JP2002002240A - Monitoring device for driving of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device warning the user of a driving condition turning worsen. SOLUTION: Control part 8 calculates a travelling factor that is a travelling distance of the vehicle while the wheel's only one revolution using data of the revolving speed of wheel 1 and the speed of the vehicle which were detected by the revolving speed detecting part 2 and GPS receiver 3 regularly while driving, then it additionally stores an error data from the specified standard driving factor in a memory 5. When the latest n pieces of the error data stored within the memory 5 are to be compared with the specified threshold value, and when all of them would be overthreshold value, it should judge to be happened a depression or wearing of tire 1A which come to show an warning messages as 'worsen of driving condition' and 'emergency of tire depression or wearing' an a display part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for monitoring the running state of a vehicle, and more particularly to a method for monitoring tire pressure reduction or wear.
The present invention relates to a vehicle running state monitoring device that can warn a user that deterioration of a running state such as a tire idling or a slip has occurred.

[0002]

2. Description of the Related Art In a vehicle, the temperature of an engine is detected by a temperature sensor. If the temperature of the engine rises above a certain level, a warning of overheating is issued. However, a warning system is provided to give a warning when the fuel pressure becomes lower than a certain level, and to prevent the inability to operate due to a fuel shortage.

[0003]

However, when the air pressure of the tires is low or the tires are worn, it is dangerous that the running loss is large and the steering wheel is difficult to operate. Also, when the tire runs idle or slips on a rough road, the running loss is large and dangerous. However, the conventional vehicle warning system cannot warn of deterioration of a running state such as a decrease in tire air pressure or tire wear, occurrence of tire idling or slippage. The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide a vehicle running state monitoring device that can warn a user of deterioration of a running state.

[0004]

