JP2003226129A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent blow-off of cool air toward a passenger, and to prevent the window from getting fogged when starting an engine. <P>SOLUTION: This air conditioner for a vehicle is provided with a blower fan 12A for a driver's seat and a blower fan 12B for a passenger seat possible to be separately operated from each other. When the operation for heating the only driver's seat is commanded by the operation of a driver's seat side automatic switch 27A in the condition that the engine cooling water temperature Tw is less than the predetermined value TW1, a compressor 2 is operated, and the blower fan 12A for a driver's seat is stopped and the lower fan 12B for a passenger seat is operated at a low speed. On the other hand, when the operation for heating the only passenger seat is commanded by the operation of a passenger seat side automatic switch 27B, the compressor 2 is operated, and the blower fan 12B for a passenger seat is stopped and the blower fan 12A for a driver's seat is operated at a low speed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for performing so-called low water temperature start-up control for limiting the drive of a blower fan when the engine cooling water temperature is low during heating.

[0002]

2. Description of the Related Art A vehicle air-conditioning system for performing this kind of low water temperature start control is disclosed in, for example, Japanese Patent No. 3186334 and Japanese Unexamined Patent Application Publication No.
No. 00-225837.

In the apparatus disclosed in Japanese Patent No. 3186334, when the low water temperature condition in which the engine cooling water temperature is lower than a predetermined value and the compressor operating condition by turning on the air conditioner switch are satisfied, the compressor is turned on within a predetermined time after the complete explosion of the engine when the engine is started. While starting, the drive speed of the blower fan is limited to a low speed for a predetermined time.

In the apparatus described in Japanese Patent Laid-Open No. 2000-3186334, when the low water temperature condition is satisfied at the time of engine start, the compressor is started for several seconds and then stopped, and the blower fan is stopped for a predetermined time.

[0005]

The device described in the above publication has the following problems. (1) In the device described in Japanese Patent No. 3186334, since the blower fan is driven when the engine is started, cold air is blown toward the occupant even when a heating operation is requested, which causes discomfort to the occupant. (2) In the device described in Japanese Patent Laid-Open No. 2000-3186334, the drive of the blower fan is stopped when the low water temperature condition is satisfied, so that fogging of the window is likely to occur and the visibility cannot be secured.

The present invention provides an air conditioner for a vehicle, which can secure a visibility without causing discomfort to an occupant even when the engine cooling water temperature is low at the time of starting the engine.

[0007]

(1) An air conditioner for a vehicle according to a first aspect of the present invention cools air by heat exchange between a compressor driven by an engine and pumping a refrigerant, and this cooling. A heat exchange means for heating air by heat exchange with engine cooling water, a blower fan for the driver's seat that blows out the air whose temperature has been adjusted by the heat exchange means from the driver's side toward the passenger compartment, and a temperature adjustment by the heat exchange means Blower fan for the passenger's seat that blows out the stored air from the passenger side toward the passenger compartment, air conditioning operation on the driver's side by the operation of the compressor and blower fan for the driver's seat, and passenger's seat by the operation of the compressor and the blower fan for the passenger's seat Operation means for respectively instructing the side air conditioning operation, determination means for determining whether the engine cooling water temperature is in a low water temperature condition unsuitable for heating operation, and operation When the heating operation is instructed only on the driver's side by the step operation, if the determination means determines that the low water temperature condition is satisfied, the compressor is operated and the blower fan for the driver's seat is stopped to turn on the blower fan for the passenger's seat. An air conditioning control unit for operating the control unit is provided. (2) The vehicle air conditioner according to the invention of claim 2 cools the air by exchanging heat between the compressor driven by the engine and pumping the refrigerant, and the refrigerant, and exchanging the cooling air with the engine cooling water. A heat exchanging means for heating by the heat exchanging means, and a blower fan for the driver's seat, which blows out the air whose temperature is adjusted by the heat exchanging means from the driver's side toward the passenger compartment,
The passenger side blower fan that blows out the air whose temperature is adjusted by the heat exchange means from the passenger side toward the passenger compartment, the driver side air conditioning operation by the operation of the compressor and driver side blower fan, and the compressor and passenger side blower. Operation means for respectively instructing the passenger side air conditioning operation by the operation of the fan, judgment means for judging whether the engine cooling water temperature is in a low water temperature condition unsuitable for heating operation, and only the passenger side by operating the operation means When the heating operation is instructed, when the determination means determines that the low water temperature condition is satisfied, the air conditioner control means operates the compressor and stops the passenger seat blower fan to operate the driver seat blower fan. It is characterized by (3) According to the invention of claim 3, in the vehicle air conditioner according to claim 1 or 2, when a heating operation is instructed to both the driver's seat side and the passenger's seat side by the operation of the operation means, the low temperature is determined by the determination means. When it is determined that the water temperature condition is satisfied, the air conditioning control means operates the compressor, stops the driver seat blower fan, and operates the passenger seat blower fan. (4) The invention according to claim 4 is the vehicle air conditioner according to any one of claims 1 to 3, after the low water temperature condition is satisfied,
When the determination means determines that the low water temperature condition is released, the air conditioning control means operates the compressor, the driver's seat blower fan, and the passenger seat blower fan in accordance with the air conditioning command from the operation means operated when the low water temperature condition is satisfied. It controls each operation. (5) The invention of claim 5 is the vehicle air conditioner according to any one of claims 1 to 4, wherein the air conditioning control means operates when the low water temperature condition is satisfied, the driver seat blower fan or the passenger seat blower. The rotation speed of the fan is controlled to a predetermined minimum speed for a predetermined time. (6) The invention according to claim 6 is the vehicle air conditioner according to any one of claims 1 to 5, further comprising an air volume setting means for manually setting the air volumes of the blower fan for the driver seat and the blower fan for the passenger seat. When the operating means and the air volume setting means are simultaneously operated, the air conditioning control means operates the blower fan for the driver's seat and the blower fan for the passenger seat according to the setting by the air volume setting means regardless of the determination result by the determination means. It is a thing.

