IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0140107
(2002-05-08)
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우선권정보 |
DE-0022293 (2001-05-08) |
발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Stevens, Davis, Miller & Mosher
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인용정보 |
피인용 횟수 :
9 인용 특허 :
8 |
초록
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A process for the control of boost pressure of a turbocharger in an internal combustion engine as a function of the density of the ambient air. The internal combustion engine has an exhaust gas turbocharger with control means to control the boost pressure in which the actual boost pressure is determ
A process for the control of boost pressure of a turbocharger in an internal combustion engine as a function of the density of the ambient air. The internal combustion engine has an exhaust gas turbocharger with control means to control the boost pressure in which the actual boost pressure is determined at specific time intervals and compared with assigned values for the desired boost pressure taken from stored compressor characteristics. The boost pressure is adjusted as necessary. The internal combustion engine further comprises an engine control device having a control unit and a data storage unit.
대표청구항
▼
A process for the control of boost pressure of a turbocharger in an internal combustion engine as a function of the density of the ambient air. The internal combustion engine has an exhaust gas turbocharger with control means to control the boost pressure in which the actual boost pressure is determ
A process for the control of boost pressure of a turbocharger in an internal combustion engine as a function of the density of the ambient air. The internal combustion engine has an exhaust gas turbocharger with control means to control the boost pressure in which the actual boost pressure is determined at specific time intervals and compared with assigned values for the desired boost pressure taken from stored compressor characteristics. The boost pressure is adjusted as necessary. The internal combustion engine further comprises an engine control device having a control unit and a data storage unit. vice is a pressure differential valve (45, 52), an inlet (46) of which is connected to a feed line (13) and an outlet (47) of which is connected to r the rear control space (28) of the a pressure compensator (23, 24, 25). 4. The control arrangement as claimed in claim 3, wherein the pressure differential valve (45, 52) is set to a fixed pressure difference and has a movable valve member (48) which is acted on by the feed pressure for opening fluid communication between the feed line (13) and the control space (26) at the pressure compensator (23, 24, 25) and is acted on by the control pressure and by a spring (49) for closing said communication. 5. A control arrangement for supplying pressure medium to at least two hydraulic consumers (14, 15, 16) comprising a variable-displacement pump (10) which is controlled according to required flow and a setting of which is variable as a function of highest load pressure of actuated said hydraulic consumers (14, 15, 16), by a pump controller (11), two displaceable meter-in variable restrictors (17, 18, 19), a first of which is arranged between a feed line (13), which leads from the variable-displacement pump (10), and a first hydraulic consumer (14, 15, 16), and a second of which is arranged between the feed line (13) and a second hydraulic consumer (14, 15. 16), and two pressure compensators (23, 24, 25), a first of which is connected downstream of the first meter-in variable restrictor (17, 18, 19), and a second of which is connected downstream of the second meter-in variable restrictor (17, 18, 19), and a control piston of which is actable on in an opening direction, on a front side, by pressure downstream of the associated meter-in variable restrictor (17, 18, 19), and wherein the control pistons of the pressure compensators (23, 24, 25) are actable on in a closing direction by a control pressure which is present in a rear control space (26), is derived from feed pressure prevailing in the feed line (13) with a valve device (45, 52) and changes with the feed pressure, wherein the rear control spaces (26) of the plurality of pressure compensators (23, 24) are directly connected to one another, so that a same control pressure prevails in the rear control spaces (26) of said pressure compensators (23, 24). 6. A control arrangement for supplying pressure medium to at least two hydraulic consumers (14, 15, 16) comprising a variable-displacement pump (10) which is controlled according to required flow and a setting of which is variable as a function of highest load pressure of actuated said hydraulic consumers (14, 15, 16), by a pump controller (11), two displaceable meter-in variable restrictors (17, 18, 19), a first of which is arranged between a feed line (13), which leads from the variable-displacement pump (10), and a first hydraulic consumer (14, 15, 16), and a second of which is arranged between the feed line (13) and a second hydraulic consumer (14, 15, 16), and two pressure compensators (23, 24, 25), a first of which is connected downstream of the first meter-in variable restrictor (17, 18, 19), and a second of which is connected downstream of the second meter-in variable restrictor (17, 18, 19), and a control piston of which is actable on in an opening direction, on a front side, by pressure downstream of the associated meter-in variable restrictor (17, 18, 19), and wherein the control pistons of the pressure compensators (23, 24, 25) are actable on in a closing direction by a control pressure which is present in a rear control space (26), is derived from feed pressure prevailing in the feed line (13) with a valve device (45, 52) and changes with the feed pressure, further comprising a load signaling line (37), to which the highest load pressure of the hydraulic consumers (14, 15, 16) actuated in each case is input via selection valves (36), and by a valve (51) which opens up fluid communication from the load signaling line (37) to the rear control space (26) of a t least one pressure compensator (23, 24) when a difference between the feed pressure and the highest load pressure falls below a defined level. 