Hydraulic steering system with input horsepower limiting circuit and increased fan speeds at low engine RPM
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60K-011/04
B60K-011/02
B60K-025/04
B60K-025/00
출원번호
US-0368579
(2006-03-06)
등록번호
US-7360357
(2008-04-22)
발명자
/ 주소
Zahniser,John C.
출원인 / 주소
Parker Hannifin Corporation
대리인 / 주소
Renner, Otto, Boisselle & Sklar, LLP
인용정보
피인용 횟수 :
3인용 특허 :
10
초록▼
A hydraulic system that provides hydraulic fluid to a power steering system of a vehicle at a substantially constant flow rate and can also divert excess hydraulic fluid to the air cooling fan of an associated vehicle at low engine speeds is disclosed. The resulting hydraulic system increases fan sp
A hydraulic system that provides hydraulic fluid to a power steering system of a vehicle at a substantially constant flow rate and can also divert excess hydraulic fluid to the air cooling fan of an associated vehicle at low engine speeds is disclosed. The resulting hydraulic system increases fan speed and increases cooling at low engine speeds while also limiting the input horsepower to one or more driving pumps based at least in part on the outlet pressure of the hydraulic pump unit.
대표청구항▼
What is claimed is: 1. A hydraulic system for use in an associated vehicle having a power steering system comprising: a hydraulic pump unit including first and second fixed displacement pumps and a common drive shaft to drive each of the pumps; a priority valve having an input fluidly connected to
What is claimed is: 1. A hydraulic system for use in an associated vehicle having a power steering system comprising: a hydraulic pump unit including first and second fixed displacement pumps and a common drive shaft to drive each of the pumps; a priority valve having an input fluidly connected to the hydraulic pump, a primary output and a secondary output, wherein the primary output is fluidly connected to the power steering system of the associated vehicle to provide a substantially constant flow of hydraulic fluid to the power steering system, and wherein the secondary output is selectably fluidly connected to a hydraulic motor for a cooling fan of the associated vehicle, wherein the secondary output of hydraulic fluid is selectably fluidly connected to the hydraulic motor based at least in part on a predetermined engine speed. 2. A hydraulic system for use in a vehicle having a power steering system comprising: a hydraulic pump unit including first and second fixed displacement pumps and a common drive shaft to drive each of the pumps; a priority valve having an input fluidly connected to the hydraulic pump, a primary output and a secondary output, wherein the primary output is fluidly connected to the power steering system of the associated vehicle to provide a substantially constant flow of hydraulic fluid to the power steering system, and wherein the secondary output is selectably fluidly connected to a hydraulic motor for a cooling fan of the associated vehicle; and a controller that receives at least one signal from one or more pressure transducers fluidly coupled to the hydraulic pump unit. 3. The system of claim 2, wherein the controller outputs a control signal to a relief valve having a first end in fluid communication with at least one of the first and second fixed displacement pumps. 4. The system of claim 3, wherein the control signal is based at least on an outlet pressure associated with at least one of the first and second fixed displacement pumps. 5. A hydraulic system for use in an associated vehicle having a power steering system comprising: a hydraulic pump unit including first and second fixed displacement pumps and a common drive shaft to drive each of the pumps; a priority valve having an input fluidly connected to the hydraulic pump, a primary output and a secondary output, wherein the primary output is fluidly connected to the power steering system of the associated vehicle to provide a substantially constant flow of hydraulic fluid to the power steering system, and wherein the secondary output is selectably fluidly connected to a hydraulic motor for a cooling fan of the associated vehicle; and a valve fluidly connected between the secondary output of the priority valve and a hydraulic reservoir, wherein the hydraulic fluid reservoir is fluidly connected to at least one inlet of the pumps. 6. The system of claim 5, wherein the valve is operable by a controller that outputs an electrical signal to open and/or close the valve. 7. The system of claim 5, wherein the controller outputs the electrical signal based at least in part on the engine speed of the associated vehicle. 8. The system of claim 5, wherein the valve is a solenoid valve. 9. The system of claim 5 further including a check valve having a first end fluidly connected between the secondary output of the priority valve and the valve and a second end fluidly connected to the hydraulic motor for the cooling fan. 10. The system of claim 9, wherein the check valve is operable to maintain hydraulic pressure to the hydraulic motor for the cooling fan when the valve is an open position. 