• 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 present invention relates to a device 1 for monitoring the torque of an internal combustion engine by monitoring the state of the injector. The device 1 comprises an injector connection 24, 25, 26 for connection to an injector 21, 22, 23, a control unit 31, 32 for controlling the injector connection 24, 25, 26, a main processor unit 5 for controlling the control unit, and a signal processing circuit 7. Furthermore, the signal processing circuit comprises lines which pick up the commands issued by the main processor unit 5 and the commands issued by the control unit 31, 32. By combining these two commands, the signal processing circuit 7 forms a combination signal, on the basis of which the main processor unit 5 or a safety processor unit 9 carries out injector status monitoring.
    公开号:CH711076B1
    申请号:CH00570/16
    申请日:2016-04-29
    公开日:2020-12-15
    发明作者:Lorenzen Martin；Klauck Thomas；Langer Boris；Königer Markus；Brasch Marcel
    申请人:Liebherr Elektronik Gmbh；
    IPC主号:
    专利说明:

    The present invention relates to a device for monitoring the torque of an internal combustion engine by monitoring the state of the injector.
    To monitor the operation or to monitor the torque of an internal combustion engine, the information about the injection time of fuel into the internal combustion engine is required in order to determine the effective fuel mass. For this, it is necessary to monitor the injection nozzles (= injectors) with regard to their state, which can switch between open and closed.
    [0003] DE 10 2004 040 926 A1 already discloses a method for operating an internal combustion engine, in which specific properties of an injection device are taken into account when determining a torque of the internal combustion engine. Among other things, reference is also made here to the duration of fuel injection by the injection nozzles (injectors), but without specifically disclosing to what extent the injection time of the injectors can be monitored.
    DE 103 00 194 A1 also deals with a method for monitoring an internal combustion engine, in which the fuel mass injected into the internal combustion engine is required in order to determine a deviation from a target torque of the internal combustion engine. Here, too, however, no embodiment is disclosed that describes a specific implementation of injector status monitoring.
    To calculate the fuel mass that is injected into the internal combustion engine via the injectors, it is typically customary in the prior art to use the injection times in which the injector valve is in an open position to deduce the amount of fuel injected through the injector valve .
    [0006] Conventionally, the control current supplied to the injector, which causes the nozzle to open, is determined using two separate and independent current measurement paths in order to determine the injection times of an injector. This type of determination of the injection times incurs high component costs, since the evaluation of the flows is complex and resource-intensive.
    In addition, it is necessary that a circuit for controlling the injector meets certain safety requirements. It is particularly advantageous if ISO standard 13849 and ISO standard 26262, both standards for safety-relevant electrical / electronic systems in machines, motor vehicles, are met.
    Accordingly, it is the object of the present invention to implement an inexpensive and resource-saving implementation of an injector control which meets particularly high safety requirements (preferably ISO standard 26262 and ISO standard 13849).
    [0009] The present object is achieved by the device according to the invention for monitoring the torque of an internal combustion engine by monitoring the state of the injector.
    Here, the device comprises an injector connection for connecting to an injector which is designed to inject fuel into a combustion chamber of the internal combustion engine, a control unit for controlling the injector connection, a main processor unit for controlling the control unit, the main processor unit with the control unit via a first command line and the control unit is connected to the injector connection via a second command line. The apparatus further comprises a signal processing circuit connected to the first command line via a first line and to the second command line via a second line to form a combination signal that combines control signals from the first command line and the second command line, the signal processing circuit via a data line is connected to the main processor unit. In addition, the main processor unit is designed to evaluate the combination signal in relation to a period of time during which the fuel can be injected into the combustion chamber via the injector. The main processor unit is designed to monitor the torque of the internal combustion engine based on the evaluation of the combination signal and to initiate a suitable measure or to output an error in the event of a deviation from a target state.
    An injector is preferably an injection nozzle through which fuel can be fed into a combustion chamber of the internal combustion engine. Typically, the injector is in communication with the combustion chamber, in which the combustion process of an engine takes place, and a pressurized fuel reservoir. Depending on the state of the injector, fuel is injected into the combustion chamber via the injector or not. The amount of fuel injected is of great importance for the engine output or the torque produced by the engine.
