Abstract:
A fluid exchange machine for removing used transmission fluid from a vehicle&#39;s cooling system and replacing the used fluid with fresh fluid includes a fresh fluid tank, a used fluid tank, a pump for forcing fresh fluid from the fresh fluid tank to a vehicle&#39;s cooling system, a processor for controlling a fluid exchange operation, and a display coupled to said processor for graphically representing a status of the fluid exchange operation. The display can be an LCD display or other display capable of graphical representation of the conditions and status of the fluid exchange operation.

Description:
BACKGROUND 
     Automatic transmissions and other vehicular fluid system components frequently require servicing such as replacing used fluid with fresh fluid in order to properly maintain them and extend the life of the component and associated vehicle. Early attempts at developing automatic transmission fluid transfer machines often resulted in relatively lengthy and complicated procedures. Many of these early devices required significant manual operation and supervision as the operator had to continually monitor gauges and other instruments to monitor the fluid flow to achieve the desired performance. 
     Recently there have been numerous advances in the field of fluid exchange machines. U.S. Pat. No. 7,111,650 to Few, assigned to the assignee of the present application, discloses a radiator fluid exchanging apparatus that includes a fresh fluid supply tank, and used fluid supply tank, pumps, and fluid lines for exchanging the old fluid and replacing it with new transmission fluid. The &#39;650 Patent is fully incorporated herein by reference. The general mechanics of replacing fluid in a transmission is well known in the art and is substantially set forth in the cited reference, and a discussion of the plumbing of the fluid exchange machine is unnecessary to the understanding of the present invention. Only the details of the operation of the machine necessary for an understanding of the present invention is provided here. 
     Many of the prior art fluid exchange machines were satisfactory for efficiently replacing the transmission fluid. However, those using the machines on a daily basis constantly look to ways to automate the procedure and make the operation more streamline. For example, a processor was added to these machines to control the fluid exchange operation, monitoring the pumps and fluid levels to promote a fluid exchange where the fluid added to the system was approximately equal to the fluid taken from the system. This is important when the fluid exchange occurs while the vehicle engine is running, ensuring that adequate cooling fluid is present at all times and that the engine will not overheat. While many of these devices have also proven satisfactory in their performance there remains a need for the operator to have more control over the fluid exchange operation and to be able to control the operation to a higher degree than prior machines. The ability to control the fluid exchange relies on the user having as much information as possible in an easy to understand manner. The present invention is an advance in vehicle fluid exchange machines that incorporates greater feedback from the machine in a textual or graphical output, and thus allows the user to have more control over the fluid exchange operation. 
     SUMMARY OF THE INVENTION 
     The present invention is a transmission fluid exchange machine that includes a new fluid tank, a used fluid tank, a pump for pumping new fluid into a vehicle&#39;s transmission system, and a processor for regulating the fluid exchange operation. The present invention further comprises a control panel with a graphical display that provides real-time graphical status updates on the progress of the fluid exchange operation and the status of the fluid exchange machine. The graphical status updates includes amount of new fluid introduced, amount of used fluid extracted, textual instructions for carrying out the fluid exchange operation, and other features and options of the machine. In a preferred embodiment, the machine also includes a memory that stores the information related to the progress of the fluid exchange in a ROM or persistent data memory that retains the information in the event of a loss of power, enabling the machine to return to the point in the fluid exchange machine and continue the fluid exchange after power is returned to the machine. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an elevated, perspective view, partially exposing an interior of the housing, of a first preferred embodiment of the present invention; 
         FIG. 2   a  is a schematic of manifold diagram of the embodiment of  FIG. 1 ; 
         FIG. 2   b  is a schematic of a flow diagram of the embodiment of  FIG. 1 ; 
         FIG. 3  is an enlarged, front view of the display panel of the embodiment of  FIG. 1 ; 
         FIGS. 4-12  are display screen shots of information relayed from the machine to the operator using the display panel of  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention is a fluid exchange machine that is adapted to add fresh transmission fluid to a vehicle and withdraw used transmission fluid from the vehicle, and incorporates a display that provides textual and graphical feedback as to the status and options of the machine&#39;s operation.  FIG. 1  shows a machine  10  for carrying out the objects of the invention including a housing  20  supported on casters or wheels  15  for rolling the machine into position next to a vehicle&#39;s engine (not shown). The housing  20  is made of a durable plastic, metal, or other material that will resist corrosion in the presence of automotive fluids while providing a lightweight body that can easily be wheeled around the garage or work station. The housing  20  encloses two fluid tanks as is known in the art, a used fluid container  25  into which old fluid in the vehicle&#39;s transmission is pumped during the fluid exchange operation, and a new fluid tank  35  supply of fresh fluid to be pumped into the vehicle&#39;s transmission. The pumping of the old fluid and the replenishing of the new fluid preferably occurs sequentially, although other known methods for replacing the fluid include simultaneous fluid exchange is also known in the art. An evacuation hose  22  and a fill hose  24  are provided that connect the two tanks, and the machine can include a variety of adapter fittings  27  to accommodate different types and makes of vehicle transmissions. The machine also includes a control panel  200  and a microprocessor  19  that control the operation of the machine and the display  210  described in more detail below. 
