JP3697814B2 - Inside / outside air switching device for vehicle - Google Patents

Description

現段階では、Ｔ_n+1 ＝Ｔ₁ 及びＴ_n ＝Ｔ₀ ＝０であるから累積時間Ｔ_S ＝Ｔ₁ とセットされる。従って、上限値Ｔ_max が累積時間Ｔ_S よりも大きい。このため、ステップ１８０における判定がＮＯとなる。
【００２８】
ついで、ステップ１８１において、車速センサ８０からのパルス信号の周波数に基づき車速Ｖ＝Ｖ_n+1 ＝Ｖ₂ が新たに算出される。
そして、ステップ１９０において、内気維持時間Ｔ＝Ｔ_n+1 ＝Ｔ₂ が車速Ｖ＝Ｖ_n+1 ＝Ｖ₂ に応じてＴ−Ｖ特性データＬに基づき設定される。
すると、ステップ２００において、差Ｔ_M がＴ_M ＝Ｔ_n+1 −Ｔ_n ＝Ｔ₂ −Ｔ₁ に基づき算出されるとともに、時間Ｔ_OLD がステップ１５０での最新の処理後の時間Ｔ_NOW に基づきＴ_OLD ＝Ｔ_NOW と更新される。
【００２９】
その後、ステップ２１０にて、今回の設定値Ｔ_n+1 ＝Ｔ₂ が先回の設定値Ｔ_n と更新される。
すると、ステップ１４０において、ステップ２００における差Ｔ_M 及び時間Ｔ_OLD に基づき、時間Ｔ_NOW ＝Ｔ_OLD ＋Ｔ_M が算出される。この場合、Ｔ−Ｖ特性データＬから分かるように、時間Ｔ_NOW は、車速Ｖの高低に応じて減増するように算出される。ついで、ステップ１５０における時間Ｔ_NOW の減算更新処理が上述と同様になされる。
【００３０】
以後、両ステップ１６０、１８０における判定が共にＮＯとなる間は、上記処理が繰り返される。
ここで、ステップ１８０における判定がＹＥＳになると、ステップ１８２にて差Ｔ_NOW ＝Ｔ_max とセットされ、ステップ１８３で時間Ｔ_NOW が減算される。
その後、ステップ１８４における判定がＹＥＳとなると、ステップ１６１にて内外気切換モードを外気導入モードに切り換える処理がなされる。
【００３１】
このため、サーボモータ２０ａが、マイクロコンピュータ９０の外気導入モードへの切換処理に応じて、内外気切換ドア２０を外気導入口１２を開くように切り換える。これにより、空調装置の内外気切換モードは外気導入モードとなる。このため、外気がエアダクト１０から空気流として車室内に吹き出す。
このとき、当該自動車は、排気ガスの分散領域から確実に脱出しているから、車室内に吹き出す外気は排気ガスによる汚れはなくきれいとなっている。
【００３２】
この場合、排気ガスによる汚れがなくなったことを一度判定しても、内気導入モードをそのまま維持し、内気維持時間Ｔの経過後、即ち、当該自動車が排気ガスの分散領域から確実に脱出した後に外気導入モードに切り換えるので、内外気切換ドア２０のハンチング動作を未然に防止しつつきれいな外気を車室内に導入できる。
【００３３】
しかも、外気導入モードへの切換時期が車速Ｖの高低に応じて適切に設定される。換言すれば、ステップ１４０において時間Ｔ_NOW が当該自動車の加速或いは減速に応じて短縮或いは延長される。
このため、車速Ｖの過渡的変化をも加味しつつ、当該自動車が排気ガスの分散領域から確実に脱出しその外気がきれいになる時期と内気導入モードを外気導入モードに切り換える時期が一致するように調整される。従って、車速Ｖの過渡的変化の有無とはかかわりなく、常に、乗員に対し快適感を与えつつきれいな外気をタイミングよく車室内に自動的に供給できる。
（第２実施形態）
図４は本発明の第２実施形態の要部を示している。
【００３４】
この第２実施形態では、図４にて示すフローチャートが、上記第１実施形態にて述べたフローチャート（図２及び図３参照）に代えて採用されている。
このため、マイクロコンピュータ９０は、上記コンピュータプログラムの実行を、図２及び図３のフローチャートに代えて、図４のフローチャートに従い行う。その他の構成は上記第１実施形態と同様である。
【００３５】
このように構成した本第２実施形態において、マイクロコンピュータ９０がコンピュータプログラムを図４のフローチャートに従い実行し始めれば、ステップ３００にて、ステップ１００における処理と同様に、ガスデータが入力されてディジタル変換されるとともに、ブロワモータ３０ａの駆動処理がなされる。
ついで、ステップ３１０において、ステップ１１０における処理と同様に、上記ガスデータの濃度Ｃが閾値Ｃｏと比較判定される。
【００３６】
ここで、ステップ３１０における判定がＹＥＳならば、ステップ３２０において、空調装置の内外気切換モードを内気導入モードに切り換える処理がなされる。
このため、内外気切換モードがサーボモータ２０ａによる内外気切換ドア２０に切換制御のもと上記第１実施形態と同様に内気導入モードに切り換えられる。
【００３７】
その後、ステップ３１０における判定がＮＯになると、ステップ３３０において内気導入モードを維持する処理がなされる。そして、ステップ３４０において、当該自動車の走行距離Ｄが、ステップ３１０でのＮＯとの判定後に車速センサ８０から出力されるパルス信号の周波数に基づき算出される車速Ｖに応じて算出される。
