JP2015223896A - Vehicle air-conditioning controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to keep long an automatic engine stop period by idling stop at a time of opening a roof without unnecessarily increasing the temperature of an evaporator.SOLUTION: A temperature of an evaporator 5 for air-conditioning to be cooled with an engine used as a driving source is detected by a temperature sensor S4. The temperature detected by the temperature sensor S4 is controlled to be equal to a predetermined temperature. The engine is automatically stopped when a condition for idling stop including vehicle stop is satisfied. If the temperature detected by the temperature sensor S4 is equal to or higher than an upper limit temperature that is set higher than the predetermined temperature, the automatically-stopped engine is automatically restarted. The predetermined temperature at a time of opening a roof is changed to a lower temperature than the predetermined temperature at a time of closing the roof, thereby making it possible to keep a period of the automatic engine stop by the idling stop at the time of opening the roof longer than that at the time of closing the roof.

Description

  The present invention relates to a vehicle air conditioning control device.

  The vehicle air conditioning control device has a cold air generator including a compressor, a condenser, and an evaporator, and a hot air generator that uses engine cooling water as a heat source, and the mixing ratio of the cold air and the hot air is air-mixed. It is changed by a damper to obtain conditioned air at a desired temperature. The conditioned air is blown into the passenger compartment by the blower fan, and the amount of blown air is changed by changing the rotational speed of the blower fan. In general, the compressor is driven by an engine, and a water pump that circulates cooling water is also driven by the engine. Therefore, when the engine is stopped, the compressor and the water pump are stopped, and the cold air generation function and the hot air generation function are stopped.

  In the air conditioning control apparatus for a vehicle, an auto air conditioner that automatically controls the actual room temperature so as to reach the target room temperature is the mainstream. Automatic control of air conditioning is performed according to the environmental conditions inside the passenger compartment, the environmental conditions outside the passenger compartment, and the parameters indicating the air conditioning operation state (particularly the setting of the target indoor temperature) by the occupant. The air-conditioning air blowing amount and the like are automatically set.

  On the other hand, in recent vehicles, in order to improve fuel efficiency, many vehicles perform so-called idle stop that automatically stops the engine when the vehicle is stopped or at an extremely low speed just before the stop. This idle stop is executed on condition that a preset start condition is satisfied. Examples of the start condition include that the vehicle speed is zero (the vehicle is stopped) and that the brake is operated. Generally, it is set so as to satisfy all conditions such that the accelerator is not operated and the transmission is in the D position.

On the other hand, in a vehicle that can open and close a roof represented by an open car, as disclosed in Patent Document 1, it is disclosed that the air conditioning mode is changed between when the roof is opened and when the roof is closed. That is, it is disclosed that when the roof is closed, the inside / outside air mode based on the target blowing temperature is set, while when the roof is opened, the mode is forcibly changed to the inside air mode regardless of the target blowing temperature.
In Patent Document 1, the inside air mode is set when the roof is opened, so that the amount of air blown from the blowout opening of the air conditioning unit is made constant regardless of the vehicle speed.

JP 2001-88537 A

  By the way, when the engine is automatically stopped by idling stop during cooling or the like, the engine is automatically restarted when the temperature of the evaporator reaches a predetermined upper limit temperature or more while continuing the air conditioning control. Specifically, while the engine is driven, the air conditioning control is continued even after the engine is automatically stopped from the state where the air conditioning control is performed while maintaining the temperature of the evaporator in a temperature range of, for example, about 3 ° C. Then, the temperature of the evaporator gradually increases. When the temperature of the evaporator reaches an upper limit temperature (for example, 13 ° C.), the engine is automatically restarted.

  On the other hand, the air conditioning needs when the roof is open, where the user can enjoy traveling while touching the outside air, are relatively low compared to when the roof is closed. Therefore, it is conceivable that the period during which the engine is automatically stopped by idle stop is made longer when the roof is opened than when the roof is closed. For this reason, the upper limit temperature may be set (changed) to a higher temperature when the roof is open than when the roof is closed. However, if the upper limit temperature is changed to an unnecessarily high temperature, a so-called dry odor becomes a problem, which is practically difficult to employ. The dry odor is often expressed by sweat odor, tobacco odor, exhaust gas odor, interior odor, and the like. The cause of the dry odor is that the odor component absorbed in the water film on the surface of the evaporator due to the low temperature of the evaporator is released along with the evaporation of moisture adhering to the surface as the temperature of the evaporator increases. It is thought to be because.

