Pressure compensated load sense hydraulic system efficiency improvement system and method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F15B-013/02
F15B-011/05
A01G-023/00
출원번호
US-0184192
(2016-06-16)
등록번호
US-10030678
(2018-07-24)
발명자
/ 주소
Stahle, Scott
Takosky, Jonathan M.
Matthews, Christopher
출원인 / 주소
DEERE & COMPANY
대리인 / 주소
Taft Stettinius & Hollister LLP
인용정보
피인용 횟수 :
0인용 특허 :
8
초록▼
A pressure compensated load sense hydraulic system and method is disclosed where a first pressure compensated valve controls flow between a pump and a first function based on a highest function load; and a second pressure compensated valve controls flow between the pump and a second function based o
A pressure compensated load sense hydraulic system and method is disclosed where a first pressure compensated valve controls flow between a pump and a first function based on a highest function load; and a second pressure compensated valve controls flow between the pump and a second function based on the highest function load. First and second operator controls activate the first and second functions, respectively. When the first function is stalled and the second function is activated, the controller closes the first valve to remove the first function load from the load sense circuit and prevent flow to or from the first function. The controller can determine the first function is stalled when a timer exceeds an initialization period. When the controller closes the first valve, it can cycle the first valve between a shutoff period where the valve is closed, and a refresh period where the valve is opened.
대표청구항▼
1. A pressure compensated load sense hydraulic system for a machine, the pressure compensated load sense hydraulic system comprising: a first hydraulic function;a second hydraulic function;a hydraulic pump configured to provide flow to the first and second hydraulic functions;a first pressure compen
1. A pressure compensated load sense hydraulic system for a machine, the pressure compensated load sense hydraulic system comprising: a first hydraulic function;a second hydraulic function;a hydraulic pump configured to provide flow to the first and second hydraulic functions;a first pressure compensated hydraulic valve configured to control flow between the hydraulic pump and the first hydraulic function and restrict flow based on a highest function load where the first hydraulic function has a first function load and the second hydraulic function has a second function load, the highest function load being the greater of the first and second function loads;a second pressure compensated hydraulic valve configured to control flow between the hydraulic pump and the second hydraulic function and restrict flow based on the highest function load;a first operator control configured to generate first control signals to activate the first hydraulic function;a second operator control configured to generate second control signals to activate the second hydraulic function;a controller that receives the first and second control signals;wherein while the first control signals indicate the first hydraulic function is stalled, the controller closes the first hydraulic valve to prevent flow to or from the first hydraulic function and block the first function load from the pump when the second hydraulic function is activated, and the controller reopens the first hydraulic valve to allow flow to or from the first hydraulic function and unblock the first function load from the pump when the second hydraulic function is deactivated. 2. The pressure compensated load sense hydraulic system of claim 1, further comprising: an initialization timer configured to track time since the first hydraulic function was activated each time the first operator control begins to generate the first control signals to activate the first hydraulic function; andwherein the controller determines the first control signals indicate the first hydraulic function is stalled when the initialization timer exceeds an initialization period. 3. The pressure compensated load sense hydraulic system of claim 2, wherein the initialization period is 10 seconds. 4. The pressure compensated load sense hydraulic system of claim 2, wherein when the controller closes the first hydraulic valve while the first control signals indicate the first hydraulic function is stalled and the second hydraulic function is activated, the controller is configured to cycle the first hydraulic valve between a shutoff period during which the first hydraulic valve is closed to prevent flow to or from the first hydraulic function; and a refresh period during which the first hydraulic valve is opened to allow flow to or from the first hydraulic function. 5. The pressure compensated load sense hydraulic system of claim 4, wherein the machine is a skidder, the first hydraulic function is a hydraulic grapple, and the second hydraulic function is a hydraulic boom or a hydraulic arch. 6. The pressure compensated load sense hydraulic system of claim 1, wherein when the controller closes the first hydraulic valve while the first control signals indicate the first hydraulic function is stalled and the second hydraulic function is activated, the controller is configured to cycle the first hydraulic valve between a shutoff period during which the first hydraulic valve is closed to prevent flow to or from the first hydraulic function; and a refresh period during which the first hydraulic valve is opened to allow flow to or from the first hydraulic function. 7. The pressure compensated load sense hydraulic system of claim 6, wherein the shutoff period is 5 seconds, and the refresh period is 1 second. 