• 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:
    The invention relates to a method and a device for controlling the engine braking operation of internal combustion engines for motor vehicles, wherein the internal combustion engine is operated with direct injection of the fuel and in the exhaust system, a controllable brake damper for backflow of the exhaust gases is provided in engine braking operation, and further comprising an exhaust gas recirculation device with an upstream of the Brake valve arranged EGR valve and a return line, which connects the exhaust system with the intake system of the engine and controls a defined exhaust gas recirculation amount to the combustion air while driving. In order to avoid critical excess temperatures at the injection valves, it is proposed that in engine braking mode (MB) the EGR valve (13) be controlled more or less depending on operating parameters (n, TE) of the internal combustion engine (1).
    公开号:AT512910A4
    申请号:T397/2012
    申请日:2012-04-02
    公开日:2013-12-15
    发明作者:Rodrigo Chaves；Gottfried Raab；Markus Raup；Lukas Gohm
    申请人:Man Truck & Bus Oesterreich Ag；
    IPC主号:
    专利说明:

    MAN Truck & Bus Austria AG ft »» «9 ·« »# ···» | »3.3876 ATpr i j: i * 1 27.03.2012 ··· ··· * ·. ·· i .. -1 -
    Method and device for controlling engine braking operation on internal combustion engines
    The present invention relates to a method for controlling the engine braking operation of internal combustion engines in motor vehicles according to the preamble of patent claim 1 and to an apparatus for carrying out the method according to the preamble of claim 10.
    In high-compression internal combustion engines with a brake flap in the exhaust system high temperatures can occur in the combustion chambers in overrun mode (engine braking operation), which may possibly be detrimental to the injection valves of the direct injection. From DE 198 47 388 B4 it is known to inject fuel for cooling the injection valves in the engine braking mode.
    The object of the invention is to provide a method by means of which can be counteracted without additional construction costs of overheating in particular the injectors. Furthermore, an advantageous device for carrying out the method is proposed.
    This object is achieved with the features of the independent claims. Advantageous developments of the invention are the subject of the dependent claims.
    According to the invention, it is proposed that in the engine braking mode, the EGR valve of the exhaust gas recirculation device is controlled more or less depending on at least one defined operating parameter of the internal combustion engine in a defined or predetermined manner. Surprisingly, it has been found that the critical temperatures at the injectors can be avoided, whereby the engine braking power is slightly reduced. To be particularly advantageous is to be considered that with existing exhaust gas recirculation device only software changes to an existing control unit are required, whereby the method is possibly also easily retrofitted to existing internal combustion engines.
    MAN Truck & Bus Austria AG 3.3876 AT pr: ::: 27.03.2012 '·· "·· * ·' -2-
    In a particularly simple implementation of the method, the EGR valve can be opened more or less depending on the speed of the internal combustion engine in engine braking operation in a defined and / or predetermined manner, in particular such that different speeds or different speed ranges during engine braking operation different opening degrees of the EGR Valves are assigned. For example, in the case of an EGR flap as an EGR valve, a larger opening angle may be predetermined at a first, high speed than at a comparatively lower speed. The gradual adjustment of the opening degree can be done here, for example, linear, but also in stages. This achieves a relatively simple adaptation to the respectively occurring exhaust gas mass flows and pressure conditions with a preferably higher braking power in the lower speed range and a lower braking power in the higher speed range of the internal combustion engine.
    Alternatively or additionally, depending on the preferably currently preset and / or determined and / or detected temperature of the injection nozzles of the direct injection in engine braking operation, the EGR valve can be opened more or less in a defined or predefined manner, in particular in such a way that different temperatures or temperature ranges the injection nozzles are also associated with different degrees of opening of the EGR valve and / or on reaching a predetermined temperature threshold, the EGR valve is fully opened. For example, it can be provided that from the start of the engine braking operation, the opening gradient of the EGR valve increases with increasing temperature of the injectors until the EGR valve is fully opened when a defined threshold temperature is reached and remains for a predetermined period of time.