【００３８】
しかして、この走行距離Ｄが所定走行距離Ｄ_O 以下であれば、ステップ３５０における判定がＮＯとなり、以後、ステップ３３０乃至ステップ３５０を循環する処理が繰り返される。
ここで、所定走行距離Ｄ_O の意味について図５を参照して説明する。
図５において、符号Ｇ₁ は、当該自動車の進行方向に存在する先行車両や対向車両が排出する排気ガスの排気ガス領域の位置を示し、また、符号Ｇ₂ は、当該自動車の進行方向における上記先行車両や対向車両よりもさらに先の先行車両や対向車両が排出する排気ガスの排気ガス領域の位置を示すものとする。
【００３９】
また、符号Ｐは、外気の排気ガスによる汚れがないと一度判定した後、内気導入モードの維持時間を一定にした場合、内気導入モードと外気導入モードとの間の切り換えが当該自動車の車速Ｖの高低に応じてどのようになされるかを例示する。
これによれば、当該自動車が排気ガス領域Ｇ₁ に入った後点ａにて外気の排気ガスに汚れがないと判定した後の当該自動車の走行距離は、車速Ｖが高い程長いことが分かる（図５にて各符号Ａ、Ｂ、Ｃによる矢印参照）。なお、点ａは、排気ガス領域Ｇ₁ 内において排気ガスの存在しない位置を示す。
【００４０】
従って、排気ガス領域Ｇ₁ に入ることで内気導入モードになった後この内気導入モードが当該自動車が点ａの位置に達した後も維持される走行距離は、車速Ｖが高い程長い。換言すれば、当該自動車が両排気ガス領域Ｇ₁ 、Ｇ₂ の間の走行中に外気導入モードに維持される走行距離は、車速Ｖが高い程短い（図５にて各符号Ａ１、Ｂ１、Ｃ１による矢印参照）。
【００４１】
このため、車速Ｖが高い程、外気導入モードに切り換わった後内気導入モードに切り換わる時期が早くなってしまい、きれいな外気の車室内への導入継続時間が短くなる。
一方、符号Ｑは、外気の排気ガスによる汚れがないと判定した後、内気導入モードに維持する時間を当該自動車の所定走行距離に対応させた場合に、内気導入モードと外気導入モードとの間の切り換えが当該自動車の車速Ｖの高低に応じてどのようになされるかを例示する。
【００４２】
これによれば、当該自動車が排気ガス領域Ｇ₁ に入った後点ａにて外気の排気ガスに汚れがないと判定した後の内気導入モードの維持時間は、車速Ｖの高低に関係なく、当該自動車の所定走行距離の走行終了によって制限される。
従って、排気ガス領域Ｇ₁ に入ることで内気導入モードになった後この内気導入モードが当該自動車が点ａの位置に達した後も維持される時間は、車速Ｖの高低に関係なく一定となる（図５にて各符号Ａ２、Ｂ２、Ｃ２により示す矢印参照）。
【００４３】
換言すれば、当該自動車が両排気ガス領域Ｇ₁ 、Ｇ₂ の間の走行中に外気導入モードに維持される時間、即ち、外気導入モードでのきれいな外気の車室内への導入継続時間が、当該自動車の車速Ｖの高低に関係なく一定となる（図５にて各符号Ａ３、Ｂ３、Ｃ３により示す矢印参照）。
そこで、本第２実施形態では、上記第１実施形態にて述べた内気維持時間Ｔの車速Ｖに応じた調整に代えて、この内気維持時間Ｔに相当する内気導入モードの維持時間の制限条件として所定走行距離Ｄ_O を採用した。
【００４４】
然る後、ステップ３５０における判定がＹＥＳになると、ステップ３６０にて外気導入モードへの切換処理がなされる。これにより、内外気切換モードが外気導入モードになる。
以上のように、外気の排気ガスによる汚れがないと一度判定した後の内気導入モードの維持時間が上記所定走行距離Ｄ_O でもって規制されるので、その後の外気導入モードの維持時間が、車速Ｖの高低にかかわらず、当該自動車の同一の走行距離の間継続され得る。
【００４５】
これにより、車速Ｖの高低にかかわらず、外気導入モードへの切り換えを有効に利用しつつ、車室内へのきれいな外気の十分な導入を確保できる。
なお、上記各実施形態のフローチャートにおける各ステップは、それぞれ、機能実行手段としてハードロジック構成により実現するようにしてもよい。
また、本発明にあたり、車両の排気ガスに限らず、外気を汚すガスが分散して存在する場合にも、本発明と適用して実施してもよい。
【図面の簡単な説明】
【図１】本発明の第１実施形態を示すブロック図である。
【図２】図１のマイクロコンピュータの作用を示すフローチャートの前段部である。
【図３】当該フローチャートの後段部である。
【図４】本発明の第２実施形態の要部を示すフローチャートである。
【図５】上記第２実施形態にて、内気導入モードから外気導入モードへの切り換えが、外気の汚れなしとの判定後一定時間の経過時に行われる場合と、外気の汚れなしとの判定後一定走行距離の走行終了時に行なわれる場合とで、内気導入モード維持時間や外気導入モード継続時間がどのようになるかを説明するための模式図である。
【符号の説明】
１０…エアダクト、２０…内外気切換ドア、７０…排気ガスセンサ、
