WO2012125798A1 - Start control system using single hydraulic pump - Google Patents
Start control system using single hydraulic pump Download PDFInfo
- Publication number
- WO2012125798A1 WO2012125798A1 PCT/US2012/029185 US2012029185W WO2012125798A1 WO 2012125798 A1 WO2012125798 A1 WO 2012125798A1 US 2012029185 W US2012029185 W US 2012029185W WO 2012125798 A1 WO2012125798 A1 WO 2012125798A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hydraulic
- accumulator
- pump
- combustion engine
- hydraulic pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N7/00—Starting apparatus having fluid-driven auxiliary engines or apparatus
- F02N7/08—Starting apparatus having fluid-driven auxiliary engines or apparatus the engines being of rotary type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines
- B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
- B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
- F02N11/0803—Circuits specially adapted for starting of engines characterised by means for initiating engine start or stop
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines
- B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
- B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
- B60K2006/126—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator the hydraulic accumulator starts the engine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2400/00—Special features of vehicle units
- B60Y2400/46—Engine start hydraulic or electric motors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Definitions
- the present invention relates to start control systems for combustion engine driven hydraulic systems, and more particularly to a start-stop control system utilizing an accumulator to start the combustion engine and stopping the combustion engine when the accumulator is recharged and the hydraulic implements have not been used for a predetermined time.
- Prior art combustion engine driven hydraulic systems generally use an additional starter motor to restart the combustion engine.
- At least one embodiment of the invention provides a start/stop control system comprising: a combustion engine; a hydraulic pump selectively driven by the combustion engine and selectively driving a crankshaft of the combustion engine to start the combustion engine; a hydraulic fluid reservoir supplying fluid to the hydraulic pump; a hydraulic accumulator accumulating hydraulic pressure delivered from the hydraulic pump when the pump is driven by the combustion engine and supplying hydraulic pressure to rotate the pump when the combustion engine has been turned off; at least one hydraulic consumer selectively utilizing hydraulic pressure provided at least by the hydraulic pump; an operator input device connected to an electronic control unit; the electronic control unit selectively stopping and starting the flow of fuel to the combustion engine; the electronic control unit selectively connecting the accumulator to the hydraulic pump in fluid ic communication when the combustion engine is off and the operator input device is actuated, the hydraulic pump starting the combustion engine.
- At least one embodiment of the invention provides a method of operating a start/stop control system comprising the steps of: running a combustion engine to drive a hydraulic pump; pumping hydraulic fluid from a hydraulic reservoir to at least one hydraulic implement and/or charging a hydraulic accumulator; stopping the flow of fuel to the combustion engine when the accumulators are charged and either the at least one hydraulic implement is not being used for a predetermined time or a stop engine command is given by the operator input device; supplying pressurized hydraulic fluid from the accumulator to the hydraulic pump when an operator input device is actuated; rotating a crankshaft of the combustion engine utilizing the hydraulic pump; starting the flow of fuel to the combustion engine such that the rotation of the crankshaft starts the combustion engine.
- FIG. 1 is a schematic of an embodiment of a hydraulic circuit of the present invention
- FIG. 2 is a schematic of a second embodiment of a hydraulic circuit of the present invention utilizing two hydraulic accumulators
- FIG. 3 is a schematic of another embodiment of a hydraulic circuit of the present invention utilizing an overcenter hydraulic pump and utilizing two hydraulic accumulators;
- FIG. 4 is a schematic of another embodiment of a hydraulic circuit of the present invention utilizing an overcenter hydraulic pump utilizing a single hydraulic accumulator. DETAILED DESCRIPTION OF THE DRAWINGS
- a typical hydraulic system is comprised of a hydraulic pump with variable or fixed displacement 12 driven and mechanically linked to an intemal combustion engine 14 to provide flow from a hydraulic reservoir 16 to hydraulic implements or consumers 18.
- the invention adds components to this typical system to allow the intemal combustion engine 14 to be shut off during times when no hydraulic consumer 18 is activated while still being able to instantaneously resume flow to the consumers 18.
- the start/stop cycle begins with the combustion engine 14 running and driving the hydraulic pump 12.
- the pump 12 is providing flow from a reservoir or sump 16, which may or may not be pressurized, through two check valves 20 and 22 to the hydraulic implements 18.
