JP2014159201A - Air-conditioning control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit both cooling performance and drivability by estimating cold storage amount of an evaporator and optimizing stop control of a compressor.SOLUTION: An air-conditioning control device for a vehicle includes: a compressor 4 operated by power of an internal combustion engine mounted to the vehicle to compress a refrigerant; an evaporator 8 that has a cold storage element 13 and can convert part of cold air of the refrigerant into a cold blast and store the remainder of the cold air in the cold storage element 13 during a cooling operation; and control means 29 for performing air-conditioning control of inside of a cabin by the cold air stored in the cold storage element 13 while the compressor 4 is stopped. The air-conditioning control device further includes cold storage amount calculation means 39 for calculating the amount of the cold air stored in the cold storage element 13, and the control means performs stop control of the compressor in operation, on the basis of a stop condition that changes in accordance with the cold storage amount calculated by the cold storage amount calculation means.

Description

  The present invention relates to a vehicle air conditioning control device, and in particular, by optimizing the stop timing and stop time of a compressor that is driven by the power of an internal combustion engine and compresses a refrigerant, to achieve both cooling performance and drivability. The present invention relates to a vehicle air conditioning control device.

A vehicle that is driven by the power of the internal combustion engine includes a compressor that is driven by the power of the internal combustion engine and compresses the refrigerant, and includes an evaporator that exchanges heat between the refrigerant and the air blown into the vehicle interior. Some of them are equipped with a vehicle air-conditioning control device that controls an air-conditioning device that realizes a cooling function by converting the cold air of the refrigerant into cold air.
On the other hand, recently, an idle stop vehicle that automatically stops the internal combustion engine when the automatic stop condition is satisfied and automatically restarts the internal combustion engine when the automatic restart condition is satisfied is increasing. In an idle stop vehicle, when the internal combustion engine is stopped to improve fuel efficiency, the cooling function stops due to loss of power of the compressor of the air conditioner. There is a problem that cold air cannot be blown out immediately.

  One solution to this problem is an air conditioner having an evaporator with a cold storage element. The evaporator equipped with this cool storage element utilizes the fact that it is not possible to convert all of the cool air of the evaporator into cool air during cooling operation. It has a function to store. By using the cold air stored in the evaporator, it is possible to blow cold air into the vehicle compartment while the internal combustion engine is stopped by the idle stop vehicle. (JP 2011-68190 A)

JP 2011-68190 A

By the way, in general, since a vehicle traveling with the power of the internal combustion engine drives the compressor of the air conditioner by the power of the internal combustion engine, the power of the internal combustion engine used for traveling of the vehicle decreases due to the load of the compressor during the cooling operation. It cannot be avoided. Decreasing the power of the internal combustion engine will lead to deterioration of drivability, so as a countermeasure, when the occupant depresses the accelerator pedal, control to stop the compressor and improve the acceleration feeling, or the occupant depresses the brake pedal. In such a case, there is a control for increasing the pedaling force assisting ability by stopping the compressor and using a brake master back using the intake negative pressure, and these are collectively referred to as an air conditioner cut control.
However, when the compressor is stopped by the air conditioner cut control, the refrigerant cannot be compressed, so the temperature of the evaporator rises, the temperature of the blown air from the air conditioner rises, and the cooling performance decreases. There is.
In this way, there is a trade-off between cooling performance and drivability, and if the compressor is shut down for a long time with priority given to drivability, the cooling capacity will be reduced, causing discomfort to the passengers. There is a possibility to give. On the other hand, when the time for stopping the compressor is set short in order to improve the cooling performance, the power of the internal combustion engine is used for the compressor and the drivability deteriorates, which may cause discomfort to the passengers. .

  An object of the present invention is to realize both cooling performance and drivability by estimating the amount of cold stored in the evaporator and optimizing the stop control of the compressor.

  The present invention includes a compressor that is driven by the power of an internal combustion engine mounted on a vehicle and compresses the refrigerant, and a cold storage element, and converts part of the cold air of the refrigerant into cold air during cooling operation, and the rest In the vehicle air conditioning control device, comprising: an evaporator capable of storing cold air in the cold storage element; and a control means for controlling air conditioning of a vehicle interior by the cold air stored in the cold storage element while the compressor is stopped. The compressor is provided with cold storage amount calculation means for calculating the amount of cold air stored in the element, and the control means is based on a stop condition that changes according to the cold storage amount calculated by the cold storage amount calculation means. Is controlled to stop.