    To achieve the highest possible braking performance at the beginning of engine braking operation, the EGR valve can be opened only after a time delay, that is, after a defined time interval, starting from the closing of the brake flap. Thus, the temperature-inertia of the injectors is used until the occurrence of the critical temperature threshold for a full braking power and only then the EGR valve is activated. In principle, however, the EGR valve can already be opened immediately at the beginning of engine braking operation. In a particularly advantageous embodiment of the method can be achieved by a combination of several defined or predetermined operating parameters of
    MAN Truck & Bus Austria AG 3.3876 AT pr Ϊ! 27.03.2012 -3-
    Internal combustion engine, the opening of the EGR valve are controlled so that a defined speed of the internal combustion engine is held in engine braking mode. This is achieved via the EGR valve to a limited extent a speed control of the motor vehicle in overrun mode by (for example, superimposed for temperature control) of the engine braking operation is controlled so that a defined, for example, set via a control system speed is maintained. In this case, a reduction of the braking power via the EGR valve can also be controlled if the set speed or the speed of the internal combustion engine is not to be fallen below.
    Furthermore, a defined amount of fuel can be carried out as auxiliary injection in a manner known per se in engine braking operation via direct injection, wherein this measure can be designed to achieve a higher braking power and / or a temperature reduction at the injection nozzles.
    Specifically, any method of control, e.g. a control unit or a control unit network may be provided, by means of which, inter alia, the EGR valve of the exhaust gas recirculation device is controlled. In the engine braking operation, the control unit or of this can be superimposed on an engine braking operating mode which controls the opening of the EGR valve at least as a function of signals from a rotational speed sensor and / or temperature sensor and the closing of the brake flap in the exhaust system.
    Temperature values of the internal combustion engine and / or the injection valves and / or the intake air can be supplied to the control unit as a temperature signal, it being possible, for example, to provide that the EGR valve can only be opened when a defined temperature threshold value is reached. The temperature values may be taken from temperature models or maps and / or from substitute quantities, e.g. be derived from the speed, and / or in principle be detected by means of temperature sensors.
    Finally, the internal combustion engine can be operated in a conventional manner with turbocharging, wherein the brake flap is positioned before or after the exhaust gas turbine, but downstream of the branching return line of the exhaust gas recirculation device.
    MAN Truck & Bus Austria AG
    ·· II ··· · · mm M 3.3876 ATpr ί ::: 27.03.2012 ........... -4-
    The advantages resulting with the device have already been extensively appreciated, so that in this regard reference is made to the statements made above.
    An embodiment of the invention is explained in more detail below with reference to the accompanying schematic drawing.
    Show it:
    Figure 1 is a block diagram of a multi-cylinder series internal combustion engine with exhaust gas turbocharging and an exhaust gas recirculation device and arranged in the exhaust system with a brake flap for controlling an engine braking operation. and
    2 is a graph showing the engine braking operation, the instantaneous braking power and the temperature profile at the injection valves of the internal combustion engine influenced by the opening of the EGR valve of the exhaust gas recirculation device.
    1 shows an internal combustion engine 1 (for example a diesel engine) with only six cylinders, by way of example, and a direct fuel injection in the combustion chambers thereof via injection valves 2 that are only indicated.
    The internal combustion engine 1 has an exhaust system, which is only partially shown, with an exhaust manifold 3 and an exhaust pipe 4. In the exhaust pipe 4 a controllable via an electronic control unit 5 brake flap 6 is used.
    The internal combustion engine 1 is operated with turbocharging, wherein the exhaust gas turbocharger is integrated with its exhaust gas turbine 7 in the exhaust pipe 4.
    The compressor 8 of the exhaust gas turbocharger sucks in combustion air via an inlet line 9, which is only indicated, and delivers it via a charge pressure line 10 and an intake manifold 11 to the combustion chambers of the internal combustion engine 1.
    Between the exhaust manifold 3 and the intake manifold 11, an exhaust gas recirculation line 12 is provided, in which in addition to an exhaust gas cooler (not shown)
    MAN Truck & Bus Österreich AG 3.3876 AT pr 27.03.2012 »· · · t ··« > ··· • • * 4 * «··" -5-an exhaust gas recirculation (EGR) valve 13 is inserted. The EGR valve 13 is controlled in accordance with operating data of the internal combustion engine 1 via the control unit 5. The EGR valve 13 may, for example, be any shut-off element, e.g. is controlled by a proportional valve.
    The injection nozzles 2 are connected to a fuel injection device (for example, common rail) and injected in the direct injection method, the determined via the control unit 5 amount of fuel. It is understood that the internal combustion engine with its operating equipment, unless otherwise described, may be of conventional design and construction.
