• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1. A method for operating a four-stroke diesel engine for internal combustion with a pneumatic pump at constant pressure by opening the exhaust valve at the end of the expansion process of the combustion products in the engine cylinder when the piston approaches n.m. with its subsequent closure, open the intake valve at the end of the process of exhausting combustion products when the piston approaches the rm. and close it at the end of the fresh charge admission process to the cylinder at the position of the piston in the zone n.m. characterized in that, in order to increase the engine efficiency by automatically and gradually reducing the effective compression ratio from the maximum value in the starting mode CO to the minimum value at elevated conditions, the exhaust valve is closed after the intake valve is closed.
    公开号:SU1131476A3
    申请号:SU802877108
    申请日:1980-02-04
    公开日:1984-12-23
    发明作者:Кюртиль Реми
    申请人:Сосьете Д.Этюд Де Машин Термик С.Э.М.Т. (Фирма)；
    IPC主号:
    专利说明:

    2, a method according to claim 1, characterized in that the exhaust valve is closed at the beginning of the process of admission of fresh charge to the engine cylinder and partially opened at the end of this process.
    3. The method according to claim 1, which is based on the fact that the exhaust valve is kept partially open when the fresh charge is inlet and is supported. live it in this position after closing the intake valve.
    4. Method according to paragraphs. 1-3, characterized in that the inlet valve is closed in the interval between 40 crankshaft rotations to n.m.t. and 10 ° after n.m., and the exhaust valve is closed after the intake is closed after 25-70 crankshaft rotations, preferably 25-45.
    5. Four-stroke diesel engine with a constant pressure supercharged engine with constant pressure, containing at least one cylinder.
    with piston, cylinder head with inlet1476
    and exhaust valves connected respectively to the intake and exhaust manifolds and cams. The intake and exhaust valves are controlled, the exhaust valve control cam being equipped with main and auxiliary lugs, characterized in that in order to increase its efficiency by automatically and gradually reducing the effective the degree of compression from the maximum value in the starting modes to the minimum in the primary modes, the auxiliary protrusion of the exhaust valve control cam is adapted to close Exhaust valve after closing the intake.
    6. The motor according to claim 5, of which is an auxiliary cam protrusion made separately from the main protrusion.
    7. The motor according to claim 5, which is based on the fact that the auxiliary cam protrusion is smoothly mated with the main protrusion.
    one
    The invention relates to mechanical engineering, in particular to engine building, namely to four-stroke diesel engines of internal combustion with supercharging under constant pressure and methods for their operation.
    A known method of operating a four-stroke diesel engine with internal combustion and supercharging at a constant pressure by opening the exhaust valve at the end of the expansion process of the combustion products in the engine cylinder as the piston approaches the n.m. with its subsequent closure, open the intake valve at the end of the process of exhausting combustion products when the piston approaches the TMT and closes it at the end of the process of admission of fresh charge to the cylinder when the piston is in the zone MT. and a four-stroke diesel engine with a supercharged combustion with constant pressure, which implements a known method, containing at least
    one cylinder with a piston, a cylinder head with intake and exhaust valves associated respectively with intake and exhaust manifolds and control cams of the intake and exhaust valves, with the cam. The exhaust valve control is provided with main and auxiliary projections 13.
    However, the known method and engine are not characterized by high efficiency.
    The purpose of the Invention is to increase engine efficiency by automatically and gradually decreasing the effective degree, compressing from a maximum value on start-up modes to a minimum one on elevated modes.
    This goal is achieved in that according to the method of operation of a four-stroke diesel engine of internal combustion with supercharging at constant pressure, by opening the exhaust valve at the end of the expansion process of the combustion products in the engine cylinder when the piston approaches n.m. with its subsequent closure, the opening of the intake valve at the end of the process of exhausting the combustion products at the approach of the piston to the rm. and close it at the end of the fresh charge admission process to the cylinder at the position of the piston in the zone n.m. The exhaust valve is closed after the inlet is closed. valve. Moreover, the exhaust valve is closed at the beginning of the process of admission of fresh charge to the engine cylinder and partially opened at the end of this process. The outlet valve is maintained, partially open when the fresh charge is inlet, and is maintained in that position after the inlet valve is closed. The inlet valve is closed in the interval between 40 ° of the crankshaft rotation to nm. and 10 ° after n.m., and the exhaust valve is closed after closing the intake valve through 25-70 ° rotation of the crankshaft, preferably through 25-45 °. In a four-stroke diesel engine, an internal combustion engine with supercharging at constant pressure, containing at least one cylinder with a piston, a cylinder head with intake and exhaust valves, associated with intake and exhaust manifolds, and control valves of the intake and exhaust valves the exhaust control cam is provided with main and auxiliary protrusions the auxiliary control cam projection of the exhaust valve is arranged to close the exhaust valve after closing the inlet th. The auxiliary cam protrusion may be made separately from the main protrusion or smoothly mated with the main protrusion. FIG. Figure 1 shows the cam lift curves for the intake valve with a separately made auxiliary ledge (L), with a smoothly mated auxiliary ledge (b) depending on the angle of rotation of the crankshaft (8); in fig. 2.