11. A method for increasing fan speed in a hydraulic system of an associated vehicle having a power steering system, the method comprising: driving first and second fixed displacement pumps having a common drive shaft to each of the pumps with an associated engine; fluidly connecting a priority valve having an outlet of at least one of the first and second pumps, wherein the priority valve includes a primary output and a secondary output, wherein the primary output is fluidly connected to the power steering system of the associated vehicle to provide a substantially constant flow of hydraulic fluid to the power steering system, and wherein the secondary output is selectably fluidly connected to a hydraulic motor for a cooling fan of the associated vehicle; and selectably fluidly connecting the secondary output of the priority valve to the hydraulic motor based at least in part on a predetermined engine speed. 12. A method for increasing fan speed in a hydraulic system of a vehicle having a power steering system, the method comprising: driving first and second fixed displacement pumps having a common drive shaft to each of the pumps with an associated engine; fluidly connecting a priority valve having an outlet of at least one of the first and second pumps, wherein the priority valve includes a primary output and a secondary output, wherein the primary output is fluidly connected to the power steering system of an associated vehicle to provide a substantially constant flow of hydraulic fluid to the power steering system, and wherein the secondary output is selectably fluidly connected to a hydraulic motor for a cooling fan of the associated vehicle; and fluidly connecting a valve between the secondary output of the priority valve and a hydraulic fluid reservoir, wherein the hydraulic fluid reservoir is fluidly connected to at least one inlet of the pumps. 13. The method of claim 12 further including controlling the valve by a controller that outputs an electrical signal to open and/or close the valve. 14. The method of claim 13, wherein the controller outputs the electrical signal based at least in part on the engine speed of the associated vehicle. 15. The method of claim 14, wherein the valve is a solenoid valve. 16. The method of claim 12 further including fluidly connecting a first end of a check valve between the secondary output of the priority valve and the valve and fluidly connecting a second end of the check valve to the hydraulic motor for the cooling fan. 17. The system method of claim 16, wherein the check valve maintains hydraulic pressure to the hydraulic motor for the cooling fan when the valve is an open position. 18. A hydraulic system for use in an associated vehicle having a power steering system, the system comprising: a hydraulic pump unit including first and second fixed displacement pumps and a common drive shaft to drive each of the pumps; priority valve having an input fluidly connected to the hydraulic pump, a primary output circuit and a secondary output circuit, wherein the primary output circuit provides hydraulic fluid to the power steering system of an associated vehicle, and wherein the secondary output circuit provides hydraulic fluid to a hydraulic motor for a cooling fan of the associated vehicle when the vehicle engine speed is substantially at or below a predetermined speed, wherein the secondary output circuit routes the hydraulic fluid to a hydraulic fluid reservoir when vehicle engine speed is above the predetermined speed, wherein the hydraulic fluid reservoir is fluidly connected to at least one inlet of the pumps. 19. The system of claim 18 further including a valve fluidly connected between the secondary output of the priority valve and the reservoir. 20. The system of claim 19 further including a controller that outputs an electrical signal to open and/or close the valve. 21. The system of claim 18 further including a check valve having a first end fluidly connected between the secondary output of the priority valve and the valve and a second end fluidly connected to the hydraulic motor for the cooling fan, wherein the check valve is operable to maintain hydraulic pressure to the hydraulic motor for the cooling fan when the valve is an open position. 22. A method for limiting input horsepower, the method comprising: driving first and second fixed displacement pumps having a common drive shaft to each of the pumps with an associated engine; sensing hydraulic pressure output from each of the first and second displacement pumps with at least one pressure transducer; outputting a signal form the at least one pressure transducer to a controller; controlling a proportional pressure relief valve having a first end fluidly connected to a fan motor; wherein the proportional pressure relief valve limits hydraulic pressure supplied to the fan motor based at least in part on hydraulic pressure output from each of the first and second displacement pumps.
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이 특허에 인용된 특허 (10)
Buschur Jeffrey J., Automotive hydraulic system and method.
Nakamura Keiichi (Kariya JPX) Tanaka Tsuneo (Kariya JPX) Inaguma Yoshiharu (Kariya JPX) Shiratori Harunori (Toyota JPX), Control system for hydraulic tandem pump in motor vehicle.
Desjardins,Yvon Clarence; C?t?,Sylvain Raymond; Doutre,Phillippe Louis; Yetter,James Edward, Electro-hydraulic fan drive cooling and steering system for vehicle.
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