WO2023112898A1 - 流量制御方法、流量制御装置、及び冷却システム - Google Patents
流量制御方法、流量制御装置、及び冷却システム Download PDFInfo
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- WO2023112898A1 WO2023112898A1 PCT/JP2022/045700 JP2022045700W WO2023112898A1 WO 2023112898 A1 WO2023112898 A1 WO 2023112898A1 JP 2022045700 W JP2022045700 W JP 2022045700W WO 2023112898 A1 WO2023112898 A1 WO 2023112898A1
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- battery
- heat medium
- temperature
- flow rate
- cooling water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/25—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by controlling the electric load
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
- B60L1/003—Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
- B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L9/00—Electric propulsion with power supply external to the vehicle
- B60L9/16—Electric propulsion with power supply external to the vehicle using AC induction motors
- B60L9/18—Electric propulsion with power supply external to the vehicle using AC induction motors fed from DC supply lines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/425—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/52—Drive Train control parameters related to converters
- B60L2240/525—Temperature of converter or components thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
Definitions
- the present invention relates to a flow rate control method, a flow rate control device, and a cooling system for controlling the flow rate of a heat medium.
- Patent Document 1 a battery system that warms up a battery that is mounted on a vehicle and is charged and discharged.
- This battery system includes an assembled battery, charging/discharging means, heat exchanging means, conveying means, and a control device.
- the assembled battery is configured by electrically connecting a plurality of battery cells.
- the charging/discharging means is connected to the assembled battery by wire, and performs ripple charging/discharging in which charging and discharging are alternately performed many times per second with the assembled battery.
- the heat exchange means is provided so that heat exchange is performed between the heat generated from the charging/discharging means and the heat transport medium.
- the transport means transports the heat transport medium toward the assembled battery.
- the control device controls each operation of the charging/discharging means and the conveying means.
- the control device determines that the temperature of the assembled battery is low and a predetermined output cannot be obtained, it controls the operation of the charging/discharging means so that ripple charging/discharging is performed, and further receives heat generated from the charging/discharging means.
- the operation of the conveying means is controlled so that the heat transport medium is conveyed to the assembled battery.
- the problem to be solved by the present invention is to provide a flow rate control method, a flow rate control device, and a cooling system that can efficiently raise the temperature of the battery by ripple charge/discharge.
- the present invention provides a vehicle equipped with a motor for driving the vehicle, a battery capable of supplying power to the motor, and a power conversion device provided between the motor and the battery, when the temperature of the battery is lower than a predetermined threshold temperature.
- an execution command for ripple charge/discharge which alternately charges and discharges multiple times with the battery, is output to the power conversion device, and during the execution of ripple charge/discharge, the temperature of the battery heat exchanges with the battery
- the above problem is solved by controlling the flow rate of the heat medium so that when the temperature is higher than the temperature of the medium, the flow rate of the heat medium is smaller than when the temperature of the battery is lower than the temperature of the heat medium.
- the battery can be efficiently heated by ripple charge/discharge.
- the cooling system 100 includes a driving battery 1, a motor 2, an inverter 3, a DCDC converter 4, an auxiliary battery 5, and an onboard charger 6, which are electrically connected by wire harnesses or bus bars.
- a driving battery 1 a motor 2
- an inverter 3 is provided between the drive battery 1 and the motor 2
- a wire harness connecting the drive battery 1 and the inverter 3 is connected to a DCDC converter 4 and an on-vehicle charger 6.
- the auxiliary battery 5 is also connected to the DCDC converter 4 .
- the cooling system 100 also includes a flow controller 20 with a controller 21 . The flow control device 20 will be described later.
- the cooling system 100 is provided with a cooling water flow path 11 as a cooling water passage.
- cooling water will be described as an example of a heat medium that exchanges heat with the drive battery 1, the inverter 3, the motor 2, and the vehicle charger 6.
- FIG. 1 the cooling water flow path 11 is provided with a chiller 12, a radiator 15, valves A to C, and a pump A.
- the cooling water flow path 11 is provided around each component so as to be able to cool the drive battery 1, the inverter 3, the motor 2, and the onboard charger 6, which are objects to be cooled.
- the arrangement method or installation method of the cooling water flow path 11 is not particularly limited. is provided.
- the cooling water flow path 11 is configured so that the cooling water can circulate by opening/closing control of a valve by a flow rate control device 20, which will be described later.
- the driving battery 1 is configured to be able to supply electric power to the motor 2 that is the driving source of the electric vehicle.
- the driving battery 1 for example, an assembled battery composed of a nickel-hydrogen secondary battery, a lithium secondary battery, or the like can be used.
- a battery pack is an assembly of a plurality of battery cells connected in series and has a predetermined internal resistance.
- a ripple current is input from the inverter 3 to the driving battery 1 .
- a ripple current is a current having a charge-discharge pattern in which charge and discharge are alternately repeated in a pulse shape. When a ripple current is input to the driving battery 1, charging and discharging corresponding to the ripple current are alternately repeated, and a current due to charging and discharging flows through the internal resistance.
- Drive battery 1 is also provided with a temperature sensor (not shown) for detecting the temperature of drive battery 1 .
- the temperature of drive battery 1 detected by the temperature sensor is output to flow control device 20 .
- the drive battery 1 corresponds to an example of the battery in the present invention.
- the motor 2 is a drive motor that generates torque for driving the drive wheels of the electric vehicle.
- the motor 2 generates driving force from AC power supplied from the inverter 3, and the generated driving force is transmitted to the driving wheels via a speed reducer (not shown).
- a speed reducer not shown.
- AC power is output from the motor 2 to the inverter 3 by the rotation of the motor 2 .
- the motor 2 is, for example, a three-phase AC motor.
- the motor 2 corresponds to an example of the motor in the present invention.
- the inverter 3 is a power conversion device that converts the DC power input from the drive battery 1 into AC power and outputs the converted AC power to the motor 2 . Further, as described above, when AC power is output from the motor 2 to the inverter 3, the inverter 3 converts the AC power from the motor 2 into DC power and outputs the converted DC power to the drive battery 1. Also functions as a device.