８０…車速センサ、９０…マイクロコンピュータ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle inside / outside air switching device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in an air conditioner for an automobile, the air conditioner is switched from an outside air introduction mode to an inside air introduction mode in order to prevent the exhaust gas of a preceding vehicle or an oncoming vehicle from entering the vehicle through the air duct.
[0003]
[Problems to be solved by the invention]
By the way, the exhaust gas is usually dispersed over a certain region. For this reason, the alternate switching between the inside air introduction mode and the outside air introduction mode is frequently repeated depending on the region where the exhaust gas exists and the region where the exhaust gas does not exist. Therefore, there is a problem that the hunting operation of the inside / outside air switching door is caused.
[0004]
Therefore, even if it is once detected that the outside air is not contaminated by the exhaust gas, it is desirable to immediately maintain the inside air introduction mode temporarily without switching to the outside air introduction mode.
For this, it is conceivable to switch to the outside air introduction mode after the exhaust gas is detected once and held in the inside air introduction mode for a certain time.
[0005]
However, the time when the automobile can surely escape from the above-mentioned exhaust gas dispersion region varies depending on the vehicle speed of the automobile.
For example, when the vehicle speed of an automobile is high, there is a case where the outside air exhaust gas is no longer contaminated but is maintained clean, but the inside air introduction mode is maintained, which causes a sense of incongruity. On the other hand, if the vehicle speed of the automobile is low, the outside air is still contaminated by the exhaust gas, but the problem of switching to the outside air introduction mode is caused.
[0006]
In addition, although there is something as shown in Japanese Patent Laid-Open No. 4-45372, the maintenance time of the inside air introduction mode switched with the detection of the exhaust gas is simply set manually by the inside air set switch. Only.
