JP2016013729A - Vehicle air-conditioning controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle air-conditioning controller capable of preventing the reduction of fuel economy and the degradation of battery management due to the driving of a compressor to exceed necessary cooling performance during engine stop.SOLUTION: Control means (40) includes cooling-performance-fall determination means (47) determining whether a cooling performance in a cabin (4) falls; and electric motor driving means (48) driving an electric motor (32) if the cooling-performance-fall determination means (48) determines that the cooling performance in the cabin (4) falls when an engine automatic stop condition is satisfied and an engine is automatically stopped.

Description

  The present invention relates to an air conditioning control device for a vehicle, and more particularly to an air conditioning control device for a vehicle that prevents a decrease in cooling performance due to an automatic engine stop.

The vehicle is provided with an air conditioning control device in order to maintain the temperature in the passenger compartment comfortably.
Some air conditioning control devices include a compressor that compresses refrigerant, an evaporator that cools air blown into the passenger compartment, and an electric motor that drives the compressor.
Examples of such vehicle air conditioning control devices include the following prior art documents.

JP 2012-11847 A

  The vehicle air conditioner according to Patent Document 1 controls the discharge capacity of the compressor and the rotational speed of the electric motor that drives the compressor in order to maintain the cooling performance when the engine shifts from the drive state to the stop state. is there.

However, the engine automatic stop means for automatically stopping the engine when a preset engine automatic stop condition is satisfied, and the engine automatic restart for automatically restarting the engine when a preset engine automatic restart condition is satisfied. In a vehicle equipped with a control means provided with a means, that is, a vehicle equipped with a so-called idle stop function, the compressor is stopped during the automatic engine stop, so that there is a problem that the cooling performance is deteriorated.
Further, in Patent Document 1 described above, since the compressor is driven even when it is not necessary to improve the cooling performance due to a decrease in cooling performance, the compressor is driven more than necessary. There was a risk of deterioration.

  Therefore, the present invention provides an air conditioning system for a vehicle equipped with an idle stop function, which can prevent a reduction in fuel consumption and a deterioration in battery management caused by driving a compressor exceeding the required cooling performance while the engine is stopped. An object is to provide a control device.

  The present invention includes an engine automatic stop means for automatically stopping an engine when a preset engine automatic stop condition is satisfied, and an engine for automatically restarting the engine when a preset engine automatic restart condition is satisfied. In a vehicle air conditioning control device having a control means provided with an automatic restart means, the compressor is driven by a compressor that compresses the refrigerant, an evaporator that cools the air blown into the passenger compartment, and power supplied from the storage battery. An electric motor that drives the compressor, and the control means determines whether or not the cooling performance of the passenger compartment is deteriorated, and cooling performance deterioration determining means; and the engine automatic stop condition is satisfied and the engine When the vehicle is automatically stopped, it is determined that the cooling performance of the vehicle interior is deteriorated by the cooling performance deterioration determining means. The case, characterized in that it comprises an electric motor driving means for driving the electric motor.

  The present invention can prevent a reduction in fuel consumption and a deterioration in battery management caused by driving a compressor exceeding the required cooling performance while the engine is stopped in a vehicle equipped with an idle stop function.

FIG. 1 is a system configuration diagram of an air conditioning control device. (Example) FIG. 2 is a control block diagram of the air conditioning control device. (Example) FIG. 3 is a flowchart of air conditioning control. (Example) FIG. 4A shows a normal driving state. FIG. 4B is a diagram showing that the idle stop is stopped. FIG. 4C is a diagram showing the cooling stop driving during the idle stop. (Example) FIG. 5 is a table for calculating the target temperature of the evaporator. (Example) FIG. 6 is a diagram showing a drive permission state (ON / OFF) of the electric motor according to an engine side (powertrain side) request. (Example) FIG. 7 shows the motor drive state (ON / OFF), the motor side electromagnetic clutch drive state (ON / OFF), the compressor side electromagnetic clutch drive state (ON / OFF), and the engine side electromagnetic clutch drive state (ON / OFF). FIG. (Example)

  In the vehicle equipped with the idling stop function, the engine automatically stops for the purpose of preventing the deterioration of the fuel consumption and the deterioration of battery management by driving the compressor exceeding the required cooling performance while the engine is stopped. When it is determined that the cooling performance in the passenger compartment is deteriorated, the electric motor is driven and realized.

