Diesel emission control system

Abstract

A diesel exhaust fluid control system includes a first DEF tank and a second DEF tank. A pump pumps fluid from one or more of the first DEF tank and the second DEF tank. A connection line fluidly connects the first DEF tank and the second DEF tank. A heating system prevents DEF from freezing in the diesel exhaust fluid control system.

Description

[0001] Cross-reference to related applications

[0002] This application was filed as a PCT international application on February 29, 2024, and claims the benefit and priority of U.S. Provisional Patent Application No. 63 / 611,610, filed on December 18, 2023, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0003] Diesel Exhaust Fluid (DEF) is a key component required to meet diesel engine emission standards and is mandated by regulations in many countries. The use of DEF helps reduce harmful emissions and improve air quality, while also enhancing the performance and lifespan of diesel engines.

[0004] DEF is a solution of purified water and urea used to reduce nitrogen oxide (NOx) emissions from diesel engines. When DEF is injected into the exhaust stream of a diesel engine, it reacts with the NOx in the exhaust gases and converts it into harmless nitrogen and water vapor.

[0005] Most diesel engine manufacturers are required to use DEF to comply with emissions regulations, particularly in the United States and Europe. The most widely recognized emissions regulations are the Environmental Protection Agency's (EPA) Tier 4 Final Standard and the European Union's (EU) Stage V Standard.

[0006] Under these regulations, all new diesel engines must meet stringent emission standards, which necessitates the use of DEF injection technology. The amount of DEF used depends on the engine size and emissions output, but typically ranges from 2% to 5% of diesel fuel consumption.

[0007] EPA and EU regulations also stipulate that DEF must meet certain quality standards. DEF must be a 32.5% urea solution and must be free of impurities (such as dust, metal particles, and other contaminants). DEF is typically stored in a separate tank on the vehicle or equipment and must be replenished periodically based on usage. Under EPA regulations, DEF tanks cannot be refilled more frequently than fuel tanks. Summary of the Invention

[0008] In summary, the present invention relates to a diesel emission control system. In some examples, the concepts described herein with reference to the diesel emission control system can be implemented to increase the on-board DEF carrying capacity of the DEF reservoir of the unit on which the diesel emission control system is included. Furthermore, depending on the location where the diesel emission control system is used, environmental conditions may cause the DEF included in the diesel emission control system to freeze. The concepts described herein with reference to the diesel emission control system can be implemented to prevent DEF freezing within the DEF reservoir of the diesel emission control system. In some examples, the concepts described herein can be further implemented to thaw frozen DEF within the DEF reservoir.

[0009] In some embodiments, and by way of non-limiting example, the generator includes a diesel emission control system. The diesel emission control system includes an on-board reservoir. The on-board reservoir includes a first DEF tank and a second DEF tank. The first DEF tank is fluidly connected to the second DEF tank via a connecting line. The diesel emission control system also includes an inlet fluidly connected to the first DEF tank via a first tank inlet line and fluidly connected to the second DEF tank via a second tank inlet line. The diesel emission control system also includes a pump fluidly connected to at least one of the first DEF tank and the second DEF tank. The diesel emission control system also includes a heating system including an engine coolant supply line, an engine coolant return line, a first tank heating assembly, and a second tank heating assembly.

[0010] In other embodiments, and by way of non-limiting example, the diesel emission control system includes a reservoir comprising a first DEF tank and a second DEF tank. The first DEF tank and the second DEF tank are fluidly connected. The diesel emission control system also includes an inlet connected to each of the first DEF tank and the second DEF tank, the inlet including a single fill port. The diesel emission control system also includes a pump fluidly connected to at least one of the first DEF tank and the second DEF tank. The pump is configured to pump DEF from at least one of the first DEF tank and the second DEF tank. The diesel emission control system also includes a heating system comprising a first tank heating coil assembly and a second tank heating coil assembly.

[0011] In other embodiments, and by way of non-limiting example, the DEF storage system includes a reservoir comprising a first DEF tank and a second DEF tank. The first DEF tank is fluidly connected to the second DEF tank via a connecting line. The connecting line provides equalization of the DEF levels in the first DEF tank and the second DEF tank. The DEF storage system includes an inlet connected to at least one of the first DEF tanks. The DEF storage system also includes a pump connected to at least one of the first DEF tank and the second DEF tank. The pump is configured to pump DEF from both the first DEF tank and the second DEF tank. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of an example diesel emission control system.

[0013] Figure 2 This is a perspective view of an example mobile diesel generator.

[0014] Figure 3 This is a perspective view of the example DEF storage system.

[0015] Figure 4 yes Figure 3 An exploded perspective view of the DEF storage system.

[0016] Figure 5 yes Figure 3 A perspective view of the first tank of an example DEF storage system.

[0017] Figure 6 yes Figure 3 A perspective view of an example connection pipeline for a DEF storage system.

[0018] Figure 7 yes Figure 3 An exploded view of the connecting pipelines.

[0019] Figure 8 yes Figure 3 A perspective view of an example entry point for a DEF storage system.

[0020] Figure 9 yes Figure 8 The exploded view of the entrance.

[0021] Figure 10 yes Figure 3 A perspective view of an example DEF pumping system for a DEF storage system.

[0022] Figure 11 yes Figure 3 A perspective view of an example heating system for a DEF storage system.

[0023] Figure 12 yes Figure 11 An example of a heating system, a perspective view of the second tank heating assembly.

[0024] Figure 13 yes Figure 11 An example of a heating system: a perspective view of the first tank heating assembly.

[0025] Figure 14 This is a schematic diagram of an example heating system for a DEF storage system. Detailed Implementation

[0026] Various embodiments will be described in detail with reference to the accompanying drawings, wherein the same reference numerals denote the same parts and components throughout the views. Reference to the various embodiments is not limited to the scope of the appended claims. Furthermore, any examples set forth in this specification are not intended to be limiting, and merely illustrate some of the many possible embodiments of the appended claims.

[0027] Figure 1 This is a schematic diagram of an example diesel emission control system 100. (As shown...) Figure 1 As shown, the diesel emission control system 100 includes a housing 102, an engine 104, a battery 106, a pump 107, an engine controller 108, a generator controller 110, an on-board DEF reservoir 111, a housing passage 116, a clean emission module 120, a DEF filling line 122, a pump inlet line 125, and an engine DEF supply line 126. Although Figure 1 The vehicle-mounted DEF reservoir 111 is illustrated as including two DEF tanks 112 and 113, but in some examples, the vehicle-mounted DEF reservoir 111 includes more than two DEF tanks.