- the inverter 3 is electrically connected to the flow control device 20 and operates according to control signals from the controller 21 .
- the smoothing capacitor is a capacitor for smoothing the input/output voltage of the driving battery 1 .
- the smoothing capacitor is connected between the three pairs of series circuits and the connection terminals of the drive battery 1 .
- an electrical circuit such as a gate driver that boosts the control signal from the controller 21 to the operating voltage of the switching element that constitutes the inverter 3 and converts it into a control signal for the switching element.
- the inverter 3 corresponds to an example of the power converter in the present invention.
- the DCDC converter 4 steps down the voltage of the driving battery 1 and outputs the stepped-down voltage to the auxiliary battery 5 .
- the auxiliary machine battery 5 is a battery for supplying power to each auxiliary machine (each load) mounted on the electric vehicle. Further, the auxiliary battery 5 is charged with electric power from the DCDC converter 4 .
- the on-board charger 6 is a device that operates when the driving battery 1 is charged by a power supply facility provided outside the electric vehicle.
- power supply facilities power supply facilities compatible with the normal charging system and power supply facilities compatible with the quick charging system are known.
- the normal charging method is a method of charging the drive battery 1 using a single-phase AC 100V or 200V power source.
- the rapid charging method is a method of charging the drive battery 1 using a three-phase 200V power source. The rapid charging method can charge the battery to full charge in a shorter time than the normal charging method.
- the vehicle-mounted charger 6 is used to charge the driving battery 1 by a normal charging method.
- the onboard charger 6 is electrically connected to the charging port of the electric vehicle.
- the vehicle-mounted charger 6 converts the input AC power into DC power and outputs the converted DC power to the driving battery 1 .
- the vehicle-mounted charger 6 corresponds to an example of the vehicle-mounted charger in the present invention.
- the chiller 12, the compressor 13, and the condenser 14 constitute a cooling circuit driven by the auxiliary battery 5, for example.
- the cooling circuit as shown in FIG. 1, has a cooling gas passage through which the cooling gas can be circulated.
- the compressor 13 compresses the cooling gas and discharges a high-temperature, high-pressure compressed cooling gas.
- the condenser 14 performs heat exchange between the compressed cooling gas and the cooling gas flowing through the cooling gas passage, and radiates the heat of the compressed cooling gas, thereby cooling the compressed cooling gas.
- the chiller 12 is a device for cooling cooling water before heat exchange with the drive battery 1 is performed.
- the chiller 12 is provided between the onboard charger 6 and the drive battery 1 in the cooling water flow path 11 .
- the chiller 12 exchanges heat between the cooling gas flowing through the cooling gas passage and the cooling water flowing through the cooling water passage 11, and absorbs the heat of the cooling water flowing through the cooling water passage 11. to cool the cooling water.
- a control signal is input to the chiller 12 from the controller 21, and the chiller 12 operates or stops according to the control signal.
- the chiller 12 operates, the cooling water flowing from the onboard charger 6 side is cooled as described above. On the other hand, when the chiller 12 stops, the cooling water flowing from the onboard charger 6 side is not cooled.
- the valve A is provided between the chiller 12 and the drive battery 1 in the cooling water flow path 11 .
- the valve A is electrically connected to the flow control device 20 and opens and closes according to control signals from the controller 21 .
- the control signal from the controller 21 opens the valve A, the cooling water that has passed through the chiller 12 is sent to the driving battery 1 .
- the control signal from the controller 21 closes the valve A, cooling water is not sent to the driving battery 1 .
- the valve B is provided in a branched path between the vehicle-mounted charger 6 and the chiller 12 in the cooling water flow path 11 .
- the branch path provided with the valve B is the vehicle charger 6 and the vehicle charger 6.
- Valve B is a bypass valve for sending cooling water to other devices without sending cooling water to drive battery 1 .
- the valve B is electrically connected to the flow control device 20 and opens and closes according to control signals from the controller 21 .
- valve A and valve B correspond to an example of the valve in the present invention.
- the pump A is a water pump for sending cooling water to the cooling water flow path 11 .
- the pump A is provided between the driving battery 1 and the valve B and the radiator 15 and the valve C in the cooling water passage 11 .
- the pump A is electrically connected to the flow control device 20 and operates or stops according to control signals from the controller 21 .
- the cooling water sent from the pump A is sent to the valve C after being cooled by the radiator 15.
- the pump A is stopped by the control signal from the controller 21 , the cooling water is not sent from the pump A and no cooling water flows through the cooling water passage 11 .
- the pump A functions as means for conveying cooling water in the cooling water flow path 11 .
- the radiator 15 is a device for cooling cooling water before heat is exchanged between the motor 2 and the inverter 3.
- the radiator 15 is provided between the pump A, the motor 2 and the inverter 3 in the cooling water flow path 11 .
- the radiator 15 is operated by a predetermined control device, and the cooling water sent from the pump A is cooled by the radiator 15 .
- Valve C has the function of controlling the water flow rate on the radiator output side. Specifically, the valve C controls the water flow rate of the radiator 15 so that the water passing through the radiator does not cool the motor 2 and the inverter 3 until the water temperature rises to a predetermined temperature. That is, the valve C has a function equivalent to that of a thermostat of an engine radiator. Therefore, the valve C controls the amount of water in the radiator 15 using the water temperature at the inlet of the inverter 3 or the outlet of the valve C as a target value (for example, only the water in the radiator is stopped or the amount of water is reduced). When the water temperature at the inlet is 40° C. or higher, the valve C is opened to allow the water in the radiator 15 to flow. When the water temperature at the inlet of the inverter 3 is less than 40° C., the water supply to the radiator 15 is stopped (the flow of water to the radiator 15 is stopped) to suppress the water temperature at the inlet of the inverter 3 from dropping.
- the flow control device 20 has a controller 21 capable of implementing the flow control method of the present invention.
- the controller 21 is configured as an electronic control unit consisting of a computer with hardware and software.
