KR20080053975A - Monitoring system of incline car / tire wear and method thereof - Google Patents

Abstract

A tire wornout and leaned vehicle monitoring system and a method thereof are provided to improve safety and convenience by sensing a difference of dynamic radius and by allowing a driver to monitor a vehicle pull or tire wear state due to data sensed from a tire wheel speed sensor and a tire pressure sensor. A tire wornout and leaned vehicle monitoring system comprises as follows. A steering wheel angle sensor(1) senses and outputs a steering angle of a steering wheel. A tire wheel speed sensor(3) senses and outputs rotation speed of each tire wheel. A tire pressure sensor(4) senses and outputs air pressure in each tire. A brake switch(6) senses and outputs whether a brake is operated. A control unit(5) determines a vehicle pull or tire wear state by comparing the rotation speed and the tire pressure with reference values and outputting determined results. In addition, a display(2) displays the results on a screen due to output of the control unit.

Description

Monitoring System of Incline Car / Tire Wear and Method

1 is a view showing an example of setting the appropriate size of the companion diameter by dividing the tire wear state in three stages,

2 is a block diagram of a tire wear and vehicle pull monitoring system according to the present invention,

3 is a flow chart of the vehicle monitoring method according to the invention,

Figure 4 is a flow chart of the tire wear monitoring method according to the invention.

<Description of the symbols for the main parts of the drawings>

1: steering wheel angle sensor 2: display

3: tire wheel speed sensor 4: tire pressure sensor

5: control unit 6: brake switch

7: tire

The present invention relates to a tire wear and vehicle tilt monitoring system and a method thereof, and more particularly, to detect a difference in tire travel diameters based on data information of a tire wheel speed sensor and a tire inflation pressure sensor to inform a driver of a vehicle tilt and tire wear state. The present invention relates to a monitoring system and a method thereof.

Generally, tires are installed in various automobiles so as to rotate while being in contact with the ground. The tires are worn by the frictional force on the contact surface which contacts the ground during long-term use, and the tires should be replaced when the tire is worn out for a predetermined amount.

Symbols that can confirm the amount of wear of the tire are displayed on both circumferential surfaces of the tire, and the amount of wear of the tire is checked and replaced while checking this symbol.

However, since the symbols displayed on these tires are displayed in a small size at a predetermined position of the tire, the driver cannot directly check the replacement time of the tire. Therefore, there is a possibility that an accident may occur due to the damage of the tire during high-speed driving with heavy wear tires installed. .

On the other hand, tires mounted on a vehicle generate a manufacturing tolerance of a single product, and even when the tire passed within the manufacturing tolerance of the tire, the tire mounted on the left / right side has a difference in dynamic radius when the vehicle is running when the vehicle is running. Tilting may occur.

Vehicle tilt due to wheel balance adjustment or tire pressure difference can be checked through wheel balance equipment or tire pressure gauge, but vehicle tilt due to difference in tire diameter can not be checked, so if vehicle tilt occurs even if wheel balance and tire pressure are matched There was a problem that was difficult to identify the cause.

In addition, there is a problem that it is difficult to confirm the proper tire replacement because there is no system for monitoring the tire wear state.

The present invention has been made to solve the above-mentioned problems, by detecting the difference in tire diameter along the tire wheel speed sensor and tire air pressure sensor data information to monitor the driver's car tire and tire wear status to the driver safety and convenience securing and wichae the safety of the vehicle equipped with an ABS or the tire air pressure monitoring can be used as it a sensor or the like used in the system, minimizing the increase in cost due to implementation of the system by implementing a system according to the present invention, tire wear and vehicle displacement Its purpose is to provide a monitoring system and method thereof.

Tire wear and vehicle tilt monitoring system according to the present invention for achieving the above object, the steering wheel angle sensor for detecting and outputting the steering angle of the vehicle steering wheel, the tire is installed on the front, rear, left and right of the vehicle each tire A tire wheel speed sensor for detecting and outputting a rotation speed of a wheel, a tire air pressure sensor for detecting and outputting an air pressure inside each tire installed in the tire, and detecting and outputting an operation of a brake used for braking of the vehicle The tire wheel rotation speed and tire air pressure detected by the tire wheel speed sensor and the tire inflation pressure sensor are measured when the brake switch and the steering angle of the steering wheel are within the reference angles of the curve road and the brake signal is not input. Determination of vehicle tilt and tire wear is compared with the set reference value. And a control unit for outputting the determination result, and a display for displaying on the screen so as to visually check the state of the vehicle tilt or the timer wear by the output of the control unit.