[0028] like Figure 1 As shown in the example, housing 102 houses engine 104, battery 106, engine controller 108, generator controller 110, clean emissions module 120, DEF reservoir 111, DEF fill line 122, pump inlet line 125, and engine DEF supply line 126. Figure 1 In the example, the housing channel 116 is formed within the wall of the housing 102.

[0029] Engine 104 includes a diesel engine. In some examples, clean emissions module 120 includes an aftertreatment system. In some examples, clean emissions module 120 includes a DEF emissions module configured to deliver DEF to the emissions system of engine 104.

[0030] Battery 106 is connected to the engine (specifically the engine emission module) via electrical connections. In some examples, battery 106 is a single 24V DC battery. In other examples, the battery comprises multiple 24V DC batteries. In some examples, battery 106 comprises one or more 12V DC batteries (such as, for example, two 12V DC batteries connected in series to a total of 24V DC).

[0031] Engine controller 108 is connected to battery 106 via electrical connections. Engine controller 108 reads values ​​from sensors, interprets the data from said sensors, and transmits signals to other parts of diesel emission control system 100. In some examples, engine controller 108 is electrically connected to generator controller 110, engine 104, and pump 107, sending signals to them and / or receiving signals from them. Figure 1 In the example illustrated, engine controller 108 sends a signal to pump 107, which pumps DEF from DEF reservoir 111 to clean emissions module 120. In some examples, both engine controller 108 and generator controller 110 are provided. In other examples, generator controller 110 is not included in diesel emission control system 100.

[0032] In some examples, pump 107 draws DEF from reservoir 111 via pump inlet line 125. In some examples, pump 107 delivers DEF to clean emission module 120 via engine DEF supply line 126.

[0033] Figure 2 This is an example of a mobile diesel generator 200, wherein the example mobile diesel generator 200 includes a diesel emission control system, such as, for example... Figure 1 The diesel emission control system 100. In some examples, it can be... Figure 1 The diesel emission control system 100 is installed in other devices, such as, for example, road vehicles, off-road vehicles, agricultural and construction vehicles, commercial and industrial equipment, or marine vessels. Figure 2 In the example, the mobile diesel generator 200 includes a housing (not shown), an engine 204, a battery 206, a control unit 208, and a DEF storage system 300.

[0034] In some examples, engine 204 is configured to be substantially similar to engine 104, and battery 206 is configured to be substantially similar to battery 106. In some examples, control section 208 includes an engine controller and a generator controller, which are configured to be substantially similar to... Figure 1 The engine controller 108 and the generator controller 110.

[0035] Figure 3 This is a perspective view of the example DEF storage system 300. Figure 4 yes Figure 3 An exploded view of a DEF storage system 300. In some examples, the DEF storage system 300 is used within a mobile diesel generator 200. The DEF storage system 300 includes a reservoir section 302, an inlet 304, a heating system 306, and a DEF pumping system 308. In some examples, the inlet 304 is configured to allow the use of DEF to fill the reservoir section 302. The heating system 306 is arranged in and around the reservoir section 302 and is configured to maintain the reservoir section 302 at a temperature appropriate for the DEF storage within the reservoir section 302. The DEF pumping system 308 pumps DEF from the reservoir section 302 to a clean emission module, such as a reference module. Figure 1 The clean emission module 120 described herein delivers DEF to the engine 204 of the mobile diesel generator 200.

[0036] In some examples, the storage unit 302 includes a first tank 312, a second tank 314, and a connecting line 315. In some examples, the first tank 312 and the second tank 314 are identical. In some examples, when the first tank 312 and the second tank 314 are arranged within the DEF storage system 300, the first tank 312 and the second tank 314 are installed side by side. In some examples, the connecting line 315 is fluidly connected to both the first tank 312 and the second tank 314.

[0037] Figure 5 This is a perspective view of an exemplary can (such as, for example, an exemplary second can 314) of the DEF storage system 300. The second can 314 includes a top side 313, a bottom side 316, a front side 318, and a rear side 320. In some examples, the second can also include a DEF inlet port 322, a first auxiliary port 324, a second auxiliary port 326, a mounting trench 328, and a DEF equalization port 329.

[0038] In some examples, the DEF inlet port 322 is located on the top side of tank 314 and provides a sealable inlet through which DEF can flow into tank 314. In some examples, the DEF inlet port is connected to... Figure 3 The entry point 304 allows DEF to flow through the entry point 304 and enter the DEF entry port 322.

[0039] In some examples, a first auxiliary port 324 is located on the top side 313 of the tank 314. In some examples, a second auxiliary port 326 is also located on the top side 313 of the tank 314. In some examples, the tank 314 includes more or fewer thermal ports. In some examples, the thermal ports provide access points for a heating system 306 to be inserted into the tank 314 to control the temperature of the DEF located therein.

[0040] The mounting groove 328 is located on the top side 313 of the tank 314, and in some examples (such as...) Figure 5 In some examples, the mounting groove 328 also extends along the side surface of the DEF tank. In some examples, the mounting groove 328 is a recess and / or channel in the surface of the tank 314, where a retaining strap can be arranged to secure the tank 314 to a mobile diesel generator (such as, for example, Figure 2 The surface inside the mobile diesel generator 200.

[0041] DEF equalization port 329 extends through the surface of can 314 to allow access to the interior of can 314. In some examples, DEF equalization port 329 is arranged on the front side 318 of can 314, at a portion of the front side 318 adjacent to the bottom side 316 of can 314.

[0042] Figure 6 This is a perspective view of the connecting line 315 and portions of the first tank 312 and the second tank 314. The connecting line 315 includes a first end 368, a second end 370, and a discharge port 372. The connecting line 315 is typically configured to allow DEF to flow between the first tank 312 and the second tank 314. In some examples, the connecting line 315 allows the DEF fill level in the first tank 312 to be equalized with the DEF fill level in the second tank 314.

[0043] A first end 368 of the connecting line 315 is connected to the DEF equalization port 329 of the first tank 312, and a second end 370 of the connecting line 315 is connected to the DEF equalization port 329 of the second tank 314. In some examples, the connecting line 315 is arranged substantially horizontally relative to the first tank 312 and the second tank 314, and the connecting line 315 extends between the first tank 312 and the second tank 314.