- the computer of the controller 21 can access a ROM (Read Only Memory) for executing warm-up control, cooling control, and flow rate control, and a CPU (Central Processing Unit) for executing the program stored in this ROM.
- ROM Read Only Memory
- CPU Central Processing Unit
- It consists of RAM (Random Access Memory) that functions as a simple storage device.
- MPU Micro Processing Unit
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- FPGA Field Programmable Gate Array
- the flow control device 20 corresponds to an example of the flow control device in the present invention.
- a warm-up function realized by the controller 21 will be described.
- the controller 21 controls the inverter 3 by the warm-up function so that the drive battery 1 performs ripple charging and discharging in which charging and discharging are repeated multiple times.
- a warm-up request is a signal for raising the temperature of the driving battery 1 by ripple charge/discharge.
- a warm-up request is input to the controller 21 at least when the temperature of the drive battery 1 is lower than a predetermined warm-up target threshold (unit: temperature).
- the warm-up target threshold is a predetermined temperature, for example, 10°C.
- the controller 21 acquires the temperature of the drive battery 1 from a temperature sensor that detects the temperature of the drive battery 1 .
- the controller 21 compares the temperature of the drive battery 1 with the warm-up target threshold, and if the temperature of the drive battery 1 is lower than the warm-up target threshold, the switching element that constitutes the inverter 3 is switched by the pulse width modulation method.
- a control signal for ripple charge/discharge to turn on or off is generated.
- the control signal for ripple charging/discharging is a control signal for causing a pulse-shaped ripple current, in which charging and discharging are alternately repeated at a predetermined cycle, to flow from the inverter 3 to the drive battery 1 .
- a method of generating a control signal for ripple charge/discharge in this embodiment will be described.
- a pulse width modulation method that generates a gate drive signal to a switching element based on a comparison between a three-phase AC voltage command value and a carrier wave has been known.
- the controller 21 compares the carrier wave having a phase corresponding to each phase of the motor 2 with the three-phase AC voltage value instead of the same carrier wave having no phase difference, and outputs the ripple to the switching element of each phase.
- the controller 21 compares the U-phase AC voltage command value with the carrier wave A to generate a control signal for ripple charge/discharge to the U-phase switching element.
- the controller 21 also compares the V-phase AC voltage command value and the carrier wave B to generate a control signal for ripple charge/discharge to the V-phase switching element, and compares the W-phase AC voltage command value and the carrier wave B. Based on the comparison, a control signal for ripple charge/discharge to the W-phase switching element is generated.
- a ripple current having the same component as the frequency of the carrier wave (carrier frequency) can be generated.
- the amount of heat generated by the internal resistance can be increased, and the temperature rise rate of the drive battery 1 can be increased.
- the carrier wave A and carrier wave B having a phase difference of 180 degrees described above is merely an example, and the phase difference between the carrier waves is not limited to 180 degrees. In order to obtain the above-described effect, it is sufficient to use carrier waves with different phases for two or more phases of the motor 2 .
- the controller 21 outputs a control signal for ripple charge/discharge to the inverter 3 as an execution command to the inverter 3 .
- the switching elements of each phase are repeatedly turned on and off by the ripple charge/discharge control signal, and a ripple current flows from the inverter 3 to the driving battery 1 .
- a warm-up request may be input to the controller 21 .
- the state of the electric vehicle for ripple charging/discharging includes a state in which the drive battery 1 is being charged from a power supply facility provided outside the electric vehicle, and a state in which the electric vehicle is stopped with the ignition switch turned on. , and at least one of a state in which the ignition switch is turned off and the warm-up switch is turned on.
- the warm-up switch is provided inside the vehicle and can be operated by the passenger to warm up the driving battery 1 .
- the cooling function is a function for cooling the driving battery 1 .
- the controller 21 uses the cooling function to output a control signal to the chiller 12 to operate the chiller 12 , and causes the chiller 12 to cool the cooling water sent to the drive battery 1 . Cooling the cooling water sent to the driving battery 1 promotes heat dissipation from the driving battery 1 to the cooling water, thereby cooling the driving battery 1 .
- a cooling request is a signal for operating the chiller 12 .
- a cooling request is input to the controller 21 at least when the temperature of the driving battery 1 is higher than a predetermined cooling threshold (unit: temperature).
- the cooling threshold is a temperature higher than the warm-up target threshold described above.
- the cooling water before heat exchange with the driving battery 1 is the cooling water flowing through the cooling water flow path 11 between the chiller 12 and the driving battery 1 .
- a water temperature sensor (not shown) for detecting the temperature of the cooling water is provided between the chiller 12 and the valve A in the cooling water flow path 11 .
- the temperature of the cooling water before heat exchange with drive battery 1 detected by the water temperature sensor is output to flow control device 20 .
- the water temperature sensor may be provided between the valve A and the drive battery 1 in the cooling water flow path 11 .
- the controller 21 increases the flow rate of the cooling water before heat exchange with the drive battery 1 by increasing the flow rate of the cooling water that exchanges heat with the inverter 3 and the cooling water that exchanges heat with the motor 2.
- the flow rate of the cooling water that exchanges heat with the motor 2 and The flow rate of cooling water that exchanges heat with the inverter 3 can be controlled independently of each other. Therefore, the controller 21 allows the motor 2 and the inverter 3 to be arranged in parallel in the cooling water flow path 11, and the temperature of the drive battery 1 to be heat exchanged with the drive battery 1 during the ripple charging/discharging.
- the total value of the cooling water flow rate for heat exchange with the inverter 3 and the cooling water flow rate for heat exchange with the motor 2 is The opening and closing of valves A and B are controlled so as to increase the flow rate of water.
- the controller 21 controls the cooling water that has received the heat generated by the inverter 3, The opening and closing of the valves A and B are controlled so that the cooling water that receives the heat generated by the motor 2 exchanges heat with the driving battery 1 .
- controller 21 circulates the cooling water between each device. The opening and closing of valves A and B are controlled so that heat exchange takes place.