Therefore, in order to cope with the above, the present invention switches between the outside air introduction mode and the outside air introduction mode frequently by switching to the outside air introduction mode when the vehicle is surely removed from the outside air dirt region. It is an object of the present invention to provide a vehicular inside / outside air switching device that always introduces clean outside air into a vehicle compartment while preventing switching.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first and second aspects of the invention, when the determination means determines that the air outside the passenger compartment is not clean, the air introduction mode is switched to the inside air introduction mode, and then the determination means When it is determined to be clean, the inside air introduction mode is maintained, the maintenance time is shortened as the detected vehicle speed increases, and the air introduction mode control means is controlled so as to switch to the outside air introduction mode when the above time elapses.
[0008]
As a result, the vehicle is switched to the outside air introduction mode after reliably exiting from the gas dispersion region that pollutes outside air such as exhaust gas. Therefore, it is possible to introduce clean outside air into the vehicle interior while preventing frequent switching between the inside air introduction mode and the outside air introduction mode.
According to the second aspect of the present invention, the air introduction mode control means decreases the time for maintaining the inside air introduction mode according to the acceleration / deceleration of the vehicle, and the outside air introduction mode in consideration of the increase / decrease result. Control when to switch to.
[0009]
Therefore, while taking into account the transitional changes in the vehicle speed, the time when the vehicle surely escapes from the dispersed region of exhaust gas etc. and the outside air becomes clean is matched with the time when the inside air introduction mode is switched to the outside air introduction mode. Is done. Accordingly, it is possible to automatically supply clean outside air to the passenger compartment at a good timing while always giving a comfortable feeling to the occupant regardless of whether or not the vehicle speed changes transiently.
[0010]
According to the invention described in claim 3, when the determination means determines that the air outside the passenger compartment is not clean, the air introduction mode is switched to the inside air introduction mode, and then the inside air introduction mode is determined when the determination means determines that the air is clean. This is controlled by the air introduction mode control means so that the maintenance time is limited by the detected travel distance, and the mode is switched to the outside air introduction mode when the detected travel distance reaches the predetermined travel distance.
[0011]
Thus, since the maintenance time to the inside air introduction mode is limited by the predetermined travel distance, the duration time of the outside air introduction mode is the same regardless of the vehicle speed. As a result, it is possible to ensure sufficient introduction of clean outside air into the vehicle interior while effectively using the switching to the outside air introduction mode.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1 to 3 show an example in which the present invention is applied to an automotive air conditioner.
The air conditioner includes an air duct 10 mounted on the automobile, and the air duct 10 has an inside / outside air switching door 20, a blower 30, an evaporator 40, an air mix door 50, and a heater core from the upstream side to the downstream side. 60 are sequentially arranged.
[0013]
The inside / outside air switching door 20 is supported in the upstream portion of the air duct 10 so as to be switchable at a boundary portion between the inside air introduction port 11 and the outside air introduction port 12.
Thus, when the inside / outside air switching door 20 opens the inside air introduction port 11, the air in the passenger compartment of the automobile is introduced as inside air into the upstream portion of the air duct 10 according to the action of the blower 30. On the other hand, when the inside / outside air switching door 20 opens the outside air introduction port 12, the air outside the vehicle compartment is introduced as outside air into the upstream portion of the air duct 10 according to the action of the blower 30. The inside / outside air switching door 20 is switched by a servo motor 20a.
[0014]
The blower 30 is disposed downstream of the inside / outside air switching door 20 in the upstream portion of the air duct 10, and the blower 30 converts the introduced inside air or the introduced outside air into the air flow according to the rotation of the blower motor 30a. Then, the air is blown out from the outlet of the air duct 10 through the evaporator 40, the air mix door 50, and the heater core 60 into the vehicle interior. The blower motor 30a is driven by a drive circuit 30b.
[0015]
Next, an electric circuit configuration for the servo motor 20a and the drive circuit 30b will be described.
The exhaust gas sensor 70 is disposed at an appropriate position of a radiator disposed in the engine room of the automobile. The exhaust gas sensor 70 passes through the front grill of the automobile and exhaust gas in the outside air flowing into the engine room. Detect concentration.
[0016]
The vehicle speed sensor 80 detects the vehicle speed of the vehicle and generates a pulse signal at a frequency proportional to the vehicle speed.