In addition, the tire wear monitoring method according to the present invention, the vehicle steering wheel steering angle, the front and rear, right and left tire wheel rotational speed, the air pressure of each of the front, rear, left and right tires, detecting vehicle information such as whether the brake is activated or not Comparing the steering angle with a reference angle which is a reference of a curve road and monitoring the input of a brake actuation signal; Determining, comparing each tire wheel rotational speed with a wear reference value when the air pressure of each tire is normal, and determining tire wear when the tire wheel rotational speed is greater than the wear reference value. Flashing the wear indicator and rotating the front left and right tire wheels at an intermediate And determining whether to replace the tire by comparing the rear wearer's left and right tire wheel rotational speeds with the complete wearable rotational speeds, and flashing the tire replacement display unit on the display according to the determination result.

In addition, the vehicle monitoring method according to the invention, the steering angle of the vehicle steering wheel, the front and rear left and right tire wheel rotational speed, the air pressure of each tire before and after the left and right, and the vehicle information such as whether the brake operation, respectively Comparing the reference angle, which is the reference of the road, even if the steering angle is increased, and monitoring the input of the brake operating signal; and when the steering angle is smaller than the reference angle and the brake operating signal is not input, the air pressure of each tire is reduced. Determining whether it is normal; comparing the difference of rotational speeds of the left and right tire wheels with a preset reference value when the air pressure of each tire is normal; and when the difference of rotational speeds of the left and right tire wheels is greater than the reference value, Judging and blinking the pull / wear indicator of the display; and the front left, right, rear left and right of the vehicle. Judging whether the tire is to be replaced by comparing each rotational speed of the rear left and right tire wheels or the front left and right tire wheels with the rear tire wheel rotation speed or the front tire wheel rotation speed when it is determined that the vehicle is pulled; And flashing the tire replacement indicator of the display.

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

First, to assist in understanding the present invention will be described for the vehicle tilt, tire wear state, reference value setting.

Even when driving under normal conditions (except for brake operation, curve sections and unpaved roads), the difference in tire rotation speed is caused by the difference in the pneumatic pressure of the left and right tires and the accompanying diameter due to the tire product tolerance.

At this time, the moving distance of the vehicle = 2πR * N (R: tire accompanying diameter, N: tire wheel rotational speed), and the left and right tire wheel rotational speed increases as the companion diameter is smaller, the vehicle tilting occurs in the direction of the tire with a smaller companion diameter.

Next, FIG. 1 is a diagram illustrating an example of setting an appropriate size of a companion diameter by dividing a tire wear state into three stages.

As shown in FIG. 1, the tire is composed of a rubber layer 10, a belt 20, a carcass 30, and a bead 40. The rubber layer 10 protects the carcass 30. The tread 12 is divided into a shoulder 14 and a side wall 16.

The tread 12 is a part directly in contact with the road surface, is made of a rubber layer to protect the carcass 30 and increase the durability of the tire, the surface is inscribed in various shapes, that is, tread patterns according to the purpose of the tire have.

The tread pattern gradually disappears as the timer wears and disappears. Accordingly, the tire companion diameter decreases accordingly, so that the tire wheel rotation speed reference value according to the tire wear size and tire wear speed should be set according to the timer wear state.

In the present invention, the companion diameter in the first stage is R, the companion diameter in the second stage is RA, divided into the first stage of the new tire, the second stage of the intermediate wear state, and the third stage of the complete wear state. The companion mirror in the third stage is set to be RB.

In the following reference value setting, the tire companion diameter is set according to the tire specification, and the error range is generally defined to be 2 to 3% of the companion diameter.

Therefore, it is necessary to properly set the reference value of the tire wheel rotation speed, which is the standard for judging the vehicle tilt or timer wear, by acquiring prior data through the following test.

The proper reference value for the determination of tilting is to measure the tire wheel rotation speed when the same diameter of the right and left tires of the appropriate pneumatic pressure is mounted and when the left and right tires are mounted outside the tolerance diameter error range and compare / analyze the difference. Set the appropriate reference value.

The appropriate reference value for the wear judgment is set by dividing the appropriate reference value for the tire wheel rotation speed in the appropriate air pressure and companion diameter in three stages.

