# Patent

## Title
Pressure check tool and method of operating the same

## Abstract

At a portable tool, vehicle identification information is requested from a vehicle and responsively received from the vehicle. Based upon the vehicle information, one or more tire pressure sensor activation/trigger methods or parameters are determined. The determined one or more tire pressure sensor activation/trigger methods or parameters are used to activate singularly or a plurality of tire pressure monitoring (TPM) sensors at the vehicle. Tire pressure information is responsively received from the activated TPM sensors.

## Background
TECHNICAL FIELD
This application relates to tire pressure checking tools and the utilization of these tools.
BACKGROUND OF THE INVENTION
Rental vehicles from rental agencies typically do not have any valve caps on the valve stems of the vehicle wheels of the rental vehicles. The absence of valve caps is not because the cars were built this way by the different original equipment manufacturers (OEMs), but because rental agency employees do not want to handle the valve caps. Every time a vehicle is returned to the rental office, the agency is obligated, as a normal check up of the vehicle, to verify the pressure in each tire of the returned vehicle even if this vehicle could be equipped with an individual pressure display of each tire on the instrument panel of the vehicle.
In these situations, a technician has to remove the valve caps, one at a time, use a tire gauge and make a manual note with the corresponding vehicle identification number (VIN) that the vehicle has the correct pressure in the tires. Knowing that the technician will have to remove the caps again when the vehicle comes back from the next customer, the technician never bothers to put the caps on in order to save time, or over-inflates the tire to minimize having to deal with future pressure checks and re-inflations.
The valve cap of a valve stem has different critical functions. First, it protects the valve core mechanism of the valve stem against dirt, salt, and debris from the road and other sources that could eventually damage the valve core mechanism. If the valve core mechanism is damaged, its spring and seal functions could lead to potential leaks. If debris goes though the open valve mechanism during tire inflation, this debris could interfere with the valve core sealing cup mechanism leading to leaks.
Many late model vehicle valve caps, especially those equipped with tire pressure monitoring systems (TPMS), also have an O-ring seal that seals the valve stem from debris, water and so forth. This further improves the tightness of the valve stem assembly against air leaks by acting as a secondary seal. If the valve cap is not placed on the valve stem, or if some debris are located around the valve core mechanism spring, or if some debris are stuck on the cup seal, some potential air leaks could happen leading eventually to a leaking or flat tire. Furthermore, failure to reinstall valve caps exposes the end of the valve stem and valve core to potentially highly corrosive brine solutions used for ice melting on highways, automotive/wheel cleaning chemicals, and so forth.
The non-replacement of the caps potentially results in the above-mentioned problems. Consequently, some user dissatisfaction has resulted from these previous instances where the cap is not reinstalled.



BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the disclosure, reference should be made to the following detailed description and accompanying drawings wherein:
FIG. 1 comprises a block diagram of a system for using a multi-function tire pressure check tool according to various embodiments of the present invention;
FIG. 2 comprises a flowchart of an approach for using a multi-function (described herein) tire pressure check tool according to various embodiments of the present invention;
FIG. 3 comprises a block diagram of a multi-function tire pressure check tool according to various embodiments of the present invention.



Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity. It will further be appreciated that certain actions and/or steps may be described or depicted in a particular order of occurrence while those skilled in the art will understand that such specificity with respect to sequence is not actually required. It will also be understood that the terms and expressions used herein have the ordinary meaning as is accorded to such terms and expressions with respect to their corresponding respective areas of inquiry and study except where specific meanings have otherwise been set forth herein.
DETAILED DESCRIPTION
Approaches are described herein that provide a tool that reads identification information from the vehicle (typically via dash VIN reading/recognition or via barcode scan in the door jamb, but other methods are possible) and automatically determines the type(s) of tire pressure sensor low frequency (LF) trigger, radio frequency (RF) protocol, or other possible method to trigger the TPMS sensors mounted on the vehicle, in addition to the recommended cold pressures (RCP) for the vehicle tires. Responsively, information is received from the vehicle including tire pressure information such that the valve caps do not have to be removed. Consequently, better tire pressure control, increased productivity and a reduction in potential for erroneous records by the technician performing the tire service work, increased safety for drivers renting the vehicles, potentially decreased liability of the rental agencies, and improved vehicle maintenance history are all provided.
Based upon the captured vehicle information via the VIN, etc., reading, one or more tire pressure sensor activation/trigger methods are determined. The determined one or more tire pressure sensor activation/trigger methods are then used to activate the sensors without further input from the tire pressure check tool user. The sensors are then triggered one-at-a-time via the tire sidewall with the described handheld tire pressure check tool (typically in an outdoor car return collection lot), or multiples could also be simultaneously triggered in a more shop type environment (such as a reconditioning shop “assembly line”) via the described handheld tool or perhaps in combination with hardwired LF triggers in the shop, but other methods are possible. Tire pressure information is responsively received from the activated tire pressure monitoring (TPM) sensors.
In some aspects, the tire pressure information is presented to a user via, a screen on the tool. In other aspects, a determination is made as to whether the tire pressure information falls below a predetermined first threshold or above a predetermined second threshold. In still other aspects, the information is transmitted to a central location such as a rental agency office. More detailed vehicle information could also be retrieved by the tool via the VIN and TPM sensors as will later be outlined.
In other of these embodiments, a portable tool that is configured to obtain data from a TPM sensor includes an interface and a controller. The interface has an input and an output. Alternatively, the tool could also be hardwired in the garage or outdoor service facility to trigger the vehicle TPM sensors automatically upon being driven through an LF trigger field.
The controller is coupled to the interface and is configured to request vehicle identification information at the output and responsively receive the requested vehicle identification information from a vehicle at the input. The controller is further configured to, based upon the received vehicle information, determine one or more tire pressure sensing approaches or parameters. The controller is configured to use the determined one or more tire pressure sensing approaches or parameters to activate a plurality of tire pressure monitoring (TPM) sensors at the vehicle via the output. The controller is further configured to responsively receive tire pressure information at the input from the activated TPM sensors.
Referring now to FIG. 1, a tool and system are described. A technician uses a tool 102 to scan a first tire 104, a second tire 106, a third tire 108, and a fourth tire 110 on a vehicle 101. The first tire 104 has an associated first TPM sensor (or monitor or wheel unit) 112; the second tire 106 has an associated second TPM sensor 114; the third tire 108 has an associated third TPM sensor 116; and the fourth tire 110 has an associated TPM sensor 118. Although the approaches described herein have particular applicability in a vehicle rental agency environment for rental agency applications, it will be understood that these approaches are not limited to this particular environment and may, in fact, be used in any appropriate environment or location such as maintenance or repair facilities, garages, toll facilities, truck weigh stations, or car dealers.
The sensors 112, 114, 116, and 118 communicate with a receiver 120. The communication between the TPMS monitors 112, 114, 116, and 118 and the receiver 120 is accomplished in one aspect via wireless, radio frequency (RF) links, but other methods are possible.
The TPMS monitors 112, 114, 116, and 118 may include processing devices and memories and execute computer instructions to sense and transmit tire pressure (or other) data. In these regards, the TPMS monitors 112, 114, 116, and 118 may themselves include structures, devices, or apparatus that actually sense the pressure (or other types of data) in the tires 104, 106, 108 and 110.
The receiver 120 includes hardware and/or software to receive (and in some examples transmit) information from the TPMS monitors 112, 114, 116, and 118. The receiver 120 is disposed at an appropriate location within the vehicle 101.
