JP4428090B2 - Vehicle control device - Google Patents

Description

  The present invention belongs to a technical field related to a vehicle control device including an air conditioning control device and an automatic stop unit that automatically stops the engine of the vehicle when the vehicle is stopped.

  Conventionally, for the purpose of improving fuel consumption and reducing exhaust gas, it is well known that when a vehicle stops due to a signal or the like, the engine of the vehicle is automatically stopped (idling stop). This vehicle usually heats the air blown into the vehicle interior of the vehicle by heat exchange with a heat pump (engine coolant or refrigerant) supplied from a water pump or compressor as an auxiliary machine driven by the engine. An air conditioning control device having a heat exchanger (heater core or evaporator) for cooling is provided.

  In a vehicle equipped with an air conditioning control device as described above, if the engine is automatically stopped during operation of the air conditioning control device, the auxiliary air is also stopped, and thus the heating air is sufficiently heated or cooled by the heat medium. The air conditioning control performance will be reduced. For this reason, when the operation switch (blower switch) of the air conditioning control device is in the ON state, it is conceivable that the engine is not automatically stopped. However, in this case, the air conditioning control device is in the operating state. In many cases, therefore, the engine is hardly stopped automatically, and the effects of improving fuel consumption and reducing exhaust gas are hardly obtained.

Therefore, for example, as shown in Patent Document 1, when the cooling request and the automatic engine stop overlap, the drive of the compressor is stopped and the drive of the compressor is not resumed until a predetermined period elapses. Or when the difference between the target vehicle interior temperature set by the passenger and the actual vehicle interior temperature exceeds a predetermined threshold, the drive of the compressor is restarted. It has been proposed to be able to meet the cooling requirements of passengers while obtaining an exhaust gas reduction effect.
JP 2000-179374 A

  However, in Patent Document 1, although the frequency at which the engine automatically stops increases, the operation of the air-conditioning control device is temporarily stopped. When the difference between the vehicle interior temperature and the actual vehicle interior temperature is quite large, it becomes difficult to quickly bring the vehicle interior temperature close to the target vehicle interior temperature, which causes discomfort to the passengers. Even if the compressor is restarted when the difference between the target passenger compartment temperature set by the occupant and the actual passenger compartment temperature is greater than a predetermined threshold, the threshold is set. However, if the threshold is too small, the compressor will be restarted immediately, which will not improve fuel efficiency or reduce exhaust gas. On the other hand, if the threshold is too large, the compressor will be restarted. The passengers feel uncomfortable.

  The present invention has been made in view of such points, and the object of the present invention is to automatically stop the engine when the vehicle is stopped in the vehicle having the air conditioning control device as described above. An object of the present invention is to increase the frequency at which the engine automatically stops when the vehicle is stopped while maintaining the air conditioning control performance at a high level so as not to give the passengers as much discomfort as possible.

In order to achieve the above object, according to the present invention, a value related to the blast air heating or cooling capacity of the heat medium is detected, and the detected value is predetermined when the vehicle is stopped and the air conditioning control device is operating. When the condition is satisfied, the engine is automatically stopped for a predetermined period, and when the outside air temperature is within a predetermined range, the predetermined period is set to a certain period, or the target vehicle interior temperature and the vehicle interior temperature are On the other hand, when the outside air temperature is outside the predetermined range, the predetermined period is set based on the difference between the target vehicle interior temperature and the vehicle interior temperature. I made it to be a period .

  Specifically, in the invention of claim 1, a heat exchanger that heats or cools the air blown into the vehicle interior of the vehicle by heat exchange with a heat medium supplied from an auxiliary machine driven by the engine of the vehicle. The present invention is directed to a vehicle control device including an air-conditioning control device and an automatic stop unit that automatically stops the engine when the vehicle stops.

And an air-conditioning capability detection means for detecting a value related to the blowing air heating or cooling capability of the heat medium, an outside air temperature detection means for detecting the outside air temperature around the vehicle, and a vehicle for detecting the temperature inside the vehicle. An indoor temperature detecting means and a target vehicle interior temperature setting means for setting a target vehicle interior temperature of the vehicle, wherein the automatic stop means is when the vehicle is stopped and the air conditioning control device is operating. The engine is automatically stopped for a predetermined period when the detected value by the air conditioning capability detecting means satisfies a predetermined condition, and when the outside air temperature detected by the outside air temperature detecting means is within a predetermined range, the predetermined period When the outside air temperature is outside the predetermined range, the predetermined period is set to the target vehicle interior set by the target vehicle interior temperature setting means. It is assumed to be configured to the period set based on the difference between the detected passenger compartment temperature by degrees and the passenger compartment temperature detecting means.