[0044] In some examples, the discharge port 372 is located along the length of the connecting line 315 between the first end 368 and the second end 370 of the connecting line 315. In some examples, the discharge port allows DEF to be discharged from the first tank 312 and the second tank 314 when a component of the DEF storage system 300 needs to be repaired or replaced. In some examples, the discharge port 372 is selectively openable, allowing DEF to flow through the connecting line 315 while the DEF storage system 300 is operating, while the discharge port 372 is sealed.

[0045] In some examples, such as Figure 6 As shown, when the first can 312 and the second can 314 are arranged within the DEF storage system 300, the first can 312 and the second can 314 are arranged at the same height relative to each other. In this example, the bottom sides 316 of the first can 312 and the second can 314 are substantially coplanar.

[0046] Figure 7 This is an exploded view of connecting pipe 315. In some examples, such as... Figure 7 As shown, the connecting line 315 includes a conduit portion 382 and a heating portion 384. In some examples, the conduit portion 382 comprises a hose material such as rubber, EPDM rubber, or silicone. In other examples, the conduit portion 382 comprises a tube material such as aluminum, steel, or PVC. When DEF flows within the connecting line 315, the conduit portion 382 contacts the DEF.

[0047] In some examples, such as in Figure 7 In some examples, the heating portion 384 includes a heating coil 386 and an insulating portion 388. In some examples, the heating portion 384 surrounds the conduit portion 382 of the connecting conduit 315. In some examples, the heating coil 386 surrounds and contacts the conduit portion 382, ​​and the insulating portion 388 surrounds and contacts the heating coil 386. In some examples, the heating portion 384 is arranged along the length of the conduit portion 382, ​​and the heating portion 384 extends between a first end 368 and a second end 370 of the connecting conduit 315. In some examples, the heating portion 384 is used to heat the conduit portion 382 such that the DEF within the connecting conduit 315 is maintained at a temperature above the DEF freezing point (e.g., above 12℉). In some examples, the heating portion 384 is used to heat the conduit portion 382 to melt the DEF that has frozen within the connecting conduit 315. In some examples, the heating portion 384 extends along a portion of the length of the conduit portion 382. In other examples, the heating portion 384 extends along the entire length of the conduit portion 382.

[0048] In some examples, the heating coil 386 includes, for example, an electric heat tracing cable or a silicone rubber heating strip. In some examples, the heating coil 386 is a 30W 24V DC spiral-wound heater. In some examples, the heating coil 386 is wound around the circumference of the conduit portion 382 along its length.

[0049] In some examples, the heating coil 386 also includes an electrical harness 374 that supplies power from an electric power source to the heating coil 386 and controls the heat output of the heating coil 386. In some examples, the electrical harness 374 is provided with a constant power supply from the electric power source. In some examples, the electrical harness 374 also includes a thermal switch 387, such as a thermostat thermal switch. In some examples, the thermal switch 387 monitors the temperature of the environment in which the DEF storage system 300 is located. In other examples, the thermal switch 387 monitors the temperature of the DEF in the connecting conduit 315. In some examples, the thermal switch 387 is configured to be in a closed position if the monitored temperature is below a lower threshold, and in an open position if the monitored temperature is above an upper threshold. In some examples, the lower threshold is equal to the upper threshold. In some examples, when the electrical harness 374 is in the closed position, the electrical harness 374 delivers power from the electric power source to the heating coil 386, which causes the heating coil 386 to generate heat and heat the connecting line 215.

[0050] In some examples, the lower threshold is approximately 40℉ ± approximately 9℉ (e.g., 40℉ ± 9℉). In some examples, the upper threshold is approximately 60℉ ± approximately 5℉ (e.g., 60℉ ± 5℉). In some examples, each of the upper and lower thresholds is greater than approximately 12℉ and less than approximately 86℉.

[0051] In other examples, electrical harness 374 is connected to a controller. In some examples, the controller transmits electrical signals by fusing the harness. In other examples, the controller transmits electrical signals to a relay that controls the power supply from electrical harness 374 to heating coil 386. (Reference) Figure 14 The example in the document describes this connection and control process in more detail.

[0052] In some examples, such as Figure 7In one example, the insulation portion 388 is formed from several separate segments of insulating material. In this example, the insulation portion 388 includes a first portion 373 extending between a first end 368 of the connecting conduit 315 and a discharge port 372, and the second portion 375 extending between a second end 370 and a discharge port 372. In some examples, the insulation portion 388 is arranged such that when the heating coil 386 is wound around the conduit portion 382, ​​the insulation portion 388 completely surrounds the heating coil 386. In some examples, the insulation portion 388 comprises, for example, polyurethane foam, polyethylene foam, polystyrene foam, fiberglass tube insulator, phenolic foam, silicone foam, aerogel insulator, mineral wool insulator, ceramic fiber insulator, or rubber foam insulator.

[0053] In some examples, heating the connecting line 315 is advantageous because it prevents DEF from freezing, thus allowing DEF to flow freely between the first tank 312 and the second tank 314. In some examples, the heated connecting line 315 allows DEF to flow freely even when the DEF storage system 300 is used in an environment below the freezing point of DEF. In some examples, the free flow of DEF between the first tank 312 and the second tank 314 allows the DEF level in the first tank 312 to be equalized with the DEF level in the second tank 314. Therefore, the total volume of DEF in both the first tank 312 and the second tank 314 can be drawn from a single tank.

[0054] Although the heating section 384 is described above as including heating cables, in some alternative examples, the heating section 384 includes, for example, an insulating heating bushing, a steam tracing system, an insulating pipe bushing with a heater, a pipe heating blanket, a heat-shrinkable sleeve, one or more infrared heating lamps, or a hot water or glycerin circulation system (such as a coolant line). In some examples, the heating section 384 connecting to the line 315 is included as a component of the heating system 306.

[0055] Figure 8 This is a perspective view of entry point 304 of the DEF storage system 300. Figure 8In one example, inlet 304 includes a housing mounting portion 330, a main inlet line 334, a Y-connector 336, a first tank inlet line 338, and a second tank inlet line 340. In some examples, the housing mounting portion 330, the main inlet line 334, the Y-connector 336, the first tank inlet line 338, and the second tank inlet line 340 are all fluidly connected to each other. In some examples, the housing mounting portion 330 is connected to the main inlet line 334. The main inlet line 334 is connected to the Y-connector 336. The Y-connector 336 is connected to the first tank inlet line 338 and the second tank inlet line 340. The first tank inlet line 338 is connected to the first tank 312. And the second tank inlet line 340 is connected to the second tank 314.

