JPH0995223A - Vehicular different diameter wheel judging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the mis-judge of a different diameter wheel by detecting the continuing time in which the difference of both wheel speed is more than a prescribed value by a first detection means, the continuing time in which the difference is below a prescribed value by a second detection means and carrying out the different diameter wheel judgement or the different diameter wheel judgement release when the first/ second detection means reach respective judgement standard time. SOLUTION: A different shape type mounting judgement is concluded and a signal for showing the mounting of the different iameter wheel is outputted, when the wheel speed difference of respective wheels calculated by wheel speed sensors 13... is more than a prescribed value and the count value of a different shape tyre mounting judgement counter 5 is more than a first prescribed value. When the wheel speed difference is below a prescribed value and the count value of a four wheel normal judgement counter 6 is more than a second prescribed value, a signal for showing a normal four wheel is outputted by no existence of the different diameter wheel. In this case, the first/second prescribed values are corresponded to a first/second judgement standard time respectively and it is set to the first prescribed value >= the second prescribed value. As this result, the main cause of misjudgement generated unexpectedly and settled at a short time is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for determining whether or not any one of all four wheels of a vehicle has a different diameter from the other wheels, that is, whether or not the wheel has a different diameter. The present invention relates to a different diameter wheel determination device.

[0002]

2. Description of the Related Art Various braking control systems have been adopted in vehicles from the viewpoint of ensuring running safety, and one of them is, for example, an anti-skid brake control (hereinafter simply referred to as "ABS control") system. . Such ABS control is intended to prevent the wheels from locking to the road surface during braking, and a wheel speed sensor provided on each wheel to detect the rotation speed (that is, the wheel speed) of each wheel of the vehicle. The brake tendency of the wheel cylinder is controlled by detecting the wheel speed and determining the wheel lock tendency from the detected wheel speed and the vehicle body speed of the vehicle calculated based on the detected wheel speed. Therefore, in the braking control such as the ABS control, the reliability of the control greatly depends on whether the wheel speed, which is the most important control information, is determined to be good or accurately.

For this reason, conventionally, the detected value of the wheel speed detected by the wheel speed sensor is corrected from various points of view, and the accuracy is further improved before being used for actual braking control. One of the correction items for the wheel speed is a wheel diameter difference correction (for example, Japanese Patent Publication No. 4-242).
No. 64).

[0004]

By the way, this diameter difference correction is carried out in the case where any one of the four wheels of the vehicle has a smaller diameter than the other wheels, for example, a certain wheel. In the case where an emergency tire having a diameter smaller than that of a regular tire is mounted, if the wheel speed of each wheel detected by the wheel speed sensor is directly input to the ABS control, the wheel speed of the wheel having a smaller diameter will be different. The wheel speeds of the three wheels are extremely large compared to the wheel speeds of the other three wheels, and the other three wheels are judged to be "locked", and the brakes tend to come off. To reduce the correction. Therefore, in correcting the diameter difference of the wheel speed, different-diameter wheel determination control for determining the presence or absence of the different-diameter wheel is necessary as the control in the previous stage, and the different-diameter wheel determination is required to be accurate. It is something.

However, in determining such a different diameter wheel,
This can be misjudged for various reasons. That is, even if all four wheels are fitted with tires of the same diameter, and if there is no possibility that different-diameter wheels should not be judged,
For example, if the drive wheels spin due to excessive acceleration of the vehicle, if the drive wheels spin during rough road travel, or if one wheel slips on a low μ road surface, Since the wheel speed difference becomes large, there is a possibility that a specific wheel (for example, the driving wheel when the driving wheel spins) is erroneously determined to have a smaller diameter than the other wheels. When the erroneous determination of the different diameter wheel is made, the wheel speed of the wheel determined to be the different diameter wheel is corrected to the decreasing side by the diameter difference correction based on the erroneous determination, and the wheel is "locked". Therefore, unnecessary brake control is performed, which may adversely affect the stable running performance of the vehicle in some cases.

However, few effective proposals have been made to prevent the erroneous determination of the different diameter wheel, and a technique for preventing the wrong determination of the different diameter wheel has been developed from the viewpoint of improving the reliability of vehicle braking control. It has been requested in advance.

Therefore, the invention of the present application was made as an attempt to provide a different diameter wheel determination device for a vehicle capable of preventing erroneous determination of different diameter wheels as much as possible and making highly reliable determination of different diameter wheels. is there.

[0008]

In the present invention, the following constitution is adopted as a concrete means for solving such a problem.

In the first invention of the present application, a wheel speed sensor provided on each wheel of the vehicle for detecting the wheel speed of each wheel is compared with a wheel speed detection value detected by each wheel speed sensor. Wheel speed comparison means, first detection means for detecting the duration of a state in which the difference between the wheel speed detection value of one wheel and the wheel speed detection value of another wheel is greater than or equal to a predetermined value, and the difference is less than or equal to a predetermined value. And a second detecting means for detecting the duration of the state, and when the duration of detection by the first detecting means reaches the first determination reference time, the different diameter wheel determination is performed and the detection by the second detecting means is performed. When the continuation time reaches the second determination reference time, the different diameter wheel determination is canceled and the first
It is characterized in that the second judgment reference time is set shorter than the judgment reference time.

According to a second invention of the present application, in the vehicle different diameter wheel determination device according to the first invention, the detection durations of the first detection means and the second detection means are both equal to or more than the predetermined difference. It is characterized in that it is a continuous duration time when the state of 1 or the state of not more than a predetermined value continues.

According to a third invention of the present application, in the vehicle different diameter wheel determination device according to the first invention, both of the detection durations of the first detecting means and the second detecting means are equal to or more than the predetermined difference. Or the state below the predetermined value is the cumulative time within the predetermined period when the state continues intermittently within the predetermined period.

According to a fourth aspect of the present invention, in the different diameter wheel determination device for a vehicle according to the first aspect, a bad road state detecting means for detecting a bad road state of a road surface is provided, and the first determination reference time is provided. Is set to be longer when traveling on a rough road than when traveling on a rough road.

According to a fifth aspect of the present invention, in the different diameter wheel determination device for a vehicle according to the first aspect, a bad road condition detecting means for detecting a bad road condition of a road surface is provided, and the second determination reference time is provided. Is set to be shorter when traveling on a rough road than when traveling on a rough road.

According to a sixth aspect of the present invention, in the vehicle different diameter wheel determination device according to the first aspect, a bad road state detecting means for detecting a bad road state of a road surface is provided, and when the vehicle is running on a bad road,
The first determination reference time is set to be longer than that when traveling on a non-bad road, and the second determination reference time is set to be shorter than that when traveling on a bad road.

