JP2000135915A - Intake door control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve control quality at a low cost by making a correction corresponding to a user's individual preference in an intake control device for controlling opening/closing of an intake door in correspondence with exhaust gas concentration outside a cabin. SOLUTION: This control device is provided with an intake door (a) switched into an outside air mode and an internal air mode by an intake door actuator (g); an exhaust gas concentration computing means (c) for computing exhaust gas concentration on the basis of a sensor signal from an exhaust gas sensor (b); and an intake switching control means (d) for controlling driving of the intake door actuator (g) so as to switch the internal air mode and the outside air mode on the basis of the exhaust gas concentration. In this case, a sensitivity adjusting means (e) is provided to optionally correct the exhaust gas concentration, and the switching control of the intake switching control means (d) can be changed to increase the tendency to switch over to the outside air mode or to increase the tendency to switch over to the internal air mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for detecting the concentration of exhaust gas outside a vehicle compartment, and setting the side to the outside air introduction mode when the outside air is clean, and setting the side to the inside air (circulation) mode when the outside air is contaminated. Belongs to the technical field of door control devices.

[0002]

2. Description of the Related Art Conventionally, as an intake door control device, for example, a device described on pages 149 to 152 of "Academic Lecture Meeting of the Society of Automotive Engineers of Japan, Preprint 975" (issued in October 1997) is known. Are known. In the above conventional source, it is provided at the outside air intake of the air conditioner unit mounted on the car,
An intake door that switches between an outside air mode and an inside air mode by an intake door actuator, an exhaust gas sensor that is installed in a vehicle and detects an exhaust gas concentration of the outside air,
The sensor signal from the exhaust gas sensor is input, and it is determined whether the outside air is in a clean state or a contaminated state based on whether the gas concentration sensor value is equal to or greater than a set threshold value. An apparatus including a control unit that controls the drive of a servomotor that operates the intake door so as to be in the inside air mode in a polluted state is described.

[0003] In the gas sensor used in the above-described intake door control device and air purifier, there are many fluctuation factors such as variations in a single unit, fluctuation due to aging deterioration, and temperature and humidity dependence. ing. Therefore, as a method of correcting such a fluctuation factor, Japanese Patent Application Laid-Open No.
The thing described in 27849 is known. In this conventional correction method, the gas concentration is determined by comparing the sensor value with the value at the time of the clean air value.

[0004]

However, according to the above-mentioned correction method, it is possible to correct the fluctuation factor of the exhaust gas sensor, but it is not possible to correct it according to the user's individual preference. Was. That is, there is an individual difference in smelling the exhaust gas odor, and some people may be worried about even a slight gas odor, while others may not care about the exhaust gas odor at all. When switching to the inside air mode,
The window glass becomes easily fogged and the CO2 concentration in the cabin increases, so some users may endure some gas odors, but even if the window glass becomes cloudy or the CO2 concentration in the cabin increases, Some people can't stand it and want to be in open air mode if possible. However, with the above-described technique, it has not been possible to perform correction according to such individual preferences of the user.

Further, in the above-mentioned conventional intake door control device, when the gas concentration sensor value exceeds a set threshold value, the door control is carried out by the gas concentration correspondence control which brings the intake door from the outside air mode position to the inside air mode position at once. The gas concentration sensor value is used even in situations where the nose of a person feels most smelling, such as when a single odor occurs, such as when a vehicle interrupts in front of the vehicle. If the pressure does not exceed the set threshold, the intake door is not switched to the inside air mode, and there is a problem that the response of the door operation delays and allows exhaust gas to enter the passenger compartment. Therefore, there is a plan to set the set threshold value to a low value of the gas concentration in order to speed up the response of the door closing operation when a single odor occurs. In this case, the recirculation position (by the internal air circulation in ordinary city driving). RE
The frequency of C) becomes extremely high, and the ventilation efficiency in the passenger compartment deteriorates (CO2 concentration increases). In other words, the set threshold value must be set so as to achieve both the prevention of exhaust gas intrusion in the inside air mode and the securing of good ventilation efficiency in the vehicle compartment in the outside air mode, and the degree of freedom in setting is limited to a narrow range. Therefore, changing the set threshold value cannot be a countermeasure for generating a single odor.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the control quality by making it possible to perform correction according to the user's individual preference, and to achieve this at low cost. In addition to achieving this goal, while ensuring good ventilation efficiency without the hassle of frequently entering the door closing control, high response only when really necessary such as when a single odor occurs. A second object is to improve the control quality by switching to the inside air mode.