[0056] In some examples, inlet 304 is configured to receive DEF from the outside of the mobile diesel generator and deliver the DEF to the first tank 312 and the second tank 314. In some examples, inlet 304 delivers substantially equal amounts of DEF to each of the first tank 312 and the second tank 314. In some such examples, inlet 304 delivers slightly larger amounts of DEF to the first tank 312 and the second tank 314. In some examples, DEF flows from the housing mounting portion through the main inlet line 334, where it is diverted by the Y-connector 336 to the first tank inlet line 338 and the second tank inlet line 340, through which it flows into the first tank 312 and the second tank 314, respectively. In some examples, the housing mounting portion 330 is connected to the main inlet line 334 at a point above the point where the main inlet line 334 connects to the Y-connector 336. This arrangement allows DEF to flow from the housing mounting portion 330 to the Y-connector 336. Similarly, in some examples, each of the first can inlet line 338 and the second can inlet line 340 is connected to the Y-connector 336 at a point above where the first can inlet line 338 and the second can inlet line 340 are respectively connected to the first can 312 and the second can 314, so that DEF flows from the Y-connector 336 into the first can 312 and the second can 314.

[0057] Figure 9 yes Figure 8 An exploded view of inlet 304 of the diesel emission system. As described above, inlet 304 includes a housing mounting portion 330, a main inlet line 334, a Y-connector 336, a first tank inlet line 338, and a second tank inlet line 340. In some examples, inlet 304 includes a single fill port through which DEF can be simultaneously added to the first tank 312 and the second tank 314.

[0058] The housing mounting portion 330 connects the inlet 304 to the housing of the mobile diesel generator, and includes access points through which DEF can be added to the first tank 312 and the second tank 314 of the DEF storage system 300. In some examples, the housing mounting portion 330 includes a mounting gasket 331, a mounting flange 333, and a cover 335. In some examples, the mounting gasket 331 is secured to a side wall of the mobile diesel generator housing. The mounting flange 333 is secured to the side wall of the mobile diesel generator and extends into the housing through openings in the side wall and in the mounting gasket 331, at which point the mounting flange 333 connects to the end of the main inlet line 334. In some examples, the mounting flange 333 is secured above the mounting gasket 331. In some examples, the mounting flange 333 and the mounting gasket 331 are connected to the housing side wall using fasteners that extend through holes arranged in each of the mounting gasket 331 and the mounting flange 333. In some examples, the mounting flange 333 is connected to the main inlet line 334 using hose clamps, threads, adhesive, fasteners, or other connections that allow fluid to flow from the housing mounting portion 330 into the main inlet line 334. A cover 335 is releasably connected to the mounting flange 333 and is configured to seal the inlet 304 from the environment outside the housing of the mobile diesel generator 200.

[0059] The main inlet line 334 includes a first end 342 and a second end 344. The main inlet line 334 delivers DEF from the housing mounting portion 330 to the Y-connector 336. In some examples, the first end 342 of the main inlet line 334 is connected to the mounting flange 333 of the housing mounting portion 330, and the second end 344 of the main inlet line 334 is connected to the inlet of the Y-connector 336. In some examples, the main inlet line 334 is formed as a substantially linear tube; in other examples, the main inlet line 334 includes one or more bends along its length. Figure 9 In the example, the main inlet line 334 includes a bend of approximately 45° adjacent to the first end 342 of the main inlet line 334.

[0060] Y-connector 336 includes a Y-shaped inlet 348, a first can outlet 350, and a second can outlet 352. Y-connector 336 is configured to split the DEF flow of a primary inlet line 334 between a first can 312 and a second can 314. In some examples, Y-connector 336 is formed as a tee-Y mating member. Y-connector 336 is attached to the primary inlet line 334 at the Y-shaped inlet 348, to the first can outlet 350 at the first can outlet 350, and to the second can outlet 352 at the second can outlet 352. In some examples, the primary inlet line 334 is fluidly connected to the first can inlet line 338 and the second can inlet line 340 via Y-connector 336. In some examples, Y-connector 336 includes one or more bends along its length. For example, in... Figure 9 In the example, the Y-shaped connector 336 includes a 90° bend adjacent to the Y-shaped inlet 348.

[0061] The first can inlet line 338 includes a first end 354 and a second end 356. The first can inlet line 338 connects at the first end 354 to the first can output 350 of the Y-connector 336, and at the second end 356 to the DEF inlet port 322 of the first can 312. In some examples, similar to the main inlet line 334, the first can inlet line 338 is formed as a substantially linear tube; in other examples, the first can inlet line 338 includes one or more bends along its length. Figure 9 In the example, the first tank inlet line 338 includes a 90° elbow bend adjacent to the second end 356 of the first tank inlet line 338.

[0062] The second can inlet line 340 includes a first end 362 and a second end 364. In some examples, the second can inlet line 340 also includes a sleeve 366. The second can inlet line 340 connects at the first end 362 to the second can output 352 of the Y-connector 336 and at the second end 364 to the DEF inlet port 322 of the second can 314. In some examples, similar to the first can inlet line 338, the second can inlet line 340 is formed as a substantially linear tube; in other examples, the second can inlet line 340 includes one or more bends along its length. Figure 9 In the example, the second tank inlet line 340 includes a 90° elbow bend adjacent to the second end 364 of the second tank inlet line 340.

[0063] In some examples, using inlet 304 to fill the first can 312 and the second can 314 is advantageous because it allows both cans 312 and 314 to be filled simultaneously through the DEF inlet 322. This allows the user to fill the first can 312 and the second can 314 more quickly because the user does not need to wait for DEF to flow from either the first can 312 or the second can 314 through the connecting line 315, such as when only one of the first can 312 or the second can 314 is being filled through the DEF inlet port 322.

[0064] Figure 10 This is a perspective view of the DEF pumping system 308 of the DEF storage system 300. The DEF pumping system 308 includes a pump 392 (which includes a pump output 397), a pump inlet line 394, and a pump output line (not shown). In some examples, the DEF pumping system 308 also includes a first tank return line 395.

