# JP4086763B2 - Tire pressure drop detecting method and apparatus, as well as a tire program for judging decompression of - Google Patents

Tire pressure drop detecting method and apparatus, as well as a tire program for judging decompression of Download PDF

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JP4086763B2
JP4086763B2 JP2003393594A JP2003393594A JP4086763B2 JP 4086763 B2 JP4086763 B2 JP 4086763B2 JP 2003393594 A JP2003393594 A JP 2003393594A JP 2003393594 A JP2003393594 A JP 2003393594A JP 4086763 B2 JP4086763 B2 JP 4086763B2
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## Description

ＤＥＬ＝｛（Ｖ１＋Ｖ４）／２−（Ｖ２＋Ｖ３）／２｝／ DEL = {(V1 + V4) / 2- (V2 + V3) / 2} /
｛（Ｖ１＋Ｖ２＋Ｖ３＋Ｖ４）／４｝×１００（％） {(V1 + V2 + V3 + V4) / 4} × 100 (%)
を用いている（たとえば特許文献１参照）。 Are used (e.g., see Patent Document 1). ここで、Ｖ１〜Ｖ４は、それぞれ前左タイヤ、前右タイヤ、後左タイヤおよび後右タイヤの車輪速度である。 Here, V1-V4, the front left tire, respectively, a front right tire, a wheel speed of the rear left tire and a rear right tire.

しかしながら、前記方法では、一対の対角線上の車輪速度の相対比較をしているため、左側全車輪または右側全車輪（同サイドの２輪タイヤ）の同時減圧や、前輪２輪タイヤの同時減圧または後輪２輪タイヤの同時減圧、さらにすべての車輪タイヤの空気が同じように低下した場合の減圧を判定することができない。 However, in the above method, since the relative comparison of wheel speeds on a pair of diagonals, simultaneous deflation and the left all the wheels or the right all the wheels (2 wheel tires of the same side), simultaneous deflation or two front wheel tires simultaneous deflation of two rear wheels tires, further air all wheel tires can not determine the decompression when dropped in the same way. このため、減圧していると分からずに、走行を続けることにより、タイヤの転がり抵抗の増加による燃費の悪化、ひいてはバーストにつながるという問題がある。 Therefore, without knowing when being reduced pressure, by continuing the running, deterioration in fuel economy due to an increase in rolling resistance of the tire, there is a problem that eventually leads to bursts.

また、本発明のタイヤ空気圧低下検出装置は、車両に装着したタイヤから得られる車輪回転情報に基づいてタイヤ空気圧の低下を検出するタイヤ空気圧低下検出装置であって、前記各タイヤの車輪回転情報を検出する車輪速度検出手段と、車体速度を求める車体速度演算手段と、該車輪回転情報から、右サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および左サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出または、前輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および後輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出する速度情報演算手段と、各タイヤの車輪回転情報と前記車輪位置の車輪の速度情報を記憶する Also, the tire pressure drop detecting device of the present invention is a tire air pressure reduction detection DeSo location for detecting a decrease in tire air pressure based on wheel rotation information obtained from tires attached to a vehicle, a wheel rotation of the respective tires a wheel speed detecting means for detecting information, and vehicle speed calculating means for obtaining a vehicle body speed from the wheel rotational information, the wheel comprising a wheel rotational information of the wheel position relative to the wheel of the two wheels on the right side speed information and the left calculating wheel speed information consisting of wheel rotational information of the wheel position relative to the wheel of the two wheels, or wheel position relative to the wheel of the wheel speed information and the two rear wheels consisting of a wheel rotational information of the wheel position relative to the wheel of the two front wheels stores the velocity information calculation means for calculating the wheel speed information of consisting of wheel rotation information, the wheel speed information of the wheel position and wheel rotation information regarding the respective tires of 憶手段と、前記車輪位置の車輪の速度情報と車体速度とを比較して、前記車輪位置の判定値を算出する判定値演算手段と、予め規定内圧時における前記車輪位置の車輪の速度情報と車体速度を比較して得られる前記車輪位置の基準値と前記車輪位置の前記判定値を比較する比較手段と、当該基準値と判定値の比較値と所定のしきい値との関係に基づいて、タイヤの空気圧低下を判定する減圧判定手段とを備えてなることを特徴としている。 And 憶 means, by comparing the wheel speed information and the vehicle speed of the wheel position, the determination value calculation means for calculating a judgment value of said wheel position, and the wheel speed information of the wheel position at a predefined pressure comparing means for comparing the judgment value of the reference value and the wheel position of the wheel position obtained by comparing the vehicle speed, based on the relationship between the comparison value with a predetermined threshold value of the reference value and the determination value It is characterized by comprising a decompression judging means for judging decrease in tire air-pressure.

