Vehicle control device

Abstract

To provide a vehicular control unit which can avoid my room mode from stopping.SOLUTION: A vehicular electronic control unit (ECU) 50 for a vehicle 10 comprises: a low temperature-side cooling water circuit 20 which cools a boosting converter 12 and a battery 11 and is cooled by a chiller 24 and a low temperature-side radiator 25; a refrigeration cycle circuit 30 which adsorbs, by the chiller 24, heat from the low temperature-side cooling water circuit 20; and a high temperature-side cooling water circuit 40 which is cooled by a high temperature-side radiator 44. Therein: the low temperature-side radiator 25 is disposed in the vicinity of the high temperature-side radiator 44; my room mode can be set which drives an auxiliary machinery during charging the battery 11 by a power supply facility; and a number of revolution of a compressor 31 is reduced according to temperature of low temperature-side cooling water if the temperature in the low temperature-side cooling water is prescribed temperature or more when the my room mode is set.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle control device capable of setting a my room mode. [Background technology]

[0002] Among electric vehicles, BEVs (Battery Electric Vehicles) and PHEVs (Plug-in Hybrid Electric Vehicles) have a battery for driving that can be charged by a power supply facility. In these vehicles, a "My Room" mode can be set in which auxiliary equipment such as an air conditioner, audio equipment, and navigation system can be operated while the battery is charging (see, for example, Patent Document 1). The "My Room" mode allows the interior of the vehicle to be used for teleworking or to wait comfortably inside the vehicle while the battery is charging. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-054206 Summary of the Invention [Problem to be solved by the invention]

[0004] When the above-described My Room mode is set, the battery power supply voltage is stepped up or down by the step-up / step-down converter and used as a drive voltage for the accessories. The step-up / step-down converter and the battery are cooled by the low-temperature side coolant circuit. Meanwhile, the low-temperature side coolant circuit absorbs heat from the refrigeration cycle circuit and is cooled by the low-temperature side radiator. The refrigeration cycle circuit absorbs heat from the low-temperature side coolant circuit and dissipates heat to the high-temperature side coolant circuit. The high-temperature side coolant circuit is cooled by the high-temperature side radiator.

[0005] If a low-temperature side radiator is located near the high-temperature side radiator, the heat dissipated by the high-temperature side radiator may cause the temperature of the low-temperature side coolant cooled in the low-temperature side radiator to rise. If the temperature of the low-temperature side coolant rises, it becomes difficult for the low-temperature side coolant to cool the step-up / step-down converter, so the My Room mode is stopped.

[0006] When the My Room mode is set while the battery is being charged by the power supply equipment, heat from the battery is dissipated to the high-temperature side radiator via the low-temperature side coolant circuit, the refrigeration cycle circuit, and the high-temperature side coolant circuit. However, if the low-temperature side radiator is located near the high-temperature side radiator, the heat dissipated from the high-temperature side radiator may cause the temperature of the low-temperature side coolant cooled in the low-temperature side radiator to rise, which may cause the My Room mode to stop.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle control device that can prevent the my room mode from being stopped. [Means for solving the problem]

[0008] The vehicle control device of the present invention is a vehicle control device for a vehicle that includes a driving battery that can be charged by a power supply equipment, a step-up / step-down converter that increases or decreases the battery voltage to drive accessories while the battery is being charged by the power supply equipment, a low-temperature side coolant circuit that cools the step-up / step-down converter and the battery and is cooled by a chiller and a low-temperature side radiator, a refrigeration cycle circuit that absorbs heat from the low-temperature side coolant circuit by the chiller and has a compressor and a water-cooled condenser, and a high-temperature side coolant circuit that is heated by the water-cooled condenser and cooled by the high-temperature side radiator, and in which the low-temperature side radiator is located near the high-temperature side radiator, and is characterized in that a my-room mode can be set to drive accessories while the battery is being charged by the power supply equipment, and when the my-room mode is set, if the temperature of the low-temperature side coolant is above a predetermined temperature, the compressor rotation speed is reduced according to the temperature of the low-temperature side coolant. [Effects of the Invention]

[0009] According to the vehicle cooling system of the present invention, it is possible to prevent the my room mode from being stopped. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing a vehicle according to an embodiment; [Figure 2] 1 is a block diagram showing a configuration of a vehicle control device according to an embodiment; [Figure 3] FIG. 4 is a flowchart showing a flow of compressor rotation speed reduction control. DETAILED DESCRIPTION OF THE INVENTION

[0011] An example of an embodiment of the present invention will be described in detail below. In the following description, specific shapes, materials, directions, numerical values, etc. are examples for facilitating understanding of the present invention, and can be appropriately changed according to the application, purpose, specifications, etc.

[0012] A vehicle ECU (Electronic Control Unit) 50 serving as a vehicle control device can set a "My Room" mode in which auxiliary devices such as an air conditioner, audio equipment, and navigation system can be driven while the battery 11 is being charged by a power supply facility (not shown). The vehicle ECU 50 can prevent the "My Room" mode from being stopped, as will be described in detail later.

