Patent Application
20170197518
The present disclosure generally relates to regenerative energy and, more particularly, to methods and systems for recovering braking energy via dynamic mobile wireless power transfer.
Viewed as a whole, a group of vehicles driving on the road are wasting much energy due to individual acceleration and deceleration operations. In an acceleration operation, a vehicle often requires energy to increase its speed, be it a fuel-powered, electricity-powered or hybrid vehicle. On the other hand, a vehicle also consumes energy in a deceleration operation. When a vehicle decelerates, it consumes energy by losing its kinetic energy through friction provided by a braking system of the vehicle. The unwanted kinetic energy is thus “wasted” primarily in the form of dissipated heat.
Non-limiting and non-exhaustive embodiments of the present disclosure are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various figures unless otherwise specified.
In the following description, reference is made to the accompanying drawings that form a part thereof, and in which is shown by way of illustrating specific exemplary embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the concepts disclosed herein, and it is to be understood that modifications to the various disclosed embodiments may be made, and other embodiments may be utilized, without departing from the scope of the present disclosure. The following detailed description is, therefore, not to be taken in a limiting sense.
As stated previously, a vehicle consumes energy in both acceleration and deceleration operations. In particular, when a vehicle decelerates, much energy is wasted due to the unwanted kinetic energy of the vehicle being dissipated as heat through friction provided by the braking system of the vehicle. It therefore follows logically that, there would not be so much energy wasted if the unwanted energy during the deceleration process of a vehicle can be somehow “recouped” or otherwise harnessed, and advantageously transferred to a nearby vehicle that requires power to perform an acceleration operation. That is, according to embodiments of the present disclosure, energy dissipated by one vehicle may be harnessed and stored, and eventually used to charge another vehicle. In this way, the energy is optimally distributed between the vehicles when viewed as a whole.
The present disclosure promotes a mechanism or scheme in which the unwanted kinetic energy during the deceleration process is recouped or otherwise harnessed by a regenerative braking apparatus equipped in the vehicle. The regenerative braking apparatus, when engaged, converts at least part of the kinetic energy of the vehicle to another form, usually in the form of electric power. The regenerative braking apparatus is readily applicable to a vehicle powered, at least partially, by electricity, such as an electric vehicle (EV) or a hybrid electric vehicle (HEV). During the deceleration process, the unwanted kinetic energy of the vehicle can thus be converted, at least partially, by the regenerative braking apparatus to electric power, and saved in a battery of the vehicle. The harnessed electric power, or electric energy, is thus available to be used by the vehicle in a next operation that demands power, such as a following acceleration operation.
Although a regenerative braking apparatus is mostly applicable to EVs and HEVs, it is not limited to be equipped to and utilized by such vehicles only. Rather, a regenerative braking apparatus can be equipped to and utilized by a conventional, non-electric-powered vehicle as well. Additionally, as an example, a work truck powered by a diesel engine may carry on it some equipment that demands much electricity, such as an electric towing crane, and the electricity can be provided by a regenerative braking apparatus equipped thereon. As another example, a fire truck or a police car is surely to consume lots of electric power for its loud sirens and bright flashing lights, and thus can utilize the electric power recouped by a regenerative braking apparatus if it is available.
A readily recognized limitation of such a scenario of recovering and utilizing braking energy is that there is only certain capacity for the battery equipped in the vehicle, or “on board”. The on-board battery has a certain capacity, and it is obvious that the braking energy cannot be recovered and recouped beyond the capacity of the on-board battery. Once the on-board battery is full, the unwanted kinetic energy of the vehicle cannot be further recovered and stored even if the regenerative braking apparatus is engaged. Consequently, the kinetic energy is still to be lost and wasted.
Another limitation of the scenario mentioned above resides in that a conventional fuel-powered sedan or car in typical daily use will not take part of this energy efficient approach, and thus the unwanted kinetic energy during a deceleration operation would be totally wasted as dissipated heat and vibration. That is, even if equipped a regenerative braking apparatus, such a car would not have a place for the kinetic energy recouped during a deceleration operation to go. Besides, even with the head lights and car radio accounted for, there is little demand of electricity for such a car, and the demand of electricity is already readily supplied by its small-capacity on-board battery.