[0007]

According to the present invention, in order to achieve the above-mentioned object, as shown in the claim correspondence diagram of FIG. An intake door a that can be switched between a mode and an inside air mode, an exhaust gas sensor b that is installed in the vehicle and detects an exhaust gas concentration of outside air, and a sensor signal from the exhaust gas sensor b is input, and based on the sensor signal, Exhaust gas concentration calculating means c for calculating the exhaust gas concentration, and suction switching for controlling the drive of the intake door actuator to switch between the inside air mode and the outside air mode based on the exhaust gas concentration obtained by the exhaust gas concentration calculating means c. And a control means (d) for controlling the exhaust gas concentration. Adjusting means e is provided, characterized by being capable of changing or strengthening the switching tendency of the switching control of the suction switching control means d to the inside air mode or strengthened switching trend to the outside air mode. In the invention according to claim 2,
2. The intake door control device according to claim 1, wherein the exhaust gas concentration calculating means c is configured to calculate an exhaust gas concentration by dividing a sensor value as a sensor signal value by a reference clean air value. And an initial value and a limit value are given to the clean air value, and the sensitivity adjusting means e is
When correcting the exhaust gas concentration, the initial value and the limit value of the clean air value are corrected. Claim 3
In the intake door control device according to the present invention, the exhaust gas concentration calculating means c sets the initial value as a sensor value when the predetermined time has not elapsed after the engine is started. Further, when a predetermined time has elapsed after the engine is started, only when the sensor value exceeds the clean air value, the clean air value is updated, and then the calculation for obtaining the exhaust gas concentration is executed, In the updating process, the sensor value is set to a clean air value when the sensor value does not exceed the limit value, and the limit value is rewritten to the clean air value when the sensor value exceeds the limit value. Further, according to the invention described in claim 4, according to claim 1,
4. The intake door control device according to any one of the first to third aspects, further comprising a memory unit f for holding the correction value by the sensitivity adjusting unit e even when the engine is turned off while the voltage of the power supply of the vehicle is maintained. According to a fifth aspect of the present invention, in the intake door control device according to the first to fourth aspects, the sensitivity adjusting means e may include a sensitivity adjustment switch manually operated and a sensitivity level interlocked with a switch operation. And a display unit for displaying the same. Claim 6
According to the invention described in (5), in the intake door control device according to claim 5, the sensitivity adjustment switch is configured such that a correction value can be set in multiple steps or in a stepless manner. According to a seventh aspect of the present invention, in the intake door control device according to the first to sixth aspects, the exhaust gas concentration calculating means c
A differential value calculating means d1 for calculating a gas concentration differential value which is a change amount per unit time of the exhaust gas concentration obtained in
Based on the gas concentration differential value, the suction switching control means d determines whether the gas concentration state change is in the stable or clean direction or in the dirty direction, and only when the change is in the stable or clean direction, the differential value is already a constant. If the rate of change is greater than or equal to the differential constant set as In addition, the above-described differential control is not performed when the direction is the dirt direction. According to an eighth aspect of the present invention, in the intake door control device according to the seventh aspect, the intake switching control means d is provided with an amount of change per unit time of the exhaust gas concentration obtained by the exhaust gas concentration calculating means c. A differential value calculating means d1 for calculating a certain gas concentration differential value; a first determining means d2 for determining whether the gas concentration state change is in a stable or clean direction or a dirty direction based on the gas concentration differential value; Second determining means d3 for determining whether or not the current gas concentration differential value is equal to or greater than a preset differential threshold value; and first determining means d2 for determining that the previous gas concentration state change was in a stable or clean direction. And when the second determination means d3 determines that the current gas concentration differential value is equal to or greater than a preset differential threshold value, the outside air pollution control unit controls the intake door in the inside air mode direction. A predictive control unit d4, and the provided.

[0008]

(Embodiment 1) Embodiment 1 corresponds to the invention described in all claims.

FIG. 2 is an overall system diagram showing the intake door control device according to the first embodiment. In FIG. 2, 1 is an intake door, 2 is an outside air inlet, 3 is an inside air inlet, 4
Is a deodorizing filter, 5 is a blower, 6 is a blower motor, 7 is a servo motor (corresponding to an intake door actuator in the claims), 8 is an exhaust gas sensor, 9 is a door position sensor, 10 is a vehicle speed sensor, and 11 is an outside air temperature. A sensor, 12 is an air conditioner control unit, 13 is an intake door control unit, 14 is a blower air volume signal, 15 is a compressor signal, and 16 is a mode signal.

The intake door 1 is disposed on the suction side of the blower 5, and is driven by a servomotor 7 as an intake door actuator. Then, the fresh position (FRE) of the intake door 1 that blocks the inside air inlet 3
Then, it becomes 100% of outside air introduction rate, that is, outside air mode,
Conversely, at the recirculation position (REC) of the intake door 1 that blocks the outside air intake port 2, the outside air introduction rate of 0%,
That is, the inside air mode is set. In addition, the intake door 1
A deodorizing filter 4 for preventing exhaust gas odor by activated carbon or the like is arranged between the blower 5 and the blower 5.