さらに、本発明のタイヤ減圧判定のプログラムは、車両に装着したタイヤから得られる車輪回転情報に基づいてタイヤ空気圧の低下を判定するためにコンピュータを、該車輪回転情報から、右サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および左サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出または、前輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および後輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出する速度情報演算手段、各タイヤの車輪回転情報と前記車輪位置の車輪の速度情報を記憶する記憶手段、前記車輪位置の車輪の速度情報と求められた車体速度とを比較して、前記車輪位置の判定値を算出する Further, the program of judging tire deflation of the present invention, a computer to determine a decrease in tire air pressure based on wheel rotation information obtained from tires attached to a vehicle, the wheel rotation information, the two-wheel on the right side calculating wheel speed information consisting of wheel rotational information of the wheel position relative to the wheel of the two wheels of the wheel speed information and the left side consisting of wheel rotational information of the wheel position relative to the wheel or wheel of the wheel position relative to the wheel of the two front wheels velocity information calculation means for calculating the wheel speed information of consisting of wheel rotational information of the wheel position relative to the wheel speed information of the wheels comprising a rotation information and the two rear wheels, the wheels of the wheel position and wheel rotation information of the respective tires storage means for storing speed information is compared with the vehicle speed obtained with the wheel speed information of the wheel position, and calculates a determination value of the wheel position 定値演算手段、予め規定内圧時における前記車輪位置の車輪の速度情報と車体速度を比較して得られる前記車輪位置の基準値と前記車輪位置の前記判定値を比較する比較手段、当該基準値と判定値の比較値と所定のしきい値との関係に基づいて、タイヤの空気圧低下を判定する減圧判定手段として機能させることを特徴としている。 Value calculating means, comparing means for comparing the judgment value of the reference value and the wheel position of the wheel speed information and the wheel position obtained by comparing the vehicle speed of the wheel position at a predefined pressure, and the reference value based on the relationship between the comparison value and a predetermined threshold determination value, is characterized in that to function as decompression judging means for judging decrease in tire air-pressure.

ところで、タイヤは規格内でのばらつき（初期差異）が含まれて製造されるため、各タイヤの有効転がり半径（一回転により進んだ距離を２πで割った値）は、すべてのタイヤがたとえ正常空気圧であっても、同一とは限らない。 Incidentally, since the tires are manufactured to include variations within a standard (initial difference), effective rolling radii of respective tires (value obtained distance traveled by a single rotation divided by 2 [pi), all tires even normal even in the air pressure, not necessarily the same. そのため、各タイヤの回転角速度Ｆｉはばらつくことになる。 Therefore, the rotational angular velocities Fi of respective tires thus vary. そこで、たとえば回転角速度Ｆｉから初期差異の影響を排除する方法がある。 Therefore, there is a method of eliminating the influence of initial difference, for example, from the rotational angular velocities Fi. この方法では、まず、つぎに示される初期補正係数Ｋ１、Ｋ２、Ｋ３を算出する。 In this method, first, it calculates an initial correction coefficient K1, K2, K3 shown below.
Ｋ１＝Ｆ１／Ｆ２ ・・・（１） K1 = F1 / F2 ··· (1)
Ｋ２＝Ｆ３／Ｆ４ ・・・（２） K2 = F3 / F4 ··· (2)
Ｋ３＝（Ｆ１＋Ｋ１×Ｆ２）／（Ｆ ＋Ｋ２×Ｆ４） ・・・（３） K3 = (F1 + K1 × F2 ) / (F 3 + K2 × F4) ··· (3)