    Preferably, a space in an engine is provided as the combustion chamber, which is delimited, inter alia, by a cylinder piston, an inlet valve and an outlet valve and the inner walls of a cylinder. The combustion process of the fuel supplied by the injector takes place in the combustion chamber, which is the basis for driving the engine.
    The control unit is preferably suitable for controlling an injector. For this purpose, the control unit sends injector-specific control signals to the injector connection. The control unit is connected to the injector connection via a second command line. In the event that an injector is connected to the injector connection, the control signals output by the control unit can be used to switch the valve position of the injector. The flow of fuel into the combustion chamber can be controlled by opening and closing the valve. The control unit is preferably to be seen as a partial functional element of the device.
    Furthermore, the control unit converts received commands for controlling an injector into a data and / or signal format that the injector can understand. The control unit preferably converts the control commands into a current profile that is specified by an injector manufacturer for controlling an injector. The injector current is also preferably regulated according to the step-down converter principle. In this case, the control unit sends either the supply voltage or a boost voltage to an injector in a pulsed manner via the control unit, with the pulsed control being integrated into an almost constant current at the injector.
    The main processor unit is designed to send a control signal for an injector via a first command line connected to the control unit. In addition, the main processor unit (main computer) is designed to generate the digital signals by which the injection times for a respective injector are specified. The main computer is usually a microcontroller or a comparable data processing unit.
    The signal processing circuit, which is connected to each of the lines for controlling an injector between the main processor unit and the control unit and which is connected to each line that runs from the control unit to an injector connection or to an injector, is designed to to form a combination signal from the various control signals (the signals between the main processor unit and the control unit and the signals between the control unit and an injector) which is sent to the main processor unit via a data line for evaluation.
    For the essence of the invention, the exact generation of the combination signal from the various signals that the signal processing circuit picks up is not important. Rather, it is important that with the help of the various signals tapped from the different points in the device (between main processor unit and control unit and between control unit and injector) a combined signal is generated that is passed on to the main processor unit for evaluation in relation to the injection time of an injector becomes. It is clear to the person skilled in the art that there are several possibilities for implementing this procedure in the signal processing circuit, all of which achieve the same desired effect.
    Furthermore, the main processor unit is designed to evaluate the combination signal received by the signal processing circuit in relation to the injection time of fuel into the combustion chamber by an injector. It is advantageously assumed here that the state of an injector can only change between an open state and a closed state. In addition, it is advantageously assumed that when the injector is open, fuel flows into the combustion chamber. With these assumptions it is possible to determine the effective amount of fuel on the basis of the injection time, i.e. to measure the time during which the injector is open or closed. The engine torque or the engine power can be monitored by measuring the injection time or by inferring the amount of fuel injected from this.
    The concept of the invention also encompasses the fact that the device can have more than one injector connection. The device can also have a separate line between the individual components for each injector connection, but this does not necessarily have to be the case.
    The device has the advantage that the entire signal chain from the control signal of the main processor unit can be monitored via the signal output by the control unit to an injector connection or to an injector.
    The safety-relevant signal for monitoring the device is formed in the signal processing circuit, with the result that all signal paths that are connected to the signal processing circuit are safety-relevant and are subject to special safety regulations. Conversely, however, this means that there are no specific safety requirements for the individual components in the control path (main processor unit, control unit), since a possible error would come to light directly through the evaluation of the combination signal. In addition, the control software that generates the injector signals in the main processor unit is not subject to any safety requirements. Only the software in the main processor unit, which monitors the injector status signal (combination signal), bears the safety burden.
    This makes it possible to install inexpensive standard components and to reduce development time and costs, since complex hardware components and software functions do not have to meet any specific safety requirements.
    The device according to the invention also makes it possible to check all components in the signal chain (control unit and main processor unit) individually for malfunctions. As a result, almost 100% of all possible errors occurring in a component (single-point errors) as well as latent errors can be detected.
    It is thus possible, based on an injection time evaluation in the main processor unit, to diagnose an additional injection pulse, an injection pulse that is too long and a permanent injection pulse of an injector and to determine a possible source of error in the control path.