With these limitations recognized, the present disclosure is to further advocate a use of a wireless power transfer to dynamically transfer the recovered electric power via the regenerative braking apparatus out of the vehicle. That is, through the wireless power transfer, a vehicle can wirelessly transfer, at least partially, the recovered electric power to a destination, a storage or a receiving object located outside the vehicle. The wirelessly transferred electric energy can subsequently be utilized by the receiving object, or simply stored in the storage for later use by another object demanding electric power. In this scenario with dynamic wireless power transfer, the aforementioned limitations are lifted, and a power recovering and reutilizing system is thus formed between the vehicle that transfers the electric power out of itself (i.e., the “contributing vehicle”) and the other object that demands electric power. In some embodiments, the other object that demands electric power is another vehicle (i.e., the “receiving vehicle”).
In some embodiments, the storage can be a battery or an electrical capacitor located outside both the contributing vehicle and the receiving vehicle. As the power storage is located outside a vehicle, mostly likely located in the vicinity of the place where the energy recovery takes place, the capacity of the storage can be greatly increased. With a sufficiently large capacity for storing the recovered energy, essentially unlimited amount of brake energy can be recovered and stored in a form of electric power for later use. It is to note that the power storage is advantageously disposed close to the contributing vehicle and the receiving vehicle so as to avoid transmission loss of a significant portion of the recovered brake energy over otherwise long distance power line transmission.
In some embodiments, there may not be the storage included in the power recovering and reutilizing system, in which case the recouped energy is readily sent to the receiving vehicle and being used (i.e., “charges” the receiving vehicle). In some embodiments where a battery and/or a capacitor is included as the storage media, the receiving vehicle may be the same as the contributing vehicle. Namely, a vehicle may wirelessly transfer the recovered braking energy in the form of electricity to the storage media to be saved, and then the storage media will, at a later time, charge the same vehicle by wirelessly transferring back the recovered braking energy to the vehicle.
In some embodiments, the wireless power transfer or charging operations, as disclosed above, may be implemented or realized by using so-called “inductive power transfer”. A charging pad that includes inductive coils may be placed on, buried under or embedded in the surface of a local road structure. When a vehicle equipped with a regenerative braking apparatus drives on or near the charging pad, electric power transfer can be configured to take place between the charging pad and the vehicle. The direction of the energy transfer can be configured as desired, either from the vehicle to the charging pad (in the case where the vehicle is a contributing vehicle) or from the charging pad to the vehicle (in the case where the vehicle is a receiving vehicle). The inductive power transfer is a non-contact power transfer that may work over a distance between a power source and a receiving party. Therefore a vehicle needs not to be in contact with a charging vehicle for the inductive power transfer to take place. That is, the wireless power transfer advocated by the present disclosure is “dynamic” in nature, where a vehicle is free to move and charge (i.e., transfer electric power to) or discharge (i.e., transfer electric power from) various charging pads as the vehicle moves passing by them or runs near them. Another nature of the inductive power transfer is that the transfer efficiency may not be 100%. That is, a contributing vehicle may be able to transfer only a part of the recovered electric energy to a charging pad. By the same token, a charging pad may be able to transfer only a part of the electric energy available to a receiving vehicle.
It is to note that, for the same reason as for the energy storage previously mentioned, the charging pads are also advantageously disposed close to the contributing vehicle and the receiving vehicle so as to avoid transmission loss of a significant portion of the recovered brake energy over otherwise long distance power line transmission. Preferably, the charging pads and the energy storage media, if any, are located within or in the vicinity of a local road structure, such as a highway access, an underpass, an overpass, a two-way road section located on a slope, a road section having a dip, a stop sign, a toll booth or a bus stop, a road section having a turn, a highway cloverleaf interchange or a surface roundabout circular intersection.