       FIG. 2   a  is a schematic of a manifold diagram for the fluid exchange machine  10 . The used fluid tank  25  is connected to outlet  60  of manifold  100  and the new fluid tank  35  is connected to inlet  65 . A dual direction solenoid  55  controls the direction of the flow into and out of the tanks, where the solenoid is connected to a microprocessor  19  within the housing  20  below the control panel. Pump  45  is preferably a reversible pump that can pump both incoming and outgoing fluid, so fluid is first pumped from the vehicle&#39;s transmission through the manifold at entrance  80 , filter  70 , and through a solenoid  75  and out outlet  60  to the used fluid tank  25 . New fluid from the new fluid tank  35  is then pumped into the vehicle&#39;s system through inlet  65  and solenoid  55 , across relief valve  50  and out through exit  85 . Pressure switch  40  regulates the flow in the manifold  100 . Exit  90  is part of an alternate flow path that feeds fluid to the transmission dipstick rather than on a port on the transmission. In  FIG. 2   b , manifold  100  is connected to used fluid tank  25  and new fluid tank  35  by respective conduits. New fluid line  24  carries new fluid from manifold  100  to the vehicle&#39;s transmission at a connection with a port  105  on the transmission (not shown), and used fluid line  22  returns used fluid from a port  110  on the transmission to the manifold  100 . Alternate fluid exchange passage line  115  introduces fluid from the manifold  100  to the vehicle&#39;s transmission dipstick  120  in place of the fluid line  24 . 
     The control panel  200  is shown in  FIG. 3  and includes a display screen  210  such as a liquid crystal display (LCD) or light emitting diode (LED) display for creating graphical images to be relayed to the user. A keypad  220  is provided to allow the user to enter information into a microprocessor (not shown) located below the control panel  200 . The microprocessor is connected to the display screen  210  to drive the display and provide information set forth in more detail below. The control panel  200  is also preferably provided with written instructions for initiating the start-up sequence and any hazard warnings or operational information needed prior to activation of the display screen  210 . 
     The display screen  210  provides the user with a wealth of information on the status and progress of the fluid exchange operation, including exemplary screens shown in  FIGS. 4-12 . Once the machine&#39;s power has been activated, a start-up screen such as that shown in  FIG. 4  is displayed to the user. Start-up screen includes a listing of two types of fluid exchanges, an inline fluid exchange (1) and a dipstick fluid exchange (2). The inline fluid exchange uses hose  24  to direct new transmission fluid directly into the vehicle&#39;s transmission whereas the dipstick fluid exchange delivers new fluid through the transmission&#39;s dipstick port. The start-up screen also includes a “menu” option (0) for accessing a main menu. The user can use the keypad  220  to enter the appropriate number and select the fluid exchange option or access the main menu. 