According to a first aspect of the present invention, there is provided a vehicle traveling state monitoring apparatus comprising: a rotational speed measuring means for measuring a rotational speed of a wheel of a vehicle; and a vehicle speed measuring means for measuring a speed of the vehicle. While running, using the rotation speed measurement means and the rotation speed vehicle speed measured by the vehicle speed measurement means, calculating means for calculating a running coefficient which is a moving distance of the vehicle while the wheels rotate by a predetermined reference rotation amount, Monitoring means for monitoring a change in a running coefficient during running, and determining that the running state has deteriorated when a difference from a predetermined reference value exceeds a predetermined fixed value; and determining that the running state has deteriorated by the monitoring means. Then, there is provided a warning means for outputting a warning of the deterioration of the running state to the user. In a vehicle, the tires are deflated with the passage of time, and the air pressure gradually decreases and gradually wears. When the air pressure is released or worn, the running coefficient, which is the moving distance of the vehicle while the wheels rotate by a predetermined reference rotation amount, gradually decreases. You can also drive on rough roads,
If the tires run idle or slip due to bad road conditions, the running coefficient temporarily decreases. According to the first aspect, when the difference between the running coefficient regularly obtained from the predetermined reference value exceeds a predetermined fixed value during running, a warning is issued, so that the user can reduce tire pressure or wear, It can be seen that the running condition is deteriorating due to idling or slipping of the tires, and the driver can drive more carefully than usual to drive safely. The reference value in claim 1 is a moving distance of the vehicle during which the wheels in good tire condition (pneumatic condition or pneumatic condition and abrasion condition) rotate by the predetermined reference amount without idling and slipping. good. According to a third aspect of the present invention, in the device according to the first aspect, an operation means for performing a reference value automatic setting instruction operation;
When the reference value automatic setting instruction operation is performed by the operation means, the wheel is rotated by the predetermined reference rotation amount using the rotation speed and the vehicle speed measured by the rotation speed measurement means and the vehicle speed measurement means at that time. And a reference value setting means for calculating a moving distance of the vehicle and setting the calculated value as a reference value. According to the third aspect, when the reference value automatic setting instruction operation is performed while the vehicle is traveling on a good road with new tires, wheels having a good tire condition (air pressure condition and abrasion condition) as a reference value are free from idling and slippage. The moving distance of the vehicle during the rotation by the predetermined reference rotation amount can be automatically set as the reference value, and the trouble of setting the reference value by manual operation can be omitted. According to a fourth aspect of the present invention, there is provided a vehicle running state monitoring apparatus for measuring a rotation speed of a wheel of a vehicle, a vehicle speed measurement unit for measuring a speed of the vehicle, a rotation speed measurement unit, and a vehicle speed measurement unit. Using the rotational speed and the vehicle speed measured in the above, calculating means for calculating a running coefficient which is a moving distance of the vehicle while the wheels rotate by a predetermined reference rotation amount, and monitoring the change of the running coefficient during running. Monitoring means for determining that a decrease in tire air pressure or tire wear has occurred when a state in which a difference from a predetermined reference value exceeds a predetermined constant value continues for a predetermined fixed time; Or warning means for outputting a warning to the user that the tire pressure has decreased or the tire has worn when it is determined that the tire has worn. According to the present invention, when a state in which the difference between the running coefficient and the predetermined reference value exceeds the predetermined fixed value during the running continues for a predetermined fixed time, a warning of a decrease in tire air pressure or occurrence of wear is issued. Therefore, the user can drive more safely than usual and drive safely, and also can maintain and replace the tires to ensure safety. According to a fifth aspect of the present invention, there is provided a vehicle running state monitoring device, comprising: a rotation speed measurement unit for measuring a rotation speed of a vehicle wheel; a vehicle speed measurement unit for measuring a vehicle speed; a rotation speed measurement unit; Using the rotational speed and the vehicle speed measured in the above, calculating means for calculating a running coefficient which is a moving distance of the vehicle while the wheels rotate by a predetermined reference rotation amount, and monitoring the change of the running coefficient during running. A monitoring means for determining that a tire idle or slip has occurred when a state in which a difference from a predetermined reference value exceeds a predetermined constant value temporarily occurs, and a tire idle or slip occurs in the monitoring means. And a warning means for outputting a warning to the user that the tire has slipped or slipped. According to the fifth aspect, when a state in which the difference between the running coefficient and the predetermined reference value exceeds a predetermined fixed value temporarily occurs during running, a warning of occurrence of idling or slipping of the tire is issued, so that the user Can drive safely with more careful driving than usual. According to a sixth aspect of the present invention, there is provided a vehicle running state monitoring device, comprising: a rotation speed measurement unit for measuring a rotation speed of a wheel of the vehicle; a vehicle speed measurement unit for measuring a speed of the vehicle; And a storage means for storing a reference travel coefficient which is a moving distance of the vehicle while rotating by a predetermined reference rotation amount without slipping, and calculating from the rotation speed and the reference travel coefficient measured by the rotation speed measurement means during traveling. Vehicle speed and
The monitoring means monitors the change in the error rate from the vehicle speed measured by the vehicle speed measuring means, and determines that the running state has deteriorated when the vehicle speed exceeds a predetermined constant value.If the monitoring means determines that the running state has deteriorated, And a warning unit for outputting a warning of the deterioration of the running state to the user. In a vehicle, the tires are deflated with the passage of time, and the air pressure gradually decreases and gradually wears. When the air pressure is released or worn, the moving distance of the vehicle while the wheels rotate by a predetermined reference rotation amount gradually decreases. Also, when the tire runs idle or slips due to bad road conditions or bad road conditions, the travel distance of the vehicle while the wheels rotate by the predetermined reference rotation amount is temporarily reduced. According to claim 6, during traveling, the error rate between the vehicle speed calculated from the rotation speed measured by the rotation speed measurement means and the reference traveling coefficient and the vehicle speed measured by the vehicle speed measurement means exceeds a predetermined constant value. Then, the user is warned that the running condition is deteriorating due to a decrease or wear of the air pressure of the tire, a running or slipping of the tire, and the user can drive more carefully and drive safely.
According to claim 7 of the present invention, the operation means for performing the reference travel coefficient automatic setting instruction operation, and when the reference travel coefficient automatic setting instruction operation is performed by the operation means, the rotation speed measurement means and the vehicle speed measurement means measure at that time. Calculating a travel distance of the vehicle while the wheel rotates by the predetermined reference rotation amount using the rotation speed and the vehicle speed, and storing the reference travel coefficient in a storage unit as a reference travel coefficient. It is characterized by. According to the seventh aspect, when the reference traveling coefficient setting instruction operation is performed while traveling on a good road with new tires, the wheels in the good tire state (pneumatic state and abrasion state) are free from the predetermined rotation without slipping and slipping. The moving distance of the vehicle during the rotation by the reference rotation amount can be automatically set as the reference running coefficient, so that it is not necessary to manually set the numerical value of the reference running coefficient. In the vehicle running state monitoring apparatus according to the eighth aspect of the present invention, a rotational speed measuring means for measuring a rotational speed of a wheel of the vehicle, a vehicle speed measuring means for measuring a speed of the vehicle, and a wheel in good tire condition spinning idle A storage means for storing a reference running coefficient which is a moving distance of the vehicle while rotating by a predetermined reference rotation amount without slipping, and calculating from a rotation speed and a reference running coefficient measured by a rotation speed measuring means during running. The change in the error rate between the vehicle speed and the vehicle speed measured by the vehicle speed measurement means is monitored, and when a state exceeding a predetermined value continues for a predetermined time, tire deflation or tire wear occurs. If the monitoring means determines and the monitoring means determines that a tire deflation or a tire wear has occurred, a warning output to the user indicating that a tire deflation or a tire wear has occurred is output. And warning means,
It is characterized by having. According to claim 8, during traveling, the error rate between the vehicle speed calculated from the rotation speed measured by the rotation speed measurement means and the reference traveling coefficient and the vehicle speed measured by the vehicle speed measurement means exceeds a predetermined constant value. If the tire is kept in the state for a predetermined period of time, a warning is issued that the tire pressure is low or the tire is worn, so that the user can drive more carefully than usual and drive safely, and also maintain and replace the tires. Can also ensure safety. In the vehicle traveling state monitoring device according to the ninth aspect of the present invention, a rotational speed measuring means for measuring a rotational speed of a wheel of the vehicle, a vehicle speed measuring means for measuring a speed of the vehicle, and a wheel in good tire condition spinning idle And a storage means for storing a reference running coefficient which is a moving distance of the vehicle while rotating by a predetermined reference rotation amount without slipping, and a running speed calculated by a running speed and running speed measured by a running speed measuring means during running. Monitoring means for monitoring the error rate between the vehicle speed and the vehicle speed measured by the vehicle speed measuring means, and determining that a tire idling or slip has occurred when a state exceeding a predetermined constant value temporarily occurs,
When the monitoring means determines that a tire idling or slippage has occurred, a warning means for outputting a warning to the user that a tire idling or slippage has occurred is provided. According to claim 9, during traveling,
When the error rate between the vehicle speed calculated from the rotation speed measured by the rotation speed measuring means and the reference traveling coefficient and the vehicle speed measured by the vehicle speed measuring means temporarily exceeds a predetermined constant value, the tire is stopped. Since the warning of the idling or the occurrence of the slip is issued, the user can drive more carefully and drive safely.