In the seventh invention of the present application, a wheel speed sensor provided on each wheel of the vehicle for detecting the wheel speed of each wheel is compared with a wheel speed detection value detected by each wheel speed sensor. And a wheel speed comparing means for performing one of the operations of increasing or decreasing the count value by a unit amount when the difference between the wheel speed detection value of one wheel and the wheel speed detection value of another wheel is greater than or equal to a predetermined value. And a second counting operation in which the other one of the operations of increasing or decreasing the count value by a unit amount when the count value is equal to or less than a predetermined value is performed.
A counting means for selecting and executing a counting mode, and when the cumulative count value in the first counting mode by the counting means is equal to or larger than the first determination reference count value, the different diameter wheel determination is performed, and the second counting method is performed. When the cumulative count value in the counting mode is equal to or greater than the second determination reference count value, the different diameter wheel determination is canceled, and
The second determination reference count value is set to be smaller than the first determination reference count value.

According to an eighth aspect of the present invention, in the vehicle different diameter wheel determination device according to the seventh aspect, a bad road condition detecting means for detecting a bad road condition of a road surface is provided, and the first determination reference count is provided. It is characterized in that the value is set to a larger value when traveling on a bad road than when traveling on a bad road, and the second determination reference count value is set to a value smaller when traveling on a bad road than when traveling on a bad road.

In a ninth aspect of the present invention, a wheel speed sensor provided on each wheel of the vehicle for detecting the wheel speed of each wheel is compared with a wheel speed detection value detected by each wheel speed sensor. Wheel speed comparing means, and one of the operation of increasing or decreasing the count value by a unit amount when the difference between the wheel speed detection value of one wheel and the wheel speed detection value of another wheel is greater than or equal to a predetermined value. And a second counting mode for performing one of the other operations of increasing or decreasing the count value by a unit amount when the count value is less than or equal to a predetermined value, and counting means for executing the selected second counting mode. When the cumulative count value in the first counting mode by the counting means is equal to or greater than the first determination reference count value, the different diameter wheel determination is performed, and the cumulative cow in the second counting mode is performed. When the measured value is equal to or greater than the second determination reference count value, the different diameter wheel determination is canceled, and the unit amount in the first counting mode is set to be larger than the unit amount in the second counting mode. Is characterized by being set small.

According to a tenth aspect of the present invention, in the vehicle different diameter wheel determination device according to the ninth aspect, a bad road condition detecting means for detecting a bad road condition of a road surface is provided, and the first judgment reference count is provided. The value is set to be larger when traveling on a rough road than when traveling on a bad road, and the second determination reference count value is set to be smaller when traveling on a rough road than when traveling on a bad road.

In the eleventh aspect of the present invention, a wheel speed sensor provided on each wheel of the vehicle for detecting the wheel speed of each wheel and a wheel speed detection value detected by each wheel speed sensor are compared. Wheel speed comparing means, and a plurality of counting means provided respectively corresponding to each wheel, the difference between the wheel speed detection value of one wheel and the wheel speed detection value of the other wheels is more than a predetermined value. At one time, for one of the wheels, one of the operations for increasing or decreasing the count value by a unit amount is performed in the corresponding counting means, and for the other wheels, the counting means corresponding to each of the wheels is operated. While performing one of the other operations of increasing or decreasing the count value by a unit amount, the cumulative count value of any one of the plurality of counting means. Is greater than or equal to the third determination reference count value, a different-diameter wheel determination of the wheel corresponding to the counting means is performed, and when all accumulated count values of the plurality of counting means are less than or equal to the fourth determination reference count value, different diameters are determined. The wheel determination is released, and the unit amount during one operation of the counting means is set to a value smaller than the unit amount during the other operation.

According to a twelfth aspect of the present invention, in the vehicle different diameter wheel determination device according to the eleventh aspect, a bad road condition detecting means for detecting a bad road condition of a road surface is provided and the third judgment reference count is provided. Different diameter wheel judgment of vehicle characterized in that the value is set to be larger when traveling on a rough road than when traveling on a non-bad road, and the fourth determination reference count value is set to be smaller when traveling on a bad road than when traveling on a bad road. apparatus.

[0021]

According to the present invention, the following effects can be obtained by adopting such a configuration.

(B) According to the different diameter wheel determination device for a vehicle according to the first invention of the present application, the first difference diameter wheel reference is used as a reference.
By setting the second determination reference time, which is the reference for canceling the determination of the different diameter wheel, to be shorter than the determination reference time, erroneous determination of the different diameter wheel is prevented as much as possible. That is, it is considered that the cause of the erroneous determination of the different-diameter wheel (that is, the excessive increase in the wheel speed of the specific one wheel) occurs temporarily and for a relatively short time during the traveling of the vehicle. Therefore, the first reference that is the criterion for the different diameter wheel determination
It is determined that the four wheels are normal by setting the determination reference time shorter than the second determination reference time that is the reference for canceling the different-diameter wheel determination (that is, determining that all four wheels are normal). Is made earlier, and the chances of different diameter ring judgment are reduced accordingly, and even if a phenomenon that causes erroneous judgment of different diameter wheels occurs, this phenomenon disappears before it is actually wrongly judged as different diameter wheels. However, erroneous determination is avoided, and as a synergistic effect of these, erroneous determination of different diameter wheels is prevented as much as possible.

(B) According to the different diameter wheel determination device for a vehicle according to the second aspect of the present invention, the difference between the wheel speed detection value of one wheel and the wheel speed detection value of the other wheel is equal to or greater than a predetermined value. The condition of different diameter wheels and the determination of different diameter wheels are canceled based on the duration when the state or the state of being less than a predetermined value continues continuously. However, the wheel speed difference due to the phenomenon that causes an erroneous judgment is rarely continued continuously for a long time, and therefore the different diameter wheel judgment is canceled (that is, the normal judgment is made). ) Is made earlier, and on the contrary, it becomes difficult to make the determination of the different diameter wheel. As a result, the effect of preventing erroneous determination of the different diameter wheel as described in (a) above can be further ensured.

(C) According to the different diameter wheel determination device for a vehicle according to the third aspect of the present invention, the difference between the wheel speed detection value of one wheel and the wheel speed detection value of the other wheel is a predetermined value or more. When the state or the state of being less than or equal to the predetermined value continues intermittently within the predetermined period, the different diameter ring determination and the different diameter ring determination cancellation are performed based on the accumulated time within the predetermined period. Considering this, the wheel speed difference in the case where all four wheels are normal occurs frequently even if it is intermittent, but the wheel speed difference based on the phenomenon that causes the misjudgment is intermittent. Is rarely repeated, therefore, when judging with these accumulated times, it is easy to cancel the different diameter ring judgment (that is, normal judgment), and conversely it is difficult to make the different diameter ring judgment. As a result, in (a) above The effect of preventing erroneous determination of different diameter wheels as described above can be further ensured.

(D) According to the different diameter wheel determination device for a vehicle according to the fourth aspect of the present invention, the first difference diameter wheel determination reference is used.
Since the judgment reference time is set longer when driving on rough roads than when driving on non-bad roads, the judgment reference time is likely to occur when driving on rough roads, which is likely to cause a phenomenon such as a spin of the driving wheels that causes a wrong judgment of different diameter wheels As a result, the determination of the different diameter wheel becomes difficult because of the longer length, and the effect of preventing erroneous determination of the different diameter wheel as described in (a) above can be further ensured.