- ECU electronice control unit
- solenoid 24 is energized to switch to an open position. In a system with a variable displacement pump 12 the pumps displacement would then be commanded to provide additional flow for charging an accumulator 30. This is not necessary in a fixed pump system. Instead in a fixed pump system a proportional solenoid 24 may be fully or partially engaged to increase the pressure upstream thus charging the accumulator 30.
- the charge procedure will be monitored by a pressure sensor 32. Once the charge pressure has s reached a satisfactory pressure, the charging process is terminated by de- energizing solenoids 24, 42.
- An additional pressure sensor 34 may be arranged at the accumulator inlet to allow pressure monitoring as accumulator pressure may decay over time under certain temperature conditions.
- the solenoids 42 and 44 are energized.
- the pressurized hydraulic fluid stored in accumulator 50 will discharge to the inlet side of the pump 12 as the check valve 22 prevents flow back to the reservoir 16.
- the flow will then allow the pump 12 to become a motor and driving the crankshaft of the combustion engine 14.
- the discharged fluid from the pump 12 will then recirculate to the hydraulic reservoir 16.
- the solenoid 24 is energized to provide instantaneous flow from the hydraulic accumulator 50 to the hydraulic implements or consumers 18.
- a check valve 20 prevents the flow from taking a path to the pump 16 outlet side.
- the ECU 40 may decide based on the previous accumulator charge pressure to reduce implement flow either through the solenoid 46 or in case of electrical controlled implements 18 by reducing function speed. This is to ensure the pump 12 is generating enough torque to turn the engine over.
- FIG. 2 an embodiment of a start stop control system 110 is shown.
- the embodiment of FIG. 2 differs from FIG. 1 in that it includes a second accumulator 52 and a second pressure sensor 38 associated with the second accumulator 52.
- the second accumulator 52 of system 110 provides a separate source of hydraulic pressure exclusively for the hydraulic consumers 18. This provides an instantaneous response that is not reduced by the flow demand required to start the combustion engine 14 as in the previous embodiment.
- a typical operating cycle of the start/stop systems begins with the combustion engine 14 running the pump 12 which pumps fluid flow from the reservoir 16, which may or may not be pressurized through two check valves 20 and 22 to the hydraulic implements 18.
- the solenoids 24 and 26 are energized to switch to an open position.
- the proportional solenoid 46 then may be fully or partially engaged to increase the pressure upstream charging the accumulators 50 and 52.
- the pressure sensors 34 and 38 are used to monitor the charging state and determine when the charging process is finished. When satisfactory pressure levels have been reached the charging process is terminated by de-energizing all solenoids.
- the solenoids 42 and 44 are energized.
- the pressurized hydraulic fluid stored in accumulator 50 will discharge to the inlet side of the pump 12 as the check valve 22 prevents flow back to the reservoir 6.
- the flow will then allow the pump 12 to become a motor and driving the crankshaft of the combustion engine 14.
- the discharged fluid from the pump 12 will then recirculate to the hydraulic reservoir 16.
- the solenoid 26 is energized to provide instantaneous flow from the second hydraulic accumulator 52 to the hydraulic implements or consumers 18.
- a check valve 20 prevents the flow from taking a path to the pump 12 outlet side.
- FIG. 3 shows the general system layout of another embodiment of the start stop system 210. While the operating principle is similar it utilizes an overcenter pump 12'. Such a pump can maintain its direction of motion while the flow is being reversed. As the pump side downstream towards the hydraulic implements 18 will always see high pressure both under normal operating conditions and in startup mode the check valve 22 in FIG. 2 is being replaced by a solenoid valve 28 in FIG. 3 to be engaged during startup. Also this embodiment utilizes an unpressurtzed reservoir 16' unlike the pressurized reservoirs 16 in the previous embodiments.
- FIG. 4 shows an embodiment of the start stop control system 310 that is similar to the system 210 of FIG. 3, but utilizing a single accumulator 50.
- System 310 utilizes an overcenter pump 12' that can maintain its direction of motion while the flow is being reversed. Therefore the high pressure side of the pump 12' does not have to change when switching between pump and motor modes. Only one solenoid 24 is necessary to discharge the accumulator 50 to the pump outlet In this case the pump will again act as a motor and discharge directly to the reservoir 16'. That is why there will be no need for a pressurized reservoir 16 in this alternative configuration.