The exhaust gas sensor 8 outputs a voltage signal Vs corresponding to the gas concentration by utilizing a change in resistance value due to the presence of gas. That is, the gas sensor element is composed of a gas detection section provided on a ceramic substrate with SnO2 as a main component, and a heater section for performing heating for promoting a reaction to the gas. When reacted, the electrical resistance changes due to the oxidation-reduction reaction. The exhaust gas sensor 8 is installed in a front grille which has a small change in temperature and humidity and can detect exhaust gas with high accuracy and efficiency. By providing the exhaust gas sensor 8 on the upstream side of the intake door 1 as a flow of air and on the front grille portion capable of detecting exhaust gas as quickly as possible.
Exhaust gas can be more reliably prevented from entering the cabin.

The door position sensor 9 detects the door opening position of the intake door 1 and detects the position of the intake door control unit 1.
3 is given door opening feedback information. The vehicle speed sensor 10 detects the vehicle speed Vc and provides vehicle speed information to the intake door control unit 13. The outside air temperature sensor 11
Detects the outside air temperature AMB and gives outside air temperature information to the intake door control unit 13.

The air conditioner control unit 12
Is to detect changes in vehicle interior temperature due to changes in outside temperature, changes in the amount of solar radiation, changes in the number of occupants, etc., and once set to the desired temperature, always keep the vehicle interior temperature constant.
It has a cooling cycle (not shown) and a heating / temperature control unit using engine cooling water, and automatically controls the switching of the outlet air temperature, the outlet air volume, the inlet and the outlet by a microcomputer.

The intake door control unit 13 is one of the control units provided in the air conditioner control unit 12. The exhaust gas sensor 8 detects the state of contamination of the outside air by the exhaust gas, and controls the drive of the intake door 1. Control to automatically switch the suction port. The intake door control unit 13 includes, as internal signals, a blower air volume signal based on a blower motor voltage value, a compressor signal for monitoring on / off of an air conditioner, whether or not a differential mode (DEF) or an automatic recirculation. A mode signal for monitoring whether the mode is an auto REC or not (whether the auto air conditioner control process determines that the load is high) is provided.

Next, the operation will be described. [Regarding Intake Door Control Operation] FIG. 3 is a flowchart showing a flow of the intake door control operation executed by the intake door control unit 13 of the first embodiment. Each step will be described below.

In step 29, a sensitivity adjustment process is performed by a subroutine call based on a user's switch operation described later. In step 30, a gas sensor value process for obtaining a calculation gas sensor value FGSC from a gas sensor A / D value GSAD described later is performed by a subroutine call. In step 31, it is determined whether or not 60 seconds (sufficient time from when the power is turned on until the sensor output stabilizes) have elapsed since the ignition switch was switched from OFF to ON. Before the elapse of 60 seconds, the process proceeds to step 32, where the timer counter of the REC → FRE delay timer is initialized. In step 33, the automatic R for fixing the suction port to the inside air mode (REC) is set.
It is determined whether the mode is the EC mode, and when the auto REC mode is selected, the routine returns without performing the exhaust gas-corresponding intake door control. In step 34, it is determined whether or not the differential mode is selected. When the differential mode is selected, the routine returns without performing the exhaust gas corresponding intake door control.

In step 35, the door opening corresponding to the control characteristic graph-1 shown in FIG. 7 and the calculation gas sensor value FGSC obtained in step 30 is determined, and the delay time Rsec (for example, 20 seconds to 30 seconds) is determined. ) Is set. In a succeeding step 351, it is determined whether or not the calculation gas sensor value FGSC = 0, and FGSC ≠
If FGSC = 0, the process directly proceeds to step 352, and if FGSC = 0, the process proceeds to step 352, where the target door opening FTI = 0.
Then, the process proceeds to step 36. In step 36,
It is determined whether the movement is in the REC → FRE direction, and NO
(When moving from FRE to REC)
The process proceeds to step 39, and if YES (at the time of movement in the REC → FRE direction), the process proceeds to step 39. In step 37, the timer counter of the delay timer is initialized. Step 38
Then, the door opening determined in step 35 is set as the target door opening FTI.

In step 39, it is determined whether or not the delay time Rsec has elapsed. If the delay time Rsec has elapsed, the process proceeds to steps 37 and 38,
Initialization of the timer counter and setting of the target door opening FTI are performed. In step 40, the target door opening FTI is held before the delay time Rsec elapses. However, the continuous time to keep the valve fully closed is up to 1 in consideration of the increase in the CO2 concentration in the vehicle interior.
It is assumed to be within 5 minutes. This continuous time can be controlled in consideration of an increase in the CO2 concentration in the vehicle cabin by, for example, detecting the number of occupants with an occupant sensor and shortening the number as the number of occupants increases. In step 41, a command value for obtaining the target door opening FTI set in step 38 or step 40 is also output to the servomotor 7.