[0065] In some examples, the first end of the pump inlet line 394 is inserted into the interior of the first tank 312 via a second auxiliary port 326. In some examples, the pump inlet line 394 is connected at its second end to the inlet of the pump 392. In some examples, the pump 392 is mounted to the first tank 312 and is adapted to draw DEF from the first tank 312 via the pump inlet line 394. In some examples, the pump 392 is also adapted to discharge DEF from the pump outlet 397 via a pump outlet line to a clean emission module in communication with the engine. In some examples, the pump 392 includes, for example, a diaphragm pump or a centrifugal pump.

[0066] In some examples, pump 392 can be configured to pump DEF from various components of DEF pumping system 308 back to first tank 312 via first tank return line 395.

[0067] In some examples, the DEF storage system 300 includes only one pump for pumping DEF from the storage section 302 to the engine 204. In some examples, DEF is pumped from only a single tank (such as, for example, the first tank 312). However, as DEF is pumped from the first tank and the DEF level in the first tank 312 decreases, DEF flows from the second tank 314 into the first tank 312 via connecting line 315, such that the DEF level in the first tank 312 is equal to the DEF level in the second tank 314. In some examples, the rate at which DEF is pumped from the first tank 312 is lower than the rate at which DEF can flow from the second tank 314 into the first tank 312 via connecting line 315. For example, in some examples, the rate at which DEF is pumped from the first tank 312 is approximately one gallon per hour, and the rate at which DEF flows from the second tank 314 into the first tank 312 via connecting line 315 is greater than approximately one gallon per hour.

[0068] In other examples, the DEF storage system 300 includes more than one pump for pumping DEF, such that each of the first tank 312 and the second tank 314 is equipped with a pump.

[0069] Figure 11 This is a perspective view of the heating system 306 of the DEF storage system 300. The heating system 306 includes an engine coolant supply line 402, an engine coolant return line 404, a first tank heating assembly 406, and a second tank heating assembly 408. In some examples, by using the heating system 306, the DEF in the first tank 312 and the second tank 314 can be maintained at a temperature above the freezing point of the DEF, so that even when the DEF storage system 300 is placed in an environment with a temperature below the freezing point of the DEF, the DEF remains liquid and can still be delivered to the engine. In some examples, the heating system 306 of the DEF storage system 300 can heat the DEF in the DEF storage system 300 while the engine is running. In some examples, heating system 306 is able to heat DEF in DEF storage system 300 to thaw DEF in first canister 312 and second canister 314 after they have frozen in DEF storage system 300. This may be the case when DEF storage system 300 is in a cold environment for an extended period of time while the engine is not running.

[0070] In some examples, the heating system 306 is activated by supplying engine coolant from the engine through engine coolant supply line 402 to the first tank heating assembly 406 and the second tank heating assembly 408, and then supplying engine coolant from the heating system 306 back to the engine via engine coolant return line 404.

[0071] In some examples, the engine coolant supply line 402 includes a main supply line 410, a supply T-fit 412, a first can supply line 414, and a second can supply line 416. In some examples, the main supply line 410 delivers engine coolant from the engine to the supply T-fit 412. Once the coolant is delivered to the supply T-fit 412, it is branched between the first can supply line 414 and the second can supply line 416, with the engine coolant being delivered through the first can supply line 414 and the second can supply line 416 to the first can heating assembly 406 and the second can heating assembly 408.

[0072] In some examples, the engine coolant return line 404 includes a main return line 418, a return T-fit 420, a first tank return line 422, and a second tank return line 424. In some examples, once engine coolant leaves the first tank heating assembly 406 and the second tank heating assembly 408, the engine coolant is supplied to the first tank return line 422 and the second tank return line 424, respectively. Each of the first tank return line 422 and the second tank return line 424 is connected to the return T-fit 420 and delivers engine coolant to the return T-fit 420. Engine coolant from the first tank return line 422 and the second tank return line 424 flows through the return T-fit into the main return line 418, through which the engine coolant flows back to the engine.

[0073] Figure 12 This is a detailed view of the second tank heating assembly 408. In some examples, the second tank heating assembly 408 includes a reversing valve 425, a coil supply line 426, a first coil 428, a coil connection line 430, and a second coil 432. In some examples, each of the reversing valve 425, the coil supply line 426, the first coil 428, the coil connection line 430, and the second coil is fluidly connected. In some examples, the second tank supply line 416 is connected to the reversing valve 425b. The reversing valve 425b is connected to the coil supply line 426. The coil supply line 426 is connected to the first coil 428, which is connected to the coil connection line 430. The coil connection line 430 is connected to the second coil 432. And the second coil 432 is connected to the second tank return line 424.

[0074] In some examples, after engine coolant is delivered to the second tank heating assembly 408 via the second tank supply line 416, the coolant reaches the reversing valve 425b of the second tank heating assembly 408. In some examples, the reversing valve 425b is adjustable between an open position and a closed position, in which coolant is allowed to flow into the second tank heating assembly 408 through the reversing valve 425b, and in the closed position, coolant is restricted from flowing into the second tank heating assembly through the reversing valve 425b. In some examples, as referenced... Figure 14 As explained in more detail in the embodiments described herein, the reversing valve 425b receives a signal that causes it to adjust between an open and closed position. When the reversing valve 425b is in the open position, coolant flows through the reversing valve 425b into the coil supply line 426. After flowing through the coil supply line 426, the coolant enters and flows through the first coil 428. After flowing through the first coil 428, the coolant flows through the coil connection line 430 and into the second coil 432. In some examples, once the coolant flows out of the second coil 432, the coil flows into the second tank return line 424.

[0075] In some examples, each of the first coil 428 and the second coil 432 is mounted to the top side 313 of the second tank 314. The first coil 428 extends through the first auxiliary port 324 into the interior of the second tank 314, and the second coil 432 extends through the second auxiliary port 326 into the interior of the second tank 314. In some examples, each of the first coil 428 and the second coil 432 is formed as a curved section of a conduit containing a material with thermal conductivity, such as, for example, aluminum, aluminum alloy, brazed aluminum, copper, or a copper-nickel alloy. In some examples, each of the first coil 428 and / or the second coil 432 includes a DEF manifold assembly, such as one of the DEF manifold assemblies manufactured, for example, by Perkins Engines Company Limited. In some examples, as coolant flows through the first coil 428 and the second coil 432, heat from the coolant is transferred via the heat conduction first coil 428 and the second coil 432 to the DEF inside the second tank 314. In some examples, a greater number of coils may be used within the second tank 314. In other examples, a single coil may be used within the second tank 314.

[0076] Figure 13 This is a detailed view of the first tank heating assembly 406.

