Device for detection timing

 

The invention relates to a device for recognition of the valve timing in an internal combustion engine. The technical result consists in the possibility of creating a device for the recognition of phases, which would allow to perform synchronization without the use of a camshaft position sensor and without the use of additional parts and components. Device for detection timing is intended for an internal combustion engine having a crankshaft, the angular position of which is continuously determined by processing coming from the crank shaft position sensor signals in the control unit, which, depending on the angular position of the shaft generates command pulses to the fuel injection and ignition. For recognition phases after start of the engine control unit acts on the injection and analyzes emerging as a result of this change impacts the frequency of rotation of the motor shaft. Thus for the given cylinder is deactivated injection, resulting in them not fuel injection, and the output signal of the position sensor crankshaft controlsets after the establishment of the fact of starting the engine in that range, in which the rotational speed is reduced, and this range corresponds to the descending branch of the characteristics of the starting emission when the overshoot. 5 C.p. f-crystals, 9 Il.

The present invention relates to a device for recognition of the valve timing in an internal combustion engine (ice) having a crankshaft, the angular position of which is continuously determined by processing coming from the crank shaft position sensor signals in the control unit, which, depending on the angular position of the shaft generates command pulses to the fuel injection and ignition and for which recognition phases after start of the engine acts on the injection and analyzes emerging as a result of this change impacts the frequency of rotation of the motor shaft in one set of cylinders is deactivated injection, resulting in them not fuel injection, and the output signal of the crank shaft position sensor is monitored for emergence expected in response to disabling injection reactions.

In multi-cylinder internal combustion engine having a crankshaft and at least one all shafts calculates when and in what cylinder you should inject the fuel and at what point of time should occur ignition. Thus the angular position of the crankshaft is usually determined by using a sensor that measures the rotation of the crankshaft, respectively, connected to a disk having a characteristic surface.

Since the crankshaft in one working cycle of the internal combustion engine makes two revolutions, one of only a determination of the angle of rotation of this crank shaft is impossible to unambiguously determine the phase timing in internal combustion engines. Therefore, for an unambiguous recognition of the current phases typically use a second sensor that measures the rotation is connected to the camshaft of the master disk, the surface of which has a check mark. Since the camshaft in one working cycle of the internal combustion engine makes just one revolution, the control unit based on a combination of signals from the position sensors crankshaft and the camshaft, can identify a clear connection between them and take the so-called synchronization.

In those systems where there is no camshaft position sensor, respectively, the sensor phase gazoraspredeleniye from the crank shaft position sensor, to ensure synchronization. A system in which the phases are determined without the use of an appropriate sensor camshaft known from DE-OS 4418577. In this known system, the beginning of injection is calculated for each cylinder according to the angular position of the crankshaft, also known as a corner of an advancing of injection, purposefully change so that when switching from one working cycle to the next by a mismatch between the timing was required was a change in the rotation frequency recognized by processing signals from the position sensor crankshaft. This change speed recognized and analyzed in the control unit, is used to determine and subsequent synchronization of timing.

However, this system does not provide reliable and trouble-free determination of timing.

The present invention was based on the task of developing a device for detection timing specified at the beginning of the description of the type, which would allow to perform synchronization without the use of a camshaft position sensor and the be the fact that the injection fuel is switched off after the establishment of the fact of starting the engine in that range, in which the rotational speed is reduced, and this range corresponds to the descending branch of the characteristics of the starting emission when overshoot.

The advantage of the proposed invention the device consists in the possibility of synchronization without the use of a camshaft position sensor and without the use of additional parts and elements, as well as secure and reliable determination of the timing, if non-compliance of the phases required its possible correction, respectively, re-sync. This merit is achieved, in part, due to the fact that using the proposed invention, the device for detection timing-dependent rotation frequency of the output signal of the crank shaft position sensor is monitored to determine whether disabling fuel injection into the specified cylinder to the resulting change in the rotational speed, respectively, to the so-called failure in the curve of the rotational speed or abrupt landing speed. On the basis of the detected change of the rotation frequency, you can determine whether the decision to be taken the final sync.

According to one preferred embodiment of the proposed invention the device on the basis of the output signal of the crank shaft position sensor determines the time intervals of rotate for a certain angle segment, with the specified segment has a predetermined angular extent, and the time of turning on the segment is set so that the crankshaft was turned during this time, one segment, and comparing the selected time intervals of turn segment is recognized by pass plugs used for detection timing.