[0008]

As described in detail above, according to the present invention, a driver seat blower fan and a passenger seat blower fan are provided, respectively, and the driver seat side or the passenger seat side is provided under a low engine cooling water temperature condition. When the heating operation command is issued, the compressor is operated, the blower fan for which the heating operation command is issued is stopped, and the other blower fan is operated, so that cold air is prevented from being blown to the passengers. It is possible to secure a good field of view.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of a vehicle air conditioner according to an embodiment of the present invention. The compressor 2 is driven by the engine 1, and the refrigerant is compressed by driving the compressor 2. The compressed refrigerant sequentially passes through the condenser 3, the liquid tank 4, the expansion valve 5, and the evaporator 6 that form a known refrigeration cycle together with the compressor 2, and returns to the compressor 2. The cooling water of the engine 1 is pressure-fed to the heater core 7 by a water pump (not shown) and returns to the engine 1.
The evaporator 6 and the heater core 7 are arranged in the air conditioning duct 10.

The air conditioning duct 10 has a driver seat duct 10A that guides air to the driver seat side air outlet and a passenger seat duct 10B that guides air to the passenger seat side air outlet. Each duct 10A,
A blower fan 12A for the driver's seat and a blower fan 12B for the passenger's seat are arranged inside 10B. Motors 11A and 11B are respectively connected to the blower fans 12A and 12B, and the blower fans 12A and 12B rotate independently of each other by driving the motors 11A and 11B. Inside / outside air switching doors 13A, 13B are provided at the inlets 14A, 14B upstream of the blower fans 12A, 12B, respectively. By rotating the doors 13A, 13B, only the inside air or only the outside air or both the inside air and the outside air are duct 10A. , 10B.

The air blown by the blower fans 12A, 12B passes through the evaporator 6 and is cooled by heat exchange with the refrigerant. On the upstream side of the heater core 7, air mix doors 8A and 8B which are rotatable in the duct passage are provided, respectively. The cooling air that has passed through the evaporator 6 passes through or bypasses the heater core 7 depending on the opening degree of the air mix doors 8A and 8B. The cooling air that has passed through the heater core 7 is heated by heat exchange with engine cooling water, and this heating air and the cooling air that bypassed the heater core 7 are mixed downstream of the heater core to adjust the air temperature. Then, the air after the temperature adjustment is sent to each duct 10A, 1
The air is blown toward the vehicle interior through an air outlet (not shown) (vent air outlet, defroster air outlet, foot air outlet, etc.) provided at the end of 0B. Note that FIG. 1 shows a state where all the cooling air has passed through the heater core 7, that is, a full hot state.

A door for opening and closing the air outlet is provided at each air outlet, and the door is opened and closed according to the air conditioning mode. The air-conditioning mode includes, for example, a VENT mode in which air is blown only from the vent outlet, a bi-level mode in which air is blown from the vent outlet and the foot outlet, a FOOT mode in which air is blown from the foot outlet, and an air from the foot outlet and the defroster outlet. And a DEF mode in which air is blown from the defroster outlet.

FIG. 2 is a diagram showing a part of the configuration of the control system of the vehicle air conditioner according to the present embodiment, mainly showing the configuration relating to the air volume control and the compressor control. It should be noted that the present embodiment is applied to an automatic air conditioner that automatically adjusts the vehicle interior temperature to a set temperature. In the air conditioning control unit 21,
An outside air temperature sensor 22 for detecting an outside air temperature, an indoor temperature sensor 23 for detecting an indoor temperature, an insolation amount sensor 24 for detecting an insolation amount, an intake temperature sensor 25 for detecting an air temperature downstream of the evaporator 6, and an engine. A water temperature sensor 26 that detects a cooling water temperature and an air conditioning operation switch 27 that is operated by an occupant and inputs various air conditioning commands are connected.