  The present invention has been made in view of the circumstances as described above, and its purpose is to ensure a long period of automatic engine stop by idling stop when the roof is opened without unnecessarily increasing the temperature of the evaporator. An object of the present invention is to provide a vehicle air-conditioning control apparatus.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1,
A vehicle air conditioning control device for a vehicle having a roof that can be opened and closed,
An air conditioner equipped with an evaporator for air conditioning cooled by an engine as a drive source;
An evaporator temperature detecting means for detecting the temperature of the evaporator;
Evaporator temperature control means for controlling the evaporator temperature detected by the evaporator temperature detection means to be a predetermined temperature;
The engine is automatically stopped when an idle stop condition including a vehicle stop is satisfied, and when the temperature detected by the evaporation temperature detecting means is equal to or higher than the upper limit temperature set higher than the predetermined temperature, the engine is automatically stopped. Idle stop control means for performing restart,
A predetermined temperature changing means for changing the predetermined temperature to a lower temperature when the roof is open than when the roof is closed;
It is supposed to be equipped with. According to the above solution, when the roof is opened, the evaporator is at a lower temperature than when the roof is closed. Therefore, the period until the temperature of the evaporator reaches the upper limit temperature after the engine is automatically stopped by the idle stop becomes longer. Accordingly, it is possible to ensure a long period of engine automatic stop by idle stop. Of course, it is possible to lengthen the idle stop period when the roof is opened without unnecessarily changing the upper limit temperature to the high temperature side. Note that changing the evaporator temperature to a lower temperature when the roof is opened may cause a decrease in fuel efficiency.However, the period of automatic engine stop due to idle stop can be extended to improve overall fuel efficiency. it can.

A preferred mode based on the above solution is as described in claim 2 and the following claims. That is,
The predetermined temperature is set to a temperature at which the freezing degree of the evaporator does not become higher than a predetermined value (corresponding to claim 2). In this case, it is preferable for preventing the generation of odor during freezing due to the high freezing degree of the evaporator. The odor during freezing is expressed as a burnt odor or a solvent odor. The generation of odor during freezing is caused by the fact that the odor component dissolved in the condensed water on the surface of the evaporator cannot be completely dissolved by the freezing of the condensed water due to the lower temperature of the evaporator and is released. It is considered a thing.

  The upper limit temperature is set to a temperature lower than the temperature at which a dry odor is generated (corresponding to claim 3). In this case, the effect corresponding to claim 1 can be obtained while preventing the generation of a dry odor.

A stop prediction means for predicting the stop of the vehicle,
The predetermined temperature changing means changes the predetermined temperature to a lower temperature when the roof is opened, on condition that the stop prediction of the vehicle is predicted by the stop prediction means.
(Corresponding to claim 4). In this case, when the vehicle is predicted to stop when the roof is opened, that is, when the automatic engine stop due to idle stop is predicted, the evaporator is set to a low temperature, so the evaporator temperature is unnecessarily low. This prevents the situation from being left as it is, and is preferable for further improvement in fuel consumption.

  When the roof is opened, the idle stop control means automatically stops the engine after a predetermined time elapses from the time when the vehicle is stopped, while the predetermined temperature changing means is operated until the predetermined time elapses from the time when the vehicle is stopped. In this period, the predetermined temperature is changed to a low temperature (corresponding to claim 5). In this case, since the evaporator is set to a low temperature in a state where it is confirmed that the engine is automatically stopped by the idle stop, it is preferable to minimize the period during which the evaporator is set to a low temperature. In addition, it is possible to extend the time of the engine automatic stop by idle stop longer than the said predetermined time.

The vehicle has an automatic transmission that performs a shift based on a predetermined shift pattern;
Shifting pattern changing means for changing the shift pattern to a higher gear ratio than when the roof is closed when cooling is detected when the roof is opened and when the vehicle is decelerated, is further provided.
(Corresponding to claim 6). In this case, it is preferable to increase the engine speed by changing the shift pattern to a high gear ratio, and to effectively reduce the temperature of the evaporator accordingly. In particular, by setting the evaporator at a low temperature, energy regeneration during deceleration can be achieved, which is extremely preferable in this respect.