[0077] In some examples, the first tank heating assembly 406 is configured substantially similar to the second tank heating assembly 408, such that the first tank heating assembly 406 includes each of the same components described with reference to the second tank heating assembly 408, and the first tank heating assembly 406 functions substantially similarly to the second tank heating assembly 408. In some examples, the first tank heating assembly 406 differs from the second tank heating assembly 408 in that the first tank cooling reversing valve 425a of the first tank heating assembly 406 is connected to the first tank supply line 414, and the second coil 432 of the first tank heating assembly 406 is connected to the first tank return line 422.

[0078] In other examples, the first can heating assembly 406 differs from the second can heating assembly 408 in that the first can heating assembly 406 also includes a pump heating line 427. In some examples, the pump heating line 427 is connected at a first end to a second coil 432 of the first can heating assembly 406 and at a second end to a pump 392. In some examples, the pump heating line 427 delivers coolant from the second coil 432 to the pump 392 to regulate the temperature of the DEF in the pump 392. In some examples, a first can return line 422 is connected to the pump 392 such that coolant leaves the pump 392 via the first can return line 422, through which coolant is delivered to the return T-fit 420.

[0079] Figure 14 This is an example schematic diagram of a heating system 506 for a diesel generator 500. In some examples, the heating system 506 is substantially similar to the example heating system 306. Figure 14 In some examples, heating system 506 includes engine controller 501, generator controller 503, first tank heating assembly 505, second tank heating assembly 508, engine 504, coolant pump 507, and radiator 509. In some examples, heating system 506 is configured to regulate the temperature of DEF in first tank 512 and second tank 514. In some examples, first tank 512 and second tank 514 are substantially similar to reference [reference]. Figures 3 to 13 The first can 312 and the second can 314 are described.

[0080] In some examples, the first can heating assembly 505 is configured substantially similar to the first can heating assembly 406. In some examples, the first can heating assembly 505 includes a first can temperature sensor 527, a first can heating coil assembly 528, and a first can coolant reversing valve 525a. In some examples, the second can heating assembly 508 is configured substantially similar to the second can heating assembly 408. In some examples, the second can heating assembly 508 includes a second can coolant reversing valve 525b and a second can heating coil assembly 530. In some examples, each of the first can heating coil assembly 528 and the second can heating coil assembly 530 includes one or more heating coils arranged respectively within the first can 512 and the second can 514.

[0081] In some examples, a first canister temperature sensor 527 is configured to monitor the temperature of the DEF within a first canister 512. The first canister temperature sensor 527 provides a signal to the engine controller 501 corresponding to the measured temperature. In some examples, the measured temperature of the first canister 512 is used to infer the temperature of the second canister 514. In other examples, the second canister heating assembly 508 may also include a second canister temperature sensor configured to monitor the temperature of the DEF within the second canister 514. In some examples, using the first canister temperature sensor 527 to infer the temperature of the second canister 514 is advantageous because it allows for the use of fewer sensors and components (thus minimizing cost and complexity) while still providing an accurate estimate of the temperature of the second canister 514. In some examples, using the first canister temperature sensor 527 to infer the temperature of the second canister 514 may also be advantageous because it allows for the estimation of the second canister's temperature without the need for wiring another electrical connection between the engine controller 501 and the second canister temperature sensor.

[0082] Engine controller 501 is configured to monitor a signal generated by first tank temperature sensor 537. In some examples, the engine controller is also configured to monitor a second tank temperature sensor. In some examples, if a signal generated by first tank temperature sensor 527 indicates that the DEF temperature is below a lower threshold, engine controller 501 is configured to generate a signal to initiate DEF heating. In some examples, if a signal generated by second tank temperature sensor indicates that the DEF temperature is below a threshold, engine controller 501 is configured to generate a signal to initiate DEF heating.

[0083] In some examples, the lower threshold is approximately 40℉ ± approximately 9℉ (e.g., 40℉ ± 9℉). In some examples, the lower threshold is greater than approximately 12℉ and less than approximately 86℉.

[0084] In some examples, the signal from engine controller 501 to initiate heating of the DEF includes a command to adjust the position of the first coolant reversing valve 525a to the open position. In some examples, the signal from engine controller 501 to initiate heating of the DEF includes a command to adjust the position of the second coolant reversing valve 525b to the open position.

[0085] In some examples, the generator controller 503 monitors signals generated by the engine controller 501, such as a signal to initiate heating of the DEF. In this example, when the generator controller 503 detects that the engine controller 501 has transmitted a signal to initiate heating of the DEF, the generator controller 503 transmits a corresponding signal to initiate heating of the DEF. In some examples, the signal issued by the generator controller 503 to initiate heating of the DEF includes a command to adjust the position of the second coolant reversing valve 525b to the open position. In some examples, it is advantageous to use the generator controller 503 to monitor signals generated by the engine controller 501 and generate a corresponding signal to open the second coolant reversing valve 525b because it allows adjustment of the second coolant reversing valve 525b without having to directly electrically connect the second coolant reversing valve 525b to the engine controller 501.

[0086] In some examples, the diesel generator 500 includes an engine cooling circuit 511, which includes a coolant path through the radiator 509 of the diesel generator 500, a coolant pump 507, and an engine 504. In some examples, in the engine cooling circuit 511, coolant is pumped by the coolant pump 507 and directed through the engine 504. As the coolant passes through the engine 504, it functions as a radiator to cool the engine 504. This causes the coolant temperature to rise. In some examples, after the coolant passes through the engine and is heated by the engine, it is directed to the radiator 509. As the coolant passes through the radiator 509, it is cooled back down before finally being directed back to the coolant pump 507.

[0087] In some examples, when the first coolant reversing valve 525a and the second coolant reversing valve 525b are in the closed position, coolant is continuously guided through the engine cooling circuit 511. In other examples, when the first coolant reversing valve 525a and the second coolant reversing valve 525b are in the open position, coolant flows from the engine cooling circuit 511 through the first can heating assembly 505 and the second can heating assembly 508 to increase the temperature of the DEF in the first can 512 and the second can 514, after which the coolant flows back into the engine cooling circuit 511. Specifically, in some examples, when the first coolant reversing valve 525a and the second coolant reversing valve 525b are in the open position, engine-heated coolant is pumped from the engine cooling circuit 511 to the first coolant reversing valve 525a and the second coolant reversing valve 525b. Coolant flows from first coolant reversing valve 525a and second coolant reversing valve 525b to first coolant heating coil assembly 528 and second coolant heating coil assembly 530, respectively. Once in first coolant heating coil assembly 528 and second coolant heating coil assembly 530, the coolant heats DEF in first can 512 and second can 514, respectively. Then, coolant flows from first coolant heating coil assembly 528 and second coolant heating coil assembly 530 back to engine cooling circuit 511. In some examples, coolant pump 507 drives coolant from engine cooling circuit 511 through the rest of heating system 506.