    Another advantageous, optional feature of the device is a safety processor unit, which is connected to the signal processing circuit via a separate data line and is designed to the combination signal in relation to a period of time during which the fuel via an injector connected to the injector port into the Combustion chamber is injectable to evaluate.
    This further improves system security, since the security-relevant evaluation of the injection times can be carried out both by the main processor unit and by the security processor unit. So it is still possible to continue evaluating the injection times even if one of the two processor units fails. The evaluation process in the security processor unit does not essentially differ from the evaluation process in the main processor unit. Accordingly, the combination signal that is generated in the signal processing circuit is also given to the security processor unit.
    [0027] More preferably, an injector for injecting fuel into a combustion chamber is connected to the injector connection. An associated injector is preferably connected to each existing injector connection.
    The injector connected to the injector connection obtains its control signals from the injector connection and opens / closes its valve according to a signal obtained via the injector connection.
    Another advantageous feature of the control unit is that it is designed to convert a control command received from the main processor unit into a corresponding current profile for an injector to be connected to the injector connection. The injectors must be controlled with a current profile specified by the injector manufacturer. The control unit takes on the conversion of control commands that are issued by the main processor unit and are not in an injector manufacturer-specific format, so that they are converted into an injector-specific current profile according to the desired behavior.
    Since a closed circuit is necessary for the current profile, there is also an associated additional injector connection for each injector connection, which is used to form the circuit. This further injector connection or these further injector connections are connected to the control unit, preferably to an output stage bank.
    [0031] The control command output by the main processor unit preferably specifies an injection time for the injector.
    The control unit preferably comprises an output stage bank and an intelligent gate driver, the intelligent gate driver being connected to the main processor unit and the output stage bank being connected to the injector. The output stage bank and the intelligent gate driver are preferably connected to one another via a command line. Advantageously, the command line for the transmission of information in both directions is designed both from the intelligent gate driver in the direction of the output stage bank and from the output stage bank in the direction of the intelligent gate driver.
    Another advantageous feature of the present invention is that the injector can be a diesel injector, a gasoline injector, a gas injector and / or a piezo injector. It is clear to a person skilled in the art that the present device according to the invention has advantages for various fuels or types of internal combustion engines and can therefore be used in a wide range of applications.
    The invention is not limited to the control of only a single injector connection, but rather is to be understood to the effect that several injector connections are available for a corresponding number of injectors. As a result, the number of lines between the individual components can vary, but this does not necessarily have to be the case. It is entirely conceivable that the number of lines between the individual components does not correspond to the number of injector connections.
    [0035] Further features, possible applications and advantages of the invention emerge from the following description of an exemplary embodiment which is shown in the figure. Here shows:<tb> Fig. 1: <SEP> a block diagram of a device for monitoring the torque of an internal combustion engine by means of an injector status monitoring system according to the invention.
    1 shows a device 1 for monitoring the torque of an internal combustion engine by monitoring the state of the injector. The device has injector connections 24, 25, 26 which are connected to a respective injector 21, 22, 23. Commands for the position of the injectors 21, 22, 23 are transmitted via these injector connections 24, 25, 26, so that, according to the transmitted commands, the respective injector 21, 22, 23 is either in a closed or in an open position. So fuel is supplied to the combustion chamber or the fuel supply is blocked.
    Furthermore, the device 1 has three further connections 27, 28, 29, each of which is connected to a respective injector 21, 22, 23. Each of the injectors thus has a connection to one of the injector connections 24, 25, 26 as well as a connection to one of the further connections 27, 28, 29. The current required to switch an injector 21, 22, 23 flows from the injector connection 24, 25, 26 through the respective injector 21, 22, 23 and then through the associated further connection 27, 28 29. That is, with the aid of the injector connection 24, 25, 26 a certain flow is generated through an injector 21, 22, 23, which flows back into the device 1 through the further connections 27, 28, 29. With the aid of the further connections 27, 28, 29, a circuit through an injector 21, 22, 23 is formed.
    It is clear to the person skilled in the art that the exact number of injectors 21, 22, 23 controlled by the device 1 is of secondary importance. An embodiment with more or less than three injectors 21, 22, 23 is also conceivable, in which the corresponding components that are required per injector 21, 22, 23 are adapted to the changed number of injectors 21, 22, 23. In particular, this also means the number of lines present per injector that run between the components.
