CA2514433A1 - Load management auxiliary power system - Google Patents
Load management auxiliary power system Download PDFInfo
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- CA2514433A1 CA2514433A1 CA002514433A CA2514433A CA2514433A1 CA 2514433 A1 CA2514433 A1 CA 2514433A1 CA 002514433 A CA002514433 A CA 002514433A CA 2514433 A CA2514433 A CA 2514433A CA 2514433 A1 CA2514433 A1 CA 2514433A1
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- Prior art keywords
- auxiliary
- auxiliary power
- power system
- engine
- truck
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3226—Self-contained devices, i.e. including own drive motor
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- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
An auxiliary power system for trucks, the power system having a small diesel engine coupled to an air conditioner compressor and an automotive style alternator. During hot weather the auxiliary engine rotates the air conditioner compressor to provide cool air to the truck and electrical power to truck accessories by load management controls. When peak loads occur, the voltage is reduced into the field of the alternator allowing the small engine to simultaneously operate the air conditioning compressor. During cold weather the engine coolant is used to cool the auxiliary engine and is circulated through a heat exchanger for warming of the truck interior. Fall capacity of the alternator is allowed, accommodating the higher amp draws typical of cold weather diesel operation.
Description
LOAD MANAGEMENT AUXILIARY POWER SYSTEM
2 RET~ATED APPLICATIONS
3 This application is a continuat.ian-in--part of applicant's 4 co~pend~.tYy U.S. App~.ication No. 10/060,091 filed Janurary 29, 2002, the contents of which are hereby ~.ncorporated by 6 reference.
8 FIELD OF TIDE T.N~TBrITTON
9 This invention is related to auxiliary power systems, in particular, to an auxiliary power system having a load shedding 12 voltage regulator Which prioritizes air conditioning by 12 reducing electrical power generation to mib.imize auxiliary 13 engine size requirements, thus reducing space and weight 14 requirements for the auxiliary power system.
17 Total fossil fuel waste, and the associated economic 2$ waste, within the trucking industry is staggering. It is 29 estimated that six out of every fourteen hours of truck operation are spent idling. Federal and State laws alike limit 2~, the number of hours that each truck driver can legallar drive a 22 truck in a twenty-four hour period. During the xemainder of 23 the time the driver must rest for the next available driving 24 period. Rest periods are often spent in rest areas, truck stops or along the side of an interstate. Trucks or tractors r 1 are often supplied with a "sleeper" for the driver to spend his 2 or her rest time_ Often the sleeper_ includes modern amenities 3 such as a television, vCR, bvD, satel~.ite dish, refrigerator, 4 air conditioner, coffee maker, even a microwave oven. While such items may run on direct current prov~.ded by an engine 6 mounted alternator, or even alternating current by use of an 7 inverter, the truck engine must rema~.n running to prevent the 8 discharge of the batteries used for starting of the diesel 9 engine. During idle a typ~.cal diesel truck engine will burn 1o about one gallon of diesel fuel per hour. Tn addition to the 1~. cost of the diesel fuel, normal maix~tenance costs to the truck 12 engine axed its associated systems axe increased.
13 Tn order to reduce fuel and maintenance costs, txu.cks Z4 oFten utilize an auxiliary generator to provide electrical z5 power for systems with~.n the truck when the truck's engine is 1G not xwnning. The Applicant is a well known assembler of diesel 17 engine/gerierators packages and has been awarded patents for 18 variov.s arrangements_ U_S. Patent Nvs. 5,765,805, 6,047,942, 29 6,219,638, &,677,68, 6,756,693 and 6,812,582 granted to the 2o Applicant disclose combination engine/generator sets that are 2I -lightweight and of novel space saving configurations, the 22 contents of which are incorporated herein by reference.
23 The prior art also discloses numerous systems by which air 24 conditioning and heating can be provided to the interior of a 25 truck while the main engine is not running. For example, U.S.
z6 Patent No. 4,756,359 discloses an auxia.iary power system that 1 includes an auxila.ary engine, electrical alternator, water 2 pump, air conditioning Compressor and heat exchanger. The heat 3 exchanger is used to receive hot exhaust gases from the auxiliary engine for purposes of heating coolant routed through the truck~a engine.
6 'U.S. Patent No_ 4, 762, 170 discloses an auxiliary po~.ter 7 system for trucks or other heavy duty vehicles. The system 8 includes an auxiliary engine sized to Nimultaneously power an 9 air conditioner compressor and a generator. The cooling system ZO of the auxiliary engine is connected to the cooling system of 1s the truck's engine to keep the truck engine warm ix~ cold 12 weather.
13 U_5. Patent No. 5,528,901 discloses an auxiliary power 14 system which includes an auxiliary engine sized to power an air z5 compressor, a v'ater pump, an A/C compressor and an oil pump_ 16 The system replaces the original. bank of batteries supplied 7.7 with the truck and replaces the OEM electric starter With a 18 pneumatic starter.
19 Problems generally associated with the use of these prior zo art devices relate to size, weight, and placement of the 21 systems. The size of an auxiliary generator is critical for 22 vehicular use. If the overall dimensions are too large, there 23 will be insufficient areas on a truck for which Co place the 24 system. Other problems result from complexity of installation.
25 and the costs associated therewith. Still other problems 26 result from sharing coolant systems. Small engirxes rarely -3 ~~
1 generate enough heat to maintain temperature within a large 2 cooling system such as those supplied with a large truck. As 3 a result of the constant cold cylinder tenzperature the small 4 engine runs inefficiently. Some systems increase the size of the auxiliar~r engine or p7.ace false loads on the auxiliary 6 engines to increase heat transferred tv the large engine's cooling system to maintain higher overall temperatures.
s However, the false loads and oversiaed engizxes decrease the 9 overall efficiency of these systems. Other problems and l0 expense are incurred with the use of water-to-water or water-~l to--oil heat exchangers. The heat exchangers axe expensive, 12 difficult to install, and require each body of fluid to be 13 equipped with an independent pump for fluid circulation.
14 It is also known to vary the output of a generator for specific applications. For example, U.S. Patent No. 4,099,067 s6 discloses a control for diesel-electric motor-generator sets.
