JP2008137520A - Inflator for automobile tires - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose an inflator 1 for automobile tires realizing determination that an air chuck 4a has been mounted to a tire 3 even when the target pressure is the same as air pressure of the tire 3. <P>SOLUTION: The inflator 1 for automobile tires of the present invention is equipped with a control means 9 for determining that the air chuck 4a has been mounted to an air charging port 3a of the tire 3 by detecting subtle reduction of the pressure caused by an air feeding hose 4 being in an air-opening status for a moment when the air chuck 4a is mounted to the air charging port 3a after the air pressure of the air feeding hose 4 is kept constant. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an automotive tire inflator that automatically repeats charging and exhausting until a tire pressure reaches a target pressure when a target pressure is set.

  2. Description of the Related Art Conventionally, when a target pressure is set, inflating for an automobile tire that automatically repeats charging and exhausting until the tire air pressure reaches the target pressure is known. Among such air fillings for automobile tires, as shown in Patent Document 1, when starting charging / exhausting of a tire, there is one that pushes a start button provided on the body for filling an automobile tire.

  This car tire inflator had to repeat the reciprocation of the equipment and each tire for each tire when adjusting the air pressure of all four tires of the automobile.

  In addition, in order to solve the above problem in Japanese Patent Application Laid-Open Publication No. 2005-259405, in order to solve the above problem, when the target pressure is set, the vehicle tire inflator that automatically repeats charging and exhausting until the tire air pressure reaches the target pressure. As shown in the drawing, there was one that started charging / exhausting the tire triggered by the fact that the air chuck provided at the tip of the air supply hose was attached to the tire.

  This car tire inflator is constantly charged and exhausted by the solenoid valve so that the air pressure of the air supply hose converges to the target pressure.When the air pressure of the air supply hose does not improve despite the charge, Alternatively, it is determined that the air chuck is attached to the tire when the air pressure of the air supply hose does not decrease despite the exhaust, and charging / exhausting of the tire is started.

  However, in this air filling for automobile tires, it is necessary to continuously charge and exhaust air until it is determined that the air chuck is attached to the tire.

Japanese Patent Laid-Open No. 3-67711 Japanese Patent Publication No. 6-69964

  Therefore, the problem to be solved by the present invention is to improve the durability of the device, and even when an air chuck is attached to a tire having no pressure difference when comparing the tire pressure before adjustment with the target pressure, Judging that the air chuck is attached to the tire, and before the air chuck is attached to the tire, the air chuck is attached to the tire when the air pressure of the air supply hose is being charged and exhausted so as to approach the target pressure. However, it is the point which proposes the inflating for motor vehicle tires which realized that it was judged that the air chuck was attached to the tire.

  In order to solve the above-described problems, the present invention provides a tire and an air supply hose that are automatically and repeatedly charged and exhausted until the tire pressure reaches the target pressure when the target pressure is set. A pressure sensor for measuring air pressure; pressure adjusting means for adjusting each air pressure of the tire and the air supply hose by charging and exhausting; and an air pressure of the air supply hose by the pressure sensor and the pressure adjusting means. After the air pressure is kept constant, when the air chuck provided at the tip of the air supply hose is attached to the air inlet of the tire, the air supply hose is momentarily opened to the atmosphere, and the pressure slightly decreases. If the pressure sensor detects that the air chuck is installed, the vehicle is provided with a control unit that determines that the air chuck is attached to the tire and starts charging and exhausting the tire. To propose a nasty air pocket.

  Further, when the target pressure is set, a pressure sensor that measures each air pressure of the tire and the air supply hose in the auto tire filling that automatically repeats charging and exhausting until the tire air pressure reaches the target pressure, By adjusting the air pressure of the tire and the air supply hose by charging and exhausting, before the air pressure of the air supply hose is kept constant by the pressure sensor and the pressure adjustment means, When the air chuck is attached to a tire, the air supply is calculated by dividing a difference between an air pressure after a predetermined time has elapsed from the setting of the target pressure and an air pressure when the target pressure is set by the predetermined time When the rate of change in air pressure of the hose is lower than a predetermined value, it is determined that the air chuck is attached to the tire, and control means for starting charging and exhausting the tire is provided. Suggest inflator for an automobile tire.

  The vehicle tire inflator according to the present invention keeps the air pressure of the air supply hose constant before the air chuck is attached to the tire, so that the durability of the apparatus can be improved.