- Prior art circuits use an additional starter motor to restart the combustion engine.
- This invention eliminates the need for such an additional motor as it uses the primary system pump for the task.
- the invention allows for a seamless transition from accumulator assisted operation of the implements to pump driven operation through a check valve and pressure monitoring.
- any accumulator in the embodiments could be replaced by multiple accumulators.
- the accumulators may also be used for other functions as long as they retain sufficient charge to start the combustion engine.
- the accumulator may be replaced by some other source of pressurized fluid such as by a hydraulic implement, i.e. such as a boom that is held in an elevated position having potential energy. When the combustion engine is tumed off and needs to be started, the hydraulic implement is lowered and the pressurized fluid is released to rotate the pump and start the combustion engine.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
A start-stop control system and method is provided utilizing a primary pump to both supply pressurized fluid to hydraulic consumers of the system and to charge one or more accumulators. When the accumulator is charged, the system will stop the fuel to the combustion engine when the operator controls of the hydraulic consumers have not been utilized for a period of time or in response to an engine off command. When the operator controls of the hydraulic consumers are again utilized, the accumulator will activate the hydraulic motor to start the combustion engine as well as providing pressurized hydraulic fluid to the hydraulic consumers.
Description
START CONTROL SYSTEM USING SINGLE HYDRAULIC PUMP
CROSS-REFERENCE TO RELATED CASES
[0001] This application claims the benefit of U.S. Provisional Application Serial No. 61/453,313; filed March 16. 2011. the disclosure of which is expressly incorporated herein by reference.
TECHNICAL FIELD
[0002] The present invention relates to start control systems for combustion engine driven hydraulic systems, and more particularly to a start-stop control system utilizing an accumulator to start the combustion engine and stopping the combustion engine when the accumulator is recharged and the hydraulic implements have not been used for a predetermined time.
BACKGROUND
[0003] Prior art combustion engine driven hydraulic systems generally use an additional starter motor to restart the combustion engine.
SUMMARY
[0004] At least one embodiment of the invention provides a start/stop control system comprising: a combustion engine; a hydraulic pump selectively driven
by the combustion engine and selectively driving a crankshaft of the combustion engine to start the combustion engine; a hydraulic fluid reservoir supplying fluid to the hydraulic pump; a hydraulic accumulator accumulating hydraulic pressure delivered from the hydraulic pump when the pump is driven by the combustion engine and supplying hydraulic pressure to rotate the pump when the combustion engine has been turned off; at least one hydraulic consumer selectively utilizing hydraulic pressure provided at least by the hydraulic pump; an operator input device connected to an electronic control unit; the electronic control unit selectively stopping and starting the flow of fuel to the combustion engine; the electronic control unit selectively connecting the accumulator to the hydraulic pump in fluid ic communication when the combustion engine is off and the operator input device is actuated, the hydraulic pump starting the combustion engine.
[0005] At least one embodiment of the invention provides a method of operating a start/stop control system comprising the steps of: running a combustion engine to drive a hydraulic pump; pumping hydraulic fluid from a hydraulic reservoir to at least one hydraulic implement and/or charging a hydraulic accumulator; stopping the flow of fuel to the combustion engine when the accumulators are charged and either the at least one hydraulic implement is not being used for a predetermined time or a stop engine command is given by the operator input device; supplying pressurized hydraulic fluid from the accumulator to the hydraulic pump when an operator input device is actuated;
rotating a crankshaft of the combustion engine utilizing the hydraulic pump; starting the flow of fuel to the combustion engine such that the rotation of the crankshaft starts the combustion engine.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Embodiments of this invention will now be described in further detail with reference to the accompanying drawings, in which:
[0007] FIG. 1 is a schematic of an embodiment of a hydraulic circuit of the present invention;
|00081 FIG. 2 is a schematic of a second embodiment of a hydraulic circuit of the present invention utilizing two hydraulic accumulators;
[0009] FIG. 3 is a schematic of another embodiment of a hydraulic circuit of the present invention utilizing an overcenter hydraulic pump and utilizing two hydraulic accumulators; and
[0010] FIG. 4 is a schematic of another embodiment of a hydraulic circuit of the present invention utilizing an overcenter hydraulic pump utilizing a single hydraulic accumulator.