(E) According to the different diameter wheel determination device for a vehicle according to the fifth aspect of the present invention, the second determination reference time, which is the reference for canceling the different diameter wheel determination, is set at Since it is set shorter than that, when the vehicle is traveling on a non-bad road where a phenomenon that causes an erroneous determination of the different diameter wheel such as spin of the driving wheel is unlikely to occur, the different diameter wheel determination is released for a short determination reference time (that is, Four wheels normality determination) is facilitated, and as a result, the effect of preventing erroneous determination of a different diameter wheel as described in (a) above can be further ensured.

(F) With the different diameter wheel determination device for a vehicle according to the sixth aspect of the present invention, the first determination reference time, which serves as a reference for different diameter wheel determination when traveling on a rough road, is set to be longer than that when traveling on a bad road. Since it is set long and the second judgment reference time, which is the reference for canceling the different diameter wheel judgment, is set shorter than when driving on a bad road, the effects described in (d) and (e) above can be achieved at the same time. As a result, the effect of preventing erroneous determination of the different diameter wheel as described in (a) above can be further ensured.

(G) According to the different diameter wheel determination device for a vehicle according to the seventh aspect of the present invention, the difference between the wheel speed detection value of one wheel and the wheel speed detection value of the other wheel is equal to or greater than a predetermined value. Occasionally, the first count mode in which either one of the operations for increasing or decreasing the count value by the unit amount is performed, and the other one of the operations for increasing or decreasing the count value in the unit amount when the predetermined value or less is performed. A second determination reference count serving as a reference for canceling the determination of the different diameter ring than the first determination reference count value serving as the reference of the different diameter ring determination, in which the second counting mode is selected and executed. Since the value is set small, erroneous determination of different diameter wheels is prevented as much as possible. That is, it is considered that the phenomenon that causes the erroneous determination of the different-diameter wheel occurs temporarily and for a relatively short time while the vehicle is traveling. Therefore, the first determination reference count value, which is the reference for the different diameter wheel determination, is set smaller than the second determination reference count value, which is the reference for the different diameter wheel determination cancellation (that is, the determination that all four wheels are normal). By doing so, it is judged that the four wheels are normal, and the chances of different diameter ring judgment are reduced accordingly, and even if a phenomenon that causes a wrong judgment of different diameter wheels occurs, this is actually different. This phenomenon disappears before the erroneous determination as a radial ring, and the erroneous determination is avoided, and as a synergistic effect of these, the erroneous determination of the different diameter ring is prevented as much as possible.

(H) According to the different diameter wheel determination device for a vehicle according to the eighth aspect of the present invention, the first difference diameter wheel reference is used.
Since the judgment reference count value is set to a larger value when driving on a bad road than when driving on a non-bad road, it is less likely to occur when driving on a bad road where a cause of erroneous determination of different diameter wheels is likely to occur The larger the judgment reference count value, the more difficult it is to make a different-diameter wheel judgment, and conversely, the second judgment reference count value that is the reference for canceling the different-diameter wheel judgment is a smaller value when driving on a rough road than when driving on a bad road. Since it is set to, the different diameter wheel judgment is easier to be released when driving on bad roads where erroneous determination of different diameter wheels is more likely to occur than when driving on bad roads. The prevention of erroneous determination of the different diameter wheel as described in (g) above can be further ensured.

(B) According to the different diameter wheel determination device for a vehicle according to the ninth aspect of the present invention, the difference between the wheel speed detection value of one wheel and the wheel speed detection value of the other wheel is a predetermined value or more. Occasionally, the first count mode in which either one of the operations for increasing or decreasing the count value by the unit amount is performed, and the other one of the operations for increasing or decreasing the count value in the unit amount when the predetermined value or less is performed. And a counting means for selecting and executing the second counting mode to be performed. In the second counting mode, the unit amount in the first counting mode serving as a reference for determining the different diameter ring is set to Since it is set to be smaller than the unit amount in the second counting mode, which is the reference, it is difficult to determine the different diameter wheel because the increase or decrease rate of the count value is small. Since the increase rate or the decrease rate of the gating value is large, this is easily done, and as a result, erroneous determination of the different diameter wheel is prevented as much as possible.

(V) According to the different diameter wheel determination device for a vehicle according to the tenth invention of the present application, in addition to the effect described in the above (i), the first determination standard serving as a reference for the different diameter wheel determination standard. While the count value is set to be larger when driving on a rough road than when driving on a bad road, the second determination reference count value, which is the standard for canceling the different-diameter wheel judgment, is set to be smaller than when driving on a bad road. Therefore, based on the magnitude relationship of the judgment reference count value, the different-diameter wheel judgment is made when driving on a bad road where a phenomenon that causes an erroneous judgment of a different-diameter wheel is likely to occur, compared to when driving on a non-bad road where this is less likely to occur. This makes it difficult to perform the determination of the different-diameter wheel, which makes it easier to prevent erroneous determination of the different-diameter wheel.

(L) According to the different diameter wheel determination device for a vehicle according to the eleventh invention of the present application, the wheel diameter of one wheel is increased according to the different diameter wheel determination device for a vehicle according to the twelfth invention of the present application. When the difference between the detected value and the detected wheel speed of the other wheels is more than a predetermined value, either one of the operations for increasing or decreasing the count value by a unit amount in the counting means corresponding to the one wheel is performed. For each of the other wheels, one of the plurality of counting means is operated while the other one of the operations of increasing or decreasing the count value by a unit amount is performed in each counting means corresponding to each of the wheels. When one cumulative count value is equal to or greater than the third determination reference count value, the different-diameter wheel determination of the wheel corresponding to the counting means is performed, and all the cumulative counts of the plurality of counting means are determined. In the case of canceling the different-diameter wheel determination when the count value is less than or equal to the fourth determination reference count value, the unit amount during one operation of each of the counting means is smaller than the unit amount during the other operation. Since it is set to a value, it is difficult to make the different diameter wheel judgment because the increase or decrease rate of the count value is small, and it is easy to cancel the different diameter wheel judgment because the increase rate or the decrease rate of the count value is large. As a result, erroneous determination of different diameter wheels is prevented as much as possible.

Further, in this case, when the difference between the detected wheel speed value of one wheel and the detected wheel speed value of another wheel is equal to or more than a predetermined value, the count value corresponding to this one wheel is counted by the corresponding counting means. Either one of the operations for increasing or decreasing by the unit amount is performed, and for the other wheels, the other operation of the operation for increasing or decreasing the count value by the unit amount in each counting means corresponding to each wheel. Since it is possible to discriminate between the one wheel and the other wheels, which of the four wheels of the vehicle is the different diameter wheel when the determination of the different diameter wheel is made. Can be specified.

