JP3591960B2 - Automotive air conditioning control system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control system for an air conditioner for a vehicle, and more particularly to a control system having a shared control program applicable to a water temperature sensor of an analog type or a digital type.
[0002]
[Prior art]
Generally, an auto air conditioner for a vehicle is provided with a means for detecting an engine cooling water temperature (for example, a water temperature sensor). In consideration of the engine cooling water temperature detected by the water temperature sensor, for example, an external air temperature sensor value process and a flow rate at the time of startup are performed. Control and the like are performed.
[0003]
The specifications of the water temperature sensor are roughly classified into an analog type and a digital type. Conventionally, a control amplifier suitable for each specification is provided for each specification.
[0004]
[Problems to be solved by the invention]
However, in such a conventional system, since a dedicated amplifier is provided for each specification of the water temperature sensor, the number of types of components (amplifiers) increases, and the cost for product management increases.
[0005]
In order to eliminate such inconvenience, it is necessary to provide a control amplifier that can support both analog and digital specifications.However, if both specifications are simply combined, it is necessary to connect a digital water temperature sensor. Even when the air conditioner is activated, the digital data is not determined when the air conditioner is started, and as a result, the analog processing is prioritized. For example, there is a possibility that the low water temperature processing may be performed in the outside air temperature sensor value processing or the start-up air volume control. is there. Once the low water temperature process is started, the process is continued to some extent, which may impair the air conditioning feeling at the beginning of startup. Therefore, conventionally, the sharing of the control amplifier has been abandoned, and the control amplifier has been provided according to each specification as described above.
[0006]
The present invention has been made by paying attention to the above-mentioned problem in inputting the engine cooling water temperature, and is a shared vehicle air conditioner that can be applied to analog specifications and digital specifications without impairing the air conditioning feeling at the beginning of startup. The purpose of the present invention is to provide a control system.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a control system for an air conditioner for a vehicle according to the present invention includes an air conditioner for a vehicle having a control means (6) which can be connected to a water temperature detecting means (4) of either an analog type or a digital type. The control means (6) executes the control state set by the analog water temperature value at the time of startup until the time required for determining the digital water temperature value elapses, and determines the digital water temperature value. After the required time has elapsed, a digital water temperature value is input, and when it is equal to or higher than a predetermined temperature, the control state set by the analog water temperature value is canceled. As described above, by providing a common control means for the analog specification and the digital specification, it is not necessary to provide control means for each specification.
[0009]
Further, at the time of activation, the control means cancels the control state set by the analog water temperature value by inputting the digital water temperature value and when it is equal to or higher than the predetermined temperature until the time required for determining the digital water temperature value elapses. I'm supposed to. Thereby, even if the digital water temperature detecting means is connected, when the digital water temperature value is determined and it is equal to or higher than the predetermined temperature (high water temperature), the processing is immediately switched to the high water temperature processing, and set at the time of startup. Since the performed low water temperature processing is not continued thereafter, the air conditioning feeling at the initial stage of startup is not impaired.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a control system of a vehicle air conditioner according to one embodiment of the present invention.
This control system includes, for example, an inside air sensor 1 for detecting the temperature of the cabin air, an outside air sensor 2 for detecting the outside air temperature, and a solar radiation sensor 3 for detecting the amount of solar radiation, as in a general automotive air conditioner. A water temperature sensor 4 as a water temperature detecting means for detecting the temperature of the engine cooling water, and switches 5 (for example, an A / C switch, a fan switch, a mode switch, a temperature control switch, a REC switch, and a DEF) provided on a control panel. Switches, etc.), and these sensors 1 to 4 and each switch 5 are connected to an auto amplifier 6 as control means. The auto amplifier 6 has a built-in microcomputer, and its memory (ROM) 7 stores a control program. In the present invention, the water temperature sensor 4 can be arbitrarily connected to either an analog type or a digital type, and the control program in the auto amplifier 6 is shared and used for both types as described later. It is configured to be compatible.
[0011]
The auto amplifier 6 includes, for example, an air mix door actuator 8 for opening and closing the air mix door, a fan control amplifier 9 for controlling the applied voltage of the blower fan motor 10, and a mode door (vent door, foot door, differential door). A mode door actuator 11 that opens and closes, an intake door actuator 12 that opens and closes an intake door, and a compressor control circuit 13 that controls ON / OFF of a compressor 14 are connected. The auto amplifier 6 operates signals of the sensors 1 to 4 and the switches 5 according to the stored control program, and operates the actuators 8, 11, 12, the fan control amplifier 9, and the compressor control circuit 13. Then, the air-conditioning state (air temperature, air volume, outlet position, inlet position, etc.) in the vehicle compartment is automatically controlled.