The air conditioning operation switch 27 is a driver side auto switch 27 for instructing the driver side air conditioning operation.
A, a passenger side auto switch 27B for instructing the air conditioning operation on the passenger side, a driver side fan switch 27C for arbitrarily setting the amount of air blown from the driver side, and an assistant for arbitrarily setting the amount of air blown from the passenger side Seat side fan switch 27
D, economy switch 27E for instructing economy operation of the air conditioner, differential switch 27F for instructing window fog removal operation, REC switch 27G for instructing internal air circulation,
It comprises a temperature control switch 27H for inputting a set temperature. The rotation speeds of the blower fans 12A and 12B can be switched to, for example, four stages according to the operation of the fan switches 27C and 27D.

The air conditioning control unit 21 executes predetermined processing in response to the input signals from the sensors 22 to 26 and the switch 27, and causes the drive control circuits of the motors 11A and 11B, the various actuators 29, and the engine control unit 30 respectively. Output a control signal. Motor 11A, 1
A voltage corresponding to the output signals to the drive control circuits 28A and 28B is applied to 1B, and the applied voltage causes the motor 11 to operate.
A and 11B rotate. The actuator 29 is an actuator for rotating the air mix doors 8A, 8B, an actuator for rotating the inside / outside air switching doors 13A, 13B, an actuator for rotating the air outlet opening / closing doors, and the like. The engine control unit 30 is connected to an electromagnetic clutch 32 via a relay 31, and excites or demagnetizes the relay 31 according to an output signal from the engine control unit 30 to turn on or off the electromagnetic clutch 32. When the electromagnetic clutch 32 is turned on, the rotation of the engine 1 is transmitted to the compressor 2 and the compressor 2 is driven. When the electromagnetic clutch 32 is turned off, the transmission is released and the compressor 2 is stopped.

FIG. 3 is a flow chart showing an example of processing relating to the air volume control executed by the air conditioning control unit 21 of the present embodiment. This flow chart is executed in a predetermined cycle after the ignition switch IGN is turned on, for example, and a fan voltage is applied to the motors 11A and 11B to control the rotation of the blower fans 12A and 12B as follows. In the figure, the driver's seat side and the passenger's seat side are represented by Dr side and As side, respectively.

When the air volume control is started, step S101
Then, it is determined whether or not the driver side fan switch 27C is turned on, that is, whether or not the air volume is manually set. When step S101 is affirmed, the process proceeds to step S102, and the fan voltage corresponding to the operation of the fan switch 27C is applied to the motor 11A. This allows a blower fan for the driver's seat 1
2A rotates at a speed according to the operation of the fan switch 27C. Next, in step S103, the driver side fan flag is set to M, and the process proceeds to step S107. On the other hand, if step S101 is denied, the process proceeds to step S104,
It is determined whether or not the driver's seat side auto switch 27A is on, that is, whether or not the air volume is automatically set. When step S104 is affirmed, it progresses to step S106, and when step S104 is denied, ie, switch 27.
When both A and 27C are off, the process proceeds to step S105. The driver side fan flag is set to 0 in step S105, the driver side fan flag is set to A in step S106, and the process proceeds to step S107.

In step S107, it is determined whether or not the passenger seat side fan switch 27D is on, that is, whether or not the air volume is manually set. When step S107 is positive, the process proceeds to step S108, and the fan voltage according to the operation of the fan switch 27D is applied to the motor 11B. As a result, the passenger seat blower fan 12B rotates at a speed corresponding to the operation of the fan switch 27D. Next, in step S109, the passenger seat side fan flag is set to M, and the process proceeds to step S113. On the other hand, if step S107 is denied, the routine proceeds to step S110, where it is determined whether or not the passenger seat side auto switch 27B is on, that is, whether or not the air volume is automatically set. If step S110 is positive, the process proceeds to step S112. If step S110 is negative, that is, when both the switches 27B and 27D are off, the process proceeds to step S111. In step S111, the passenger seat side fan flag is set to 0, and in step S11
In 2, the passenger seat side fan flag is set to A, and the process proceeds to step S113.

In step S113, the air conditioning mode is FO.
It is determined whether the OT mode or the D / F mode is set. This is a process of determining whether or not there is a request for heating operation. That is, in an auto air conditioner,
The air conditioning mode is automatically controlled according to the calculated value of the target outlet temperature, and when the target outlet temperature is high, the FOOT mode or D
/ F mode is set. If step S113 is affirmed, it is determined that the heating operation is required, and the process proceeds to step S120. In step S120, it is determined whether the engine cooling water temperature TW is less than a predetermined value TW1. This is a process for determining whether or not the engine cooling water temperature has risen to a temperature suitable for heating operation, and the predetermined value TW1 is, for example, 5
It is set in the range of 0 ° C to 60 ° C. This step S11
3. In step S120, it is determined whether low water temperature start control is necessary. That is, steps S113 and S12
When both 0 are affirmed, it is determined that the low water temperature start control is necessary and the process proceeds to step S121. When either step S113 or step S114 is negative, the low water temperature start control is determined to be unnecessary and the process proceeds to step S114.