DETAILED DESCRIPTION OF THE DRAWINGS
[0011] Referring to FIG. 1 , an embodiment of a start control system 10 in accordance with the present invention. A typical hydraulic system is comprised of a hydraulic pump with variable or fixed displacement 12 driven and mechanically linked to an intemal combustion engine 14 to provide flow from a hydraulic reservoir 16 to hydraulic implements or consumers 18. The invention adds components to this typical system to allow the intemal combustion engine 14 to be shut off during times when no hydraulic consumer 18 is activated while still being able to instantaneously resume flow to the consumers 18.
[0012] The start/stop cycle begins with the combustion engine 14 running and driving the hydraulic pump 12. The pump 12 is providing flow from a reservoir or sump 16, which may or may not be pressurized, through two check valves 20 and 22 to the hydraulic implements 18. When an electronic control unit (ECU) 40 determines that engine load and/or required pump flow is low, solenoid 24 is energized to switch to an open position. In a system with a variable displacement pump 12 the pumps displacement would then be commanded to provide additional flow for charging an accumulator 30. This is not necessary in a fixed pump system. Instead in a fixed pump system a proportional solenoid 24 may be fully or partially engaged to increase the pressure upstream thus charging the accumulator 30. The charge procedure will be monitored by a pressure sensor 32. Once the charge pressure has
s reached a satisfactory pressure, the charging process is terminated by de- energizing solenoids 24, 42.
[0013] An additional pressure sensor 34 may be arranged at the accumulator inlet to allow pressure monitoring as accumulator pressure may decay over time under certain temperature conditions.
[0014] When the ECU 40 determines that no hydraulic consumer has been activated by operator command through input devices 36 for a given amount of time or gets an appropriate external command (such as an operator engine kill switch) from the input devices 36, and the accumulator has a satisfactory charging level, the combustion engine 14 will be shut off by stopping the flow of fuel to the engine 14.
[0015] As soon as the ECU 40 determines that hydraulic flow to the implements 18 needs to be resumed due to operator command through the input devices 36, the solenoids 42 and 44 are energized. The pressurized hydraulic fluid stored in accumulator 50 will discharge to the inlet side of the pump 12 as the check valve 22 prevents flow back to the reservoir 16. The flow will then allow the pump 12 to become a motor and driving the crankshaft of the combustion engine 14. The discharged fluid from the pump 12 will then recirculate to the hydraulic reservoir 16. Simultaneously, the solenoid 24 is energized to provide instantaneous flow from the hydraulic accumulator 50 to
the hydraulic implements or consumers 18. A check valve 20 prevents the flow from taking a path to the pump 16 outlet side. As the ECU 40 monitors engine startup, the ECU 40 may decide based on the previous accumulator charge pressure to reduce implement flow either through the solenoid 46 or in case of electrical controlled implements 18 by reducing function speed. This is to ensure the pump 12 is generating enough torque to turn the engine over.
[0016] As soon as the crankshaft speed of the combustion engine 14 is at or near its idle speed the flow of fuel to the combustion engine resumes. At this point the solenoids 42, 44 and 24 are de-energized. The cycle is thus ready to begin again.
[0017] Referring now to FIG. 2, an embodiment of a start stop control system 110 is shown. The embodiment of FIG. 2 differs from FIG. 1 in that it includes a second accumulator 52 and a second pressure sensor 38 associated with the second accumulator 52. The second accumulator 52 of system 110 provides a separate source of hydraulic pressure exclusively for the hydraulic consumers 18. This provides an instantaneous response that is not reduced by the flow demand required to start the combustion engine 14 as in the previous embodiment.
[0018] A typical operating cycle of the start/stop systems begins with the combustion engine 14 running the pump 12 which pumps fluid flow from the
reservoir 16, which may or may not be pressurized through two check valves 20 and 22 to the hydraulic implements 18. The solenoids 24 and 26 are energized to switch to an open position. According to the system condition determined by the ECU 40, the proportional solenoid 46 then may be fully or partially engaged to increase the pressure upstream charging the accumulators 50 and 52. The pressure sensors 34 and 38 are used to monitor the charging state and determine when the charging process is finished. When satisfactory pressure levels have been reached the charging process is terminated by de-energizing all solenoids.
[0019] When the ECU 40 determines that no hydraulic consumer has been activated by operator command through input devices 36 for a given amount of time or gets an appropriate external command and the accumulators have a satisfactory charging level the combustion engine 14 will be shut off by stopping the flow of fuel to the engine.
