JP2017030376A - Climate control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a climate control device for a vehicle capable of reducing dark current, and improving accuracy of an obtained ambient temperature outside the vehicle, thus raising suitability of control of temperature inside a cabin.SOLUTION: The climate control device for a vehicle includes: ambient temperature measuring means 2 for measuring an ambient temperature value outside the vehicle; storage means 3 for storing an ambient temperature value upon stopping, measured by the ambient temperature measuring means 2 when an engine is stopped; and a timer 4 that is actuated while the engine is stopped. When the engine is stopped while communication is established between an air conditioner ECU 5 and a timer ECU 6, a count value of the timer 4 is cleared. After the engine is restarted while the communication is established, the following determination and process are performed. If the count value of the timer 4 is below a predetermined value, the ambient temperature value upon stopping stored in the storage means 3 is used as an ambient temperature value for climate control, to perform climate control inside a cabin. If the count value of the timer 4 is equal to or above the predetermined value, an ambient temperature value measured at that time is used as the ambient temperature value for climate control.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an air conditioning control device for a vehicle that performs air conditioning control in a vehicle interior.

  The vehicle air conditioning control device that performs air conditioning control in the passenger compartment performs control such as determining the target outlet temperature TAO based on, for example, the set temperature, the outside air temperature, the inside air temperature, the amount of solar radiation, and the like. This target blowout temperature TAO is a vehicle cabin blowout air temperature necessary for maintaining the vehicle cabin temperature at the set temperature set by the occupant. By the way, the outside temperature sensor mounted on the vehicle is often mounted mainly in the vicinity of the front bumper, and when it is arranged at a position that is easily affected by radiant heat from the engine, an accurate outside temperature cannot be obtained. There is a case. For example, when the engine is operated for a long time and then stopped, and then the engine is started again, the engine is not cooled to room temperature when restarting if the engine stop time is short. Furthermore, it is difficult for new air to enter the engine when the engine is restarted. Thus, when the engine stop time is short, the influence of radiant heat from the engine is particularly large, and it is difficult to obtain an accurate outside air temperature. Therefore, it is proposed to correct the outside air temperature detected by the outside air temperature sensor considering the effect of radiant heat from the engine according to the timer time when the engine is restarted, using a timer that operates from when the engine is stopped. (For example, refer to Patent Document 1 and Patent Document 2).

JP 2009-190674 A Japanese Patent Laid-Open No. 11-23375

  However, if the timer is operated in the air conditioning control device (air conditioner ECU) for measuring the engine stop time, the dark current increases while the engine is stopped. Accordingly, the present inventors have developed a device that suppresses an increase in dark current by measuring the engine stop time with an ECU that is always operating even when the engine is stopped, and transmitting the time information to the air conditioner ECU through communication. Reached. However, in this case, the communication start between the ECUs may have a time lag from the start of the engine, and there is a possibility that the timing between the air conditioner ECU and the timer ECU in the normally operating ECU is shifted. For example, when the engine is operated for a short time, the timer ECU is started by stopping the engine, but at the time of starting the engine, the air conditioner ECU may not start communication. When the engine is stopped when communication is not started when the engine is started, the timer ECU clears the timer again and starts timing. Therefore, when the engine is started next time (after a short engine operation), the timer ECU transmits the time measured after the clear, and the air conditioner ECU receives a time different from the originally desired time and uses the value as the outside air temperature. May be corrected. If it does so, the temperature after correction will deviate from actual outside temperature rather than outside temperature measured at the time of restart, and appropriate air-conditioning control may become difficult.

  The present invention solves the above-described problems, and can reduce the dark current (current consumption after the engine is stopped) and more accurately obtain the outside air temperature of the vehicle. It is an object of the present invention to provide a vehicle air conditioning control device that can be adjusted.

In order to achieve the above object, an air conditioning control apparatus for a vehicle according to the present invention is an air conditioning control apparatus for a vehicle that performs air conditioning control in a vehicle interior in accordance with an outside air temperature, and measures an outside air temperature value of the vehicle. Means, storage means for storing an outside air temperature value measured when the engine is stopped by the outside air temperature measuring means, and a timer that operates in an engine stopped state,
The timer clears the count value when the engine is stopped in a state where communication between the air conditioner ECU and the timer ECU is established, and the communication between the air conditioner ECU and the timer ECU is performed when the engine is restarted. When the count value of the timer is less than a predetermined value in the established state, the outside air temperature value at the time of stop stored in the storage means is used as the outside air temperature value for air conditioning control used for air conditioning control in the passenger compartment. When the count value of the timer is greater than or equal to the predetermined value, the outside air temperature value measured at that time is used as the outside air temperature value for air conditioning control.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing a dark current, the external temperature of a vehicle can be acquired more correctly, Therefore The vehicle interior temperature control apparatus which can adjust a vehicle interior temperature more appropriately can be provided. .