[0005]

Next, one embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a vehicle running state monitoring device according to the present invention. Reference numeral 1 denotes a wheel mounted on the vehicle, and a tire 1A is mounted on an outer peripheral portion. Reference numeral 10 denotes a traveling state monitoring device, which deteriorates the traveling state due to a decrease in the air pressure of the tire 1A or wear of the outer surface of the tire 1A, or causes the tire 1A to run idle or slip when traveling on a road with poor road surface conditions, and the traveling state is monitored When it gets worse, a warning is issued to the driver to encourage more careful driving than usual and to drive safely. Among the running state monitoring devices 10, 2 is a rotation speed detecting unit that detects the rotation speed of the wheels 1 and outputs rotation speed data, 3 is a vehicle speed (hereinafter referred to as vehicle speed) detected by satellite navigation, It is a GPS receiver that outputs data. Here, the rotation speed detection unit 2
0 means that the rotation speed data is output at a certain fixed cycle in the range of 1 second to several tens of seconds, and the GPS receiver 3 outputs the vehicle speed data at a cycle of 1 second. Reference numeral 4 denotes a display unit that displays a warning message indicating that the running state has deteriorated when the running state has deteriorated. Specifically, when the air pressure of the tire 1A has decreased or the outer surface of the tire 1A has worn, The warning message of "deterioration in running condition" and "tire pressure drop or tire wear" is displayed, and when the tire 1A idles or slips, the warning message of "deterioration in running condition" and "tire idling or slip occurrence" is displayed. indicate.

Reference numeral 5 denotes a memory, a first storage area 5A capable of storing one reference running coefficient data, and N (where N is, for example, 1).
And a second storage area 5B capable of storing (an integer of 0 or more) pieces of error data (see FIG. 2). The reference running coefficient is defined as a period during which the wheel 1 in the good air pressure state (or the air pressure state and the wear state) of the tire 1A rotates by a predetermined reference rotation amount (here, one rotation as an example) without slipping and slipping. Is the moving distance of the vehicle. While the vehicle is running, the wheel 1 is periodically rotated by the predetermined reference rotation amount (one rotation) using the rotation speed detected by the rotation speed detection unit 2 and the vehicle speed detected by the GPS receiver 3. The running coefficient, which is the moving distance of the vehicle, is calculated, and an error from the reference running coefficient is calculated and additionally stored in the second storage area 5B.

Reference numeral 6 denotes an operation unit for instructing the automatic setting of the reference running coefficient and for inputting the numerical value of the reference running coefficient by manual operation. Reference numeral 7 denotes a magnetic card reading unit which, when the magnetic card 20 on which the data of the reference running coefficient is magnetically recorded is inserted, reads and outputs the data of the reference running coefficient. Reference numeral 8 denotes a control unit having a microcomputer structure. When data of the reference running coefficient is input from the magnetic card reading unit 7, the control unit 8 stores the data in the first storage area 5A of the memory 5. Also, when the user manually inputs a numerical value of the reference travel coefficient at the operation unit 6, the input value is stored in the first storage area 5A of the memory 5. Unlike this, tire 1
When the user performs an operation to instruct the automatic setting of the reference traveling coefficient with the operation unit 6 immediately after re-injecting air into A or replacing the tire 1A with a new one, the control unit 8 is detected by the rotation speed detection unit 2 at that time. The input rotation speed and the vehicle speed detected by the GPS receiver 3 are input, a reference running coefficient is calculated from the rotation speed and the vehicle speed, and stored in the first storage area 5A of the memory 5.

The control unit 8 periodically controls the rotation speed detected by the rotation speed detection unit 2 and the GP.
The vehicle speed detected by the S receiver 3 is input, and a running coefficient, which is a moving distance of the vehicle while the wheel 1 rotates by the predetermined reference rotation amount (one rotation), is calculated from the rotation speed and the vehicle speed. Together with the error from the reference running coefficient value,
The data is additionally stored in the second storage area 5B of the memory 5. And
When n (where n ≦ N) or more error data is accumulated in the second storage area 5B, the latest n error data are compared with predetermined positive threshold values, respectively, and all error data are equal to or less than the threshold value. In this case, it is determined that the tire 1A has a good air pressure state (or an air pressure state and a worn state), that no running or slippage has occurred, and that the running state is good. Display.

On the other hand, the latest n error data are compared with predetermined positive threshold values, respectively, and if all of them exceed the threshold value (that is, if the threshold value is continuously exceeded, ),
It is determined that the running condition is deteriorating due to the decrease in air pressure or wear of the tire 1A, and a warning message of “deterioration of running condition” and “reduction of tire air pressure or wear” is displayed on the display unit 4, and the tire 1A is displayed to the user. To inform the driver of a decrease in air pressure or the occurrence of abrasion, to encourage careful driving and to perform safe driving, and to prompt maintenance and replacement of the tire 1A. Also, the latest n error data are compared with a predetermined positive threshold value respectively, and if only a part exceeds the threshold value (that is, temporarily exceeds the threshold value), the tire Judging that the running condition is deteriorating due to idling or slipping of 1A,
The display unit 4 displays warning messages of “deterioration of running state” and “occurrence of tire idling or slippage”, and prompts the user to cautiously drive idling or slippage of tire 1A to drive safely.

FIGS. 3 and 4 are flow charts showing a running state monitoring / warning process by the control unit 8, and FIG. 5 is a diagram for explaining a running state judging method. The operation of the embodiment will be described. In addition,
In the first storage area 5A of the memory 5, a reference running coefficient (new (the air having a specified air pressure is contained, and the air is not worn, and is excellent) is determined by the vehicle manufacturer in advance according to the combination of the type and the type of the tire 1A. moving distance) a ₀ of the vehicle when the one rotation without tire 1A good road road tire 1A of a state) idles and slip is assumed to be already stored (see FIG. 2).

The control unit 8 firstly stores the second
The storage area 5B is cleared, and i indicating the number of the error data is set to 1 (steps S10 and S11 in FIG. 3). Next, whether the automatic setting instruction operation of the reference travel coefficient has been performed on the operation unit 6 or the manual input operation of the reference travel coefficient has been performed,
Each check is performed to determine whether or not read data of the reference running coefficient is input from the magnetic card reader 7 (step S1).
2, S16, S18), if NO in all cases, the process proceeds to FIG. 4, in which the rotation speed data detected by the rotation speed detection unit 2 and the vehicle speed data detected by the GPS receiver 3 are each determined for a certain predetermined time. T (T is, for example, 2-20 seconds) to measure the rotational speed N ₁ and vehicle speeds V ₁ to by averaging between sampling and the (step S20). Then, it is checked whether V ₁ > 0 (step S21). If NO while the vehicle is stopped, error data cannot be calculated, and the process returns to step S10 in FIG.