  ADVANTAGE OF THE INVENTION According to this invention, the period of the engine automatic stop by the idle stop at the time of roof opening can be lengthened, without making the upper limit temperature of the evaporator used as the threshold temperature which makes an engine restart automatically unnecessarily high.

The figure which shows a state when a roof is closed about the vehicle of a roof opening-and-closing type. The figure which shows a state when a roof is opened from the state of FIG. The system diagram which shows an example of an air conditioning system. The figure which shows an example of a cold air generator and a warm air generator. The figure which shows an example of the operation panel part of an air conditioning. The figure which shows the example of a control system of an air conditioning system. The figure which shows the example of a control system of an engine automatic stop. The figure which shows the example of arrangement | positioning of the sensor which detects the temperature of an evaporator. The time chart which shows the change of the evaporator temperature when the roof is opened and when the roof is closed in relation to the automatic engine stop by idling stop. The flowchart which shows the example of idle stop control.

  FIG. 1 shows a vehicle V that is a roof opening / closing type, and FIG. 1 shows a state in which the roof R is closed and the roof R is closed. Moreover, FIG. 2 shows the time of roof opening when the roof R is opened from the state of FIG.

  FIG. 3 shows a passage configuration example in the air conditioning system K. Since the air conditioning system K is known, it will be briefly described. The passage portion 2 having the inlet 1 has a switching damper 3, a blower fan 4, and an evaporator sequentially from the upstream side (inlet 1) to the downstream side. 5 is disposed. The downstream portion of the evaporator 5 in the passage portion 2 is divided into two independent passages 7 and 8 in parallel with each other by a partition wall 6, and the downstream side of the independent passages 7 and 8 is a common chamber 9 joined together. Yes.

  A heater core 10 is held on the partition wall 6 so as to protrude into the two independent passages 7 and 8. An air mix damper 11 is disposed in the independent passage 7 immediately upstream of the heater core 10. Similarly, an air mix damper 12 is disposed in the independent passage 8 immediately upstream of the heater core 10. An air passage 13 for the driver's seat is opened in the passage portion 2 so as to face the independent passage 7 upstream of the common chamber 9. Further, an air passage 14 for the passenger seat is opened in the passage portion 2 so as to face the independent passage 8 on the upstream side of the common chamber 9. Further, a plurality of air passages 15 to 17 are opened so as to face the common chamber 9. The air passage 15 is for a defroster, for example, and the air passages 16 and 17 are for a side vent, for example. In the air passages 13 to 17, dampers 13A to 17A for adjusting the opening are arranged.

  By changing the opening (position) of the air mix damper 11, the ratio of the cooling air that has passed through the evaporator 5 through the heater core 10 is changed, and the temperature and humidity of the air immediately after passing through the independent passage 7 are adjusted. The air immediately after passing through the independent passage 7 is supplied to the driver's seat. The air mix damper 11 is driven by an electric motor (actuator) 11A and can take an arbitrary opening within a range of 0% to 100%.

  By changing the opening (position) of the air mix damper 12, the ratio of the cooling air that has passed through the evaporator 5 through the heater core 10 is changed, and the temperature and humidity of the air after passing through the independent passage 8 are adjusted. The air immediately after passing through the independent passage 8 is supplied to the passenger seat. The air mix damper 12 is driven by an electric motor (actuator) 12A and can take any opening in the range of 0% to 100%.

  As is apparent from the above description, in the embodiment, the air conditioning for the driver seat and the passenger seat can be individually controlled. And when the opening degree of the air mix dampers 11 and 12 is set to 100% indicated by a solid line in the figure, the air conditioning temperature for the driver seat and the passenger seat is the highest. On the contrary, when the opening degree of the air mix dampers 11 and 12 is set to 0% indicated by a broken line in the figure, the air conditioning temperature for the driver seat and the passenger seat is the lowest. The air passages 15 to 17 are supplied with mixed air in which the conditioned air that has passed through the independent passages 7 and 8 is mixed.