[0020] As soon as the ECU 40 determines that hydraulic flow to the implements 18 needs to be resumed due to operator command through the input devices 36, the solenoids 42 and 44 are energized. The pressurized hydraulic fluid stored in accumulator 50 will discharge to the inlet side of the pump 12 as the check valve 22 prevents flow back to the reservoir 6. The flow will then allow the pump 12 to become a motor and driving the crankshaft of the combustion engine 14. The discharged fluid from the pump 12 will then
recirculate to the hydraulic reservoir 16. Simultaneously, the solenoid 26 is energized to provide instantaneous flow from the second hydraulic accumulator 52 to the hydraulic implements or consumers 18. A check valve 20 prevents the flow from taking a path to the pump 12 outlet side.
[0021] As soon as the crankshaft speed of the combustion engine 14 is at or near its idle speed the flow of fuel to the combustion engine resumes. At this point the solenoid 44 is de-energized. As the pressure at the pump outlet increases and reaches the desired system pressure as monitored by the pressure sensor 32, the solenoid 42 is disengaged. The check valve 20 opens to provide flow to the consumers 18. The cycle is thus ready to begin again.
[0022] Figure 3 shows the general system layout of another embodiment of the start stop system 210. While the operating principle is similar it utilizes an overcenter pump 12'. Such a pump can maintain its direction of motion while the flow is being reversed. As the pump side downstream towards the hydraulic implements 18 will always see high pressure both under normal operating conditions and in startup mode the check valve 22 in FIG. 2 is being replaced by a solenoid valve 28 in FIG. 3 to be engaged during startup. Also this embodiment utilizes an unpressurtzed reservoir 16' unlike the pressurized reservoirs 16 in the previous embodiments.
[0023] FIG. 4 shows an embodiment of the start stop control system 310 that is similar to the system 210 of FIG. 3, but utilizing a single accumulator 50. The operating principal Is similar to the previous system 10 that also utilizes a single accumulator. System 310 utilizes an overcenter pump 12' that can maintain its direction of motion while the flow is being reversed. Therefore the high pressure side of the pump 12' does not have to change when switching between pump and motor modes. Only one solenoid 24 is necessary to discharge the accumulator 50 to the pump outlet In this case the pump will again act as a motor and discharge directly to the reservoir 16'. That is why there will be no need for a pressurized reservoir 16 in this alternative configuration.
[0024] Prior art circuits use an additional starter motor to restart the combustion engine. This invention eliminates the need for such an additional motor as it uses the primary system pump for the task. In addition to that the invention allows for a seamless transition from accumulator assisted operation of the implements to pump driven operation through a check valve and pressure monitoring.
[0025] It is further noted that any accumulator in the embodiments could be replaced by multiple accumulators. The accumulators) may also be used for other functions as long as they retain sufficient charge to start the combustion engine. It is also possible that the accumulator may be replaced by some other
source of pressurized fluid such as by a hydraulic implement, i.e. such as a boom that is held in an elevated position having potential energy. When the combustion engine is tumed off and needs to be started, the hydraulic implement is lowered and the pressurized fluid is released to rotate the pump and start the combustion engine.
[0026] Although the principles, embodiments and operation of the present invention have been described in detail herein, this is not to be construed as being limited to the particular illustrative forms disclosed. They will thus become apparent to those skilled in the art that various modifications of the embodiments herein can be made without departing from the spirit or scope of the invention.
Claims
CLAIMS 1. A start/stop control system comprising:
a combustion engine;
a hydraulic pump selectively driven by the combustion engine and selectively driving a crankshaft of the combustion engine to start the
combustion engine;
a hydraulic fluid reservoir supplying fluid to the hydraulic pump;
a hydraulic accumulator accumulating hydraulic pressure delivered from the hydraulic pump when the pump is driven by the combustion engine and supplying hydraulic pressure to rotate the pump when the combustion engine has been turned off;
at least one hydraulic consumer selectively utilizing hydraulic pressure provided at least by the hydraulic pump;
an operator input device connected to an electronic control unit;
the electronic control unit selectively stopping and starting the flow of fuel to the combustion engine;
the electronic control unit selectively connecting the accumulator to the hydraulic pump in fluid communication when the combustion engine is off and the operator input device is actuated, the hydraulic pump starting the
combustion engine.