[0088] In some examples, the first tank temperature sensor 527 is configured to continuously monitor the DEF temperature within the first tank 512 while coolant is pumped through the first tank heating coil assembly 528. In some examples, the second tank temperature sensor is configured to monitor the DEF temperature within the second tank 514.

[0089] In some examples, engine controller 501 is configured to monitor a signal generated by a first canister temperature sensor 537. In some examples, the engine controller is also configured to monitor a second canister temperature sensor. In some examples, if a signal generated by the first canister temperature sensor 527 indicates that the DEF temperature is greater than an upper limit threshold, engine controller 501 is configured to generate a signal to stop heating the DEF. In some examples, if a signal generated by the second canister temperature sensor indicates that the DEF temperature is greater than an upper limit threshold, engine controller 501 is configured to generate a signal to stop heating the DEF.

[0090] In some examples, the upper limit threshold is approximately 60℉ ± approximately 5℉ (e.g., 60℉ ± 5℉). In some examples, the upper limit threshold is greater than approximately 12℉ and less than approximately 86℉.

[0091] In some examples, the signal sent by engine controller 501 to stop heating of the DEF includes a command to adjust the position of the first coolant reversing valve 525a to the closed position. In some examples, the signal sent by engine controller 501 to stop heating of the DEF includes a command to adjust the position of the second coolant reversing valve 525b to the closed position.

[0092] In some examples, the generator controller 503 monitors signals generated by the engine controller 501, such as a signal to stop heating the DEF. In this example, when the generator controller 503 detects that the engine controller 501 has transmitted a signal to stop heating the DEF, the generator controller 503 transmits a corresponding signal to stop heating the DEF. In some examples, the signal from the generator controller 503 to stop heating the DEF includes a command to adjust the position of the second coolant reversing valve 525b to the closed position.

[0093] In some examples, once the first coolant reversing valve 525a and the second coolant reversing valve 525b are in the closed position, the coolant is directed through the engine cooling circuit 511 and cut off to prevent it from entering the first coolant heating assembly 505 or the second coolant heating assembly 508.

[0094] In some examples, engine controller 501 operates to control the first coolant reversing valve 525a, and generator controller 503 reads temperature data from engine controller 501. In some examples, generator controller 503 reads temperature data from engine controller 501 via CAN communication. In some examples, generator controller 503 operates to control the second coolant reversing valve 525b based on the value of the temperature data.

[0095] In some examples, a heating coil 586 for the connecting line between the first tank 512 and the second tank 514 is also included within the heating system 506. In some examples, the heating coil 586 is substantially similar to the referenced above. Figure 7 The heating coil 386 is described.

[0096] In other examples, refer to the above. Figure 7 Unlike the described heating coil 386, heating coil 586 is electrically connected to one or more of engine controller 501 or generator controller 503. In some examples, the electrical connection is provided by an electrical wiring harness (such as the one referenced above). Figure 7 The electrical harness 374 described is provided.

[0097] In some examples, engine controller 501 or generator controller 503 transmits an electrical signal to a switch within the electrical harness, which allows power to be delivered to heating coil 586. In some examples, the electrical signal is generated when a DEF temperature sensor (such as first tank temperature sensor 527) senses that the DEF temperature is below a lower threshold.

[0098] In some examples, engine controller 501 or generator controller 503 transmits an electrical signal to the switch, which causes power to be stopped from being supplied to heating coil 586. In some examples, the electrical signal is generated when a DEF temperature sensor (such as first tank temperature sensor 527) senses that the temperature of the DEF is above an upper limit threshold.

[0099] In some examples, the lower threshold is approximately 40℉ ± approximately 9℉ (e.g., 40℉ ± 9℉). In some examples, the upper threshold is approximately 60℉ ± approximately 5℉ (e.g., 60℉ ± 5℉). In some examples, each of the upper and lower thresholds is greater than approximately 12℉ and less than approximately 86℉.

[0100] In some examples, using the concepts presented in this disclosure allows for increasing the amount of DEF carried within the vehicle and emission control system (such as an emission control system including a DEF storage system 300) by using two on-board DEF tanks instead of a single on-board DEF tank. This allows the diesel emission control system to operate for a longer period of time without requiring the operator to refill the on-board DEF tank. In some examples, the concepts presented herein can be used to add a greater number of on-board DEF tanks to the DEF storage system, such as, for example, three, four, five, or more DEF tanks. In some examples, the concepts of this disclosure can be used to convert a DEF storage system using a single on-board DEF tank to include a greater number of on-board DEF tanks.

[0101] In some examples, the use of a DEF storage system 300 with a first tank 312 and a second tank 314 within a diesel generator (such as a mobile diesel generator 200) allows the generator to operate for at least 24 hours before the storage section 302 needs to be refilled.

[0102] This disclosure should be understood to include (as illustrative and not restrictive) the subject matter set forth in the following numbered clauses:

[0103] Clause 1: A generator comprising:

[0104] Diesel emission control system, the diesel emission control system comprising:

[0105] An on-board storage device, the on-board storage device including a first DEF tank and a second DEF tank, the first DEF tank being fluidly connected to the second DEF tank via a connecting line;

[0106] The inlet is fluidly connected to the first DEF tank via a first tank inlet line and fluidly connected to the second DEF tank via a second tank inlet line;

[0107] A pump, the pump being fluidly connected to at least one of the first DEF tank and the second DEF tank; and

[0108] A heating system, the heating system comprising an engine coolant supply line, an engine coolant return line, a first heating element, and a second heating element.

[0109] Clause 2: The generator as described in Clause 1, wherein each of the first tank heating assembly and the second tank heating assembly includes a heating coil.

[0110] Clause 3: The generator as described in any one of Clauses 1 to 2, wherein the diesel emission control system further includes an engine and a coolant pump, the coolant pump being used to pump engine coolant from the engine through the engine coolant supply line, the first tank heating assembly, the second tank heating assembly, and the engine coolant return line.