ついで、この算出された初期補正係数Ｋ１、Ｋ２、Ｋ３を用いて式（４）〜（７）に示されるように新たな回転角速度Ｆ１ iを求めるようにしている。 Then, and to determine a new rotational angular velocities F1 i as shown in equation (4) to (7) using the initial correction coefficients K1, K2, K3 This calculated.
Ｆ１ 1 ＝Ｆ１ ・・・（４） F1 1 = F1 ··· (4)
Ｆ１ 2 ＝Ｋ１×Ｆ２ ・・・（５） F1 2 = K1 × F2 ··· ( 5)
Ｆ１ 3 ＝Ｋ３×Ｆ３ ・・・（６） F1 3 = K3 × F3 ··· ( 6)
Ｆ１ 4 ＝Ｋ２×Ｋ３×Ｆ４ ・・・（７） F1 4 = K2 × K3 × F4 ··· (7)

ここで、初期補正係数Ｋ１は、前左右タイヤ間の初期差異による有効ころがり半径の差を補正するための係数である。 Here, the initial correction coefficient K1 is a coefficient for correcting the difference in effective rolling radius due to an initial difference between left and right front tires. 初期補正係数Ｋ２は、後左右タイヤ間の初期差異による有効ころがり半径の差を補正するための係数である。 The initial correction coefficient K2 is a coefficient for correcting the difference in effective rolling radius due to an initial difference between right and left rear tires. 初期補正係数Ｋ３は、前左タイヤと後左タイヤとのあいだの初期差異による有効ころがり半径の差を補正するための係数である。 Initial correction coefficient K3 is a coefficient for correcting the difference in effective rolling radius before by initial difference between a left front tire and a left rear tire. そして、前記Ｆ１ iに基づき、各車輪のタイヤの車輪速度Ｖｉを算出する。 Based on the F1 i, calculates the wheel speeds Vi of the respective tires.

（１）車輪の速度情報が左側全車輪または右側全車輪（同サイドの２輪タイヤ）の平均車輪速度である場合 （ｉ） Ｉ＝{（前軸左または右側の車輪速度＋後軸左または右側の車輪速度）／２}／Ｖ (1) if the speed information of a wheel is the average wheel speeds of the left all the wheels or the right all the wheels (2 wheel tires of the same side) (i) I = {(front axle left or right side of the wheel speed + rear axle left or right wheel speed) / 2} / V
（ｉｉ）Ｉ＝{（前軸左または右側の車輪速度＋後軸左または右側の車輪速度）／２}−Ｖ (Ii) I = {(front axle left or right side of the wheel speed + rear axle left or right wheel speed) / 2} -V
（２）車輪の速度情報が前輪２輪タイヤまたは後輪２輪タイヤの平均車輪速度である場合 （ｉ） Ｉ＝{（前または後軸の左側の車輪速度＋前または後軸の右側の車輪速度）／２}／Ｖ (2) the right wheels of the wheel when the speed information is the average wheel speed of the front wheels 2 tires or two rear tires (i) I = {(left wheel speeds + before or rear axle of the front or rear axle speed) / 2} / V
（ｉｉ）Ｉ＝{（前または後軸の左側の車輪速度＋前または後軸の右側の車輪速度）／２}−Ｖ (Ii) I = {(right wheel speeds of the left wheel speeds + before or rear axle of the front or rear axle) / 2} -V
（３）車輪の速度情報が対角線上の車輪タイヤの平均車輪速度と他の対角線上の車輪タイヤの平均車輪速度である場合 （ｉ） Ｉ＝［{（Ｖ２＋Ｖ３）／２}／Ｖ］／［{（Ｖ１＋Ｖ４）／２}／Ｖ］ (3) if the speed information of a wheel is the average wheel speed of the wheel tires on the average wheel speeds and other diagonal of wheel tires on diagonal (i) I = [{(V2 + V3) / 2} / V] / [ {(V1 + V4) / 2} / V]
（ｉｉ）Ｉ＝［{（Ｖ２＋Ｖ３）／２}／Ｖ］−［{（Ｖ１＋Ｖ４）／２}／Ｖ］ (Ii) I = [{(V2 + V3) / 2} / V] - [{(V1 + V4) / 2} / V]
（４）車輪の速度情報が４輪タイヤの平均車輪速度である場合 （ｉ） Ｉ＝{（Ｖ１＋Ｖ２＋Ｖ３＋Ｖ４）／４}／Ｖ (4) if the speed information of a wheel is the average wheel speed of the four wheel tires (i) I = {(V1 + V2 + V3 + V4) / 4} / V
（ｉｉ）Ｉ＝{（Ｖ１＋Ｖ２＋Ｖ３＋Ｖ４）／４}−Ｖ (Ii) I = {(V1 + V2 + V3 + V4) / 4} -V
（５）車輪の速度情報が各車輪タイヤの車輪速度Ｖｉ（ｉ＝１〜４）である場合 （ｉ） Ｉ＝Ｖｉ／Ｖ (5) if the speed information of a wheel is the wheel velocity Vi of each wheel tires (i = 1~4) (i) I = Vi / V
（ｉｉ）Ｉ＝Ｖｉ−Ｖ (Ii) I = Vi-V

つぎに本発明を実施例に基づいて説明するが、本発明はかかる実施例のみに限定されるものではない。 Next will be described the present invention based on examples, but the present invention is not limited only to these examples.