  In addition, in the pneumatic tire for automobile tires according to the present invention, after the air pressure of the air supply hose is kept constant, when the air chuck is attached to the air inlet of the tire, the air supply hose is temporarily opened to the atmosphere. Because it is detected that the air pressure is slightly reduced and it is judged that the air chuck is attached, the air chuck is attached to a tire that has no pressure difference when comparing the air pressure of the tire before adjustment with the target pressure. Sometimes it can be determined that the air chuck is attached to the tire.

  In addition, the pneumatic tire for an automobile tire according to the present invention includes an air pressure after a predetermined time has elapsed after the target pressure is set even if the air chuck is attached to the tire before the air pressure of the air supply hose is kept constant. It can be determined that the air chuck is attached to the tire from the air pressure change rate of the air supply hose calculated by dividing the difference from the air pressure when the target pressure is set by the predetermined time.

  Therefore, the vehicle tire inflator according to the present invention can accurately determine that the air chuck is attached to the tire. Therefore, before starting the charge / exhaust so that the air pressure of the tire approaches the target pressure, The amount of charge / exhaust determined according to whether it is attached to the tire is also accurate, so it does not take a long time to charge / exhaust the tire, and the completion of charging / exhausting to the tire pressure is accurate. Can be notified.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the description regarding the air pressure which appears after that shall be the gauge pressure on the basis of atmospheric pressure. FIG. 1 is a diagram showing a configuration of an automobile tire inflator according to the present invention. Reference numeral 1 denotes a main body for a car tire. Reference numeral 2 denotes an air tank, which stores air that fills the tire 3, and an automobile tire inflator 1 is connected thereto. Note that the air pressure of the air tank 2 is higher than the target pressure. Reference numeral 4 denotes an air supply hose, and an air chuck 4 a provided at the tip of the air supply hose 4 is attached to the charging port 3 a of the tire 3, so that the automotive tire inflater 1 supplies air to the tire 3. be able to.

  Reference numeral 5 denotes an operation board, and the user sets a target pressure by using the operation board. The operation board 5 is provided with an LED display portion 5a for displaying a target pressure, a plus key 5b for increasing the target pressure by pressing, and a minus key 5c for decreasing the target pressure by pressing.

  6 is a pressure control means, and the air tank 2 and the air supply hose 4 are connected to the pipe line, and the air pressure of the tire 3 and the air supply hose 4 is maintained at the target pressure by charging and exhausting. 6a is an electro-pneumatic high leg, and the air tank 2 and the pipe line communicate with each other. By opening the charging valve or the exhaust valve until the air pressure in the pipe reaches the set pressure, Adjust the air pressure. The electropneumatic high leg 6 a is used to improve the air pressure of the tire 3 and the air supply hose 4.

  Reference numeral 6b denotes a check valve, which is connected to the electropneumatic high leg 6a and the air supply hose 4 so that air cannot flow from the air supply hose 4 to the electropneumatic high leg 6a. Thus, after the electropneumatic high leg 6a causes the air to flow into the tire 3 and the air supply hose 4, each air pressure of the tire 3 and the air supply hose 4 is a dynamic pressure, but the set pressure of the electropneumatic high leg 6a is By setting to 0 kPa, each air pressure of the tire 3 and the air supply hose 4 becomes a static pressure.

  An exhaust solenoid valve 6c communicates with the check valve 6b, the air supply hose 4 and the pipe, and exhausts the air in the pipe by opening the valve. The exhaust solenoid valve 6 c is used to reduce the air pressure of the tire 3 and the air supply hose 4.

  A pressure sensor 7 measures the air pressure of the tire 3 and the air supply hose 4 by measuring the air pressure of the pipe line connecting the air supply hose 4 and the check valve 6b. A buzzer 8 informs the user that the tire 3 is being charged / exhausted and that the tire 3 has been charged / exhausted.

  Reference numeral 9 denotes a control means, which stores a ROM 9a for storing a program for controlling the vehicle tire inflator 1; a CPU 9b for executing the program stored in the ROM 9a; and temporarily storing parameters necessary for executing the program. It comprises a RAM 9c, an operation board 5, a pressure control means 6, a pressure sensor 7, and a buzzer 8 and an I / O 9d for exchanging information.