  Reference numeral 18 denotes an inside air introduction port provided in the vicinity of the inflow port 1, and outside air introduction and inside air circulation are switched by the switching damper 1 described above.

  FIG. 4 shows a refrigerant circulation path for the evaporator 5 and an engine cooling water circulation path for the heater core 10. In FIG. 4, a belt 53 is wound between a pulley 51 attached to the rotation shaft of the compressor 50 and a pulley 52 attached to the engine EG (crankshaft thereof), and the compressor 50 is driven to rotate by the engine EG. The The refrigerant compressed by the compressor 50 is supplied to the evaporator 5 through the pipe 54, the condenser 55, and the pipe 56. The refrigerant supplied to the evaporator 5 is returned to the compressor 50 through the pipe 57 after heat exchange with the conditioned air. The compressor 50, the condenser 55, and the evaporator 5 are main components of the cold air generator. Note that a clutch 51A is incorporated in the pulley 51 so that the driving of the compressor 50 can be stopped as appropriate even when the engine EG is operating.

  On the other hand, the cooling water from the water pump 60 driven by the engine EG is supplied to the heater core 10 via the pipe 61 and is exchanged with the conditioned air by the heater core 10. Then, the cooling water in the heater core 10 is returned to the water pump 60 through the pipe 62. The water pump 60 and the heater core 10 are main components of the hot air generator.

  FIG. 5 shows an example of an air-conditioning panel KP operated by a passenger, and is set on the instrument panel. In the embodiment, the driver's seat and the passenger's seat are adapted to control the temperature independently on the left and right, and the switches operated by the occupant are set as follows.

  First, the switch 21 is a main switch for turning on the automatic air conditioner, and is a push type. The switch 22 is a temperature setting switch for the driver's seat and is a dial type. The switch 23 is an automatic air conditioner OFF switch, and is a push type. The switch 24 is an air volume adjusting switch and is a dial type. The switch 25 is operated when the passenger seat temperature is individually selected, and is a push type. The switch 26 is for adjusting the temperature for the passenger seat and is a dial type.

  The switch 31 is a switch for turning off the air conditioner. The switch 32 is a switch for operating the front defroster. The switch 33 is a rear defroster operating switch. The switches 34 and 35 are air-conditioning air outlet selection switches. The switch 36 is a switch for selecting outside air introduction. The switch 37 is a switch for selecting the inside air circulation. Each of the switches 31 to 37 is a push type.

  FIG. 6 shows an example of a control system of the air conditioning system K. In FIG. 6, UK is a controller (control unit) for an air conditioning system configured using a microcomputer. The controller UK receives signals from the various switches described above, the temperature of the heater core 10 detected by the temperature sensor S0, the outside air temperature detected by the outside air temperature sensor S1, and the inside air temperature sensor S2. An opening sensor 11B for detecting an indoor temperature, a solar radiation state detected in the vehicle interior detected by the solar sensor S3, a signal related to the temperature of the evaporator 8 detected by the temperature sensor S4, and an actual opening of the air mix dampers 11 and 12, A signal from 12B is input. The controller UK is interposed in the power transmission path between the engine and the refrigerant compression compressor in addition to the devices 1, 4, 11 (11A), 12 (12A), 13A to 17A, 18 such as the dampers described above. The compressor clutch 51A (see also FIG. 4) is controlled. The controller UK and the sensors, switches, and devices are connected by a low-speed communication system.

  The controller UK basically sets the target room temperature according to the environmental conditions inside and outside the vehicle detected by the various sensors S0 to S4 and the switch operation state by the occupant, and the actual room temperature becomes the target room temperature. The air-conditioning air blowing amount, air-conditioning air temperature, and selection of the air-conditioning air outlet are optimally controlled.

