DE102015009201A1 - Information distribution system and internal combustion engine with such - Google Patents

Abstract

Information distribution system (1) for an internal combustion engine (3), comprising: - at least one speed sensing device (19, 21) for detecting an engine speed, which speed sensing device (19, 21) is connected in a signaling manner to a higher-level control unit (35) of the information distribution system (1); wherein the control unit (35) has a bus interface (39) via which at least one control unit (41, 43) of an internal combustion engine (3) can be connected to the control unit (35), wherein the control unit (35) is set up, a sensor signal (23 ) of the at least one connected Drehzahlsensiervorrichtung (19, 21) to process and based on an angle and / or speed information signal (45) via the bus interface (39) output.

Description

The present invention is based on an information distribution system according to the preamble of claim 1. Furthermore, the invention relates to an internal combustion engine with such an information distribution system according to claim 7.

In the prior art various central control devices are currently used on internal combustion engines, in particular diesel engines or gas engines, such as ECU (Electronic Control Unit), EMU (Engine Monitoring Unit), EXU (Engine Controller Extension Unit). All these control units are connected to engine speed sensing devices to know the cylinder position (angle information about a combustion cycle 720 ° CA) and to initiate further measures depending on the operating situation, for example an injection mode.

In order to use the same sensors with the various control devices, the sensor signals are usually split, that is, split between multiple controllers. This measure, however, can cause problems among other things in the detection of sensor failures. Furthermore, it is problematic that a respective control unit according to the connected sensor types (and measuring wheels) must be configured, d. H. the implemented software and hardware of the control unit must in particular make it possible to be able to process the signals of the sensor correctly, that is, in particular to be matched to the signal output form of the sensor. This is - z. As part of a parameterization of a particular controller - disadvantageous consuming. Another problem here is the high cabling complexity or the complexity of the wiring harness in such solutions.

Proceeding from this, the object of the present invention is to provide a device and an internal combustion engine with such a device, with which the above disadvantages can be overcome.

This object is achieved with an information distribution system with the features of claim 1 and with an internal combustion engine with the features of claim 7.

Advantageous developments and embodiments of the invention are specified in the further claims.

The invention proposes a bus system or information distribution system for an internal combustion engine or an internal combustion engine, in particular a (large) diesel engine or a gas engine. An internal combustion engine provided with the information distribution system may be provided, for example, for a motor vehicle such as a ship, a locomotive or a commercial vehicle, or even for a stationary device, e.g. As for a combined heat and power plant, an (emergency) generator set or for industrial applications. In the context of the present invention, a diesel engine operated with an internal combustion engine z. B. also be provided for use with heavy oil, or bio-oil, a gas engine, for example, for the operation with gaseous fuel in the form of z. As natural gas, biogas, special gas, landfill gas or z. B. also hydrogen.

The information distribution system comprises at least one Drehzahlsensiervorrichtung for detecting an engine speed (of the internal combustion engine), in particular a camshaft or crankshaft speed, wherein the speed sensing device is connected to a higher-level control unit of the information distribution system signaling. Within the scope of the invention, a higher-level control unit is preferably a central engine control unit, in particular a base control unit or an electronic control unit (ECU), in particular an internal combustion engine, which receives or receives the sensor signals of the speed sensing apparatus.

The Drehzahlsensiervorrichtung has to provide the sensor signal, in particular a speed sensor, z. B. in the form of an induction encoder or an incremental encoder. In the context of sensor signaling, a speed signal can be generated here, for example, and preferably by means of the encoder elements of an encoder wheel of the speed-sensing device, for example, B. with donor elements in the form of teeth and gaps of a gear or the webs and holes of a pinwheel, wherein the encoder wheel sits on the cam or crankshaft. In this case, the sensor elements on the sensor signal generating, for example, by induction-based generation of an AC voltage due to the passing movement of the sensor, d. H. supplying a speed signal as a sensor signal.

