the oil have decreased, the fuel efficiency of the internal combustion engine deteriorates.

  An object of the present disclosure is to provide a fluid temperature control system that can prevent deterioration of fuel efficiency of an internal combustion engine.

  A fluid temperature control system according to an aspect of the present disclosure includes a first fluid pump that circulates a first fluid in a vehicle, a second fluid pump that circulates a second fluid in the vehicle, the first fluid and the first fluid. A heat exchanger for exchanging heat with the second fluid, wherein the first fluid pump and the second fluid pump are generated by the operation of the internal combustion engine when the internal combustion engine of the vehicle is operating. A fluid temperature control system that operates by receiving a supply of a first power, wherein a heating device that heats the first fluid, and a heating device that is supplied from a power source different from the first power when the internal combustion engine is stopped. And a power supply controller for supplying two electric powers to the first fluid pump, the second fluid pump, and the heating device.

  According to the present disclosure, it is possible to prevent fuel economy of the internal combustion engine from deteriorating.

Schematic diagram illustrating a configuration of a fluid temperature control system according to an embodiment of the present disclosure. 1 is a block diagram illustrating a configuration of a power supply control device according to an embodiment of the present disclosure. Flowchart showing operation of the power supply control device according to the embodiment of the present disclosure

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

  First, a configuration of a fluid temperature control system 1 according to an embodiment of the present disclosure will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating a configuration of a fluid temperature control system 1 according to the present disclosure. In FIG. 1, broken arrows indicate the flow of electric power, and other arrows indicate the flow of fluid (cooling water or oil).

  The fluid temperature control system 1 is equipped with an internal combustion engine (not shown) and a motor (not shown), and travels by operating the internal combustion engine (hereinafter, referred to as internal combustion engine traveling) and traveling by operating the motor (hereinafter, referred to as motor traveling). ) Is mounted on vehicles that can switch between them. In the present embodiment, it is assumed that the internal combustion engine stops when motor running is being executed. Further, in the present embodiment, a vehicle (for example, a trolley bus or a trolley truck) capable of receiving power from an overhead line via a pantograph (not shown) will be described as an example. The motor operates by electric power from an overhead wire.

  The fluid temperature control system 1 includes a power supply control device 10, a cooling water pump 13, an oil pump 14, a heating device 15, and a heat exchanger 20 as main components.

  An ACG (Alternating Current Generator) 11 generates AC power by the operation force of the internal combustion engine and outputs the generated AC power to the power supply control device 10 when the internal combustion engine is running. On the other hand, when the motor running is being performed, the internal combustion engine is stopped, and thus the ACG 11 does not generate electric power. Hereinafter, the power output from the ACG 11 to the power control device 10 is referred to as “first power”.

  Inverter 12 converts DC power supplied from the overhead line via a pantograph to AC power when motor running is performed, and outputs the AC power to power supply control device 10. Hereinafter, the power output from inverter 12 to power supply control device 10 is referred to as “second power”.

  The power control device 10 supplies the first power to the cooling water pump 13 and the oil pump 14 when the internal combustion engine is running. On the other hand, when switching from running the internal combustion engine to running the motor, the power supply control device 10 starts supplying the second power to the cooling water pump 13, the oil pump 14, and the heating device 15. Details of the configuration and operation of the power supply control device 10 will be described later with reference to FIGS.

  The cooling water pump 13 is operated by electric power supplied from the power supply control device 10, and circulates cooling water in the cooling water circuit 30. The cooling water circuit 30 is a circuit through which cooling water flows, and includes, for example, a cooling water pump 13, a heating device 15, a radiator 16, a device group 17, a heating device 18, and the heat exchanger 20, but is not limited thereto. Details of the flow of the cooling water in the cooling water circuit 30 will be described later. The devices to which the cooling water is supplied are, for example, an internal combustion engine, a heating device 15, a radiator 16, a device group 17, a heating device 18, and a heat exchanger 20. The cooling water corresponds to an example of a “first fluid”, and the cooling water pump 13 corresponds to an example of a “first fluid pump”.