If the vehicle is running and the answer is YES in step S21
If it becomes, V₁/ N₁Wheel 1 makes one rotation
Running coefficient a which is the moving distance of the vehicle between₁Is calculated and updated.
And a ₀-A₁Is calculated and the air with the specified air pressure is
1 wheel 1 in ideal condition with no wear
Reference running coefficient a, which is the moving distance of the vehicle during rotation₀Or
Error Δa₁Is calculated and added to the second storage area 5B.
Remember. First, the start address A of the second storage area 5B
D₁(Steps S22 and S23; see FIG. 2).
See). Subsequently, n pieces (n is 1 <n ≦) are stored in the second storage area 5B.
N is an integer that satisfies N, for example, an error of 10 to 20) or more.
It is checked whether difference data is stored (step S2).
4) Since i'm still NO here, increment i
2 (step S32), and then step S1 in FIG.
Return to 2.

Each check is made to determine whether an operation for automatically setting the reference travel coefficient has been performed on the operation unit 6, whether a manual input of the reference travel coefficient has been performed, and whether reference data of the reference travel coefficient has been input from the magnetic card reader 7. (Steps S12, S16, S18), and N
If it is O, the process proceeds to FIG. 4, where the rotation speed data detected by the rotation speed detection unit 2 and the vehicle speed data detected by the GPS receiver 3 are each sampled during T and averaged to obtain the rotation speed N _2. and measuring the vehicle speed V ₂ (step S20).
Then, V _2> 0 or checked (step S21), and if a YES again, calculate the V ₂ / N traveling coefficient a ₂ calculates the go _2, further performing the calculation of a ₀ -a ₂ The error Δa ₂ from the reference running coefficient a ₀ is calculated, and the second storage area 5
In addition to B, it is stored. .Delta.a ₂ is stored in the second address AD ₂ of the second storage area 5B (step S2
2, S23. (See FIG. 2). Hereinafter, by repeating the same processing, data indicating an error between the current running coefficient and the reference running coefficient is periodically accumulated in the second storage area 5B.

Thereafter, the start address of the second storage area 5B
AD₁From address AD_nJust n errors by
When the difference data is accumulated (i = n), YE is determined in step S24.
It becomes S. At this time, the control unit 8 stores the second storage area 5
B, the latest n error data Δa_n~ Δ
a₁Are all predetermined positive threshold values Δa_THBelow or
Check (step S25). Here, FIG.
Δa as shown_n~ Δa ₁Is Δa_THWas smaller
At this time, the control unit 8 checks the air pressure state of the tire 1A and the friction.
The wear condition is good, and idling and slippage have occurred.
It is determined that the traveling state is good (Y in step S25).
ES), causing the display section 4 to display "Good running condition".
(Step S26). Thereby, the user can use the tire 1A.
The air pressure and wear conditions of the
It can be seen that no loop has occurred. Step S26
And after incrementing i to n + 1,
It returns to step S12.

The next error data Δa_{n + 1}To the second storage area 5
(N + 1) th address AD of B _{n + 1}And remembered
Also at step S24, the answer is YES, and the latest n errors
Data Δa_{n + 1}~ Δa_TwoFor all the prescribed positive thresholds
Value Δa_THIt is checked whether it is below (step S25). This
Again, as shown in FIG._{n + 1}~ Δa_TwoAll of
Δa_THWhen it is smaller, the control unit 8
4 displays "Good running condition" (step S2).
6). Then, i is incremented to n + 2.
And return to step S12 in FIG. Hereinafter, similarly,
The control unit 8 stores the most stored data in the second storage area 5B.
New n error data Δa_i~ Δa_{i-n + 1}About all
Predetermined positive threshold value Δa_THCheck if below, YES
If this is the case, the display unit 4 displays "Good running condition".
(Step S26). In step S23, Δa_iTo
When trying to store in the second storage area 5B, the last
Address AD_NIf the error data has been stored up to
Address AD₁Return to memorize.

Thereafter, when the air from the tire 1A is evacuated and the air pressure is reduced, or when the tire 1A is worn, the moving distance (= running coefficient) of the vehicle per rotation calculated in the process of step S22 becomes smaller. , Error data increases. If the control unit 8 checks in step S25 that all of the latest n error data Δa _{i to} Δa _{i -n + 1} are equal to or less than the predetermined positive threshold value Δa _TH , then the result is NO. It is checked whether the threshold value Δa _TH has been exceeded (step S27). Here, FIG.
As shown in (2), any of Δa _{i to} Δa _{i-n + 1} is Δa
When it exceeds _TH (that is, when the error data continuously exceeds the threshold value), it is determined that the tire 1A has a reduced air pressure or the tire 1A has been worn and the running state is deteriorated ( (YES in step S27), the display unit 4 displays "deterioration of running state" and "reduction of tire air pressure or occurrence of tire wear" (step S28). After step S28, i is incremented to n + 1 (step S28).
32), and return to step S12 in FIG.

From the warning message on the display unit 4, the user can know that the tire 1A has deteriorated in the air pressure state or the wear state, and can drive more carefully than usual and try to drive safely. Maintenance and replacement of 1A can be performed to ensure safety. After the tire 1A is filled with air and the specified air pressure is obtained, or the worn tire 1A is replaced with a new one, the moving distance of the vehicle per revolution (= running coefficient) calculated in the process of step S22 is the reference running. Since the value returns to a value near the coefficient and the error data becomes smaller, the display on the display unit 4 returns to "good running condition" (YES in step S25, S26).