With the above configuration, the air-conditioning capacity detection means detects values related to the heating air cooling or heating capacity of the heat medium (the temperature of the engine cooling water, the refrigerant discharge pressure by the compressor, etc.), and these detection values satisfy a predetermined condition. Sometimes, the automatic stop means automatically stops the engine for a predetermined period. Thus, the engine can be automatically stopped while the air conditioning control device is operated, and the air conditioning control performance can be maintained at a high level even if the engine is automatically stopped. That is, the predetermined condition is that the temperature of the engine cooling water is equal to or higher than the predetermined temperature or the discharge pressure of the refrigerant is equal to or higher than the predetermined pressure. Alternatively, by setting the cooling capacity to a level that can be maintained at a certain level, it is possible to suppress the deterioration of the air conditioning control performance due to the automatic engine stop and maintain the performance at a high level. On the other hand, it is possible to prevent discomfort. In addition, when a certain amount of time has elapsed from the start of the engine, the detected value normally satisfies a predetermined condition, and the frequency of automatic engine stop can be increased .

Furthermore, when the outside air temperature is outside the predetermined range, the difference between the target vehicle interior temperature and the actual vehicle interior temperature is usually large. Therefore, the predetermined period that is the engine stop period is set to a period that considers the air conditioning control performance as much as possible. It can be set, and it can prevent a passenger from feeling uncomfortable. On the other hand, when the outside air temperature is within the predetermined range, the engine can be surely stopped for a certain period of time, so that an improvement in fuel consumption and an effect of reducing exhaust gas can be reliably obtained.

According to a second aspect of the present invention, there is provided an air conditioning control device having a heat exchanger for heating or cooling air blown into the vehicle interior of the vehicle by heat exchange with a heat medium supplied from an auxiliary machine driven by the vehicle engine. An air-conditioning capability detection unit that detects a value related to the air blowing or heating capability of the heat medium, targeting a vehicle control device including an automatic stop unit that automatically stops the engine when the vehicle is stopped; an outside air temperature detection means for detecting the outside air temperature around the vehicle, and the vehicle interior temperature detection means for detecting the vehicle interior temperature of the vehicle, and the target passenger compartment temperature setting means for setting a target vehicle interior temperature of the vehicle the provided, the automatic stop means, during the operation of the stop and and the air conditioner control apparatus for a vehicle, when the detected value is the predetermined condition is satisfied by the air-conditioning capacity detecting means, the engine With automatically stopping a predetermined period, when the outside air temperature detected by the outside air temperature detecting means is within a predetermined range, the predetermined time period, a period of time, the set target vehicle compartment by the target passenger compartment temperature setting means while the temperature and duration of adding a duration that is set based on the difference between the passenger compartment temperature detected by the passenger compartment temperature detecting means, when said outside air temperature is outside the predetermined range, the predetermined time period, the It is assumed that the period is set based on the difference between the target vehicle interior temperature set by the target vehicle interior temperature setting means and the vehicle interior temperature detected by the vehicle interior temperature detection means.

Thus, the same effect as that of the invention of claim 1 can be obtained, and when the outside air temperature is within the predetermined range, the engine stop period can be made as long as possible within the range in which the air conditioning control performance is not deteriorated. The improvement effect of exhaust gas and the reduction effect of exhaust gas can be further enhanced.

In the invention of claim 3, in the invention of claim 2 , the automatic stop means is configured to limit the predetermined period to a maximum period set in accordance with the outside air temperature detected by the outside air temperature detecting means. Shall.

  That is, only one sensor or the like, which is a vehicle interior temperature detecting means for detecting the vehicle interior temperature, is provided on the instrument panel, and it is difficult to accurately detect the vehicle interior temperature. . Therefore, as in the present invention, by limiting the predetermined period to the maximum period or less set according to the outside air temperature, even if there is only one sensor or the like, it is possible to reliably suppress a decrease in air conditioning control performance. Can do.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the heat medium is engine cooling water supplied from a water pump as an auxiliary machine, and the air conditioning capability detecting means is a fan of the heat medium. The engine cooling water temperature is detected as a value related to air heating or cooling capacity, and the automatic stop means is configured such that the temperature of the engine cooling water detected by the air conditioning capacity detection means is equal to or higher than a predetermined temperature. It is assumed that the engine is automatically stopped only for a predetermined period when the predetermined condition is satisfied.