17 The device allows temporary overloads to be accommodated 18 without engine lugging by reducing line voltage if an attempt 19 is made to draw more than a preset maximum normal Wattage. The line voltage reduction is accomplished by increasing the 21 vmpedaance of the voltage regulator input circuit when a signal 22 genera7.ly proportional to line voltage and load current exceeds 23 a preset reference signal to wha.ch it is compared.
24 U.S. Patent No. 5,512,813 discloses an A/C generator output controlling apparatus. The control device determines 26 the field current to be supplied to a field~coil on the basis 1 of a voltage deviation between a battery charging vol-tage and 2 a battery target voltage.
3 U.S. Patent No. 5,739,6~~ discloses a vehicle power 4 generating system. The system includes a controller wlxich varies the supply of leading phase current supplied to the 6 power generator. The system is particularly suited fox low 7 RPM, high power generation_ 8 U.S. Patent No. 5,726,559 discloses a synchronous electric 9 pov~r generating apparatus and magnetisation control method.
Advance-phase currents are supplied to stator wir~,dings via 11 semiconductor switching devices by controlling the 12 semiconductor switching devices during power generation. The 13 devzGe and method axe particularly su~.ted to control rotox 14 temperature and reduce magnetic flux in an alternating current power generator.
16 U.S. patent No. 5,726,557 discloses a vehicular power 17 system. The device includes a rotating alternating current 1s machine having polyphase armature coils and a full wave i9 rectifier for rectifying the generated voltage by a plurality of SiC-MOSF~Ts, to give a rectified output to the battery unit.
21 ~'he device also .includes a control device for selectively 22 turning on the plurality of SiC-MOSFETs to raise the generated 23 voltage by short-circuiting and open-circuiting the armature 24 coils on the basis of the phases of voltage generated by the x-otating alternating current machine.
26 These prior art devices are generally geared to maximizing _ _ . ._ -6-:1 the output of a power generating device without overloading ox 2 overcharging the eler_trical system of the vehicle. The engizies 3 utilized to drive these devices are generally of sufficient 4 size to drive the generator at full capacity for extended periods. None of the prior art devices disclose or teach a 6 system which is Constructed to utilize a minimally sized engine 7 to prioritize anal drive alternative loads.
8 Thus, what is xieeded is an auxiliary power system that is 9 lightweight, consv.mes a small space, and may be used to Zo alternatively provide heating, eleetr~.caZ power or air 11 conditioning to the interior of a truck. The auxiliary power 12 system should be capable of shedding low priority demands for ~.3 maximiza,ng power supplied by the auxiliary engine.
1 ST~MA.R7f OF THE INVENTION
2 The instant ~.7rsvention system includes a small diesel 3 engine coupled to an air condit~.oner compressor, a generator or 4 alternator and a combination control xelayJregulator for S maxzmiaing the loads placed on the auxiliary engine. The truck 6 operator is provided with cozitrols ~or selective operation of 7 the auxiliary power system's various features which mar be 8 operated while the truck's main engine is ruiuzing or stopped.
In the preferred embodiment the auxiliary engine is sized so that it is not capable of simultaneous operation of all the I1 auxiliary systems to their max~,mum capacity. In a most 12 preferred embodiment the aux~.liary engine is rated from about 13 three SIP to about eight HP. Such engines are currently 14 available from manufacturers such as KUB~TA, and may have a horizontally or about vertically disposed cylinder_ 16 One embodiment of the auxiliary power system includes a 17 heating system. The heating system includes a water pump which 18 may be electric or mechanically driven by the auxiliary engine .
operator controls permit the water pump to circu~.ate water zo through the auxiliary engine to a sleeper heat exchanger, 21 radiator or both_ The heat exchanger may toe remotely mounted 22 within the interior of the truck to provide heat Within the 23 truck interior, and may further include an electric fan fox 24 forcing air across the heat exchanger to provide additional 2S heat. The fan may be operated via the driver's controls to z6 regulate,the amount o;~ air passed across the heat exchanger to 7. provide warmth to the truck's intet~ior. While the air 2 coz~ditioning compressor is turned off, via the dr~.ver~ s 3 controls, the full capacity of the alternator or generator is 4 available for the higher amp draws txpical of cold weather where diesel engines are harder to start and more electrical 6 accessoxies are ire use . ' 7 During hot weather operation the dri~rer may utilize the 8 controls to start the auxiliaxy engine. The auxiliary engine 9 may then be utilized to operate an air conditioner compressor and related air conditioner system components, whexein the 1z truck interior is kept cool. T.~uring this mode the auxiliary 1.2 engine is also utilized to operate the alternator or generator 13 to replenish power drawn from the truck batteries. 2n order 14 for the auxiliary engine to provide power for both accessories, z5 a control relay/regulator is utilized to switch the input field 16 .of the alternator, thereby reducing alternator output to 17 maximize the power output of the auxiliary engine. Should the z8 truck accessories draw more electrical power than the i9 alternator or generator supply during such a peak demand, the truck batteries operate as a reserve power source. When the 21 air conditioning compressvx cycles off, the control 22 relay/regulator causes the alternator or generator to increase 23 electrical output to replenish the truck batteries and supply 24 electrical power to other accessories. in this manner the power output provided lay the auxiliary engine may be more fully 26 utilized.than in prior art power systems_ ___ _ _ _ . -g-1 Thus, ari objective of the instazlt invention is to teach an 2 auxil~.ary power system for trucks that utilizes a minimally 3 sized engine to selectively operate air conditioning, heating 4 and power generating systems.
Another objective of the instant invention is to teach a 6 minimally sized aux~.li.ary power system for trucks capable of 7 selectively providing air conditioning, heating, and electrical power to the interior area of the truck.
9 Still another objective of the instant invention is to teach dzx auxiliary power system having a control iz relay/regulator constructed and arranged to maximize 1z utilization of the power supplied by the auxiliary engine.
z3 Yet another obj active of the instant invention is to teach 14 an auxiliary power system which includes a control ~.5 relay/regulator constructed and arranged to maximize 16 utilization of power supplied by an auxiliary engine by 1~ controlled reduction of electrical power production fox 18 simultaneous air conditioner compressor operation.
19 Still yet another objective of the instant invent~,on is to teach an auxiliary power system which utilizes existing truck 21 batteries as a power exchanger fox peak accessory leads.
22 Another objective of the invention is to teach an 23 auxi7.iary power system for trucks that captures heat ~rom the 24 engine coolant far warming of the truck interior.