[0013] <Vehicle> A vehicle 10 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG.

[0014] The vehicle 10 is a BEV that runs by driving a motor (not shown) using only the power of the battery 11. However, the vehicle 10 of this embodiment may also be a PHEV that runs by driving a gasoline engine and a motor and whose battery 11 can be charged from a power supply facility.

[0015] As shown in FIG. 1, vehicle 10 includes battery 11 for driving as described above, a step-up / step-down converter 12 that steps up or down the power supply voltage of battery 11, a cooling system 15 that cools battery 11 and step-up / step-down converter 12, and vehicle ECU 50 that controls each device of cooling system 15 and can set the above-described my room mode.

[0016] <Cooling system> The cooling system 15 has a low-temperature side coolant circuit 20 that cools the battery 11 and the boost / buck converter 12, a refrigeration cycle circuit 30 that absorbs heat from the low-temperature side coolant circuit 20, and a high-temperature side coolant circuit 40 that dissipates heat from the refrigeration cycle circuit 30.

[0017] The low-temperature side cooling water circuit 20 is a circuit that is cooled by circulating low-temperature cooling water using a low-temperature side water pump 21, cooling the battery 11 using a battery cooler 22, cooling the step-up / step-down converter 12 using a converter cooler 23, absorbing heat into the refrigeration cycle circuit 30 using a chiller 24, and dissipating heat into the air using a low-temperature side radiator 25.

[0018] In the low-temperature side coolant circuit 20, a battery cooler 22, a converter cooler 23, a chiller 24, and a low-temperature side radiator 25 are arranged in parallel. A five-way valve 26 connects the path leading to the battery cooler 22, the path leading to the converter cooler 23, the path leading to the chiller 24, the path leading to the low-temperature side radiator 25, and a short-circuit path (a path with no path).

[0019] In the low-temperature side coolant circuit 20, a low-temperature side coolant temperature sensor 61 is provided upstream of the converter cooler .

[0020] In the low-temperature side coolant circuit 20, the lubricating oil of the transaxle may be cooled by the path leading to the converter cooler 23. Also, the path leading to the converter cooler 23 may cool a PCU (Power Control Unit).

[0021] The refrigeration cycle circuit 30 has a compressor 31 that compresses the refrigerant, a water-cooled condenser 32 that heats (wastes heat from) the coolant circulating through the high-temperature side coolant circuit 40, an evaporator 33 that cools the air to be blown into the vehicle cabin, an evaporator-side expansion valve 34 that adjusts the amount of refrigerant circulating to the evaporator 33, a chiller 24 that absorbs heat from the coolant circulating through the low-temperature side coolant circuit 20, and a chiller-side expansion valve 36 that adjusts the amount of refrigerant circulating to the chiller 24. In the refrigeration cycle circuit 30, the evaporator 33 and the chiller 24 are connected in parallel.

[0022] The high-temperature side coolant circuit 40 is a circuit in which the high-temperature side coolant is circulated by a high-temperature side water pump 41 to cool the water-cooled condenser 32, is heated by an electric heater 42 to heat a heater core 43 that heats the air to be blown into the vehicle cabin, and is cooled by the heat being dissipated into the air by a high-temperature side radiator 44.

[0023] In the high-temperature side coolant circuit 40, the water-cooled condenser 32, the electric heater 42, the heater core 43, and the high-temperature side radiator 44 are arranged in parallel. The path leading to the water-cooled condenser 32 and the electric heater 42, the path leading to the heater core 43, and the path leading to the high-temperature side radiator 44 are connected by a three-way flow control valve 45.

[0024] In the cooling system 15 of this embodiment, the high-temperature side radiator 44 of the high-temperature side coolant circuit 40 is disposed near the low-temperature side radiator 25 of the low-temperature side coolant circuit 20. Therefore, as will be described in detail later, the temperature of the low-temperature side coolant may rise.

[0025] The vehicle ECU 50 controls each device of the cooling system 15 and sets the above-mentioned my room mode. The vehicle ECU 50 also executes compressor rotation speed reduction control, which will be described in detail later. The vehicle ECU 50 is a computer that includes a processor 51 having a CPU that performs information processing therein, and a memory 52 that stores software, programs, or data executed by the processor 51.

[0026] The vehicle ECU 50 is connected to the low-temperature side water pump 21 and five-way valve 26 of the low-temperature side coolant circuit 20, the compressor 31, evaporator side expansion valve 34 and chiller side expansion valve 36 of the refrigeration cycle circuit 30, and the high-temperature side water pump 41, electric heater 42 and three-way flow control valve 45 of the high-temperature side coolant circuit 40.

[0027] The vehicle ECU 50 is also connected to the low-temperature side coolant temperature sensor 61 and a my-room mode button 62 for setting the my-room mode. The my-room mode button 62 is provided near the driver's seat inside the vehicle cabin.

[0028] The vehicle ECU 50 has a my room mode setting unit 53, a low temperature side coolant temperature acquisition unit 54, and a compressor rotation speed reduction unit 55, each of which will be described in detail later. The my room mode setting unit 53, the low temperature side coolant temperature acquisition unit 54, and the compressor rotation speed reduction unit 55 are realized by the processor 51 executing programs stored in the memory 52.