［実施例１］ [Example 1]

ついで４輪タイヤの空気圧を２０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires by vacuum 20%, was subjected to the running test. このときの車輪位置の判定値は表２に示されるように０．０２００４であった。 Determination value of the wheel position at this time was 0.02004 As shown in Table 2.

ついで４輪タイヤの空気圧を４０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires under reduced pressure of 40%, was subjected to the running test. このときの車輪位置の判定値は表３に示されるように０．０２００８であった。 Determination value of the wheel position at this time was 0.02008 As shown in Table 3.

これに対し、４０％減圧では基準値からの変化率は、表５に示されるように左右の同サイドの２輪タイヤとも０．４％である。 In contrast, the 40% pressure reduction rate of change from the reference value is 0.4% Both wheel tires of the left and right of the side as shown in Table 5. したがって、この０．４％の変化を前記しきい値０．３％と比較すると、しきい値の方が小さいので、左右両側で減圧していると判定されるため、４輪タイヤの減圧警報が発せられた。 Therefore, when comparing the change in the 0.4% and the threshold value of 0.3%, since the direction of the threshold is small, since it is determined that the vacuum in the left and right sides, vacuum alarm 4 wheel tires It has been issued.

なお、本実施例では、左右の同サイドの２輪タイヤが同時に減圧している場合の走行試験を行なったが、左サイドの２輪タイヤまたは右サイドの２輪タイヤが同時に減圧している場合の走行試験を行なうことにより、同サイド（左側または右側）の２輪タイヤが同時に減圧していることも判定することができる。 In the present embodiment, although subjected to running tests in the case of two-wheel tires of the left and right of the same side are simultaneously decompressed, if two wheel tires of two wheel tires or the right side of the left side are simultaneously decompressed by performing the running test, two-wheel tire of the same side (left or right) can also be determined to have simultaneously decompressed.

［実施例２］ [Example 2]

ついで４輪タイヤの空気圧を２０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires by vacuum 20%, was subjected to the running test. このときの前軸および後軸の車輪位置の判定値は表７に示されるようにそれぞれ０．０２００４および０．０１５０４であった。 Determination value of the wheel positions of the front axle and the rear axle in this case was, respectively 0.02004 and 0.01504, as shown in Table 7.

ついで４輪タイヤの空気圧を４０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires under reduced pressure of 40%, was subjected to the running test. このときの前軸および後軸の車輪位置の判定値は表８に示されるようにそれぞれ０．０２００８および０．０１５０８であった。 Determination value of the wheel positions of the front axle and the rear axle in this case was, respectively 0.02008 and 0.01508, as shown in Table 8.

これに対し、４０％減圧では前軸および後軸の基準値からの変化率は、表１０に示されるように前軸の２輪タイヤでは０．４％であり、後軸の２輪タイヤでは０．５４％である。 In contrast, the rate of change from the reference value of the front axle and rear axle is 40% reduced pressure, 0.4% in the two-wheel tires of the front axis, as shown in Table 10, in two-wheel tires of the rear shaft it is 0.54%. したがって、これらの変化を前記しきい値０．３％と比較すると、しきい値の方が小さいので、前軸および後軸の２輪タイヤで減圧していると判定されるため、４輪タイヤの減圧警報が発せられた。 Therefore, if these changes are compared with the threshold value of 0.3%, since it is determined that since the direction of the threshold is small, a decreased pressure in two-wheel tires of the front axis and rear axle, four wheel tires decompression alarm is issued.

