Variable ignition dwell angle ahead of tdc

FIELD: engines and pumps.

SUBSTANCE: invention relates to ICE two-stroke engine rpm control means and processes. Particularly, it covers ignition dwell angle control relative to TDC. At preset engine rpm, ignition dwell angle can be adjusted step-by-step. Alternation between two ignition dwell angles can be performed in one or several steps. In case engine rpm exceeds the threshold magnitude, dwell angle can be adjusted.

EFFECT: efficient control over dwell angle, engine higher reliability and longer life.

17 cl, 3 dwg

 

The technical FIELD TO WHICH the INVENTION RELATES.

The present invention relates to a vehicle control two-stroke internal combustion engine. In particular, it relates to a method and device for speed control of two-stroke internal combustion engine.

BACKGROUND of INVENTION

Two-stroke internal combustion engines are widely used in various portable instruments, including, but not limited to, chain saws, brush cutters, lawn mowers, blowers and mowers. When during operation of the two-stroke internal combustion engine works with a very small load, the engine speed can reach very high values. This leads to premature wear and engine failure. Thus, there is a need to regulate the number of revolutions of the engine to avoid engine damage.

As a rule, to control the number of revolutions of the engine to regulate the ignition timing of the engine relative to the position of the top dead center (TDC). As is well known in the prior art, if the number of revolutions of the engine reaches a predetermined threshold engine speed, the engine speed adjust gradually and continuously delaying the ignition timing relative to TDC position. The angle is puregene of ignition relative to TDC refers to the angular position of crankshaft degrees before TDC, when the spark ignites the air-fuel mixture in the cylinder during the compression stroke. However, the reduction of the advance angle of ignition in the immediate vicinity of the TDC can be hit unburned fuel in the exhaust. This leads to loss of power, increased concentrations of pollutants in the exhaust gases and increase unwanted noise. In addition, the exhaust gas temperature is very high, and this can also lead to unintended surface ignition.

In addition, the ignition timing also depends on the temperature of the engine and when the engine is cold reduction of the advance angle of ignition in the immediate vicinity of TDC leads to incomplete combustion and an increase of pollutants in the exhaust gases.

In some cases, along with the control of ignition timing to control engine speed using the pass outbreaks. When skipping outbreaks are missing ignition under certain revolutions of the crankshaft. It helps to regulate the number of revolutions of the engine, and reduces the temperature of the exhaust gases. However, this has the disadvantage that it is blowing unburned gas during the engine speed, in which there is a pass ignition, as well as increasing the number of pollutants in lobnig gases. In addition, skipping flares also affect the performance because of the uneven power output of the engine.

In light of the above, there is a need for improved system and method for controlling speed in a two-stroke internal combustion engine. In addition, there is a need for a means of controlling the number of revolutions of the engine to provide improved performance and efficiency of the engine.

The INVENTION

In connection with the foregoing, the task of solving, or at least reduce the above problems. In particular, the aim is to provide ways and means of regulating the number of turns in the two-stroke internal combustion engine to avoid engine damage.

The goal is achieved by using innovative device according to claim 1, characterized in that the device includes means to change the ignition timing in the two-stroke internal combustion engine. The tool changes the ignition timing allows adjustment of the ignition timing in sequential mode, depending on the number of revolutions of the engine. Thus, the device is able to control the number of revolutions of the engine at low load. The tool used to change the ignition timing is not in continuous operation for high is x number of engine revolutions and control of any additional increase in the number of revolutions of the engine. In addition, according to the variant embodiment of the invention, the tool changes the ignition timing if the engine speed above the threshold speed of the engine.

According to another variant embodiment of the invention, the tool changes the ignition timing provides control of the ignition timing so that the ignition timing Paladino regulate within one or more range variables. However, according to item 4, the ignition timing such that the ignition timing Paladino regulate alternating between the first ignition timing and the second ignition timing. According to a particular variant embodiment of the invention, when the engine is cold the tool changes the ignition timing can change the ignition advance angle of approximately 31 degrees before top dead center position (TDC) and up to approximately 10 degrees before TDC. In addition, when the engine is warm, the tool changes the ignition timing angle from about 10 degrees before TDC and to approximately 0 degrees before TDC.

According to another variant implementation, the motor is operated at a speed in the range from 0 rpm to 15,000 rpm, and the threshold speed DV is the engine set to 8000 rpm Thus, the ignition timing Paladino regulate to control the number of revolutions of the engine beyond 8000 rpm According to claim 9 and 10, in addition to the change of the ignition timing during one or more revolutions of the crankshaft may be skipping the ignition and/or the engine can operate with the same ignition timing for two or more revolutions of the crankshaft.

According to the second object of the invention, a method for engine control. The method may include defining the number of revolutions of the engine and changes the ignition timing in relation to the position of the top dead center point depending on the number of revolutions of the engine. Then, when exceeding the engine speed threshold engine speed, the ignition timing adjust in sequential mode.

According to a variant implementation of the second object of the invention, the method may include changing the ignition timing between one or more variables ranges. In addition, according to other variants of the implementation of the second object of the invention, the method may include changing the ignition timing between the first ignition timing and the second ignition timing, for example, from 31 degrees to 10 degrees for cold engines is the appropriate fields from 10 degrees to 0 degrees for warmed-up engine.

According to 17, in other embodiments implement the second object of the invention, the method further includes motor control in the range from 0 rpm to 15,000 rpm and skipping ignition during one or more revolutions and/or the operation of the engine at the same angle of ignition timing for two or more turns.