Alternatively or additionally, it is provided with the invention that the speed sensing device can supply or supply reference mark or position signals to the higher-level control unit as part of its sensor signaling, for example generated by a tooth or web recessed on the transmitter wheel. By means of the reference mark signals can be easily detected a certain rotational position or a rotational angle of the motor, which or which corresponds to the rotational position of the shaft and - when using a sensor wheel - with the rotational position of the encoder wheel.

Embodiments of the information distribution system in which the at least one speed-sensing device supplies both position and speed signals to the higher-level control unit as part of their sensor signaling are preferred. It should be noted in this context that, of course, other embodiments of a respective speed sensing device are conceivable, which do not make use of a sensor wheel.

In the information distribution system according to the invention, the control unit furthermore has a bus interface or a bus interface via which or which at least one control unit of a motor can be connected to the control unit. In this case, the control unit is set up to process the sensor signal of the at least one connected speed-sensing device and to output thereon an angular and / or rotational speed information signal via the bus interface, preferably a signal which contains both angular and rotational speed information. The output signal is preferably output continuously, d. H. continuously.

By means of the invention, an information distribution system with an angle and / or speed bus can be provided to the internal combustion engine, which is able to distribute angular and / or rotational speed information supplied by the speed sensing device to the control unit via the bus to further control devices of the internal combustion engine. Thus, a cost-effective and secure way is created to be able to supply a variety of central and decentralized control units without problems with angular and / or speed information, d. H. by connection to the control unit via the bus interface.

In this case, the cabling effort is advantageously minimized, besides it is possible to provide all connected control units with a single, in particular single, output via the bus interface angle and / or speed information signal. A vote on different Drehzahlsensiervorrichtungen (eg, in view of the type of sensor used, the design of the encoder wheel (number of teeth, holes), which can be used depending on the configuration of the internal combustion engine or type of application, now only needs to be made for the control unit While tethered control devices can always be supplied with the same signal form via the bus interface, thus also for the same can be initialized prior to use with the invention advantageously eliminates the sources of error from any incorrect parameterization of the connected control units, so again the reliability can be increased can.

In the context of the invention, it is possible, in particular due to the use of the same signal form, to implement much simpler and more efficient software programs on the microprocessors of the connected control units, which also reduces the calculation times in the software of the respective microprocessor. The complex synchronization logic and sensor failure detection of the speed sensors only has to be implemented once. Also, the testing of the software - especially in the control units which are connected via the bus interface - is considerably simplified, insofar as only one signal form is to be processed. This also involves a significant reduction in the memory requirement in the respective microprocessor, whereby smaller and hence more cost-effective microprocessors can now be used in the circuit design by reducing the memory required and by optimizing the calculation processes. On external RAM memory, which require considerable space on the board and thereby uphold the ECU costs, can thus be advantageously dispensed with. The simplified software in all subcomponents or connected ECUs means less software / system complexity and therefore easier maintainability.

The bus interface is preferably bidirectional in the context of the invention, but could alternatively be provided unidirectionally. The bus interface is preferably a digital interface, and furthermore such an interface, via which the angle and / or speed information signals based on the sensor signal of the speed sensing device can be transmitted in real time or without delay (low latency) to subscribers connected to the bus interface.

In the context of the invention, it is provided that in the information distribution system at least one control unit of an internal combustion engine or a plurality of control units of the same internal combustion engine is connected to the control unit via the bus interface. For example, a number of control units in the form of cylinder pressure modules are preferably connected to the control unit via the bus interface (for example, such cylinder pressure modules as disclosed in the Applicant's further application under the reference 2014P00148 DE01 (the Applicant), the disclosure content of which particularly with regard to the cylinder printing modules disclosed therein, hereby incorporated by reference), besides, for example, an EXU (engine controller Extension Unit), which is provided for example for (single) memory pressure detection at a respective injector, for example, for detecting cylinder pressures in the combustion chamber, or further, for example, an EMU (Engine Monitoring Unit).