(W) According to the different diameter wheel determination device for a vehicle according to the twelfth invention of the present application, in addition to the effect described in (l) above, a third determination criterion serving as a reference for the different diameter determination criterion is provided. The count value is set to be larger when driving on a rough road than when driving on a bad road, while the fourth judgment reference count value, which is the criterion for canceling the different diameter wheel judgment, is set to be smaller when driving on a rough road than when driving on a bad road. Therefore, based on the magnitude relationship of the judgment reference count value, the different-diameter wheel judgment is made when driving on a bad road where a phenomenon that causes an erroneous judgment of a different-diameter wheel is likely to occur, compared to when driving on a non-bad road where this is less likely to occur. This makes it difficult to perform the determination of the different-diameter wheel, and thus it becomes easier to prevent the wrong determination of the different-diameter wheel.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION A different diameter wheel determination device for a vehicle according to the present invention will be specifically described below based on preferred embodiments.

FIG. 1 shows a different diameter wheel determination device of the present invention,
1 shows an overall control system when incorporated as a pre-processing control in the ABS control of a vehicle. Here, the outline of the ABS control and the different diameter wheel determination control will be briefly described with reference to FIG.

In FIG. 1, reference numerals FR and FR are right front wheels and left front wheels which are driven wheels, respectively, and RR and RL are right rear wheels and left rear wheels which are both driven wheels, and the respective wheels FR, FL and R.
A brake including a wheel cylinder 11 and a brake disc 12 and a wheel speed sensor 13 for detecting the rotation speed of the wheel, that is, the wheel speed are mounted on the R and RL, respectively. Then, these wheel speed sensors 13, 1
The wheel speed of each wheel detected by 3, ... Is input to the control unit 4 as control information.

Further, the wheel cylinder 1 for each wheel described above.
Brake pipes 14 and 1 are respectively attached to 1, 11, ...
Brake fluid is supplied and discharged from the hydraulic unit 3 side via 5, 16 and 15, respectively, and the braking force is adjusted. That is, during the non-ABS control, the brake fluid pressure generated in the master cylinder 2 corresponding to the depression amount of the brake pedal 1 by the driver is applied to each wheel cylinder 1 described above.
, 11, ... On the other hand, during the ABS control, the hydraulic unit 3 operates in response to the control signal output from the control unit 4 in response to the lock tendency of each wheel, and the brake fluid pressure of the wheel cylinder 11 of the wheel having the lock tendency increases. By appropriately repeating the pressure and the pressure reduction, it is possible to prevent the wheel from locking.

In the ABS control, the control unit 4 receives the wheel speed information of each wheel from the wheel speed sensors 13, 13, ... As its control information, and the wheel speed of each wheel and the respective wheel speed information. The lock tendency of each wheel is determined by comparison with the pseudo vehicle body speed estimated based on the wheel speed, and a control signal is output to the hydraulic unit 3 correspondingly. The overall flow of this ABS control is shown in the flowchart of FIG.
That is, first, in step S1, wheel speed calculation or the like is performed as preprocessing, the road surface μ is estimated in step S2, and the pseudo vehicle body speed is estimated in step S3. Further, the slip value of each wheel is determined in step S4, and thereafter, the ABS control is actually executed (step S5).

In this case, since the wheel speed of each wheel is the most important control information in such ABS control, the detected wheel speed is required to be highly reliable. One method for ensuring the reliability of the wheel speed detection value is a wheel diameter difference correction described below, and as a premise of this diameter difference correction, there is already a different diameter wheel determination control targeted by the present invention. As mentioned above. The diameter difference correction and the different-diameter wheel determination are performed in step S1 of the above-described flowchart as a pre-process of the ABS control.

Hereinafter, the control for determining the presence / absence of the different diameter wheel will be described. First, the system configuration of the different diameter wheel determination device in FIG. 1 will be briefly described. In addition to the control unit 4 and the wheel speed sensors 13, 13 ... Provided on the wheels, respectively, a variant tire mounting determination counter 5 for determining that the wheels are fitted with variant tires, A four-wheel normality determination counter 6 for determining that all four wheels are normal (that is, no deformed tire is attached to any wheel), a bad road sensor 7 for detecting a bad road condition on the road surface, and The storage means 8 stores the reference value for determination.
However, here, for convenience of explanation of the entire system, the above-mentioned respective constituent members are illustrated, but different diameter wheel determination is not performed by operating all of these respective constituent members at the same time. The combination of constituent members is different for each form, and for example, one odd tire mounting determination counter 5
And 4 wheel normality determination counter 6 for different diameter wheel determination, when only one different tire mounting determination counter 5 is used for different diameter wheel determination, four different tire mounting determinations are provided for each wheel. Various combinations are adopted, such as when the different diameter wheels are determined by the counters 5, 5, ..., And when the bad road sensor 7 is combined with each of them to perform the different diameter wheel determination.

Here, prior to describing the different diameter wheel determination control for each embodiment, the idea common to these embodiments will be described.

Different diameter wheel determination in this different diameter wheel determination control (that is, it is determined that a modified tire having a diameter different from that of another wheel is mounted on one wheel) and a different diameter wheel determination release (that is, The determination that no variant tire is attached to any of the wheels) is made based on the comparison of the wheel speeds of the respective wheels. Due to various reasons as described above, there is a possibility that an erroneous determination that there is a different-diameter wheel (that is, a wheel on which a deformed tire is mounted) does not exist but is present. For this reason, it is necessary to prevent such erroneous determination as much as possible and perform more reliable different diameter ring determination, and it is the invention of the present application to realize this, and the basic idea as described below. The judgment control is performed below.

That is, as described above, the erroneous determination of the different-diameter wheel is made by comparing the wheel speed of one specific wheel with the wheel speed of the other wheel due to the spin of the drive wheel at the time of excessive acceleration, the slip at the time of entering the low μ road, and the like. However, all of these phenomena occur suddenly, and they converge in a relatively short time, whether continuous or intermittent. Considered to be of a nature. Therefore, when the different diameter wheel determination and the different diameter wheel determination cancellation (that is, the normality determination) are selectively performed based on the predetermined determination reference value, the determination reference value and the different diameter ring determination release at the time of the different diameter wheel determination are performed. If there is a difference with the judgment reference value at the time, and the setting of the difference is set so that the judgment reference value at the time of different diameter wheel judgment is larger than the judgment reference value at the time of cancellation of different diameter wheel judgment, Different-diameter ring judgment is relatively difficult to perform due to the magnitude of the judgment reference value, whereas different-diameter ring judgment is relatively easy to be executed.The phenomenon that causes erroneous judgment is sudden and short. Even if the phenomenon occurs, even if the phenomenon occurs, even if the phenomenon of different diameter ring determination is set relatively large despite the fact that it converges with time, before the different diameter ring determination is actually made. The phenomenon disappears (that is, before the judgment reference value is reached). The possibility is high, the like, possibly all four wheels are erroneous determination that there is a different-diameter ring despite normal is made it is considered that almost no.

The invention of the present application is based on this idea, and the embodiment of the invention is the different diameter wheel determination control in each embodiment described below. Hereinafter, control in the different diameter wheel determination device of the present invention will be specifically described based on each of the embodiments.