[Sensitivity Adjusting Process] In the present embodiment, based on the operation of the sensitivity adjusting means by the user, a sensitivity adjusting process for strengthening one of the control tendency to the inside air mode and the control tendency to the outside air mode and weakening the other. Execute

FIG. 8 shows the sensitivity adjusting means, which comprises a sensitivity adjusting switch 20 which is manually operated, and a display section 21 which displays the sensitivity level in conjunction with the switch operation. For example, an initial value correction value OIG described later
And the limit value correction value OLG are adjusted in seven levels by a sensitivity adjustment switch 20 provided on an instrument panel in the vehicle cabin. When the display on the display unit 21 is at the position shown in the figure, it indicates that DIG = A1 and OLG = B1 are set.

Next, FIG. 4 is a flow chart of the sensitivity adjustment processing in step 29 of FIG. Step 291
Steps 297 to 297 are steps for judging whether any value from -3 to 3 is set as the sensitivity correction value DGCOST by the sensitivity adjustment switch 20, and the sensitivity correction value DGCOST is a value on the + side. Is higher, the sensitivity is lower as the value on the negative side is higher, and DGCOST = 0 indicates the normal sensitivity which is the initial setting sensitivity.

If the sensitivity correction value DGCOST = 3, then in step 301, the initial value correction value OIG = A3,
The limit value correction value OLG = B3 and the sensitivity correction value D
If GCOST = 2, in step 302, the initial value correction value OIG = A2 and the limit value correction value OLG = B2 are processed. If the sensitivity correction value DGCOST = 1, step 3 is performed.
At 03, the initial value correction value OIG = A1 and the limit value correction value OLG = B1 are processed, and the sensitivity correction value DGCOST = 0.
In step 304, the initial value correction value OIG =
0, the limit value correction value OLG = 0, and if the sensitivity correction value DGCOST = −1, in step 305, the initial value correction value OIG = −A1, the limit value correction value OLG = −
B1 and the sensitivity correction value DGCOST = -2,
In step 306, the initial value correction value OIG = -A2, the limit value correction value OLG = -B2, and the sensitivity correction value D
If GCOST = -3, in step 307, the initial value correction value OIG = -A3 and the limit value correction value OLG = -B
3 and if the sensitivity correction value DGCOST is not any of -3 to 3, in step 308, the initial value correction value O
Processing is performed such that IG = 0 and limit value correction value OLG = 0.

FIG. 5 and FIG. 6 are flowcharts showing the flow of the gas sensor value processing performed by the intake door control unit 13. Steps 50 to 57 are steps for calculating a gas sensor value GSC (0% to 100%) indicating the exhaust gas concentration from the sensor measurement values using the gas sensor A / D value GSAD and the clean air value GSMX. D value GSA
Instead of directly converting D to the gas concentration, the variation, temperature, and humidity characteristics of the sensor alone are corrected by using the clean air value GSMX as a reference value (corresponding to the exhaust gas concentration calculating means c).

In step 50, the gas sensor A / D value GSAD is calculated by the following equation: GSAD = 255-GSAD. The GSAD in the equation is the exhaust gas sensor 8
The gas sensor A / D value obtained by the measurement read in the current processing is subtracted from the value of 255 because the degree of air contamination is represented by 255 bits and the characteristics are inverted. Therefore, the maximum clean air value of the gas sensor A / D value GSAD is 255,
The maximum dirty air value is zero.

In step 51, it is determined whether or not a set time of 60 seconds (sufficient time from when the power is turned on until the sensor output is stabilized) has elapsed since the ignition switch was turned from OFF to ON.
The process proceeds to step 53 if YES. In step 52, a value obtained by adding the initial value correction value OIG to the preset initial value before the elapse of 60 seconds from when the ignition switch is turned on from OFF to ON is set as the gas sensor A / D value GSAD ( This corresponds to the updating process of claim 3). The gas sensor A / D value set in this way is set as an initial value of the clean air value GSMX in step 56 described later. In step 53, turn the ignition switch from OFF to ON
After a lapse of 60 seconds, the gas sensor A / D value GSAD obtained in step 50 is compared with the clean air value GSMX indicating that the air is the cleanest. Here, the clean air value GSMX is a value indicating that the air is the cleanest from the time when the ignition switch is turned on until the previous processing, and is stored in the rewritable RAM.