In step S114, the value of the driver side fan flag is determined. When the fan switch 27C is on (flag = M), the process proceeds to step S117, and when the auto switch 27A is on (flag = A), the step S1.
Proceed to 16 and switch 27A, fan switch 2
If both 7C are off (flag = 0), step S1
Proceed to 15. In step S116, a fan voltage according to the target blown air volume is applied, and the process proceeds to step S117. As a result, the driver's seat blower fan 12A rotates at a speed corresponding to the target blown air volume. The calculation of the target blown air volume in the automatic air conditioner is well known and will not be described. In step S115, the fan applied voltage is set to 0 to stop the rotation of the blower fan 12A, and the process proceeds to step S117.

In step S117, the value of the passenger's seat side fan flag is determined. If the fan switch 27D is on (flag = M), the process returns, and if the auto switch 27B is on (flag = A), the process proceeds to step S119. If both the auto switch 27B and the fan switch 27D are off (flag = 0), the process proceeds to step S118. In step S119, a fan voltage according to the target blown air volume is applied, and the process returns. As a result, the passenger seat blower fan 12B rotates at a speed according to the target blown air volume. In step S118, the fan applied voltage is set to 0 to stop the rotation of the blower fan 12B, and the process returns.

In step S121, it is determined whether or not the compressor operating condition is satisfied. This is a process of determining whether or not the compressor 2 is operating. When the compressor ON signal (A / C signal) is output by the compressor control (FIG. 4) described later, the operating condition is satisfied and the output of the ON signal is canceled. And the operating condition is not satisfied. If the operating condition is not satisfied, step S121 is denied and the process proceeds to step S122.

In step S122, it is determined whether or not the driver side fan flag is M. When step S122 is negative, that is, when the driver's seat side fan switch 27C is off, the process proceeds to step S123, the fan applied voltage is set to 0, and the rotation of the driver's seat blower fan 12A is stopped. When step S122 is affirmed, step S123 is skipped and the process proceeds to step S124. In step S124, it is determined whether or not the passenger seat side fan flag is M. Step S124
Is negative, that is, when the passenger side fan switch 27D is off, the process proceeds to step S125, and the fan applied voltage is set to 0.
Then, the rotation of the passenger seat blower fan 12B is stopped. If step S124 is positive, step S125
Pass and return.

On the other hand, when the compressor operating condition is satisfied, step S121 is affirmed and the routine proceeds to step S126, where the value of the t flag is judged. When the engine is started, the t flag is 0, and when it is determined that t flag = 0, the process proceeds to step S127. In the low water temperature startup control, the fan air volume is limited to the minimum air volume by a predetermined waiting time tOFF as described later (steps S132, S136),
In step S127, the waiting time tOFF is calculated. Here, the waiting time tOFF is calculated such that it becomes longer as the target blowout temperature is higher. Then, step S128
Then, t flag = 1 is set, and the process proceeds to step S129.
When the waiting time tOFF has already been calculated, it is determined in step S126 that t flag = 1, and step S12
After passing step S128, the process proceeds to step S129. The t flag is reset to 0 when the engine is stopped.

In step S129, it is determined whether the driver side fan flag is A or not. When step S129 is affirmative, that is, when the driver's seat side auto switch 27A is on, the process proceeds to step S130, the fan applied voltage is set to 0, and the rotation of the driver's seat blower fan 12A is stopped. Then
In step S131, it is determined whether or not the passenger seat side fan flag is M, and the result is negative, that is, the passenger seat side fan switch 27D.
Is determined to be off, the process proceeds to step S132, and if step S131 is affirmative, the process returns.

In step S132, step S127
The minimum voltage L0 is applied to the passenger's seat motor 11B for the delay time tOFF calculated in step S1, and the fan voltage output is increased at a predetermined rate (for example, 0.34 V / min) after the delay time tOFF. As a result, the blower fan 12B for the passenger seat rotates at the minimum speed until the delay time tOFF, and thereafter the fan 1
The rotation speed of 2B gradually increases. That is, the driver side auto switch 27A is turned on, and the passenger side fan switch 2 is turned on.
When 7D is turned off, the minimum air flow rate tOFF is blown from the passenger side for a predetermined time, and thereafter, the blown air volume gradually increases.