This invention estimates a cold storage amount of a cold storage element of an evaporator and optimizes the time or time to stop a compressor in operation based on the cold storage amount, thereby stopping the compressor for a longer time. Is something that can be done.
According to the present invention, the stop control of the compressor can be finely set based on the cold storage amount of the evaporator, and the fuel consumption can be improved by extending the time during which the compressor is stopped.

FIG. 1 is a system configuration diagram of a vehicle air conditioning control device. (Example) FIG. 2A is a diagram illustrating a coefficient α for calculating the amount of cold storage, and FIG. 2B is a diagram illustrating a cold storage level calculated from the amount of cold storage. (Example) FIG. 3 is a block diagram of the air conditioning control by the vehicle air conditioning control device. (Example) 4A is a diagram showing the relationship between the establishment and non-establishment of the stop condition during acceleration travel, FIG. 4B is a diagram showing the threshold B of the vehicle speed condition, and FIG. 4C is the threshold C of the accelerator opening condition. FIG. (Example) FIG. 5 is a flowchart for determining whether the acceleration stop condition is satisfied or not. (Example) FIG. 6A is a diagram showing the relationship between establishment and non-establishment of the stop condition during full-open travel, and FIG. 6B is a diagram showing the threshold E of the accelerator opening condition. (Example) FIG. 7 is a flowchart of the establishment / non-establishment of the stop condition at the time of full open travel. (Example) FIG. 8A is a diagram showing the relationship between establishment and non-establishment of the stop condition when securing brake negative pressure, and FIG. 8B is a diagram showing the threshold G of the brake negative pressure condition. (Example) FIG. 9 is a flowchart of the establishment / non-establishment of the stop condition when the brake negative pressure is secured. (Example) FIG. 10 is a diagram illustrating a relationship between establishment and non-establishment of the compressor stop condition depending on the running state. (Example) FIG. 11 is a flowchart for determining whether the compressor stop condition is satisfied or not according to the running state. (Example)

  Embodiments of the present invention will be described below with reference to the drawings.

1 to 11 show an embodiment of the present invention. In FIG. 1, a vehicle 1 is equipped with an internal combustion engine 2 that generates power for traveling, and an air conditioner 3. The air conditioner 3 of the vehicle 1 includes a compressor 4 that is driven by the power of the internal combustion engine 1 and compresses the refrigerant, and a blower fan 7 that supplies air to the air conditioning passage 6 formed by the air conditioning duct 5; An evaporator 8 that generates cold air using the latent heat of vaporization of the refrigerant and a heater core 9 that generates hot air using the heat of the cooling water of the internal combustion engine 2 are disposed.
The compressor 4 is driven by the power of the internal combustion engine 2 to compress the refrigerant. The compressed refrigerant is cooled and liquefied by the condenser 10 and the receiver 11 and supplied to the evaporator 8. The refrigerant that has been heated and expanded by heat exchange with air in the evaporator 8 is recovered by the compressor 4 and compressed again. The blower fan 7 is driven by a fan motor 12 and supplies air from the air conditioning passage 6 to the passenger compartment. The evaporator 8 includes a cold storage element 13 (for example, paraffin or the like), converts a part of the cold air of the refrigerant into cold air during the cooling operation, and can store the remaining cold air in the cold storage element 13. The heater core 9 converts the air in the air conditioning passage 6 into hot air during heating operation. The heater core 9 divides the air conditioning passage 6 into a heater core passage 14 and a bypass passage 15 by being biased to one side.
The air conditioning passage 6 is provided with a suction port damper 16 upstream of the blower fan 7, an air mix damper 17 is provided upstream of the intermediate heater core 9, and air outlet dampers 18 and 19 are provided downstream of the heater core 9. ing.
The air inlet damper 16 is operated by an air inlet actuator 20, and air in the vehicle compartment (inside air) sucked from the inside air inlet 21 and air outside the vehicle compartment (outside air) sucked from the outside air inlet 22 into the air conditioning passage 6. Selectively introduce. The air mix damper 17 is actuated by an air mix actuator 23, adjusts the ratio of hot air flowing through the heater core passage 14 and cold air flowing through the bypass passage 15, and controls the conditioned air blown into the passenger compartment for cooling or heating. Adjust the blowing temperature. The air outlet dampers 18 and 19 are actuated by air outlet actuators 24 and 25 to selectively blow out conditioned air from the air outlets 26, 27, and 28 according to the air conditioning mode.
The engine 2, the compressor 4, the fan motor 12, the inlet actuator 20, the air mix actuator 23, and the outlet actuators 24 and 25 are connected to the control means 29. The control means 29 includes an air conditioner switch 30 for driving / stopping the air conditioner 3, an accelerator position sensor 31 for detecting the accelerator position that is the depressed state of the accelerator pedal, a vehicle speed sensor 32 for detecting the vehicle speed of the vehicle 1, and an internal combustion engine. The brake negative pressure sensor 33 for detecting the master back brake negative pressure for assisting the depression force of the brake pedal using the intake negative pressure 2 and the evaporator temperature sensor 34 for detecting the temperature of the evaporator 8 are connected.
The control means 29 constitutes an internal combustion engine automatic stop control device 35 that automatically stops and restarts the internal combustion engine 2 together with the accelerator opening sensor 31 and the vehicle speed sensor 32. The control means 29 constituting the internal combustion engine automatic stop control device 35 includes an automatic stop means 36 and an automatic restart means 37. The control unit 29 controls the fuel injection valve and the ignition device to automatically stop the internal combustion engine 2 when a predetermined condition (automatic stop condition: for example, when the vehicle is stopped) is established by the automatic stop unit 36, and automatically restarts the internal combustion engine 2. When the different predetermined conditions (automatic re-automatic conditions: for example, when starting) are satisfied, the fuel injection valve, the ignition device / starter motor are controlled to automatically restart the internal combustion engine 2 that has been automatically stopped.
Therefore, the vehicle 1 is an idle stop vehicle that stops the internal combustion engine 2 when a predetermined condition is satisfied.