It is also worth noting that, the employment of off-vehicle storage batteries in conjunction with dynamic wireless power transfer opens up a new category of sources for regenerative power, namely, the fuel-powered heavy-load cargo trucks, commercial trucks, recreational vehicles (RVs) and the like. With its heavy mass, a vehicle in this category carries a massive amount of kinetic energy as compared to a typical sedan. But that also means a huge amount of kinetic energy is left to be wasted and dissipated as heat in a deceleration operation, unless it is equipped with a regenerative braking apparatus. However, there is little incentive for these heavy-load vehicles to include a regenerative braking apparatus, for the huge mass of the vehicles essentially prevents them from using electric power as even part of the source of their driving power. Consequently, the huge amount of kinetic energy in a deceleration operation is not recouped and reutilized. Thanks to the off-vehicle storage batteries in conjunction with dynamic wireless power transfer, both advocated in the present disclosure, the heavy-load trucks and similar vehicles are provided with feasible and practical way to recoup their huge amount of brake energy. This provides a new category of sources for regenerative power to benefit other vehicles and objects that demands power. For example, such an energy recovery system can be implemented at a UPS or FedEx cargo truck facility located close to a highway access, and the recovered brake energy from the hundreds of heavy-load trucks coming down from the exit ramp of the highway access every day may very well be sufficient to cover the daily utility electricity usage of the facility.
Energy recovery system 100 includes charging pads 141 and 143, each of which may be placed on, buried under or embedded in the surface of exit ramp 110. In particular embodiments, charging pads 141 and 143 are made of a metal, alloy, or other conducting (or superconducting) material. In some embodiments, charging pads 141 and 143 include coils that are encased by a material that protects the charging pads from environmental elements, such as snow, rain, tire contact, wear caused by tire contact, and the like. The material encasing charging pads 141 and 143 will protect the coils without interfering with the inductive transfer of power. Charging pads 141 and 143 may be positioned substantially planar with the road surface. In alternate embodiments, charging pads 141 and 143 are positioned slightly below the road surface to reduce the likelihood of damage from snow plows and the like.
When vehicle 161 gets close to or on charging pad 141, it may be performing a deceleration operation, and electric power generated due to the deceleration by the regenerative braking apparatus equipped on vehicle 161 may be wireless transferred from vehicle 161 to charging pad 141. Similarly, when vehicle 163 gets close to or on charging pad 143, it may be performing a deceleration operation, and electric power generated due to the deceleration by the regenerative braking apparatus equipped on vehicle 163 may be wireless transferred from vehicle 163 to charging pad 143.
Energy recovery system 100 also includes charging pads 142 and 144, each of which may be placed on, buried under or embedded in the surface of entrance ramp 120. When vehicle 162 gets close to or on charging pad 142, it may be performing an acceleration operation that demands more electric power. Charging pad 142 may receive at least part of the electric power generated by vehicle 161 from charging pad 141 via transmission line 170, and then supply the electric power to vehicle 162 wirelessly for the acceleration operation. Similarly, when vehicle 164 gets close to or on charging pad 144, it may be performing an acceleration operation that demands more electric power. Charging pad 144 may receive at least part of the electric power generated by vehicle 163 from charging pad 143 via a first portion 173 of a transmission line 175, battery 153 and a second portion 174 of transmission line 175, and then supply the electric power to vehicle 164 wirelessly for the acceleration operation.
Energy recovery system 100 may also include one or more energy storage media such as batteries 151, 152 and 153 as shown in
Energy recovery system 100 may also include one or both of vehicle 161 and 163 that may contribute recovered brake energy to system 100 in the form of electric power, and may also include one or both of vehicle 162 and 164 that may receive at least a part of the recovered brake energy from system 100 in the form of electric power to charge their respective on-board batteries that provide the driving power of vehicles 162 and 164.
The example energy recovery system illustrated in
The example energy recovery system illustrated in
The example energy recovery system 400 may include charging pads 441 and 442 disposed on downhill lane 410 and uphill lane 420, respectively, of the two-way road section in
In some embodiments, vehicle 561 and vehicle 562 in
A similar mechanism and operation as disclosed by energy recovery system 500 of
The example energy recovery system 500 may include charging pads 541 disposed in first portion 510 of the road section before stop sign 580. The example energy recovery system 500 may also include charging pads 542 disposed in second portion 520 of the road section after stop sign 580. The system may also include battery 553. The system may further include vehicles 561 and 562.
In some embodiments, vehicle 661 and vehicle 662 in
A similar mechanism and operation as disclosed by energy recovery system 500 of
The example energy recovery system illustrated in
At 710, process 700 may involve charging pad 143 of a highway access wirelessly receiving an electric power generated by a regenerative braking apparatus of vehicle 163. Block 710 may be followed by block 720.