The microcomputer 90 executes a computer program according to the flowcharts shown in FIGS. 2 and 3, and during this execution, processing required for switching control of the inside / outside air switching door 20 based on the outputs of the exhaust gas sensor 70 and the vehicle speed sensor 80. I do.
[0017]
The computer program is stored in advance in the ROM of the microcomputer 90. Further, the microcomputer 90 operates by being supplied with power from the battery B mounted on the automobile through the ignition switch IG.
In the first embodiment configured as described above, the automobile starts to run under the operation of the engine accompanying the ON operation of the ignition switch IG, and the microcomputer 90 executes the computer program according to the flowcharts of FIGS. It shall begin to execute.
[0018]
Then, at step 100, the detection output of the exhaust gas sensor 70 is input to the microcomputer 90 as gas data and is digitally converted. Hereinafter, this digital conversion value is referred to as gas data.
In step 100, the blower motor 30a is driven. For this reason, the blower motor 30a is driven by the drive circuit 30b, and the blower 30 blows out the air introduced into the air duct 10 into the vehicle interior.
[0019]
Next, if the exhaust gas concentration of the gas data (hereinafter referred to as exhaust gas concentration C) is higher than a predetermined threshold value Co, the outside air in the traveling region of the automobile is contaminated by the exhaust gas of the preceding vehicle or the oncoming vehicle of the automobile. ing. For this reason, after the determination in step 110 is YES, in step 111, a process for changing the inside / outside air switching mode of the air conditioner to the inside air introduction mode is performed. The threshold value Co corresponds to an allowable lower limit value of the degree of contamination due to the exhaust gas of the outside air.
[0020]
Therefore, the servo motor 20a switches the inside / outside air switching door 20 to open the inside air introduction port 11 in accordance with the switching process of the microcomputer 90 to the inside air introduction mode. As a result, the inside / outside air switching mode of the air conditioner becomes the inside air introduction mode, and the air in the passenger compartment is blown out from the air duct 10 into the passenger compartment as an air flow.
Thereafter, when the determination in step 110 is NO, the vehicle speed of the vehicle (hereinafter referred to as vehicle speed V) is determined as a pulse signal from the vehicle speed sensor 80 in the next step 112 while maintaining the inside / outside air switching mode in the inside air introduction mode. Calculated based on frequency.
[0021]
As described above, even if NO is determined in step 110 once, the inside / outside air switching mode is not immediately switched to the outside air introduction mode because the automobile is in the exhaust gas dispersion region of the preceding vehicle or the oncoming vehicle. This is because it may be temporarily determined that the exhaust gas is no longer contaminated.
When the vehicle speed V is calculated as described above, in the next step 120, the time T during which the inside / outside air switching mode should be maintained in the inside air introduction mode after determining that there is no dirt in step 110 (hereinafter referred to as the inside air maintenance time T). ) And the vehicle speed V, the inside air maintenance time T is calculated based on the TV characteristic data L representing the relationship between the vehicle speed V and the vehicle speed V. Therefore, if the vehicle speed V = V ₁ , the inside air maintenance time T = T ₁ is set (see FIG. 2).
[0022]
Here, the reason why the TV characteristic data L is determined as shown in FIG. 2 will be described.
When the exhaust gas is dispersed in the traveling area of the automobile, the inside / outside air switching mode is maintained in the inside air introduction mode so that dirty outside air is not introduced into the passenger compartment until the automobile is removed from the dispersion area. There is a need.
[0023]
Here, the time required for the vehicle to leave the exhaust gas dispersion region becomes shorter as the vehicle speed V increases. Therefore, if the inside air maintenance time T and the vehicle speed V are in a substantially inversely proportional relationship with each other, the inside / outside air switching mode is switched to the outside air introduction mode in a timely manner when the vehicle leaves the exhaust gas dispersion region. Setting according to the vehicle speed V of the inside air maintenance time T is possible.
[0024]
For this reason, the TV characteristic data L is set in a linear inverse proportional relationship as shown in step 120 of FIG. In the TV characteristic data L, T _max and T _min are an upper limit value and a lower limit value of the time T.
After the processing in step 120, in step 130, the time T _OLD at the previous processing of the inside air maintenance time T is set as T _OLD = 0. Further, the current set value T _{n + 1} of the inside air maintenance time T in step 120 is set to T _{n + 1} = T _1, and the inside air maintenance time T and the previous set value T _n are set to T _n = T _0. = 0 is set. Then, the difference (T _{n + 1} −T _n ) between the set values T _{n + 1} and T _n is set as the difference T _M = T ₁ −T ₀ = T ₁ .