  As a result, if the temperature of the engine cooling water is equal to or higher than the predetermined temperature, even if the engine is stopped for a predetermined period, the blowing air heating capability of the engine cooling water can be maintained at a certain level. In addition, if the temperature of the engine cooling water is equal to or higher than a predetermined temperature, it can normally be estimated that the refrigerant discharge pressure by the compressor is equal to or higher than the predetermined pressure. The blowing air cooling capacity can be maintained at a certain level.

According to a fifth aspect of the present invention, in any one of the first to third aspects of the present invention, the heat medium is a refrigerant supplied from a compressor as an auxiliary machine, and the air-conditioning capability detection means is configured to heat the air blown by the heat medium or The refrigerant discharge pressure by the compressor is detected as a value related to the cooling capacity, and the automatic stop means is such that the refrigerant discharge pressure detected by the air conditioning capacity detection means is equal to or higher than a predetermined pressure. As a predetermined condition, it is assumed that the engine is automatically stopped only for a predetermined period when the predetermined condition is satisfied.

  Thus, if the discharge pressure of the refrigerant is equal to or higher than a predetermined pressure, the cooling air cooling capacity of the refrigerant can be maintained at a certain level even if the engine is stopped for a predetermined period.

As described above, according to the vehicle control device of the present invention, the value related to the air blowing or heating capacity of the heat medium is detected, and the value is detected when the vehicle is stopped and the air conditioning control device is operating. When the value satisfies a predetermined condition, the engine is automatically stopped for a predetermined period, and when the outside air temperature is within a predetermined range, the predetermined period is set to a predetermined period, or the target vehicle interior temperature is On the other hand, when the outside air temperature is outside the predetermined range, the predetermined period is determined based on the difference between the target vehicle interior temperature and the vehicle interior temperature. by which is adapted to set the period Te, while preventing discomfort to passengers while maintaining the air-conditioning control performance at a high level, it is possible to increase the frequency of the automatic stop of the engine.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a control apparatus for a vehicle according to an embodiment of the present invention. The control apparatus includes an air-conditioning control apparatus 1 and a stop of the vehicle (in this embodiment, in addition to stopping the vehicle, an automatic transmission is further provided. The vehicle control unit 2 as an automatic stop means for automatically stopping the engine of the vehicle when the select lever is in the neutral range or the parking range and the brake pedal is depressed), and the engine ignition device 4 And an engine control unit 3 for controlling the fuel injection device 5 and the like.

  The air conditioning control device 1 includes a blower that blows air into the passenger compartment of the vehicle, a heater core that heats the blown air, and an evaporator that cools the blown air. Yes. The heater core is supplied with engine cooling water as a heat medium from a water pump as an auxiliary machine driven by the engine so that the blown air is heated by heat exchange with the engine cooling water in the heater core. It has become. On the other hand, the evaporator is supplied with a refrigerant as a heat medium from a compressor 6 as an auxiliary machine driven by the engine via a condenser or the like, and the blown air is cooled by heat exchange with the refrigerant in the evaporator. It has become so.

  The air conditioning control device 1 has an air conditioner control unit 11 that controls various actuators (described later) based on input information from various operation switches and sensors (described later) operated by the occupant.

  As an operation switch operated by the occupant, an air conditioner switch 12 for operating the compressor 6, a blower switch 13 for operating the blower to blow air into the vehicle interior, and a target vehicle interior temperature are set. Temperature control switch 14 serving as a target vehicle interior temperature setting means (the temperature set by the passenger using the temperature control switch 14 becomes the target vehicle interior temperature), and the blowout air outlet (a vent air outlet, a defroster air outlet, etc.) ) And an air conditioner priority switch 16 for preventing the engine from being automatically stopped by giving priority to the air conditioning control. The blower switch 13 is a switch for operating the air conditioning control device 1. When the blower switch 13 is in the ON state, the air conditioning control device 1 is operating.