[0012]
As described above, when the analog specification and the digital specification are shared for the water temperature sensor, there is a problem that the analog takes precedence at the time of startup. However, as a countermeasure, the present invention determines the digital water temperature value at the time of startup. Does not control the system at all until the time required for the elapse of time (measure 1), or cancels the control state set by the analog water temperature value in a predetermined case until the time required for determining the digital water temperature value elapses (Countermeasure 2)
[0013]
FIG. 2 is a flowchart illustrating the operation of the auto amplifier 6 that implements the measure 1, and FIG. 3 is a flowchart illustrating the operation of the auto amplifier 6 that implements the measure 2. 4 is a flow chart showing the contents of the outside air sensor value processing in the input data processing in FIGS. 2 and 3, and FIG. 5 is a flow chart showing the contents of the start-up air flow control in the air flow control in FIGS. 2 and 3. It is. Both the outside air sensor value processing and the start-up air flow control are control items that take into account the engine cooling water temperature.
[0014]
First, the operation of the auto amplifier 6 for implementing the measure 1 will be described with reference to FIG. When the user sets the ignition (IGN) from the OFF state to the ON state and starts the system (step S1), a built-in timer is started (step S2), and it is determined whether or not a digital water temperature signal is input within a predetermined time. A judgment is made (step S3, step S4). The input terminal of the auto amplifier 6 is provided with a terminal to which the water temperature sensor 4 of the analog specification is connected and a terminal to which the water temperature sensor 4 of the digital specification is connected. The input of the digital water temperature signal determined in step S3 is provided. The presence / absence is determined by checking the presence / absence of an input to the digital water temperature sensor 4 terminal. Further, the predetermined time counted in step S4 is set to a time required for determining the digital water temperature value (for example, about 300 msec).
[0015]
If the digital water temperature signal is not input within a predetermined time (about 300 msec), it is determined that the analog water temperature sensor 4 is connected, and the analog water temperature sensor 4 terminal (analog water temperature signal) is referred to. Then, the analog input is processed to detect the water temperature (analog water temperature processing) (step S5). On the other hand, if the digital water temperature signal is input within a predetermined time (about 300 msec), it is determined that the digital water temperature sensor 4 is connected, and the digital water temperature sensor 4 terminal (digital water temperature signal) is connected. ), The digital input is processed to detect the water temperature (digital water temperature processing) (step S6).
[0016]
Then, after the time (approximately 300 msec) required to determine the digital water temperature value has elapsed and the analog input or the digital input has been determined as described above, the general automatic air-conditioner shown in steps S7 to S12 is first displayed. Start control. That is, at the time of startup when the ignition is turned on, the control of the system is not performed at all until the time required for determining the digital water temperature value (about 300 msec) has elapsed.
[0017]
In the input data processing of step S7, an outside air sensor value process for correcting the outside air temperature, a solar sensor value process for correcting the solar radiation amount, and the like are performed. The outside air temperature correction is performed so that when the temperature detected by the outside air sensor 2 suddenly rises due to the influence of heat of the radiator or the like, the temperature recognized by the auto amplifier 6 slowly rises. In the case where the amount of solar radiation suddenly changes, for example, when entering or exiting a tunnel, correction is made so that the amount of solar radiation recognized by the auto amplifier 6 changes slowly.
[0018]
In the outside air sensor value processing, as shown in FIG. 4, the engine cooling water temperature is considered. First, in the initial setting, it is determined whether or not the water temperature is low (for example, less than 56 ° C.) based on the detection value of the water temperature sensor 4 (step S41). If the result of this determination is that the water temperature is low, it is determined that the external air sensor 2 does not have the thermal influence of the radiator, etc., and the input value (A / D converted value) of the external air sensor 2 is directly used as the calculation data. Then, when the water temperature is high (for example, 56 ° C. or higher), the outside air sensor 2 determines that the radiator is affected by heat or the like, and uses the memory value as calculation data (step S43). ). The outside air temperature calculation data set in step S42 or step S43 is subjected to a slope process (for example, about 0.2 ° C./min) as necessary (step S44), and then provided to a predetermined calculation process. .
[0019]
In the present invention, at the time of startup when the ignition is turned on, the system is not controlled at all until the time required for determining the digital water temperature value (about 300 msec) elapses. In some cases, the step S42) is not performed, and the slope processing (step S44) is not performed.
[0020]
The reference value for determining whether or not the water temperature is low can be freely set in consideration of how the engine warms up, but is usually set to about 50 to 56 ° C.