- proposed engine; in fig. 3 - exhaust cam with exhaust valve; auxiliary projection is made separately from the main valve. 1,764 bump; in fig. 4 - the same, auxiliary. the thoracic projection smoothly adjoins the main protrusion FIG. 1 is designated: And - height of raising of cams; pct - angle of rotation of the crankshaft; B. - partial lift height of the exhaust control valve cam. The engine contains a cylinder with. a piston (not shown), a cylinder head 1 with intake 2 and exhaust 3 valves connected respectively to the intake 4 and exhaust 5 collectors, and control cams of the intake 2 and exhaust 3 valves, the exhaust control valve 6 being in contact with roller 7 and it is supplied with the main 8 and auxiliary 9 ledges. The auxiliary protrusion 9 is adapted to close the exhaust valve 3 after. close the inlet 2, wherein the protrusion 9 can be made either separately from the main protrusion 8, or smoothly mated with the latter. An additional inlet valve 10 may be installed in the cylinder head 1, which is connected to the intake manifold 4 by means of the pipework 11 and a valve 12 arranged therein for closing the pipeline 11 in elevated conditions. Directly at the outlet of the exhaust valve 3, a fresh charge reserve can be formed by direct by-passing the injection charge to the exhaust manifold 5 without passing through the cylinder. The method is carried out as follows. The exhaust valve 3 is opened. At the end of the expansion process of the combustion products in the cylinder when the piston approaches the n.m.t., the inlet valve 2 is opened at the end of the production process of the combustion products when the piston approaches the VMT.t., it is closed at the end of the process admission of fresh charge to the cylinder at the position of the piston in the zone of m / m, namely: between 40 crankshaft turns to m.t. and 10 after n.m., and close the exhaust valve 3 after closing the intake valve 2 through 25-70 ° rotation of the crankshaft, mainly through 25-45. In this case, in the case of the auxiliary protrusion 9 separately
    权利要求:
    Claims (7)
    [1]
    1. The method of operation of a four-stroke diesel internal combustion engine with supercharging at constant pressure by opening the exhaust valve at the end of the expansion process of the combustion products in the engine cylinder when the piston approaches' n.m.t. with its subsequent closure, opening of the inlet valve at the end of the exhaust process of the combustion products when the piston approaches VMT and closing it at the end of the process of introducing a fresh charge into the cylinder with the piston in the NMT zone, characterized in that, in order to increase the engine efficiency by automatically and gradually decreasing the effective compression ratio from the maximum value at startup to the minimum increased modes, the exhaust valve is closed after closing the intake valve.
    Figure 1
    [2]
    2. The method according to π. 1, characterized in that the outlet valve is closed in the Beginning of the fresh charge admission process in the engine cylinder and partly in its open - end of the process.
    [3]
    3. The method according to p. ^ Characterized in that the exhaust valve is kept partially open at the inlet of a fresh charge and is maintained in this position after closing the intake valve.
    [4]
    4. The method according to PP. 1-3, characterized in that the intake valve is closed in the interval between 40 rotation of the crankshaft to N.M.T. and 10 ° after NMT, and the exhaust valve is closed after the inlet is closed after 25-70 ° of crankshaft rotation, mainly after 25-45 °.
    [5]
    5. A four-stroke constant-pressure supercharged diesel internal combustion engine comprising at least one cylinder with a piston, a cylinder head with intake and exhaust valves associated with the intake and exhaust manifolds, respectively, and cams for controlling the intake and exhaust valves, the cam the control valve of the exhaust valve is equipped with a main and auxiliary protrusions, which entails the fact that, in order to increase its efficiency by automatically and gradually increasing the effective compression ratio from max mal value at starting conditions to the minimum at higher modes, an auxiliary protrusion outlet valve control cam is adapted to closing the exhaust valve after the intake.
    [6]
    6. Engine pop. 5, characterized in that the auxiliary cam protrusion is made separately from the main protrusion.
    [7]
    7. Engine pop. 5, characterized in that the auxiliary protrusion of the cam is smoothly mated with the main protrusion.
    类似技术:
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    同族专利:
    公开号 | 公开日
    ES8103267A1|1981-02-16|
    YU30680A|1985-04-30|
    DE3066223D1|1984-03-01|
    FR2448032B1|1984-08-10|
    DK153235B|1988-06-27|
    KR830002140A|1983-05-23|
    DK153235C|1988-11-21|
    DD148971A5|1981-06-17|
    FI67130C|1985-01-10|
    FR2448032A1|1980-08-29|
    IN153625B|1984-07-28|
    NO800291L|1980-08-06|
    PL126997B1|1983-09-30|
    NO152620C|1985-10-23|
    EP0015791B1|1984-01-25|
    ES488160A0|1981-02-16|
    EP0015791A1|1980-09-17|
    FI67130B|1984-09-28|
    YU42661B|1988-10-31|
    SE8000846L|1980-08-06|
    KR840001288B1|1984-09-07|
    DK49080A|1980-08-06|
    US4424790A|1984-01-10|
    CS75780A2|1989-11-14|
    JPS6329093B2|1988-06-10|
    PL221806A1|1980-10-20|
    AU5523080A|1980-08-14|
    SE445058B|1986-05-26|
    FI800342A|1980-08-06|
    CS270403B2|1990-06-13|
    AU539186B2|1984-09-13|
    JPS55107029A|1980-08-16|
    NO152620B|1985-07-15|
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    US10954869B1|2020-02-18|2021-03-23|Ford Global Technologies, Llc|System and method to reduce engine hydrocarbon emissions|
    CN113202628A|2021-06-02|2021-08-03|北京理工大学|Two-stage low-compression-cycle implementation method, device and detection method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR7902877A|FR2448032B1|1979-02-05|1979-02-05|
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