In the first stage, the new tire wheel rotation speed proper reference value is set. In the second stage, the front tire is worn out faster than the rear tire in the FR-driven vehicle. In the third step, the proper wear amount of the tire replacement and tire wheel rotation speed proper reference value are set as complete wear.

In addition, monitoring is excluded in this section because the difference in the rotation speed of the left and right tire wheels occurs regardless of the difference in the tire diameter when driving on the curb road or when the brake is operated.

That is, if the steering angle detected by the steering wheel angle sensor is higher than the reference angle (5 degrees) or brake operation is detected by the brake switch, monitoring is excluded.

2 is a block diagram of a tire wear and vehicle tilt monitoring system according to the present invention.

As shown in FIG. 2, a steering wheel angle sensor 1, a display 2, a tire wheel speed sensor 3, a tire air pressure sensor 4, a control unit 5, and a brake switch 6 are configured. do.

The steering wheel angle sensor 1 detects the steering angle of the steering wheel and outputs it to the control unit 5, and the control unit 5 checks whether the driving state of the straight or curved road is in accordance with the steering angle.

When the steering angle is greater than or equal to the reference angle (for example, 5 degrees), the control unit 5 recognizes the driving of the curve road and does not perform tire wear and vehicle tilt monitoring.

The tire wheel speed sensor 3 is installed on the tires 7 mounted on the front, rear, left, and right sides of the vehicle, and detects the rotational speed of each tire wheel and outputs it to the control unit 5.

The tire inflation pressure sensor 4 is installed on the tires 7 mounted on the front, rear, left, and right sides of the vehicle, and detects the air pressure inside each tire 7 and outputs it to the control unit 5.

The brake switch 6 is used for the brake used to brake the vehicle and detects whether the brake is operated and outputs it to the control unit.

The control unit 5 does not perform tire wear and vehicle monitoring when the brake operation signal is input from the brake switch 6.

The control unit 5 compares the rotation speed and air pressure detected by the tire wheel speed sensor 3 and the tire inflation pressure sensor 4 with the reference value when the steering angle of the steering wheel is within 5 degrees and the brake is not operated. The state of pulling and tire wear is judged, and the determination result is output to the display 2 serving as the monitoring device.

The display 2 is composed of a pull / wear display portion 2a and a tire replacement display portion 2b so as to be easily identified by the eye.

The control unit 5 flashes the pull / wear indicator 2a when the tire air pressure is normal and the difference in the front / rear left and right tire wheel rotation speeds is greater than the reference value, and flashes the tire replacement indicator 2b to replace a tire. Tell me if you want to.

In addition, the control unit 5 extinguishes the corresponding tire of the tire replacement indicator 2b when the tire air pressure is normal and the rotation speed of each tire wheel is greater than the second stage wear or the third stage wear reference value, and the pull / wear display portion Flashes (2a).

At this time, the number of flickers and cycles of the pull / wear display unit 2a may be different from the wear stage to distinguish the second stage from the third stage.

3 is a flowchart of a vehicle monitoring method according to the present invention.

Starting of the vehicle is turned on and each sensor of the system according to the present invention detects the vehicle information and outputs it to the control unit 5 (S302).

That is, the steering wheel angle sensor 1 is the steering angle of the steering wheel, the tire wheel speed sensor 3 is the tire wheel rotation speed, the tire air pressure sensor 4 is the air pressure of each tire, the brake switch 6 is Detects whether the brake is operating and outputs it to the control unit (5).

The control unit 5 compares the steering angle with the reference angle of 5 degrees among the sensed values sent from the sensors 1, 3, 4, and 6, and monitors whether a brake operation signal is input (S304), when the steering angle is larger than the reference angle. (Decides that the vehicle is traveling on a curve road) or when a brake operation signal is input, the process is performed again except for monitoring of the vehicle tilt and tire wear.

When the next steering angle is smaller than the reference angle and the brake operation signal is not input, it is determined whether the tire pressure of each tire is normal (S306), and when it is not normal, the tire is discharged or injected into the tire 7 which is not normal. After adjusting the air pressure to normal (S320), the step S302 is performed.

If it is determined that the air pressure of each tire is normal, the difference in the rotational speed of the left and right tire wheels is compared with the reference value (S308), and when the difference in the rotational speed of the left and right tire wheels is larger than the reference value, it is determined that the vehicle is tilted and the display 2 is tilted. / The abrasion display part 2a flashes (S310).