- FIG. 2 shows, from the top, temperature (temperature of driving battery 1, temperature of cooling water before heat exchange with driving battery 1), opening/closing state of valve A, opening/closing state of valve B, operating state of pump A, drive The input/output current to the drive battery 1, the amount of cooling water in the drive battery 1, the amount of cooling water in the motor 2 and the inverter 3, the vehicle speed of the electric vehicle, and the parking lock state of the electric vehicle are shown.
- the horizontal axis indicates time.
- Time t0 is the time when ripple charging/discharging of the driving battery 1 is started.
- the controller 21 outputs a control signal for operating the pump A to the pump A, and sends cooling water to the cooling water flow path 11 . Further, the controller 21 outputs a control signal for closing the valve A to the valve A, and outputs a control signal for opening the valve B to the valve B.
- FIG. 3(A) is a diagram showing how cooling water does not flow to the driving battery 1 in the cooling system 100 shown in FIG.
- the valve A is closed and the valve B is opened, as shown in FIG. and the pump A circulate through the cooling water flow path 11 in this order.
- the valve A since the valve A is closed, the cooling water is not sent to the driving battery 1 and the cooling water does not flow to the driving battery 1 .
- driving battery 1 From time t 0 to time t 1 , driving battery 1 generates heat internally due to ripple charge/discharge, and the temperature of driving battery 1 rises. That is, warm-up control of the driving battery 1 by ripple charge/discharge is executed. Further, in the inverter 3, since the switching element is repeatedly turned on and off in order to perform ripple charge/discharge, the inverter 3 generates heat. In addition, a current due to the ripple current flows through the motor 2, and the motor 2 generates heat. Since the cooling water before heat exchange with the driving battery 1 is heated by the heat generated by the inverter 3 and the motor 2, the temperature of the cooling water before heat exchange with the driving battery 1 also rises.
- controller 21 From time t 0 to time t 1 , the temperature of drive battery 1 is higher than the temperature of the cooling water before heat exchange with drive battery 1, so controller 21 outputs a control signal to close valve A. , and outputs to the valve B a control signal for opening the valve B. Between time t 0 and time t 1 , cooling water does not flow to drive battery 1, as shown in FIG. 3(A).
- the controller 21 outputs a control signal for opening the valve A to the valve A, and outputs a control signal for closing the valve B to the valve B.
- FIG. 3(B) is a diagram showing how cooling water flows through the drive battery 1 in the cooling system 100 shown in FIG.
- the valve A When the valve A is opened and the valve B is closed, as shown in FIG.
- the driving battery 1 and the pump A circulate through the cooling water flow path 11 in this order. Since the valve A is opened, the cooling water is sent to the drive battery 1 and the cooling water flows through the drive battery 1 .
- the temperature of drive battery 1 becomes higher than the temperature of the cooling water before heat exchange with drive battery 1 .
- the controller 21 outputs a control signal for closing the valve A to the valve A, and outputs a control signal for opening the valve B to the valve B.
- the cooling water is not sent to the driving battery 1 again, and the cooling water does not flow to the driving battery 1 again.
- controller 21 From time t 2 to time t 3 , the temperature of drive battery 1 is higher than the temperature of the cooling water before heat exchange with drive battery 1, so controller 21 outputs a control signal to close valve A. , and outputs to the valve B a control signal for opening the valve B. From time t 2 to time t 3 , cooling water does not flow to drive battery 1, as shown in FIG. 3(A).
- the controller 21 stops outputting the control signal for ripple charge/discharge to the inverter 3 as a ripple charge/discharge stop command.
- the controller 21 also outputs a control signal to the pump A to stop the pump A.
- FIG. Since the pump A stops, cooling water does not flow to the drive battery 1, the motor 2, and the inverter 3.
- the reason why cooling water does not flow through the cooling water flow path 11 is that there is no need for ripple charge/discharge, and since the electric vehicle is stopped, the driving battery 1, the motor 2, and the inverter 3 do not generate heat. Based on the viewpoint that there is no
- the controller 21 outputs to the pump A a control signal for operating the pump A.
- the controller 21 outputs a control signal for opening the valve A to the valve A, and outputs a control signal for closing the valve B to the valve B.
- the cooling water sent from the pump A is cooled by the radiator 15 and then cooled by the inverter 3, the motor 2, the vehicle charger 6, and the driving battery. 1 and the pump A circulate through the cooling water flow path 11 in this order. It is possible to cool the drive battery 1, the motor 2, and the inverter 3, which generate heat as the electric vehicle runs.
- the temperature of the drive battery 1 rises, and as a result, the temperature of the drive battery reaches the cooling threshold at time t5 .
- a cooling request is input to the controller 21 , and the controller 21 outputs a control signal for operating the chiller 12 to the chiller 12 .
- the cooling water before heat exchange with drive battery 1 is cooled, and the cooling of drive battery 1 is promoted. It is assumed that the parking lock is turned on and the electric vehicle is stopped again at time t5 .
- step S1 the controller 21 determines whether there is a request for cooling the driving battery 1 or not.
- a request for cooling drive battery 1 is input to controller 21 at least when the temperature of drive battery 1 is higher than a predetermined cooling threshold. If the cooling request is input to the controller 21, the process proceeds to step S8, and if the cooling request is not input to the controller 21, the process proceeds to step S2.
- step S2 the controller 21 determines whether the electric vehicle is stopped. For example, the controller 21 obtains a signal indicating the operating state of the parking lock mechanism from another control device that controls the operation of the parking lock mechanism to determine whether the parking lock is on or off. If it is determined that the parking lock is on and the vehicle is stopped, the process proceeds to step S3, and if it is determined that the parking lock is off and the vehicle is not stopped, the process proceeds to step S9.
- step S3 the controller 21 compares the temperature of the drive battery 1 with the warm-up target threshold, and determines whether the temperature of the drive battery 1 is lower than the warm-up target threshold.