     The screen  210  then displays a graphical representation of the used fluid tank level and the new fluid tank level, or a graphical representation of the respective amounts of fluid to be added and subtracted from the vehicle&#39;s transmission. For example, in  FIG. 5  a new fluid bar  240  and a used fluid bar  250  are shown along with a numerical value of units of fluid to be exchanged, which can be adjusted with the arrow keys on the keypad  220 . The display screen in  FIG. 5  shows “11” quarts of fluid to be exchanged, but the adjacent arrows signify to the user that the value can be increased or decreased with the keypad. Once the “ENTER” key on the keypad is depressed, a new screen such as  FIG. 6  confirms the eleven quart fluid exchange and that the type of exchange is an “INLINE” exchange, and instructs the user to start the vehicle&#39;s engine. Once the “START” button is pressed, the screen switches to that shown in  FIG. 7 , which shows the status of the fluid exchange in graphical form. For example, a new fluid bar may increase from zero to eleven quarts while the used fluid bar similarly increases from zero to eleven quarts as the status “RUNNING” is displayed. The screen display of  FIG. 7  is constantly updated throughout the fluid exchange operation to convey to the user exactly what the status and progress of the fluid exchange in real time. A textual message instructs the user to “PRESS STOP TO PAUSE” the operation if it should be necessary to temporarily halt the fluid exchange. If the stop button is depressed, a screen such as that shown in  FIG. 9  shows the word “PAUSED” overlaid over the status screen to indicate that the fluid exchange operation has been temporarily halted by the user. The screen of  FIG. 9  also instructs the user to depress the “START” button to resume the fluid exchange operation. 
     Once the fluid exchange is complete, a screen such as that shown in  FIG. 8  shows the amount of new fluid added (“11”) and the amount of used fluid extracted (“11”), as well as status bars graphically depicting the result of the fluid exchange. The work “COMPLETE” is displayed to signify that the fluid exchange operation has terminated successfully. At this point, the user can inspect the fluid dipstick in the transmission to check the level of the fluid, and add or extract fluid to adjust the level. In  FIG. 10 , a sample screen shows that the screen can also extract 0.2 quarts of fluid incrementally from the transmission to bring down the fluid level. Fluid could also be added in intervals such as 0.2 quarts, although different quantities and different units of measurements (liters, etc.) could also be displayed without departing from the scope of the invention. Once the 0.2 quarts of fluid is successfully extracted, the screen can display a message such as that shown in  FIG. 11  indicating that the fluid removal is completed. The main menu (0) is depicted in  FIG. 12 , which provides the user with the option of an inline or dipstick exchange operation, and to add or remove fluid from the vehicle&#39;s transmission system. The machine also offers a priming operation that can be selected from the main menu by entering the number “5” on the keypad. More instructions and options can be accessed from the main menu by depressing the down arrow key on the keypad. 
     A second improvement on the machine is the addition of a ROM or data persistent memory to the processor to allow the processor to acquire and keep data pertaining to the fluid exchange operation that will not be lost in the event of a power outage or unexpected disruption of power to the machine. The use of the data persistent memory retains the resident data, which is preferably updated by the microprocessor continuously during the fluid exchange operation. In the event of a sudden or unexpected power outage, the processor initially looks to the data persistent memory to determine if the most recent fluid exchange operation was successfully completed or interrupted. If it was interrupted, the microprocessor causes the display  210  to ask the user if the user wants to continue with the previous fluid exchange operation. If so indicated, the memory restores the conditions to the most recently saved data and continues with the fluid exchange operation without further input from the user. This option can save the user a significant amount of time in the event of a power interruption, where the machine simply continues as if no interruption had occurred. 
     The present invention is an improvement over prior art fluid exchange machines that use flashing indicator lights to convey the status of a fluid exchange operation. The LCD or other screen type allows graphical representations of the fluid exchange operation, providing the user with more information in a more easily viewed format. The machine also can resume operation after a power interruption without the loss of data using a memory associated with the microprocessor that uses a data persistent memory. 
     The foregoing descriptions are intended to be exemplary but not limiting in the scope of the present invention. It is anticipated that one of ordinary skill in the art, for example, would readily conceive of variations and modifications to the above-referenced disclosure while keeping with the scope of the present invention, and the present invention is intended to include all such variations and modifications. Accordingly, the scope of the invention should be measured by the words of the appended claims, using the common and ordinary usage of the words in the claims, and should not be limited in any manner to any particular described embodiment or method herein.