Since the maintenance technician has to perform the task to check the air pressure every time a vehicle is returned and has to complete a check list, it is typically more efficient (e.g., in terms of cost, time, accuracy of data and so forth) to offer per rental agency the tool 102 which reads the VIN 122 of the vehicle 101. The VIN 122 (or other vehicle identification information) of the vehicle 101 can be read by any appropriate approach. The tool 102 then determines which kind or type of LF protocol, Recommended Cold Pressures (RCPs) (which could be different pressures between front and rear tires if the vehicle has a split placard configuration from the OEM), and/or the appropriate RF protocol to be used to trigger the TPM sensors 112, 114, 116, and 118 (note that 4 sensors are only used here as a typical example, but more or less sensors are possible) mounted on the vehicle 101. The tool 102 triggers each sensor 112, 114, 116, and 118 on the vehicle, records and displays the pressure for each tire on the said vehicle including their location (e.g., left front, right front, left rear, and right rear). The display may be made according to a display screen on the tool 102.
The LF approach may relate to different LF transmission frequencies that are used to wake up the TPM sensor 112, 114, 116, and 118. The LF approach is typically different for different automobile manufacturers. The RF transmission protocol may relate to the data format or baud rate (to mention two examples) used to transmit information from the TPM sensors 112, 114, 116, and 118. The RF transmission protocol is typically different for different automobile manufacturers.
This information (e.g., tire pressure and location) obtained from the TPM sensors can be used by the rental agency to manage tire rotation history, if the sensors are embedded in the tire or otherwise somehow married to the tire. It can also be of particular benefit for vehicles with a split placard (i.e., pressure in the tires is different for front tires and rear) to ensure proper pressures for both front and rear tires. Other information that could be displayed/connected for traceability and record keeping is the associated VIN, the date, and the time of the day the check was performed. This information could provide a clear history of the vehicle tire maintenance. Also, the technician's name that performed the check can also be displayed.
All the data could be recorded in a database either in the tool, printed on a built-in or separate printer, or transmitted (e.g., via a wireless local area network (WLAN), via Bluetooth, or via some other wired or wireless connection) to another location (e.g., a docketing station within the rental agency office).
The tool 102 could also indicate to the user that the tire is properly inflated via color coding with a green light or other symbol or on a small screen in the vehicle 101. In this case, the tool is automatically comparing known RCPs or other information against the test samples that were just recorded, and as such, the technician does not need to remove the cap and inflate or deflate the tire (time and money saved). If the tire is underinflated or over inflated, a yellow (minimal difference) light or red (significant difference) light or other symbols could be lit on the tool 102 or at some other location. A small screen on the tool 102 or some other location (e.g., a central location such as the headquarters of the rental agency) could also display the current pressure with the RCP of the vehicle or by how much air pressure (e.g., as measured in psi, and so forth) the tire needs to be deflated or inflated.
For vehicles that are returned without time for the tires to cool down before the technician performs a tire check, the tool 102 could be equipped with a simple temperature sensor that would automatically compensate the received tire pressure temperature with air temperature inside the tire (received) and the external ambient temperature. The operator could be offered this option or the tool could be equipped with an integrated thermometer tip that automatically makes this adjustment without further involvement by the operator.
In order to simplify the tool and to reduce tool costs and tool updates, each agency could choose from the tool supplier cataloging the applicable model, brand, and model year of the vehicles in the fleet (cost of tool could be linked to required vehicle coverage). Tools could also capture the embedded in the tire radio frequency identification (RFID) chip data. With this extended data, the rental agencies could keep track of the age of the tires on a specific vehicle, verify that the original tires weren't stolen off the vehicle (happens often with rental fleets), tire maintenance schedule, tire/vehicle compatibility (regarding load ratings, and so forth), tire recall history, and so forth.
The tool could also have a Bluetooth connection or via any wireless connections to the vehicle. Upon a button press on the vehicle internet protocol (IP), the latest received TPM data by the TPM receiver of the said vehicle could be transferred directly to the tool.
Consequently, better tire pressure control, increased productivity of the technician performing the work, increased safety for drivers renting the vehicles, potentially decreased liability of the rental agencies, and improved vehicle maintenance history are all provided.