If step S129 is negative, that is, if it is determined that the driver's seat side auto switch 27A is off, the process proceeds to step S133. In step S133, it is determined whether or not the passenger seat side fan flag is A, and if the result is affirmative, that is, if the passenger seat side auto switch 27D is on, step S1.
If the determination is negative, the process proceeds to step S122. In step S134, the fan applied voltage is set to 0 to stop the rotation of the passenger seat blower fan 12B. Next, in step S135, it is determined whether the driver seat side fan flag is M or not. If step S135 is negative, that is, if the driver side fan switch 27C is determined to be off, the process proceeds to step S136, and if step S135 is affirmative, the process returns.

In step S136, step S127
The minimum voltage L0 is applied to the motor 11A for the driver's seat for the delay time tOFF calculated in step S1, and the output of the fan voltage is increased at a predetermined rate (for example, 0.34 V / min) after the delay time tOFF has elapsed. As a result, the blower fan 12A for the driver's seat rotates at the minimum speed until the delay time tOFF, and then the fan 1
The rotation speed of 2 A gradually increases. That is, the driver side auto switch 27A is turned off, and the passenger side auto switch 2 is turned off.
When 7B is turned on and the driver's seat side fan switch 27C is turned off, the driver's seat side blows out the minimum air volume for the predetermined time tOFF, and thereafter, the blown air volume gradually increases. The delay time tOFF in steps S132 and S136 and the rate of voltage increase after the delay time tOFF may be set to be different from each other.

Next, the compressor control will be described. FIG. 4 is a flowchart showing an example of processing relating to compressor control executed by the air conditioning control unit 21 of the present embodiment. This flowchart is executed in a predetermined cycle after the ignition switch IGN is turned on, for example, and outputs a control signal as described below to operate or stop the compressor 2.

When the compressor control is started, it is determined in step S201 whether or not the blower fans 12A and 12B are operating, that is, whether or not the fan voltage is applied to the motors 11A and 11B. Blower fan 12
If it is determined that A and 12B are stopped, the process proceeds to step S202, and it is determined whether or not the above-described low water temperature start control is performed, that is, step S113 and step S120 in FIG.
Are both affirmatively determined. When the air-conditioning mode is the FOOT mode or the D / F mode and the engine cooling water temperature TW is less than the predetermined value TW1, it is determined that the low water temperature start control is being performed (the low water temperature fan start condition is satisfied in the figure), and the process proceeds to step S204. It proceeds to step S203. In step S203, the engine control unit 30
The output of the compressor-on signal (A / C signal) to is canceled and the process returns. As a result, the compressor 2 is stopped.

When the blower fans 12A, 12B are operating or the low water temperature starting control is being performed, it is determined in step S204 whether the differential switch 27F is on, that is, the air conditioning mode is DE.
It is determined whether the F mode is set. If it is determined that the DEF mode is selected, the process proceeds to step S207, and if it is determined that the DEF mode is not set, the process proceeds to step S205.
In step S205, it is determined whether the A / C flag is on, and in step S206 it is determined whether the ECON flag is on. The A / C flag is a switch 27 for operating the air conditioner.
It turns on in conjunction with turning on A and 27B, and the ECON flag turns on in conjunction with turning on economy switch 27E.
When both the A / C flag and ECON flag are off,
Since the operation command of the compressor 2 has not been issued, the process proceeds to step S203, and the output of the compressor on signal is canceled. If either the A / C flag or the ECON flag is on, the process proceeds to step S207.

In step S207, the outside air temperature sensor 22
The variable CF is set to any one of 1, 2 and 3 based on the outside air temperature Tam detected by. The temperature set values T1, T2, T3, T4 in step S207 are set to, for example, −5, −2, 12, and 13 ° C., respectively. In step S208, the value of the variable CF set in step S207 is determined. When the variable CF = 3, that is, when the outside temperature is considerably low, the process proceeds to step S203, and the variable CF
When = 1 or 2, the process proceeds to step S209. In step S209, it is determined whether the ECON flag is on.
Differential switch 27F or auto switch 27A, 27
When B is turned on, the economy switch 27E is turned off,
Step S209 is denied and the routine proceeds to step S215. In step S215, a compressor on signal is output to the engine control unit 30, and the process returns. As a result, the compressor 2 operates.

If it is determined in step S209 that the ECON flag is on, the process proceeds to step S210, and it is determined whether or not the REC switch 27G is on, that is, whether or not internal air circulation is in progress. If step S210 is affirmed, step S215
If it is denied, the process proceeds to step S211. In step S211, it is determined whether or not the outside air is set by the inside / outside air switching doors 13A and 13B. When both the inside air and the outside air are introduced, step S211 is denied and the process proceeds to step S215. When only the outside air is introduced, step S211 is affirmed and the process proceeds to step S212. In step S212, the target outlet temperature XM is calculated based on the input signals from the temperature control switch 27H and the sensors 22 to 25, and the process proceeds to step S213.