In step 54, if the determination in step 53 is YES, that is, if GSAD> GSSMS, the gas sensor A / D value GSAD is compared with the limit value of the clean air value GSMX. Here, the clean air value GSMX
Is a predetermined limit value because there is a limit to the value no matter how clean the air is (maximum limit value 255). In step 55, when GSAD> limit value in step 54, the gas sensor A
/ D value GSAD is determined to be an abnormal value, and the value obtained by adding the limit value correction value OLG to the limit value is used as the clean air value GSM.
The memory is stored as X (corresponding to the updating process of claim 3), and the process proceeds to step 56. In step 56, when GSAD ≦ limit value in step 54, it is determined that the gas sensor A / D value GSAD is a normal value, and the gas sensor A / D
The value GSAD is stored as the clean air value GSMX. In step 57, the ratio of the gas sensor A / D value GSAD to the clean air value GSMX, which is the reference value, is set as the gas sensor value (exhaust gas concentration) GSC.

After the initial value correction value OIG used in step 52 of FIG. 5 is set as the gas sensor A / D value GSAD, in step 56 the clean air value GSMX
In step 55, a value obtained by adding the limit value correction value GSAD to the limit value is set as the clean air value GSMX. The clean air value GSMX set in this way is the gas sensor value GS
Since this corresponds to the denominator of the calculation for obtaining C, if the clean air value GSMX is increased even if the gas sensor A / D value, which is the sensor output, is constant, the gas sensor value GSC decreases and the air conditioner enters the inside air mode. The control tendency becomes stronger, and conversely, if the clean air value GSMX is reduced, the gas sensor value GSC
And the tendency to control to the outside air mode becomes stronger. In other words, there are individual differences in the odor, and those who do not mind even if there is a slight odor can avoid fogging of the window glass and increase of CO2 in the passenger compartment by avoiding the inside air mode if possible. However, those who are worried even if they have a slight odor have a demand to control to the inside air mode as much as possible. In contrast,
By increasing or decreasing each of the clean air values GSMX by an external adjustment operation, the tendency of the inside air / outside air mode can be enhanced as described above, and individual differences in odor can be handled. Moreover, since the sensitivity adjusting means is constituted by the sensitivity adjusting switch 20 which is manually operated and the display unit 21 which displays the sensitivity level in conjunction with the switch operation, the sensitivity is adjusted by a simple switch operation while visually recognizing. it can.

In FIG. 6, steps 58 to 6
6 performs a differentiation process of the gas sensor value (exhaust gas concentration) GSC (0% to 100%) obtained in step 57, and determines the final calculation gas sensor value FGSC (0 to 0) to determine the target door opening FTI. (255 bits).

In step 58, it is determined whether the differentiation time ΔAsec has elapsed. In step 59, the previous gas sensor value OGSC and the current gas sensor value G
A GSC differential value DTGS, which is a sensor value change amount per time ΔAsec, is obtained from a difference from the SC.
). In step 60, G
It is determined whether the SC differential value DTGS is greater than 0, that is, whether DTGS> 0.

In step 61, when the determination in step 60 is DTGS ≦ 0, that is, when the gas concentration state change is in a stable or clean direction, the GSC differential value DTGS is set to DTGS = 0. In step 62, when the determination in step 60 is DTGS> 0, that is, when the gas concentration state change is in the dirt direction, whether or not the previous GSC differential value 0 DTGS = 0, that is, when the previous gas concentration state change is It is determined whether the direction is stable or clean (corresponding to a first determination unit). In step 63, it is determined whether or not the GSC differential value DTGS, which is the current gas concentration state change, is equal to or greater than a differential threshold value DGC, which is a set value in the dirt direction (corresponding to a second determining unit).

In step 64, the determination in step 62 that the previous change in the gas concentration state is in the stable or clean direction and the determination in step 63 that the current GSC differential value DTGS is equal to or greater than the differential threshold value DGC. Based on this, the outside air is predicted to shift in the dirt direction, and the gas sensor value GSC is set to GSC = 0, that is, a value that completely closes the intake door 1 (corresponding to outside air dirt prediction control means). In step 65, the GSC differential value DTGS is set to the previous GSC differential value 0DTGS. In step 66, the gas sensor value GSC is set as the calculation gas sensor value FGSC.

[External Air Contamination Prediction Control] When door opening / closing control is performed by the gas concentration control, in a situation where the nose of a person feels the most smell, such as when a single odor is generated due to a vehicle interruption. If the calculation gas sensor value FGSC indicating the gas concentration does not exceed the set threshold value, the intake door 1 will not be fully closed, and the exhaust gas will not enter the cabin due to a delay in the response of the door closing operation. Forgive me.