[0029] When the user presses the my room mode button 62 while the battery 11 is being charged by the power supply device, the my room mode setting unit 53 sets the my room mode in which auxiliary devices such as an air conditioner, an audio device, and a navigation device can be driven.

[0030] As described above, in cooling system 15, low-temperature side radiator 25 is disposed near high-temperature side radiator 44, and therefore the temperature of the low-temperature side coolant cooled by low-temperature side radiator 25 may rise due to heat dissipation from high-temperature side radiator 44. When the temperature of the low-temperature side coolant rises, it becomes difficult for the low-temperature side coolant to cool down step-up / step-down converter 12, so the My Room mode is stopped.

[0031] Therefore, the low-temperature side coolant temperature acquisition unit 54 and the compressor rotation speed reduction unit 55 described below prevent the my room mode from being stopped.

[0032] The low-temperature side coolant temperature acquisition unit 54 acquires the coolant temperature of the low-temperature side coolant circulating through the low-temperature side coolant circuit 20 using the low-temperature side coolant temperature sensor 61 .

[0033] If the coolant temperature acquired by the low-temperature-side coolant temperature acquisition unit 54 is equal to or higher than a predetermined temperature, the compressor rotation speed reduction unit 55 reduces the rotation speed of the compressor 31 in accordance with the level of the coolant temperature. The coolant temperature and the amount of reduction in the rotation speed of the compressor 31 are stored in advance in the memory 52.

[0034] The compressor rotation speed reduction unit 55 reduces the rotation speed of the compressor 31, thereby reducing the amount of waste heat from the water-cooled condenser 32 and the amount of heat radiation from the high-temperature side radiator 44. This prevents the temperature of the low-temperature side coolant cooled in the low-temperature side radiator 25 from increasing due to the heat radiation from the high-temperature side radiator 44, and prevents the my room mode from being stopped.

[0035] <Compressor rotation speed reduction control> The compressor rotation speed reduction control will be described with reference to FIG.

[0036] In step S11, it is determined whether or not the battery 11 is being charged. If the battery 11 is being charged, the process proceeds to step S12. If the battery 11 is not being charged, the process proceeds to step S15.

[0037] In step S12, it is determined whether or not the my room mode has been set by the my room mode setting unit 53. If the my room mode has been set, the process proceeds to step S13. If the my room mode has not been set, the process proceeds to step S15.

[0038] In step S13, the low-temperature side coolant temperature acquisition unit 54 acquires the coolant temperature of the low-temperature side coolant circulating through the low-temperature side coolant circuit 20.

[0039] In step S14, if the coolant temperature acquired by the low-temperature side coolant temperature acquisition unit 54 is equal to or higher than a predetermined temperature, the rotation speed of the compressor 31 is reduced according to the level of the coolant temperature. In step S15, the rotation speed of the compressor 31 is normally controlled.

[0040] It should be noted that the present invention is not limited to the above-described embodiment and its modifications, and various changes and modifications are possible within the scope of the claims of this application. [Explanation of symbols]

[0041] 10 vehicle, 11 battery, 12 boost / buck converter, 15 cooling system, 20 low-temperature side coolant circuit, 21 low-temperature side water pump, 22 battery cooler, 23 converter cooler, 24 chiller, 25 low-temperature side radiator, 26 five-way valve, 30 refrigeration cycle circuit, 31 compressor, 32 water-cooled condenser, 33 evaporator, 34 evaporator side expansion valve, 35 chiller, 36 chiller side expansion valve, 40 high-temperature side coolant circuit, 41 high-temperature side water pump, 42 electric heater, 43 heater core, 44 high-temperature side radiator, 45 three-way flow control valve, 50 vehicle ECU (vehicle control device), 51 processor, 52 memory, 53 my room mode setting unit, 54 low-temperature side coolant temperature acquisition unit, 55 compressor rotation speed reduction unit, 61 low-temperature side coolant temperature sensor, 62 My Room Mode Button

Claims

[Claim 1] a battery for driving that can be charged by a power supply facility; a step-up / step-down converter that increases or decreases the voltage of the battery in order to drive an auxiliary device while the battery is being charged by the power supply equipment; a low-temperature side coolant circuit that cools the step-up / step-down converter and the battery and is cooled by a chiller and a low-temperature side radiator; a refrigeration cycle circuit that absorbs heat from the low-temperature side cooling water circuit by the chiller and has a compressor and a water-cooled condenser; a high-temperature side coolant circuit that is heated by the water-cooled condenser and cooled by a high-temperature side radiator; Equipped with A vehicle control device for a vehicle in which the low-temperature side radiator is disposed near the high-temperature side radiator, a My Room mode can be set to drive the auxiliary machinery while the battery is being charged by the power supply equipment, When the my room mode is set, if the low-temperature side cooling water is at or above a predetermined temperature, the rotation speed of the compressor is reduced in accordance with the temperature of the low-temperature side cooling water. Vehicle control device.

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