Yet another objective of the invention is to teach the use 26 of an auxiliary power system that is inexpensirre, small in size 1 and lightweight.
2 other objectives and advantages of this ~.~nvention will 3 become apparent fxom the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments 6 of this invention.
8 BRIEF DESCRTPTION OF T~3E DRp,WINGS
9 Figure 1 is a. diagrammatic representation of the instant invention auxiliary power system;
11 Figure 2 is a diagrammatic representation of the instant 12 invention auxiliar~r power system used in conjunction with an 13 under bunk heat~:ng and air condition~.ng system; and 1g Figure 3 is a diagrammatic representation of the instant 1s snventivn auxi~.iary power system in a heat providing mode.
1 DETAILEi7 DESCRIPTION
2 Now referring to Fig. 1, a diagrammatic representation.of 3 one embodiment of the instant invention auxiliary power system 4 10o is illustrated. The auxiliary power system generally S includes an auxiliary engine 20 for selectively providing power 6 to an electrical generation system 1'02, an air conditioning 7 system Z04, and a heating system l05_ 2n the preferred 8 embodiment the auxiliary engine is sized so that it is not capable of simultaneous operation of the air condit~.onir~g to system and the electrical generation system to their respective 1~ full capacities. The auxiliary powez system includes a unique 1z control xelay/regulator combination 24, 28 for reducing ~.3 eJ.ectrical power produced by the electrical generation system 1~ 102 during simultaneous operation of the air conditioning 15 system 10~. This construction and arrangement per~eits the size 16 and weight of the auxiliary power system to be substantially 1'~ smaller than the power systems of the prior art. The 18 arrangement also permits tb.e auxiliary power system to utilize 19 a small single cylinder d~.esel erzgine which requires less 20 frec~ueat oil change intervals than those required by the larger 21 engines of the prior art.
22 Referring to Figs. 1-3, the auxiliary engine to is coupled 23 to a refrigerant compres sor, a . g. air eonditivner compressor 1z 2~ and an alternator 22. The air conditioner compressor is 25 generally an automotive style comQressor which includes a 26 magnetic.elutch, well known. xn the art, suitable for 1 compressing ally of the various refrigerants, also well known iaz 2 the art. In one embodiment the compressor 12 is constructed 3 and arranged to cooperate with the accumulator (not shown), 4 expansion valve (not shown), evaporator 16, condenser 14 and air conditioner coi~trols 18 supplied with a truck.
6 In the preferred embodiment, a high output automotive 7 style alternator 22 is suitably coupled to the auxiliary engine 8 1o for rotation thereof. The alternator 22 may be based on 12 9 volts, 24 volts or other voltage dependax~t upon the trucks l0 electrical system. In an alternative embodiment, a generator ~.1 may be utilized in place of the alternator 22 to provide 12 electrical current to various air conditioner support s3 components and other accessories as well as batteries. The 14 power produced by the alternator is available for operating 1S accessories such as an alternating current inverter 2o 16 connected to standard receptacles 30, a~.lowing the operation of 1~ household appliarsees such as raaors, coffee makers, microwave 18 ovens, alarm clocks, vCR~s and so forth. Further 12 volt 3:9 components and accessor~,es such as parking lights, interior 20 lights, television, CB radio, sound system, refrigerator, and 21 Zike devices, not shown, are all commonly used and require 22 power for operation. Should the power requirements be 23 exceeded, due to peak draw devices such as a microwave oven or 24 coffee maker, the existing truck batteries 38 will. produce the 25 necessary power by operat~.ng as a power sink.
26 in a'most preferred embodiment, a single cylinder iCubota 1 EL 300 AR engine capab~,e of producing about four HP is coupled 2 to a 12,000 BTU air conditioner compressor and a high output 3 alternator 22 of about x.20 amps on a 12 volt system. The size 4 of the Kabota engine and the horizontal orientation of the S cylinder allow the instant invention auxiliary power system 7.00 6 to be packaged into a small and light'vaeight add on device for 7 the trucking industry. Tn an alternative embodiment, a Kubota 8 EA 30o Ns engine capable of producing about seven HP may be 9 coupled to, or rotate an air conditioner compressor at a higher 20 rate, so as to produce about Z6, 000 BTUs of air conditioning as hl well as simultaneously operate the high output alternator at 7.2 reduced output. It is also contemplated that other engines 13 having vertically oriented c~rlinders and/or a larger power 3.4 output could also be utilized witb~out departing from the scope 15 of the invention.
16 Zoad management control. is provided by the control 17 relay/voltage regulator combinative 24, 28. The preferred 1s embodiment utilizes an externally mounted microprocessor 19 controlled voltage regulator 28. The voltage regulator 28 is 2o equipped with a reduced power setting, which is typically 2~. uailized to control alternator temperature in a marine 22 environment. Such regulators are availab7.e from BALMAR Corp.
23 of Arlington Virginia, model no. MC-612. The instant invention 24 connects a relay 24 between the positive and negative tex~mirxals 25 of the temperature circuit provi,dsd with the regulator 2s_ 25 When the relay switch 24 is activated, the regulator 28 reduces -~.3-the field cux'xent at the alternatoY 22. Within the instant z invention the control relay 24 ~.s activated during operation of 3 the air conditicaning compressor 12. Activation of the zelay 4 reduces the output of the alternator by approximately So% to reduce the load on the~auxiliary engine lo, thereby allowing a 6 small, engine to operate both systems~simultaneously. As the 7 air conditioner clutch disengages, control relay 24 also opens 8 to allow higher electxiCal production by the alternator 22.
9 Tt should also be noted that o~:her regulators ox regulation methods, well known in the art, that are suitable 11 for controlled reduction of alternator or generator electrical 12 production in response to air conditioner compressor engagement 13 may alternatively be utilized without departing from the scope 14 of the instant invention.
Referring to Fig. 2, an alternative embodiment of the i6 auxiliary power system is illustrated. In this embodi~nnent the 1~ air conditioner compressor cooperates with an under bunk 18 combination air conditioner and heater unit 32. Tn this 19 embodiment the accumulator, expansion valve, evaporator, condenser and air conditioner contro7.s contained within the are 21 under bunk unit. Under bunk heat and air conditioner units for 22 trucks are well known in the art .
