JP3223327B2 - Nap mode controller for vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nap mode control device for a vehicle air conditioner capable of controlling the temperature of a nap bed provided behind a driver's seat.

[0002]

2. Description of the Related Art A conventional air conditioner for a vehicle having a nap mode is, for example, as disclosed in Japanese Patent Publication No. 1-30645, a temperature adjusting device for adjusting the temperature of air supplied to a vehicle cabin, and a vehicle air conditioner. An air volume adjusting device for adjusting an air volume of air to be supplied; switch means for changing between a normal mode and a nap mode; and adjusting by the temperature adjusting apparatus in response to the nap mode being selected by the switch means. Temperature correction means for correcting the temperature of the air to a temperature suitable for a nap, and air volume restriction means for restricting the air volume of the air adjusted by the air volume adjustment means when the nap is selected by the switch means. Features.

In this vehicle air conditioner, a nap mode switch is provided so that the temperature and air volume of the vehicle compartment can be specially controlled to a state suitable for nap during operation thereof. Immediately after the start of a nap in winter, the air conditioner is stopped, and after the temperature has naturally dropped to a temperature suitable for nap, the air conditioner is operated again to maintain that temperature. In this case, the air volume is reduced as compared with the time of operation, and the temperature control is performed with the air volume fixed during the nap in the middle period.

[0004]

However, in the above-described vehicle air conditioner, when the outside air temperature is low and the vehicle is idling, sufficient heating capacity is required because the temperature of the engine cooling water supplied to the heater core decreases. However, there was a problem that the blow-out temperature was lowered despite the air mix door opening being 100% (full hot).

[0005] Therefore, an object of the present invention is to provide a nap mode control device for an air conditioner for a vehicle, which can prevent a decrease in blow-out temperature in a nap mode.

[0006]

The present invention will be described with reference to FIG. 1. In the air conditioning duct, an inside air inlet and an outside air inlet selected by an inside / outside air switching door 7, a blower, and a compressor 10 are provided. Cooling means for controlling the cooling capacity, heating means for controlling the heating capacity by the temperature of the supplied engine cooling water, and an air mix door 12 for adjusting the air passing through the heating means; A nap mode setting means 100 for setting a nap mode, and a nap mode set by the nap mode setting means 100, in a vehicle air conditioner for controlling the temperature of a nap bed provided on the driver's seat and the driver's seat behind the driver's seat The nap mode is set by the vehicle stop determining means 110 for determining whether the vehicle is stopped and the nap mode setting means 100. In this case, the heating capability determining means 120 for determining whether the opening of the air mix door 12 is fully open and the vehicle stopping determining means 110 determine that the vehicle is stopped, and A heating capacity maintaining means 130 for setting the inside / outside air switching door 7 to the inside air circulation mode and stopping the compressor 10 when the capacity determination means 120 determines that the air mix door opening is fully open. Is to do.

[0007]

Therefore, in the present invention, it is determined whether or not the vehicle is stopped by the vehicle stop determination means 110. When the vehicle is stopped, the temperature of the engine cooling water supplied to the heating means is determined. If it is determined that there is a possibility that the air mix door is fully opened by the heating capacity determination means 120, it is possible to determine that the heating capacity is at the limit. Because the inside / outside air switching door 7 is set to the inside air circulation mode by 130 to stop the introduction of low-temperature outside air, the cooling unit is stopped by stopping the compressor 10 so that a decrease in the temperature of the air passing through the heating unit can be suppressed. Thus, the heating ability of the heating means can be maintained, and the above object can be achieved.

[0008]

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

A vehicle air conditioner 1 shown in FIG.
Are arranged in an instrument panel 3 provided at the front of the cab 2, and have an inside air inlet 5, an outside air inlet 6 opened upstream of the air conditioning duct 4, and these inside air inlets 5 and outside air. It has an inside / outside air switching door (intake door) 7 which is appropriately selected and opened.