The control means 29 includes the compressor 4, the fan motor 12, the suction port actuator 20, the air mix actuator 23, the air outlet actuators 24 and 25, the air conditioning switch 30, the accelerator opening sensor 31, the vehicle speed sensor 32, the brake negative pressure. Together with the sensor 33 and the evaporator temperature sensor 34, a vehicle air-conditioning control device 38 is configured. The vehicle air-conditioning control device 38 includes the compressor 4 that is driven by the power of the internal combustion engine 2 to compress the refrigerant, and the cool storage element 13, and converts a part of the cool air of the refrigerant into cold air during the cooling operation. The evaporator 8 capable of storing the remaining cool air in the cool storage element 13 and the control means 29 for controlling the air conditioning of the vehicle interior by the cool air stored in the cool storage element 13 while the compressor 4 is stopped are provided.
The control means 29 constituting the vehicle air-conditioning control device 38 includes a cold storage amount calculation means 39 for calculating the amount of cold air stored in the cold storage element 13, and changes according to the cold storage amount calculated by the cold storage amount calculation means 39. Compressor stop control means 40 for controlling the stop of the compressor 4 based on the stop condition is provided. The control unit 29 calculates the cold storage amount of the cold storage element 13 by the cold storage amount calculation unit 39, and operates based on the stop condition that changes according to the cold storage amount calculated by the cold storage amount calculation unit 39 by the compressor stop control unit 40. The compressor 4 inside is stopped and controlled. The stop condition is set by the compressor stop control means 40 in accordance with the traveling state of the vehicle 1 (idle stop vehicle).
Note that the control for stopping the compressor 4 according to the stop condition set in accordance with the above-described travel state (for example, during acceleration travel, during full-open travel, when brake negative pressure is secured, etc.) is also referred to as air conditioner cut control.