In this case, it is preferable to define the difference between the predetermined time intervals of turn segment, compare the difference with a specified or agreed minimum value and recognize the badge of ignition in the case, if the difference is greater than the minimum value.

Found skipping ignition is preferable to correlate with counter cylinder with the corresponding phase distribution, and the detected misfire to summarize, in each case using a counter, describing the phase distribution as the corresponding desired or if an incorrect synchronization is changing synchronization with its offset 360the angle of rotation of the crankshaft.

In accordance with another preferred implementation proposed in the invention device on the basis of the output signal of the position sensor crankshaft frequency of rotation is defined, and the definition of frequency in each case is based on the time of turning on the segment.

Below the invention is described in more detail on the example of one of the variants of its implementation with reference to the accompanying drawings on which is shown:

in Fig.1 is a schematic depiction of components of a control system of an internal combustion engine necessary for explanation of the invention, and

in Fig.2-5 - time diagrams of change is significant for the invention of the parameters, respectively, of control signals.

In the form shown in Fig.1 the control system of an internal combustion engine (ice) position 10 marked specifies a disk rigidly connected to the crankshaft 11 of the internal combustion engine and having a perimeter many of the same angular marks 12. In addition to these the same angular marks 12 on the disk there is a check mark 13 formed, for example, by skipping two angular marks. The total number of angular marks is, for example,Locke 15 management which after processing are converted into signals of rectangular shape reproducing the shape of the working surface of the master disk 10.

Available in the usual internal combustion engine, the sensor valve timing, which determines the angular position of shaft 16, respectively connected to the camshaft 16 disk label, which in this case is not provided. Information characterizing the phase distribution of the angular position, which is usually obtained on the basis of the output signal of such a sensor will cause as described below.

On the various inputs of the control unit 15 receives other input signals characterizing necessary to control, respectively, control the internal combustion engine settings. Appropriate sensors are denoted by common position 17. On another entrance control unit receives the signal "ignition on", the switch 18 ignition is supplied with terminals KL 15 lock ignition switch. The control unit 15, which includes at least a Central processor 28 and a memory 19, in the performed calculations generates signals that control the ignition and injection, and outputs these signals to the outputs 20 and 21. System the ez switch 23.

The above-described apparatus shown in Fig.1, allows at any time to determine the angular position of the crankshaft 11 in the process of combustion. Because the relationship between the angular positions of the crankshaft and camshaft known as well as the relationship between the angular position of the camshaft and the position of the pistons of the individual cylinders, after determining the position of the notch can be sync, but only if there is a signal characterizing the phase distribution, also called the phase angle.

Such characterizing the phase angle signal is required insofar as issued by the crank shaft position sensor signal characterizing the position of the reference marks is ambiguous for the reason that the crankshaft in one working cycle of the internal combustion engine makes two revolutions while the camshaft is committing only one turnover.

With the intention that in the system without sensor valve timing, it was possible to determine the phase angle and to produce sequential fuel injection, the control unit performs the following operations.

After establishing that the engine start is carried out, and less the TCI process sequential injection begins with the first notch. As we don't know at what stage of rotation is the crankshaft, the rotation angle of the crankshaft corresponding to the advance injection, either meets or does not meet desired, differing from it in a 360the angle of rotation of the crankshaft. To determine the phases after start of injection internal combustion engine in one of the cylinder block, respectively disable. When the injection stops for about three working cycle of the engine, in the descending branch of the characteristics of the starting emission when the overshoot. Under the descending branch of the characteristics of the starting emission when overshoot podrazumevaetsya decrease speed. If the phase angle is uniquely determined, after a short period of time-out re-injection is turned off at idle.

In the period of injection up to two rotations of the crankshaft after the last outage injection monitors the time of rotation of the crankshaft at a particular angular segments. In this segment, the turn on which control determines so that they, if we consider a pie chart is Ino point, which is determined by the position of the piston of the internal combustion engine corresponding to the ignition timing, and the position of this segment should be set for each engine. The length of the segment is calculated as the ratio of 720the angle of rotation of the crankshaft to the cylinder, and the segment covers a certain amount of angular marks, respectively fronts signals. Because it is determined by the time at which the crankshaft is rotated in one segment, the characteristic by which analyzes the frequency of rotation of the motor shaft, takes the view characteristics of the lowpass filter. When this average value is formed by several angular marks, respectively, on several fronts signals. The position of the segment should be chosen so that the rise time specification of turning on the segment as a result of disabling the ignition in the cylinder, i.e. the rise time characteristics due to the absence of ignition of the fuel, accounted for half of the segment. This ensures the maximum possible signal-to-noise, reduce noise, make the subsequent segment.