On the other hand, if the tire 1A runs idle on the road with bad road surface conditions, causing the tire 1A to idle or slip even when the air pressure of the tire 1A has not decreased and is not worn, it is temporarily calculated in step S22. And the large error data is stored in the second storage area 5.
B. Then, the control unit 8 determines in step S25 that the latest n error data Δa _{i to} Δa
When all per _{i-n + 1} becomes NO when checking whether a predetermined positive threshold .DELTA.a _TH or less, subsequently, checks whether all exceeds a predetermined positive threshold .DELTA.a _TH (step S
27). If the answer here is NO, it is checked whether only a part of the latest n error data Δa _{i to} Δa _{i-n + 1} exceeds a predetermined positive threshold value Δa _TH (step S2).
9). Here, as shown in FIG. 5 (3), Δa _{i to} Δa
_When a part of _{i-n + 1} exceeds Δa _TH (that is, if the error data temporarily exceeds the threshold), the tire 1
It is determined that the running state is deteriorating due to the idling or slippage of A (YES in step S29), and the display unit 4 displays “deterioration in driving state” and “tire spinning or slippage” ( Step S30). Step S
After 30, i is incremented to n + 1 (step S32), and the process returns to step S12 in FIG.

From the warning message on the display unit 4, the user knows that the tire 1A is idling or slipping, so that the user can drive more carefully than usual and try to drive safely. If the idling and slippage of the tire 1A are eliminated, the moving distance of the vehicle per revolution (= running coefficient) calculated in the process of step S22 returns to a value close to the reference running coefficient, and the error data becomes small. The display of the unit 4 returns to “good running condition” (YE in step S25).
S, S26). Steps S25 and S27 in FIG.
If NO in any of S29, the display on the display unit 4 is stopped because some malfunction has occurred (step S31).

In addition, re-injecting air into the tire 1A,
It is desirable to reset the reference running coefficient when replacing with a new one which is free from wear and contains air at a specified air pressure. For example, when the user who sees the warning of the decrease in air pressure or the occurrence of abrasion replaces the tire 1A with a new one, immediately after the vehicle is traveling on a road with a good road surface condition, the operation unit 6 performs an operation for instructing automatic setting of the reference traveling coefficient. Then, the control unit 8 determines YES in step S12 of FIG. 3, and outputs the rotation speed data detected by the rotation speed detection unit 2 and the vehicle speed data detected by the GPS receiver 3 to T ′ (T ′ is, for example, 20-60
Seconds), the rotation speed N is sampled and averaged.
Measuring the ₀ and the vehicle speed V ₀ (Step S13). And
V ₀ / N ₀ is calculated to calculate a reference running coefficient a ₀ ,
It is stored in the first storage area 5A (steps S13 to S1).
5. (See FIG. 2). Then, the process returns to step S10. As a result, the correct reference running coefficient according to the combination of the type of tire 1A and the vehicle model after replacement is automatically set, so that the user does not have to measure the reference running coefficient by himself and manually input the reference running coefficient. . Since the traveling state monitoring device was retrofitted to the vehicle, the first storage area 5 of the memory 5 was initially provided.
Even if the reference running coefficient data is not stored in A, after the running condition monitoring device is retrofitted to the vehicle, the specified air pressure is applied to the tire 1A, or the specified air pressure is applied to the tire 1A, and the tire is worn. When the vehicle is traveling on a road with a good road surface condition without any obstacles, an operation for automatically setting the reference traveling coefficient by the operation unit 6 can be performed in the same manner as described above, so that the correct reference traveling according to the combination of the type of the tire 1A and the vehicle type is performed. The coefficient can be set automatically.

Alternatively, after replacing the tire, the user may measure the reference running coefficient by himself / herself or, from a tire store or the like, teach the value of the reference running coefficient according to the combination of the type and model of the replaced tire 1A. If it is received, a manual input operation of the reference travel coefficient is performed on the operation unit 6. Then, the control unit 8 determines YES in step S16 in FIG. 3, the reference travel coefficients a ₀ input data, into the first storage area 5A (see steps S17, S15. Figure 2). When a magnetic card 20 having a reference running coefficient according to the combination of the type of the tire 1A and the vehicle model after replacement is recorded from a tire dealer, the magnetic card 20 is inserted into the magnetic card reading section 7 and the data of the reference running coefficient is stored. Read and output. When the control unit 8 receives the read data from the magnetic card reading unit 7, the reference running coefficient a ₀
Is stored in the first storage area 5A (step S1).
9, S15. (See FIG. 2).

According to this embodiment, when the difference between the regularly calculated running coefficient from the predetermined reference running coefficient exceeds a predetermined fixed value during running of the vehicle, a warning indicating deterioration of the running state is issued. Therefore, the user knows that the running condition is deteriorating due to the decrease or wear of the air pressure of the tire 1A, the idling or slipping of the tire, and the user can drive more carefully than usual to drive safely. More specifically,
During running of the vehicle, if the difference between the regularly calculated running coefficient from the predetermined reference running coefficient continuously exceeds a predetermined fixed value,
Since a warning indicating that the air pressure of the tire 1A is low or worn is issued, the user knows that the steering wheel is heavy or easily slips, and can drive more carefully than usual to drive safely. Maintenance and replacement of 1A can be performed to ensure safety. In addition, if the difference between the regularly calculated running coefficient and the predetermined reference running coefficient temporarily exceeds a predetermined fixed value while the vehicle is running, a warning indicating that the tire 1A is idling or slipping is issued. The user can drive more carefully and drive safely. When the tire 1A has a prescribed air pressure, or the tire 1A has a prescribed air pressure and the vehicle is running on a road with good road surface conditions without wear, the operation unit 6 automatically controls the reference traveling coefficient. By performing the setting instruction operation, it is possible to automatically set the correct reference running coefficient according to the combination of the type of the tire 1A and the vehicle type.

In the above-described embodiment, the change in the difference between the running coefficient periodically obtained during running and the reference running coefficient is monitored to determine the deterioration of the running state. The rotational speed and the vehicle speed may be periodically measured, and the deterioration of the traveling state may be determined by monitoring the change in the error rate between the vehicle speed calculated using the former rotational speed and the reference traveling coefficient and the measured vehicle speed. . Specifically, in the flowcharts of FIGS. 3 and 4, the portion of FIG. 4 may be modified as shown in FIG. In the first storage area 5A of the memory 5, a reference running coefficient (new (the air having a specified air pressure is contained, and the air is not worn, and is excellent) is determined by the vehicle manufacturer in advance according to the combination of the type and the type of the tire 1A. as the moving distance) a ₀ of the vehicle when the one rotation without tire 1A good road road tire 1A of a state) idles and slip is already stored (see FIG. 2), and 3 The running state monitoring / warning process based on the combination of FIG. 6 will be briefly described.