[0025]
Next, in step 140, the sum of the time T _OLD and the difference T _M in step 130 is calculated as the current time T _NOW (= T _OLD + T _M ). Here, the current time T _NOW decreases in accordance with the vehicle speed V.
When the current time T _NOW is calculated in this way, in step 150, the time T _NOW is subtracted and updated as time T _NOW = T _NOW -1.
[0026]
At the present stage, since the time T _NOW is greater than zero, the processing after Step 170 is performed. This is because the acceleration / deceleration state of the automobile traveling in the exhaust gas dispersion region is also taken into consideration in the time T _NOW .
In step 170, the accumulated time T _S is calculated based on the following equation (1).
[0027]
[Expression 1]

At the present stage, since T _{n + 1} = T ₁ and T _n = T ₀ = 0, the accumulated time T _S = T ₁ is set. Therefore, the upper limit value T _max is larger than the cumulative time T _S. For this reason, the determination in step 180 is NO.
[0028]
Next, at step 181, the vehicle speed V = V _{n + 1} = V ₂ is newly calculated based on the frequency of the pulse signal from the vehicle speed sensor 80.
In step 190, the inside air maintenance time T = T _{n + 1} = T ₂ is set based on the TV characteristic data L in accordance with the vehicle speed V = V _{n + 1} = V ₂ .
Then, in step 200, the difference T _M is calculated based on T _M = T _{n + 1} −T _n = T ₂ −T ₁ , and the time T _OLD is the time T _NOW after the latest processing in step 150. Based on T _OLD = T _NOW .
[0029]
Thereafter, in step 210, the current set value T _{n + 1} = T ₂ is updated with the previous set value T _n .
Then, in step 140, time T _NOW = T _OLD + T _M is calculated based on the difference T _M and time T _OLD in step 200. In this case, as can be seen from the TV characteristic data L, the time T _NOW is calculated so as to decrease according to the level of the vehicle speed V. Next, the subtraction update process for the time T _NOW in step 150 is performed in the same manner as described above.
[0030]
Thereafter, as long as the determinations in both steps 160 and 180 are NO, the above process is repeated.
If the determination in step 180 is YES, the difference T _NOW = T _max is set in step 182 and the time T _NOW is subtracted in step 183.
Thereafter, when the determination in step 184 is YES, in step 161, processing for switching the inside / outside air switching mode to the outside air introduction mode is performed.
[0031]
Therefore, the servo motor 20a switches the inside / outside air switching door 20 to open the outside air introduction port 12 in accordance with the switching process of the microcomputer 90 to the outside air introduction mode. Thereby, the inside / outside air switching mode of the air conditioner becomes the outside air introduction mode. For this reason, outside air blows out from the air duct 10 as an air flow into the vehicle interior.
At this time, since the automobile surely escapes from the exhaust gas dispersion region, the outside air blown into the vehicle interior is clean without being contaminated by the exhaust gas.
[0032]
In this case, even if it is determined that the exhaust gas is no longer contaminated, the inside air introduction mode is maintained as it is, and after the inside air maintenance time T has elapsed, that is, after the automobile has surely escaped from the exhaust gas dispersion region. Since the mode is switched to the outside air introduction mode, clean outside air can be introduced into the vehicle compartment while preventing the hunting operation of the inside / outside air switching door 20 in advance.
[0033]
Moreover, the timing for switching to the outside air introduction mode is appropriately set according to the level of the vehicle speed V. In other words, in step 140, the time T _NOW is shortened or extended according to the acceleration or deceleration of the vehicle.
For this reason, while taking into account the transitional change in the vehicle speed V, the time when the vehicle surely escapes from the exhaust gas dispersion region and the outside air is clean is coincident with the time when the inside air introduction mode is switched to the outside air introduction mode. Adjusted. Accordingly, it is possible to automatically supply clean outside air to the passenger compartment with good timing at all times, regardless of whether or not the vehicle speed V changes transiently.
(Second Embodiment)
FIG. 4 shows a main part of the second embodiment of the present invention.