  The heating device 15 is provided upstream of the heating device 18. The heating device 15 is operated by electric power supplied from the power supply control device 10 to heat the cooling water. The heating device 15 is, for example, a block heater provided in a cylinder block, but is not limited thereto.

  The radiator 16 performs heat exchange between the air outside the vehicle and the cooling water. The device group 17 is, for example, an EGR cooler, a transmission, and a reservoir tank, but is not limited thereto. The heating device 18 is, for example, a device that sends out warm air into the vehicle interior to warm the interior of the vehicle.

  The oil pump 14 is operated by electric power supplied from the power supply control device 10 and circulates oil in the oil circuit 40. The oil circuit 40 is a circuit through which oil flows, and includes, for example, the oil pan 21, the oil pump 14, the heat exchanger 20, and the device group 19, but is not limited thereto. The details of the flow of oil in the oil circuit 40 will be described later. The devices to which the oil is supplied are, for example, the internal combustion engine, the device group 19, and the heat exchanger 20. The oil corresponds to an example of the “second fluid”, and the oil pump 14 corresponds to an example of the “second fluid pump”.

  The device group 19 includes, but is not limited to, camshaft bearings, rocker arms, timing chains, turbochargers, hydraulically operated injectors, check valves, piston cooling jets, idle gear shafts, vacuum pumps, chain tensioners, and the like.

  The heat exchanger 20 performs heat exchange between cooling water and oil. The heat exchanger 20 is, for example, an oil cooler.

  The configuration of the fluid temperature control system 1 has been described above.

  Next, the flow of cooling water and oil in the fluid temperature control system 1 will be described with reference to FIG. As described above, the cooling water flows through the cooling water circuit 30 and the oil flows through the oil circuit 40. That is, the cooling water and the oil circulate in different flow paths.

  First, the flow of oil in the oil circuit 40 will be described.

  As indicated by the solid arrow in the drawing, the oil stored in the oil pan 21 is pumped up by the oil pump 14, passes through the heat exchanger 20, the device group 19, and returns to the oil pan 21.

  Next, the flow of cooling water in the cooling water circuit 30 will be described. The flow of the cooling water differs between when the internal combustion engine is running and when the motor is running.

  The flow of the cooling water during the running of the internal combustion engine is as shown by the solid line arrow and the dashed line arrow in the figure. That is, the cooling water sent from the cooling water pump 13 flows into the radiator 16, the device group 17, and the heating device 18 after passing through the inactive heating device 15. The cooling water that has passed through the radiator 16 and the device group 17 flows downstream of the heat exchanger 20 and returns to the cooling water pump 13. The cooling water that has passed through the heating device 18 passes through the heat exchanger 20 and returns to the cooling water pump 13. The inactive state is a state in which power is not supplied to the heating device 15 and the heating device 15 is not operating. Therefore, when the heating device 15 is in the non-operation state, the cooling water is not heated.

  The flow of the cooling water during motor running is as shown by the solid line arrow and the two-dot chain line arrow in the figure. That is, the cooling water sent from the cooling water pump 13 is heated by passing through the heating device 15 in the operating state. Here, the operating state is a state in which electric power is supplied to the heating device 15 and the heating device 15 is operating. Therefore, when the heating device 15 is in the operating state, the cooling water is heated. The heated cooling water flows into the downstream side of the heat exchanger 20, the device group 17, and the heating device 18. The cooling water that has passed through the device group 17 flows downstream of the heat exchanger 20 and returns to the cooling water pump 13. The cooling water that has passed through the heating device 18 passes through the heat exchanger 20. At this time, heat exchange is performed between the cooling water and the oil. The cooling water that has passed through the heat exchanger 20 returns to the cooling water pump 13. The cooling water heated by the heating device 15 may directly flow into the heat exchanger 20.

  As described above, when the motor is running, the cooling water is heated by the heating device 15, and the heat exchanger 20 exchanges heat between the heated cooling water and the oil. Thereby, the temperature of the oil increases.

