Patent Application
20170355245
The present disclosure relates to thermal energy storage systems for vehicles, such as coolant thermal energy storage systems.
This section provides background information related to the present disclosure, which is not necessarily prior art.
Vehicle engines often include a liquid cooling system, which circulates coolant through pipes and passageways in the engine in order to regulate temperature of the engine. As the coolant is circulated through a warm engine, it absorbs heat in order to cool the engine. After the coolant exits the engine, it passes through a heat exchanger, or radiator, which transfers heat from the coolant to air blowing through the heat exchanger. Typical combustion engines run most efficiently when the coolant is about 200° F. (93° C.). At this optimal temperature, the engine's combustion chamber is warm enough to completely vaporize fuel, thereby optimizing combustion and reducing emissions.
During a cold engine start, the coolant is typically below this optimal temperature, which may undesirably result in reduced fuel economy and increased engine wear. Thus, onboard thermal energy storage systems exist for maintaining coolant at a predetermined temperature. While current onboard thermal energy storage systems are suitable for their intended use, they are subject to improvement. The present teachings advantageously provide for coolant thermal energy storage systems and methods that are more efficient, do not add weight, complexity, or cost to the vehicle, and provide increased fuel economy/emissions benefits over onboard thermal energy storage systems.
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
The present teachings provide for thermal energy storage systems, such as for maintaining coolant of a vehicle engine at or above a predetermined target temperature. The thermal energy storage systems include a coolant tank that is external to the vehicle. The coolant tank is configured to receive coolant from the vehicle, and maintain the coolant at or above a predetermined temperature prior to the coolant being returned to the vehicle.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only of select embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings.
With initial reference to
When the present teachings are adapted to store coolant at or above a predetermined temperature, the vehicle 10 can be any suitable vehicle including a propulsion system 12 cooled by a liquid cooling system, such as a passenger vehicle, semi-truck (illustrated in
The vehicle 10 can be solely propelled by the engine 12. The vehicle 10 may alternatively be configured as a hybrid electric vehicle, battery electric vehicle, hydrogen fuel cell vehicle, etc., and thus may include an electric motor powered by onboard batteries. When configured as a hybrid, the vehicle 10 may include an EV outlet 22, configured to receive a plug of a charger. The coolant outlet/inlet 20 can be located proximate to EV plug outlet 22 for convenience when the vehicle 10 is a hybrid.
Once coolant of the vehicle 10 has been transferred to the tank 112, the coolant can be maintained at or above a predetermined temperature in any suitable manner, such as by the heater 116. The predetermined temperature can be any suitable temperature, such as a temperature at which the particular engine 12 operates most efficiently, such as about 200° F. (93° C.). Shortly before the engine 12 is started, the coolant is pumped back to the vehicle 10, and specifically to the engine 12. Thus when the engine 12 is started, the coolant will help the engine quickly reach its optimal operating temperature, thereby improving fuel economy and reducing emissions.
The system 110 is advantageously separate from the vehicle 10, which allows the coolant 114 to be maintained at or above a predetermined temperature without adding additional weight, complexity, and cost to the vehicle 10. The system 110 can be provided at any suitable location, such as at a residence, business, roadside refueling station, truck stop, public parking lot, etc. The system 110 can be paired with an EV charging system 50. The EV charging system 50 can include a charging cable 52, which can plug into the EV plug outlet 22 in order to charge batteries of the vehicle 10.
The general system 110 of
The system 210 includes an insulated tank 212 configured to store coolant 214, or any other suitable liquid, therein. Heater 216 can be any suitable heater configured to maintain the coolant 214 at or above a predetermined temperature, such as a gas or electric heater for example. The tank 212 can include a vacuum pump 218 configured to evacuate air from within the tank 212, in order to facilitate heat retention of the coolant 214. A lid 230 is configured to move up and down within the tank 212 as the amount of coolant 214 therein increases or decreases, which helps retain heat within the tank 212 and thereby improve the insulation capabilities of the tank 212. The lid 230 may be an insulated lid that floats on the coolant 214, or is otherwise configured to move with the coolant level in any suitable manner.