なお、本実施例では、前軸および後軸の２輪タイヤが同時に減圧している場合の走行試験を行なったが、前軸の２輪タイヤまたは後軸の２輪タイヤが同時に減圧している場合の走行試験を行なうことにより、前軸または後軸の２輪タイヤが同時に減圧していることも判定することができる。 In the present embodiment, although two-wheel tires of the front shaft and rear axle makes a running test in the case of being reduced pressure at the same time, two wheel tires of two wheel tires or the rear axle of the front axle is simultaneously decompressed by performing the running test case, two wheel tires of the front axle or rear axle can also be determined to have simultaneously decompressed.

［比較例１］ [Comparative Example 1]

ついで４輪タイヤの空気圧を２０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires by vacuum 20%, was subjected to the running test. このときの車輪位置の判定値は０．０２００４であった。 Determination value of the wheel position at this time was 0.02004.

ついで４輪タイヤの空気圧を４０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires under reduced pressure of 40%, was subjected to the running test. このときの車輪位置の判定値は０．０２００８であった。 Determination value of the wheel position at this time was 0.02008.

これに対し、４０％減圧では基準値からの変化率は０．４％である。 In contrast, the 40% pressure reduction rate of change from the reference value is 0.4%. したがって、この０．４％の変化を前記しきい値０．３％と比較すると、しきい値の方が小さいので、４輪タイヤの減圧警報が発せられた。 Therefore, when the change in 0.4% compared with the threshold value of 0.3%, since the direction of the threshold is small, vacuum alarm four wheel tires is issued.

なお、本比較例では、４輪タイヤが同時に減圧している場合の走行試験を行なったが、１輪タイヤ（たとえば左前輪タイヤ）および２輪タイヤ（たとえば前軸の２輪タイヤや左同サイドの２輪タイヤ）についても、同様に減圧を判定することができることがわかった。 In the present comparative example, was subjected to running tests in the case of four wheel tires is simultaneously decompressed, one wheel tire (e.g. left front tire) and two-wheel tire (e.g. two-wheel tires and left the side of the front axle for even the two wheel tires), it was found that it is possible to determine similarly reduced pressure.

［実施例３］ [Example 3]

ついで４輪タイヤの空気圧を２０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires by vacuum 20%, was subjected to the running test. このときの各車輪タイヤの車輪位置の判定値は表１２に示されるようにそれぞれ算出した。 Determination value of the wheel positions of the respective wheel tires of this time was calculated, respectively, as shown in Table 12.

ついで４輪タイヤの空気圧を４０％減圧して、前記走行試験を行なった。 Then the air pressure of 4 wheel tires under reduced pressure of 40%, was subjected to the running test. このときの前軸および後軸の車輪位置の判定値は表１３に示されるようにそれぞれ算出した。 Determination value of the wheel positions of the front axle and rear axle at this time were calculated respectively as shown in Table 13.

これに対し、４０％減圧では各車輪タイヤの前軸および後軸の基準値からの変化率は、表１５に示されるように前軸の２輪タイヤでは０．４％であり、後軸の２輪タイヤでは０．５４％である。 In contrast, the rate of change from the reference value of the front axle and rear axle of the respective wheel tires in the 40% reduced pressure, 0.4% in the two-wheel tires of the front axis, as shown in Table 15, the rear axle in the two-wheel tire is 0.54%. したがって、これらの変化を前記しきい値０．３％と比較すると、しきい値の方が小さいので、各車輪タイヤで減圧していると判定されるため、４輪タイヤの減圧警報が発せられた。 Therefore, if these changes are compared with the threshold value of 0.3%, since the direction of the threshold is small, since it is determined that the pressure reduction, the pressure reduction warning 4 wheel tires emitted by the respective wheel tires It was.

なお、本実施例では、各車輪タイヤが同時に減圧している場合の走行試験を行なったが、１輪タイヤや複数輪タイヤの減圧も判定することができる。 In the present embodiment has been carried out running tests when the respective wheel tires are simultaneously decompressed, it can also be determined decompression of one wheel tires and more wheel tire.

たとえば左前輪タイヤ（１輪タイヤ）のみ４０％減圧させた場合の前軸および後軸の車輪位置の判定値は、表１６に示されるようにそれぞれ算出された。 For example the determination value of the wheel positions of the front axle and the rear axle in the case of reducing the pressure only 40% left front tire (1 wheel tires) were calculated respectively as shown in Table 16.

また、前軸の２輪タイヤのみ４０％減圧させた場合の前軸および後軸の車輪位置の判定値は、表１８に示されるようにそれぞれ算出された。 Also, the determination value of the wheel positions of the front axle and the rear axle in the case of reducing the pressure only 40% two-wheel tires of the front shaft, calculated respectively as shown in Table 18.