[0021]
In the blowout air temperature control in step S8, arithmetic processing is performed based on the set temperature, signals from the sensors, and the like to determine a target air mix door opening. Then, the target air mix door opening is compared with the current air mix door opening, and the air mix door actuator 8 is controlled so that the optimum air mix door opening is always obtained.
[0022]
In the air volume control in step S9, when the target temperature is set, arithmetic processing is performed based on signals from the sensors to determine the target air volume. Then, the voltage applied to the blower fan motor 10 is controlled via the fan control amplifier 9 so as to achieve the target air volume. In addition to such normal air volume control, automatic air volume control includes startup air volume control performed only at startup. In general, in the air volume control, the manual selection position of the fan switch is prioritized.
[0023]
In the start-up air flow control, as shown in FIG. 5, the engine cooling water temperature is considered. That is, when the automatic control of the air volume is started, particularly when the outlet is in a predetermined mode (for example, FOOT, D / F, B / L) and the engine cooling water temperature is low (less than 56 ° C.) (step S51). , Step S52) In order not to blow cold air to the feet, the voltage applied to the blower fan motor 10 is gently increased (for example, about 0.34 V / min) (low water temperature start air volume control) (Step S54). In other cases, the applied voltage to the blower fan motor 10 is gradually increased (for example, about 1 V / min) to prevent a sudden blow of strong wind (starting air flow control) (step S53). .
[0024]
In the present invention, when the ignition is turned on, the system is not controlled at all until the time required for determining the digital water temperature value (about 300 msec) elapses. (The slope is gentler than the starting air volume control in step S53).
[0025]
In the outlet control in step S10, the mode door position is basically selected according to the blowout air temperature calculated in step S8, and the mode door actuator 11 is controlled so as to be at the obtained position. Note that, here, generally, a manual selection position of a mode switch or a DEF switch is prioritized.
[0026]
In the suction port control in step S11, basically, the suction port position is selected according to the blowout air temperature calculated in step S8, and the intake door actuator 12 is controlled so as to be at the obtained position. Here, generally, the operation of the REC switch is prioritized.
[0027]
In the compressor control of step S12, ON / OFF control of the compressor 14 is performed via the compressor control circuit 13 by a predetermined switch operation.
[0028]
Then, the processing of steps S7 to S12 is repeated until the operation of the system is terminated by turning off the ignition (IGN) (step S13).
[0029]
Next, the operation of the auto amplifier 6 that implements the countermeasure 2 will be described with reference to FIG. When the ignition (IGN) is set from the OFF state to the ON state by the user and the system is started (step S21), the built-in timer is started and the flag F is reset to 0 (step S22). After that (step S23), general control of the automatic air conditioner shown in steps S24 to S29 is performed. The flag F indicates a state as to whether or not a predetermined time has elapsed, which will be described later. “0” indicates a state before the predetermined time has elapsed, and “1” indicates a state after the predetermined time has elapsed. Note that the processing of steps S24 to S29 is the same as the processing of steps S7 to S12 in FIG. 2, and a description thereof will be omitted.
[0030]
At this time, if the water temperature sensor 4 of the analog specification is actually connected, the correct water temperature is detected, so that is all right. However, if the water temperature sensor 4 of the digital specification is connected, the actual analog input is not detected. Since it is not present, it is always recognized as a low water temperature, and enters the state of low water temperature processing (steps S41 and S42) and slope processing (step S44) based on it in the outside air sensor value processing of FIG. In the air volume control, the flow enters the state of the low water temperature start air volume control (step S54) with a gentler slope. If the water temperature is actually high, the control state at this time will be inaccurate.
[0031]
The state set in the analog water temperature process is repeated until a predetermined time elapses (steps S30 and S31) unless the operation of the system is finished (step S37). The predetermined time counted in step S31 is set to the time required for determining the digital water temperature value (for example, about 300 msec).
[0032]
When a predetermined time (about 300 msec) has elapsed, the value of the flag F is set to 1 (step S32), and it is determined whether a digital water temperature signal has been input (step S33). If the result of this determination is NO, it is determined that the water temperature sensor 4 of the analog specification is connected, and a series of controls (steps S24 to S29) are continuously performed by analog water temperature processing, and the operation of the system is terminated. (Step S30, Step S37).
[0033]
On the other hand, if the result of the determination in step S33 is YES, it is determined that the digital water temperature sensor 4 is connected, and the digital water temperature processing is switched (step S34), and the detected water temperature is set to the high water temperature. (56 ° C. or higher) is determined (step S35).