2. The start stop control system of claim 1 further comprising a pressure sensor communicable with the electronic control unit, the pressure sensor monitoring a charging state of the accumulator.
3. The start stop control system as in any one of claims 1-2, further
comprising a plurality of control valves selectively allowing fluid flow from the hydraulic pump to the accumulator, from the accumulator to the hydraulic pump, from the hydraulic pump to the first hydraulic accumulator, from the hydraulic pump to the at least one hydraulic implement, and from the hydraulic pump to the reservoir, as directed by the electronic control unit.
4. The start/stop control system as in any one of claims 1-3, further comprising a pressure sensor communicable with the electronic control unit, the pressure sensor monitoring the pressure at an outlet of the pump.
5. The start stop control system as in any one of claims 1 -4, further comprising at least one check valve preventing flow directly from the
accumulator to the reservoir.
6. The start stop control system as in any one of claims 1-5, further comprising at least one check valve preventing flow directly from the
accumulator to the outlet of the pump.
7. The start/stop control system of claim 1 wherein the hydraulic cylinder is a first hydraulic cylinder and a second hydraulic cylinder, the first and second hydraulic accumulators accumulating hydraulic pressure delivered from the hydraulic pump when the pump is driven by the combustion engine, the first accumulator supplying hydraulic pressure to rotate the pump and the second accumulator supplying hydraulic pressure to the hydraulic consumer, each when the combustion engine has been turned off and the operator input device is actuated.
8. The start/stop control system of claim 7 further comprising a first and second pressure sensor communicable with the electronic control unit, the first pressure sensor monitoring a charging state of the first accumulator and the second pressure monitoring a charging state of the second accumulator.
9. The start stop control system as in any one of claims 7-8, further comprising a plurality of control valves selectively allowing fluid flow from the hydraulic pump to the first accumulator, from the accumulator to the hydraulic pump, from the hydraulic pump to the second accumulator, from at least one of the hydraulic pump and the second accumulator to the at least one hydraulic implement, and from the hydraulic pump to the reservoir, as directed by the electronic control unit.
10. The start/stop control system of claim 8 further comprising a third pressure sensor communicable with the electronic control unit, the third pressure sensor adapted to monitor the pressure at an outlet of the pump.
11. The start/stop control system as in any one of claims 7-10, further comprising at least one check valve preventing flow directly from the first accumulator to the reservoir.
12. The start stop control system as in any one of claims 7-11 , further comprising at least one check valve preventing flow directly from the second accumulator to the outlet of the pump.
13. The start/stop control system of claim 1 , wherein the hydraulic pump is an over-center hydraulic pump.
14. The start/stop control system of claim 13,
wherein the hydraulic cylinder is a first hydraulic cylinder and a second hydraulic cylinder, the first and second hydraulic accumulators accumulating hydraulic pressure delivered from the hydraulic pump when the pump is driven by the combustion engine, the first accumulator supplying hydraulic pressure to rotate the pump and the second accumulator supplying hydraulic pressure to the hydraulic consumer each when the combustion engine has been turned off and the operator input device is actuated; IS a first and second pressure sensor communicable with the electronic control unit, the first pressure sensor monitoring a charging state of the first accumulator and the second pressure sensor monitoring a charging state of the second accumulator;
a plurality of control valves selectively allowing fluid flow between the hydraulic pump and the first accumulator, between the hydraulic pump and the second accumulator, between the second accumulator and the hydraulic implement; and between the hydraulic implement and the hydraulic pump, as directed by the electronic control unit.
15. The start/stop control system as in any one of claims 13-14, wherein the hydraulic reservoir is an unpressurized tank.
16. The start/stop control system as in any one of claims 1-12, wherein the hydraulic pump is a variable displacement pump communicable with the electronic control unit.
17. The start/stop control system as in any one of claims 1-12, wherein the hydraulic pump is a fixed displacement hydraulic pump.