  The controller UK serving as a low-speed communication system is connected to a high-speed communication system (CAN) via a meter provided on the instrument panel. This high-speed communication system includes a PCM that performs engine control including automatic engine stop and automatic restart, a TCM that performs automatic transmission shift control, a DSC that performs brake control including automatic brake control when the engine is automatically stopped, a door A BCM that performs control around the vehicle body including detection of the open / close state of the vehicle, a keyless control module (indicated by SKE) that performs smart keyless control including detection of misplacement of the key in the vehicle, and an EHPAS that performs power steering control are included. Information on the idling stop state is input from the PCM to the controller UK, while an idling stop permission signal or prohibition signal is output from the controller UK to the PCM according to the air conditioning control state, as will be described later. It has become. Further, a vehicle speed sensor S10 is connected to the DSC, and a vehicle speed signal detected by the vehicle speed sensor S10 is input to the controllers UK and PCM via CAN.

  FIG. 7 shows a detailed control system example related to PCM that performs control related to idling stop. In FIG. 7, signals from various sensors or switches S10 to S19 are input to the PCM. The sensor S11 is an accelerator sensor that detects the accelerator opening. The sensor S12 is a throttle sensor that detects the throttle opening. The sensor S13 is an angle sensor that detects the rotational angle position of the crankshaft. The sensor S14 is an intake air temperature sensor that detects the intake air temperature. The sensor S14 is a water temperature sensor that detects the cooling water temperature. The sensor S16 is a negative pressure sensor that detects negative pressure in a brake device having a negative pressure booster. The switch S17 is a brake switch that detects that the brake pedal is depressed (also used as a stop light switch). The sensor S18 is a range position sensor that detects the range position of the automatic transmission. S19 is a battery sensor that comprehensively detects the charge amount, voltage, current consumption, and the like of the battery.

  The PCM controls various devices 41 to 47 as described below in connection with the automatic engine stop (idle stop) and automatic restart control. That is, 41 is an actuator that drives the throttle valve, and is fully closed when the engine is automatically stopped. A drive motor 42 in the electric variable valve timing device delays the opening / closing timing of the intake valve in preparation for automatic restart when the engine is automatically stopped. 43 is a fuel injection valve, and the fuel injection is cut when the engine is automatically stopped. 44 is an ignition coil. When the engine is automatically stopped, energization is stopped and ignition is prohibited. A starter motor 45 is driven when the engine is automatically restarted. An alternator 46 reduces the engine speed by increasing the load of the alternator when the engine is automatically stopped. Reference numeral 47 denotes a DC / DC converter, which is controlled to compensate for a reduction in battery power when cranking for automatic engine restart. The PCM receives a signal from a switch S20 that detects whether the roof R is opened or closed (identifies the open state and the closed state).

  An idle stop is performed in which the engine is automatically stopped when the vehicle is stopped. This is executed on condition that one of the idle stop prohibiting conditions described later is not satisfied.

Automatic stop prohibition condition (idle stop prohibition condition)
(1) When the vehicle speed is not zero.
(2) When the brake operation by the passenger is not performed.
(3) When the accelerator pedal is depressed.
(4) In relation to the battery, when the voltage is a low voltage equal to or lower than a predetermined voltage, when the charge amount is equal to or lower than a predetermined charge amount, when the current consumption is equal to or higher than a predetermined current, or battery control When the system is abnormal (when an abnormal signal occurs).
(5) When the steering angle is not within a predetermined small steering angle range from the neutral position.
(6) In relation to the transmission, a transmission abnormality signal is generated when the transmission is not in the D range position, the oil temperature is not within the predetermined temperature range, or the hydraulic pressure is not within the predetermined pressure range. When there is an abnormality in the clutch (including the lock-up clutch).
(7) In relation to the engine, when the cooling water temperature is not in the predetermined temperature range, when the intake air temperature is too high, or when the atmospheric pressure is low.
(8) When the brake negative pressure in the brake device including the negative pressure booster is insufficient, or when an abnormal signal of the engine system is generated.
(9) When the ignition key is taken out of the vehicle (in the case of a smart keyless entry system), when the seat belt is removed, when any door is open, When the hood is open.
(10) When the inclination angle of the road surface is large.
(11) When an automatic stop prohibition signal is output from the air conditioning controller UK. This will be described in detail later.

  The automatic stop prohibition condition described above is merely an example, and other prohibition conditions may be added. For example, when the IS switch S5 for canceling (prohibiting) the automatic engine stop by the driver's intention is turned on, the engine speed is set to a preset speed (a much higher speed than the idling speed when the engine is stable). ) When the rotation speed is higher than the above, a condition such as the above may be further added. On the contrary, it is also possible to set such that a part of the prohibition condition is deleted.