  The flow of the cooling water and the oil in the fluid temperature control system 1 has been described above.

  Next, the configuration of the power supply control device 10 will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration of the power supply control device 10.

  As illustrated in FIG. 2, the power supply control device 10 includes a determination unit 101 and a control unit 102.

  Although not shown, the power supply control device 10 includes, for example, a CPU (Central Processing Unit), a storage medium such as a ROM (Read Only Memory) storing a control program, a working memory such as a RAM (Random Access Memory), and the like. It has a communication circuit. The functions of the determination unit 101 and the control unit 102 described below are realized by the CPU executing a computer program.

  The determination unit 101 determines whether or not the driving has been switched from the internal combustion engine driving to the motor driving.

For example, the determination unit 101 determines that the driving has been switched from the internal combustion engine running to the motor running when a predetermined set time has elapsed while all of the following conditions 1 to 5 are satisfied. The set time is a time for preventing chattering due to data hunting.
Condition 1: The voltage input from the pantograph is higher than a predetermined set voltage.
Condition 2: The start operation of the motor running by the occupant of the vehicle is received.
Condition 3: Various devices of the vehicle (including the inverter 12) are operating normally.
Condition 4: the inter-vehicle distance between the preceding vehicle and the following vehicle is larger than a predetermined distance.
Condition 5: The traveling environment of the own vehicle is in an environment where motor traveling can be continued.

  Note that the determining unit 101 may determine that the driving has been switched from the internal combustion engine driving to the motor driving when the set time has elapsed while at least the conditions 1 and 2 are satisfied.

  Further, when the determination unit 101 receives, from a control device (not shown) that controls switching between the internal combustion engine traveling and the motor traveling, information indicating that the internal combustion engine traveling has been switched to the motor traveling, It may be determined that the mode has been switched to the motor running.

  Further, after the operation of the cooling water pump 13, the oil pump 14, and the heating device 15 by the supply of the second electric power is started, the determination unit 101 determines whether or not to stop the operations.

For example, the determination unit 101 determines that the operations of the cooling water pump 13, the oil pump 14, and the heating device 15 are stopped when all of the following conditions 6 to 9 are satisfied.
Condition 6: The temperature of the cooling water is equal to or higher than a predetermined set water temperature.
Condition 7: The oil temperature is equal to or higher than a predetermined oil temperature.
Condition 8: the temperature of the outside air is equal to or higher than a predetermined set temperature.
Condition 9: the atmospheric pressure is equal to or higher than a predetermined set pressure.

  The above-described values of the temperature of the cooling water, the oil, and the outside air and the value of the atmospheric pressure are respectively detected by sensors (not shown) and input to the power supply control device 10. Further, the above-described set water temperature, set oil temperature, set temperature, and set pressure can prevent deterioration of fuel efficiency of the internal combustion engine and reduce emission of exhaust gas when shifting from motor running to internal combustion engine running, respectively. Value. These set values are determined based on experiments and simulations performed in advance.

  Note that the determination unit 101 may determine that the operations of the cooling water pump 13, the oil pump 14, and the heating device 15 are stopped when at least the condition 7 is satisfied.

  When the determination unit 101 determines that the running has been switched from the internal combustion engine running to the motor running, the control unit 102 starts supplying the second power to the cooling water pump 13, the oil pump 14, and the heating device 15. Thereby, the heating device 15 starts the heating operation. Further, the cooling water pump 13 and the oil pump 14, which have been operated by the first electric power, operate by the second electric power.

  In addition, when the determination unit 101 determines that the operations of the cooling water pump 13, the oil pump 14, and the heating device 15 are to be stopped, the control unit 102 transmits the second control signal to the cooling water pump 13, the oil pump 14, and the heating device 15. Stop supplying power. Thus, the operation of the heating device 15, the cooling water pump 13, and the oil pump 14 is stopped.

  The configuration of the power supply control device 10 has been described above.

  Next, the operation of the power supply control device 10 will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the power supply control device 10. The flow in FIG. 3 is started when the internal combustion engine runs.