8. The pressure compensated load sense hydraulic system of claim 1, further comprising a load sense circuit configured to hydraulically couple a load sense relief valve, a hydraulic control of the hydraulic pump, a control port of the first pressure compensated hydraulic valve, and a control port of the second pressure compensated hydraulic valve, the load sense circuit configured to sense the highest function load of hydraulic functions receiving flow from the hydraulic pump. 9. The pressure compensated load sense hydraulic system of claim 8, wherein the first pressure compensated hydraulic valve comprises a first spool valve configured to control flow between the hydraulic pump and the first hydraulic function, and a first pressure compensator configured to restrict flow between the hydraulic pump and the first hydraulic function based on the highest function load; and wherein the second pressure compensated hydraulic valve comprises a second spool valve configured to control flow between the hydraulic pump and the second hydraulic function, and a second pressure compensator configured to restrict flow between the hydraulic pump and the second hydraulic function based on the highest function load. 10. The pressure compensated load sense hydraulic system of claim 9, wherein the first pressure compensator restricts flow between the hydraulic pump and the first hydraulic function based on a pressure balance between the highest function load sensed by the load sense circuit and the first function load; and the second pressure compensator restricts flow between the hydraulic pump and the second hydraulic function based on a pressure balance between the highest function load sensed by the load sense circuit and the second function load. 11. A pressure compensated load sense hydraulic method for a machine comprising a first hydraulic function, a second hydraulic function, and a hydraulic pump that provides flow to the first and second hydraulic functions, the method comprising: controlling flow between the hydraulic pump and the first hydraulic function using a first pressure compensated hydraulic valve based on a highest function load where the first hydraulic function has a first function load and the second hydraulic function has a second function load, the highest function load being the greater of the first and second function loads;controlling flow between the hydraulic pump and the second hydraulic function using a second pressure compensated hydraulic valve based on the highest function load;monitoring first control signals that activate the first hydraulic function;monitoring second control signals that activate the second hydraulic function;determining when the first hydraulic function is stalled;while the first hydraulic function is stalled, closing the first hydraulic valve to prevent flow to or from the first hydraulic function and block the first function load from the pump when the second hydraulic function is activated, and reopening the first hydraulic valve to allow flow to or from the first hydraulic function and unblock the first function load from the pump when the second hydraulic function is deactivated. 12. The pressure compensated load sense hydraulic method of claim 11, wherein determining when the first hydraulic function is stalled comprises: resetting an initialization timer each time the first control signals start or stop activating the first hydraulic function;running the initialization timer while the first control signals continue activating the first hydraulic function; anddetermining the first hydraulic function is stalled when the initialization timer exceeds an initialization period. 13. The pressure compensated load sense hydraulic method of claim 12, wherein the first function initialization period is 10 seconds. 14. The pressure compensated load sense hydraulic method of claim 12, wherein the step of closing the first hydraulic valve while the first hydraulic function is stalled and the second hydraulic function is activated comprises: closing the first hydraulic valve for a shutoff period to prevent flow to or from the first hydraulic function;opening the first hydraulic valve for a refresh period to allow flow to or from the first hydraulic function; andrepeating the closing the first hydraulic valve for a shutoff period and opening the first hydraulic valve for a refresh period steps while the first hydraulic function is stalled and the second hydraulic function is activated. 15. The pressure compensated load sense hydraulic method of claim 14, wherein the machine is a skidder, the first hydraulic function is a hydraulic grapple, and the second hydraulic function is a hydraulic boom or a hydraulic arch. 16. The pressure compensated load sense hydraulic method of claim 11, wherein the step of closing the first hydraulic valve while the first hydraulic function is stalled and the second hydraulic function is activated comprises: closing the first hydraulic valve for a shutoff period to prevent flow to or from the first hydraulic function;opening the first hydraulic valve for a refresh period to allow flow to or from the first hydraulic function; andrepeating the closing the first hydraulic valve for a shutoff period and opening the first hydraulic valve for a refresh period steps while the first hydraulic function is stalled and the second hydraulic function is activated. 17. The pressure compensated load sense hydraulic method of claim 16, wherein the shutoff period is 5 seconds, and the refresh period is 1 second. 18. The pressure compensated load sense hydraulic method of claim 11, further comprising: sensing the highest function load of hydraulic functions receiving flow from the hydraulic pump using a load sense circuit hydraulically coupling a load sense relief valve, a hydraulic control of the hydraulic pump, a control port of the first pressure compensated hydraulic valve, and a control port of the second pressure compensated hydraulic valve. 19. The pressure compensated load sense hydraulic method of claim 18, wherein the first pressure compensated hydraulic valve comprises a first spool valve and a first pressure compensator, and the second pressure compensated hydraulic valve comprises a second spool valve and a second pressure compensator; wherein controlling flow between the hydraulic pump and the first hydraulic function comprises controlling flow between the hydraulic pump and the first hydraulic function using the first spool valve, and restricting flow between the hydraulic pump and the first hydraulic function based on the highest function load using the first pressure compensator; andwherein controlling flow between the hydraulic pump and the second hydraulic function comprises controlling flow between the hydraulic pump and the second hydraulic function using the second spool valve, and restricting flow between the hydraulic pump and the second hydraulic function based on the highest function load using the second pressure compensator. 20. The pressure compensated load sense hydraulic method of claim 19, wherein restricting flow between the hydraulic pump and the first hydraulic function comprises pressure balancing by the first pressure compensator between the highest function load sensed by the load sense circuit and the first function load; andwherein restricting flow between the hydraulic pump and the second hydraulic function comprises pressure balancing by the second pressure compensator between the highest function load sensed by the load sense circuit and the second function load.
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