With the information distribution system, it can furthermore be provided that two or more speed-sensing devices are signal-connected to the control unit. For example, one of the speed sensing devices may cooperate with the camshaft, while the other speed sensing device preferably cooperates with the crankshaft. By contrast, solutions in which, for example, only one camshaft sensor is provided can offer themselves, for example, for a stationarily operated gas engine.

In particular, in embodiments in which a plurality of Drehzahlsensiervorrichtungen is connected to the control unit, it is provided that the control unit is configured here to process the sensor signals of the plurality of connected Drehzahlsensiervorrichtungen and based output an angle and / or speed information signal via the bus interface, in particular a single (in particular continuous) signal. A complex synchronization logic, which in this case has to take into account the plurality of sensor signals, advantageously only needs to be provided in the control unit in such embodiments (but no longer in each control device as in the prior art). Obviously, in the context of the present invention, the sensor failure detection can advantageously be performed simply by the control unit, for example as part of a status monitoring. In that regard, the control unit in the context of the invention preferably also has a related security functionality.

In the information distribution system, the control device can be set up to output an angular and / or rotational speed information signal via the bus interface, which has a pulse signal, in particular in the form of a continuous continuous pulse signal. Furthermore, the control device can be set up to output an angular and / or rotational speed information signal via the bus interface, which has a synchronization signal (which is provided, for example, for synchronization by the connected control devices, in particular for reading out the angle information). Preferably, an angle and speed information signal is output, which is particularly preferably provided as a continuous pulse signal and in addition to speed signal components and angle (position) signals or shares.

The invention also proposes an internal combustion engine with an information distribution system as discussed above. Advantageous embodiments are given in particular by the fact that in the internal combustion engine only the control unit has a synchronization logic for processing the sensor signal of the at least one connected Drehzahlsensiervorrichtung and / or output of the angular and / or rotational speed information signal, further to the fact that in the internal combustion engine, only the control unit, a sensor failure detection function has, d. H. with respect to the at least one speed sensing device.

In order to avoid unnecessary redundancies in particular, it is proposed that in the internal combustion engine only the control unit receives sensor signals from the at least one, in particular all (engine speed) Drehzahlsensiervorrichtungen, which control unit based on the processed speed information, the angle and / or speed information signal to at least one over outputs the bus interface connected control unit.

The connected via the bus interface controllers in turn are all in particular equipped with a signal processing capability, which allows the processing of the angular and / or speed information received via the bus interface from the angular and / or rotational speed information signal, in particular advantageously uniformly or with the same hard and / or software, so that their parameterization can be standardized.

Further features and advantages of the invention will become apparent from the following description of embodiments of the invention, with reference to the figures of the drawings, which show details essential to the invention, and from the claims. The individual features may be implemented individually for themselves or for a plurality of different combinations in a variant of the invention.

Preferred embodiments of the invention are explained below with reference to the accompanying drawings. Show it:

1 exemplary and schematically an information distribution system in conjunction with an internal combustion engine according to a possible embodiment of the present invention.

2 exemplary and schematically possible signal forms with an information distribution system according to the invention.

In the following description and the drawings, the same reference numerals correspond to elements of the same or comparable function.

1 shows an example and schematically an information distribution system 1 for an internal combustion engine 3 , wherein the information distribution system 1 on an internal combustion engine 3 is shown provided. The internal combustion engine 3 , preferably a (large) diesel engine or gas engine, has a number of cylinders 5 on, z. Example, between 6 to 20 or even more than 20 cylinders 5 , which each have a (stroke) piston guided therein 7 exhibit. At a combustion chamber 9 a respective cylinder 5 is an injector 11 arranged, continue z. B. a cylinder pressure sensor 13 ,

The internal combustion engine 3 further comprises a camshaft 15 and a crankshaft 17 whose speed, as far as the engine speed, depending on a Drehzahlsensiervorrichtung 19 . 21 of the information distribution system 1 is detected, ie a first 19 and a second 21 Drehzahlsensiervorrichtung. Alternatively, for example, it may be provided that only the camshaft 15 or just the crankshaft 17 with a Drehzahlsensiervorrichtung 19 respectively. 21 cooperates, z. B. also or just in case of failure, if it comes to a sensor failure on the other shaft.