  As the above-mentioned sensor, an inside air sensor 21 (only one is provided on the instrument panel) as a vehicle interior temperature detecting means for detecting the vehicle interior temperature of the vehicle, and an outside air temperature detecting means for detecting the outside air temperature around the vehicle. An outside air sensor 22, a solar radiation sensor 23 that detects the intensity of sunlight (a solar heat load), an evaporator sensor 24 that detects an evaporator temperature, and a water temperature sensor 25 that detects the temperature of engine cooling water are provided.

  The actuator includes a blower motor 31 that operates the blower, and an air mix actuator that adjusts the opening of the opening by a damper provided in the opening that guides a part of the blown air cooled by the evaporator to the heater core. 32 and a mode actuator 33 for switching the air outlet by operating a plurality of dampers respectively provided at the air outlets of the blown air according to the mode switch 15 and a damper for switching the intake air inside / outside air And an inside / outside air actuator 34 for operating the.

  The compressor 6 is provided with a clutch for mechanically connecting or disconnecting the compressor 6 with respect to the engine. The operation of the clutch is controlled by the air conditioner control unit 11 via the engine control unit 3. Is done. That is, when the air conditioner control unit 11 determines that the compressor 6 needs to be operated, the compressor ON signal is transmitted to the engine control unit 3, and the engine control unit 3 receives the compressor ON signal and puts the clutch into a connected state. .

  Then, the air conditioner control unit 11 includes the air mix actuator 11 and the like so that the vehicle interior temperature (actual vehicle interior temperature) detected by the interior air sensor 21 becomes the target vehicle interior temperature set by the temperature control switch 14. To control.

  The vehicle control unit 2 includes an inhibitor switch 41 that detects which shift range position the select lever operated by the occupant is in, a vehicle speed sensor 42 that detects the vehicle speed of the vehicle, and a brake that detects the depression of the brake pedal. Each information from the switch 43 is input, and the air conditioner switch 12, the blower switch 13, the temperature control switch 14, the air conditioner priority switch 16, the inside air sensor 21, the outside air sensor 22, and the water temperature sensor 25 are inputted via the air conditioner control unit 11. Each information from is input.

  The vehicle control unit 2 detects that the vehicle has stopped (the vehicle speed detected by the vehicle speed sensor 42 is 0), and the inhibitor switch 41 detects that the select lever is positioned in the neutral range or the parking range and brakes. When the depression operation of the brake pedal is detected by the switch 43, that is, when the engine automatic stop condition is satisfied and the air conditioning control device 1 is operating (the blower switch 13 is in the ON state), the heat medium When the value related to the blown air heating or cooling capacity satisfies a predetermined condition (in this embodiment, the temperature Tw of the engine coolant detected by the water temperature sensor 25 is equal to or higher than the predetermined temperature Tw0), the engine is operated for a predetermined period. It is designed to stop automatically (however, the automatic stop condition is met before the predetermined period has elapsed). When no longer terminates the automatic stop at that point). When the vehicle control unit 2 automatically stops the engine, a stop signal is transmitted to the engine control unit 3 to make the ignition device 4 and the fuel injection device 5 inoperative.

  On the other hand, even if the automatic stop condition is satisfied, if the value related to the heating air cooling or cooling capacity of the heat medium does not satisfy the predetermined condition (the engine cooling water temperature Tw is lower than the predetermined temperature Tw0), the engine A stop signal is not transmitted to the control unit 2 and the engine is not automatically stopped. If the air-conditioning control device 1 is not operating when the automatic stop condition is satisfied, the engine is automatically stopped and the engine is automatically stopped until the automatic stop condition is not satisfied.

  Here, the temperature Tw of the engine cooling water is a value related to the blowing air heating capacity of the engine cooling water (the higher the engine cooling water temperature Tw, the higher the blowing air heating capacity). The air-conditioning capacity detecting means for detecting a value related to the blowing air heating capacity of the heat medium is configured. And the said predetermined temperature Tw0 is set to the temperature (for example, 65 degreeC) which can maintain the ventilation air heating capability of engine cooling water to a certain high level even if an engine stops for the said predetermined period. In this embodiment, the temperature Tw of the engine cooling water also serves as a value related to the blowing air cooling capacity of the refrigerant, and the water temperature sensor 25 detects the value related to the blowing air cooling capacity of the heat medium. Means are also configured. That is, if the engine cooling water temperature Tw is equal to or higher than the predetermined temperature Tw0, a certain amount of time has elapsed since the engine was started, and if the compressor 6 is operating during that time, refrigerant discharge by the compressor 6 is performed. It can be estimated that the pressure is equal to or higher than a predetermined pressure (a pressure at which the blowing air cooling capacity of the refrigerant can be maintained at a certain level even if the engine is stopped for the predetermined period). Therefore, if the temperature Tw of the engine cooling water is equal to or higher than the predetermined temperature Tw0, both the ability to heat and cool the blown air of the heat medium can be maintained at a certain level even if the engine is stopped for a predetermined period.