The control unit 8 clears the second storage area 5B of the memory 5 and sets i indicating the number of the error rate data to 1 (steps S10 and S11 in FIG. 3). Next, whether the automatic setting instruction operation of the reference running coefficient has been performed on the operation unit 6 or not.
It is checked whether a manual input operation of the reference running coefficient has been performed or whether reading data of the reference running coefficient has been input from the magnetic card reader 7 (steps S12 and S12).
16, S18), if both are NO, proceed to FIG. 6,
The rotation speed data detected by the rotation speed detection unit 2 and the GPS
Each vehicle speed data detected by the receiver 3, some predetermined fixed time T (T is, for example, 2-20 seconds) to measure the rotational speed N ₁ and vehicle speeds V ₁ to by averaging between sampling and the (Step S20). Then, it is checked whether V ₁ > 0 (step S21). If NO while the vehicle is stopped, the error rate data cannot be calculated, and the process returns to step S10 in FIG.

If the answer is YES in step S21 while the vehicle is running, the calculation of a ₀ × N ₁ is performed, and the tire 1A is filled with the air having the specified air pressure and the tire 1A is in the ideal tire condition without wear. calculating a vehicle speed v ₁ computational, assuming that the vehicle has traveled without idling and slip good road road conditions, further computational performs computation of (v ₁ -V ₁₎ / v ₁ calculates an error rate [Delta] [epsilon] ₁ of the vehicle speed measured with respect to the vehicle speed, is added and stored in the second storage area 5B. The first is stored in the leading address AD ₁ of the second storage area 5B (step S22', S23'). Subsequently, it is checked whether n (n is an integer satisfying 1 <n ≦ N, for example, 10 to 20) or more error rate data is stored in the second storage area 5B (step S24 ′). Then, since it is NO, i is incremented to 2 (step S
32), and return to step S12 in FIG.

Each check is performed to determine whether an operation for automatically setting the reference running coefficient has been performed on the operation unit 6, whether a manual input of the reference running coefficient has been performed, and whether reference data of the reference running coefficient has been input from the magnetic card reading unit 7. (Steps S12, S16, S18), and N
If it is O, the process proceeds to FIG. 6, where the rotation speed data detected by the rotation speed detection unit 2 and the vehicle speed data detected by the GPS receiver 3 are each sampled during T and averaged to obtain the rotation speed N _2. and measuring the vehicle speed V ₂ (step S20).
Then, it is checked whether V ₂ > 0 (step S 21). If YES again, a ₀ × N ₂ is calculated to calculate the calculated vehicle speed v ₂ , and further, (v ₂ −V ₂ ) / v of the measured relative speed of the calculation performed ₂ calculation speed error rate Δε
₂ is calculated and added to and stored in the second storage area 5B.
[Delta] [epsilon] ₂ are stored in the second address AD ₂ of the second storage area 5B (step S22', S23'). Hereinafter, by repeating the same processing, data indicating the error rate between the calculated vehicle speed calculated using the rotation speed and the reference traveling coefficient and the actually measured vehicle speed is periodically accumulated in the second storage area 5B. To go.

Thereafter, the start address of the second storage area 5B
AD₁From address AD_nJust n errors by
When the difference rate data is accumulated (i = n), at step S24 '
YES. At this time, the control unit 8
The latest n error rate data Δε stored in the area 5B
_n~ Δε₁Are all given positive thresholds Δε_THLess than
It is checked whether it is below (step S25 '). Here, FIG.
Δε as shown in (1) _n~ Δε₁Is Δε_THLess than
When the control unit 8 is turned off, the control unit 8
Good condition and abrasion condition, causing slip and slip
And it is determined that the traveling state is good (step S
25 '), display "Good running condition" on display unit 4
Is performed (step S26). This allows the user
The tire 1A has good air pressure and wear conditions,
It can be seen that no slip or slip occurred. Step S
After 26, i is incremented to n + 1 (step
Step S32), and returns to step S12 of FIG.

Next error data Δε_{n + 1}To the second storage area 5
(N + 1) th address AD of B _{n + 1}And remembered
Also at step S24 ', the answer is YES, and the latest n errors
Difference data Δε_{n + 1}~ Δε_TwoFor all the prescribed positive
Threshold Δε_THCheck whether it is below (Step S25)
´). Again, as shown in FIG._{n + 1}~ Δε_Two
Is Δε_THWhen it is smaller, the control section 8
Causes the display unit 4 to display "Good running condition" (step
Step S26). Then, i is incremented and n + 2
After that, the process returns to step S12 in FIG. Hereinafter, similarly
Then, the control unit 8 is stored in the second storage area 5B.
Among them, the latest n error data Δε_i~ Δε _{i-n + 1}Nitsu
And all have a predetermined positive threshold Δε_THCheck below
If YES, display "Good running condition" on the display unit 4
Is performed (step S26). Step S23
´ at Δε_iTo be stored in the second storage area 5B.
When the last address AD_NError rate data is stored up to
If already done, start address AD₁Return to memorize.

[0029] Then, it lowered the deflated tire pressure 1A, or when the tire 1A is worn, the difference between the vehicle speeds V ₁ to the actually measured vehicle speed v ₁ on the calculations that are calculated by the process at step S22' Becomes large, and the error rate data becomes large. If the control unit 8 checks in step S25 'that all of the latest n error data Δε _{i to} Δε _{i -n + 1} are equal to or less than a predetermined positive threshold value Δε _TH , then the result is NO. Positive threshold Δε _TH
Is checked (step S27 '). Here, as shown in FIG. 7 (2), when any of Δε _{i to} Δε _{i −n + 1} exceeds Δε _TH (that is, if the error rate data continuously exceeds the threshold for a certain period of time, ), Tire 1A
It is determined that the running condition has deteriorated due to the decrease in the air pressure of the tire or the wear of the tire 1A (YE in step S27 ').
S), the display unit 4 displays “deterioration of running state” and “reduction of tire pressure or occurrence of tire wear” (step S).
28). After step S28, i is incremented to n + 1 (step S32), and step S1 in FIG.
Return to 2.