For speed measurement of the respective shaft 15 respectively. 17 and for providing a corresponding sensor signal 23 (S. 2 ) includes the respective Drehzahlsensiervorrichtung 19 . 21 a donor wheel 25 respectively. 27 , which rotatably with the shaft 15 respectively. 17 is connected and which with a speed sensor 29 respectively. 31 the speed sensing device 19 respectively. 21 - obeying an inductive measuring principle - cooperates. The respective donor wheel 25 . 27 has a number of donor elements (teeth and gaps or lands and holes) (not shown) and induces upon rotation of the shaft 15 respectively. 17 an alternating voltage at the speed sensor 29 respectively. 31 , whose period with the rotational speed of the shaft 15 respectively. 17 varies and based on which extent the sensor signal 23 is output (in this case, therefore, the signal frequency is a measure of the on the shaft 15 respectively. 17 recorded speed).

The respective speed sensing device 19 . 21 delivers with the sensor signal 23 continue to provide information 33 , which the rotational position or angular position of the encoder wheel 25 respectively. 27 signaled. This reference mark 33 is by means of a recessed donor element on the encoder wheel 25 respectively. 27 generated, whose position is tuned to a predetermined crankshaft or cylinder position, for example, and preferably to the top dead center (TDC) of the first cylinder 5 , At the point of the reference mark 33 clears the sensor signal 23 in each case, whereby a detection of the angular position is possible. Such a sensor signal 23 how this can be provided as a continuous signal is shown by way of example 2 , z. B. as by the sensing device 19 respectively. 21 preprocessed pulse signal.

The particular, provided for detecting the engine speed Drehzahlsensiervorrichtung 19 . 21 is signaling, that is the sensor signal 23 Delivering, to a higher-level control unit 35 of the information distribution system 1 Tied, with the parent control unit 35 is formed by a base control unit or a central engine control unit, in particular an ECU. The superior control unit 35 In this case also detects the status of the respective Drehzahlsensiervorrichtung 19 . 21 , for example in the context of a monitor ring of the speed signal / the speed signals for the purpose of error detection (sensor failure detection). To the control unit 35 are - in addition to a number of other vital system components of the internal combustion engine 3 (not shown) - for example, the injectors 11 the internal combustion engine 3 via one control line each 37 connected, that is for their injection control.

As in particular 1 illustrates, the control unit 35 also a bus interface 39 on, via which at least one control unit 41 . 43 of the internal combustion engine 3 to the control unit 35 attachable and furthermore also tethered, whereby the control unit 35 is set up, sensor signals 23 the at least one connected speed sensing device 19 . 21 , in this case the first 19 and second 21 Speed sensor to process, and based thereon an angular and / or rotational speed information signal 45 via the bus interface 39 output, in particular in the form of a single signal 45 , in this case an angular and rotational speed information signal 45 ,

At the here by means of the bus interface 39 formed angle and speed bus 51 is, for example, a first controller 41 connected in the form of an EMU (Engine Monitoring Unit), by means of which engine operation dependent sensors 47 or actors 49 monitored and / or controlled, which require an angle and / or speed information.

Furthermore, via the angle and speed bus 51 a number of decentralized, cylinder-specific control units 43 to the control unit 35 connected, ie via the bus interface 39 , Which are each provided as a cylinder pressure module (in this case, the cylinder pressure sensor acts with a respective cylinder pressure module 13 the corresponding cylinder 5 sensing a combustion chamber pressure level together). By means of the angle and speed bus 51 in particular real time to the cylinder pressure modules 43 transmitted angle and Speed information, these are enabled, time and angle dependent to detect and analyze a combustion chamber pressure.