    The device further comprises a main processor unit 5 from which a separate first command line 61, 62, 63 emanates for each of the three injectors 21, 22, 23.
    This first command line 61, 62, 63 for each of the injectors 21, 22, 23 or for each of the injector connections 24, 25, 26 is connected to the control unit 31, 32 comprising the intelligent gate driver 32 and the output stage bank 31 . A third command line, which allows a bidirectional exchange of information between the intelligent gate driver and the output stage bank, is arranged between the intelligent gate driver 32 and the output stage bank 31. The output stage bank 31 is also connected to each of the injector connections 24, 25, 26 via a second command line 41. In addition, the output stage bank has separate further lines which are connected to the further connections 27, 28, 29. Which of the three injectors 21, 22, 23 is switched is controlled via a circuit between the connections 24, 25, 26 and the associated further connections 27, 28, 29. The injectors are switched by a specific current profile.
    In addition, the device 1 has a signal processing circuit 7, which receives the information sent via the second command line 41 via a second line 14. The signal processing circuit 7 also receives all signals which are transmitted via the first command line 61, 62, 63 between the main processor unit 5 and the control unit 31, 32. For this purpose, it has a separate first line 11, 12, 13 for receiving the information for each line between main processor unit 5 and control unit 31, 32.
    A data line 8, which is connected to the main processor unit 5, extends from the signal processing circuit 7. A combination signal generated in the signal processing circuit 7 is sent via this data line, which consists of a combination of the information transmitted between the main processor unit 5 and the intelligent gate driver 32 and between the output stage bank 31 and the injector connection 24, 25, 26 or the corresponding injector 21, 22, 23, are transferred.
    Furthermore, a security processor unit 9 can be seen, which is connected to the signal processing circuit 7 via a separate data line 10. The same combination signal as to the main processor unit 5 is sent via the separate data line 10. An evaluation of the combination signal for monitoring the circuit for injector control can then be carried out both in the main processor unit 5 and in the safety processor unit 9.
    The advantage of this embodiment is that the principle of monitoring is very simple, since there is only one digital signal per injector bank (in FIG. 1 three injectors form one injector bank), which is transmitted by the main processor unit 5 and / or the security processor unit 9 needs to be monitored. Furthermore, it is possible to detect almost 100% of all possible single-point errors as well as all latent errors, since in a moment comparison by an injection time evaluation, for example, an additional pulse emitted by the injector that does not occur in parallel within an injector bank Injector or a permanent pulse emitted by an injector is recognizable and the potential source of error can be deduced.
    Due to the good diagnostic options, inexpensive standard components without special safety features can be used for the control path (main processor unit 5, intelligent gate driver 32 and output stage 31).
    From this it follows that there are no specific safety requirements, in particular no ASIL (Automotive Safety Integrity Level) for these components in the control path, which leads to a significant reduction in the workload during development. The control software, which generates the signals for controlling the injectors in the main processor unit 5, also has no security burden. Only the software that monitors the injector status signal bears the safety burden. Depending on the embodiment of the invention, this monitoring can be carried out in the main processor unit 5 and / or in the security processor unit 9.
    As a result, development time and development costs can be saved in this way, since complex hardware components which are subject to a safety regulation and corresponding software functions are only necessary in certain units. It is therefore possible to meet ISO standard 26262 and ISO standard 13849 in the hardware components without any major effort. Only the safety-relevant components and the safety-relevant software units are subject to the requirements of the ISO standards. As a result, large parts of the control path do not have to be subject to the standard, but the overall device fulfills them.
    The invention is not limited to engines (internal combustion engines) of a specific type. Rather, it is clear to the person skilled in the art that the invention is suitable for engines with diesel, gasoline, gas or piezo injectors. In addition, the monitoring concept according to the invention can also be transferred to alternative circuit topologies.