First Embodiment FIG. 3 shows a flowchart of different diameter wheel determination control as a preferred embodiment of the invention described in claims 1 to 3. This embodiment is provided with a variant tire mounting determination counter and a four-wheel normality determination counter as counters for collecting the material for determining the presence / absence of different diameter wheels, and the count value of the variant tire mounting determination counter is a predetermined determination reference count. When the value is equal to or greater than the value, "different diameter wheel determination" is performed, and when the count value of the four-wheel normality determination counter is equal to or greater than a predetermined determination reference count value, "different diameter wheel determination cancellation (that is, four-wheel normality determination)" is performed Has become. The different diameter wheel determination control will be described below with reference to this flowchart.

First, after the control is started, in step A1, the wheel speed sensor 1 corresponding to the wheel speed of each wheel.
It is calculated by calculation based on the detection signals of 3, 13 ,.

Next, in step A2, it is determined whether or not the vehicle is currently running steadily (that is, whether or not the vehicle is not being accelerated or decelerated). Here, when the vehicle is not traveling normally, there is a high risk of erroneous determination of wheels of different diameters due to spin of the drive wheels and the like, so in this case the control ends without any control.

On the other hand, when it is determined that the vehicle is currently traveling normally, the process proceeds to step A3, in which only one of all four wheels of the vehicle is compared with the other wheels. Whether or not the wheels are rotating at a high speed (that is, whether or not there is a possibility that different diameter wheels exist) is determined by comparing the wheel speeds of the respective wheels. Specifically, when the difference between the wheel speeds of the wheels is equal to or greater than a predetermined value, "there is a high possibility that there is a different diameter wheel", and when the difference is equal to or less than the predetermined value, "the possibility of a different diameter wheel is low"".

Here, "there is a high possibility that different diameter wheels exist".
If it is determined that the four-wheel normality determination counter is reset and the odd-shaped tire mounting determination counter is incremented in step A4. Then, in step A5, it is determined whether or not the count value of the variant tire attachment determination counter is equal to or greater than a first predetermined value. If the count value is determined to be equal to or greater than the first predetermined value, it is determined that the variant tire attachment determination is satisfied. A signal indicating the mounting of the radial wheel is output, and the control ends (step A6). On the other hand, when the count value is equal to or less than the first predetermined value, the control is ended as it is.

On the other hand, if it is determined in step A3 that "the possibility of the existence of the different diameter wheel is low", the count value of the four-wheel normality determination counter is set to the second value in step A7.
It is determined whether or not the value is equal to or more than a predetermined value, and if the value is equal to or more than the second predetermined value, it is determined that there is no different diameter wheel, the shape tire attachment determination is reset, a signal indicating "four-wheel normal" is output, and the control ends. (Step A9). On the other hand, if the count value is less than or equal to the second predetermined value, the control ends as it is.

Here, the first predetermined value that serves as the criterion for determining the different diameter ring and the second value that serves as the criterion for canceling the different diameter ring determination.
The predetermined value corresponds to the “first determination reference time” and the “second determination reference time” in the claims, respectively, and the magnitude relationship between them is “first predetermined value ≧ first 2 predetermined value ".

With this setting, "diameter wheel judgment"
Is less likely to be judged because the judgment reference time is longer than that for the "different diameter wheel judgment cancellation", and conversely, "different diameter wheel judgment cancellation" is likely to be judged for the shorter judgment reference time, As a result, an erroneous determination factor of a property that suddenly occurs and converges in a short time is excluded as much as possible from the determination of the different diameter ring,
This makes it possible to realize highly reliable determination of different diameter wheels without erroneous determination.

Second Embodiment FIG. 4 shows a flow chart of different diameter wheel determination control as a preferred embodiment of the invention described in claims 1 to 6. Also in this embodiment, similar to the first embodiment, the different diameter wheel determination and the different diameter wheel determination cancellation are performed based on the modified tire mounting determination counter and the four-wheel normality determination counter. Further, the determination reference value is changed according to the degree of bad road on the traveling road surface to realize more reliable different diameter wheel determination. Less than,
This will be described according to the flowchart.

After the control is started, the wheel speeds of the respective wheels are calculated in step B1, and it is determined in step B2 whether or not the vehicle is in steady running. Further, in step B3, only one wheel rotates faster than the other wheels. Determine if you are doing.

If YES is determined, the four-wheel normality determination counter is reset in step B4 and the odd tire mounting determination counter is incremented. Then, in step B5, it is determined whether the vehicle is currently traveling on a rough road. This judgment of running on rough roads is more likely to cause a wrong judgment such as spin of driving wheels during running on rough roads than when driving on non-bad roads. This is because the different diameter ring determination with higher reliability can be realized by differentiating the values.

First, when it is determined in step B5 that the vehicle is not traveling on a rough road, it is determined in step B6 whether or not the count value of the modified tire mounting determination counter is equal to or more than the first predetermined value, and the first predetermined value or more is exceeded. If it is, the irregular tire mounting determination is established (step B7), and if it is not more than the first predetermined value, the control is ended as it is. Also,
If it is determined in step B5 that the vehicle is traveling on a rough road, it is determined in step B8 whether or not the count value of the variant tire mounting determination counter is equal to or greater than a third predetermined value. If it is determined that the tire mounting determination is satisfied (step B9), and if the value is equal to or less than the third predetermined value, the control ends as it is. Here, by setting the magnitude relationship between the first predetermined value and the third predetermined value as “first predetermined value ≧ third predetermined value”, when the vehicle is running on a rough road, Also, it is difficult to determine the different diameter wheels.

On the other hand, in step B3, N
If it is determined to be O, the four-wheel normality determination counter is incremented and the odd-shaped tire mounting determination counter is reset in step B10. Then, in step B11, it is determined whether the vehicle is currently traveling on a rough road. Here, when it is determined that the vehicle is not traveling on a rough road, it is determined in step B12 whether the count value of the four-wheel normality determination counter is equal to or greater than the second predetermined value. Assuming that there is no different diameter wheel, the irregular tire mounting determination is reset (step B13), and if it is equal to or less than the second predetermined value, the control is terminated as it is. If it is determined in step B11 that the vehicle is traveling on a rough road, it is determined in step B14 whether or not the count value of the four-wheel normality determination counter is equal to or greater than a fourth predetermined value.
If it is greater than or equal to the fourth predetermined value, the irregular tire mounting determination is reset (step B15), and if it is less than or equal to the fourth predetermined value, the control is terminated. Here, by setting the magnitude relationship between the second predetermined value and the fourth predetermined value as “second predetermined value ≧ fourth predetermined value”, when the vehicle is traveling on a bad road, it is better than when the vehicle is traveling on a non-bad road. Also, it is easy to cancel the determination of different diameter wheels.

By the way, between the first predetermined value and the second predetermined value,
Further, between the third predetermined value and the fourth predetermined value, the magnitude relationship is set to “first predetermined value ≧ second predetermined value” and “third predetermined value ≧ fourth predetermined value”. Therefore, as described above, when the vehicle is traveling on a bad road, it is more difficult to determine the different diameter wheel and easier to cancel the determination of the different diameter wheel than when traveling on a bad road. Alternatively, the different-diameter wheel determination is hard to be made and the different-diameter wheel determination is easily canceled even when the vehicle is traveling on a bad road. Due to the difference in determination easiness between the different diameter ring determination and the different diameter ring determination cancellation, erroneous determination of the different diameter ring determination is prevented as much as possible, and a more reliable different diameter ring determination is secured. It is a thing.