[0111] Clause 4: A generator as described in any one of Clauses 1 to 3, wherein the generator is configured to operate for at least 24 hours before resupplying DEF to the on-board storage.

[0112] Clause 5: The generator as described in any one of Clauses 1 to 4, wherein the inlet further includes a main inlet line fluidly connected to the first tank inlet line and the second tank inlet line.

[0113] Clause 6: The generator as described in any one of Clauses 1 to 5, wherein the inlet further includes a single filling port through which DEF is supplied to the first DEF tank and the second DEF tank.

[0114] Clause 7: The generator as described in any one of Clauses 1 to 6, wherein the connection line further includes a discharge port, wherein the discharge port allows DEF to be discharged from the first DEF tank and the second DEF tank.

[0115] Clause 8: A generator as described in any one of Clauses 1 to 7, wherein the connecting line includes a conduit portion and a heating portion, the heating portion including a thermal switch and an insulating portion, the thermal switch being configured to control the power supply to a heating coil, and the insulating portion surrounding the heating coil.

[0116] Clause 9: A generator as described in Clause 8, wherein the thermal switch supplies power to the heating coil when the thermal switch detects that the temperature of the environment in which the generator is disposed is below a temperature threshold.

[0117] Clause 10: The generator as described in any one of Clauses 1 to 9, wherein the diesel emission control system further comprises:

[0118] Engine controller; and

[0119] A temperature sensor configured to measure the temperature of DEF in at least one of the first DEF tank and the second DEF tank, the temperature sensor also configured to provide the engine controller with a first signal corresponding to the measured temperature;

[0120] The engine controller is configured to generate a second signal to initiate heating when the first signal indicates that the temperature of the DEF is below a threshold.

[0121] Clause 11: The generator as described in Clause 10, wherein the diesel emission control system further includes:

[0122] A generator controller; wherein the generator controller is configured to detect whether the engine controller has generated the second signal, and wherein the generator controller is further configured to generate a third signal in response to detecting that the engine controller has generated the second signal, to initiate heating;

[0123] The second signal causes engine coolant to be delivered to the first tank heating assembly; and

[0124] The third signal causes engine coolant to be delivered to the second tank heating assembly.

[0125] The various embodiments described above are provided by way of example only and should not be construed as limiting the appended claims. Those skilled in the art will readily recognize that various modifications and changes can be made without following the exemplary embodiments and applications shown and described herein, and without departing from the full scope of the appended claims.

Claims

1. A diesel emission control system, comprising: A reservoir comprising a first DEF tank and a second DEF tank, the first DEF tank and the second DEF tank being fluidly connected; An inlet, the inlet being connected to each of the first DEF can and the second DEF can, the inlet including a single fill port; A pump, fluidly connected to at least one of the first DEF tank and the second DEF tank, the pump being configured to pump DEF from said at least one of the first DEF tank and the second DEF tank; and A heating system, comprising a first tank heating coil assembly and a second tank heating coil assembly.

2. The diesel emission control system as described in claim 1, wherein, The heating system includes an engine coolant supply line configured to deliver coolant from the engine cooling circuit to the first DEF tank and the second DEF tank.

3. The diesel emission control system of claim 2, further comprising an engine controller configured to control the delivery of coolant to the first DEF tank.

4. The diesel emission control system of claim 3 further includes a generator controller configured to control the delivery of coolant to the second DEF tank.

5. The diesel emission control system as described in claim 3, wherein, The control of coolant delivery to the first DEF tank includes selectively adjusting the position of the first tank coolant reversing valve, which is in fluid communication with the engine coolant supply line.

6. The diesel emission control system as described in claim 4, wherein, Controlling the delivery of coolant to the first DEF tank includes selectively adjusting the position of a first coolant reversing valve that is in fluid communication with the engine coolant supply line, and wherein controlling the delivery of coolant to the second DEF tank includes selectively adjusting the position of a second coolant reversing valve that is in fluid communication with the engine coolant supply line.

7. The diesel emission control system as described in claim 1, wherein, The first DEF tank and the second DEF tank are fluidly connected by a connecting pipeline, which includes a conduit section and a heating section.

8. The diesel emission control system as described in claim 7, wherein, The heating element includes a thermal switch configured to control the supply of power to the heating coil.

9. The diesel emission control system as described in claim 8, wherein, The connecting pipeline also includes a discharge port.

10. A DEF storage system, comprising: A storage device comprising a first DEF tank and a second DEF tank, the first DEF tank being fluidly connected to the second DEF tank via a connecting line that provides equalization of the DEF levels in the first DEF tank and the second DEF tank; An inlet, the inlet being connected to at least one of the first DEF tanks; and A pump connected to at least one of the first DEF tank and the second DEF tank, the pump being configured to pump DEF from both the first DEF tank and the second DEF tank.

11. The DEF storage system of claim 10, wherein, The connecting pipeline includes a discharge port.

12. The DEF storage system of claim 10, wherein, The connecting pipeline is a heated connecting pipeline.

13. The DEF storage system of claim 10, wherein, The inlet includes a first tank inlet line, which is fluidly connected to the first DEF tank.

14. The DEF storage system of claim 13, wherein, The inlet also includes a second tank inlet line, which is fluidly connected to the second DEF tank.

15. The DEF storage system of claim 14, wherein, The inlet also includes a main inlet, which is fluidly connected to each of the first tank inlet line and the second tank inlet line.

16. The DEF storage system of claim 10, further comprising a heating system for heating the DEF in the storage device.

17. The DEF storage system of claim 16, wherein, The heating system includes an engine coolant supply line that supplies engine coolant to each of the first DEF tank and the second DEF tank.

18. The DEF storage system of claim 17, wherein, The heating system further includes a first coolant reversing valve and a second coolant reversing valve, each of which is selectively adjustable between an open position and a closed position. When the first coolant reversing valve is in the open position, the first coolant reversing valve allows coolant to flow from the engine coolant supply line to the first DEF tank, and the second coolant reversing valve allows coolant to flow from the engine coolant supply line to the second DEF tank.

19. The DEF storage system of claim 18, wherein, The engine coolant supply lines include a main supply line, a supply T-fitting, a first tank supply line, and a second tank supply line, wherein each of the main supply line, the first tank supply line, and the second tank supply line is connected to the supply T-fitting, wherein the first tank supply line is further connected to the first coolant reversing valve, and wherein the second tank supply line is also connected to the second coolant reversing valve.

20. A mobile diesel generator, comprising the DEF storage system as described in claim 10.

Images