18. The start/stop control system as in any one of claims 1-12, wherein the hydraulic reservoir is a pressurized tank. IS 19. The start/stop control system as In any one of claims 1-18, wherein the system utilizes a single hydraulic pump. 20. A method of operating a start/stop control system comprising the steps of:
running a combustion engine to drive a hydraulic pump;
pumping hydraulic fluid from a hydraulic reservoir to at least one hydraulic implement and/or charging a hydraulic accumulator;
stopping the flow of fuel to the combustion engine when the
accumulators are charged and either the at (east one hydraulic implement is not being used for a predetermined time or a stop engine command is given by the operator input device;
supplying pressurized hydraulic fluid from the accumulator to at least the hydraulic pump when an operator input device is actuated;
rotating a crankshaft of the combustion engine utilizing the hydraulic pump;
starting the flow of fuel to the combustion engine such that the rotation of the crankshaft starts the combustion engine. 21. The method of claim 20, wherein the step of pumping hydraulic fluid from a hydraulic reservoir to at least one hydraulic implement and/or charging a hydraulic accumulator includes the step of charging a first and a second hydraulic accumulator; and the step of supplying pressurized hydraulic fluid from the accumulator to at least the hydraulic pump when an operator input device is actuated includes the step of supplying pressurized hydraulic fluid from the first accumulator to the hydraulic pump and from the second accumulator to the at least one hydraulic implement, when an operator input device is actuated. 22. The method of claim 20 further comprising the step of shutting off the flow of hydraulic fluid from the accumulator to the hydraulic pump when the pressure of the hydraulic fluid leaving the pump reaches a predetermined pressure. 23. The method of claim 20 further comprising the step of stopping the charging of the accumulator when the accumulator is charged to a predetermined level.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201161453313P | 2011-03-16 | 2011-03-16 | |
| US61/453,313 | 2011-03-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012125798A1 true WO2012125798A1 (en) | 2012-09-20 |
Family
ID=45932504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2012/029185 Ceased WO2012125798A1 (en) | 2011-03-16 | 2012-03-15 | Start control system using single hydraulic pump |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2012125798A1 (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012111295A1 (en) | 2012-11-22 | 2014-05-22 | Linde Hydraulics Gmbh & Co. Kg | Drive train of a vehicle |
| EP2770192A2 (en) | 2013-02-22 | 2014-08-27 | Linde Hydraulics GmbH & Co. KG | Check valve assembly in the intake side of a hydrostatic engine that can be operated as a pump and motor with the same direction of rotation |
| WO2015117961A1 (en) * | 2014-02-04 | 2015-08-13 | Dana Italia Spa | Accumulator racks |
| EP2913514A1 (en) * | 2014-02-03 | 2015-09-02 | Liebherr-Hydraulikbagger GmbH | Mobile hydraulic construction machine |
| WO2016020181A1 (en) * | 2014-08-06 | 2016-02-11 | Robert Bosch Gmbh | Hydrostatic drive |
| DE102014215549A1 (en) | 2014-08-06 | 2016-02-11 | Robert Bosch Gmbh | Hydrostatic drive |
| DE102014218419A1 (en) | 2014-09-15 | 2016-03-17 | Robert Bosch Gmbh | Hydrostatic drive |
| DE102014220336A1 (en) | 2014-10-08 | 2016-04-14 | Robert Bosch Gmbh | Machine with a mechanical protective device to cover a structural space |
| US9618014B2 (en) | 2014-02-28 | 2017-04-11 | Caterpillar Inc. | Implement system having hydraulic start assist |
| US9701312B2 (en) | 2013-12-11 | 2017-07-11 | Caterpillar Inc. | Idle reduction engine shutdown and restart system for a machine |
| US9802469B2 (en) | 2014-02-04 | 2017-10-31 | Dana Italia Spa | Hybrid powermode with series hybrid |