[0034]
In the second embodiment, the flowchart shown in FIG. 4 is employed in place of the flowchart (see FIGS. 2 and 3) described in the first embodiment.
Therefore, the microcomputer 90 executes the computer program according to the flowchart of FIG. 4 instead of the flowcharts of FIGS. Other configurations are the same as those in the first embodiment.
[0035]
In the second embodiment configured as described above, if the microcomputer 90 starts to execute the computer program according to the flowchart of FIG. 4, in step 300, gas data is input and digitally converted in the same manner as in step 100. At the same time, the drive process of the blower motor 30a is performed.
Next, in step 310, as in the processing in step 110, the concentration C of the gas data is compared with the threshold value Co.
[0036]
Here, if the determination in step 310 is YES, in step 320, a process of switching the inside / outside air switching mode of the air conditioner to the inside air introduction mode is performed.
For this reason, the inside / outside air switching mode is switched to the inside air introduction mode under the switching control of the inside / outside air switching door 20 by the servo motor 20a as in the first embodiment.
[0037]
Thereafter, when the determination in step 310 is NO, a process of maintaining the inside air introduction mode is performed in step 330. In step 340, the travel distance D of the vehicle is calculated according to the vehicle speed V calculated based on the frequency of the pulse signal output from the vehicle speed sensor 80 after the determination of NO in step 310.
[0038]
Therefore, if the travel distance D is equal to or less than the predetermined travel distance D _O , the determination in step 350 is NO, and thereafter, the process of circulating from step 330 to step 350 is repeated.
Here, the meaning of the predetermined travel distance D _O will be described with reference to FIG.
In FIG. 5, the symbol G ₁ indicates the position of the exhaust gas region of the exhaust gas exhausted by the preceding vehicle and the oncoming vehicle existing in the traveling direction of the vehicle, and the symbol G ₂ indicates the above-mentioned in the traveling direction of the vehicle It is assumed that the position of the exhaust gas region of the exhaust gas discharged by the preceding vehicle and the oncoming vehicle further ahead of the preceding vehicle and the oncoming vehicle is indicated.
[0039]
Further, the symbol P indicates that the vehicle speed V of the vehicle is changed between the inside air introduction mode and the outside air introduction mode when the maintenance time of the inside air introduction mode is made constant after it is determined that the outside air is not contaminated by the exhaust gas. An example of how this is done according to the height of the.
According to this, it can be seen that the mileage of the vehicle after it is determined that the exhaust gas of the outside air is not dirty at the point a after the vehicle enters the exhaust gas region G ₁ is longer as the vehicle speed V is higher. (Refer to the arrows by the symbols A, B, and C in FIG. 5). Incidentally, the point a represents a nonexistent location in the exhaust gas in the exhaust gas in the region G _1.
[0040]
Therefore, the travel distance that is maintained after the vehicle reaches the position of point a after entering the inside air introduction mode by entering the exhaust gas region G ₁ is longer as the vehicle speed V is higher. In other words, the traveling distance that the vehicle is maintained in the outside air introduction mode while traveling between the exhaust gas regions G ₁ and G ₂ is shorter as the vehicle speed V is higher (in FIG. 5, each symbol A1, B1, (See arrow by C1).
[0041]
For this reason, the higher the vehicle speed V, the earlier the time for switching to the inside air introduction mode after switching to the outside air introduction mode, and the shorter the duration of introduction of clean outside air into the vehicle interior.
On the other hand, when it is determined that the outside air is not contaminated by the exhaust gas and the time for maintaining the inside air introduction mode is made to correspond to the predetermined travel distance of the vehicle, the symbol Q is between the inside air introduction mode and the outside air introduction mode. An example of how the switching is performed according to the vehicle speed V of the vehicle.
[0042]
According to this, the maintenance time of the inside air introduction mode after determining that the exhaust gas of the outside air is not contaminated at the point a after the vehicle enters the exhaust gas region G ₁ is independent of the level of the vehicle speed V. It is limited by the end of travel of the vehicle for a predetermined travel distance.
Therefore, after entering the exhaust gas region G ₁ to enter the inside air introduction mode, the time that the inside air introduction mode is maintained after the vehicle reaches the position of point a is constant regardless of the level of the vehicle speed V. (Refer to the arrows indicated by the symbols A2, B2, and C2 in FIG. 5).