Therefore, the differential value D of the gas sensor value GSC
It is conceivable to perform control to close the door to the REC only under the present differential value condition that TGS is a value indicating an increase in gas concentration. However, in this case, since the control is performed only with the magnitude of the differential value DTGS of this time, in a combination with a system in which noise easily enters or a gas sensor with an excessively good response, the control is frequently closed to the REC. And it becomes very annoying. In addition, as a result, the execution time for closing to the REC becomes longer, so that the control is performed with poor ventilation efficiency in the vehicle interior.

On the other hand, in the first embodiment, as shown in steps 62, 63 and 64 in FIG. 6, the previous change in the gas concentration state in step 62 is in the dirt direction, and When it is determined that the GSC differential value DTGS is greater than or equal to the differential threshold value DGC, it is predicted that the nose of a person will be the most smell due to the occurrence of a single odor in the future. The gas sensor value GSC is set to GSC = 0 based on the prediction of shifting to the dirt direction, and the intake door 1 is fully closed according to the flow shown in FIG.

As described above, only when the previous gas concentration state change is in the stable direction as shown in FIG. 9A or in the clean direction as shown in FIG.
Since the door closing control is performed according to the size of TGS, it is not necessary to frequently enter the door closing control, and while ensuring good ventilation efficiency, high response can be achieved only when it is really necessary such as when a single odor is generated. The door closing control is performed.

[Combined control of outside air contamination prediction control and exhaust gas concentration correspondence control] When only the above-described outside air contamination prediction control is performed, a high response door closing control can be performed when a single odor is generated. Also, when the outside air is chronically at a high level and the gas concentration change is small, such as when driving in an urban area,
The intake door 1 is allowed to remain open to allow exhaust gas to enter the vehicle interior.

On the other hand, in the first embodiment, as shown in the flowchart of FIG. 3, in a gas state other than the state in which the intake door 1 is completely closed by the outside air contamination prediction control, FIG.
Corresponding to the control characteristic graph-1 shown in FIG. 7 and the calculation gas sensor value FGSC obtained in step 30, the outside air is in a clean state in which the degree of outside air is low, and the intake port is in the outside air mode, and the outside air is in a state of high outside air pollution. In the control, the door control corresponding to the exhaust gas concentration of the intake door 1 in which the suction port is set to the inside air mode is performed. Therefore, it is possible to achieve both the high-response door closing control at the time of occurrence of a single odor and the door opening / closing control at the same time to prevent exhaust gas intrusion and secure vehicle interior ventilation during traveling.

[Delay Control] When the target door opening degree shifts from fully closed to fully opened during traveling, the intake door 1 is fully opened immediately after the command is issued. Lacking time to remove,
The door operation will be performed frequently.

Therefore, in the flowchart of FIG. 3 showing the intake door control, step 36 → step 39
When the door is opened from REC to FRE, the delay time R is set, and the intake door 1 is opened after waiting for the delay time R even if a full open command is issued. Therefore, by the delay control, it is possible to secure time until the remaining exhaust gas odor disappears, and it is also possible to eliminate the trouble of frequently operating the door.

[Regarding Window Fogging Control] If exhaust gas corresponding intake door control is performed during running while the operation for removing window fogging is being performed, window fogging will not easily disappear. . Therefore, in the flowchart of FIG. 3 showing the intake door control, as apparent from step 34, when the differential mode is selected, which can be estimated as an operation for removing fogging of the window, the intake door control corresponding to the exhaust gas is not performed.
This makes it possible to incorporate the window fogging control into the exhaust gas corresponding intake door control.

In the automatic air-conditioning control, when the load is high (heat) as in the cool-down control, the control is shifted to the control (normal control) in which the automatic air-conditioning control is prioritized even if the air is clean (step) 33).

(Other Embodiments) In the first embodiment, an example is shown in which the gas sensor value GSC based on the clean air value GSMX is used as the gas concentration calculation value. The value obtained by the / D conversion may be used as the gas concentration calculation value. In the first embodiment,
Differentiating the gas sensor value GSC to predict outside air contamination,
Although an example in which the product quality is further improved has been described, the outside air contamination prediction need not be executed as the invention for performing the sensitivity adjustment described in claims 1 to 6. In the first embodiment, an example of the sensitivity adjusting means using a sensitivity adjusting switch and a threshold level display unit has been described. However, other adjusting means such as a dial switch and a number of button switches provided for each level may be used. May be used. In the first embodiment, an example is shown in which the outside air contamination prediction control means and the exhaust gas concentration corresponding door control means are used in combination. However, only the outside air contamination prediction control means may be applied. When the value condition is satisfied and the door is fully closed, the door is kept fully closed for the set timer time, and control is performed to open the door after the timer time has elapsed. When the door is fully closed, a subsequent change in the exhaust gas concentration may be monitored, and control may be performed to open the door when the exhaust gas concentration reaches a clean direction or a clean value. In the first embodiment, as the intake door control, as shown by the solid line characteristic in FIG. 7, the fully open and fully closed doors are turned on / off depending on whether the calculation gas sensor value indicating the exhaust gas concentration is equal to or greater than a threshold value. Although an example in which the control is performed in a controlled manner has been described, for example, as shown by a dotted line characteristic in FIG. 7, stepless control in which the target door opening is gradually changed according to the gas sensor value for calculation may be used. In the case of this stepless control, by setting the control characteristics based on the correlation characteristics of the odor intensity with respect to the intake door opening, it is possible to achieve both the suppression of the increase in the CO2 concentration in the passenger compartment and the suppression of the odor sensory value of the exhaust gas. .