| US9932028B2 (en) | 2014-02-04 | 2018-04-03 | Dana Italia Spa | Controller for a series hydraulic hybrid transmission |
| US10215199B2 (en) | 2014-02-04 | 2019-02-26 | Dana Italia Spa | Travel and work functions integrated into a hydraulic hybrid system |
| US10214102B2 (en) | 2014-10-02 | 2019-02-26 | Dana Italia Spa | Dual drive hybrid driveline |
| US10215276B2 (en) | 2014-02-04 | 2019-02-26 | Dana Italia Spa | Series parallel hydraulic hybrid architecture |
| US10220697B2 (en) | 2014-02-04 | 2019-03-05 | Dana Italia Spa | Powerboost hub |
| EP3722617A1 (en) * | 2019-04-08 | 2020-10-14 | Dana Italia S.r.L. | Hydraulic circuit |
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Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012111295A1 (en) | 2012-11-22 | 2014-05-22 | Linde Hydraulics Gmbh & Co. Kg | Drive train of a vehicle |
| EP2735656A1 (en) | 2012-11-22 | 2014-05-28 | Linde Hydraulics GmbH & Co. KG | Drive train of a vehicle |
| CN103836009A (en) * | 2012-11-22 | 2014-06-04 | 林德液压两合公司 | Powertrain system of vehicle |
| US9429170B2 (en) | 2012-11-22 | 2016-08-30 | Linda Hydraulics GmbH & Co. KG | Drive train of a vehicle |
| EP2770192A2 (en) | 2013-02-22 | 2014-08-27 | Linde Hydraulics GmbH & Co. KG | Check valve assembly in the intake side of a hydrostatic engine that can be operated as a pump and motor with the same direction of rotation |
| DE102013101868A1 (en) | 2013-02-22 | 2014-08-28 | Linde Hydraulics Gmbh & Co. Kg | Non-return valve device in the suction side of a hydrostatic engine operated with the same direction of rotation as pump and motor |
| US9701312B2 (en) | 2013-12-11 | 2017-07-11 | Caterpillar Inc. | Idle reduction engine shutdown and restart system for a machine |
| DE102014001369B4 (en) * | 2014-02-03 | 2021-07-01 | Liebherr-Hydraulikbagger Gmbh | Mobile hydraulic construction machine |
| EP2913514A1 (en) * | 2014-02-03 | 2015-09-02 | Liebherr-Hydraulikbagger GmbH | Mobile hydraulic construction machine |
| US9802469B2 (en) | 2014-02-04 | 2017-10-31 | Dana Italia Spa | Hybrid powermode with series hybrid |
| US10247205B2 (en) | 2014-02-04 | 2019-04-02 | Dana Italia Spa | Accumulator racks |
| US10220697B2 (en) | 2014-02-04 | 2019-03-05 | Dana Italia Spa | Powerboost hub |
| US10215276B2 (en) | 2014-02-04 | 2019-02-26 | Dana Italia Spa | Series parallel hydraulic hybrid architecture |
| US10215199B2 (en) | 2014-02-04 | 2019-02-26 | Dana Italia Spa | Travel and work functions integrated into a hydraulic hybrid system |
| US9932028B2 (en) | 2014-02-04 | 2018-04-03 | Dana Italia Spa | Controller for a series hydraulic hybrid transmission |
| WO2015117961A1 (en) * | 2014-02-04 | 2015-08-13 | Dana Italia Spa | Accumulator racks |
| US9618014B2 (en) | 2014-02-28 | 2017-04-11 | Caterpillar Inc. | Implement system having hydraulic start assist |
| WO2016020181A1 (en) * | 2014-08-06 | 2016-02-11 | Robert Bosch Gmbh | Hydrostatic drive |
| CN106536942A (en) * | 2014-08-06 | 2017-03-22 | 罗伯特·博世有限公司 | Hydrostatic drive |
| CN106536942B (en) * | 2014-08-06 | 2018-09-21 | 罗伯特·博世有限公司 | hydrostatic drive |
| DE102014215549A1 (en) | 2014-08-06 | 2016-02-11 | Robert Bosch Gmbh | Hydrostatic drive |
| US10288094B2 (en) | 2014-08-06 | 2019-05-14 | Robert Bosch Gmbh | Hydrostatic drive |
| DE102014215567A1 (en) | 2014-08-06 | 2016-02-11 | Robert Bosch Gmbh | Hydrostatic drive |
| US10161372B2 (en) | 2014-09-15 | 2018-12-25 | Robert Bosch Gmbh | Hydrostatic drive |
| WO2016041685A1 (en) * | 2014-09-15 | 2016-03-24 | Robert Bosch Gmbh | Hydrostatic drive |
| DE102014218419A1 (en) | 2014-09-15 | 2016-03-17 | Robert Bosch Gmbh | Hydrostatic drive |
| US10214102B2 (en) | 2014-10-02 | 2019-02-26 | Dana Italia Spa | Dual drive hybrid driveline |
| DE102014220336A1 (en) | 2014-10-08 | 2016-04-14 | Robert Bosch Gmbh | Machine with a mechanical protective device to cover a structural space |
| EP3722617A1 (en) * | 2019-04-08 | 2020-10-14 | Dana Italia S.r.L. | Hydraulic circuit |
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