- the timing for acquiring the temperature of the drive battery 1 from the temperature sensor is not limited, and the controller 21 may acquire the temperature of the drive battery 1 from the temperature sensor in step S3, or may acquire the temperature of the drive battery 1 from the temperature sensor before step S3.
- the temperature of the battery 1 may be obtained from a temperature sensor. If the controller 21 makes an affirmative determination, the process proceeds to step S4, and if the controller 21 makes a negative determination, the process proceeds to step S9.
- the controller 21 may determine whether or not there is a warm-up request for the drive battery 1, as in step S1. That is, the flowchart shown in FIG. 4 may be a flowchart that proceeds to step S4 when a warm-up request is input to the controller 21, and proceeds to step S9 when a warm-up request is not input to the controller 21.
- FIG. 4 the flowchart shown in FIG. 4 may be a flowchart that proceeds to step S4 when a warm-up request is input to the controller 21, and proceeds to step S9 when a warm-up request is not input to the controller 21.
- step S4 the controller 21 outputs a ripple charging/discharging control signal to the inverter 3 as a ripple charging/discharging execution command.
- the switching element is repeatedly turned on and off in response to the control signal for ripple charging and discharging, and the inverter 3 outputs a ripple current for alternately charging and discharging a plurality of times to the drive battery 1. be.
- step S5 the controller 21 acquires the temperature of the cooling water before heat exchange with the driving battery 1 from the water temperature sensor.
- step S6 controller 21 compares the temperature of drive battery 1 with the temperature of drive battery 1 acquired in step S5 and the temperature of cooling water before heat exchange. It is determined whether or not the temperature of the cooling water is higher than that before replacement. If the controller 21 makes an affirmative determination, the process proceeds to step S7, and if the controller 21 makes a negative determination, the process proceeds to step S9.
- step S7 the controller 21 outputs a control signal for closing the valve A to the valve A, and outputs a control signal for opening the valve B to the valve B.
- the cooling water does not flow to the drive battery 1 because the valve A is closed.
- the valve B since the valve B is opened, cooling water flows through the inverter 3 , the motor 2 , and the vehicle charger 6 .
- the controller 21 ends the processing of the flowchart shown in FIG.
- step S9 the controller 21 outputs to the valve A a control signal for opening the valve A, and outputs a control signal for closing the valve B to the valve B.
- the cooling water flows to the driving battery 1 by opening the valve A.
- the cooling water sent out from the pump A circulates through the cooling water passage 11 in the order of the inverter 3, the motor 2, the vehicle charger 6, the drive battery 1, and the pump A.
- the controller 21 terminates the processing of the flowchart shown in FIG.
- the motor 2 that drives the electric vehicle, the driving battery 1 that can supply power to the motor 2, and the inverter 3 that is provided between the motor 2 and the driving battery 1 are installed.
- the temperature of the drive battery 1 is lower than a predetermined warm-up target threshold
- an execution command for ripple charge/discharge in which charging and discharging are alternately performed multiple times with the drive battery 1, is output to the inverter 3.
- the temperature of the drive battery 1 is higher than the temperature of the coolant that exchanges heat with the drive battery 1 during the ripple charge/discharge, or when the temperature of the drive battery 1 is lower than the temperature of the coolant to reduce the flow rate of the cooling water.
- the temperature of the driving battery 1 can be efficiently raised by the ripple charging/discharging.
- the temperature rise rate of the drive battery 1 is increased, and the input/output power of the drive battery 1 can be quickly increased from the low temperature state.
- the charging time can be shortened by a rapid charging method.
- the power consumption performance of the drive battery 1 can be improved.
- the electric vehicle has a cooling water flow path 11 and valves A and B and a pump A provided in the cooling water flow path 11 .
- the controller 21 controls the opening and closing of the valves A and B so that when the temperature of the driving battery 1 is higher than the temperature of the cooling water that exchanges heat with the driving battery 1 during ripple charge/discharge, the driving The flow rate of the cooling water is reduced compared to when the temperature of the battery 1 is lower than the temperature of the cooling water.
- the temperature of the driving battery 1 can be efficiently raised by ripple charging/discharging by a simple method of controlling the opening and closing of the valve. Further, since it can be realized by installing the valve A and the valve B in the cooling water flow path 11, it is possible to prevent the cooling system 100 from increasing in size.
- the cooling water flow path 11 exchanges heat between the cooling water that exchanges heat with the drive battery 1 , the cooling water that exchanges heat with the inverter 3 , and the motor 2 . It is a flow path through which the cooling water to be used can circulate.
- the controller 21 controls opening and closing of the valves A and B so that the inverter 3 and the cooling water exchange heat and the motor 2 and the cooling water exchange heat during the ripple charge/discharge.
- the heat generated by the motor 2 and the inverter 3 due to the ripple charge/discharge can be released to the cooling water, and the motor 2 and the inverter 3 can be cooled.
- the possibility of failure of the motor 2 and the inverter 3 due to heat can be reduced.
- the controller 21 exchanges heat with the inverter 3 when the temperature of the drive battery 1 is higher than the temperature of the cooling water before heat exchange with the drive battery 1 during the ripple charge/discharge. Opening and closing valves A and B so that either the flow rate of the cooling water or the flow rate of the cooling water that exchanges heat with the motor 2 is greater than the flow rate of the cooling water before heat exchange with the driving battery 1 to control.
- the heat generated by the drive battery 1 can be suppressed or reduced from being released to the cooling water, and the heat generated by the motor 2 and the inverter 3 can be released to the cooling water.
- controller 21 when the temperature of drive battery 1 is lower than the temperature of cooling water before heat exchange with drive battery 1 during ripple charge/discharge, controller 21 reduces the heat generated by inverter 3 to The opening/closing of the valves A and B is controlled so that the cooling water that has received the heat and the cooling water that has received the heat generated from the motor 2 exchange heat with the drive battery 1 .
- the cooling water warmed by the heat generated by the motor 2 and the inverter 3 exchanges heat with the driving battery 1, so that the driving battery 1 can be heated from the outside.
- heating from the outside makes it possible to warm up the driving battery 1 more efficiently.