  In addition, when the air pressure capability detection means is provided with a pressure sensor that detects the discharge pressure of the refrigerant by the compressor 6 and the blown air is cooled, the discharge pressure of the refrigerant detected by the pressure sensor is equal to or higher than a predetermined pressure. When the engine is automatically stopped for a predetermined period and the blown air is heated, the engine is automatically stopped for a predetermined period when the temperature of the engine cooling water is equal to or higher than the predetermined temperature. Also good.

  Further, in this embodiment, the vehicle control unit 2 is configured such that the outside air temperature Ta detected by the outside air sensor 22 when the air conditioning controller 1 is in operation and the engine coolant temperature Tw is equal to or higher than the predetermined temperature Tw0. When it is within the first predetermined range, the predetermined period is set to a period obtained by adding a variable period t2 to a predetermined period t1 (for example, 10 seconds), and the engine is automatically stopped for the period (t1 + t2). The variable period t2 is a period set based on the difference between the target vehicle interior temperature set by the temperature control switch 14 and the actual vehicle interior temperature detected by the internal air sensor 21, and the target vehicle interior temperature and the actual vehicle temperature are set. The larger the difference from the room temperature, the shorter the period should be (see FIG. 4). The predetermined period may be a certain period only. However, the fixed period in this case is preferably larger than the fixed period when the variable period is added as described above.

  On the other hand, when the air-conditioning control device 1 is operating and the temperature Tw of the engine coolant is equal to or higher than the predetermined temperature Tw0, when the outside air temperature Ta is outside the first predetermined range, the predetermined period is set to the variable period t2. As a result, the engine is automatically stopped only during the period t2. However, in this embodiment, when the outside air temperature Ta is outside the first predetermined range and within the second predetermined range (a range including the first predetermined range and wider than the first predetermined range), the predetermined temperature is set. Only the variable period t2 is set as the period, and the engine is automatically stopped only during the period t2. That is, when the air-conditioning control device 1 is operating and the engine coolant temperature Tw is equal to or higher than the predetermined temperature Tw0, the engine is automatically stopped only for a predetermined period when the outside air temperature Ta is within the second predetermined range. become.

  In addition, the predetermined period is a period obtained by adding the variable period t2 to the fixed period t1 or only the variable period t2, and the maximum period tmax set according to the outside air temperature Ta (see FIGS. 2 and 3). ) Limited to:

  An example of the relationship between the outside air temperature Ta and a predetermined period (automatic stop period) is shown in FIGS. 2 and 3 (FIG. 2 shows a case where both the air conditioner switch 12 and the blower switch 13 are ON, and FIG. The air conditioner switch 12 is OFF and the blower switch 13 is ON). FIG. 4 shows an example of the relationship between the difference between the target vehicle interior temperature and the actual vehicle interior temperature and the variable period t2. In this example, when both the air conditioner switch 12 and the blower switch 13 are ON, the first predetermined range is 5 ° C. (ta3) or more and 30 ° C. (ta2) or less, and the second predetermined range is 0 ° C. (ta4) or more. When the temperature is 37.5 ° C. (ta1) or less and the outside air temperature is outside the second predetermined range, the engine is not automatically stopped. When the air conditioner switch 12 is OFF and the blower switch 13 is ON, the first predetermined range is 5 ° C. (ta3) to 20 ° C. (ta0) and the second predetermined range is 0 ° C. (ta4). When the temperature is 20 ° C. (ta0) or less and the outside air temperature is less than 0 ° C. (ta4), the engine is not automatically stopped as in the case where both the air conditioner switch 12 and the blower switch 13 are ON. When ta0) is exceeded, the engine is automatically stopped when the automatic stop condition is satisfied, and the engine is automatically stopped until the automatic stop condition is not satisfied.

  A specific control operation of the vehicle control unit 2 will be described with reference to the flowcharts of FIGS. This control starts when the ignition switch is turned on.