Next, air conditioning control by the vehicle air conditioning controller 38 will be described.
In a vehicle air-conditioning control system for an air-conditioning system equipped with an evaporator that does not have a cool storage element, the control to stop the compressor for the purpose of improving drivability is more effective as the frequency of stopping the compressor and the time for stopping the compressor are increased. Although it is easy, there is a problem that cooling performance deteriorates by doing so.
However, as shown in FIG. 1, in the vehicle air conditioning control device 38 of the air conditioner 3 equipped with the evaporator 8 provided with the cool storage element 13, the compressor 4 is stopped if the cool storage amount of the cool storage element 13 is sufficient. However, cold air can be blown out by the cold air stored in the cold storage element 13 for a certain amount of time. Therefore, the vehicle air-conditioning control device 38 calculates the cold storage amount of the cold storage element 13 (FIG. 2), and sets the threshold value for executing the stop control of the compressor 4 according to the calculated cold storage amount of the cold storage element 13 according to the traveling state. By varying and setting the stop control of the compressor 4 (FIGS. 3 to 11), the stop frequency and stop time of the compressor 4 are increased as much as possible. At this time, the threshold value according to the running state is set so that the cooling capacity does not deteriorate.
In this embodiment, as a stop control of the compressor 4 for improving drivability,
(1) Stop control during acceleration travel (for improving acceleration force)
(2) Stop control during full-open travel (for improving acceleration when the accelerator is fully open)
(3) Stop control when securing brake negative pressure (for improving brake assist capability)
Is described.

The vehicle air-conditioning control device 38 obtains the coefficient α for calculating the amount of cold storage according to the evaporator temperature from the table shown in FIG. The amount of cold storage [%] is calculated from the time during which the evaporator temperature has continued with the formula for calculating the amount of cold storage.
-Cold storage amount [%] = Cold storage amount (previous) [%] + coefficient α [%] * time [sec]
The vehicle air-conditioning control device 38 calculates the current cold storage level (for example, 1 to 7) from the calculated cold storage amount [%] from the table shown in FIG. When the evaporator temperature exceeds the threshold A [° C.], the cold storage amount [%] is set to 0 [%]. (Control function 1)

As shown in FIG. 3, the vehicle air-conditioning control device 38 uses the compressor stop control means 40 to obtain the cold storage level and the accelerator opening sensor 31 in the cold storage element 13 of the current evaporator 8 obtained using the control function 1. A stop condition at the time of acceleration traveling set by the control function 2 is determined from the detected accelerator opening and the vehicle speed detected by the vehicle speed sensor 32, and the fully open traveling set by the control function 3 from the cold storage level and the accelerator opening. Stop condition is determined from the cold storage level, the vehicle speed, and the brake negative pressure detected by the brake negative pressure sensor 33, and the stop condition when the brake negative pressure set by the control function 4 is secured is determined. Based on the judgment of the stop condition, the judgment of the stop condition at the time of the fully open traveling, the judgment of the stop condition at the time of securing the brake negative pressure, and the ON / OFF signal of the air conditioning switch 30 Determining a stop condition of the compressor 4 by the control function 5 Te performs stop control of the compressor 4.
Thereby, the vehicle air-conditioning control device 38 is a compressor 4 during acceleration traveling, which is air-conditioner cut control for improving drivability, in accordance with the current cold storage level (control function 1) of the evaporator 8 obtained from the evaporator temperature. The timing at which the stop control of the compressor 4 (control function 2), the stop control of the compressor 4 during fully open travel (control function 3), and the stop control of the compressor 4 when the brake negative pressure is secured (control function 4) is changed. Thus, by increasing the stop control time of the compressor 4 (control function 5), improvement in drivability is realized while suppressing a decrease in cooling capacity to a minimum.

In the stop control of the compressor 4 during acceleration traveling, the vehicle air conditioning control device 38 sets the vehicle speed condition threshold value B according to the cold storage level from the table shown in FIG. From the table shown, the threshold value C of the accelerator opening condition is set according to the cold storage level, the threshold value D of the elapsed time after the condition of vehicle speed <threshold B and accelerator opening> threshold C is established, and FIG. As shown, the establishment / non-establishment of the stop condition (hereinafter referred to as “acceleration travel stop condition”) of the compressor 4 during acceleration travel by the threshold B, threshold C, and threshold D is determined. (Control function 2)
The stop control of the compressor 4 during acceleration traveling is a control for improving the acceleration performance by stopping the compressor 4 when it is determined that the occupant wants the acceleration performance. It is determined whether or not the occupant is in a “state in which the accelerator opening is opened beyond a certain value (threshold C)” in a “state that is less than a certain value (threshold B)”. In the stop control of the compressor 4 during acceleration travel, the higher the cold storage level (1-7) calculated earlier, the more easily the stop condition is established between the vehicle speed threshold B and the accelerator opening threshold C. Set to value.