The tank 212 is connected to the vehicle 10 with any suitable connector, such as hose 220, which includes a connector 222. The hose 220 is substantially similar to the hose 120, and thus the hose 220 is designated with the same reference numerals, but increased by 100. Coolant 214 can be pumped between the vehicle 10 and the tank 212 in any suitable manner, such as with a pump 224, which is substantially similar to, or the same as, the pump 124.
With reference to
A plurality of hoses 320A, 320B, 320C, and 320D individually connect each one of the vehicles 10A, 10B, 10C, and 10D respectively to the tank 312. The hoses 320A-320D can be connected to any suitable coolant outlet/inlet of the vehicles 10A-10D, such as the exemplary outlet/inlet 20 illustrated in
The system 110 advantageously provides a single tank 312 configured to warm the coolant 314 of the vehicles 10A-10D. For example, when the hoses 320A-320D are connected to the vehicles 10A-10D respectively, coolant 314 from each one of the vehicles 10A-10D is pumped by the pump 324 into the tank 312. At the tank 312, the coolant 314 from each one of the vehicles 10A-10D mixes together and is commonly heated by heating element 316, such as when the vehicles 10A-10D are parked overnight. Before any one or more of the vehicles 10A-10D is started, such as for a morning cold start, the pump 324 pumps the warmed coolant 314 to the one or more vehicles about to be started so as to bring the engine(s) thereof to their optimal operating temperatures more quickly. The system 310 is particularly useful for businesses having a fleet of vehicles, as well as residential users having more than one vehicle.
Thermal energy from the warmed coolant 414 can be radiated throughout a passenger cabin 60 of the vehicle 10 so as to warm the passenger cabin even when the engine 12 of the vehicle 10 is off. This advantageously eliminates the need to keep the engine 12 at an idle in order to generate heat for the passenger cabin 60 when the vehicle 10 is parked. A three-way valve 440 is included, which connects the tank 412, engine 12, and fluid flow path that circulates coolant to and from the passenger cabin 60. The three-way valve 440 provides for at least two different modes of operations: a first mode in which coolant flowing from the engine 12 is directed to the tank 412, and flow of coolant to the passenger cabin 60 is blocked; and a second mode of operation in which coolant flow to the engine 12 is blocked, and coolant from the tank 412 is directed to circulate through the passenger cabin 60. An exemplary application for the system 410 is at a truck stop or rest stop, where the vehicle 10, which can be configured as a semi-truck as illustrated in
Unlike the system 210, the system 610 includes a heating element in the form of a hot water pipe 650. The hot water pipe 650 can be any suitable hot water pipe, such as a hot water pipe of any suitable building, such as a residence. The hot water pipe 650 can be configured in any suitable manner in order to supply water to a water to coolant heat exchanger 460 located inside the tank 612 to heat coolant 614 within tank 612 and maintain the coolant 614 at or above the predetermined temperature. For example, the hot water pipe 650 can extend through or around the tank 612. As hot water passes through the hot water pipe 650, thermal energy thereof is transferred to coolant 614 within the tank 612 so as to heat the coolant 614 and maintain the coolant 614 at or above the predetermined temperature. Conversely, coolant heated by the engine 12 can heat water within the pipe 650 when hot coolant is pumped from the engine 12 to the tank 612 just after the engine 12 is turned off. Thus when the pipe 650 is a water pipe of a home hot water supply, for example, using warm coolant from the vehicle 10 to heat water of the home hot water supply advantageously reduces the homeowner's energy bill.
The present teachings provide numerous advantages. For example, by arranging the tanks 112, 212, 312, 412, and 612 stationary and external to the vehicle 10 it is possible to increase storage capacity, improve thermal insulation, and maintain the coolant, or any other suitable liquid, at an elevated temperature more efficiently as compared to onboard systems for storing liquids at or above a predetermined temperature.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