    The regular engine braking operation is, for example, via a foot switch (not shown) is activated, wherein the control unit 5, a signal MB is transmitted and this controls the brake flap 6 and closes. In regular engine braking operation, the EGR valve 13 is closed and the fuel injection is interrupted.
    The control unit 5, in addition to numerous operating parameters, the speed n of the internal combustion engine 1 by means of a speed sensor and e.g. model-based or derived from substitute variables or supplied via a, arranged on one of the injectors 2 temperature sensor, the temperature signals TE.
    The control unit 5 software is superimposed with an engine brake operating mode, the activated with engine braking operation and the brake flap 6 depending on the predetermined temperature TE of the injectors 2 and / or depending on the instantaneous speed n of the internal combustion engine 1, the EGR valve 13 gradually or continuously more or less, and further controlling auxiliary injection of fuel via the injectors 2.
    If a defined temperature threshold at the injection valves 2 is reached and / or a defined engine speed n is present in engine braking operation, the EGR valve 13 is opened after the lapse of a defined time interval (short full engine braking power), whereby exhaust gas is returned via the return line 12 and the exhaust gas back pressure upstream of the exhaust valve 13 is lowered along with a reduction in the engine braking power. At the same time, in advance or delayed, the auxiliary injection of fuel can be controlled via the Einsprrtzventile 2 for their additional cooling.
    MAN Truck & Bus Österreich AG · * · * + «··· * · ♦♦ ·· 3.3876 AT pr 27.03.2012 • * tt · · · *« «« · ♦ »« «* I · ·« ·· »« ···································
    The graph according to FIG. 2 shows, for example, the influence of the exhaust gas recirculation in the engine braking operation on the temperature TE of the injection valves 2, as a result of which damaging excess temperatures can be avoided there.
    The solid line MB describes the state of the brake flap 6, which is closed from 0% to 100% by the signal MB to trigger the engine braking operation.
    The dashed line TE shows the subsequent increase in the temperature of the injectors 2, wherein a time interval t may pass before, as indicated by the dotted line 13, the EGR valve 13 is increasingly opened.
    The opening of the EGR valve 13 causes a reduction of the engine braking power according to line MBL and at the same time results in that the temperature TE does not increase any further.
    As stated, the opening of the EGR valve 13 is also influenced by the speed n of the internal combustion engine, so that e.g. It may be provided that the EGR valve 13 continues to be opened up as the rotational speed n increases (not shown in the diagram) and, associated therewith, the exhaust backpressure is further reduced or also kept constant. About the described control of the EGR valve 13 can also be effected in overrun speed control of the motor vehicle in overrun via the control unit 5, this linked with a control system (not shown) a set engine speed n thereby maintains that the EGR -Ventil 13 is more or less controlled in a defined extent.
    It is understood that the temperature threshold at the injection valves 2 has priority and when the temperature threshold is reached, the control function is interrupted.
    With the cancellation of the engine braking operation via the signal MB and by opening the brake flap 6, the EGR valve 13 is initially closed at the same time before the regular operation of the internal combustion engine 1 is controlled again via the control unit 5.
    MAN Truck & Bus Austria AG
    · «·· ···· 9» ··· M «· ·« «·« 3.3876 at pr: ::: 27.03.2012 · .. * · .. ·· .. *: · .. * -7-
    The invention is not limited to the embodiment described.
    Thus, in a simplified embodiment, only the rotational speed signals n may be used in conjunction, possibly with an auxiliary injection, in order to avoid critical excess temperatures at the injection valves 2 during engine braking operation.
    The exhaust gas turbocharging may possibly also take place via a register charge with a low-pressure and a high-pressure exhaust gas turbocharger; if necessary, no turbocharging of the internal combustion engine can be provided.
    Other parameters for controlling the EGR valve 13 of the exhaust gas recirculation device may be sensors for the exhaust gas back pressure upstream of the exhaust valve 6, the exhaust gas temperature, the cylinder inlet temperature, the temperature of the internal combustion engine, etc. Some of these parameters are already stored in conventional control units 5 anyway and evaluated accordingly.
