Patent Application
20230286487
This disclosure relates to work equipment, and more specifically to a brake pack for a work machine.
Work machines can be used at construction sites and other off-road locations. Such work machines can include haulers, compactors, pavers, and the like. Some work machines utilize a brake pack to provide stopping for the machine.
One issue that can arise when using a work machine is the wear and tear on the brake pack. Over time the brake packs in machines need to be replaced. Manufacturers have instruction for testing brake pack capability by parking a machine on a hill to test the brake pack but this is just a go/no go test without any specificity.
U.S. Pat. No. 10,773,702 discusses a method of determining brake wear on a vehicle by consideration of the wear of the brake pad every time the brake is actuated based on speed change parameter. The wear of each braking event is accumulated, and the remaining brake life or next expected replacement time is estimated.
In an example according to this disclosure, a work machine can include a frame; a plurality of transportation devices attached to the frame; an engine to provide a propel pressure to the plurality of transportation devices; a brake pack associated with one or more of the plurality of transportation devices; and a controller configured to perform a brake pack test by receiving the propel pressure and a machine speed and wherein the controller determines a brake pack life remaining based on the propel pressure of the machine when the machine speed rises above zero.
In another example, a method of testing a brake pack of a work machine can include applying a brake pack; increasing a propel pressure to the work machine; and determining a brake pack life remaining based on the propel pressure at a time a speed of the work machine goes above zero.
In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. Like numerals having different letter suffixes may represent different instances of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed in the present document.
The machine 100 can include an engine 122 for providing propel power to the wheels 120 and being supported by the frame 110.
Further, the work machine 100 can include one or more brake packs 130 associated with one or more of the plurality of wheels 120. For example, in one embodiment, a single brake pack 130 can be used for the front wheels 120 and one brake pack 130 can be used for the back wheels 120. In one embodiment, each wheel 120 of the work machine 100 can include a separate brake pack 130. The brake pack 130 uses hydraulic pressure and physical mechanisms to slow down and stop the wheels from rotating. The brake pack 130 can include a spring applied, hydraulically released brake pack.
As discussed above, one issue that can arise when using the work machine 100 is wear and tear on the brake pack 130. A given brake pack 130 has a given life expectancy depending on usage. Over time the brake packs in machines wear and need to be replaced. Manufacturers have instruction for testing brake pack capability by parking a machine on a hill but this is just a pass/fail test without specificity.
In the present system, the system can calculate the remaining life of a brake pack and advise if service is needed. For example, the work machine 100 can include a controller 150 that can be operably coupled to the engine 122, the brake packs 130 and the other components of the work machine 100.
In one embodiment, the controller 150 can be configured to perform a brake pack test on the brake packs 130. For example, with the brakes applied, the engine 122 can begin to try to propel the wheels 120. The controller 150 can receive the propel pressure being applied to the wheels 120. The work machine 100 can also include one or more speed sensors 152 operably coupled to the wheels 120 to determine a speed of the wheels 120. The wheel speed from the sensors 152 can also be relayed to the controller 150. From the propel pressure information and the wheel speed information the controller 150 can be configured to determine the brake pack life remaining.
For example, when the wheel speed rises above zero (e.g., when the propel pressure overcomes the brakes and the wheels begin to turn), the controller 150 can determine the brake pack life remaining based on the propel pressure at that moment. The brake pack life remaining means the useful, functional life of the brake pack. When the work machine 100 moves, the controller 150 knows that the braking limit of the current state of the brake pack 130 has been reached and then in terms of the propel pressure, the specific work machine 100 and the specific brake pack 130 being tested, the controller 150 can develop an estimate of brake pack life remaining. The propel pressure needed to overcome the brakes will go down over the life of the brake pack 130. Based on empirical data and work site usage, a reliable estimate of the brake pack life remaining can be developed over time.
In one embodiment, the brake pack life remaining can be shown as a percentage of total brake pack life. Based on the percentage, the operator can determine if maintenance, repair, or replacement is needed for the specific brake pack 130.
In one example, the work machine 100 can include an angle sensor 154 coupled to the controller 150. The angle that the work machine 100 is positioned on can then also be used by the controller 150 to help determine brake pack life remaining.
In one example, the controller 150 can keep track of the number of times the brake pack has been used. The controller 150 can then use the number of prior stops performed by the brake pack 130 to help determine the brake pack life remaining.
As noted, the brake pack life remaining can be defined as a percentage of brake pack life remaining based on the overall brake pack life. For example, the overall brake pack life can be determined based on the specific work machine and the manufacturer's suggested brake life, and also can be based on empirical evidence, actual usage statistics, etc. Thus, over time, the system can accumulate data based on the specific machine and the specific brake pack and thus will know that if work machine X has a brake pack Y, then a brake pack test propel speed of Z means the brake pack has a specific percentage of life remaining. As noted, in general, as the propel pressure to overcome the brakes goes down, then brake pack life remaining is less.
In one example, the percentage can be displayed to an operator of the work machine on an operator's display 156. In some examples, the percentage of brake pack life remaining can be sent to a remote location for analysis.
The brake pack test discussed herein can be performed at different time intervals. For example, the brake pack test can occur at the machine operator's discretion. For example, the operator can be instructed to perform the brake pack test daily, weekly, or monthly.
In one example, the brake pack test can occur automatically each time the work machine 100 is powered on. This can be advantageous if the work machine 100 is an autonomous machine, where at start-up, the work machine 100 is put through various start-up tests including a brake pack life test.
In summary, once in test mode, the brakes are applied and the work machine uses its propel system to try and drive through the brake pack to determine how well the brakes are working. The propel pressure can be measured to calculate how much force it took to overpower the brakes. This force can then be correlated to a brake pack life remaining by knowing when the machine started to move (and what angle the machine was at during the test, etc.). The brake pack life value could be displayed to the operator or sent via the cloud to schedule maintenance.
The present system is applicable during many situations in road construction. Again, the brake pack life test can be utilized by an articulated truck, a compactor, a paver, haul truck, an autonomous machine, and the like.
As discussed above, the method (200) can further include determining an angle of the work machine and also using the machine angle to determine the brake pack life remaining. The method (200) can also include determining a number of prior stops performed by the brake pack to determine the brake pack life remaining.
Again, the brake pack life remaining can be defined as a percentage of the brake pack life remaining. The percentage can be displayed to the operator of the work machine or sent to a remote location. In some examples, the method can further include advising whether brake pack service is required based on the brake pack test.
Accordingly, the present system is related to the field of brake pack life detecting mechanisms in compactors, pavers, haul trucks, autonomous machines, and the like. According to the present system, a feature is provided which notifies an operator if service is needed based on calculated remaining brake life. An electronic chip module (ECM) controller can be configured to detect the machine propel pressure, the machine wheel speed, and other factors such machine angle and number of prior brake stops. The controller calculates remaining brake life based on the detected values and notifies an operator if service is needed based on the calculated remaining brake life. This system can also be a useful safety check for autonomous machines.
Various examples are illustrated in the figures and foregoing description. One or more features from one or more of these examples may be combined to form other examples.
The above detailed description is intended to be illustrative, and not restrictive. The scope of the disclosure should, therefore, be determined with references to the appended claims, along with the full scope of equivalents to which such claims are entitled.