2 now shows exemplary waveforms of the information distribution system 1 ie a sensor signal 23 the speed sensing device 21 (Crankshaft) and one based on the control unit 35 via the bus interface 39 output angle and speed information signal 45 ,

The sensor signal 23 is from the Drehzahlsensiervorrichtung 21 - Based on the generated frequency-dependent AC voltage from the speed measurement - provided as a preprocessed digital signal and the control unit 35 supplied (alternatively, for example by the control unit 35 from an analogue alternating voltage signal of the sensor 31 edited). Two full revolutions of the encoder wheel 27 , ie corresponding to a motor work cycle between 0 ° CA and 720 ° CA, in this case correspond to z. B. 240 pulses (at a transmitter wheel 27 with 120 teeth), with a missing pulse depending on the rotational position of the encoder wheel 27 marked according to its position to a predetermined crankshaft or cylinder position, ie the reference or position mark 33 in the sensor signal 23 forms. In the illustrated waveform of the sensor signal 23 corresponds to a sensor signal period z. B. 3 ° KW.

The control unit 35 processes the sensor signal 23 digital further, in particular by means of a suitable signal processor device which z. B. a timer 53 includes. As part of the processing, the sensor signal 23 temporally finer resolved, with a motor work game now z. B. 3600 pulses can be assigned, that is, the resolution corresponding to a period of the bus signal 45 ie the angle and speed information signal provided via the bus interface 45 , is now z. B. 0.2 ° KW. As part of the signal processing by the control unit 35 will continue to be an angle signal 55 as a signal component of the angle and speed information signal 45 which marks according to its position to a predetermined crankshaft or cylinder position (usually OT A1). The angle signal 55 can z. B. a higher - recognizable by a signal processing logic - voltage level than the other pulses 57 have, alternatively z. B. also by a signal gap analogous to the sensor signal 23 be shaped, or be issued differently.

From the angle and speed information signal 45 can the over the bus interface 39 connected control units 41 . 43 by means of their existing signal processing logic (not shown) read now the required, engine operation dependent angle and speed information. For example, for angle determination, a counter with detection of an angle signal 55 in the angle and speed information signal 45 be set in motion, which the pulses 57 counts and the counter reading - continuously - correlated with a rotation angle. In that regard, the angle signal is used 55 here also as a synchronization signal.

For speed determination based on the angle and speed signal 45 can the pulses 57 of the signal on the connected control unit 41 respectively. 43 are counted over a duration and correlated with a time duration of the count.

It should be noted that the signal curves shown 23 . 45 to 2 just show a possible form of signal provision. Of course, different signal forms can also be used in the context of the information distribution system 1 or an internal combustion engine having this 3 be provided so that the embodiment shown by no means a limitation to an embodiment should be expressed.

It should also be noted that it is provided in the context of the invention, in case of failure (detection by monitoring the sensor signals) of the speed sensors 29 respectively. 31 the angle bus 51 automatically switch to the respective other functional sensor, ie by the signal processing control unit or ECU 35 , The failure detection and synchronization of the bus participants (control units) can be implemented in the software, but advantageously to a very limited extent.

Finally, it should be noted that it is provided with the invention and advantageously possible, via the bus interface 39 - via appropriate signal processing in the control unit 35 - independent of the encoder wheels used with the sensing devices 25 respectively. 27 always an angular and / or speed signal 45 output with the same resolution or number of pulses per cycle (for example, with 0.2 ° CA or 3600 pulses), wherein advantageously different settings of the resolution or number of pulses by appropriate configuration of the control unit 35 possible are.