Downstream of the intake door 7 is a blower 8
An evaporator 9 that forms a cooling cycle by a compressor 10, a condenser, an expansion valve, and the like is provided downstream of the blower 8. Downstream of the evaporator 9, a heater core 11 to which cooling water for an engine (not shown) is supplied is provided, and an air mix door 12 that restricts air passing through the heater core 11 is arranged upstream of the heater core 11.
Further, a sub door 13 interlocked with the air mix door 12 is disposed downstream of the heater core 11.

The mode door 1 is located at the most downstream of the air conditioning duct 4.
4. Differential outlet 15 opened and closed by vent 4, vent outlet 1
6. The heat outlet 17 is open and the differential outlet 15
The vent outlet 16 communicates with an outlet opened at a predetermined position of the instrument panel 3 via a duct (not shown). The heat outlet 17 is communicated with the outlets 21 and 22 opened through the duct 18 at the feet of the driver's seat 19 and the passenger seat 20.

A duct 25 is connected to the heat outlet 17 and communicates with an outlet 24 opened near a nap bed 23 provided at the rear of the cab 2. The duct 25 is opened and closed at this connection. A bed outlet opening / closing door 26 is provided.

The cool air bypass passage 47 is connected to the evaporator 9.
Is provided in parallel with the air-conditioning duct 4, and is opened and closed by a bypass opening / closing door 48.

In the vehicle air conditioner 1 having the above configuration,
The inside air or outside air sucked by the drive of the blower 8 from the inside air inlet 5 or the outside air inlet 6 selected by the intake door 7 passes through the evaporator 9 and is cooled. The air cooled by passing through the evaporator 9 changes the air passing through the heater core 11 and the air flowing through the heater core 11 depending on the opening degree of the air mixing door 12.
The air is bypassed.

The heated air that has passed through the heater core 11 and the cooled air that has bypassed the heater core 11 are mixed downstream of the heater core 11 to obtain air that has been adjusted to a desired temperature. . The temperature-controlled air is blown into the cab 2 from the outlets 15, 16, 17 selected by the mode door 14, and
It controls the temperature inside. In addition, the bypass opening / closing door 48
Is opened, the cool air bypass passage 47 is opened, and the cool air immediately after passing through the evaporator 9 is directly blown out from the vent outlet 16, so that the cooling effect is promoted.

If the nap mode is set,
Bed outlet opening / closing door 2 provided at heat outlet 17
6 is opened, and a part of the air blown out from the heat outlet 17 is blown out from the outlet 24 opened near the nap bed 23 through the duct 25.

In order to control the vehicle air conditioner 1,
A microcomputer 26 is provided, and signals from a temperature sensor 27 for detecting a vehicle interior temperature, a temperature sensor 28 for detecting an outside air temperature, a solar radiation sensor 29 for detecting an amount of solar radiation, and a temperature sensor 30 for detecting an evaporator outlet temperature are provided. The signal is input through a multiplexer (MPX) 31 and an A / D converter 32, and further a signal from an operation panel 33 described below is input.

As shown in FIG. 3, an operation panel 33 has an AUTO switch 34 for automatically controlling the air conditioner.
a and the control by the AUTO switch 34a is AU.
AUTO display unit 34 for displaying what is being done in TO
b, OFF switch 35 for stopping control of the air conditioner,
A temperature setting switch 36a for setting the vehicle interior temperature, a set temperature display section 36b for displaying the set temperature, and an A / C switch 37a for manually turning on / off the operation of the cooling cycle.
, An A / C display 37b for displaying the state of the A / C switch 37a, a MODE switch 38a for manually setting the blow mode to the upper blow mode or the lower blow mode, and a mode display section 38b for displaying the blow mode state. Switch 39 that opens and closes the bypass opening / closing door 48
and a COOL display section 39b for displaying that the COOL switch 39a has been opened, and a REC switch 4 for manually switching the intake air mode to the internal air circulation mode.
0a and an intake air mode display section 40b for displaying the intake air mode, a DEF switch 41a for manually setting the differential mode, a differential display section 41b for displaying the state of the DEF switch 41a, and a FAN switch for manually setting the air volume of the blower 8. 42a, an air volume display section 42b for displaying the operating state of the blower 8, and a nap mode switch 43a for setting a nap mode and a BED for displaying a nap mode setting.
It is configured by the display unit 43b.