As shown in FIG. 5, the vehicle air-conditioning control device 38, when the program for determining whether the acceleration stop condition is satisfied or not is started (100), determines whether the acceleration stop condition is not satisfied (101). .
If this determination (101) is YES (condition is not satisfied), the vehicle speed condition threshold value B is determined according to the cold storage level (102), the accelerator opening condition threshold value C is determined according to the cold storage level (103), and the vehicle speed is determined. Is less than the threshold value B (104).
If this determination (104) is YES (less than threshold B), it is determined whether the accelerator opening is above threshold C (105).
If this determination (105) is YES (exceeding the threshold value C), the stop condition during acceleration traveling is established (106), and the process returns to determination (101) (107).
On the other hand, if the determination (101) that the acceleration travel stop condition is not satisfied is NO (the condition is satisfied), the acceleration travel stop that measures the elapsed time after the vehicle speed <threshold B and accelerator opening> threshold C is satisfied. The timer counts up (continues timing) (108), and it is determined whether the elapsed time is less than the threshold value D (109).
If the determination (109) is YES (less than the threshold value D), the acceleration stop condition is determined to be satisfied (110), and the process returns to the determination (101) (107).
If the determination (104) whether the vehicle speed is less than the threshold B is NO (threshold B or more), the determination (105) whether the accelerator opening is greater than the threshold C is NO (threshold D or less). In this case, when the determination whether the elapsed time is less than the threshold value D (109) is NO (threshold value D or more), the time count of the acceleration travel stop timer is returned to “0” (111), and the acceleration travel stop condition Is not established (112), and the process returns to the decision (101) (107).

The vehicle air-conditioning control device 38 sets the accelerator opening condition threshold value E according to the cold storage level from the table shown in FIG. A threshold value F of the elapsed time after the condition of the threshold value E is established, and as shown in FIG. 6 (A), as shown in FIG. ")") Is confirmed. (Control function 3)
The stop control of the compressor 4 at the time of the fully open traveling is a control that exhibits the acceleration performance to the maximum by stopping the compressor 4 when it is determined that the occupant desires the acceleration performance to the maximum. It is determined whether or not the occupant has opened the accelerator opening to a considerably high value (threshold E). In the stop control of the compressor 4 during the full-open travel, the accelerator opening threshold E is set to a value that makes it easier to satisfy the stop condition as the previously calculated cold storage level (1-7) is higher.

As shown in FIG. 7, the vehicle air-conditioning control device 38 determines whether or not the stop condition at the time of fully open travel is not satisfied (201) when the program for determining whether or not the stop condition at fully open travel is satisfied (200). .
When this determination (201) is YES (condition is not satisfied), a threshold value E of the accelerator opening condition is obtained according to the cold storage level (202), and it is determined whether the accelerator opening is over the threshold value E (203).
If the determination (203) is YES (exceeding the threshold value E), the stop condition at the time of full-open running is established (204), and the process returns to the determination (201) (205).
On the other hand, if the determination (201) that the stop condition during full-open travel is not satisfied is NO (condition is satisfied), a stop timer during full-open travel that counts the elapsed time after the condition of accelerator opening> threshold E is satisfied ( (Timekeeping continues) (206), and it is determined whether the elapsed time is less than the threshold F (207).
If the determination (207) is YES (less than the threshold value E), it is determined that the stop condition during full-open travel is satisfied (208), and the process returns to determination (201) (205).
Further, when the determination (203) whether the accelerator opening is greater than the threshold E is NO (threshold E or less), the determination (207) whether the elapsed time is less than the threshold F is NO (threshold E or more). In this case, the timing of the stop timer at the time of full opening is returned to “0” (209), the stop condition at the time of full opening is not established (210), and the process returns to the determination (201) (205).

In the stop control of the compressor 4 when the brake negative pressure is ensured, the vehicle air conditioning control device 38 sets a brake negative pressure securing condition threshold G according to the cold storage level from the table shown in FIG. A threshold value H of an elapsed time after the condition of negative pressure <threshold G is satisfied is set, and, as shown in FIG. "Stop condition when securing brake negative pressure" is determined). (Control function 4)
The stop control of the compressor 4 at the time of securing the brake negative pressure is because the brake negative pressure is insufficient when the master back brake negative pressure is used as a pedaling force assist function when the occupant steps on the brake pedal. It is determined whether the brake negative pressure is less than a certain value (threshold G) so that the assist does not function. If “the brake negative pressure is less than a certain value (threshold G)”, the compressor 4 This control ensures the brake negative pressure by stopping. In the stop control of the compressor 4 when securing the brake negative pressure, the brake negative pressure threshold G is set so that the stop condition is more easily established as the previously calculated cold storage level (1-7) is higher. Note that “the brake negative pressure is less than a certain value (threshold G)” (brake negative pressure <threshold G) means that the brake negative pressure approaches the value on the atmospheric pressure side of the threshold G and becomes weaker. is there.