  The determination unit 101 determines whether or not the driving has been switched from the internal combustion engine driving to the motor driving (step S1).

  When the determination unit 101 determines that the driving has not been switched from the internal combustion engine driving to the motor driving (step S1: NO), the flow returns to step S1.

  On the other hand, when the determination unit 101 determines that the driving has been switched from the internal combustion engine driving to the motor driving (step S1: YES), the control unit 102 transmits the second electric power to the cooling water pump 13, the oil pump 14, and the heating device 15. The supply is started (step S2).

  Next, the determination unit 101 determines whether to stop the operations of the cooling water pump 13, the oil pump 14, and the heating device 15 (Step S3).

  When the determination unit 101 determines that the operations of the cooling water pump 13, the oil pump 14, and the heating device 15 are not stopped (step S3: NO), the flow returns to step S3. In this case, the cooling water pump 13, the oil pump 14, and the heating device 15 continue to operate.

  On the other hand, when the determination unit 101 determines that the operations of the cooling water pump 13, the oil pump 14, and the heating device 15 are to be stopped (step S3: YES), the control unit 102 controls the cooling water pump 13, the oil pump 14, and the heating. The supply of the second power to the device 15 is stopped.

  Note that the control unit 102 stops the supply of the second power to the cooling water pump 13, the oil pump 14, and the heating device 15 and then restarts the internal combustion engine (for example, switching from motor running to internal combustion engine running). In this case, the first electric power is supplied to the cooling water pump 13 and the oil pump 14. Thereby, the cooling water pump 13 and the oil pump 14 operate.

  The operation of the power supply control device 10 has been described above.

  As described above in detail, the fluid temperature control system 1 according to the present embodiment is configured such that when the internal combustion engine is stopped (for example, when the internal combustion engine is switched from running to motor running), the heating device is supplied with the second electric power. 15, the cooling water pump 13 and the oil pump 14 are operated to perform heat exchange between heated cooling water and oil.

  Therefore, the fluid temperature control system 1 of the present embodiment can prevent the oil temperature from decreasing when the internal combustion engine is stopped (for example, when the motor is running). Therefore, when the stopped internal combustion engine starts (for example, when the driving mode is switched from the motor running to the internal combustion engine running), it is possible to prevent the fuel efficiency of the internal combustion engine from deteriorating. As a result, the amount of exhaust gas emission can be reduced.

  In the fluid temperature control system 1 according to the present embodiment, the heated cooling water is supplied to the heating device 18. Therefore, the heating device 18 can be operated even when the internal combustion engine is stopped.

  Further, for example, in an extremely cold region, if the internal combustion engine is stopped, it may not be possible to restart the internal combustion engine. Therefore, the internal combustion engine may be in an idle state for a long time. On the other hand, in the fluid temperature control system 1 according to the present embodiment, since the internal combustion engine can be restarted even in an extremely cold region, it is not necessary to idle the internal combustion engine for a long time. Therefore, the amount of exhaust gas emission can be reduced.

  Further, since the fluid temperature control system 1 of the present embodiment does not directly heat oil, there is no possibility that a fire will occur.

  As described above, the embodiments of the present disclosure have been described in detail. However, the present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present disclosure. It is. Hereinafter, each modified example will be described.

[Modification 1]
In the embodiment, the case where power is supplied from the overhead line to the vehicle has been described as an example, but the present invention is not limited to this. For example, power may be supplied to the vehicle from a power supply device installed on a road surface, a roadside, or the like. The power supply method may be wireless power supply.

[Modification 2]
In the embodiment, an example will be described in which second power is power output from inverter 12 to power supply control device 10 (in other words, second power is power supplied from outside the vehicle). However, the present invention is not limited to this. For example, the second power may be power stored in a vehicle battery. In this case, when switching from the internal combustion engine running to the motor running, the power supply control device 10 supplies the electric power from the vehicle-mounted battery to the cooling water pump 13, the oil pump 14, and the heating device 15. In that case, the vehicle may be, for example, a plug-in hybrid vehicle.