The microcomputer 26 includes a central processing unit (CPU) (not shown) and a read-only memory (R).
OM), a random access memory (RAM), an input / output port (I / O), and the like, which processes the input signal by a predetermined program and outputs a control signal for controlling each air conditioner. Things.

A control signal output from the microcomputer 26 is supplied to an electromagnetic clutch 45 for connecting the compressor 10 and an engine (not shown) via an output circuit 44a.
The actuator 46a for driving the mode door 14 via the output circuit 44b, the actuator 46b for driving the air mix door 12 and the sub door 13 via the output circuit 44c, and the inside / outside air switching door 7 via the output circuit 44d. , The blower 8 via an output circuit 44e, the actuator 46d for driving the bed outlet opening / closing door 26 via an output circuit 44f, and the bypass opening / closing door 48 via an output circuit 44g. This is for controlling the actuator 46e.

The flowchart shown in FIG. 4 is a main control routine of the air conditioning control executed by the microcomputer 26. The main control routine is normally started from step 200 by turning on an ignition switch (not shown).

In step 210, the input signal and the setting signal from the operation panel 33 are read as data. Specifically, the vehicle interior temperature Td, the outside air temperature Ta,
The solar radiation amount Qs, the evaporator outlet temperature Te, and the vehicle interior set temperature Ts are read, and in step 220, a total signal T as a heat load signal is calculated by the following equation (1).

[0023]

T = ATd + BTa + CQs + DTe-ETs + F

A, B, C, D, and E are arithmetic constants obtained in order to obtain an optimum air-conditioning state through experiments.
Is a correction term obtained in the same manner.

Based on the total signal T, step 230
In, switching of the inside / outside air switching door (intake door) 7 is performed based on the characteristic diagram shown in FIG. In this characteristic diagram, REC indicates the inside air circulation mode, and FRE indicates the outside air introduction mode.

In step 240, the blower 8 is controlled based on the characteristic signal shown in FIG. In the figure, MAX HI
Indicates a maximum air volume, HI indicates a large air volume, and LOW indicates a low air volume.

In step 250, the opening of the air mix door 12 is determined based on the characteristic signal T shown in FIG. Note that in FIG. C. (Full cool) is the air mix door 12
F. indicates that the heater core 11 is fully closed (opening degree: 0%). H. (Full hot), the heater core 11 is fully opened by the air mix door 12 (opening degree 100).
%).

In step 260, the mode door 14 is set by the total signal T based on the characteristic diagram shown in FIG. In the figure,
VENT indicates a vent mode, BI-L indicates a bi-level mode, and HEAT indicates a heat mode.

In step 270, in addition to the above control, control of each display unit, compressor control, manually set control, and the like are performed, and the process returns to step 210.

In the other control in step 270, nap control according to the embodiment of the present invention shown in the flowchart of FIG. 6 is performed.

In the nap control started at step 300, at step 310, it is determined whether or not a nap mode is set. In this determination, if the nap mode is not set (N), the process proceeds to step 320 to turn off the nap mode display (BED) 43b, and proceeds to step 330 to close the duct 25 with the bed outlet opening / closing door 26. By doing so, the bed outlet 24 is closed, and the process returns from step 400 to the main control routine.

If it is determined in step 310 that the nap mode is the nap mode (Y), the process proceeds to step 340 to display the nap mode display (BED) 43b.
Is turned on, and the routine proceeds to step 350, where the duct 25 is opened by the bend outlet opening / closing door 26, thereby opening the air outlet 24.