  The automatic restart start condition for automatically restarting the engine from the idle stop state in which the engine is automatically stopped can be set as when any one of the above automatic stop prohibition conditions is canceled. It is preferable to set the automatic restart condition when the brake operation by the occupant is released.

  Next, automatic stop prohibition conditions related to the air conditioning system K will be described. First, the automatic control of air conditioning is controlled so that the actual room temperature detected by the inside air temperature sensor S2 approaches the target room temperature set based on the temperature adjustment dials 22 and 26 selected by the occupant. In this air conditioning automatic control, the temperature of the conditioned air, the selection of the outlet, the amount of the conditioned air blowout, etc. are automatically controlled.

  In the following cases, the air conditioning controller UK outputs a prohibition signal for prohibiting automatic engine stop when the vehicle is stopped in order to prioritize air conditioning. The air conditioning controller UK outputs an automatic stop permission signal when it does not output the automatic stop prohibition signal.

Automatic stop prohibition condition from the air conditioning system side (1) When abnormality of various sensors in the air conditioning system K occurs.
(2) When the outside air temperature is extremely high (for example, 40 ° C. or more) or extremely low (for example, −10 ° C. or less).
(3) When a defroster is used (priority is given to ensuring visibility).
(4) When the room temperature selected by the occupant is the upper limit on the high temperature side (when the heating request is extremely strong).
(5) The room temperature selected by the occupant is the lower limit value on the low temperature side and the air conditioner is operating (when the cooling request is extremely strong).
(6) When the deviation between the target room temperature and the actual room temperature is larger than a predetermined value.
(7) When the temperature of the evaporator 5 becomes equal to or higher than a preset upper limit temperature during engine automatic stop due to idle stop.

  The air conditioning controller UK performs air conditioning control even when the engine is automatically stopped when the automatic stop prohibition condition is not satisfied.

  When the roof is opened, the temperature control of the evaporator 5 is different from that when the roof is closed in order to lengthen the period of automatic engine stop by idle stop when the roof is closed, and this point will be described below. To do. Note that the temperature of the evaporator 5 can be set to a certain fixed temperature during traveling, but in the embodiment, for example, the temperature is variably controlled according to the target blowing temperature, the outside air temperature, or the like.

  First, a plurality of temperature sensors S4 shown in FIG. 6 for detecting the temperature of the evaporator 5 described above are distributed over a wide range of the evaporator 5 (in the embodiment, as shown in FIG. 8). 9). FIG. 8 is a view of the evaporator 5 as viewed from the flow direction of the conditioned air, and the conditioned air is assumed to flow in the direction perpendicular to the paper surface of FIG.

  As described above, a plurality of (many) temperature sensors S4 are arranged to detect temperatures individually for various parts because the temperature of the evaporator 5 varies considerably depending on the part. . In other words, it is for preventing the temperature from becoming lower than the temperature at which the frozen odor is locally generated, or preventing the temperature from being higher than the temperature at which the dry odor is locally generated. That is, when temperature control of the evaporator 5 is performed, the lower limit temperature for preventing freezing on the low temperature side is controlled based on the lowest temperature among the temperatures detected by the plurality of temperature sensors S4 (freezing). Odor prevention). Similarly, in order to prevent a dry odor, the upper limit temperature on the high temperature side is controlled based on the highest temperature among the temperatures detected by the plurality of temperature sensors S4. Note that when the evaporator 5 is in a normal temperature range during travel where dry odor and frozen odor are not a problem, the C temperature of the evaporator 5 is fed back according to the temperature detected by the temperature sensor S4 provided in the center of the evaporator 5. Be controlled.