1 to 7 show an embodiment of the present invention.
As shown in FIG. 1, an idle stop vehicle (hereinafter referred to as “vehicle”) 1 is equipped with an engine 2, a storage battery (battery) 3, and an air conditioning control device 5 that performs air conditioning in the passenger compartment 4.
The air conditioning control device 5 includes an air conditioning unit (HVAC) 6.
The air conditioning unit 6 performs air conditioning by blowing air into the passenger compartment 4, and includes a passage forming body 8 that forms an air circulation passage 7.

  The passage forming body 8 has an upstream / inside air oscillating inward so as to switch between an outside air inlet 10 connected to the outside air introduction duct 9 and an inside air inlet 12 connected to the inside air introduction duct 11 at one end on the upstream side. There is provided a switching damper 13 and a suction port changing means (suction port actuator) 14 for operating the inside / outside air switching damper 13 to switch the air suction port to outside air introduction or inside air circulation.

In addition, the passage forming body 8 swings inward so as to switch between the defroster outlet 16 connected to the defroster duct 15 and the vent outlet 18 connected to the vent duct 17 at the other end on the downstream side. One air outlet switching damper 19, first mode changing means (first mode actuator) 20 for operating the first air outlet switching damper 19, and a foot air outlet 22 connected to the foot duct 21 are opened and closed. A second outlet switching damper 23 that swings inward is provided, and second mode changing means (second mode actuator) 24 that operates the second outlet switching damper 23 is provided.
The 1st mode change means 20 and the 2nd mode change means 24 adjust a blower outlet.

Further, in the passage forming body 8, a blower fan 25 for blowing air into the vehicle compartment 4 immediately downstream of the inside / outside air switching damper 13, and blown into the vehicle compartment 4 downstream of the blower fan 25. An evaporator 26 for cooling the air to be cooled, a heater core 27 for raising the temperature of air blown into the passenger compartment 4 on the downstream side of the evaporator 26, and a part of the air blown into the passenger compartment 4 An air mix door 28 that swings to flow into the heater core 27, and an air mix door opening change that changes the opening of the air mix door 28 (the air mix door opening: the rate at which the blown air passes through the heater core 27). Means (air mix door actuator) 29 are provided.
The blower fan 25 includes a fan motor 30 and supplies cooled air into the passenger compartment 4 and adjusts the amount of blown air.
The heater core 27 is driven to heat the interior of the vehicle compartment 4.
The air mix door opening changing means 29 adjusts the temperature inside.

As shown in FIG. 1, the air conditioning control device 5 includes a compressor 31 that compresses the refrigerant, and an electric motor 32 that is driven by the power supplied from the storage battery 3 to drive the compressor 31.
An engine-side pulley 34 is connected to the engine 2 via an engine-side electromagnetic clutch 33. A compressor side pulley 36 is connected to the compressor 31 via a compressor side electromagnetic clutch 35. . A motor side pulley 38 is connected to the motor 32 via a motor side electromagnetic clutch 37.
A driving belt 39 that transmits driving force is wound around the engine side pulley 34, the compressor side pulley 36, and the motor side pulley 38 between the engine 2, the compressor 31, and the motor 32.
The engine-side electromagnetic clutch 33, the compressor-side electromagnetic clutch 35, and the motor-side electromagnetic clutch 37 are engaged (turned on) only when driving force is transmitted.

The air conditioning control device 5 is provided with a control means (control controller) 40.
The control means 40 is connected to the engine 2, the fan motor 30 of the blower fan 25, and the electric motor 32.
Further, the control means 40 includes an evaporator temperature sensor 41 which is an evaporator temperature detection means arranged in the passage forming body 8 and detects the temperature of the evaporator 26, and a battery voltage sensor 42 which detects the voltage of the storage battery 3 as a battery voltage. The outside air temperature sensor 43 that detects the outside air temperature and the occupant setting panel 44 that sets the occupant state are connected.
The control means 40 is connected to the inlet changing means 14, the first mode changing means 20, the second mode changing means 24, and the air mix door opening changing means 29.