From the warning message on the display unit 4, the user can know that the tire 1A has deteriorated in the air pressure state or the wear state, and can drive more carefully than usual and try to drive safely. Maintenance and replacement of 1A can be performed to ensure safety. Inflate the tire 1A, or the prescribed air pressure, it is after the worn tires 1A was replaced with a new difference between the vehicle speed V _i was measured with the vehicle speed v _i on calculation is calculated by the process at step S22' Becomes smaller and the error rate data becomes smaller.
Returns to "Good running condition" (YES in step S25 ', S26).

In contrast, the air pressure of the tire 1A decreases
Road condition is not worn and not worn.
Idling or slipping of tire 1A due to running on a rough road
Occurs, the total calculated in step S22 'is temporarily calculated.
The arithmetic vehicle speed v₁And the actual measured vehicle speed V₁The difference between
Large error rate data is stored in the second storage area 5B.
You. Then, the control unit 8 proceeds to step S25 '.
And the latest n error rate data Δε_i~ Δε_{i-n + 1}Nitsu
All predetermined positive threshold Δε_THIf you check below
If the answer is NO, then all the predetermined positive threshold values Δε
_THIs checked (step S27 ').
Again, if the answer is NO, then the latest n error data
Δε_i~ Δε_{i-n + 1}A predetermined positive threshold Δε
_THIs checked (step S29 ').
Here, as shown in FIG. _i~ Δε_{i-n + 1}One
Part only Δε_TH(That is, the error rate data
(If it temporarily exceeds the threshold value), the tire 1A idles
It is judged that the running condition is getting worse due to
("YES" in step S29 '), and the display unit 4 displays
Indication of "condition deterioration" and "tire slip or slip"
Is performed (step S30). Step S30
And i is incremented to n + 1 (step S3
2) Return to step S12 in FIG.

From the warning message on the display unit 4, the user can know that the tire 1A is idling or slipping, and can drive more carefully than usual to keep safe driving. If there is no idle and slip of the tire 1A, the difference between the vehicle speeds V ₁ to the actually measured vehicle speed v ₁ on the calculation is calculated by the process at step S22' is reduced,
The display on the display unit 4 returns to “good running condition” (Step S)
YES at 25 ', S26). Note that step S2 in FIG.
If NO in any of 5 ', S27', and S29 ', the display on the display unit 6 is stopped because some malfunction has occurred (step S31).

According to the modified example of the combination of FIG. 3 and FIG. 6, when the error rate between the calculated vehicle speed periodically obtained and the actually measured vehicle speed exceeds a predetermined constant value while the vehicle is running, the running state is changed. Since a warning indicating deterioration is issued, the user
It can be seen that the traveling state is deteriorated due to a decrease or wear of the air pressure of A, a tire idling or a slip, and the vehicle can be driven more carefully than usual to drive safely.
More specifically, when the error rate between the calculated vehicle speed periodically calculated and the actually measured vehicle speed continuously exceeds a predetermined constant value for a predetermined fixed period during running of the vehicle, the air pressure of the tire 1A decreases. Alternatively, a warning indicating wear is given, so that the user knows that the steering wheel is heavy or slips easily, and can drive safely with more careful driving than usual, and can also perform maintenance and replacement of the tire 1A. To ensure safety. Also, if the error rate between the calculated vehicle speed calculated periodically and the actually measured vehicle speed temporarily exceeds a predetermined constant value while the vehicle is running, a warning indicating that the tire 1A is idling or slipping is issued, The user can drive more carefully and drive safely. When the tire 1A has a prescribed air pressure, or the tire 1A has a prescribed air pressure and the vehicle is running on a road with good road surface conditions without wear, the operation unit 6 automatically controls the reference traveling coefficient. By performing the setting instruction operation, it is possible to automatically set the correct reference running coefficient according to the combination of the type of the tire 1A and the vehicle type, just like the case of the combination of FIG. 3 and FIG.

In the above-described embodiment and the modification,
4, although V _i in step S21 of FIG. 6 in the case of zero was returned to the step S10 in FIG. 3, skip Step S21, after step S22 or S in step S20
The process may proceed to 22 '. The vehicle speed is detected by G
It was done by satellite navigation using PS receiver,
The present invention is not limited to this, and detection may be performed by self-contained navigation using an acceleration sensor.

[0035]

According to the present invention, a warning is issued when tire pressure drops or wear occurs during running, or when tire running or slipping occurs and running conditions are deteriorated, a warning is issued, so that the user can use the tires. It can be seen that the running condition is deteriorating due to a decrease or wear of the air pressure, idling or slippage of the tires, and the driver can drive more carefully than usual to drive safely.

[Brief description of the drawings]

FIG. 1 is a block diagram of a traveling state monitoring device according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram of storage contents of a memory in FIG. 1;

FIG. 3 is a diagram showing a driving state monitoring / control operation by a control unit in FIG. 1;
It is a flowchart which shows a warning process.

FIG. 4 is a diagram showing a driving condition monitoring / control operation by a control unit in FIG.
It is a flowchart which shows a warning process.

FIG. 5 is a diagram illustrating a traveling state determination method.