  The control means 9 reads the target pressure set by the user operating the operation board 5 and the air pressure measured by the pressure sensor 7, and sets the set pressure of the electropneumatic high leg 6a to an air pressure higher than the target pressure. As a result, the air pressure to be adjusted is improved. The amount of charge varies depending on the charging time. The control means 9 lowers the air pressure to be adjusted by opening the valve of the exhaust electromagnetic valve 6c. The displacement varies depending on the exhaust time.

  Further, the control means 9 informs the user that the tire 3 is being charged / exhausted by sounding the buzzer 8 at short intervals at regular intervals when the tire 3 is being charged / exhausted. When the charging / exhausting of the tire 3 is completed, the buzzer 8 is sounded at a long interval to notify the user that the charging / exhausting of the tire 3 is completed.

  Further, the control means 9 switches the control process by switching the target mode. There are two types of target modes: a tire mode and an air supply hose mode. One is a tire mode, which is a target mode in a case where charging / discharging is performed in a state where the air chuck 4 a is attached to the tire 3. The other is an air supply hose mode, which is a target mode when charging / exhausting is performed in a state where the air chuck 4 a is not attached to the tire 3.

  Depending on the target mode, when charging / discharging the tire 3 and the air supply hose 4, the charging / discharging time changes. When the target mode is the air supply hose mode, the air supply hose 4 has a smaller volume than the tire 3, and therefore the time for charging and exhausting is shortened.

  In addition, after charging / exhausting the tire 3 and the air supply hose 4 according to the target mode, the control means 9 measures the tire 3 and the air supply hose 4 in order to measure the respective air pressures of the tire 3 and the air supply hose 4. , And until the air pressure of the air supply hose 4 changes from dynamic pressure to static pressure, this waiting time changes. When the target mode is the air supply hose mode, the air supply hose 4 has a smaller volume than the tire 3, so the waiting time is shortened.

  2-5 is a flowchart which shows the control processing of the pneumatic tire 1 for motor vehicle tires in this invention. Hereinafter, according to this flowchart, the control process of the automotive tire filling 1 will be described.

  First, when the air chuck 4a is attached to the charging port 3a of the tire 3, it is detected that the air supply hose 4 is temporarily opened to the atmosphere and the pressure is slightly reduced, and the air chuck 4a Next, the determination process (a) for determining that it is attached to 3 will be described. This determination process (a) is a subroutine performed in S5 of FIG. FIG. 4 is a flowchart showing this subroutine.

  As shown in FIG. 4, when the determination process (a) is started, the control means 9 first measures the air pressure of the air supply hose 4 every 1 ms (S23) (S24). Next, the control means 9 stores the measured air pressure in the RAM 9c (S25). After 10 ms (S26), the control means 9 excludes the highest and lowest measured air pressures and takes the average of the eight air pressures (S27). The data is stored in the RAM 9c (S28). Next, the control means 9 determines whether or not the difference between the average of the current air pressure and the average of the previous air pressure is 5 kPa or more (S29). If the difference between the current air pressure average and the previous air pressure average is 5 kPa or more, the determination process proceeds to S30. Here, the control means 9 sets the target mode to the tire mode (S30). If the difference between the average of the current air pressure and the average of the previous air pressure is less than 5 kPa, the determination process (a) ends.

  Subsequently, a determination process (b) for determining whether or not the air chuck 4a is attached to the tire 3 in accordance with the air pressure change rate to be adjusted will be described. This determination process (b) is a subroutine performed in S22 of FIG. FIG. 5 is a flowchart showing this subroutine.