To determine the so-called failure in crooked is nil time intervals of turn segment, in which can manifest the effects of disabling injection. For example, in a four cylinder internal combustion engine shut off injection into the 1st cylinder and analyze the time of turning on the segment located around the point, which is determined by the position corresponding to the ignition timing in the 2nd and 4th cylinders. For an engine with an even number of cylinders, this means that the time intervals of rotation each time is determined by the same segment of a mechanical device, i.e., each time between the same angular marks. The result might have the setting dial deviation from the nominal dimensions, defined by the production tolerances have no effect on the analysis of information characterizing the frequency of the rotation.

Defining for the 2nd and 4th cylinders difference between their intervals of rotation for a certain segment when disabled the 1st cylinder, one can calculate the dynamic value, which must exceed a specified absolute value, so that you can register a pass outbreaks in the corresponding cylinder. This value for the four-cylinder internal combustion engine calculated as follows:

dts(k)=ts(k) ts(k-2),

where ts denotes the time of turning on the segment, a dts means Dean is segment can be calculated and the difference between the last two dynamical quantities. As a result, this difference must be an absolute value, calculated as follows:

Ddts=dts(k)-dts(k-2).

The influence of the frequency of rotation can be ignored, because the injection is disabled only in a small interval of changes of speed. To successfully find the phases necessary to determine, for example, the number of missed for one cylinder injection minus one. For example, the successful determination of the phases can be recognized in the case when three passes injection twice will be recognized correctly established abrupt landing speed. In addition, the absence of detectable pass outbreaks in another cylinder can serve as another condition under which the process of determining the valve timing can be successful and be completed. If the result of determination of the timing will be set mismatch synchronization 360the angle of rotation of the crankshaft, the synchronization change with such a mismatch on the back.

In Fig.2 and 3 as an example, in which the phase mismatch distribution 360angle collectiblestoday in a time-dependent parameters: the Opening of an inlet valve", Team pulse injection (ti), "Ignition" (Zdg), "Disable injection", "Change synchronization", "speed", while the numeral to the right of the corresponding parameter (h), means the number of the corresponding cylinder (Zyl_x), Bez_M means a check mark, a Phase means the phase of the timing. In Fig.4 and 5 show the same parameters, but in the example with the correct timing.

Claims

1. Device for detection of valve timing in an internal combustion engine having a crankshaft, the angular position of which is continuously determined by processing coming from the crank shaft position sensor signals in the control unit, which, depending on the angular position of the shaft generates command pulses to the fuel injection and ignition and for which recognition phases after start of the engine acts on the injection and analyzes emerging as a result of this change impacts the frequency of rotation of the motor shaft in one set of cylinders is deactivated injection, resulting in them not fuel injection, and the output vpryskovye reaction, characterized in that the injection fuel is switched off after the establishment of the fact of starting the engine in that range in which the rotational speed is reduced, and this range corresponds to the descending branch of the characteristics of the starting emission when overshoot.

2. The device under item 1, characterized in that on the basis of the output signal of the crank shaft position sensor determines the time intervals of rotate for a certain angle segment, with the specified segment has a predetermined angular extent, and the time of turning on the segment is set so that the crankshaft was turned during this time, one segment, and comparing the selected time intervals of turn segment is recognized by pass plugs used for detection timing.

3. The device according to p. 2, characterized in that it is determined by the difference between the predetermined time intervals of turn segment, the difference is compared with a specified or agreed minimum value and is recognized by pass the ignition if the difference is greater than the minimum value.

4. The device according to p. 3, characterized in that the detected pass ignition and ignition are summed in each case using the counter, characterizing the phase distribution as the corresponding desired or not.

5. Device according to any one of the preceding paragraphs, characterized in that upon detection of incorrect synchronization is changing synchronization with its offset 360 rotation angle of the crankshaft.

6. Device according to any one of the preceding paragraphs, characterized in that on the basis of the output signal of the position sensor crankshaft frequency of rotation is defined, and the definition of frequency in each case is based on the time of turning on the segment.

 

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