Next, the control unit 5 compares the rotational speed difference FR-FL of the front right tire wheel with the front reference value FT and is larger than the front reference value (that is, when the tilt occurs toward the front right side of the vehicle). E), comparing the rotational speeds (RL, RR) of the rear left and right tire wheels with the rotational speed (RT1) of the rear tire wheels (S312a), and the rotational speed of the rear right tire wheels is greater than that of the rear tire wheels. If the rotational speed of the rear left tire wheel is smaller than the rotational speed of the rear tire wheel (when tilting occurs to the rear right side of the vehicle), the rear right tire and the front left tire are placed on the tire replacement indicator 2b of the display 2. It is displayed to replace each other (S312a).

When the difference between the rotational speed difference FR-FL of the front left tire wheel is greater than the front reference value FT, the rotational speeds RL and RR of the rear left and right tire wheels are rotated by the rear tire wheel. Compared with the speed RT (S312b), if the rotation speed of the rear right tire wheel is smaller than the rotation speed of the rear tire wheel and the rotation speed of the rear left tire wheel is larger than the rotation speed of the rear tire tire wheel (rear left side of the vehicle). If the tilt occurs, the rear tire and the front left tire are displayed on the tire replacement display unit 2b of the display 2 so as to be replaced with each other (S314b).

Further, the control unit 5 compares the difference in the rotational speed RR-RL of the rear right tire wheel with the rear reference value RT, when the difference in the rotational speed of the rear right tire wheel is greater than the rear reference value (i.e. , When the vehicle is pulled toward the rear right side of the vehicle), the rotation speeds FL and FR of the front left and right tire wheels are compared with the rotation speed FT1 of the front tire tires (S312c), and the front right tire wheel is rotated. If the speed is greater than the rotational speed of the front tire wheel and the rotational speed of the front left tire wheel is smaller than the rotational speed of the front tire wheel (when tilting occurs in the front right side of the vehicle), the tire replacement indicator of the display 2 ( 2b) it is displayed to replace the rear right tire and the front right tire (S314c).

When the rotation speed difference (RR-RL) of the rear right tire wheel is compared with the rear reference value (RT), when the rotation speed difference of the rear right tire wheel is greater than the rear reference value, the rotation speed of the front left and right tire wheels (FL) (FR) is compared with the rotation speed (FT1) of the front tire wheel (S312d), the rotation speed of the front right tire wheel is smaller than the rotation speed of the front tire wheel and the rotation speed of the front left tire wheel is the front tire wheel. If the rotational speed of the vehicle is greater than the rotational speed of the vehicle (when tilting occurs to the front left side of the vehicle), the tire replacement display unit 2b of the display 2 displays the rear right tire and the front right tire to be replaced with each other (S314d).

Figure 4 is a flow chart of the tire wear monitoring method according to the present invention.

Starting of the vehicle is turned on and each sensor of the system according to the present invention detects the vehicle information and outputs it to the control unit (S402).

That is, the steering wheel angle sensor 1 is the steering angle of the steering wheel, the tire wheel speed sensor 3 is the tire wheel rotation speed, the tire air pressure sensor 4 is the air pressure of each tire, the brake switch 6 is Detects whether the brake is operating and outputs it to the control unit (5).

The control unit 5 compares the steering angle with the reference angle of 5 degrees among the sensed values sent from the sensors 1, 3, 4, and 6, and monitors whether a brake operation signal is input (S404), when the steering angle is larger than the reference angle. (Decides that the vehicle is traveling on the curve road) or when the brake operation signal is input, the process is performed again except for monitoring of the vehicle tilt and tire wear.

If the steering angle is smaller than the reference angle, and the brake operation signal is not input, the control unit 5 determines whether the air pressure of each tire is normal (S406), and when it is not normal, discharges or injects air into the non-normal tire. By adjusting the air pressure to normal (S420), and performs the step S402.

If it is determined that the tire pressure of each tire is normal. The tire wheel rotation speed is compared with the wear reference value (S408), and when the tire wheel rotation speed is larger than the wear reference value, it is determined that the tire is worn, and the pull / wear display portion 2a of the display 2 blinks (S410). ).

Next, the control unit 5 compares the front left and right tire wheel rotation speeds FL and FR with the front middle wear rotation speed FT2 (S412a), and the front left and right tire wheel rotation speeds are larger than the front middle wear rotation speed. In this case, the tire replacement display portion 2b of the display 2 displays the front tire and the rear tire to be replaced with each other (S414a).