[0043]

According to the first aspect of the present invention, in an intake door control device for controlling opening and closing of an intake door corresponding to an exhaust gas concentration outside a vehicle compartment, a sensitivity adjustment capable of arbitrarily correcting the exhaust gas concentration. Means, the switching control of the suction switching control means is configured to increase the tendency to switch to the outside air mode or to increase or change the tendency to switch to the inside air mode. The tendency to switch to outside air mode can be strengthened, and the tendency to switch to inside air mode can be strengthened so as to minimize the smell of exhaust gas. , It is possible to set a narrower correction region with respect to, and to improve the control quality by approaching the control originally required by the user with a simple configuration. Achieve the results. In addition, when the sensitivity is arbitrarily changed as described above, the calculated value of the exhaust gas concentration is corrected, so that it is necessary to change the control content in the suction switching control means, for example, the map and the control threshold value. Absent. Therefore, there is an effect that the control quality can be improved at a low cost.

According to the second and third aspects of the present invention, in the intake door control device according to the first aspect, the exhaust gas concentration calculating means is provided with a cleaning means based on a sensor value which is a sensor signal value. The exhaust gas concentration is calculated by dividing by the air value, and an initial value and a limit value are given to the clean air value, and the sensitivity adjusting means is used to correct the initial value of the clean air value when correcting the exhaust gas concentration. And the limit value are corrected, so that the sensor value is not directly converted to the gas concentration, but the clean air value is used as the reference value to correct the variation, temperature, and humidity characteristics of the sensor unit. As a result, the control accuracy is improved and the control quality can be improved, and the sensitivity adjusting means can be used for calculating the exhaust gas concentration. Can simply adjusting the gas value, it is easy to operation for correction, an effect that it is possible to provide a device of the present invention at low cost.

In the invention according to claim 4, claim 1 is
(3) In the intake door control device described in (3), since the memory means for holding the correction value by the sensitivity adjusting means while the voltage of the power supply of the vehicle is maintained is provided, once the user performs the correction by the sensitivity adjusting means, Unless the sensitivity is updated by the sensitivity adjuster or the voltage of the power supply is not reduced, the correction value is maintained in the memory, so that the operation by the sensitivity adjuster does not need to be performed frequently, and the operability can be improved. This has the effect. Claim 5
According to the invention described in the above aspect, in the intake door control device according to any one of claims 1 to 4, the sensitivity adjustment means includes a sensitivity adjustment switch that is manually operated and a display unit that displays a sensitivity level in conjunction with the switch operation. When the sensitivity adjusting means is operated, the sensitivity of the apparatus, that is, the change in the switching tendency of the inside / outside air mode can be adjusted by a simple switch operation while watching the display on the display unit, The effect that it is excellent in operability is produced. In the invention according to claim 6, in the intake door control device according to claim 5, the sensitivity adjustment switch is configured so that the correction value can be set in multiple steps or steplessly. Change of the switching tendency of
This has the effect of being excellent in operability that can be finely adjusted.

In the invention according to claims 7 and 8,
7. The intake door control device according to claim 1, further comprising a differential value calculating means for calculating a gas concentration differential value which is a change amount per unit time of the exhaust gas concentration obtained by the exhaust gas concentration calculating means, The suction switching control means determines whether the gas concentration state change is stable, clean direction, or dirty direction based on the gas concentration differential value, and controls based on the differential value, so that the gas concentration state is stable. Alternatively, it is possible to determine whether there is a tendency to clean or dirty, that is, it is possible to perform predictive control, and therefore, it is possible to improve the responsiveness. In particular, in the invention according to claim 8, the first determination means for determining whether the gas concentration state change is in a stable or clean direction or in a dirty direction based on the gas concentration differential value, Second determining means for determining whether the concentration differential value is equal to or greater than a preset differentiation threshold value, and the first determining means determining that the previous gas concentration state change is in a stable or clean direction, and When the second determination means determines that the current gas concentration differential value is equal to or greater than a preset differential threshold value, the air pollution control means for controlling the intake door in the inside air mode direction is provided. Thus, there is an effect that the door closing control can be performed with a high response only when it is really necessary, such as when a single odor is generated, while ensuring good ventilation efficiency without troublesome control of the door.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to a claim showing an intake door control device of the present invention.