さらに左同サイドの２輪タイヤのみ４０％減圧させた場合の前軸および後軸の車輪位置の判定値は、表２０に示されるようにそれぞれ算出された。 Determination value of the wheel positions of the front axle and the rear axle when further was only 40% under reduced pressure 2-wheel tires on the left the side were calculated respectively as shown in Table 20.

１ 車輪速度検出手段 ２ 制御ユニット ３ 表示器 ４ 初期化ボタン ５ 警報器 1 the wheel speed detecting means 2 control unit 3 display 4 initialization button 5 alarm

## Claims (5)

1. 車両に装着したタイヤから得られる車輪回転情報に基づいてタイヤ空気圧の低下を検出するタイヤ空気圧低下検出方法であって、前記各タイヤの車輪回転情報を検出する工程と、車体速度を求める工程と、該車輪回転情報から、右サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および左サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出または、前輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および後輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出する工程と、各タイヤの車輪回転情報と前記車輪位置の車輪の速度情報を記憶する工程と、前記車輪位置の車輪の速度情報と車体速度とを比較して、前記車輪位置の判定 A tire pressure drop detecting method for detecting decrease in tire air pressure based on wheel rotation information obtained from tires attached to a vehicle, a step of detecting wheel rotation information of the respective tires, a step of determining a vehicle speed, from wheel rotational information, it calculates the wheel speed information consisting of wheel rotational information of the wheel position relative to the wheel of the two wheels of the wheel speed information and the left side consisting of wheel rotational information of the wheel position relative to the wheel of the two wheels on the right side, or, calculating a wheel speed information consisting of a wheel rotational information of the wheel position relative to the wheel of the wheel speed information and the two rear wheels consisting of a wheel rotational information of the wheel position relative to the wheel of the two front wheels, each tire a step of storing the wheel speed information of the wheel rotation information and the wheel position, by comparing the speed information and the vehicle speed of a wheel of the wheel position, the determination of the wheel position を算出する工程と、予め規定内圧時における前記車輪位置の車輪の速度情報と車体速度を比較して得られる前記車輪位置の基準値と前記車輪位置の前記判定値を比較する工程と、当該基準値と判定値の比較値と所定のしきい値との関係に基づいて、タイヤの空気圧低下を判定する工程を含むタイヤ空気圧低下検出方法。 Calculating a, a step of comparing the determined value of the wheel position and the reference value of the wheel position obtained by comparing the speed information and the vehicle speed of a wheel of the wheel position at a predefined pressure, the reference based on the relationship between the value and the comparison value of the determination value with a predetermined threshold value, the tire pressure drop detecting method comprising the step of determining decrease in tire air-pressure.
2. 前記車体速度をＧＰＳ電波を受信した信号と時間により求める請求項１記載のタイヤ空気圧低下検出方法。 Tire pressure drop detecting method according to claim 1, wherein determining by said vehicle speed signal and the time that has received the GPS radio waves.
3. 車両に装着したタイヤから得られる車輪回転情報に基づいてタイヤ空気圧の低下を検出するタイヤ空気圧低下検出装置であって、前記各タイヤの車輪回転情報を検出する車輪速度検出手段と、車体速度を求める車体速度演算手段と、該車輪回転情報から、右サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および左サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出または、前輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および後輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出する速度情報演算手段と、各タイヤの車輪回転情報と前記車輪位置の車輪の速度情報を記憶する記憶手段と、前記車輪位置の車輪の速度情報と A tire pressure drop detection DeSo location for detecting a decrease in tire air pressure based on wheel rotation information obtained from tires attached to a vehicle, a wheel speed detecting means for detecting a wheel rotational information of the respective tires, the vehicle speed a vehicle speed calculating means for obtaining a from wheel rotation information, the wheel rotation information of wheel position relative to the wheel of the two wheels of the wheel speed information and the left side consisting of wheel rotational information of the wheel position relative to the wheel of the two wheels on the right side calculating the speed information of the wheels comprising, or the wheel speed information of consisting of wheel rotational information of the wheel position relative to the wheel of the wheel speed information and the two rear wheels consisting of a wheel rotational information of the wheel position relative to the wheel of the two front wheels a speed information calculation means for calculating, storing means for storing the wheel speed information of the wheel position and wheel rotation information of the respective tires, and speed information of a wheel of the wheel position 体速度とを比較して、前記車輪位置の判定値を算出する判定値演算手段と、予め規定内圧時における前記車輪位置の車輪の速度情報と車体速度を比較して得られる前記車輪位置の基準値と前記車輪位置の前記判定値を比較する比較手段と、当該基準値と判定値の比較値と所定のしきい値との関係に基づいて、タイヤの空気圧低下を判定する減圧判定手段とを備えてなるタイヤ空気圧低下検出装置。 