    The control unit 5 may basically be an engine control unit, but is preferably an independent of the engine control unit, electronic control unit with the described inputs n, MB, TE, etc .. • 4 »* · +» ··
    MAN Truck & Bus Österreich AG 3.3876 AT pr 27.03.2012 • «ff ff ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffl -8th-
    REFERENCE SIGNS LIST 1 internal combustion engine 2 injection valves 3 exhaust manifold 4 exhaust gas line 5 control unit 6 brake flap 7 exhaust gas turbine 8 inlet line 9 compressor 10 charge pressure line 11 intake manifold 12 return line 13 exhaust gas recirculation valve n engine speed TE temperature injection valves MB signal engine braking operation MBL engine braking power
    权利要求:
    Claims (11)
    [1]
    MAN Truck & Bus Österreich AG 3.3876 AT pr ί *:: 27.03.2012 · «··· ··· < 1. A method for controlling the engine braking operation of internal combustion engines for motor vehicles, wherein the internal combustion engine is operated with direct injection of the fuel and the exhaust system is provided a controllable brake damper for backflow of the exhaust gases in engine braking operation, and further comprising an exhaust gas recirculation device with an upstream of the brake flap arranged exhaust gas recirculation (EGR) valve and a return line which connects the exhaust system to the intake system of the internal combustion engine and controls a defined exhaust gas recirculation amount to the combustion air, characterized in that in engine braking mode (MB), the EGR valve (13) depending on at least one predetermined operating parameters (n, TE) of the internal combustion engine (1) is controlled, in particular such that the degree of opening or the degree of control of the EGR valve (13) in dependence on the current detected and / or determined value of at least an operating parameter (n, TE) is specified in engine braking operation.
    [2]
    2. The method according to claim 1, characterized in that the EGR valve (13) depending on the speed (n) of the internal combustion engine (1) in the engine braking operation in a defined and / or predetermined manner is opened, wherein it is preferably provided that different speeds or different speed ranges of the engine brake operating phase are assigned different degrees of opening of the EGR valve (13).
    [3]
    3. The method according to claim 1 or 2, characterized in that the EGR valve (13) depending on the, preferably currently predetermined and / or determined and / or detected, temperature (TE) of the injection nozzles (2) of the direct injection in engine braking operation in defined and / or predetermined manner is opened, wherein it is preferably provided that different temperatures (TE) or temperature ranges of the injection nozzles (2) different degrees of opening of the EGR valve (13) are assigned and / or upon reaching a defined temperature (temperature threshold) the EGR valve (13) is fully opened. MAN Truck & Bus Austria AG 3.3876 AT pr 27.03.2012 -10-
    [4]
    4. The method according to any one of the preceding claims, characterized in that the EGR valve (13) is opened only after a defined time interval (t), starting from the closing of the brake flap (6) and thus with a time delay.
    [5]
    5. The method according to any one of the preceding claims, characterized in that by a combination of a plurality of predetermined and / or defined operating parameters of the internal combustion engine (1), the opening of the EGR valve (13) is controlled so that a defined speed (n) the internal combustion engine (1) is held in engine braking operation.
    [6]
    6. The method according to any one of the preceding claims, characterized in that in the engine braking operation via the direct injection (2) a defined amount of fuel is injected as auxiliary injection.
    [7]
    7. The method according to any one of the preceding claims, characterized in that an engine control mode predetermined and / or superimposed on an electronic control unit (5) in the engine braking mode, at least depending on a speed and / or temperature signal and the closing of the brake flap (6) Exhaust system controls the opening of the EGR valve (13).
    [8]
    8. The method according to claim 7, characterized in that the control unit (5) as a temperature signal detected and / or detected temperature values of the internal combustion engine and / or the injection valves (2) and / or the intake air are supplied.
    [9]
    9. The method of claim 7 or 8, characterized in that the internal combustion engine (1) is operated with turbocharging, wherein the brake flap (6) before or after the exhaust gas turbine (7) but downstream of the branching return line (12) of the exhaust gas recirculation device is positioned.
    [10]
    10. An apparatus for carrying out a method for controlling the engine braking operation of internal combustion engines for motor vehicles, in particular according to one of the preceding method claims, with a direct injection-driven internal combustion engine, with a controllable exhaust valve in the exhaust system, with an exhaust gas recirculation system comprising a MAN Truck & Bus Austria AG 3.3876 AT pr 27.03.2012
    [11]
    -11 - return line and arranged upstream of the brake valve EGR valve, wherein the return line connects the exhaust system to the intake system of the internal combustion engine, characterized in that the EGR valve (13) is formed and / or with an electronic control unit (15) is coupled, that in the engine braking operation (11B) in response to at least one predetermined operating parameter (11, Te) of the internal combustion engine is controlled in a defined and / or predetermined manner.