[0043]
In other words, the time during which the vehicle is maintained in the outside air introduction mode while traveling between the two exhaust gas regions G ₁ and G ₂ , that is, the duration of introduction of clean outside air into the vehicle interior in the outside air introduction mode, It is constant regardless of the vehicle speed V of the vehicle (see arrows indicated by reference signs A3, B3, and C3 in FIG. 5).
Therefore, in the second embodiment, instead of the adjustment according to the vehicle speed V of the inside air maintenance time T described in the first embodiment, the restriction condition for the maintenance time of the inside air introduction mode corresponding to this inside air maintenance time T A predetermined travel distance D _O was adopted.
[0044]
Thereafter, when the determination in step 350 is YES, a process for switching to the outside air introduction mode is performed in step 360. As a result, the inside / outside air switching mode becomes the outside air introduction mode.
As described above, the maintenance time of the inside air introduction mode after it is once determined that there is no contamination by the exhaust gas of the outside air is regulated by the predetermined travel distance D _O. Regardless of the level of V, it can continue for the same mileage of the vehicle.
[0045]
Thereby, irrespective of the level of the vehicle speed V, it is possible to ensure sufficient introduction of clean outside air into the vehicle interior while effectively using the switching to the outside air introduction mode.
Note that each step in the flowcharts of the above embodiments may be realized by a hardware logic configuration as a function execution unit.
Further, in the present invention, the present invention may be applied to the present invention not only in the exhaust gas of a vehicle but also in the case where a gas that pollutes the outside air exists in a dispersed manner.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of the present invention.
2 is a front part of a flowchart showing the operation of the microcomputer of FIG. 1;
FIG. 3 is a latter part of the flowchart.
FIG. 4 is a flowchart showing a main part of a second embodiment of the present invention.
FIG. 5 shows a case where switching from the inside air introduction mode to the outside air introduction mode is performed when a certain period of time has elapsed after the determination that the outside air is not contaminated, and after the determination that the outside air is not contaminated in the second embodiment. It is a schematic diagram for demonstrating how inside air introduction mode maintenance time and outside air introduction mode continuation time will be when it is performed at the time of completion | finish of driving | running | working of a fixed travel distance.
[Explanation of symbols]
10 ... Air duct, 20 ... Inside / outside air switching door, 70 ... Exhaust gas sensor,
80 ... Vehicle speed sensor, 90 ... Microcomputer.

Claims (3)

In the inside / outside air switching device that switches the air introduction mode into the vehicle interior between the outside air introduction mode and the inside air introduction mode,
A dirt sensor (70) for detecting dirt in the air outside the passenger compartment;
A vehicle speed sensor (80) for detecting the vehicle speed of the vehicle;
Determination means (110) for determining whether or not the air outside the passenger compartment is clean based on the detection output of the dirt sensor;
When it is determined that the determination means is not clean, the air introduction mode is switched to the inside air introduction mode. After that, when the determination means determines that the inside air introduction mode is maintained, the inside air introduction mode is maintained. Air introduction mode control means (112, 120 to 150, 180 to 210) for controlling to switch to the outside air introduction mode when the time elapses is provided. Switching device. The air introduction mode control means decreases the time for maintaining the inside air introduction mode according to the acceleration / deceleration of the vehicle, and controls the switching time to the outside air introduction mode in consideration of the increase / decrease result. The vehicle inside / outside air switching device according to claim 1. In the inside / outside air switching device that switches the air introduction mode into the vehicle interior between the outside air introduction mode and the inside air introduction mode,
A dirt sensor (70) for detecting dirt in the air outside the passenger compartment;
A distance sensor (80, 340) for detecting the travel distance of the vehicle;
Determination means (310) for determining whether or not the air outside the passenger compartment is clean based on the detection output of the dirt sensor;
When it is determined that the determination means is not clean, the air introduction mode is switched to the inside air introduction mode. After that, when the determination means determines that the condition is clean, the inside air introduction mode is maintained, and the maintenance time is set as the detected travel distance. And an air introduction mode control means (330 to 360) for controlling to switch to the outside air introduction mode at the end of the travel of the predetermined distance. Vehicle inside / outside air switching device.

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