Referring now to FIG. 2, one example of an approach for using a pressure check tool is described. At step 202 and at a portable tool, vehicle identification information is requested from a vehicle and responsively received from the vehicle. At step 204 and based upon the vehicle information, one or more tire pressure sensing approaches or parameters are determined. In some examples, the one or more tire pressure sensing approaches or parameters include a low frequency (LF) protocol and a radio frequency (RF) protocol. Other examples are possible. In other examples, the vehicle identification information comprises a vehicle identification number (VIN). Other examples are possible.
At step 206, the determined one or more tire pressure sensor trigger signals are used to activate singularly or activate a plurality of tire pressure monitoring (TPM) sensors at the vehicle. At step 208, tire pressure information is responsively received from the activated TPM sensors.
In some aspects, the tire pressure information is presented to a user via a screen on the portable tool. In other aspects, a determination is made as to whether the tire pressure information falls below a predetermined first threshold or above a predetermined second threshold. In still other aspects, the information is transmitted to a central location such as a rental agency office.
Referring now to FIG. 3, a portable tool 300 that is configured to obtain data from a tire pressure monitoring (TPM) sensor includes an interface 302 and a controller 304. The interface 302 has an input 306 and an output 308. A memory 309 may be used to store the various types of information as well as the computer instructions used to execute or implement the approaches described herein. The memory 309 may also include tables or other data structures that provide mappings between vehicle identification information and the different tire pressure sensor triggers and parameters used herein. For example, a particular VIN may be associated with a particular LF sensor trigger and a particular RF transmission protocol. Alternatively, the vehicle identification information may be communicated to a central location and the central location may return to the tool the appropriate tire pressure sensing approaches or parameters to use. Such communication may be accomplished using a wireless link for example.
The controller 304 is coupled to the interface 302 and is configured to transmit a request 305 for vehicle identification information 310 at the output 308 and responsively receive the requested vehicle identification information 310 from a vehicle at the input 306. The controller 304 is further configured to, based upon the vehicle information 310, determine one or more tire pressure sensor triggers or parameters. The controller 304 is configured to use the determined one or more tire pressure sensor triggers or parameters to activate singularly or a plurality of tire pressure monitoring (TPM) sensors at the vehicle via the output 308. The controller 304 is further configured to responsively receive tire pressure information 312 at the input 306 from the activated TPM sensors.
It should be understood that any of the devices described herein (e.g., the tools, the controllers, the receivers, the transmitters, the sensors, any presentation or display devices, or the external devices) may use a computing device to implement various functionality and operation of these devices. In terms of hardware architecture, such a computing device can include but is not limited to a processor, a memory, and one or more input and/or output (I/O) device interface(s) that are communicatively coupled via a local interface. The local interface can include, for example but not limited to, one or more buses and/or other wired or wireless connections. The processor may be a hardware device for executing software, particularly software stored in memory. The processor can be a custom made or commercially available processor, a central processing unit (CPU), an auxiliary processor among several processors associated with the computing device, a semiconductor based microprocessor (in the form of a microchip or chip set) or generally any device for executing software instructions.
The memory devices described herein can include any one or combination of volatile memory elements (e.g., random access memory (RAM), such as dynamic RAM (DRAM), static RAM (SRAM), synchronous dynamic RAM (SDRAM), video RAM (VRAM), and so forth)) and/or nonvolatile memory elements (e.g., read only memory (ROM), hard drive, tape, CD-ROM, and so forth). Moreover, the memory may incorporate electronic, magnetic, optical, and/or other types of storage media. The memory can also have a distributed architecture, where various components are situated remotely from one another, but can be accessed by the processor.
The software in any of the memory devices described herein may include one or more separate programs, each of which includes an ordered listing of executable instructions for implementing the functions described herein. When constructed as a source program, the program is translated via a compiler, assembler, interpreter, or the like, which may or may not be included within the memory.
It will be appreciated that any of the approaches described herein can be implemented at least in part as computer instructions stored on a computer media (e.g., a computer memory as described above) and these instructions can be executed on a processing device such as a microprocessor. However, these approaches can be implemented as any combination of electronic hardware and/or software.
Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. It should be understood that the illustrated embodiments are exemplary only, and should not be taken as limiting the scope of the invention.