  First, in step S1, information from various switches and sensors is input, and in the next step S2, it is determined whether or not an automatic stop condition is satisfied. If the determination in step S2 is NO, the process returns to step S1. If the determination in step S2 is YES, the process proceeds to step S3.

  In step S3, it is determined whether or not the blower switch 13 is ON. When the determination in step S3 is NO, the process proceeds to step S4, where the engine is automatically stopped, and in the next step S5, it is determined whether or not the automatic stop condition is not satisfied, and the determination in step S5 is NO. When the determination is YES, the processing operation of step S5 is repeated. When the determination is YES, the process proceeds to step S6 to end automatic stop (start the engine), and then returns.

  On the other hand, when the determination in step S3 is YES, the process proceeds to step S7 to determine whether the air conditioner priority switch 16 is ON. When the determination in step S7 is YES, the process returns to step S1, while when the determination in step S7 is NO, the process proceeds to step S8.

  In step S8, it is determined whether or not the temperature Tw of the engine coolant is equal to or higher than a predetermined temperature Tw0. When the determination in step S8 is NO, the process returns to step S1, while when the determination in step S8 is YES, the process proceeds to step S9.

  In step S9, it is determined whether the air conditioner switch 12 is ON. If the determination in step S9 is NO, the process proceeds to step S10. If the determination in step S9 is YES, the process proceeds to step S14. .

  In step S10, it is determined whether or not the outside air temperature Ta is higher than Ta0 (corresponding to 20 ° C. in FIG. 3). If the determination in step S10 is YES, the process proceeds to step S11 to automatically stop the engine. In the next step S12, it is determined whether or not the automatic stop condition is not satisfied. When the determination in step S12 is NO, the process returns to step S10, while when the determination in step S12 is YES, Proceeding to step S13, the automatic stop is terminated, and then the process returns. On the other hand, when the determination in step S10 is NO, the process proceeds to step S16.

  In step S14 that proceeds when the determination in step S9 is YES, it is determined whether or not the outside air temperature Ta is higher than Ta1 (corresponding to 37.5 ° C. in FIG. 2), and the determination in step S14 is YES. If there is, the process returns to step S1, while if the determination in step S14 is NO, the process proceeds to step S15.

  In step S15, it is determined whether or not the outside air temperature Ta is higher than Ta2 (corresponding to 30 ° C. in FIG. 2). If the determination in step S15 is NO, the process proceeds to step S16 while the determination in step S15 is performed. When YES is determined, the process proceeds to step S19.

  In step S16 that proceeds when the determination in step S10 or S15 is NO, it is determined whether or not the outside air temperature Ta is equal to or higher than Ta3 (corresponding to 5 ° C. in FIGS. 2 and 3). Is YES, the process proceeds to step S17 to set the fixed timer t1, and then proceeds to step S19. On the other hand, if the determination in step S16 is NO, the process proceeds to step S18.

  In step S18, it is determined whether or not the outside air temperature Ta is equal to or higher than Ta4 (corresponding to 0 ° C. in FIGS. 2 and 3). If the determination in step S18 is NO, the process returns to step S1. If the determination in step S18 is yes, the process proceeds to step S19.

  In step S19, the variable timer t2 is set based on the difference between the target vehicle interior temperature and the actual vehicle interior temperature (see FIG. 4), and in the next step S20, the maximum period tmax is set according to the outside air temperature Ta ( 2 and 3).

  In the next step S21, it is determined whether or not the value of t1 + t2 (t1 is 0 when not passing through step S17) is greater than tmax. If the determination in step S21 is YES, Proceeding to S22, the total timer tset is set to tmax in order to count the predetermined period, and then proceeding to step S24. On the other hand, when the determination in step S21 is NO, the process proceeds to step S23 and the total timer tset is set to t1 + t2. Then, the process proceeds to step S24.

  In step S24, the engine is automatically stopped. In the next step S25, the timer is counted. In next step S26, it is determined whether or not the count time t is longer than tset.

  When the determination in step S26 is NO, the process proceeds to step S27 to determine whether or not the automatic stop condition is not satisfied. When the determination in step S27 is NO, the process returns to step S25, while step When the determination in S27 is YES, the process proceeds to step S28, the automatic stop is terminated, and then the process returns.

  On the other hand, when the determination in step S26 is YES, the process proceeds to step S29, the automatic stop is terminated, and in the next step S30, it is determined whether or not the automatic stop condition is not satisfied. Is NO, the processing operation of step S30 is repeated, and when it is YES, the process returns.