FIG. 1 is a schematic configuration diagram of an embodiment of a vehicle air-conditioning control apparatus according to the present invention. FIG. 2 is a flowchart showing the air conditioning control process of the air conditioner ECU in the embodiment. FIG. 2A shows a processing procedure when the engine is stopped, and FIG. 2B shows a processing procedure when the engine is restarted. FIG. 3 is a flowchart showing a timer count process of the timer ECU in the embodiment. FIG. 3A shows a processing procedure when the engine is stopped, and FIG. 3B shows a processing procedure when the engine is stopped.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the schematic configuration diagram of FIG. 1 and the flowcharts of FIGS. However, the present invention is not limited or limited to the following description.

  As shown in FIG. 1, the vehicle air conditioning control device 1 in the present embodiment is mainly composed of an air conditioner ECU (Electronic Control Unit) 5, an outside air temperature sensor 2, a body integrated ECU (timer ECU) 6, and an engine ECU 7. The The temperature in the passenger compartment is controlled by a command from the air conditioner ECU 5. The air conditioner ECU 5, the body integrated ECU 6 and the engine ECU 7 exchange data via CAN (Controller Area Network) communication (in-vehicle LAN). In the present embodiment, CAN communication is used as the communication means. However, the communication means is not limited to CAN communication, and for example, LIN (Local Interconnect Network) communication, FlexRay communication, or the like can be used.

  The outside air temperature sensor 2 is an outside air temperature measuring means, for example, is mounted near the front bumper of the vehicle, measures the temperature of the outside air, and transmits the measured value (outside air temperature value) from the engine ECU 7 to the air conditioner ECU 5. . However, the present invention is not limited to this mode. For example, the outside air temperature value may be directly input to the air conditioner ECU 5.

  The air conditioner ECU 5 includes a memory 3. The memory 3 is a storage unit that can store the outside air temperature value measured by the outside air temperature sensor 2. The memory 3 is a non-volatile storage unit such as a flash memory, for example. The outside air temperature value transmitted as described above is stored in the memory 3.

  The timer ECU 6 is an ECU that does not stop functioning, such as a body integrated ECU that performs vehicle theft prevention control, room lamp control, and the like, and a key-free ECU that collates with a key-free portable device. In this embodiment, an example of a body integrated ECU is shown. In the timer ECU 6, the timer 4 is a timer that operates (counts) when the engine is stopped, and measures (counts) an elapsed time starting from when the engine is stopped (when the ignition switch is OFF). The count value of the timer 4 is cleared when the engine is stopped in a state where CAN communication between the air conditioner ECU 5 and the timer ECU 6 is established, and the count is started after the clear.

  The air conditioner ECU 5 receives the count value (timer count value) of the timer 4 as timer information from the body integrated ECU 6 by CAN communication. Then, it is determined whether or not the timer count value is equal to or greater than a predetermined value, and it is determined which value is used as the outside air temperature value for air conditioning control used for air conditioning control in the passenger compartment. More specifically, when the engine is stopped (when the ignition switch is OFF), the stop outside air temperature value measured by the outside air temperature sensor 2 is stored in the memory 3, and the timer count value is less than a predetermined value (engine stop) When the elapsed time from the time is short), the outside air temperature value at the time of stop stored in the memory 3 is used as the outside air temperature value for air conditioning control used for air conditioning control in the passenger compartment. On the other hand, when the timer count value is equal to or greater than the predetermined value (when the elapsed time from the engine stop is long), the outside air temperature value measured at that time is used as the outside air temperature value for air conditioning control.

  Next, the air conditioning control process of the air conditioner ECU 5 will be described with reference to the flowchart of FIG.

  FIG. 2A is a flowchart showing a processing procedure when the engine is stopped. This control process starts when the engine is stopped. When the engine is stopped, the ignition switch can be switched from ON to OFF. However, the present invention is not limited to this. For example, when an engine speed sensor is provided, the engine is measured according to the measured value of these sensors. A stop may be determined. When the engine is stopped, first, the outside air temperature value at the time of the engine stop is read and stored in the memory 3 in step S10. Then, in the next step S20, the power supply of the air conditioner ECU 5 is turned off, and the process of FIG.

  FIG. 2B is a flowchart showing a processing procedure when the engine is restarted. This control process starts when the stopped engine is restarted. When the engine is restarted, the ignition switch can be switched from OFF to ON. However, the present invention is not limited to this. For example, when an engine speed sensor is provided, the measured values of these sensors are used. An engine restart may be determined. When the engine is restarted, first, in step S30, the outside air temperature value at the time of engine stop stored in the memory 3 is read.