As shown in FIG. 2, the control means 40 includes an engine automatic stop means 45 for automatically stopping the engine when a preset engine automatic stop condition is satisfied, and a preset engine automatic restart condition. And an engine automatic restarting means 46 for automatically restarting the engine 2.
In addition, the control means 40 includes a cooling performance reduction determination means 47 that determines whether or not the cooling performance in the passenger compartment 4 is reduced, and when the engine automatic stop condition is satisfied and the engine 2 is automatically stopped, An electric motor drive means 48 for driving the electric motor 32 is provided when the cooling performance deterioration determining means 47 determines that the cooling performance in the passenger compartment 4 is deteriorated.
Furthermore, the control means 40 includes target temperature calculation means 49 for calculating the target temperature of the evaporator 26 from the target temperature in the passenger compartment 4 and the outside air temperature.
Further, the cooling performance deterioration determining means 47 described above is used when the difference between the temperature of the evaporator 26 detected by the evaporator temperature sensor 41 and the target temperature of the evaporator 26 calculated by the target temperature calculating means 49 exceeds a predetermined value. It is determined that the cooling performance in the passenger compartment 4 is degraded.

Next, air conditioning control in this embodiment will be described with reference to the flowchart of FIG.
As shown in FIG. 3, when the engine 2 is in operation and the program of the control means 40 starts (step A01), the target temperature calculation means 49 first calculates the target temperature of the evaporator 26 (step A02).
Then, the engine automatic stop means 45 determines whether or not the engine automatic stop condition is satisfied (step A03).
If this step A03 is YES and the engine automatic stop condition is satisfied, the cooling performance deterioration determining means 47 takes in the temperature of the evaporator 26 detected by the evaporator temperature sensor 41 (step A04).
Then, the cooling performance deterioration determining means 47 determines whether or not the difference between the temperature of the evaporator 26 (evaporator temperature) and the target temperature exceeds a predetermined value (evaporator temperature−target temperature> predetermined value) (step A05).
When this step A05 is YES, the cooling performance fall determination means 47 judges with the cooling performance fall (step A06).
Then, the electric motor driving means 48 drives the electric motor 32 (step A07).
After step A07, if step A03 is NO, or if step A05 is NO, control means 40 returns this program (step A08).

FIG. 4 shows driving states of the engine 2, the compressor 31, and the electric motor 32.
FIG. 4A shows the case of the normal drive state. In this normal drive state, the engine 32 is driven and the electric motor 32 is driven to generate power, and the compressor 31 is driven to perform cooling operation, and the electromagnetic clutches 33, 35, and 37 are engaged. is there.
FIG. 4B shows a case where the idle stop is stopped. When the idle stop is stopped, the engine 2 is stopped, the electric motor 32 is stopped, the compressor 31 is stopped, and the electromagnetic clutches 33, 35, and 37 depend on the state at that time.
FIG. 4C shows a case in which the engine is idling stop and is in cooling operation. In the case of idling stop and cooling driving, the engine 2 is stopped, the electric motor 32 is driven, the compressor 31 is driven, and the compressor side electromagnetic clutch 35 and the electric motor as a compressor other than the engine side electromagnetic clutch 33 are driven. The side electromagnetic clutch 37 is being engaged.

FIG. 5 shows a table for calculating the target temperature of the evaporator 26.
In the calculation of the target temperature of the evaporator 26, the target temperature of the evaporator 26 as a required cooling source is calculated under the vehicle environment such as the vehicle interior temperature, the outside air temperature, and the user set temperature. This calculation method of the target temperature is an example, and a calculation method such as calculation from the target blow-out temperature is not necessary. Further, the calculation of the target temperature of the evaporator 26 is generally used in automatic air conditioning control (AUTO A / C), and therefore description of other calculation methods is omitted. The set temperature can be replaced with the target blowing temperature calculated in the automatic air conditioning control.

FIG. 6 shows the drive permission state (ON / OFF) of the electric motor 32 according to the engine side (powertrain side) request.
When the drive permission state (ON / OFF) of the electric motor 32 according to the engine side request, when the battery voltage decreases, or when the electric motor 32 cannot be driven by other functions, the engine drive permission determination according to the engine side request is set to OFF. To do. Since the conditions that cannot be driven by other functions differ depending on the system, the description is omitted.