As shown in FIG. 9, the vehicle air-conditioning control device 38 determines whether the stop condition for securing the brake negative pressure is not established when the program for determining whether the stop condition for securing the brake negative pressure is established or not (300). (301).
When this determination (301) is YES (condition is not satisfied), a threshold value G of the brake negative pressure ensuring condition is obtained according to the cold storage level (302), and it is determined whether the brake negative pressure is less than the threshold value G (303). .
If this determination (303) is YES (less than the threshold G), it is determined that the brake negative pressure securing stop condition is satisfied (304), and the process returns to determination (301) (305).
On the other hand, if the determination (301) that the brake negative pressure securing stop condition is not satisfied is NO (satisfied condition), a brake negative pressure securing stop timer that counts the elapsed time after the condition of brake negative pressure <threshold G is satisfied. Count up (continue timing) (306), and determine whether the elapsed time is less than the threshold value H (307).
If the determination (307) is YES (less than the threshold G), it is determined that the brake negative pressure securing stop condition is satisfied (308), and the process returns to the determination (301) (305).
Further, when the determination (303) whether the brake negative pressure is less than the threshold G is NO (threshold G or more), the determination (307) whether the elapsed time is less than the threshold H is NO (threshold H or more). In this case, the stop time of the brake negative pressure securing timer is reset to “0” (309), the brake negative pressure securing stop condition is determined to be unsatisfied (310), and the process returns to the determination (301) (305).

As shown in FIG. 10, the vehicle air conditioning control device 38 controls the stop of the compressor 4 as follows.
The stop condition of the compressor 4 is satisfied when the air conditioning switch 30 is turned ON / OFF, the stop condition during acceleration travel is satisfied / not satisfied, or the stop condition during full-open travel is satisfied / not satisfied, or the stop condition is satisfied / not satisfied when the brake negative pressure is secured.・ Determine failure. (Control function 5)
As shown in FIGS. 2 to 9, the stop control of the compressor 4 in each of the above running states is performed by changing the thresholds A to H according to the current cold storage level. It is determined whether one of the stop condition, the stop condition when fully running, or the stop condition when securing the brake negative pressure is satisfied. When at least one of the stop condition at the time of acceleration travel, the stop condition at the time of full open travel, and the stop condition at the time of securing the brake negative pressure is satisfied, the compressor 4 is stopped to improve drivability. The stop of the compressor 4 at this time is set to such an extent that the cooling performance is not deteriorated based on the current cold storage amount.

As shown in FIG. 11, when the program for determining whether or not the stop condition for the compressor 4 is satisfied is started (400), the vehicle air conditioning controller 38 inputs the evaporator temperature detected by the evaporator temperature sensor 34 (401). Then, the coefficient α for calculating the cold storage amount is calculated (402), the cold storage amount is calculated by the cold storage amount calculation formula (403), and the ON / OFF signal of the air conditioning switch 30 is input (404).
Further, the vehicle air-conditioning control device 38 inputs information on establishment / non-establishment of the stop condition during acceleration travel (405), inputs information on establishment / non-establishment of the stop condition during full-open travel (406), and stops when the brake negative pressure is secured. Information on the establishment / non-establishment of conditions is input (407), and it is determined whether the air conditioning switch 30 is OFF (the air conditioner 3 is stopped) (408).
If this determination (408) is YES (switch OFF), the stop condition of the compressor 4 is established (409), and the process returns to determination (401) (410).
On the other hand, if the determination (408) of whether the air conditioning switch 3 is OFF is NO (switch ON), the air conditioning apparatus 3 is being driven and the acceleration traveling stop condition is satisfied, or the suspension is stopped when fully opened. It is determined whether the condition is satisfied or whether the stop condition when the brake negative pressure is secured is satisfied (411).
If this determination (411) is YES (at least one condition is satisfied), the stop condition of the compressor 4 is satisfied (409), the compressor 4 is stopped, and the process returns to the determination (401) (410). When this determination (411) is NO (all conditions are not satisfied), the stop condition of the compressor 4 is not satisfied (412), and the compressor 4 is not stopped and the process returns to the determination (401) (410).