[Modification 3]
The control unit 102 of the power supply control device 10 stops the supply of the second power when any of the cooling water pump 13, the oil pump 14, and the heating device 15 is in operation (overload, leakage, etc.). May be. Thereby, safety can be ensured.

[Modification 4]
The control unit 102 of the power supply control device 10 is configured to stop the supply of the second power to the cooling water pump 13, the oil pump 14, and the heating device 15, and to continue the motor running after a predetermined time has elapsed. The supply of the second electric power to the cooling water pump 13, the oil pump 14, and the heating device 15 may be started again. This can prevent the temperature of the cooling water and the temperature of the oil from decreasing after the supply of the second power is stopped.

[Modification 5]
In the embodiment, the case where the internal combustion engine stops while the motor is running has been described as an example, but the internal combustion engine may be in an idle state while the motor is running. Also in this case, similarly to the embodiment, the control unit 102 of the power supply control device 10 may start supplying the second power to the cooling water pump 13, the oil pump 14, and the heating device 15.

[Modification 6]
In the embodiment, the case where cooling water is used has been described as an example. However, a liquid other than water or a gas may be used. When using gas instead of cooling water, the cooling water pump 13 shown in FIG. 1 is replaced with a valve. This valve has a function of, for example, taking in a traveling wind (an example of gas) when the vehicle travels from a gas supply port such as a grill or an underfloor. Note that the gas may be a gas (for example, compressed air) provided in the vehicle in advance. The gas exchanged with oil by the heat exchanger 20 may be discharged to the outside by a valve. For example, the valve has a flow path that connects any two of a gas supply source, an inlet of the heating device 15, and an outlet of the heat exchanger 20.

  As above, each modification has been described. In addition, you may combine each modification suitably.

  The fluid temperature control system of the present disclosure is useful for controlling the temperature of a fluid flowing in a vehicle.

DESCRIPTION OF SYMBOLS 1 Fluid temperature control system 10 Power supply controller 11 ACG
DESCRIPTION OF SYMBOLS 12 Inverter 13 Cooling water pump 14 Oil pump 15 Heating device 16 Radiator 17, 19 Device group 18 Heating device 20 Heat exchanger 21 Oil pan 30 Cooling water circuit 40 Oil circuit 101 Judgment part 102 Control part

Claims (7)

A first fluid pump for circulating the first fluid in the vehicle, a second fluid pump for circulating the second fluid in the vehicle, and a heat exchange for exchanging heat between the first fluid and the second fluid Wherein the first fluid pump and the second fluid pump receive the first electric power generated by the operation of the internal combustion engine and operate when the internal combustion engine of the vehicle is operating. A temperature control system,
A heating device for heating the first fluid;
When the internal combustion engine is stopped, a power supply control device that supplies second power supplied from a power source different from the first power to the first fluid pump, the second fluid pump, and the heating device. Have,
Fluid temperature control system. The vehicle is a vehicle that can switch between traveling by operation of the internal combustion engine and traveling by operation of a motor that operates by the second electric power,
The power control device,
When traveling by operation of the internal combustion engine is being executed, the first electric power is supplied to the first fluid pump and the second fluid pump,
When the traveling by the operation of the internal combustion engine is switched to the traveling by the operation of the motor, the second electric power is supplied to the first fluid pump, the second fluid pump, and the heating device.
The fluid temperature control system according to claim 1. The power control device,
When the temperature of the second fluid is equal to or higher than a predetermined temperature, the supply of the second power is stopped.
The fluid temperature control system according to claim 1. The power control device,
When an abnormality occurs in any of the first fluid pump, the second fluid pump, or the heating device, the supply of the second power is stopped.
The fluid temperature control system according to claim 1. The second power is
Power supplied from outside the vehicle,
The fluid temperature control system according to claim 1. The first fluid is cooling water;
The second fluid is oil;
The fluid temperature control system according to claim 1. The heating device is a block heater,
The fluid temperature control system according to claim 6.

Images