23 Referring to Fig.
~, operation of heat system 106 is 2~ illustrated. Durixag operation of the heat system, water used to cool the auxiliary engine 10 ie circulated through a 26 remotely mounted water to air heat exchanger S2 by opening of _14~, 1 a water valve 54_ The engine coolant is tlu~dly coupled X12 to z the heat exchanger located in the evaporatorjheater assembly 15 3 with an outlet 44 coupled to the radiator asseittbly 14 which is 4 then circuJ.ated back to the engirxe 10 by the water pump 40.
T~.~e evaporator/heater fan 17 may be turned on and used to draw 6 air through or across the heat exchanger for increased warming 7 of the truck interior. The electric radiatoxjcondenser fan 26 cycles as required by the temperature switch 2~ to reduce 9 auxiliary engine temperatures. It should be noted that by l0 operating the auxiliary engine at its' optimum RPM~s and 11 operating the alternator at approximately 80~ of full 12 electrical load draw, the engine p.s operated at its most fuel ~.3 efficient level and provides a fast and reliable heat source ~4 for the sleeper area of the truck. The additional amperage draw may be used to power the parking lights, television, c$
16 radio, refrigerator, AC inverter, interior lights and so forth 17 necessary in cold weather operation. It has been found that a 18 block heater provides a unique false load to the engine causing 19 the engine to operate at peak efficiency. The block heater causing the engina temperature to reach its operat~.ng condition 21 quickly while the additional load placed on the engine results 22 quicker temperature increase. Further, the use of a water 23 cooled alternator provides a means to recover heat fax delivery 2~1 to the cab.
Referring to Figs _ 1-3 , gex~eral operation of the auxiliary 26 Bower system will be~described. Upon start up of the auxiliary 1 engine 10, the oz~, pressure within the auxiliary engine is 2 checked via oil pressure switch 20. if sufficient oil pressure 3 is detected vo7.tage is supplied to the auxiliary water pump 40 4 and relay 3~. The auxiliary electrical system becomes active and current from the battery is allowed to flow through line 46 6 of regulator 2s, and the alterxxator 22 begins to deliver 7 electrical power to the battery 38. For. operation of the 8 auxiliary air condition,a.ng system zp2, relay 3.~ is closed to 9 allow electrical curreua.t to f7.ow to the air conditioning control 1B. The air conditioner controls are manipulated by 1.1 the operator, e.g. driver, to control the auxiliary heating 12 system 1,06 and the auxiliary air conditioning_ Should the ~.3 operator desire air conditioning the air conditionirag controls 14 16 are manipulated to cause the compressor 1z to engage the auxiliary engine 10. Simultaneously, the control relay z~
16 closes to cause the voltage regulator z8 to reduce the output 17 of the alternator 22. The air conditioner control also 1.s selectively operates the evaporator/heater fan 17 and the 19 condenser fan 26 as needed. A compressar clutch (not shown) remains engaged as loz~.g as the air conditioner pressure switch 21 48 is closed, causing the compressor to cycle on azxd off as 22 required to achieve the air conditioning control setting.
23 Should the operator desire to operate the auxiliary heat 24 system, the air conditioner controls are manipulated to open the water valve 54 and start the water pump 40_ Water is then 26 forced to flow through the heat exchanger s2 and optionally 1 through the radiator 14 betore returning to the aux~.liary 2 engine 10_ ~'or increased heat, the fan 17 may be operated to 3 increase air flow ever the heat exchanger. In this mode the 4 control re~.ay 24 generally remains open, allowing the S alternator to produce electricity to its full potential_ 6 For purposes of simplification this applicat~.on has been 7 directed to trucks although it would be obvious to one of 8 ordinary skill in the art to recognize that the teachings of 9 this patent and the associated claims may be directed to to buses, boats, ambulances and so forth. Further, alternator 11 changes to address higher voltage systems may be substituted 12 throughout this specification and considered an obvious 13 variation within the scope of the patent. it is to be ~.4 understood that while z have illustrated and described ceri:ain 15 ~ forms of my ixivention, it is not to be limited to the specific 16 forms or arrangement of parts herein described and shown. It 17 will be apparent to thase skilled in the art that various 18 changes may be made without departing from the scope of the 19 ' invent~,on anal the invention is not to be considered limited to 20 what is shown in the drawings and described in the 21 specification.
z2 _17_
8 FIELD OF TIDE T.N~TBrITTON
9 This invention is related to auxiliary power systems, in particular, to an auxiliary power system having a load shedding 12 voltage regulator Which prioritizes air conditioning by 12 reducing electrical power generation to mib.imize auxiliary 13 engine size requirements, thus reducing space and weight 14 requirements for the auxiliary power system.
17 Total fossil fuel waste, and the associated economic 2$ waste, within the trucking industry is staggering. It is 29 estimated that six out of every fourteen hours of truck operation are spent idling. Federal and State laws alike limit 2~, the number of hours that each truck driver can legallar drive a 22 truck in a twenty-four hour period. During the xemainder of 23 the time the driver must rest for the next available driving 24 period. Rest periods are often spent in rest areas, truck stops or along the side of an interstate. Trucks or tractors r 1 are often supplied with a "sleeper" for the driver to spend his 2 or her rest time_ Often the sleeper_ includes modern amenities 3 such as a television, vCR, bvD, satel~.ite dish, refrigerator, 4 air conditioner, coffee maker, even a microwave oven. While such items may run on direct current prov~.ded by an engine 6 mounted alternator, or even alternating current by use of an 7 inverter, the truck engine must rema~.n running to prevent the 8 discharge of the batteries used for starting of the diesel 9 engine. During idle a typ~.cal diesel truck engine will burn 1o about one gallon of diesel fuel per hour. Tn addition to the 1~. cost of the diesel fuel, normal maix~tenance costs to the truck 12 engine axed its associated systems axe increased.
13 Tn order to reduce fuel and maintenance costs, txu.cks Z4 oFten utilize an auxiliary generator to provide electrical z5 power for systems with~.n the truck when the truck's engine is 1G not xwnning. The Applicant is a well known assembler of diesel 17 engine/gerierators packages and has been awarded patents for 18 variov.s arrangements_ U_S. Patent Nvs. 5,765,805, 6,047,942, 29 6,219,638, &,677,68, 6,756,693 and 6,812,582 granted to the 2o Applicant disclose combination engine/generator sets that are 2I -lightweight and of novel space saving configurations, the 22 contents of which are incorporated herein by reference.