## Claims

1. A method for obtaining data from a tire pressure monitoring (TPM) sensor, the TPM sensor disposed at a vehicle wheel, the vehicle having a receiver disposed therein, the receiver being physically separate from the TPM sensor, comprising:
at a portable tool:
requesting and receiving vehicle identification information from a label affixed or attached to a vehicle;
based upon the vehicle identification information, determining one or more tire pressure sensor activation/trigger protocols and one or more Recommended Cold Pressures, the protocols effective to wake the TPM sensor from a sleep state to an active state;
using the determined one or more tire pressure sensor activation/trigger protocols to activate one or more tire pressure monitoring (TPM) sensors at the vehicle;
responsively receiving tire pressure information from the activated TPM sensors;
determining by a controller of the portable tool whether the tire pressure information falls below any of the one or more of the Recommended Cold Pressures;
wherein the tool interacts exclusively with the tire pressure monitor sensor and not the receiver of the vehicle.

2. The method of claim 1 further comprising presenting the tire pressure information to a user via a screen on the portable tool.

3. The method of claim 1 further comprises transmitting the information to a central location.

4. The method of claim 1 wherein the one or more tire pressure sensor activation/trigger protocols are selected from the group consisting of: a low frequency (LF) protocol and a radio frequency (RF) protocol.

5. The method of claim 1 wherein the vehicle identification information comprises a vehicle identification number (VIN).

6. A portable tool that is configured to obtain data from a tire pressure monitoring (TPM) sensor, the TPM sensor disposed at a vehicle wheel, the vehicle having a receiver disposed therein, the receiver being physically separate from the TPM sensor, comprising:
an interface having an input and an output;
a controller coupled to the interface, the controller configured to request vehicle identification information at the output and responsively receive the requested vehicle identification information from a label affixed or attached to a vehicle at the input, the controller configured to, based upon the vehicle identification information, determine one or more tire pressure sensor activation/trigger protocols and one or more Recommended Cold Pressures, the protocols effective to wake the TPM sensor from a sleep state to an active state, the controller configured to use the determined one or more tire pressure sensor activation/trigger protocols to activate one or more tire pressure monitoring (TPM) sensors at the vehicle via the output, the controller configured to responsively receive tire pressure information at the input from the activated TPM sensors, the controller configured to determine whether the tire pressure information falls below any of the one or more of the Recommended Cold Pressures;
wherein the tool interacts exclusively with the tire pressure monitor sensor and not the receiver of the vehicle.

7. The tool of claim 6 further comprising a screen and wherein the controller is configured to present the tire pressure information to a user via the screen on the portable tool.

8. The tool of claim 6 wherein the controller is configured to transmit the information to a central location via the output.

9. The tool of claim 6 wherein the one or more tire pressure sensor activation/trigger protocols are selected from the group consisting of: a low frequency (LF) protocol and a radio frequency (RF) protocol.

10. The tool of claim 6 wherein the vehicle identification information comprises a vehicle identification number (VIN).

11. A computer usable non-transitory medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method of obtaining data from a tire pressure monitoring (TPM) sensor, the TPM sensor disposed at a vehicle wheel, the vehicle having a receiver disposed therein, the receiver being physically separate from the TPM sensor, the method comprising:
at a portable tool:
requesting and receiving vehicle identification information from a label affixed or attached to a vehicle;
based upon the vehicle identification information, determining one or more tire pressure sensor activation/trigger protocols and one or more Recommended Cold Pressures;
using the determined one or more tire pressure sensor activation/trigger protocols to activate one or more tire pressure monitoring (TPM) sensors at the vehicle, the protocols effective to wake the TPM sensor from a sleep state to an active state;
responsively receiving tire pressure information from the activated TPM sensors;
determining by a controller of the portable tool whether the tire pressure information falls below any of the one or more of the Recommended Cold Pressures;
wherein the tool interacts exclusively with the tire pressure monitor sensor and not the receiver of the vehicle.

12. The medium of claim 11 further comprising presenting the tire pressure information to a user via a screen on the portable tool.

13. The medium of claim 11 further comprises transmitting the information to a central location.

14. The medium of claim 11 wherein the one or more tire pressure sensor activation/trigger protocols are selected from the group consisting of a low frequency (LF) protocol and a radio frequency (RF) protocol.

15. The medium of claim 11 wherein the vehicle identification information comprises a vehicle identification number (VIN).