    权利要求:
    Claims (7)
    [1]
    1. Device (1) for torque monitoring of an internal combustion engine by means of injector status monitoring, comprising:an injector connection (24, 25, 26) for connection to an injector (21, 22, 23) which is designed to inject a fuel into a combustion chamber of the internal combustion engine,a control unit (31, 32) for controlling the injector connection,a main processor unit (5) for controlling the control unit (31, 32), the main processor unit (5) being connected to the control unit (31, 32) via a first command line (61, 62, 63), andwherein the control unit for controlling the injector connection (24, 25, 26) is connected to the injector connection (24, 25, 26) via a second command line (41),marked bya signal processing circuit (7) connected to the first command line (61, 62, 63) via a first line (11, 12, 13) and to the second command line (41) via a second line (14), for forming a Combination signal which combines control signals from the first command line (61, 62, 63) and the second command line (41), the signal processing circuit (7) being connected to the main processor unit (5) via a data line (8), whereinthe main processor unit (5) is designed to evaluate the combination signal in relation to a period of time during which the fuel can be injected into the combustion chamber via an injector (21, 22, 23) connected to the injector connection (24, 25, 26)wherein the main processor unit (5) is designed to monitor the torque of the internal combustion engine based on the evaluation of the combination signal and to initiate a suitable measure or to output an error in the event of a deviation from a target state.
    [2]
    2. Device (1) according to claim 1, further comprising a safety processor unit (9) which is connected to the signal processing circuit (7) via a separate data line (10) and is designed to generate the combination signal with respect to a time period during which the fuel can be injected into the combustion chamber via an injector (21, 22, 23) connectable to the injector connection (24, 25, 26).
    [3]
    3. The device (1) according to claim 1, wherein the control unit (31, 32) is designed to transfer a control command received from the main processor unit (5) into an injector (21, 21) connected to the injector connection (24, 25, 26). 22, 23) to convert the corresponding current profile.
    [4]
    4. Device (1) according to claim 3, wherein the control command issued by the main processor unit (5) specifies an injection time for the injector (21, 22, 23) connected to the injector connection (24, 25, 26).
    [5]
    5. Device (1) according to one of the preceding claims, wherein the control unit (31, 32) comprises an output stage bank (31) and an intelligent gate driver (32), wherein the intelligent gate driver (32) with the main processor unit (5 ) is connected and the output stage bank (31) is connected to the injector connection (24, 25, 26).
    [6]
    6. The device (1) according to claim 5, wherein the output stage bank (31) and the intelligent gate driver (32) are connected to one another via at least one third command line (33), the command line preferably being designed for the transmission of information in both directions .
    [7]
    7. Device (1) according to one of the preceding claims, wherein the injector connection is designed such that it can be connected to a diesel injector, a gasoline injector, a gas injector and / or a piezo injector.
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    同族专利:
    公开号 | 公开日
    CH711076A2|2016-11-15|
    DE102015005747B4|2017-05-11|
    DE102015005747A1|2016-11-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19821561A1|1998-05-14|1999-11-18|Bosch Gmbh Robert|Solenoid valve drive method and apparatus for motor vehicle fuel measurement in internal combustion engine|
    DE10041448A1|2000-08-23|2002-03-07|Bosch Gmbh Robert|Method and device for controlling an internal combustion engine|
    JP3941853B2|2000-12-04|2007-07-04|愛三工業株式会社|Fuel injection control device|
    DE10300194A1|2002-04-08|2003-10-23|Bosch Gmbh Robert|Method for monitoring an internal combustion engine|
    JP3960260B2|2002-07-09|2007-08-15|株式会社デンソー|Engine control system|
    JP4148128B2|2003-12-12|2008-09-10|株式会社デンソー|Fuel injection device|
    DE102004040926B4|2004-08-24|2019-03-21|Robert Bosch Gmbh|Method for operating an internal combustion engine|
    DE102010042853A1|2010-10-25|2012-04-26|Robert Bosch Gmbh|Method and device for controlling an injector in a fuel injection system of an internal combustion engine|
    DE102013211469A1|2013-06-19|2014-12-24|Robert Bosch Gmbh|Method for operating at least one injection valve|
    法律状态:
    2020-09-30| PFA| Name/firm changed|Owner name: LIEBHERR-ELEKTRONIK GMBH, DE Free format text: FORMER OWNER: LIEBHERR-ELEKTRONIK GMBH, DE |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015005747.2A|DE102015005747B4|2015-05-05|2015-05-05|Injektorzustandsüberwachung|
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