In step S213, the compressor ON state or OFF state is set as shown based on the difference between the calculated target outlet temperature XM and the outside air temperature Tam detected by the outside air temperature sensor 22, and this set state is set. Is determined in step S214. If it is determined in step S214 that the compressor is on, the process proceeds to step S215 to output the compressor on signal, and if it is determined to be in the compressor off state, the process proceeds to step S203 to cancel the output of the compressor on signal.

The main operation of the present embodiment configured as above will be described. (1) Air conditioner on the driver's seat side, air conditioner on the passenger's seat side off The engine cooling water temperature TW is a predetermined value TW immediately after the engine starts
When it is lower than 1, when the driver's seat side auto switch 27A is turned on to perform the heating operation on the driver's seat side, the low water temperature start control is started. At this time, if the compressor 2 is operating by the above-described processing (step S215),
The blower fan 12A for the driver's seat stops and the blower fan 12B for the passenger's seat rotates at a low speed for a predetermined holding time tOFF (step S130, step S132). This prevents low-temperature air from being blown from the driver's seat side, thereby preventing the driver from feeling uncomfortable. Further, since the dehumidified air is blown out from the passenger seat side, the fog on the window is removed and the visibility can be secured. In this case, if there is no passenger in the passenger seat, there is no problem even if cold air is blown from the passenger seat side. Even if there is an occupant in the passenger seat, the occupant does not feel much discomfort because the amount of blown air is small.

When the predetermined waiting time tOFF has elapsed, the fan rotation speed gradually increases in accordance with the characteristics of step S132 described above, and the amount of air blown from the passenger side increases accordingly. At this time, since the engine cooling water temperature rises at the same time, the blown air temperature rises due to heat exchange with the engine cooling water in the heater core 7. As a result, the passenger in the passenger seat is not significantly discomforted. Further, since only the passenger seat blower fan 12B operates, the amount of heat exchange with the engine cooling water is reduced as compared with the case where both blower fans 12A and 12B operate. As a result, the rise of the engine cooling water temperature is promoted, and the blown air temperature can be raised quickly. In addition, both blower fans 12A,
The electrical load is reduced compared to the case of operating 12B,
Fuel efficiency is improved.

When the engine cooling water temperature TW reaches the predetermined value TW1, the low water temperature starting control is ended and the normal air volume control is automatically restored. As a result, the air volume corresponding to the set temperature is blown from the driver's seat side, and the blowing from the passenger's seat side is stopped (steps S116 and S118). In this case, a troublesome switch operation is not required when shifting from the low water temperature start control to the normal air volume control, and the operability is also good.

When the passenger seat side fan switch 27D is turned on during the low water temperature start control, the passenger seat blower fan 12B is rotated according to the command speed of the switch 27D (step S108). This allows the amount of air blown from the passenger seat side to be adjusted arbitrarily. In addition, when the driver side fan switch 27C is turned on during the low water temperature start control, the switch 2
The driver's seat blower fan 12A rotates according to the commanded speed of 7C (step S102). As a result, a desired air volume is blown from the driver's seat side. In this case, the air is blown out from the driver's seat side according to the driver's own selection, so that the discomfort caused by the cold air blowing does not pose a problem.

On the other hand, during the low water temperature start control, the compressor 2
Is stopped (step S203), both blower fans 12A and 12B remain stopped, and the blowout of air into the vehicle interior is blocked (steps S123 and S125). As a result, it is possible to prevent the air that is not dehumidified from being blown out when the auto switch 27A is turned on. In this case, in order to forcefully blow out the air, the fan switches 27C and 27D may be operated (steps S102 and S108).

(2) Driver side air conditioner off, passenger side air conditioner on When only passenger side auto switch 27B is turned on to perform heating operation on the passenger side, if engine cooling water temperature TW is lower than predetermined value TW1 The low water temperature start control is started.
At this time, if the compressor 2 is operating, the passenger seat blower fan 12B is stopped and the driver seat blower fan 1
2A rotates at a low speed for a predetermined waiting time tOFF (steps S134 and S136). This prevents the low-temperature air from blowing out from the passenger seat side, and prevents the passenger in the passenger seat from feeling uncomfortable. Further, since the dehumidified air is blown out from the driver's seat side, window fog is removed and the visibility can be secured.

When the predetermined waiting time tOFF elapses, the fan rotation speed gradually increases in accordance with the characteristic of step S136 described above, and the amount of air blown from the driver's side increases accordingly. When the engine cooling water temperature TW reaches the predetermined value TW, the low water temperature start control ends and the normal air volume control is restored. As a result, the air volume corresponding to the set temperature is blown from the passenger seat side, and the blow from the driver seat side is stopped (steps S119 and S115). In this case, a troublesome switch operation is not required when shifting from the low water temperature start control to the normal air volume control, and the operability is also good.