The first predetermined value and the third predetermined value in this embodiment both correspond to the "first determination reference time" in the claims and the second predetermined value and the fourth predetermined value. Both correspond to the “second determination reference time” in the claims.

Third Embodiment FIG. 5 shows a flowchart of the different diameter wheel determination control as a preferred embodiment of the invention described in claims 7 and 8. Unlike the first and second embodiments described above, this embodiment is provided with only a modified tire mounting determination counter, and the modified tire mounting determination counter counts a value when the wheel speed difference is equal to or greater than a predetermined value. Increment to
When the difference is equal to or less than a predetermined value, the value is decremented and the final count value within a predetermined period is compared with the determination reference value to perform the different diameter ring determination or the different diameter ring determination cancellation. Moreover, in that case, the degree of bad road surface is also taken into consideration. This will be described below with reference to the flowchart.

After the control is started, the calculation of the wheel speed, the judgment of the steady running and the judgment of the wheel speed difference are performed in the same manner as in the above embodiments (steps C1 to C3).

If it is determined in step C3 that the wheel speed difference is equal to or greater than the predetermined value, the variant tire mounting determination counter is incremented in step C4, and if it is determined that the difference is less than the predetermined value, the variant tire mounting determination counter is determined in step C5. Decrement the tire mounting determination counter.

Thereafter, in step C6, the road is judged to be a bad road, and if it is judged that the vehicle is running on a bad road, it is first judged in step C7 whether the count value is equal to or more than the first predetermined value. If it is greater than or equal to the first predetermined value, it is determined that the irregular tire mounting determination is established (step 10).
If the count value is less than or equal to the predetermined value, it is further determined in step C8 whether the count value is less than or equal to the second predetermined value. If the count value is less than or equal to the second predetermined value, the variant tire mounting determination is reset (step C9). If it is equal to or more than the second predetermined value, the control is ended as it is.

On the other hand, if it is determined in step C6 that the vehicle is traveling on a rough road, it is first determined in step C11 whether or not the count value is equal to or greater than the third predetermined value. Shows that the irregular tire mounting determination is satisfied (step 14), but if it is the third predetermined value or less, it is further determined in step C12 whether the count value is the fourth predetermined value or less, and the fourth predetermined value or less. If it is, the irregular tire mounting determination is reset (step C1
3) If the value is greater than or equal to the fourth predetermined value, the control ends as it is.

Here, the magnitude relation between the first predetermined value to the fourth predetermined value is expressed as “first predetermined value ≧ second predetermined value”, “third predetermined value”.
“Predetermined value ≧ fourth predetermined value”, “first predetermined value ≦ third predetermined value”,
“Second predetermined value ≧ fourth predetermined value” is set. Therefore,
While traveling on a rough road, it is more difficult to determine the different-diameter wheel than when traveling on a non-bad road, but it is easier to cancel the different-diameter wheel determination.
Further, the different-diameter wheel determination is difficult to be made and the different-diameter wheel determination is easily canceled even when the vehicle is traveling on the same bad road or on a non-bad road. As a result, as in the case of each of the above-described embodiments, erroneous determination of the different diameter ring is prevented as much as possible, and highly reliable determination of the different diameter ring is ensured.

In this embodiment, the first predetermined value and the third predetermined value correspond to the "first determination reference count value" in the claims, and the second predetermined value and the fourth predetermined value. And correspond to the “second determination reference count value” in the claims.

Fourth Embodiment FIG. 6 shows a flow chart of different diameter wheel determination control as a preferred embodiment of the invention described in claim 9. Similar to the third embodiment, this embodiment is different from the third embodiment in that it performs the different diameter wheel determination or the different diameter wheel determination release only with the modified tire mounting determination counter. The point is that in the third embodiment, the value of the count value serving as the determination reference is different between the determination of the different diameter ring and the release of the determination of the different diameter ring, but in the present embodiment as well. Set the same absolute value of the count value as the judgment reference, use the positive judgment reference count value for different diameter wheel judgment, use the negative judgment reference count value for different diameter wheel judgment cancellation, and The same effect as in the case of the third embodiment is obtained by setting the increment value of the mounting determination counter once to (+1) and setting the decrement value of one time to (-2) so as to have a difference in the change rate of the count value. What you did A. It should be noted that the increment value and the decrement value for each time correspond to the "unit amount" in the claims.

This will be described below with reference to a flowchart. After the control is started, the wheel speed calculation (step D1), the steady running judgment (step D2) and the wheel speed difference judgment (step D3) are performed.

If it is determined in step D3 that the wheel speed difference is equal to or greater than the predetermined value, the variant tire mounting determination counter is incremented by (+1) in step D4, and it is determined that the wheel speed difference is equal to or less than the predetermined value. If so, in step D7, the modified tire mounting determination counter is decremented by (-2).

Thereafter, in step D5, it is determined whether or not the count value of the variant tire attachment determination counter is equal to or greater than a first predetermined value (positive value). If the count value is equal to or greater than the first predetermined value, the irregular tire attachment determination is established. (Step D9)
If it is less than or equal to the first predetermined value, it is further determined in step D6 whether or not the count value is less than or equal to the first predetermined value (negative value), and if it is less than or equal to the first predetermined value, the irregular tire mounting determination is reset. (Step D8), and if it is equal to or larger than the first predetermined value, the control is ended as it is. The initial value of the irregular tire mounting determination counter is 0.

By this control, even if the absolute value of the first initial value is set to the same value, the increase rate of the count value in the different diameter ring determination to the positive side is the same as the count value in the different diameter ring determination cancellation. Since it is smaller than the rate of decrease to the negative side,
Different-diameter ring determination is difficult, and different-diameter ring determination is easily canceled. As a result, erroneous determination of the different-diameter ring is prevented as much as possible, and reliability of the different-diameter ring is reduced. A high determination of different diameter wheels is guaranteed.

Fifth Embodiment FIG. 7 shows a flowchart of the different diameter wheel determination control as a preferred embodiment of the invention described in claim 10.
In this embodiment, the control in the fourth embodiment is further provided with a difficulty level between the determination of the different diameter wheel and the cancellation of the different diameter wheel determination depending on the degree of rough road. This will be described below with reference to the flowchart.

After the control is started, the wheel speed is calculated (step E
1), determination of steady running (step E2) and determination of wheel speed difference (step E3).

When it is determined in step E3 that the wheel speed difference is equal to or larger than the predetermined value, the odd tire mounting determination counter is incremented by (+1) in step E4, and it is determined that the wheel speed difference is equal to or smaller than the predetermined value. If so, the modified tire mounting determination counter is decremented by (-2) in step E5.