  Next, the temperature control of the evaporator 5 will be described in relation to the automatic stop and automatic restart of the engine due to idle stop. First, before the time point t1, the engine is driven (a state in which the engine automatic stop by the idle stop is prohibited by a request from the engine side), and the engine automatic stop by the idle stop is from the air conditioning control side. A permission signal is output. At this time, when the roof is opened, the temperature is controlled to be relatively lower than that when the roof is closed. For example, when the roof is closed, the temperature detected by the central temperature sensor S4 in the temperature sensor S4 shown in FIG. 8 is controlled to be in the range of 3 ° C. to 4 ° C. (when the temperature is 3 ° C. or lower, the evaporator 5 The cooling compressor 50 is turned off, and the compressor 50 is turned on when the temperature reaches 4 ° C. or higher). Further, when the roof is opened, the temperature is controlled to be in a range of 0.5 ° C. to 10 ° C. (When any one of the plurality of temperature sensors S4 detects 0.5 ° C. or less, the compressor 50 is turned off, When any one of the temperature sensors S4 detects 1 ° C. or higher, the compressor 50 is turned ON).

  At the time t1, the engine is in a state of automatic engine stop by idle stop on the engine side, and since the engine automatic stop permission signal by idle stop has already been output from the air conditioning control side, the engine is automatically stopped. Even if the engine is automatically stopped, the air conditioning control (cooling) is executed, but the temperature of the evaporator 5 at which cooling by the engine cannot be expected is gradually increased.

  When the temperature of the evaporator 5 rises to reach a preset upper limit temperature, an idle stop prohibition signal is output from the air conditioning control side, and the engine is automatically restarted. The elapsed time until the upper limit temperature is reached is a time point t2 when the roof is closed, and a time point t3 that is later than the time point t2 when the roof is opened. In other words, when the roof is opened, the engine automatic stop period is secured longer than when the roof is closed. It is not preferable to continue air conditioning control for a long period of time when the temperature of the evaporator 5 has risen, although it is not preferable in terms of sufficiently satisfying the passenger's air conditioning needs. Therefore, even if the engine automatic stop period is extended, it is unlikely that the passenger will feel uncomfortable.

  FIG. 10 is a flowchart focusing on the temperature control of the evaporator 5 described above. This flowchart will be described below. In the following description, Q is a step.

  First, after signals from various sensors are read in Q1, it is determined in Q2 whether or not a prohibition condition for automatic engine stop based on the outside air temperature is satisfied. When the determination in Q2 is YES, in Q8, the normal drive control corresponding to when the roof is closed is performed for the compressor 50. That is, in Q8, the temperature of the evaporator 5 is controlled so as to be in a relatively high temperature range (for example, 3 ° C. to 4 ° C.).

  If the determination in Q2 is NO, it is determined in Q3 whether or not the outside air temperature is equal to or higher than a predetermined temperature (for example, 20 ° C.). If the determination in Q3 is NO, it is determined that there is no request for cooling (cool air), and the process proceeds to Q8.

  When the determination in Q3 is YES, the blowing temperature TAO is calculated in Q4. The required blowing temperature is calculated based on at least one or both of a set vehicle interior temperature and a vehicle interior temperature manually set by the occupant.

  After Q4, at Q5, it is determined whether or not the required blowing temperature TAO is equal to or lower than a predetermined temperature (for example, 15 ° C.). If the determination in Q5 is NO, the process proceeds to Q8. If YES in Q5, it is determined in Q6 whether the roof is open. When the determination in Q6 is NO (that is, when the roof is closed), the process proceeds to Q8.

  When the determination in Q6 is YES, in Q7, the compressor 50 is subjected to drive control corresponding to when the roof is opened. That is, in Q7, the temperature of the evaporator 5 is controlled so as to be in a relatively low temperature range (for example, 0.5 ° C. to 1 ° C.).

  Here, when the roof is opened, the change to drive control of the evaporator 5 to be in a low temperature range (for example, 0.5 ° C. to 1 ° C.) is performed when the vehicle is predicted to stop (that is, due to idle stop). (When an automatic engine stop is predicted). The prediction of the stop of the vehicle is based on the information that the next traffic light will soon be changed to red display (for example, use of road-to-vehicle communication, etc.), and at a low speed when the vehicle speed is lower than a predetermined vehicle speed (for example, 20 km / h). When deceleration is detected, or when it is detected that the preceding vehicle has stopped based on information from a camera or radar, this can be done by an appropriate method.