  As shown in FIG. 5, when the determination process (b) is started, the control means 9 first determines whether or not the adjustment mode is the charge mode (S31). This adjustment mode is the charge mode when the air pressure to be adjusted needs to be lower than the target pressure at S13 in FIG. 3 (S14), and the air pressure to be adjusted is lower than the target pressure. When it is necessary to exhaust highly, the exhaust mode is set (S15). If the adjustment mode is the charge mode, the determination process proceeds to S32. If the adjustment mode is the exhaust mode, the determination process proceeds to S33. In S32, the control means 9 determines whether or not the target pressure is 500 kPa or more (S32). If the target pressure is 500 kPa or more, the determination process proceeds to S34 and the threshold value is 100 kPa / s (S34). If the target pressure is less than 500 kPa, the determination process proceeds to S35 and the threshold value is 200 kPa / s ( S35). In S33, the control means 9 determines whether or not the target pressure is 200 kPa or more (S33). If the target pressure is 200 kPa or more, the determination process proceeds to S37. If the target pressure is less than 200 kPa, the determination process proceeds to S36, and the threshold value is 20 kPa / s (S36). In S37, the control means 9 determines whether or not the target pressure is 350 kPa or more (S37). If the target pressure is 350 kPa or more, the determination process proceeds to S39, and the threshold value is 50 kPa / s (S39). If the target pressure is less than 350 kPa, the determination process proceeds to S38, and the threshold value is 100 kPa / s. Next, the control means 9 calculates the air pressure change rate to be adjusted by taking the absolute values of the air pressure before charge / exhaust and the air pressure after charge / exhaust and dividing this by the charge / exhaust time (S40). The parameters necessary for this calculation are obtained in S11, S16, S17, and S21 in FIG. 3 before the determination process is performed. Next, the control means 9 determines whether or not the air pressure change rate is lower than the threshold value determined in S34, S35, S36, S38, S39 (S41). If the air pressure change rate to be adjusted is lower than the threshold value, the determination process proceeds to S42. Here, the control means 9 sets the target mode to the tire mode (S42). If the air pressure change rate to be adjusted is higher than the threshold value, the determination process proceeds to S43. Here, the control means 9 sets the target mode to the air supply hose mode (S43). Then, the determination process (b) ends.

  Subsequently, the control process (A) when the air chuck 4a is attached to the tire 3 after the air pressure of the air supply hose 4 is kept constant will be described. It is assumed that the tire 3 has an air pressure of 200 kPa, the air supply hose 4 has an air pressure of 200 kPa, and a target pressure of 200 kPa.

  Assume that the user attaches the air chuck 4a to the tire 3 after the charge / exhaust (S3) to the air supply hose 4 is completed and the air pressure of the air supply hose 4 is kept constant. Thereby, when the air chuck 4a is attached to the charging port 3a of the tire 3, the control means 9 detects that the air supply hose 4 is in an atmosphere open state for a moment and the pressure is slightly reduced, It is determined that the air chuck 4a is attached to the tire 3, and the target mode is switched from the air supply hose mode to the tire mode. (S5), the control process proceeds to S7. Here, the control means 9 determines whether or not the target mode is the tire mode (S7). Since the target mode is switched from the air supply hose mode to the tire mode in S5, the control process proceeds to S8. Here, the control means 9 waits for the air pressure of the tire 3 to change from dynamic pressure to static pressure (S8). Since the tire 3 has an air pressure of 200 kPa and the air supply hose 4 has an air pressure of 200 kPa, both air pressures are originally balanced. Next, the control means 9 charges and exhausts the tire 3 (S3).

  As shown in FIG. 3, when the control means 9 starts to charge / exhaust the tire 3, the control means 9 first determines whether or not the pressure difference between the air pressure of the tire 3 and the target pressure is less than 10 kPa (S9). Since the air pressure of the tire 3 is 200 kPa, the target pressure is 200 kPa, and the pressure difference is less than 10 kPa, the control process proceeds to S10. Here, the control means 9 determines whether or not the target mode is the tire mode (S10). Since the target mode is the tire mode, the control process proceeds to S12. Here, the control process 9 sounds an end buzzer (S12), and ends charging and exhausting the tire 3. Thereafter, the user removes the air chuck 4 a from the tire 3.

  Subsequently, the control process (B) when the air chuck 4a is attached to the tire 3 before the charge / exhaust (S3) to the air supply hose 4 is finished and the air pressure of the air supply hose 4 is kept constant. ). It is assumed that the air pressure of the tire 3 is atmospheric pressure, the air pressure of the air supply hose 4 is 150 kPa, the target pressure is 200 kPa, and the target mode is the air supply hose mode.