- the controller 21 circulates the cooling water to The opening and closing of valves A and B are controlled so that heat is exchanged with the device.
- the cooling water heated by the heat generated by the motor 2 and the inverter 3 can be sent to the driving battery 1 in a state where the heat generated by the ripple charging/discharging is not released to the cooling water.
- the controller 21 outputs a ripple charging/discharging execution command while the electric vehicle is stopped by the parking lock mechanism that disables rotation of the output shaft. Even in a state in which the driving force from the motor 2 cannot stop the rotation of the driving wheels due to the ripple charging/discharging, the driving battery 1 can be warmed up.
- FIG. 5 is a schematic configuration diagram of a cooling system 200 according to the second embodiment.
- the configuration of the valves and pumps provided in the cooling water flow path 11 and the flow rate control function of the controller 31 provided in the flow rate control device 30 are the same as the cooling system according to the first embodiment described above. It has the same configuration as the cooling system 100 except that it differs from the system 100 . Therefore, in FIG. 5, the same reference numerals as those shown in FIG. 1 are assigned to the same configurations as those of the cooling system 100, and the descriptions of the configurations similar to those of the cooling system 100 are appropriately referred to. .
- a pump B, a pump C, and valves C to F are provided in the cooling water flow path 11 according to this embodiment.
- the pump B, the pump C, the valves C to F are electrically connected to the flow control device 30 .
- the pumps B and C operate or stop according to control signals from the controller 31 , and the valves C to F open and close according to control signals from the controller 31 .
- the pump B is a water pump for sending cooling water to the cooling water flow path 11 .
- the pump B is provided at a position corresponding to the valve A in the first embodiment.
- cooling water is sent from the pump B to the drive battery 1 .
- the pump B is stopped by the control signal from the controller 31 , no cooling water is sent from the pump B and no cooling water is sent to the driving battery 1 .
- the pump C is a water pump corresponding to the pump A shown in FIG.
- the valve D is provided between the drive battery 1 and the pump C in the coolant flow path 11 . Cooling water is sent to the pump C when the valve C is opened by a control signal from the controller 31 . On the other hand, when the valve D is closed by the control signal from the controller 31, the cooling water is not sent to the pump C.
- the valve E is provided between the vehicle-mounted charger 6 and the chiller 12 in the cooling water flow path 11 . Cooling water is sent to the chiller 12 and the valve F when the valve E is opened by a control signal from the controller 31 . On the other hand, when the valve E is closed by the control signal from the controller 31, cooling water is not sent to the chiller 12 and the valve F.
- the valve F is provided in a branched path between the valve E and the chiller 12 in the cooling water flow path 11 .
- the branch passage provided with the valve F is the valve E and the chiller 12. , and joins the main stream between the driving battery 1 and the valve D.
- the valve G is provided in a branched path between the onboard charger 6 and the valve E in the cooling water flow path 11 .
- the branch path provided with the valve G branches from the main stream between the on-vehicle charger 6 and the valve E, and the valve D and the pump C It is a cooling channel that merges with the main flow between
- the controller 31 controls the operation of the pumps B and C, instead of controlling the opening and closing of the valves A and B by the controller 21 according to the first embodiment, and controls the opening and closing of the valves C to F. to control.
- the controller 31 controls the operation of the pump B and the pump C, and controls the opening and closing of the valves C to F, so that the temperature of the drive battery 1 during ripple charge/discharge is When the temperature is higher than the temperature of the cooling water sent to the drive battery 1, the flow rate of the cooling water to the drive battery 1 is reduced compared to when the temperature of the drive battery 1 is lower than the temperature of the cooling water.
- the controller 31 controls the operation of the pumps B and C, and controls the opening and closing of the valves C to F for the flow rate control function realized by the controller 21 according to the first embodiment. can be done.
- the controller 31 controls the flow rate of cooling water that exchanges heat with the vehicle-mounted charger 6 according to the charging method of the power supply equipment.
- the driving battery 1 is charged by the rapid charging method, the charging of the driving battery 1 is performed from the power supply equipment while the on-vehicle charger 6 is stopped.
- the controller 31 controls the operation of the pump B and the pump C so that the cooling water does not exchange heat with the on-vehicle charger 6 when charging the driving battery 1 from the power supply equipment by the rapid charging method, and also controls the operation of the valve C. to control the opening and closing of the valve F;
- the driving battery 1 is charged by the normal charging method, the driving battery 1 is charged from the power supply equipment while the vehicle-mounted charger 6 is in operation.
- FIG. 6 a cooling water flow rate control method according to the present embodiment will be described with reference to FIGS. 6 and 7.
- FIG. 6(A) is a diagram showing how cooling water does not flow to the driving battery 1 when the driving battery 1 is charged by the normal charging method in the cooling system 200 shown in FIG.
- the controller 31 stops the pump B, operates the pump C, closes the valves D to F, and opens the valve G, as shown in FIG. , the radiator 15, the inverter 3, the motor 2, the vehicle charger 6, and the pump C circulate through the cooling water passage 11 in this order.
- the pump B since the pump B is stopped, the cooling water is not sent to the driving battery 1 and the cooling water does not flow to the driving battery 1 . Cooling water flows through the on-board charger 6 while the on-board charger 6 is operating by charging by the normal charging method.
- FIG. 6B is a diagram showing how cooling water does not flow to the drive battery 1 in the cooling system 200 shown in FIG. 5 when the drive battery 1 is not charged from the power supply equipment.
- the controller 31 stops the pumps B and C and closes the valves D to G, the cooling water does not flow through the cooling water passage 11 as shown in FIG.
- the controller 31 outputs a control signal to the pumps B and C to stop the pumps B and C, and outputs a control signal to the valves D to G to close the valves D-G.
- FIG. 7(A) is a diagram showing how cooling water flows through the driving battery 1 when the driving battery 1 is charged by the normal charging method in the cooling system 200 shown in FIG.
- the controller 31 operates the pumps B and C, closes the valves D, F and G, and opens the valve E.