7. The control arrangement as claimed in claim 6, wherein said valve between the load signaling line (37) and the rear control space (26) is a nonreturn valve (51) which opens toward said control space (26). 8. A control arrangement for supplying pressure medium to at least two hydraulic consumers (14, 15, 16) comprising a variable-displacement pump (10) which is controlled according to required flow and a setting of which is variable as a function of highest load pressure of actuated said hydraulic consumers (14, 15, 16), by a pump controller (11). two displaceable meter-in variable restrictors (17, 18, 19), a first of which is arranged between a feed line (13), which leads from the variable-displacement pump (10), and a first hydraulic consumer (14, 15, 16), and a second of which is arranged between the feed line (13) and a second hydraulic consumer (14, 15, 16), and two pressure compensators (23, 24, 25), a first of which is connected downstream of the first meter-in variable restrictor (17, 18, 19), and a second of which is connected downstream of the second meter-in-variable restrictor (17, 18, 19), and a control piston of which is actable on in an opening direction, on a front side, by pressure downstream of the associated meter-in variable restrictor (17, 18, 19), and wherein the control pistons of the pressure compensators (23, 24, 25) are actable on in a closing direction by a control pressure which is present in a rear control space (26), is derived from feed pressure prevailing in the feed line (13) with a valve device (45, 52) and changes with the feed pressure. a the control pressure for the rear control space (26) of the first pressure compensator (23, 24) is derived from the pump pressure by a first said valve device (45), and the control pressure for the rear control space (26) of another pressure compensator (25) is derived from the pump pressure by a second said valve device (52), and a priority valve (55), by which, in order to maintain a desired pressure difference across the meter-in variable restrictor (19) arranged upstream of said another pressure compensator (25), and therefore a sufficient a supply of pressure medium to a corresponding prioritized hydraulic consumer (16), in event of delivery quantity of the variable-displacement pump (10) not meeting demand (undersaturation), the control pressure in the rear control space (26) of the first pressure compensator (23, 24) is raisable to above the control pressure in case of saturation. 9. The control arrangement as claimed in claim 8, wherein the priority valve (55) comprises a first port (56), which is connected to the feed line (13), and a second port (57), which is connected to the rear control space (26) of the first pressure compensator (23, 24), and a valve member which, in direction of opening the connection between the first port (56) and the second port (56), is actable on by pressure prevailing in a line section downstream of the meter-in variable restrictor (19) assigned to the prioritized hydraulic consumer (16) and by an additional force, and, in direction of closing the connection between the first port (56) and the second port (57), is actable on by the feed pressure. 10. A control arrangement for supplying pressure medium to at least two hydraulic consumers (14, 15, 16) comprising a variable-displacement pump (10) which is controlled according to required flow and a setting of which is variable as a function of highest load pressure of actuated said hydraulic consumers (14, 15, 16), by a pump controller (11), two displaceable meter-in variable restrictors (17, 18, 19), a first of which is arranged between a feed line (13), which leads from the variable-displacement pump (10), and a first hydraulic consumer (14, 15, 16), and a second of which is arranged between the feed line (13 ) and a second hydraulic consumer (14, 15, 16), and two pressure compensators (23, 24, 25), a first of which is connected downstream of the first meter-in variable restrictor (17, 18, 19), and a second of which is connected downstream of the second meter-in variable restrictor (17, 18, 19), and a control piston of which is actable on in an opening direction, on a front side, by pressure downstream of the associated meter-in variable restrictor (17, 18, 19), and wherein the control pistons of the pressure compensators (23, 24, 25) are actable on in a closing direction by a control pressure which is present in a rear control space (26), is derived from feed pressure prevailing in the feed line (13) with a valve device (45, 52) and changes with the feed pressure, further comprising: a) a valve housing (70) having a valve bore (71), into which an inlet channel (46) and, at an axial distance therefrom, an outlet channel (47) open radially;
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