The control unit 5 compares the front left and right tire wheel rotation speeds FL and FR with the front full wear rotation speed FT3 and the rear left and right tire wheel rotation speeds RL and RR with the rear full wear rotation speed RT3. Compared with (S412b), when the front left and right tire wheel rotation speeds are all smaller than the front full wear rotation speed and the rear left and right tire wheel rotation speeds are both greater than the rear full wear rotation speed, the tire replacement indicator of the display 2 is displayed. Indicated to (2b) to replace all the rear tires with new ones (S414b).

As described above, according to the present invention, by detecting the difference in the tire diameter along the tire wheel speed sensor and tire air pressure sensor data information to monitor the vehicle pull and tire wear status to the driver to ensure safety and convenience , the vehicle Implementing the system according to the present invention using the ABS or the sensor used in the tire air pressure monitoring system for the safety of the can be minimized to increase the cost of implementing the system.

Claims (6)

A steering wheel angle sensor for detecting and outputting a steering angle of a vehicle steering wheel; A tire wheel speed sensor installed on the tires mounted on the front, rear, left, and right sides of the vehicle to detect and output the rotation speed of each tire wheel; A tire air pressure sensor for detecting and outputting air pressure inside each tire installed in the tire; A brake switch that detects and outputs whether a brake used for braking the vehicle is operated; When the steering angle of the steering wheel is within a reference angle that is a reference of a curve road and a brake signal is not input, the tire wheel rotation speed and tire air pressure detected by the tire wheel speed sensor and the tire air pressure sensor are compared with a preset reference value. A control unit for judging the state of the vehicle pull and tire wear and outputting the determination result; Tire wear and vehicle monitoring system including a display for displaying on the screen to visually check the state of the vehicle tilt or timer wear by the output of the control unit. The method of claim 1, The display is a tire wear and vehicle monitoring system, characterized in that consisting of a pull / wear display unit and a tire replacement display is shown in a picture so that the eye can easily check. The method of claim 2, The control unit divides the timer wear state into three stages of new tire, middle wear, and complete wear, and sets a reference value for each wear stage, and determines the tire replacement time by comparing the reference value with the tire wheel rotation speed when the tire pressure is normal. Tire wear and vehicle monitoring system, characterized in that for outputting the determination result to the tire replacement display unit. The method of claim 2, When the tire pressure is normal and the difference between the front / rear left and right tire wheel rotation speeds is greater than the reference value, the control unit blinks the pull / wear indicator and blinks the tire replacement indicator to indicate which tire to replace. Tire wear and vehicle tracking monitoring system, characterized in that. Detecting vehicle information such as steering angle of the steering wheel of the vehicle, tire wheel rotation speed of the vehicle, front, rear, left and right tires, air pressure of each tire, and whether the brake is operated; Comparing the steering angle with a reference angle which is a reference of a road even if the steering angle is large, and monitoring an input of a brake operation signal; Determining whether the tire pressure is normal when the steering angle is smaller than the reference angle and a brake operation signal is not input; Comparing the difference between the rotational speeds of the left and right tire wheels with a preset reference value when the air pressure of each tire is normal; Determining that the vehicle is tilted when the difference between the rotational speeds of the left and right tire wheels is greater than a reference value and blinking the pull / wear display of the display; If it is determined that the front, left, right, or right of the vehicle is inclined, the rotation speed of the rear left and right tire wheels or the front left and right tire wheels is compared with the rear tire wheel rotation speed or the front tire wheel rotation speed to determine whether the tire is replaced. Judging the; And flickering the tire replacement display unit of the display according to the determination result. Detecting vehicle information such as steering angle of the steering wheel of the vehicle, tire wheel rotational speed of the vehicle, front, rear, left and right tires, air pressure of each tire, and brake operation; Comparing the steering angle with a reference angle which is a reference of a curve road and monitoring input of a brake actuation signal; Determining whether the tire pressure is normal when the steering angle is smaller than the reference angle and a brake operation signal is not input; Comparing each tire wheel rotational speed with a wear reference value when the air pressure of each tire is normal; Determining that the tire is worn out when the rotation speed of the tire wheel is greater than the wear reference value and blinking the pull / wear indicator of the display; Comparing the front left and right tire wheel rotation speeds with the middle wear rotation speed or the complete wear rotation speed and comparing the rear left and right tire wheel rotation speeds with the complete wear rotation speed to determine whether to replace the tire; The tire wear monitoring method comprising the step of flashing the tire replacement display of the display in accordance with the determination result.

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