FIG. 2 is an overall system diagram showing an intake door control device according to the first embodiment.

FIG. 3 is a flowchart illustrating a flow of an exhaust gas-responsive intake door control operation performed by an intake door control unit according to the first embodiment;

FIG. 4 is a flowchart illustrating a flow of sensitivity adjustment control performed by an intake door control unit according to the first embodiment;

FIG. 5 is a flowchart illustrating a flow of a gas sensor value process performed by an intake door control unit according to the first embodiment.

FIG. 6 is a flowchart illustrating a flow of a gas sensor value process (differential process) performed by an intake door control unit according to the first embodiment.

FIG. 7 is a characteristic diagram of a target door opening degree used in the exhaust gas concentration-dependent door control performed by the intake door control unit according to the first embodiment.

FIG. 8 is a diagram illustrating an example of a sensitivity adjustment switch for adjusting a correction value by the sensitivity adjustment control according to the first embodiment and an example of an adjustment level display unit.

FIG. 9 is a diagram showing a gas concentration differential value change pattern in which control for completely closing the intake door is executed in the outside air contamination prediction control according to the first embodiment.

[Explanation of symbols]

 a intake door b exhaust gas sensor c exhaust gas concentration calculating means d suction switching control means d1 differential value calculating means d2 first determining means d3 second determining means d4 outside air contamination prediction controlling means e sensitivity adjusting means f memory means g intake door actuator

Claims (8)

[Claims] 1. An intake door provided at a suction port of an air conditioner unit mounted on a vehicle and switched between an outside air mode and an inside air mode by an intake door actuator, an exhaust gas sensor installed in a vehicle and detecting an exhaust gas concentration of the outside air. An exhaust gas concentration calculating means for inputting a sensor signal from the exhaust gas sensor and calculating an exhaust gas concentration based on the sensor signal; and an inside air mode based on the exhaust gas concentration obtained by the exhaust gas concentration calculating means. An intake switching control means for controlling the driving of an intake door actuator to switch between an outside air mode and a suction switching control means, wherein a sensitivity adjusting means capable of arbitrarily correcting the exhaust gas concentration is provided; Increase the tendency of switching control to outside air mode or switch to inside air mode Intake door control device, characterized in that the changeable constructed or strengthened. 2. The exhaust gas concentration calculating means is configured to calculate an exhaust gas concentration by dividing a sensor value, which is a value of a sensor signal, by a reference clean air value. 2. The apparatus according to claim 1, wherein an initial value and a limit value are given, and wherein the sensitivity adjusting means is configured to correct the initial value and the limit value of the clean air value when correcting the exhaust gas concentration. Intake door control device. 3. The exhaust gas concentration calculating means sets a sensor value to an initial value when a predetermined time has not elapsed after starting the engine, and sets the sensor value to a clean air value when a predetermined time has elapsed after starting the engine. Only if it exceeds
After performing the process of updating the clean air value, it is configured to execute a calculation for obtaining the exhaust gas concentration, and the update process sets the clean air value to the sensor value within a range where the sensor value does not exceed the limit value. 3. The intake door control device according to claim 2, wherein the process of rewriting the clean air value to the limit value is performed in a range where the sensor value exceeds the limit value. 4. An intake door control device according to claim 1, further comprising a memory unit for holding the correction value by said sensitivity adjusting unit while the voltage of the power supply of the vehicle is maintained. . 5. The sensitivity adjusting means according to claim 1, further comprising a sensitivity adjusting switch manually operated, and a display unit for displaying a sensitivity level in response to the operation of the switch. An intake door control device as described in the above. 6. The intake door control device according to claim 5, wherein the sensitivity adjustment switch is configured so that a correction value can be set in multiple steps or in a stepless manner. 7. A differential value calculating means for calculating a gas concentration differential value, which is a change amount per unit time of the exhaust gas concentration obtained by said exhaust gas concentration calculating means, is provided. Based on the concentration differential value, it is determined whether the gas concentration state change is in the stable or clean direction or in the dirty direction. If the change is in the stable or clean direction, control is performed to maintain the current control. 7. The intake door control device according to claim 1, wherein the control is immediately performed to the inside air mode side when. 8. The intake door control device according to claim 7, wherein the suction switching control means determines whether the change in the gas concentration state is a stable or clean direction or a dirty direction based on the gas concentration differential value. First
Determining means; second determining means for determining whether the current gas concentration differential value is equal to or greater than a preset differential threshold value; and Outside air contamination prediction control means for controlling the intake door in the inside air mode when it is determined by the determination means, and when the second determination means determines that the current gas concentration differential value is equal to or greater than a preset differential threshold value. And an intake door control device.