In FIG. 7, the drive state (ON / OFF) of the motor 32, the drive state (ON / OFF) of the motor side electromagnetic clutch 37, the drive state (ON / OFF) of the compressor side electromagnetic clutch 35, and the engine side electromagnetic clutch 33 are shown. Indicates the driving state (ON / OFF).
In this case, the electric motor 32 is driven using the drive permission of the electric motor 32 and the cooling performance improvement request according to the engine side request. When the electric motor 32 is driven by such control, the engine-side electromagnetic clutch 33 is not engaged (OFF), and the engine 2 is not driven. In addition, when it determines with the drive stop of the electric motor 32 by an engine side request | requirement, the drive of the electric motor 32 is not implemented as a system request.

As a result, in this embodiment, the control means 40 has the cooling performance deterioration determining means 47 for determining whether or not the cooling performance in the passenger compartment 4 has deteriorated, and the engine automatic stop condition is established and the engine 2 is The motor drive means 48 for driving the motor 32 is provided when the cooling performance deterioration determining means 47 determines that the cooling performance in the passenger compartment 4 is deteriorated when the automatic stop is performed.
With such a structure, it is possible to prevent the compressor 31 from being driven beyond the required cooling performance, and to prevent a decrease in fuel consumption and a decrease in battery management.
Further, the control means 40 includes target temperature calculation means 49 for calculating the target temperature of the evaporator 26 from the target temperature in the passenger compartment 4 and the outside air temperature. When the difference between the target temperature of the evaporator 26 calculated by the target temperature calculation means 49 and the temperature of the evaporator 26 detected by the evaporator temperature detection means 41 exceeds a predetermined value, the cooling performance degradation determination means 47 It is determined that the internal cooling performance is degraded.
With such a structure, it is possible to more accurately determine the deterioration of the cooling performance when the engine is automatically stopped.

  The air conditioning control device according to the present invention can be applied to electric vehicles such as electric vehicles and hybrid vehicles, and various vehicles.

1 vehicle 2 engine 3 storage battery (battery)
4 Car compartment 5 Air conditioning control device 6 Air conditioning unit 26 Evaporator 31 Compressor 32 Electric motor 33 Engine side electromagnetic clutch 35 Compressor side electromagnetic clutch 37 Electric motor side electromagnetic clutch 39 Drive belt 40 Control means (control controller)
DESCRIPTION OF SYMBOLS 41 Evaporator temperature sensor 42 Battery voltage sensor 43 Outside temperature sensor 44 Crew setting panel 45 Engine automatic stop means 46 Engine automatic restart means 47 Cooling performance fall determination means 48 Electric motor drive means 49 Target temperature calculation means

Claims (2)

  Engine automatic stop means for automatically stopping the engine when a preset engine automatic stop condition is satisfied, and engine automatic restart means for automatically restarting the engine when a preset engine automatic restart condition is satisfied In the vehicle air conditioning control device having the control means, the compressor for compressing the refrigerant, the evaporator for cooling the air blown into the vehicle interior, and the compressor driven by the power supplied from the storage battery An electric motor to be driven, and the control means is configured to determine whether or not the cooling performance in the passenger compartment has deteriorated, and cooling performance deterioration determining means; and the engine automatic stop condition is satisfied and the engine is automatically stopped. When it is determined that the cooling performance in the passenger compartment is reduced by the cooling performance reduction determination means, Air conditioning control device for a vehicle, characterized in that it comprises an electric motor driving means for driving the motive.   Evaporator temperature detection means for detecting the temperature of the evaporator is provided, and the control means includes target temperature calculation means for calculating a target temperature of the evaporator from a target temperature and an outside air temperature in the vehicle interior, and the cooling performance deterioration determination The means reduces cooling performance in the vehicle interior when a difference between the evaporator temperature detected by the evaporator temperature detecting means and the target temperature of the evaporator calculated by the target temperature calculating means exceeds a predetermined value. The vehicle air conditioning control device according to claim 1, wherein it is determined that the vehicle is operating.

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