  As shown in FIG. 3, it is assumed that the user attaches the air chuck 4a to the tire 3 when the control means 9 is filling the air supply hose 4 in S16. When the air supply hose 4 is filled (S18), the control means 9 waits for the air pressure of the air supply hose 4 to become a static pressure (S20). Thereby, the air pressure with the air supply hose 4 becomes 180 kPa. Next, the control means 9 stores the adjusted air pressure of the air supply hose 4 in the RAM 9c (S21). Next, the control means 9 calculates the air pressure change rate of the air supply hose 4 and determines whether or not the air chuck 4a is attached to the tire 3 (S22). Since the air chuck 4a is already attached to the tire 3, the volume of the tire 3 is large, and the air pressure change rate of the air supply hose 4 is low, so that the target mode is switched from the air supply hose mode to the tire mode. Next, the control means 9 determines whether or not the pressure difference between the air pressure of the tire 3 and the target pressure is less than 10 kPa (S9). The air pressure of the tire 3 is 180 kPa, the target pressure is 200 kPa, and the pressure difference is 10 kPa or more. Therefore, the control process proceeds to S11. Here, the control means 9 stores the air pressure of the tire 3 before adjustment in the RAM 9c (S11). Next, the control means 9 determines whether or not the air pressure of the tire 3 is lower than the target pressure (S13). Since the air pressure of the tire 3 is 180 kPa, the target pressure is 200 kPa, and the air pressure of the tire 3 is lower than the target pressure, the control process proceeds to S14. Here, the control means 9 sets the adjustment mode to the charging mode (S14), determines the charging time, stores it in the RAM 9c (S16), charges the tire 3 (S18), and the air pressure of the tire 3 is static pressure. It waits to become (S20). Thereby, the air pressure of the tire 3 becomes 200 kPa. Next, the control means 9 stores the adjusted air pressure of the tire 3 in the RAM 9c (S21). Next, the control means 9 calculates the air pressure change rate of the tire 3 and determines whether or not the air chuck 4a is attached to the tire 3 (S22). Since the air chuck 4a is already attached to the tire 3, the volume of the tire 3 is large, and the air pressure change rate of the tire 3 is low, so the target mode remains the tire mode. Since the control process from here until the control means 9 completes the charging / exhausting of the tire 3 is the same as the control process (A), the description thereof will be omitted.

It is a figure which shows the structure of the pneumatic tire 1 for motor vehicle tires in this invention. 3 is a flowchart showing a control process of the automotive tire inflator 1 according to the present invention. It is a flowchart which shows the control process of the charge / exhaust to adjustment object. It is a flowchart which shows the judgment process (a) of the air chuck | zipper installation by the air supply hose 4 being in the air release state for a moment, and a pressure falling slightly. It is a flowchart which shows the judgment process (b) of the air chuck attachment by the air pressure change rate of adjustment object.

DESCRIPTION OF SYMBOLS 1 Automobile tire filling 2 Air tank 3 Tire 3a Filling port 4 Air supply hose 4a Air chuck 5 Operation board 5a LED display part 5b Plus key 5c Minus key 6 Pressure control means 6a Electropneumatic high leg 6b Check valve 6c Exhaust electromagnetic Valve 7 Pressure sensor 8 Buzzer 9 Control means 9a ROM
9b CPU
9c RAM
9d I / O

Claims (2)

When the target pressure is set, in the auto tire filling that automatically repeats charging and exhausting until the tire air pressure reaches the target pressure,
A pressure sensor for measuring each air pressure of the tire and the air supply hose;
Pressure adjusting means for adjusting each air pressure of the tire and the air supply hose by charging and exhausting;
After the air pressure of the air supply hose is kept constant by the pressure sensor and the pressure adjusting means, when an air chuck provided at the tip of the air supply hose is attached to the tire charging port, Control means for determining that the air chuck is attached to the tire and starting charging / exhausting to the tire when the pressure sensor detects that the air supply hose is open to the atmosphere for a moment and the pressure is slightly reduced. A pneumatic tire for an automobile tire characterized by comprising: When the target pressure is set, in the auto tire filling that automatically repeats charging and exhausting until the tire air pressure reaches the target pressure,
A pressure sensor for measuring each air pressure of the tire and the air supply hose;
Pressure adjusting means for adjusting each air pressure of the tire and the air supply hose by charging and exhausting;
If the air chuck is attached to the tire before the air pressure of the air supply hose is kept constant by the pressure sensor and the pressure adjusting means, the air pressure after a predetermined time has elapsed since the target pressure was set When the air pressure change rate of the air supply hose calculated by dividing the difference from the air pressure when the target pressure is set by a predetermined time is lower than a predetermined value, it is determined that the air chuck is attached to the tire; An automotive tire inflator comprising control means for starting charging and exhausting of a tire.

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