[0034]
If the result of this determination is NO, the state set in the previous analog water temperature process is continued, but if YES, the previous state is wrong, and the once set state is cancelled. Is performed (step S36). That is, at the time of starting when the ignition is turned on, the control state set by the analog water temperature value is canceled when the time required for determining the digital water temperature value (approximately 300 msec) elapses when a high water temperature digital water temperature value is input. . Specifically, the state of the low water temperature processing (steps S41 and S42) set in the outside air sensor value processing of FIG. 4 and the state of the slope processing (step S44) based on the low water temperature processing are cancelled. The state of the low water temperature startup air volume control (step S54) set in step is canceled. Then, a series of controls (Steps S24 to S29) are repeatedly performed based on the detected digital water temperature until the operation of the system is completed (Steps S30 and S37).
[0035]
Therefore, according to each of the above-described embodiments, the auto amplifier 6 that can be connected to the water temperature sensor 4 of either the analog specification or the digital specification is configured. As a result, the number of parts (amplifiers) can be reduced, and an increase in product management costs can be avoided.
[0036]
According to the first embodiment (measure 1), at the time of startup when the ignition is turned on, the time required for determining the digital water temperature value (about 300 msec) elapses as an analog priority measure when the amplifier is shared. Since the system control is not performed at all, the external air sensor value processing (see FIG. 4) and the starting air volume control (see FIG. 5) do not enter an erroneous state due to the analog priority at the time of starting. The air conditioning feeling is not impaired. In this case, the system is not controlled at all for a certain period of time after activation, but since it is a very short time (about 300 msec), it does not affect the user's feeling at all.
[0037]
Further, according to the second embodiment (measures 2), when the ignition is turned on, the control state set by the analog water temperature value until the time required for determining the digital water temperature value (about 300 msec) elapses, If the digital water temperature value of the high water temperature is input, it is canceled, so even if the external air sensor value processing (see FIG. 4) or the starting air volume control (see FIG. 5) enters an erroneous state due to analog priority at startup. Even if it happens, it will be canceled immediately when the digital water temperature value of the high water temperature is input, and the erroneous state once set will not be continued after that, and the air conditioning feeling at the beginning of startup will not be impaired . In the present invention, an erroneous control state may be entered for a certain period of time after activation, but since this is also a very short time (about 300 msec), it hardly affects the user's feeling.
[0038]
【The invention's effect】
Since the present invention is as described above, the following effects can be obtained.
In the control system of the air conditioner for a vehicle according to the present invention, since the control means which can be connected to both the analog specification and the digital specification water temperature detection means is provided, it is not necessary to provide the control means corresponding to each specification. Therefore, the number of types of parts can be reduced, and an increase in cost for product management can be avoided.
[0039]
Then, as an analog priority measure when the control means is shared, at the time of startup, the system is not controlled until the time required for determining the digital water temperature value elapses, so that the digital specification water temperature detection means is connected. Even if it is, the low water temperature processing is not determined by the analog water temperature processing before the digital water temperature value is determined at the time of startup, and the time required to determine the digital water temperature value is extremely short, The air conditioning feeling at the beginning of the startup is not impaired.
[0040]
In addition, at the time of startup, the control state set by the analog water temperature value before the time required for determining the digital water temperature value elapses, for example, by inputting the digital water temperature value and canceling when the digital water temperature value is equal to or higher than the predetermined temperature. Even when the digital water temperature detecting means is connected, when the digital water temperature value is determined and is equal to or higher than a predetermined temperature (high water temperature), the process immediately switches to the high water temperature processing, and the low water temperature set at the time of startup is set. Since the processing is no longer continued thereafter, the air-conditioning feeling at the beginning of startup is not impaired.
[Brief description of the drawings]
FIG. 1 is a block diagram of a control system of an automotive air conditioner according to an embodiment of the present invention. FIG. 2 is a flowchart showing an example of the operation of the auto amplifier of FIG. 1. FIG. FIG. 4 is a flowchart showing another example of the outside air sensor value processing in the input data processing of FIGS. 2 and 3; FIG. 5 is a flowchart showing the content of startup air flow control in the air flow control of FIGS. 2 and 3; Flow chart [Explanation of reference numerals]
4: Water temperature sensor (water temperature detection means)
6 ... Auto amplifier (control means)
7 Program memory

Claims (1)

A control system for a vehicle air conditioner having a control means (6) connectable to a water temperature detection means (4) of either an analog specification or a digital specification ,
The control means (6)
At startup, the control state set by the analog water temperature value is executed until the time required to determine the digital water temperature value elapses,
A control system for an automotive air conditioner for inputting a digital water temperature value after a lapse of time required to determine a digital water temperature value and canceling a control state set by an analog water temperature value when the digital water temperature value is equal to or higher than a predetermined temperature .

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