23 The prior art also discloses numerous systems by which air 24 conditioning and heating can be provided to the interior of a 25 truck while the main engine is not running. For example, U.S.
z6 Patent No. 4,756,359 discloses an auxia.iary power system that 1 includes an auxila.ary engine, electrical alternator, water 2 pump, air conditioning Compressor and heat exchanger. The heat 3 exchanger is used to receive hot exhaust gases from the auxiliary engine for purposes of heating coolant routed through the truck~a engine.
6 'U.S. Patent No_ 4, 762, 170 discloses an auxiliary po~.ter 7 system for trucks or other heavy duty vehicles. The system 8 includes an auxiliary engine sized to Nimultaneously power an 9 air conditioner compressor and a generator. The cooling system ZO of the auxiliary engine is connected to the cooling system of 1s the truck's engine to keep the truck engine warm ix~ cold 12 weather.
13 U_5. Patent No. 5,528,901 discloses an auxiliary power 14 system which includes an auxiliary engine sized to power an air z5 compressor, a v'ater pump, an A/C compressor and an oil pump_ 16 The system replaces the original. bank of batteries supplied 7.7 with the truck and replaces the OEM electric starter With a 18 pneumatic starter.
19 Problems generally associated with the use of these prior zo art devices relate to size, weight, and placement of the 21 systems. The size of an auxiliary generator is critical for 22 vehicular use. If the overall dimensions are too large, there 23 will be insufficient areas on a truck for which Co place the 24 system. Other problems result from complexity of installation.
25 and the costs associated therewith. Still other problems 26 result from sharing coolant systems. Small engirxes rarely -3 ~~
1 generate enough heat to maintain temperature within a large 2 cooling system such as those supplied with a large truck. As 3 a result of the constant cold cylinder tenzperature the small 4 engine runs inefficiently. Some systems increase the size of the auxiliar~r engine or p7.ace false loads on the auxiliary 6 engines to increase heat transferred tv the large engine's cooling system to maintain higher overall temperatures.
s However, the false loads and oversiaed engizxes decrease the 9 overall efficiency of these systems. Other problems and l0 expense are incurred with the use of water-to-water or water-~l to--oil heat exchangers. The heat exchangers axe expensive, 12 difficult to install, and require each body of fluid to be 13 equipped with an independent pump for fluid circulation.
14 It is also known to vary the output of a generator for specific applications. For example, U.S. Patent No. 4,099,067 s6 discloses a control for diesel-electric motor-generator sets.
17 The device allows temporary overloads to be accommodated 18 without engine lugging by reducing line voltage if an attempt 19 is made to draw more than a preset maximum normal Wattage. The line voltage reduction is accomplished by increasing the 21 vmpedaance of the voltage regulator input circuit when a signal 22 genera7.ly proportional to line voltage and load current exceeds 23 a preset reference signal to wha.ch it is compared.
24 U.S. Patent No. 5,512,813 discloses an A/C generator output controlling apparatus. The control device determines 26 the field current to be supplied to a field~coil on the basis 1 of a voltage deviation between a battery charging vol-tage and 2 a battery target voltage.
3 U.S. Patent No. 5,739,6~~ discloses a vehicle power 4 generating system. The system includes a controller wlxich varies the supply of leading phase current supplied to the 6 power generator. The system is particularly suited fox low 7 RPM, high power generation_ 8 U.S. Patent No. 5,726,559 discloses a synchronous electric 9 pov~r generating apparatus and magnetisation control method.
Advance-phase currents are supplied to stator wir~,dings via 11 semiconductor switching devices by controlling the 12 semiconductor switching devices during power generation. The 13 devzGe and method axe particularly su~.ted to control rotox 14 temperature and reduce magnetic flux in an alternating current power generator.
16 U.S. patent No. 5,726,557 discloses a vehicular power 17 system. The device includes a rotating alternating current 1s machine having polyphase armature coils and a full wave i9 rectifier for rectifying the generated voltage by a plurality of SiC-MOSF~Ts, to give a rectified output to the battery unit.
21 ~'he device also .includes a control device for selectively 22 turning on the plurality of SiC-MOSFETs to raise the generated 23 voltage by short-circuiting and open-circuiting the armature 24 coils on the basis of the phases of voltage generated by the x-otating alternating current machine.
26 These prior art devices are generally geared to maximizing _ _ . ._ -6-:1 the output of a power generating device without overloading ox 2 overcharging the eler_trical system of the vehicle. The engizies 3 utilized to drive these devices are generally of sufficient 4 size to drive the generator at full capacity for extended periods. None of the prior art devices disclose or teach a 6 system which is Constructed to utilize a minimally sized engine 7 to prioritize anal drive alternative loads.
8 Thus, what is xieeded is an auxiliary power system that is 9 lightweight, consv.mes a small space, and may be used to Zo alternatively provide heating, eleetr~.caZ power or air 11 conditioning to the interior of a truck. The auxiliary power 12 system should be capable of shedding low priority demands for ~.3 maximiza,ng power supplied by the auxiliary engine.
1 ST~MA.R7f OF THE INVENTION
2 The instant ~.7rsvention system includes a small diesel 3 engine coupled to an air condit~.oner compressor, a generator or 4 alternator and a combination control xelayJregulator for S maxzmiaing the loads placed on the auxiliary engine. The truck 6 operator is provided with cozitrols ~or selective operation of 7 the auxiliary power system's various features which mar be 8 operated while the truck's main engine is ruiuzing or stopped.