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    同族专利:
    公开号 | 公开日
    CN103362677B|2017-06-09|
    EP3088711A1|2016-11-02|
    EP2647814A3|2014-11-05|
    RU2013112024A|2014-09-27|
    MX2013003602A|2014-04-02|
    MX342542B|2016-10-04|
    CN103362677A|2013-10-23|
    AT512910B1|2013-12-15|
    EP2647814A2|2013-10-09|
    EP3088711B1|2018-11-14|
    BR102013007868A2|2015-06-16|
    US10634068B2|2020-04-28|
    RU2628137C2|2017-08-15|
    US20130255624A1|2013-10-03|
    EP2647814B1|2017-04-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19847388B4|1998-10-14|2008-09-18|Daimler Ag|Fuel injection system with fuel-cooled injectors|
    JP2001280173A|2000-03-31|2001-10-10|Nissan Diesel Motor Co Ltd|Auxiliary brake device|
    JPS5896158A|1981-12-03|1983-06-08|Nissan Motor Co Ltd|Apparatus for controlling exhaust recirculation in internal-combustion engine|
    JPS6347891B2|1984-07-17|1988-09-26|Nippon Denso Kk|
    US6179096B1|1997-11-12|2001-01-30|Diesel Engine Retarders, Inc.|Exhaust brake variable bypass circuit|
    US6283091B1|2000-01-14|2001-09-04|Mack Trucks, Inc.|Method and apparatus for controlling nozzle temperature during engine braking|
    WO2002018761A1|2000-08-29|2002-03-07|Jenara Enterprises Ltd.|Apparatus and method to oprate an engine exhaust brake together with an exhaust gas recirculation system|
    US20030178002A1|2003-02-27|2003-09-25|Israel Mark A.|Apparatus and method to operate an engine exhaust brake together with an exhaust gas recirculation system|
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    AT510236B1|2010-07-26|2015-12-15|MAN Truck & Bus Österreich AG|METHOD FOR MOTOR BRAKING|
    AT510237B1|2010-07-26|2015-12-15|MAN Truck & Bus Österreich AG|METHOD FOR MOTOR BRAKING|DE102013020448A1|2013-12-07|2015-06-11|Daimler Ag|Method for operating a motor vehicle|
    US9422878B2|2014-04-14|2016-08-23|Ford Global Technologies, Llc|EGR operation method and system for increased drivability|
    AT516513B1|2014-12-15|2016-06-15|MAN Truck & Bus Österreich AG|An engine braking device for an internal combustion engine and method for operating an engine braking device|
    US9644545B2|2015-04-24|2017-05-09|GM Global Technology Operations LLC|Control of engine exhaust braking|
    US9988024B2|2015-08-26|2018-06-05|Caterpillar Inc.|Retarder integrated braking system and method|
    DE102017115599A1|2017-07-12|2019-01-17|Man Truck & Bus Ag|Internal combustion engine, in particular as a drive motor for a vehicle|
    法律状态:
    2022-01-15| PC| Change of the owner|Owner name: MAN TRUCK & BUS SE, DE Effective date: 20211123 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA397/2012A|AT512910B1|2012-04-02|2012-04-02|Method and device for controlling engine braking operation on internal combustion engines|ATA397/2012A| AT512910B1|2012-04-02|2012-04-02|Method and device for controlling engine braking operation on internal combustion engines|
    EP16001212.6A| EP3088711B1|2012-04-02|2012-11-16|Method and device for controlling the motor braking operation of combustion engines|
    EP12007763.1A| EP2647814B1|2012-04-02|2012-11-16|Method and device for controlling the engine braking operation of combustion engines|
    RU2013112024A| RU2628137C2|2012-04-02|2013-03-18|Method and device for managing engine braking mode control in internal combustion engines|
    MX2013003602A| MX342542B|2012-04-02|2013-03-27|Method and device for controlling the engine braking operation of combustion engines.|
    BRBR102013007868-9A| BR102013007868A2|2012-04-02|2013-04-01|Method and device for controlling engine brake operation in internal combustion engines|
    US13/854,268| US10634068B2|2012-04-02|2013-04-01|Method and device for controlling the engine braking operation in internal combustion engines|
    CN201310111960.0A| CN103362677B|2012-04-02|2013-04-02|Method and apparatus for controlling the engine braking at internal combustion engine to run|
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