At 720, process 700 may involve charging pad 144 of the same highway access receiving the electric power from charging pad 143 via transmission line 175. This may involve operations performed at sub-blocks 722 and 724. At 722, process 700 may involve one or more energy storage media (e.g., battery 153) receiving the electric power from charging pad 143 via first portion 173 of transmission line 175. Sub-block 722 may be followed by sub-block 724. At 724, process 700 may involve charging pad 144 receiving the electric power from battery 153 via second portion 174 of transmission line 175. Sub-block 724 may be followed by block 730.
At 730, process 700 may involve charging pad 144 wirelessly charging vehicle 164 with at least a portion of the electric power generated by the regenerative braking apparatus of vehicle 163.
In some embodiments, in receiving the electric power by charging pad 144 from charging pad 143, process 700 may involve battery 153 receiving the electric power from charging pad 143 via first portion 173 of transmission line 175. Process 700 may also involve charging pad 144 receiving the electric power from battery 153 via second portion 174 of transmission line 175.
In particular embodiments, on-vehicle circuitry and software are used to generate electricity during deceleration and store the generated electricity. The on-vehicle circuitry and software may use the stored power during accelerations, changes in altitude, or overcoming aerodynamic drag, friction, and the like. Additionally, the on-vehicle circuitry and software may wirelessly transfer some of the power to a receiving element (i.e., charging pad) in the road surface.
In some embodiments, the described systems include circuitry and software that, similar to an electric utility grid, transmits power and temporarily stores power. Excess power can be distributed to a normal power grid. However, in some embodiments, the systems described herein are installed in areas where vehicles regularly accelerate and decelerate so the power generated during deceleration can be locally provided to other vehicles during acceleration. In particular embodiments, vehicles wirelessly communicate with the grid to advertise how much power the vehicle can contribute (i.e., transfer) to the grid and/or how much power the vehicle needs to receive (or is capable of receiving into its battery storage system).
In some embodiments, in receiving wirelessly the electric power generated by the regenerative braking apparatus of the contributing vehicle, process 700 may involve charging pad 143 receiving the electric power through inductive power transfer.
In some embodiments, in charging wirelessly the receiving vehicle with at least a portion of the electric power, process 700 may involve charging pad 144 charging a battery of the receiving vehicle with the electric power through inductive power transfer.
Numerous advantages are resulted according to the systems and methods according to the various embodiments of the present disclosure. The advantages include, at least, unlimited brake energy recovery due to off-vehicle storage batteries, longer sustainability and/or a smaller size of the on-board battery of the receiving vehicle, low power transmission loss due to short distance power transmission, and less wearing and longer life span of braking pads, just to name a few.
The articles “a” and “an” are used herein to refer to one or to more than one (i.e., to at least one) of the grammatical object of the article. By way of example, “a user” means one user or more than one users. Reference throughout this specification to “one embodiment,” “an embodiment,” “one example,” or “an example” means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present disclosure. Thus, appearances of the phrases “in one embodiment,” “in an embodiment,” “one example,” or “an example” in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, databases, or characteristics may be combined in any suitable combinations and/or sub-combinations in one or more embodiments or examples. In addition, it should be appreciated that the figures provided herewith are for explanation purposes to persons ordinarily skilled in the art and that the drawings are not necessarily drawn to scale.
Embodiments in accordance with the present disclosure may be embodied as an apparatus, method, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware-comprised embodiment, an entirely software-comprised embodiment (including firmware, resident software, micro-code or the like), or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module,” or “system.” Furthermore, embodiments of the present disclosure may take the form of a computer program product embodied in any tangible medium of expression having computer-usable program code embodied in the medium.
The flow diagrams and block diagrams in the attached figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flow diagrams or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It will also be noted that each block of the block diagrams and/or flow diagrams, and combinations of blocks in the block diagrams and/or flow diagrams, may be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. These computer program instructions may also be stored in a computer-readable medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable medium produce an article of manufacture including instruction means which implement the function/act specified in the flow diagram and/or block diagram block or blocks.
Although the present disclosure is described in terms of certain embodiments, other embodiments will be apparent to those of ordinary skill in the art, given the benefit of this disclosure, including embodiments that do not provide all of the benefits and features set forth herein, which are also within the scope of this disclosure. It is to be understood that other embodiments may be utilized, without departing from the scope of the present disclosure.