In the preferred embodiment the auxiliary engine is sized so that it is not capable of simultaneous operation of all the I1 auxiliary systems to their max~,mum capacity. In a most 12 preferred embodiment the aux~.liary engine is rated from about 13 three SIP to about eight HP. Such engines are currently 14 available from manufacturers such as KUB~TA, and may have a horizontally or about vertically disposed cylinder_ 16 One embodiment of the auxiliary power system includes a 17 heating system. The heating system includes a water pump which 18 may be electric or mechanically driven by the auxiliary engine .
operator controls permit the water pump to circu~.ate water zo through the auxiliary engine to a sleeper heat exchanger, 21 radiator or both_ The heat exchanger may toe remotely mounted 22 within the interior of the truck to provide heat Within the 23 truck interior, and may further include an electric fan fox 24 forcing air across the heat exchanger to provide additional 2S heat. The fan may be operated via the driver's controls to z6 regulate,the amount o;~ air passed across the heat exchanger to 7. provide warmth to the truck's intet~ior. While the air 2 coz~ditioning compressor is turned off, via the dr~.ver~ s 3 controls, the full capacity of the alternator or generator is 4 available for the higher amp draws txpical of cold weather where diesel engines are harder to start and more electrical 6 accessoxies are ire use . ' 7 During hot weather operation the dri~rer may utilize the 8 controls to start the auxiliaxy engine. The auxiliary engine 9 may then be utilized to operate an air conditioner compressor and related air conditioner system components, whexein the 1z truck interior is kept cool. T.~uring this mode the auxiliary 1.2 engine is also utilized to operate the alternator or generator 13 to replenish power drawn from the truck batteries. 2n order 14 for the auxiliary engine to provide power for both accessories, z5 a control relay/regulator is utilized to switch the input field 16 .of the alternator, thereby reducing alternator output to 17 maximize the power output of the auxiliary engine. Should the z8 truck accessories draw more electrical power than the i9 alternator or generator supply during such a peak demand, the truck batteries operate as a reserve power source. When the 21 air conditioning compressvx cycles off, the control 22 relay/regulator causes the alternator or generator to increase 23 electrical output to replenish the truck batteries and supply 24 electrical power to other accessories. in this manner the power output provided lay the auxiliary engine may be more fully 26 utilized.than in prior art power systems_ ___ _ _ _ . -g-1 Thus, ari objective of the instazlt invention is to teach an 2 auxil~.ary power system for trucks that utilizes a minimally 3 sized engine to selectively operate air conditioning, heating 4 and power generating systems.
Another objective of the instant invention is to teach a 6 minimally sized aux~.li.ary power system for trucks capable of 7 selectively providing air conditioning, heating, and electrical power to the interior area of the truck.
9 Still another objective of the instant invention is to teach dzx auxiliary power system having a control iz relay/regulator constructed and arranged to maximize 1z utilization of the power supplied by the auxiliary engine.
z3 Yet another obj active of the instant invention is to teach 14 an auxiliary power system which includes a control ~.5 relay/regulator constructed and arranged to maximize 16 utilization of power supplied by an auxiliary engine by 1~ controlled reduction of electrical power production fox 18 simultaneous air conditioner compressor operation.
19 Still yet another objective of the instant invent~,on is to teach an auxiliary power system which utilizes existing truck 21 batteries as a power exchanger fox peak accessory leads.
22 Another objective of the invention is to teach an 23 auxi7.iary power system for trucks that captures heat ~rom the 24 engine coolant far warming of the truck interior.
Yet another objective of the invention is to teach the use 26 of an auxiliary power system that is inexpensirre, small in size 1 and lightweight.
2 other objectives and advantages of this ~.~nvention will 3 become apparent fxom the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments 6 of this invention.
8 BRIEF DESCRTPTION OF T~3E DRp,WINGS
9 Figure 1 is a. diagrammatic representation of the instant invention auxiliary power system;
11 Figure 2 is a diagrammatic representation of the instant 12 invention auxiliar~r power system used in conjunction with an 13 under bunk heat~:ng and air condition~.ng system; and 1g Figure 3 is a diagrammatic representation of the instant 1s snventivn auxi~.iary power system in a heat providing mode.
1 DETAILEi7 DESCRIPTION
2 Now referring to Fig. 1, a diagrammatic representation.of 3 one embodiment of the instant invention auxiliary power system 4 10o is illustrated. The auxiliary power system generally S includes an auxiliary engine 20 for selectively providing power 6 to an electrical generation system 1'02, an air conditioning 7 system Z04, and a heating system l05_ 2n the preferred 8 embodiment the auxiliary engine is sized so that it is not capable of simultaneous operation of the air condit~.onir~g to system and the electrical generation system to their respective 1~ full capacities. The auxiliary powez system includes a unique 1z control xelay/regulator combination 24, 28 for reducing ~.3 eJ.ectrical power produced by the electrical generation system 1~ 102 during simultaneous operation of the air conditioning 15 system 10~. This construction and arrangement per~eits the size 16 and weight of the auxiliary power system to be substantially 1'~ smaller than the power systems of the prior art. The 18 arrangement also permits tb.e auxiliary power system to utilize 19 a small single cylinder d~.esel erzgine which requires less 20 frec~ueat oil change intervals than those required by the larger 21 engines of the prior art.
22 Referring to Figs. 1-3, the auxiliary engine to is coupled 23 to a refrigerant compres sor, a . g. air eonditivner compressor 1z 2~ and an alternator 22. The air conditioner compressor is 25 generally an automotive style comQressor which includes a 26 magnetic.elutch, well known. xn the art, suitable for 1 compressing ally of the various refrigerants, also well known iaz 2 the art. In one embodiment the compressor 12 is constructed 3 and arranged to cooperate with the accumulator (not shown), 4 expansion valve (not shown), evaporator 16, condenser 14 and air conditioner coi~trols 18 supplied with a truck.
6 In the preferred embodiment, a high output automotive 7 style alternator 22 is suitably coupled to the auxiliary engine 8 1o for rotation thereof. The alternator 22 may be based on 12 9 volts, 24 volts or other voltage dependax~t upon the trucks l0 electrical system. In an alternative embodiment, a generator ~.1 may be utilized in place of the alternator 22 to provide 12 electrical current to various air conditioner support s3 components and other accessories as well as batteries. The 14 power produced by the alternator is available for operating 1S accessories such as an alternating current inverter 2o 16 connected to standard receptacles 30, a~.lowing the operation of 1~ household appliarsees such as raaors, coffee makers, microwave 18 ovens, alarm clocks, vCR~s and so forth. Further 12 volt 3:9 components and accessor~,es such as parking lights, interior 20 lights, television, CB radio, sound system, refrigerator, and 21 Zike devices, not shown, are all commonly used and require 22 power for operation. Should the power requirements be 23 exceeded, due to peak draw devices such as a microwave oven or 24 coffee maker, the existing truck batteries 38 will. produce the 25 necessary power by operat~.ng as a power sink.