Thus, the vehicle air-conditioning control device 38 obtains the cold storage amount of the cold storage element 13 provided in the evaporator 8 (control function 1), and the stop condition of the compressor 4 set according to the running state from the obtained cold storage amount. Is determined (control function 2 to control function 4), whether or not the determined stop condition is satisfied is determined (control function 5), and the compressor 4 is controlled to stop.
Thereby, the vehicle air-conditioning control device 38 can estimate the cold storage amount of the evaporator 8 and can optimize the timing or the stop time of stopping the compressor 4 in operation based on the cold storage amount. The time compressor 4 can be stopped.
The vehicle air-conditioning control device 38 can finely set the stop control of the compressor 4 based on the cold storage amount of the evaporator 8, and the fuel consumption can be improved by extending the time during which the compressor 4 is stopped.
In addition, the vehicle air-conditioning control device 38 sets the stop condition of the compressor 4 according to the traveling state of the vehicle 1 (accelerated traveling, fully opened traveling, and when brake negative pressure is secured).
The vehicle air-conditioning control device 38 can execute the stop control of the compressor 4 that is optimum for each traveling state by changing the setting of the stop control of the compressor 4 according to the traveling state of the vehicle 1. The power consumption of the internal combustion engine 2 due to the driving of 4 is suppressed, and drivability can be improved. Thereby, the vehicle air-conditioning control device 38 can realize both cooling performance and drivability.
Further, since the vehicle 1 is an idle stop vehicle that stops the internal combustion engine 2 when a predetermined condition (automatic stop condition) is satisfied, the internal combustion engine 2 is stopped when the predetermined condition is satisfied based on the cold storage amount stored in the evaporator 8. The stop control of the compressor 4 at the time can be optimized.
In the above-described embodiment, the type of stop control of the compressor 4 and the details of the control function are only shown as an example, and control for improving drivability not mentioned can be added. In the above-described embodiment, control information is input from the air conditioning switch 30, the accelerator opening sensor 31, the vehicle speed sensor 32, the brake negative pressure sensor 33, and the evaporator temperature sensor 34. However, the input elements for other controls are increased or decreased. You can also Furthermore, when determining the threshold value for determining the stop control of the compressor 4, the current vehicle environment (for example, outside air temperature, inside air temperature, solar radiation, etc.) can be determined in addition to the cold storage amount.

  The vehicle air-conditioning control apparatus according to the present invention can be applied to a vehicle equipped with an air-conditioning apparatus that drives a compressor with the power of an internal combustion engine.

DESCRIPTION OF SYMBOLS 1 Idling stop vehicle 2 Internal combustion engine 3 Air conditioner 4 Compressor 7 Blower fan 8 Evaporator 9 Heater core 13 Cold storage element 29 Control means 30 Air conditioning switch 31 Accelerator opening sensor 32 Vehicle speed sensor 33 Brake negative pressure sensor 34 Evaporator temperature sensor 35 Internal combustion engine automatic Stop control device 36 Automatic stop means 37 Automatic restart means 38 Vehicle air conditioning control device 39 Cold storage amount calculation means 40 Compressor stop control means

Claims (3)

  A compressor that is driven by the power of an internal combustion engine mounted on a vehicle and compresses the refrigerant, and a cool storage element, converts a part of the cool air of the coolant to cool air during cooling operation, and converts the remaining cool air to the cool storage In a vehicle air-conditioning control device comprising an evaporator that can be stored in an element and a control unit that controls air-conditioning of a vehicle interior by cold air stored in the cold-storage element while the compressor is stopped, the vehicle is stored in the cold-storage element The control unit is configured to stop the compressor in operation based on a stop condition that changes in accordance with the amount of cool storage calculated by the cold storage amount calculation unit. A vehicle air-conditioning control device.   The vehicle air conditioning control device according to claim 1, wherein the stop condition is set according to a traveling state of the vehicle.   The vehicle air conditioning control device according to claim 1, wherein the vehicle is an idle stop vehicle that stops the internal combustion engine when a predetermined condition is satisfied.

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