  When the automatic stop condition is satisfied by the control of the vehicle control unit 2, the engine is automatically stopped if the blower switch 13 is OFF, and the automatic stop is terminated when the automatic stop condition is not satisfied. That is, since the air conditioning control device 1 is not operating, the engine is automatically stopped until the automatic stop condition is not satisfied.

  When the air conditioner priority switch 16 is ON when the blower switch 13 is ON, or when the engine coolant temperature Tw is lower than the predetermined temperature Tw0 even when the air conditioner priority switch 16 is OFF, the engine Does not stop automatically. That is, when the air-conditioning control device 1 is operating, the engine is not automatically stopped when the occupant does not want to stop automatically or when the air-conditioning control performance deteriorates when the automatic stop is performed.

  On the other hand, when the blower switch 13 is ON and the air conditioner priority switch 16 is OFF and the engine coolant temperature Tw is equal to or higher than the predetermined temperature Tw0, the outside air temperature Ta is within the second predetermined range ( If the air conditioner switch 12 is ON, the engine is automatically stopped for a predetermined time on condition that Ta4 or more and Ta1 or less, and if the air conditioner switch 12 is OFF, Ta4 or more and Ta0 or less. This predetermined time is when the outside air temperature Ta is within the first predetermined range (when the air conditioner switch 12 is ON, it is when Ta3 or more and Ta2 or less, and when the air conditioner switch 12 is OFF, When Ta3 or more and Ta0 or less), it is a period obtained by adding a variable period t2 (determined by the difference between the target vehicle interior temperature and the actual vehicle interior temperature) to the constant period t1, and the outside air temperature Ta is outside the first predetermined range. And when it is within the second predetermined range (when the air conditioner switch 12 is ON, it is when Ta4 or more and Ta3 or less or Ta2 or more and Ta1 or less, and when the air conditioner switch 12 is OFF, Ta4 or more and Ta3 In the following case) only the variable period t2. However, the predetermined period is limited to the maximum period tmax set according to the outside air temperature Ta.

  If the automatic stop condition is not satisfied because the brake pedal is released by the time the predetermined time elapses, the automatic stop ends at that point.

  Therefore, in the above embodiment, the temperature of the engine cooling water is detected as a value related to the blowing air heating and cooling capacity of the heat medium, and the detected temperature is satisfied when the automatic stop condition is satisfied and the air conditioning control device 1 is operating. Is automatically stopped only for a predetermined period when is above a predetermined temperature (a temperature at which the engine cooling water blowing air heating and cooling capacity can be maintained at a certain high level even if the engine is stopped for a predetermined period) Therefore, even if the engine is automatically stopped, the air conditioning control performance can be maintained at a high level, and the passenger can be prevented from feeling uncomfortable. In addition, when a certain amount of time has elapsed from the start of the engine, the temperature of the engine cooling water becomes equal to or higher than the predetermined temperature. Therefore, the frequency of the engine automatic stop can be increased, and fuel consumption can be improved and exhaust gas can be reduced. Fully obtained. In addition, since the predetermined period is set based on the difference between the outside air temperature and the target vehicle interior temperature and the actual vehicle interior temperature, the predetermined period can be made as long as possible, and the effects of improving fuel consumption and exhaust gas are further enhanced. be able to.

  In the above embodiment, the automatic stop means is constituted by the vehicle control unit 2, but is not limited to the vehicle control unit 2, and may be constituted by the air conditioner control unit 11 or the engine control unit 3, or by these plural units. May be.

  The present invention relates to a vehicle including an air conditioning control device having a heat exchanger that heats or cools air blown into a vehicle interior by heat exchange with a heat medium supplied from an auxiliary machine driven by an engine. This is useful when the engine is automatically stopped when the vehicle is stopped.

It is a block diagram which shows the structure of the control apparatus of the vehicle which concerns on embodiment of this invention. It is a figure which shows an example of the relationship between the outside temperature in case both an air-conditioner switch and a blower switch are ON, and a predetermined period (automatic stop period). It is a figure which shows an example of the relationship between external temperature and predetermined period (automatic stop period) when an air-conditioner switch is OFF and a blower switch is ON. It is a figure which shows an example of the relationship between the difference between target vehicle interior temperature and actual vehicle interior temperature, and a variable period. It is a flowchart which shows the first half part of control operation of a vehicle control unit. It is a flowchart which shows the second half part of control operation of a vehicle control unit.