By comparing the body velocity, the wheel position and judgment value calculating means for calculating a judgment value of the reference of the wheel position obtained by comparing the speed information and the vehicle speed of a wheel of the wheel position at a predefined pressure comparing means for comparing the determined value of the value wheel position, based on the relationship between the comparison value with a predetermined threshold value of the reference value and the decision value, and a decompression judging means for judging decrease in tire air-pressure with tire pressure drop detecting device comprising.
4. 前記車体速度をＧＰＳ電波を受信した信号と時間により求める請求項３記載のタイヤ空気圧低下検出装置。 Tire pressure drop detecting device according to claim 3, wherein determining by the signal and time of the vehicle body speed that has received the GPS radio wave.
5. 車両に装着したタイヤから得られる車輪回転情報に基づいてタイヤ空気圧の低下を判定するためにコンピュータを、該車輪回転情報から、右サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および左サイドの２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出または、前輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報および後輪２輪の車輪に対する車輪位置の車輪回転情報からなる車輪の速度情報を算出する速度情報演算手段、各タイヤの車輪回転情報と前記車輪位置の車輪の速度情報を記憶する記憶手段、前記車輪位置の車輪の速度情報と求められた車体速度とを比較して、前記車輪位置の判定値を算出する判定値演算手段、予め規定内圧時における前記車輪 A computer to determine a decrease in tire air pressure based on wheel rotation information obtained from tires attached to a vehicle, from the wheel rotational information, the wheel comprising a wheel rotational information of the wheel position relative to the wheel of the two wheels on the right side calculating wheel speed information consisting of wheel rotational information of the wheel position relative to the wheel of the two wheels of the speed information and the left side, or, wheel speed information and the rear wheel 2 consisting of wheel rotational information of the wheel position relative to the wheel of the two front wheels velocity information calculation means for calculating the wheel speed information of consisting of wheel rotational information of the wheel position relative to the wheel of the wheels, storage means for storing the wheel speed information of the wheel position and wheel rotation information of each tire, the wheel position by comparing the vehicle speed obtained with the wheel speed information, the determination value calculation means for calculating a judgment value of said wheel position, said at predefined pressure wheel 置の車輪の速度情報と車体速度を比較して得られる前記車輪位置の基準値と前記車輪位置の前記判定値を比較する比較手段、当該基準値と判定値の比較値と所定のしきい値との関係に基づいて、タイヤの空気圧低下を判定する減圧判定手段として機能させるためのタイヤ減圧判定のプログラム。 Comparing means for comparing the judgment value of the reference value and the wheel position of the wheel position obtained by comparing the speed information and vehicle speed of the wheels of the location, the comparative value of the reference value and the determination value with a predetermined threshold value based on the relationship between, tire deflation judgment program for functioning as a decompression judging means for judging decrease in tire air-pressure.
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JP2003393594A JP4086763B2 (en) 2003-11-25 2003-11-25 Tire pressure drop detecting method and apparatus, as well as a tire program for judging decompression of
DE200460029642 DE602004029642D1 (en) 2003-11-25 2004-10-21 Method and apparatus for detecting a pressure drop in the tire, and the program for judging a drop in pressure in the tire
EP20040025089 EP1547828B1 (en) 2003-11-25 2004-10-21 Method for detecting decompression of tires and device thereof, and program for judging decompression of tires
US10/977,440 US7551992B2 (en) 2003-11-25 2004-11-01 Detecting tire decompression based on wheel speed
KR1020040093629A KR100875405B1 (en) 2003-11-25 2004-11-16 A method for detecting the pressure of the tire and an apparatus, and reading in the pressure to determine the computer program is recorded in a recording medium of the tire
US12/155,720 US7831346B2 (en) 2003-11-25 2008-06-09 Method for detecting decompression of tires and device thereof, and program for judging decompression of tires

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