Thereafter, in step E6, it is determined whether or not the vehicle is traveling on a rough road. Here, when the vehicle is not traveling on a rough road, the process proceeds to step E7, and it is determined whether or not the count value of the variant tire mounting determination counter is equal to or more than a first predetermined value (positive value), and it is equal to or more than the first predetermined value. In this case, it is determined that the irregular tire mounting determination is satisfied (step E10). However, if it is the first predetermined value or less, it is further determined in step E8 whether the count value is the first predetermined value (negative value) or less, First
If it is less than or equal to the predetermined value, the irregular tire mounting determination is reset (step E9), and if it is greater than or equal to the first predetermined value, the control is directly terminated.

On the other hand, when it is determined in step E6 that the vehicle is traveling on a rough road, the process proceeds to step E11, and it is determined whether or not the count value of the modified tire mounting determination counter is equal to or greater than a second predetermined value (positive value). If it is equal to or larger than the second predetermined value, it is determined that the modified tire is mounted (step E14).
However, if the count value is less than or equal to the second predetermined value, it is further determined in step E12 whether the count value is less than or equal to the second predetermined value (negative value). The mounting judgment is reset (step E1
3) If the value is equal to or larger than the first predetermined value, the control ends as it is.

Here, the magnitude relation between the first initial value and the second initial value is set as "| first initial value | ≤ | second initial value |". With this setting, the different-diameter wheel determination is less likely to be made and the different-diameter wheel determination is more easily released during traveling on a rough road than when traveling on a non-bad road. Therefore, as a synergistic effect with the difference between the increment value and the decrement value of the variant tire mounting determination counter to make it difficult to determine the different diameter ring and to easily release the different diameter ring determination, the reliability is further improved. It is possible to ensure high-diameter wheel evaluation.

Sixth Embodiment FIG. 8 shows a flowchart of the different diameter wheel determination control as a preferred embodiment of the invention described in claim 11.
Different from each of the above-mentioned embodiments, the one of this embodiment is provided with a modified tire mounting determination counter for each wheel,
Different-diameter wheel determination or different-diameter wheel determination cancellation is performed, and at the time of different-diameter wheel determination, it is possible to specify which wheel is the different-diameter wheel. This will be described below with reference to the flowchart.

After the control is started, the wheel speed is calculated (step F
1), determination of steady running (step F2) and determination of wheel speed difference (step F3).

If it is determined in step F3 that the wheel speed difference is equal to or greater than the predetermined value, the variant tire mounting determination counter corresponding to the wheel that is rotating fastest (that is, the fastest wheel) is set in step F4 ( In addition to incrementing by +1), in step F5, each modified tire mounting determination counter corresponding to each of the other wheels is decremented by (-2). On the other hand, when it is determined in step F3 that the wheel speed difference is less than or equal to the predetermined value, the modified tire attachment determination counters corresponding to all the wheels are decremented by (-2) in step F8.

Thereafter, in step F6, it is determined whether or not the count value of the variant tire mounting determination counter corresponding to any one of all wheels is equal to or greater than a first predetermined value (positive value), and the first If it is equal to or more than the predetermined value, the irregular tire mounting determination is established (step F10). If it is equal to or less than the first predetermined value, whether the count value is less than or equal to the first predetermined value (negative value) in step F7. If it is below the first predetermined value, the irregular tire mounting determination is reset (step F9), and if it is above the first predetermined value, the control is terminated as it is.

By this control, even if the absolute value of the first initial value is set to the same value, the increase rate of the count value in the different diameter ring determination to the positive side is the same as the count value in the different diameter ring determination cancellation. Since it is smaller than the negative side,
Different-diameter ring determination is difficult, and different-diameter ring determination is easily canceled. As a result, erroneous determination of the different-diameter ring is prevented as much as possible, and reliability of the different-diameter ring is reduced. A high determination of different diameter wheels is guaranteed. Further, since the odd-shaped tire mounting determination counters are provided corresponding to the respective wheels, it is possible to specify which of all the wheels it is when the different-diameter wheel determination is performed. It is a thing.

Seventh Embodiment FIG. 9 shows a flowchart of the different diameter wheel determination control as a preferred embodiment of the invention of claim 12.
In this embodiment, the control in the sixth embodiment is further provided with a difficulty difference between the determination of the different-diameter wheel and the cancellation of the different-diameter wheel determination depending on the degree of rough road. This will be described below with reference to the flowchart.

After the control is started, the wheel speed is calculated (step G
1), determination of steady running (step G2) and determination of wheel speed difference (step G3).

If it is determined in step G3 that the wheel speed difference is equal to or greater than the predetermined value, the variant tire mounting determination counter corresponding to the fastest wheel is set to (+) in step G4.
In addition to incrementing 1), in step G5, each modified tire mounting determination counter corresponding to each of the other wheels is decremented by (-2). On the other hand, if it is determined in step G3 that the wheel speed difference is less than or equal to the predetermined value, step G1
In step 1, the modified tire mounting determination counters corresponding to all the wheels are decremented by (-2).

Thereafter, in step G6, it is determined whether or not the vehicle is traveling on a rough road, and if it is determined that the vehicle is not traveling on a rough road, then at step G7, any one of all wheels is handled. It is determined whether or not the count value of the variant tire attachment determination counter is equal to or greater than a first predetermined value (positive value), and if the count value is equal to or greater than the first predetermined value, the variant tire attachment determination is established (step G10). If it is less than or equal to the predetermined value, it is further determined in step G8 whether or not the count value is less than or equal to the first predetermined value (negative value), and if it is less than or equal to the first predetermined value, the variant tire mounting determination is reset ( Step G9), and if it is equal to or more than the first predetermined value, the control is ended as it is.

On the other hand, when it is determined in step G6 that the vehicle is traveling on a rough road, the count value of the variant tire mounting determination counter corresponding to any one of all the wheels is determined to be the second predetermined value in step G12. It is determined whether or not (a positive value) or more. If it is equal to or more than the second predetermined value, it is determined that the irregular tire mounting determination is satisfied (step G15), but if it is equal to or less than the second predetermined value, further counting is performed in step G13 It is determined whether the value is less than or equal to the second predetermined value (negative value). If the value is less than or equal to the second predetermined value, the variant tire mounting determination is reset (step G14), and if the value is greater than or equal to the first predetermined value. Ends control as it is.

Here, the magnitude relation between the first initial value and the second initial value is set to "| first initial value | ≤ | second initial value |". With this setting, the different-diameter wheel determination is less likely to be made and the different-diameter wheel determination is more easily released during traveling on a rough road than when traveling on a non-bad road. Therefore, as a synergistic effect with the difference between the increment value and the decrement value of the variant tire mounting determination counter to make it difficult to determine the different diameter ring and to easily release the different diameter ring determination, the reliability is further improved. It is possible to ensure high-diameter wheel evaluation.

Since the odd-shaped tire mounting determination counters are provided corresponding to the respective wheels, when the different-diameter wheel determination is made, which of all the wheels is specified. What can be done is the same as in the case of the sixth embodiment.

[Brief description of drawings]

FIG. 1 is an overall system diagram of an example in which a different diameter wheel determination device of the present invention is incorporated into an ABS control of a vehicle.

FIG. 2 is a flowchart showing the overall flow of ABS control.