When the driver's seat side fan switch 27C is turned on during the low water temperature start control, the driver's seat blower fan 12A rotates according to the command speed of the switch 27C (step S102). This allows the amount of air blown from the driver's seat side to be adjusted arbitrarily. In addition, when the passenger seat side fan switch 27D is turned on during the low water temperature start control, the switch 2
The passenger seat blower fan 12B rotates in accordance with the commanded speed of 7D (step S108). As a result, a desired air volume is blown out from the passenger seat side.

(3) Driver side air conditioner ON, passenger side air conditioner ON When the engine cooling water temperature TW is lower than a predetermined value TW1, the automatic switch 27A, for performing heating operation on both the driver side and the passenger side, When each of the 27B is turned on, the low water temperature start control is started. At this time, if the compressor 2 is operating, the driver seat blower fan 12A is stopped and only the passenger seat blower fan 12B is rotated (step S).
130, step S132). As a result, it is possible to prevent the driver from feeling uncomfortable, and it is possible to remove the fogging of the window by the air blown from the passenger side. In addition,
If the fan switches 27C and 27D are turned on during the low water temperature start control, the blower fans 12A and 12B can be arbitrarily rotated (steps S102 and S10).
8).

When the engine cooling water temperature TW reaches the predetermined value TW1, the low water temperature starting control ends and the normal air volume control is restored. As a result, air volumes corresponding to the set temperatures are blown out from the driver's seat side and the passenger's seat side, respectively (step S11).
6, step S119). As a result, the passenger compartment is warmed rapidly and the temperature distribution in the passenger compartment becomes uniform. In this case, a troublesome switch operation is not required when shifting from the low water temperature start control to the normal air volume control, and the operability is also good.

As described above, according to this embodiment, the blower fans 12A and 12B for blowing air toward the driver's seat side and the passenger's seat side are provided, and the engine cooling water temperature TW is set.
When the heating operation on the driver's side is instructed when is lower than the predetermined value TW1, the low water temperature start control is performed, the compressor 2 is operated, and the blower fan 12B for the passenger seat is operated until the engine cooling water temperature TW reaches the predetermined value TW1. Is operated to stop the driver's seat blower fan 12A. As a result, the cold air is not blown out from the driver's seat side, so that the window fog can be removed by the air blown out from the passenger's seat side without giving a discomfort to the driver. Further, when the heating operation on the passenger side is instructed, the compressor 2 is operated by the low water temperature start control, and the blower fan 1 for the driver side is operated.
2A is actuated and the blower fan for the passenger seat is stopped, so that the window fog can be removed without giving the passenger on the passenger seat side a discomfort. In this case, by operating the auto switch 27A or 27B, it is possible to arbitrarily select which of the driver seat side and the passenger seat side is blown out to blow air.

In addition, the blower fan 1 is controlled during the low water temperature start control.
Since 2A and 12B are operated at a low speed for a predetermined waiting time tOFF, it is possible to minimize the blowing from the passenger side or the driver side. Further, when the engine cooling water temperature TW rises above the predetermined value TW1, the low water temperature starting control is terminated and the normal air conditioning control is automatically restored, so that a complicated operation for the restoring operation is unnecessary. When the fan switches 27C and 27D are operated, the blower fan 12 is given priority to the operation command regardless of whether the low water temperature start control is being performed.
Since A and 12B are operated, the air volume can be arbitrarily blown into the vehicle interior.

Further, when the heating operation for both the driver's seat side and the passenger's seat side is commanded in the state where the engine cooling water temperature TW is lower than the predetermined value TW1, the passenger's blower is blown until the engine cooling water temperature TW reaches the predetermined value TW1. The fan 12B is operated and the blower fan 12A for the driver's seat is stopped. As a result, it is possible to remove the fogging of the window by the air blown from the passenger side without making the driver feel uncomfortable, and after returning to the normal air conditioning control, the set temperature is set from both the driver side and the passenger side. Since the air corresponding to is blown out, the temperature in the vehicle interior can be made uniform quickly.

In step S121 of FIG. 3, the blower fan 12A, 1 is operated when the compressor operating condition is not satisfied.
Although 2B is stopped (steps S123 and S125), the blower fan 12 is stopped after a certain time has elapsed.
A and 12B may be operated with the minimum air volume.
This can prevent an occupant from erroneously recognizing that the fans 12A, 12B are out of order when the fans 12A, 12B are stopped for a long time.

Blower fan 12A during low water temperature start control,
The operation characteristics of 12B are the steps S132 and S1.
It is not limited to 36. Although the fan voltage is set with time as a parameter in steps S132 and S136, the fan voltage may be set with the engine cooling water temperature as a parameter. In this case, the higher the engine cooling water temperature, the higher the fan voltage. In step S113, the presence or absence of the heating operation request is determined according to the air conditioning mode, but it may be determined based on the set temperature. Although the above-described embodiment is applied to the automatic air conditioner, it can be similarly applied to the manual air conditioner. In this case, the fan flag in FIG. 3 may be set to A when both the manual air conditioner switch and the fan switch are on.