FIG. 6 is a flowchart showing a running state monitoring / warning process according to a modification of FIG. 4;

FIG. 7 is a diagram illustrating a traveling state determination method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Wheel 1A Tire 2 Rotation speed detection part 3 GPS receiver 4 Display part 5 Memory 6 Operation part 7 Magnetic card reading part 8 Control part 10 Running state monitoring device 20 Magnetic card

Claims (9)

[Claims] 1. A vehicle speed measuring means for measuring a rotational speed of a wheel of a vehicle, a vehicle speed measuring device for measuring a vehicle speed, and a rotational speed and a vehicle speed measured by the rotational speed measuring device and the vehicle speed measuring device during traveling. Calculating means for calculating a running coefficient, which is a moving distance of the vehicle while the wheels are rotated by a predetermined reference rotation amount, monitoring a change in the running coefficient during running and calculating a difference between the running coefficient and a predetermined reference value. Monitoring means for determining that the running condition has deteriorated when the driving condition has exceeded a predetermined constant value; and warning means for outputting a warning of the running condition deterioration to the user when the monitoring means determines that the running condition has deteriorated. A running condition monitoring device for a vehicle. 2. The vehicle according to claim 1, wherein the reference value is a moving distance of the vehicle while the wheel in good tire condition rotates by the predetermined reference rotation amount without idling and slipping. Running condition monitoring device. 3. An operation means for performing a reference value automatic setting instruction operation, and when the reference value automatic setting instruction operation is performed by the operation means, the rotation speed and the vehicle speed measured by the rotation speed measurement means and the vehicle speed measurement means at that time. 2. The vehicle according to claim 1, further comprising: a reference value setting unit configured to calculate a moving distance of the vehicle while the wheel rotates by the predetermined reference rotation amount using the reference value and set the reference value as a reference value. Running condition monitoring device. 4. A vehicle comprising: a rotational speed measuring means for measuring a rotational speed of a wheel of a vehicle; a vehicle speed measuring means for measuring a vehicle speed; a rotational speed and a vehicle speed measured by the rotational speed measuring means and the vehicle speed measuring means. Calculating means for calculating a running coefficient which is a moving distance of the vehicle while the wheel rotates by a predetermined reference rotation amount; and monitoring a change in the running coefficient during running, and determining a difference between the running coefficient and a predetermined reference value by a predetermined value. Monitoring means for determining that tire pressure drop or wear has occurred when the state exceeding the predetermined value has continued for a predetermined time; and when the monitor means has determined that tire pressure decrease or wear has occurred, the tire And a warning means for outputting a warning indicating that the air has decreased or the tire has worn. 5. A vehicle comprising: a rotational speed measuring means for measuring a rotational speed of a wheel of a vehicle; a vehicle speed measuring means for measuring a vehicle speed; and a rotational speed and a vehicle speed measured by the rotational speed measuring means and the vehicle speed measuring means. Calculating means for calculating a running coefficient which is a moving distance of the vehicle while the wheel rotates by a predetermined reference rotation amount; and monitoring a change in the running coefficient during running, and determining a difference between the running coefficient and a predetermined reference value by a predetermined value. A monitoring means for determining that a tire idling or slip has occurred when a state exceeding a certain value has temporarily occurred; and a monitoring means for judging that a tire idling or slip has occurred. A running state monitoring device for a vehicle, comprising: a warning unit that outputs a warning that a slip has occurred. 6. A rotational speed measuring means for measuring a rotational speed of a wheel of a vehicle, a vehicle speed measuring means for measuring a speed of the vehicle, and a wheel having a good tire condition runs only by a predetermined reference rotation amount without slipping or slipping. A storage means for storing a reference running coefficient which is a moving distance of the vehicle during the rotation, a vehicle speed calculated by using the rotation speed measured by the rotation speed measuring means and the reference running coefficient during running, and a measurement by the vehicle speed measuring means. Monitoring means for monitoring a change in an error rate with respect to the detected vehicle speed, and determining that the running condition has deteriorated when the speed exceeds a predetermined constant value; and A vehicle running state monitoring device, comprising: warning means for outputting a warning of deterioration. 7. An operation means for performing a reference travel coefficient automatic setting instruction operation, and when the reference travel coefficient automatic setting instruction operation is performed by the operation means,
At that time, the moving distance of the vehicle during the rotation of the wheel by the predetermined reference rotation amount is calculated using the rotation speed and the vehicle speed measured by the rotation speed measurement unit and the vehicle speed measurement unit, and stored as a reference running coefficient. The running condition monitoring apparatus for a vehicle according to claim 6, further comprising: a reference running coefficient setting unit that stores the running condition in the vehicle. 8. A rotational speed measuring means for detecting a rotational speed of a wheel of a vehicle, a vehicle speed measuring means for measuring a speed of the vehicle, and a wheel having a good tire condition runs only by a predetermined reference rotation amount without slipping or slipping. A storage means for storing a reference running coefficient which is a moving distance of the vehicle during rotation; a vehicle speed calculated from the rotation speed measured by the rotation speed measuring means and the reference running coefficient during traveling; and a vehicle speed measured by the vehicle speed measuring means. Monitoring means for monitoring a change in an error rate with respect to the vehicle speed, and determining that air deflation of the tire or wear of the tire has occurred when a state exceeding a predetermined constant value continues for a predetermined fixed time; And warning means for outputting a warning to the user that the tire pressure has decreased or the tire has worn when it is determined that the tire pressure has decreased or the tire has worn. Running condition monitoring apparatus for a vehicle according to. 9. A rotational speed measuring means for measuring a rotational speed of a wheel of a vehicle, a vehicle speed measuring means for measuring a speed of a vehicle, and a wheel having a good tire condition runs only by a predetermined reference rotational amount without slipping or slipping. A storage means for storing a reference running coefficient which is a moving distance of the vehicle during rotation; a vehicle speed calculated from the rotation speed measured by the rotation speed measuring means and the reference running coefficient during traveling; and a vehicle speed measured by the vehicle speed measuring means. Monitoring means for monitoring a change in the error rate from the vehicle speed, and judging that a tire idling or slipping has occurred when a state exceeding a predetermined constant value temporarily occurs; and And a warning means for outputting, to the user, a warning that a tire slip or slip has occurred when the vehicle is running, the vehicle running state monitoring device is provided. .