Thereafter, in step 360, it is determined whether or not the vehicle is stopped. The meaning of this judgment is
This is because, when it is determined that the vehicle is stopped, it can be determined that the engine rotation is in the idling state, so that the temperature of the engine cooling water may decrease.

If it is determined in step 360 that the vehicle is stopped, then in step 370, the air mix door opening Θ is set to 100
It is determined whether it is not less than% (full open). In this determination, if the air mix door opening degree Θ is 100% or more, it can be determined that the blowout temperature is not sufficient and the air conditioner is maintaining the maximum heating state, so that the heater core 11 as the heating means can be determined. It means that the ability is reduced.

For this reason, in the steps 350 and 360, when the vehicle is stopped and the air mix door opening Θ is 100% or more, it is determined that the heating capacity of the heater core 11 is not sufficient. Then, in step 380, the intake door 7 is set to the inside air circulation mode (REC) to prevent the entrance of low-temperature outside air, and further, by stopping the compressor 10 in step 390, the driving of the cooling cycle is stopped.
The temperature of the air passing through the heater core 11 is prevented from lowering, and the blowing temperature is prevented from lowering. Thereafter, the process returns to the main control routine in step 400.

In step 360, when the vehicle is not stopped (N), and when the air mix door opening Θ is not 100% (N) in step 370, it is determined that the heating capacity of the heater core 11 has a margin. In order to be able to make a determination, the routine returns from step 400 to the main control routine to execute normal air conditioning control.

[0037]

As described above, according to the present invention, when the nap mode is set, the vehicle is stopped,
If the air mix door is fully open, it can be determined that the heating capacity of the heater core is reduced. Therefore, the intake door is set to the inside air introduction mode, and the heating capacity of the heater core is set by stopping the compressor. Can be maintained, and a decrease in the blowing temperature can be prevented.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an air conditioner according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of an operation panel of the air conditioner according to the embodiment of the present invention.

FIG. 4 is a flowchart of a main control routine of air conditioning control executed by the microcomputer.

5A is a characteristic diagram showing a relationship between the general signal T and the inside / outside air switching door, FIG. 5B is a characteristic diagram showing a relationship between the general signal T and the blower, and FIG. Is a characteristic diagram showing the relationship between the total signal T and the air mix door, and FIG.
FIG. 4 is a characteristic diagram showing the relationship between the total signal T and the mode door.

FIG. 6 is a flowchart illustrating a nap control routine.

[Explanation of symbols]

 7 Inside / outside air switching door 10 Compressor 12 Air mix door 100 Nap mode setting means 110 Vehicle stoppage determination means 120 Heating capacity determination means 130 Heating capacity maintenance means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-226316 (JP, A) JP-A-58-133913 (JP, A) JP-A-59-45211 (JP, A) JP-A-58-133 89413 (JP, A) Japanese Utility Model 4-11714 (JP, U) Japanese Patent Publication No. 1-30645 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60H 1/00 101

Claims (1)

(57) [Claims] 1. An inside air supply duct, an inside air introduction port and an outside air introduction port selected by an inside / outside air switching door, a blower,
A duct having cooling means whose cooling capacity is controlled by a compressor, heating means whose heating capacity is controlled by the temperature of the supplied engine cooling water, and an air mix door for adjusting air passing through the heating means; A nap mode setting means for setting a nap mode, wherein the nap mode is set by the nap mode setting means for setting a nap mode. A vehicle stop determining unit that determines whether the vehicle is stopped, and a heating capability that determines whether the air mix door is fully opened when the nap mode is set by the nap mode setting unit. Determining means for determining that the vehicle is stopped by the vehicle stop determining means, and setting the heating capacity to the target by the heating capacity determining means. If it is determined that the blowing temperature cannot be maintained,
A nap mode control device for a vehicle air conditioner, comprising: a heating capacity maintaining means for setting the inside / outside air switching door to an inside air circulation mode and stopping the compressor.