26 in a'most preferred embodiment, a single cylinder iCubota 1 EL 300 AR engine capab~,e of producing about four HP is coupled 2 to a 12,000 BTU air conditioner compressor and a high output 3 alternator 22 of about x.20 amps on a 12 volt system. The size 4 of the Kabota engine and the horizontal orientation of the S cylinder allow the instant invention auxiliary power system 7.00 6 to be packaged into a small and light'vaeight add on device for 7 the trucking industry. Tn an alternative embodiment, a Kubota 8 EA 30o Ns engine capable of producing about seven HP may be 9 coupled to, or rotate an air conditioner compressor at a higher 20 rate, so as to produce about Z6, 000 BTUs of air conditioning as hl well as simultaneously operate the high output alternator at 7.2 reduced output. It is also contemplated that other engines 13 having vertically oriented c~rlinders and/or a larger power 3.4 output could also be utilized witb~out departing from the scope 15 of the invention.
16 Zoad management control. is provided by the control 17 relay/voltage regulator combinative 24, 28. The preferred 1s embodiment utilizes an externally mounted microprocessor 19 controlled voltage regulator 28. The voltage regulator 28 is 2o equipped with a reduced power setting, which is typically 2~. uailized to control alternator temperature in a marine 22 environment. Such regulators are availab7.e from BALMAR Corp.
23 of Arlington Virginia, model no. MC-612. The instant invention 24 connects a relay 24 between the positive and negative tex~mirxals 25 of the temperature circuit provi,dsd with the regulator 2s_ 25 When the relay switch 24 is activated, the regulator 28 reduces -~.3-the field cux'xent at the alternatoY 22. Within the instant z invention the control relay 24 ~.s activated during operation of 3 the air conditicaning compressor 12. Activation of the zelay 4 reduces the output of the alternator by approximately So% to reduce the load on the~auxiliary engine lo, thereby allowing a 6 small, engine to operate both systems~simultaneously. As the 7 air conditioner clutch disengages, control relay 24 also opens 8 to allow higher electxiCal production by the alternator 22.
9 Tt should also be noted that o~:her regulators ox regulation methods, well known in the art, that are suitable 11 for controlled reduction of alternator or generator electrical 12 production in response to air conditioner compressor engagement 13 may alternatively be utilized without departing from the scope 14 of the instant invention.
Referring to Fig. 2, an alternative embodiment of the i6 auxiliary power system is illustrated. In this embodi~nnent the 1~ air conditioner compressor cooperates with an under bunk 18 combination air conditioner and heater unit 32. Tn this 19 embodiment the accumulator, expansion valve, evaporator, condenser and air conditioner contro7.s contained within the are 21 under bunk unit. Under bunk heat and air conditioner units for 22 trucks are well known in the art .
23 Referring to Fig.
~, operation of heat system 106 is 2~ illustrated. Durixag operation of the heat system, water used to cool the auxiliary engine 10 ie circulated through a 26 remotely mounted water to air heat exchanger S2 by opening of _14~, 1 a water valve 54_ The engine coolant is tlu~dly coupled X12 to z the heat exchanger located in the evaporatorjheater assembly 15 3 with an outlet 44 coupled to the radiator asseittbly 14 which is 4 then circuJ.ated back to the engirxe 10 by the water pump 40.
T~.~e evaporator/heater fan 17 may be turned on and used to draw 6 air through or across the heat exchanger for increased warming 7 of the truck interior. The electric radiatoxjcondenser fan 26 cycles as required by the temperature switch 2~ to reduce 9 auxiliary engine temperatures. It should be noted that by l0 operating the auxiliary engine at its' optimum RPM~s and 11 operating the alternator at approximately 80~ of full 12 electrical load draw, the engine p.s operated at its most fuel ~.3 efficient level and provides a fast and reliable heat source ~4 for the sleeper area of the truck. The additional amperage draw may be used to power the parking lights, television, c$
16 radio, refrigerator, AC inverter, interior lights and so forth 17 necessary in cold weather operation. It has been found that a 18 block heater provides a unique false load to the engine causing 19 the engine to operate at peak efficiency. The block heater causing the engina temperature to reach its operat~.ng condition 21 quickly while the additional load placed on the engine results 22 quicker temperature increase. Further, the use of a water 23 cooled alternator provides a means to recover heat fax delivery 2~1 to the cab.
Referring to Figs _ 1-3 , gex~eral operation of the auxiliary 26 Bower system will be~described. Upon start up of the auxiliary 1 engine 10, the oz~, pressure within the auxiliary engine is 2 checked via oil pressure switch 20. if sufficient oil pressure 3 is detected vo7.tage is supplied to the auxiliary water pump 40 4 and relay 3~. The auxiliary electrical system becomes active and current from the battery is allowed to flow through line 46 6 of regulator 2s, and the alterxxator 22 begins to deliver 7 electrical power to the battery 38. For. operation of the 8 auxiliary air condition,a.ng system zp2, relay 3.~ is closed to 9 allow electrical curreua.t to f7.ow to the air conditioning control 1B. The air conditioner controls are manipulated by 1.1 the operator, e.g. driver, to control the auxiliary heating 12 system 1,06 and the auxiliary air conditioning_ Should the ~.3 operator desire air conditioning the air conditionirag controls 14 16 are manipulated to cause the compressor 1z to engage the auxiliary engine 10. Simultaneously, the control relay z~
16 closes to cause the voltage regulator z8 to reduce the output 17 of the alternator 22. The air conditioner control also 1.s selectively operates the evaporator/heater fan 17 and the 19 condenser fan 26 as needed. A compressar clutch (not shown) remains engaged as loz~.g as the air conditioner pressure switch 21 48 is closed, causing the compressor to cycle on azxd off as 22 required to achieve the air conditioning control setting.