- the cooling water sent out from the pump B is sent to the drive battery 1 and the pump C.
- cooling water flows through the on-board charger 6 while the on-board charger 6 is operating with charging by the normal charging method.
- the cooling water circulates through the cooling water channel 11 in the order of the inverter 3, the motor 2, the vehicle charger 6, the driving battery 1, and the inverter 3.
- FIG. 7B is a diagram showing how cooling water flows to the driving battery 1 in the cooling system 200 shown in FIG. 5 when the driving battery 1 is not charged from the power supply equipment.
- the controller 31 operates the pump B, stops the pump C, closes the valves D, E, and G, and opens the valve F, the pump B pumps out as shown in FIG. Cooling water circulates through the cooling water flow path 11 through the drive battery 1, the valve F, the chiller 12, and the pump B in this order.
- the controller 31 when the temperature of driving battery 1 is lower than the temperature of cooling water before heat exchange with driving battery 1 during ripple charging/discharging, the controller 31 outputs to the pump B a control signal for operating the pump B, and outputs to the pump C a control signal for stopping the pump C; The controller 31 also outputs a control signal to the valve D, the valve E, and the valve G for closing the valve D, the valve E, and the valve G, and outputs a control signal for opening the valve F to the valve F.
- the vehicle-mounted charger 6 does not operate in charging by the rapid charging method, heat exchange with the vehicle-mounted charger 6 that does not generate heat or does not easily generate heat is prevented, and the motor 2 and the inverter 3 dissipate into the cooling water. You can increase the amount of heat. As a result, the cooling of the motor 2 and the inverter 3 can be accelerated compared to the case where cooling water is supplied to the vehicle-mounted charger 6 .
- the controller 31 when the drive battery 1 is charged from the outside of the electric vehicle by the normal charging method, the controller 31 operates the pumps B and C so that the onboard charger 6 and the cooling water exchange heat. and control the opening and closing of the valves C to F. Even if the vehicle-mounted charger 6 generates heat due to charging by the normal charging method, the vehicle-mounted charger 6 can be cooled.
- a modification of the controller 31 when charging the driving battery 1 by the rapid charging method will also be described.
- the controller 31 When charging of the drive battery 1 from the outside of the electric vehicle is started by the quick charging method, the controller 31 according to the modification outputs a control signal for stopping charging of the drive battery 1 after a predetermined period of time has elapsed. is output to the power supply equipment via a predetermined communication line.
- the controller 31 After the charging of the driving battery 1 by the rapid charging method is stopped, the controller 31 generates a control signal for ripple charging/discharging and outputs it to the inverter 3 .
- the controller 31 stops outputting the control signal for ripple charging/discharging and stops charging the driving battery 1 by the rapid charging method.
- a control signal for restarting is output to the power supply facility.
- the driving battery 1 Under the control of the controller 31 according to the modification, the driving battery 1 is subjected to ripple charge/discharge after rapid charging, and then resumes rapid charging. Since the driving battery 1 generates heat due to rapid charging and ripple charging/discharging, the amount of heat generated can be increased compared to the case where only rapid charging is performed without intervening ripple charging/discharging between rapid charging. As a result, more efficient warm-up of the driving battery 1 can be achieved.
- an electric vehicle is used as an example of an electric vehicle, but the flow control method, flow control device, and cooling system according to the present invention can also be applied to other electric vehicles.
- an electric vehicle is a so-called series hybrid vehicle equipped with an engine as a generator, a generator motor, and a motor that generates driving force for driving the electric vehicle with electric power from the generator or the drive battery.
- the electric vehicle may be a so-called series-parallel vehicle.
- cooling water was used as an example of a heat medium that exchanges heat with an object to be cooled.
- the cooling system according to the present invention has a refrigerant gas channel as a refrigerant gas passage instead of the cooling water channel. Even if it is a refrigerant gas, it is possible to obtain the same effect as in the case of cooling water.
- a heat medium according to the present invention includes cooling water or refrigerant gas.
- cooling water is supplied to driving battery 1.
- the configuration that does not flow has been described as an example, it is not limited to this.
- the cooling water flowing through driving battery It should be less than the case where the temperature is lower than the temperature of the cooling water before heat exchange with the battery 1 .
- the cooling system 100 shown in FIG. This makes it possible to obtain the same effects as those of the above-described embodiment.
- a control signal for ripple charging/discharging may be generated based on a conventionally known method, ie, a comparison of the same carrier wave with no phase difference and an AC voltage command value.
- the parking lock mechanism was described as an example of the mechanism that disables the rotation of the output shaft, but a conventionally known parking brake mechanism or foot brake mechanism may be used. Alternatively, a plurality of these mechanisms may be used in combination.