  When executing an automatic engine stop by idling stop, a predetermined delay time (for example, 2 to 3 seconds) is set, and the evaporator 5 is controlled to rapidly become a low temperature during this delay time. You may make it perform an engine automatic stop later. In this case, since the temperature of the evaporator 5 is lowered in a state where it is confirmed that the engine automatic stop by the idle stop is surely performed, it is possible to prevent a situation where the temperature of the evaporator 5 is unnecessarily lowered. Is preferable.

  In a vehicle having an automatic transmission, when deceleration of the vehicle is detected during cooling when the roof is opened, the gear ratio is higher than the gear shift pattern when the roof is closed (the gear ratio that increases the deceleration). The shift pattern may be changed. By setting it as a high gear ratio, an engine speed is raised and the cooling effect | action of the evaporator 5 by the compressor 50 can fully be improved. In particular, it is preferable in terms of energy regeneration during deceleration by actively driving the compressor 50 so that the evaporator 5 is at a low temperature while maintaining a high gear ratio.

  Although the embodiment has been described above, the present invention is not limited to the embodiment, and can be appropriately changed within the scope described in the scope of claims. For example, the invention includes the following cases. . The roof opening / closing type vehicle is not limited to a vehicle that can select full open, but may be a vehicle in which a part of the roof is opened or closed, such as a Targa top type vehicle or a sunroof type vehicle. When the engine is automatically stopped when the roof is open, the direction of the air-conditioning wind may be directed only to the upper body of the occupant (especially the face), and when the occupant is only in the driver's seat, the passenger seat The side outlet may be closed, and only the driver side outlet may be opened. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  The present invention is suitable for air conditioning control of a vehicle in which the roof is opened and closed and the engine is automatically stopped.

UK: Controller (for air conditioning control)
EG: Engine K: Air conditioning system S4: Temperature sensor (for detecting evaporator temperature)
S20: Sensor (for roof open / close detection)
4: Blower fan 5: Evaporator 10: Heater core 11: Air mix damper 11A: Motor (actuator)
11B: Opening sensor 12: Air mix damper 12A: Motor (actuator)
12B: Opening sensor 50: Compressor 55: Condenser 60: Water pump

Claims (6)

A vehicle air conditioning control device for a vehicle having a roof that can be opened and closed,
An air conditioner equipped with an evaporator for air conditioning cooled by an engine as a drive source;
An evaporator temperature detecting means for detecting the temperature of the evaporator;
Evaporator temperature control means for controlling the evaporator temperature detected by the evaporator temperature detection means to be a predetermined temperature;
The engine is automatically stopped when an idle stop condition including a vehicle stop is satisfied, and when the temperature detected by the evaporation temperature detecting means is equal to or higher than the upper limit temperature set higher than the predetermined temperature, the engine is automatically stopped. Idle stop control means for performing restart,
A predetermined temperature changing means for changing the predetermined temperature to a lower temperature when the roof is open than when the roof is closed;
A vehicle air-conditioning control device comprising: In claim 1,
The vehicle air conditioning control device, wherein the predetermined temperature is set to a temperature at which the freezing degree of the evaporator does not rise above a predetermined value. In claim 1 or claim 2,
The vehicle air conditioning control apparatus, wherein the upper limit temperature is set to a temperature lower than a temperature at which a dry odor is generated. In any one of Claims 1 thru | or 3,
A stop prediction means for predicting the stop of the vehicle,
The predetermined temperature changing means changes the predetermined temperature to a lower temperature when the roof is opened, on condition that the stop prediction of the vehicle is predicted by the stop prediction means.
A vehicle air-conditioning control device. In any one of Claims 1 thru | or 3,
When the roof is opened, the idle stop control means automatically stops the engine after a predetermined time elapses from the time when the vehicle is stopped, while the predetermined temperature changing means is operated until the predetermined time elapses from the time when the vehicle is stopped. The vehicle air-conditioning control apparatus is characterized in that the predetermined temperature is changed to a low temperature during the period. In any one of Claims 1 thru | or 5,
The vehicle has an automatic transmission that performs a shift based on a predetermined shift pattern;
Shifting pattern changing means for changing the shift pattern to a higher gear ratio than when the roof is closed when cooling is detected when the roof is opened and when the vehicle is decelerated, is further provided.
A vehicle air-conditioning control device.

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