23 Should the operator desire to operate the auxiliary heat 24 system, the air conditioner controls are manipulated to open the water valve 54 and start the water pump 40_ Water is then 26 forced to flow through the heat exchanger s2 and optionally 1 through the radiator 14 betore returning to the aux~.liary 2 engine 10_ ~'or increased heat, the fan 17 may be operated to 3 increase air flow ever the heat exchanger. In this mode the 4 control re~.ay 24 generally remains open, allowing the S alternator to produce electricity to its full potential_ 6 For purposes of simplification this applicat~.on has been 7 directed to trucks although it would be obvious to one of 8 ordinary skill in the art to recognize that the teachings of 9 this patent and the associated claims may be directed to to buses, boats, ambulances and so forth. Further, alternator 11 changes to address higher voltage systems may be substituted 12 throughout this specification and considered an obvious 13 variation within the scope of the patent. it is to be ~.4 understood that while z have illustrated and described ceri:ain 15 ~ forms of my ixivention, it is not to be limited to the specific 16 forms or arrangement of parts herein described and shown. It 17 will be apparent to thase skilled in the art that various 18 changes may be made without departing from the scope of the 19 ' invent~,on anal the invention is not to be considered limited to 20 what is shown in the drawings and described in the 21 specification.
z2 _17_
Claims (24)
1. An auxiliary power system for use in trucks comprising:
an auxiliary engine for selectively providing power to an electrical generation system and an air conditioning system, said auxiliary engine being sized so that it is incapable of simultaneous operation of said air conditioning system and said electrical generation system to their respective full capacities;
a control relay/regulator for reducing electrical power supplied by said electrical generation system during simultaneous operation of said air conditioning system, whereby power supplied by said auxiliary engine is maximized.
an auxiliary engine for selectively providing power to an electrical generation system and an air conditioning system, said auxiliary engine being sized so that it is incapable of simultaneous operation of said air conditioning system and said electrical generation system to their respective full capacities;
a control relay/regulator for reducing electrical power supplied by said electrical generation system during simultaneous operation of said air conditioning system, whereby power supplied by said auxiliary engine is maximized.
2. The auxiliary power system according to claim 1 wherein said auxiliary power system includes a heating system.
3. The auxiliary power system according to Claim 2 wherein said heating system includes a water cooled auxiliary engine, a water pump and a remotely mounted heat exchanger, wherein said heat exchanger is mounted within a truck cabin area to selectively provide heat thereto.
4. The auxiliary power system according to Claim 3 wherein said water pump is mechanically driven by said auxiliary engine.
5. The auxiliary power system according to Claim 3 wherein said water pump is electrically driven, wherein said electrically driven water pump may be selectively operated.
6. The auxiliary power system according to Claim 1 wherein said electrical generation system includes an alternator, wherein said alternator is operably coupled to said auxiliary engine for rotation thereof.
7. The auxiliary power system according to Claim 6 wherein said alternator is capable of producing about 120 amperes.
8. The auxiliary power system according to Claim 3 wherein said electrical generation system includes a generator, wherein said generator is operably coupled to said auxiliary engine for rotation thereof.
9. The auxiliary power system according to Claim 6 wherein said generator is capable of producing abort 120 amperes.
10. The auxiliary power system according to Claim 1 wherein said control relay/regulator is externally mounted with respect to said alternator.
11. The auxiliary power system according to Claim 1.
wherein said control relay/regulator is constructed and arranged to reduce electrical production of said electrical generation system by about one half during operation of said air conditioning system.
wherein said control relay/regulator is constructed and arranged to reduce electrical production of said electrical generation system by about one half during operation of said air conditioning system.
12. The auxiliary power system according to Claim 11 wherein said control relay/regulator is constructed and arranged to reduce electrical production of said electrical.
generation system from about 120 amperes to about 60 amperes during operation of said air conditioning system.
generation system from about 120 amperes to about 60 amperes during operation of said air conditioning system.
13. The auxiliary power system according to Claim 10 wherein said regulator is a microprocessor controlled voltage regulator equipped with a half power temperature control circuit.
14. The auxiliary power system according to Claim 13 wherein said regulator is a BALMAR model no. MC-612.
15. The auxiliary power system according to Claim 13 wherein said relay is connected between a positive terminal and a negative terminal provided with said temperature control circuit of said regulator, whereby closing said relay causes said regulator to reduce a field current within said alternator thereby reducing output of said alternator.
16. The auxiliary power system according to Claim 1 wherein said air conditioning system includes a compressor operably connected to said auxiliary engine for selective rotational operation.
17. The auxiliary power system according to claim 16 wherein said compressor includes a magnetic clutch for selective operation of said compressor.
18. The auxiliary power system according to Claim 1 wherein said air conditioner compressor produces about 12,000 BTU and said auxiliary engine produces about four horsepower.
19. The auxiliary power system according to Claim 1s wherein, said engine is a four HP KUBOTA EL 300 AR.
20. The auxiliary power system according to Claim 1 wherein said air conditioner compressor produces about 16,000 BTU and said auxiliary engine produces about seven horsepower.
21. The auxiliary power unit according to Claim 20 wherein said engine is a seven HP KUBOTA EA 300 NB.
22. The auxiliary power system according to Claim 16 wherein said truck includes an air conditioning system, wherein said auxiliary air conditioning system is connected to utilize at least a portion of said truck's air conditioning system.
23. The auxiliary power system according to Claim 22 wherein, said truck air conditioning system includes an accumulator, an expansion valve, an evaporator and a condenser, wherein said auxiliary air conditioning system utilizes said truck accumulator, expansion valve, evaporator and condenser.
24. The auxiliary power system according to Claim 1 including an electrical inverter, wherein said electrical inverter is constructed and arranged to provide alternating electrical power for operation of truck accessories.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/051,429 US20050167090A1 (en) | 2002-01-29 | 2005-02-03 | Load management auxiliary power system |
| US11/051,429 | 2005-02-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2514433A1 true CA2514433A1 (en) | 2006-08-03 |
Family
ID=36764110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002514433A Abandoned CA2514433A1 (en) | 2005-02-03 | 2005-08-03 | Load management auxiliary power system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2514433A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2855209A4 (en) * | 2012-05-31 | 2016-11-23 | Thermo King Corp | Control system for auxiliary power unit of a vehicle |
| US20210101448A1 (en) * | 2019-10-03 | 2021-04-08 | Toyota Jidosha Kabushiki Kaisha | Vehicle-mounted temperature controller |
-
2005
- 2005-08-03 CA CA002514433A patent/CA2514433A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2855209A4 (en) * | 2012-05-31 | 2016-11-23 | Thermo King Corp | Control system for auxiliary power unit of a vehicle |
| US20210101448A1 (en) * | 2019-10-03 | 2021-04-08 | Toyota Jidosha Kabushiki Kaisha | Vehicle-mounted temperature controller |
| US11951806B2 (en) * | 2019-10-03 | 2024-04-09 | Toyota Jidosha Kabushiki Kaisha | Vehicle-mounted temperature controller |
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