1 Air-conditioning control device 2 Vehicle control unit (automatic stop means)
6 Compressor (auxiliary machine)
14 Temperature control switch (Target vehicle interior temperature setting means)
21 Inside air sensor (vehicle compartment temperature detection means)
22 Outside air sensor (outside air temperature detection means)
25 Water temperature sensor (air conditioning capability detection means)

Claims (5)

An air conditioning control device having a heat exchanger that heats or cools the air blown into the passenger compartment of the vehicle by heat exchange with a heat medium supplied from an auxiliary machine driven by an engine of the vehicle, and when the vehicle stops A vehicle control device comprising automatic stop means for automatically stopping the engine,
Air-conditioning capability detection means for detecting a value related to the blowing air heating or cooling capability of the heat medium;
An outside air temperature detection means for detecting the outside air temperature around the vehicle,
Vehicle interior temperature detecting means for detecting the vehicle interior temperature of the vehicle;
A target vehicle interior temperature setting means for setting the target vehicle interior temperature of the vehicle,
The automatic stop means automatically stops the engine only for a predetermined period when the value detected by the air conditioning capability detection means satisfies a predetermined condition when the vehicle is stopped and the air conditioning control device is in operation. when the outside air temperature detected by the outside air temperature detecting means is within a predetermined range, while the predetermined period is a period of time, when the outside air temperature is outside the predetermined range, the predetermined time period, the target vehicle compartment Vehicle control characterized in that the vehicle is configured to have a period set based on the difference between the target vehicle interior temperature set by the temperature setting means and the vehicle interior temperature detected by the vehicle interior temperature detection means. apparatus. An air conditioning control device having a heat exchanger that heats or cools the air blown into the passenger compartment of the vehicle by heat exchange with a heat medium supplied from an auxiliary machine driven by an engine of the vehicle, and when the vehicle stops A vehicle control device comprising automatic stop means for automatically stopping the engine,
Air-conditioning capacity detection means for detecting a value related to the blowing air heating or cooling capacity of the heat medium;
An outside air temperature detection means for detecting the outside air temperature around the vehicle,
Vehicle interior temperature detecting means for detecting the vehicle interior temperature of the vehicle;
A target vehicle interior temperature setting means for setting the target vehicle interior temperature of the vehicle,
The automatic stop means automatically stops the engine only for a predetermined period when the value detected by the air conditioning capability detection means satisfies a predetermined condition when the vehicle is stopped and the air conditioning control device is in operation. when the outside air temperature detected by the outside air temperature detecting means is within a predetermined range, the predetermined time period, a period of time, the target passenger compartment temperature set by the target vehicle interior temperature setting means and the passenger compartment temperature detecting means while the period plus the period set based on the difference between the detected passenger compartment temperature by setting, when the outside air temperature is outside the predetermined range, the predetermined time period, by the target passenger compartment temperature setting means A period set based on the difference between the set target vehicle interior temperature and the vehicle interior temperature detected by the vehicle interior temperature detection means. Control apparatus for a vehicle according to claim. The vehicle control device according to claim 2 ,
The automatic stop means is configured to limit the predetermined period to a maximum period or less set according to the outside air temperature detected by the outside air temperature detecting means. In the control apparatus of the vehicle as described in any one of Claims 1-3 ,
The heat medium is engine cooling water supplied from a water pump as an auxiliary machine,
The air conditioning capability detection means is configured to detect the temperature of the engine coolant as a value related to the blowing air heating or cooling capability of the heat medium,
The automatic stop means is configured to automatically stop the engine only for a predetermined period when the predetermined condition is satisfied, with the predetermined condition that the temperature of the engine coolant detected by the air conditioning capability detection means is equal to or higher than a predetermined temperature. A control apparatus for a vehicle. In the control apparatus of the vehicle as described in any one of Claims 1-3 ,
The heat medium is a refrigerant supplied from a compressor as an auxiliary machine,
The air conditioning capability detection means is configured to detect the discharge pressure of the refrigerant by the compressor as a value related to the blowing air heating or cooling capability of the heat medium,
The automatic stop means is configured to automatically stop the engine for a predetermined period when the predetermined condition is satisfied, with the predetermined condition that the refrigerant discharge pressure detected by the air conditioning capability detection means is equal to or higher than a predetermined pressure. A control device for a vehicle.

Images