In the correspondence between the above embodiment and the claims, the evaporator 6 and the heater core 7 are heat exchanging means, the auto switches 27A and 27B are operating members, and the air conditioning control unit 21 (step S120) is a judging means. The air-conditioning control unit 21 functions as an air-conditioning control unit and a fan switch 27
C and 27D respectively constitute the air volume setting means. Among the processing in the air conditioning control unit 21, step S130, step S132, and step S215, step S
134, step S136, and step S215, step S116 and step S119, step S1
32 and step S136, step S102 and step S108 correspond to the air conditioning control means, respectively. Note that the constituent elements and steps for realizing each means are not limited to the above.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a diagram showing a partial configuration of a control system of the vehicle air conditioner according to the embodiment of the present invention.

FIG. 3 is a flowchart showing an example of processing related to air volume control executed by the air conditioning control unit according to the present embodiment.

FIG. 4 is a flowchart showing an example of processing relating to compressor control executed by the air conditioning control unit according to the present embodiment.

[Explanation of symbols]

1 Engine 2 Compressor 6 Evaporator 7 Heater core 10A, 10B Duct 11A, 11B Motor 12A Driver seat blower fan 12B Passenger seat blower fan 21 Air conditioning control unit 26 Water temperature sensor 27 Air conditioning operation switch 27A, 27B Auto switch 27C, 27D Fan switch

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60H 1/32 623 B60H 1/32 623S 626 626F 626G

Claims (6)

[Claims] 1. A compressor driven by an engine to pump a refrigerant, heat exchange means for cooling the air by heat exchange with the refrigerant, and heating the cooling air by heat exchange with engine cooling water; A blower fan for the driver's seat that blows out the air whose temperature is adjusted by the exchange means from the driver's side toward the passenger compartment, and a passenger's seat that blows the air whose temperature is adjusted by the heat exchanger means from the passenger side toward the passenger compartment. A blower fan, operating means for respectively instructing a driver side air conditioning operation by operating the compressor and the driver seat blower fan, and a passenger side air conditioning operation by operating the compressor and the passenger seat blower fan, and engine cooling Judgment means for judging whether or not the water temperature is in a low water temperature condition unsuitable for heating operation, and only the driver's seat side by the operation of the operation means. When the heating operation is instructed, when the determination means determines that the low water temperature condition is satisfied, the compressor is operated and the driver seat blower fan is stopped to operate the passenger seat blower fan. An air conditioner for a vehicle, comprising: 2. A compressor driven by an engine to pump a refrigerant, a heat exchange means for cooling air by heat exchange with the refrigerant, and heating the cooling air by heat exchange with engine cooling water; A blower fan for the driver's seat that blows out the air whose temperature is adjusted by the exchange means from the driver's side toward the passenger compartment, and a passenger's seat that blows the air whose temperature is adjusted by the heat exchanger means from the passenger side toward the passenger compartment. A blower fan, operating means for instructing a driver side air conditioning operation by operating the compressor and the driver seat blower fan, and an engine means for instructing a passenger side air conditioning operation by operating the compressor and the passenger seat blower fan, respectively, and an engine. Determination means for determining whether or not the cooling water temperature is in a low water temperature condition that is unsuitable for heating operation; When only the heating operation is instructed, when the determination means determines that the low water temperature condition is satisfied, the compressor is operated and the passenger seat blower fan is stopped to operate the driver seat blower fan. A vehicle air conditioner, comprising: a control unit. 3. The vehicle air conditioner according to claim 1 or 2, wherein the air conditioning control means determines the determination when the heating operation for both the driver seat side and the passenger seat side is commanded by the operation of the operation means. When the low water temperature condition is satisfied by the means, the compressor is operated, the driver seat blower fan is stopped, and the passenger seat blower fan is operated. 4. The vehicle air conditioner according to claim 1, wherein the air conditioning control unit determines that the low water temperature condition is released by the determination unit after the low water temperature condition is satisfied. And the compressor, the blower fan for the driver's seat, in accordance with an air conditioning command from the operating means operated when the low water temperature condition is satisfied,
And an air conditioner for a vehicle, which controls operations of the passenger seat blower fan, respectively. 5. The vehicle air conditioner according to any one of claims 1 to 4, wherein the air conditioning control means controls the driver seat blower fan or the passenger seat blower fan that operates when a low water temperature condition is satisfied. An air conditioner for a vehicle, wherein a rotation speed is controlled to a predetermined minimum speed for a predetermined time. 6. The vehicle air conditioner according to claim 1, further comprising air volume setting means for manually setting air volumes of the driver seat blower fan and the passenger seat blower fan, When the operating unit and the air volume setting unit are simultaneously operated, the air conditioning control unit is responsive to the setting by the air volume setting unit regardless of the determination result by the determination unit, and the driver seat blower fan and the passenger seat blower. A vehicle air conditioner characterized by operating a fan.