LIST OF REFERENCE NUMBERS

1

information distribution

3

internal combustion engine

5

cylinder

7

piston

9

combustion chamber

11

injector

13

Cylinder pressure sensor

15

camshaft

17

crankshaft

19

first speed sensing device

21

second speed sensing device

23

sensor signal

25, 27

sensor wheel

29, 31

sensor

33

reference mark

35

control unit

37

control line

39

bus interface

41

Control unit (EMU)

43

control unit

45

Angular and / or speed information signal

47

sensor

49

actuator

51

Angular and / or speed bus

53

timer

55

angle signal

57

Pulse

Claims (9)

Information distribution system ( 1 ) for an internal combustion engine ( 3 ), comprising: - at least one speed sensing device ( 19 . 21 ) for detecting an engine speed, which speed sensing device ( 19 . 21 ) to a higher-level control unit ( 35 ) of the information distribution system ( 1 ) is connected signaling; characterized in that - the control unit ( 35 ) a bus interface ( 39 ), via which at least one control device ( 41 . 43 ) of an internal combustion engine ( 3 ) to the control unit ( 35 ), the control unit ( 35 ), a sensor signal ( 23 ) of the at least one connected speed sensing device ( 19 . 21 ) and based thereon an angular and / or rotational speed information signal ( 45 ) via the bus interface ( 39 ). Information distribution system ( 1 ) according to claim 1, characterized in that - at least one control device ( 41 . 43 ) of an internal combustion engine ( 3 ) or a plurality of control devices ( 41 . 43 ) of an internal combustion engine ( 3 ) via the bus interface ( 39 ) to the control unit ( 35 ) is connected; and / or - two or more speed sensing devices ( 19 . 21 ) signaling to the control unit ( 35 ) are connected; and / or - the control unit ( 35 ), sensor signals ( 23 ) of a plurality of connected speed sensing devices ( 19 . 21 ) and based thereon an angular and / or rotational speed information signal ( 45 ) via the bus interface ( 39 ). Information distribution system ( 1 ) according to one of the preceding claims, characterized in that - the control device ( 35 ), an angular and / or rotational speed information signal ( 45 ) via the bus interface ( 39 ) which outputs a pulse signal ( 57 ) having; and / or - the control device ( 35 ) is arranged to output an angle and / or pulse information signal via the bus interface, which is a synchronization signal ( 55 ) having. Information distribution system ( 1 ) according to one of the preceding claims, characterized in that - the bus interface ( 39 ) is a digital interface. Information distribution system ( 1 ) according to one of claims 2 to 4, characterized in that - the control device ( 35 ) is an engine control unit; and / or - the at least one speed sensing device ( 19 . 21 ) with a camshaft ( 15 ) or a crankshaft ( 17 ) cooperates; At least one via the bus interface ( 39 ) connected control unit ( 43 ) is a cylinder pressure module. Information distribution system ( 1 ) according to one of the preceding claims, characterized in that - the angular and / or rotational speed information signal ( 45 ) in real time through the bus interface ( 39 ) on the at least one sensor signal ( 23 ). Internal combustion engine ( 3 ) according to one of the preceding claims, characterized in that - the internal combustion engine ( 3 ) an information distribution system ( 1 ) according to one of the preceding claims. Internal combustion engine according to claim 7, characterized in that - in the internal combustion engine ( 3 ) only the control unit ( 35 ) a synchronization logic for processing the sensor signal ( 23 ) the at least one connected Drehzahlsensiervorrichtung ( 19 . 21 ) and / or for outputting the angular and / or rotational speed information signal ( 45 ) having; and / or - in the internal combustion engine ( 3 ) only the control unit ( 35 ) a sensor failure detection function with respect to the at least one Drehzahlsensiervorrichtung ( 19 . 21 ) having. Internal combustion engine ( 3 ) according to claim 7 or 8, characterized in that - in the internal combustion engine ( 3 ) only the control unit ( 35 ) a sensor signal ( 23 ) on the part of the at least one speed sensing device ( 19 . 21 ) with the control unit ( 35 ) based on the processed sensor signal ( 23 ) the angular and / or rotational speed information signal ( 45 ) to at least one via the bus interface ( 39 ) outputs connected control unit.

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