  Next, in step S40, it is determined whether CAN communication between the air conditioner ECU 5 and the body integrated ECU (timer ECU) 6 is established. If the CAN communication is established, the process proceeds to step S50, and the current outside air temperature value is acquired by CAN communication. Next, in step S60, the timer count value obtained by the timer 4 is acquired from the body integrated ECU 6 by CAN communication, and in step S70, the CAN communication establishment flag is turned ON.

  Next, in step S80, it is determined whether or not the timer count value acquired in step S60 is greater than or equal to a predetermined value. Here, the predetermined value is a value such that the radiant heat caused by the previous engine operation decreases with the passage of time corresponding to the timer count value, and the influence on the measured value of the outside air temperature sensor 2 is reduced. Good. The predetermined value can be calculated based on factors such as the set temperature of the air conditioner, the outside air temperature, the inside air temperature, and the amount of solar radiation. For example, in the winter season, since the outside air temperature is low and the engine is rapidly cooled, the predetermined value is a small value.

  When the timer count value is equal to or greater than the predetermined value (when the elapsed time from the engine stop is long), the process proceeds to step S90, and the current outside air temperature value acquired in step S50 is used for air conditioning control in the vehicle interior. As the outside air temperature value Tam, the process of FIG.

  On the other hand, when the timer count value is less than the predetermined value (when the elapsed time from the engine stop is short), the process proceeds to step S100, and the outside air temperature value at the time of engine stop read in step S30 is used as the air conditioning in the passenger compartment. The processing in FIG. 2B is terminated as the air-conditioning control outside air temperature value Tam used for the control.

  If the CAN communication has not been established in step S40, the process proceeds to step S110, the CAN communication establishment flag is turned OFF, and the process of FIG.

  Next, the timer count process of the body integrated ECU (timer ECU) 6 will be described with reference to the flowchart of FIG.

  FIG. 3A is a flowchart showing a processing procedure when the engine is stopped. This control process starts when the engine is stopped. When the engine is stopped, first, in step S200, it is determined whether the CAN communication establishment flag is ON. If the CAN communication establishment flag is ON, the process proceeds to step S210, the count value of the timer 4 is cleared (elapsed time timer after engine stop), and the process of FIG.

  On the other hand, if the CAN communication establishment flag is OFF, the processing of FIG. That is, if the engine is stopped before the CAN communication is started because the engine has been operating for a short time, the timer count value is not cleared even if the engine is stopped. carry out. In a short-time operating state where the engine is stopped between the engine operation and the start of CAN communication, the influence on the radiant heat of the engine is small. In such a case, since the influence of the radiant heat resulting from the previous engine operation should be taken into consideration, such processing is performed.

  FIG. 3B is a flowchart showing a processing procedure when the engine is stopped. If the engine is stopped, the timer count of the elapsed time after engine stop is incremented in step S220, and the process of FIG.

  As described above, in the vehicle air-conditioning control apparatus according to the present invention, the CAN communication is established after the engine is started, and when a predetermined time has passed since the engine stop after that, the engine caused by the engine operation The air conditioning control is performed based on the (current) outside air temperature value at that time without considering the influence of the radiant heat. Further, when the predetermined time has not elapsed, the air conditioning control is performed based on the outside air temperature value when the engine is stopped in consideration of the influence of the radiant heat. Also, the timer count can be controlled by clearing or incrementing the timer count from the presence or absence of establishment of CAN communication and determining the timer start time for the predetermined time. As described above, according to the present invention, the dark current (current consumption after the engine is stopped) can be reduced, and the outside air temperature of the vehicle can be acquired more accurately, so that the vehicle interior temperature can be adjusted more suitably. A vehicle air conditioning control device can be provided.

DESCRIPTION OF SYMBOLS 1 ... Vehicle air-conditioning control apparatus 2 ... Outside temperature sensor (outside temperature measuring means)
3 Memory (storage means)
4 ... Timer 5 ... Air conditioner ECU
6 ... Timer ECU (Body integrated ECU)
7: Engine ECU

Claims (1)

A vehicle air-conditioning control device that controls the air-conditioning of the passenger compartment according to the outside air temperature,
An outside air temperature measuring means for measuring the outside air temperature value of the vehicle,
Storage means for storing an outside air temperature value at the time of stopping measured by the outside air temperature measuring means when the engine is stopped;
A timer that operates when the engine is stopped,
The timer is cleared when the engine is stopped in a state where communication between the air conditioner ECU and the timer ECU is established,
In a state where communication between the air conditioner ECU and the timer ECU is established in an engine restart state,
When the count value of the timer is less than a predetermined value, the outside air temperature value at the time of stop stored in the storage means is used as an outside air temperature value for air conditioning control used for air conditioning control in the passenger compartment.
When the count value of the timer is equal to or greater than the predetermined value, an outside air temperature value measured at that time is used as the outside air temperature value for air conditioning control.

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