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Abstract
Description
本出願は、2021年12月17日に出願された日本国特許出願の特願2021-205477に基づく優先権を主張するものであり、文献の参照による組み込みが認められる指定国については、上記の出願に記載された内容を参照により本出願に組み込み、本出願の記載の一部とする。
図1は、第1実施形態に係る冷却システム100の構成概略図である。本実施形態に係る冷却システム100は、電動車両に搭載され、後述する駆動用バッテリ1、モータ2、インバータ3及び車載充電器6を冷却するためのシステムである。本実施形態では、電動車両として、ガソリンエンジンやディーゼルエンジン等の内燃機関を持たず、駆動用バッテリ1と、駆動用バッテリ1の電力を変換するインバータ3と、インバータ3から出力された電力によって電動車両を駆動させる駆動力を発生するモータ2と、を搭載したいわゆる電気自動車(EV:Electric Vehicle)を例に挙げて説明する。
図5は、第2実施形態に係る冷却システム200の構成概略図である。本実施形態に係る冷却システム200は、冷却水用流路11に設けられたバルブ及びポンプの構成と、流量制御装置30が備えるコントローラ31の流量制御機能が、上述した第1実施形態に係る冷却システム100と異なる以外は、冷却システム100と同様の構成である。このため、図5では、冷却システム100と同様の構成には、図1に示す符号と同様の符号を付し、冷却システム100と同様の構成の説明については、既述の説明を適宜援用する。
2…モータ
3…インバータ
4…DCDCコンバータ
5…補機用バッテリ
6…車載充電器
11…冷却水用流路
12…チラー
13…コンプレッサ
14…コンデンサ
15…ラジエータ
20…流量制御装置
21…コントローラ
100…冷却システム
Claims (14)
- 車両を駆動させるモータと、前記モータに電力供給可能なバッテリと、前記モータと前記バッテリの間に設けられた電力変換装置を搭載する車両のコントローラにより実行され、前記バッテリとの間で熱交換を行う熱媒体の流量を制御する流量制御方法であって、
前記バッテリの温度が所定の閾値温度よりも低い場合、前記バッテリとの間で充電と放電を交互に複数回行うリプル充放電の実行指令を、前記電力変換装置に出力し、
前記リプル充放電の実行中、前記バッテリの温度が前記バッテリとの間で熱交換を行う熱媒体の温度よりも高い場合、前記バッテリの温度が前記熱媒体の温度よりも低い場合に比べて、前記熱媒体の流量を減らす流量制御方法。 - 請求項1に記載の流量制御方法であって、
前記車両は、前記熱媒体が循環可能な流路と、前記流路に設けられたバルブ及びポンプを有し、
前記バルブ及び前記ポンプのうち少なくとも何れか一方の動作を制御することで、前記リプル充放電の実行中、前記バッテリの温度が前記熱媒体の温度よりも高い場合、前記バッテリの温度が前記熱媒体の温度よりも低い場合に比べて、前記熱媒体の流量を減らす流量制御方法。 - 請求項2に記載の流量制御方法であって、
前記熱媒体は、第1熱媒体であり、
前記流路は、前記第1熱媒体と、前記電力変換装置との間で熱交換を行う第2熱媒体と、前記モータとの間で熱交換を行う第3熱媒体が循環可能な流路であり、
前記リプル充放電の実行中、前記電力変換装置と前記第2熱媒体が熱交換を行い、前記モータと前記第3熱媒体が熱交換を行うように、前記バルブ及び前記ポンプのうち少なくとも何れか一方の動作を制御する流量制御方法。 - 請求項3に記載の流量制御方法であって、
前記バッテリの温度が前記第1熱媒体の温度よりも高い場合、前記第2熱媒体の流量及び前記第3熱媒体の流量のいずれかの流量、又は、前記第2熱媒体の流量と前記第3熱媒体の流量の合算値が前記第1熱媒体の流量よりも増えるように、前記バルブ及び前記ポンプのうち少なくとも何れか一方の動作を制御する流量制御方法。 - 請求項3又は4に記載の流量制御方法であって、
前記バッテリの温度が前記第1熱媒体の温度よりも低い場合、前記電力変換装置から発生する熱を受けた前記第2熱媒体、及び前記モータから発生する熱を受けた前記第3熱媒体が前記バッテリとの間で熱交換を行うように、前記バルブ及び前記ポンプのうち少なくとも何れか一方の動作を制御する流量制御方法。 - 請求項5に記載の流量制御方法であって、
前記バッテリの温度が前記第1熱媒体の温度よりも低い場合、前記第1熱媒体、前記第2熱媒体、及び前記第3熱媒体が前記流路を循環するように、前記バルブ及び前記ポンプのうち少なくとも何れか一方の動作を制御する流量制御方法。 - 請求項3~6の何れかに記載の流量制御方法であって、
前記車両は、普通充電方式により前記車両の外部から前記バッテリを充電するための車載充電器と、前記車載充電器との間で熱交換を行う第4熱媒体を有し、
前記流路は、前記第1熱媒体、前記第2熱媒体、前記第3熱媒体、及び前記第4熱媒体が循環可能な流路であり、
急速充電方式により前記車両の外部から前記バッテリを充電する場合、前記車載充電器と前記第4熱媒体が熱交換を行わないように、前記バルブ及び前記ポンプのうち少なくとも何れか一方の動作を制御する流量制御方法。 - 請求項7に記載の流量制御方法であって、
前記普通充電方式により前記車両の外部から前記バッテリを充電する場合、前記車載充電器と前記第4熱媒体が熱交換するように、前記バルブ及び前記ポンプのうち少なくとも何れか一方の動作を制御する流量制御方法。 - 請求項7に記載の流量制御方法であって、
前記急速充電方式による前記バッテリへの充電が停止した後、前記リプル充放電の実行指令を前記電力変換装置に出力し、
前記リプル充放電の停止後、前記急速充電方式による前記バッテリへの充電制御を再開させる流量制御方法。 - 請求項1~9の何れかに記載の流量制御方法であって、
出力軸を回転不能にする機構により前記車両を停車させた状態で、前記リプル充放電の実行指令を出力する流量制御方法。 - 請求項10に記載の流量制御方法であって、
前記出力軸を回転不能にする前記機構は、パークロック機構、パーキングブレーキ機構、フットブレーキ機構のいずれかを含む流量制御方法。 - 請求項1~11の何れかに記載の流量制御方法であって、
前記熱媒体は、冷却水又は冷媒ガスを含む流量制御方法。 - 車両を駆動させるモータと、前記モータに電力供給可能なバッテリと、前記モータと前記バッテリの間に設けられた電力変換装置を搭載する車両のコントローラを備え、
前記コントローラは、
前記バッテリの温度が所定の閾値温度よりも低い場合、前記バッテリとの間で充電と放電を交互に複数回行うリプル充放電の実行指令を、前記電力変換装置に出力し、
前記リプル充放電の実行中、前記バッテリの温度が前記バッテリとの間で熱交換を行う熱媒体の温度よりも高い場合、前記バッテリの温度が前記熱媒体の温度よりも低い場合に比べて、前記熱媒体の流量が減るように、前記熱媒体の流量を制御する流量制御装置。 - 請求項13に記載の流量制御装置と、前記モータと、前記バッテリと、前記電力変換装置と、前記熱媒体が循環可能な流路とを含む冷却システム。
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