FIG. 3 is a control flowchart in the first embodiment of the different diameter wheel determination device of the present invention.

FIG. 4 is a control flowchart in a second embodiment of the different diameter wheel determination device of the present invention.

FIG. 5 is a control flowchart in a third embodiment of the different diameter wheel determination device of the present invention.

FIG. 6 is a control flowchart in a fourth embodiment of the different diameter wheel determination device of the present invention.

FIG. 7 is a control flowchart in a fifth embodiment of the different diameter wheel determination device of the present invention.

FIG. 8 is a control flowchart in the sixth embodiment of the different diameter wheel determination device of the present invention.

FIG. 9 is a control flowchart in a seventh embodiment of the different diameter wheel determination device of the present invention.

[Explanation of symbols]

1 is a brake pedal, 2 is a master cylinder, 3 is a hydraulic unit, 4 is a control unit, 5 is a deformed tire mounting determination counter, 6 is a four-wheel normality determination counter, 7 is a bad road sensor, 8 is storage means, and 9 is a brake. A sensor, 11 is a wheel cylinder, 12 is a brake disc, 13 is a wheel speed sensor, and 14 to 17 are brake pipes.

Claims (12)

[Claims] 1. A wheel speed sensor provided on each wheel of a vehicle for detecting the wheel speed of each wheel, and a wheel speed comparing means for comparing the wheel speed detection values detected by the wheel speed sensors. A first detecting means for detecting a duration of a state in which a difference between the wheel speed detection value of one wheel and a wheel speed detection value of another wheel is a predetermined value or more; and a duration time of a state in which the difference is a predetermined value or less. Second to detect
A different diameter ring determination is performed when the detection duration of the first detection means reaches the first determination reference time, and the detection duration of the second detection means reaches the second determination reference time. A different-diameter wheel determination device for a vehicle, wherein the different-diameter wheel determination is canceled at times, and the second determination reference time is set shorter than the first determination reference time. 2. The detection duration in each of the first detection means and the second detection means according to claim 1, is a continuation duration when a state in which the difference is a predetermined value or more or a state in which the difference is a predetermined value or less is continuous. A vehicle different diameter wheel determination device characterized by the above. 3. The detection duration of each of the first detection means and the second detection means according to claim 1, wherein both the difference is a predetermined value or more or a predetermined value or less is intermittently continued within a predetermined period. The different-diameter wheel determination device for a vehicle, which is the cumulative time within the predetermined period in the case of performing. 4. The vehicle according to claim 1, further comprising a bad road condition detecting means for detecting a bad road condition of the road surface, and the first determination reference time is set to be longer when traveling on a rough road than when traveling on a bad road. A different diameter wheel determination device for a vehicle. 5. The vehicle according to claim 1, further comprising a bad road condition detecting means for detecting a bad road condition of the road surface, and the second determination reference time is set shorter when traveling on a rough road than when traveling on a non-bad road. A different diameter wheel determination device for a vehicle. 6. The vehicle according to claim 1, further comprising: a bad road condition detecting means for detecting a bad road condition of the road surface, wherein the first determination reference time is set longer during traveling on a bad road than during traveling on a non-bad road. A different-diameter wheel determination device for a vehicle, wherein the second determination reference time is set to be shorter than that when traveling on a rough road. 7. A wheel speed sensor provided on each wheel of the vehicle for detecting the wheel speed of each wheel, and a wheel speed comparison means for comparing the wheel speed detection values detected by each wheel speed sensor. A first counting mode in which either one of an operation of increasing or decreasing a count value by a unit amount is performed when a difference between a detected wheel speed value of one wheel and a detected wheel speed value of another wheel is a predetermined value or more. And a second counting mode for performing one of the other operations of increasing or decreasing the count value by a unit amount when the count value is less than or equal to a predetermined value. When the cumulative count value in the 1-count mode is equal to or greater than the first determination reference count value, the different diameter wheel determination is performed, and the cumulative count value in the second count mode is the second determination reference cow. When the value is equal to or larger than the threshold value, the different diameter wheel determination is canceled, and the second determination reference count value is set to be smaller than the first determination reference count value. Wheel judgment device. 8. The bad road condition detecting means for detecting a bad road condition of a road surface according to claim 7, wherein the first determination reference count value is set to a value larger when traveling on a bad road than when traveling on a bad road. Then, the different diameter wheel determination device for a vehicle, wherein the second determination reference count value is set to a value smaller when traveling on a bad road than when traveling on a bad road. 9. A wheel speed sensor provided on each wheel of the vehicle for detecting the wheel speed of each wheel, and a wheel speed comparison means for comparing the wheel speed detection values detected by each wheel speed sensor. When the difference between the detected wheel speed value of one wheel and the detected wheel speed value of the other wheel is equal to or greater than a predetermined value, either one of the operation of increasing or decreasing the count value by a unit amount is performed.
And a count means for selecting and executing a count mode and a second count mode for performing either the other operation of increasing or decreasing the count value by a unit amount when the count value is less than or equal to a predetermined value. When the cumulative count value in the first count mode is greater than or equal to the first determination reference count value, the different diameter wheel determination is performed, and when the cumulative count value in the second count mode is greater than or equal to the second determination reference count value, the different ring determination is performed. A different-diameter wheel determination device for a vehicle, which is configured to cancel the radial wheel determination and set the unit amount in the first counting mode to be smaller than the unit amount in the second counting mode. 10. The method according to claim 9, further comprising: a bad road condition detecting means for detecting a bad road condition of a road surface, wherein the first determination reference count value is set to be larger when traveling on a bad road than when traveling on a bad road. A different diameter wheel determination device for a vehicle, wherein the second determination reference count value is set to be smaller when traveling on a bad road than when traveling on a bad road. 11. A wheel speed sensor provided on each wheel of the vehicle for detecting the wheel speed of each wheel, and a wheel speed comparison means for comparing the wheel speed detection values detected by each wheel speed sensor. , A plurality of counting means respectively provided for the respective wheels, and when the difference between the wheel speed detection value of one wheel and the wheel speed detection value of the other wheel is more than a predetermined value, the one wheel For the above-mentioned count means, either one of the operations for increasing or decreasing the count value by the unit amount is performed in the corresponding count means, and for the other wheels, the above-mentioned count value is used as the unit amount in each count means corresponding to each wheel. While the other one of the operations for increasing or decreasing one by one is performed, the cumulative count value of any one of the plurality of counting means is the third determination reference cow. When the accumulated count value of the plurality of counting means is less than or equal to the fourth determination reference count value, the different diameter wheel determination is canceled when the count value is equal to or more than the predetermined value. A different diameter wheel determination device for a vehicle, wherein the unit amount in one operation of each of the counting means is set to a value smaller than the unit amount in the other operation. 12. The vehicle according to claim 11, further comprising a bad road condition detecting means for detecting a bad road condition of a road surface, wherein the third determination reference count value is set to be larger when traveling on a bad road than when traveling on a bad road. A different-diameter wheel determination device for a vehicle, wherein the fourth determination reference count value is set to be smaller when traveling on a bad road than when traveling on a bad road.