BRIEF DESCRIPTION of DRAWINGS

Hereinafter the invention will be described in more detail with reference to the accompanying drawings, on which:

figure 1 is a block diagram illustrating a control unit for regulating the number of revolutions of the engine in a two-stroke internal combustion engine according to a variant implementation of the present invention;

figure 2 shows a sample graph of the relationship between ignition timing and engine speed according to a variant implementation of the present invention;

figure 3 shows an exemplary method for controlling engine speed according to a variant implementation of the present invention.

DESCRIPTION of embodiments

The present invention will be described in more detail hereinafter with reference to the accompanying drawings showing preferred embodiments of the invention. This invention, however, can be made in different forms, but these options ASU is estline described thus, to this description was thorough and complete and fully disclose the scope of the invention to specialists in this field of technology. In the drawings, identical numerals refer to identical links.

Figure 1 is a block diagram illustrating the unit 100 controls to regulate the number of revolutions of the engine in a two-stroke internal combustion engine (not shown) according to a variant implementation of the present invention. Two-stroke internal combustion engine (hereinafter referred to as "engine") can be used in portable power tools such as chain saws, trimmers, blowers, lawn mowers and other horticultural or forestry equipment. However, the engine can also be used in any other application within the entity of the present invention.

In the embodiment of the present invention, the unit 100 can control to provide an electronic ignition system associated with the engine control module (ECM). The engine control module (ECM) may also include a control unit fuel injection, the control unit valve timing, the control unit idle speed and other control units for controlling various parameters of the engine. In addition, the ECM may use a different sensor is s devices for example, but not limited to, sensor throttle position sensor crankshaft and temperature sensors. In the embodiment of the present invention, the block 100 control regulates the engine speed by delaying the ignition timing in relation to the position of the top dead center (TDC) in an unstable ratio of the number of revolutions of the engine. The ignition timing relative to TDC refers to the angular position of crankshaft degrees before TDC at which the spark ignites the air-fuel mixture. In another embodiment of the present invention, the unit 100 can control to adjust the engine speed by changing the ignition timing relative to TDC position.

As shown in figure 1, the unit 100 includes a sensor 102 speed, the processing unit 104 and the storage device 106. During operation, the sensor 102 speed measures the speed of the engine. Certain sensor 102 the number of revolutions number of revolutions of the engine can flow to the processing unit 104. The processing unit 104 may compare the engine speed threshold engine speed. Data on the threshold engine speed may be stored in a storage device 106. If the ignition timing exceeds p is horn the number of revolutions of the engine, the ignition timing of the engine can Paladino to vary within a given number of revolutions of the engine. In addition, the unit 100 can be connected to the spark plug 108 ignition to ignite the fuel-air mixture during the compression stroke.

In the embodiment of the present invention, the unit 100 can control to control the ignition timing in one or more variables ranges. In the variable range of the ignition timing can be adjusted Paladino between the first ignition timing and the second ignition timing. In this unstable sequential mode by delaying the ignition timing angle is achieved the best control of engine speed. In another embodiment of the present invention, in addition to changing the ignition timing, can be carried out skipping ignition within a few revolutions of the crankshaft to control the number of revolutions of the engine. In yet another embodiment of the present invention, the engine can operate with the first ignition timing within a few turns, and with the second ignition timing for other revolutions of the crankshaft.

In the embodiment of the present invention, the storage device 106 can be a online application : nausea device (RAM), permanent memory (ROM), flash memory or any suitable storage equipment data. The storage device 106 may include various modules for storage of work teams and other software unit 100 controls. Teams can be represented as a set of executable computer commands to control all operations of the unit 100 controls.

The storage device 106 may store a database of parameters necessary for determining the ignition timing relative to TDC position for a given number of revolutions of the engine. The parameters may include a timing circuit of the ignition timing with engine speed and operating conditions of the engine operating load and other operating Conditions may include output power and load conditions of the engine. In the embodiment of the present invention, the storage device 106 may store data reflecting the stepwise correlation between the ignition timing before TDC and the engine speed. The corners of the ignition timing can also be calculated either in real time or offline. One or more parameters from the storage device 106 may be filed in the processing unit 104.

The processing unit 104 is carried out is t all calculations, necessary to adjust the number of revolutions of the engine. The processing unit 104 may include an interface 110 input/output (I/O). The interface 110 of the I/o may be adapted to receive parameters and executable by the computer commands stored in the storage device 106. In the embodiment of the present invention, the processing unit 104 can receive data on the number of revolutions of the engine from sensor 102 speed through the interface 110 input/output.

The processing unit 104 may also include a computing module 112 to calculate the parameters relating to the determination of the ignition timing. In the embodiment of the present invention, the parameters may reflect the operating conditions of the engine. In an alternative embodiment of the present invention, the processing module 112 can optionally specify additional parameters, including, but not limited to, engine temperature and the number of revolutions during which the ignition will be skipped.

In the processing unit 104 may be enabled module 114 of the ignition timing. On the basis of the parameters calculated in the computing module 112, the module 114 of the ignition timing determines the ignition timing relative to TDC position. In the embodiment of the present invention, the angle of the operas is the position of the ignition timing determined on the basis of the number of revolutions of the engine. In another embodiment of the present invention, the module 114 of the ignition timing can also use additional parameters, including, but not limited to, engine temperature, engine speed, during which the ignition will be omitted, and the backstory of the engine to determine the ignition timing relative to TDC position.

The processing unit 104 may send an output signal to the ignition plug 108 ignition to install a certain ignition timing. In the embodiment of the present invention, the signal may indicate a variable range stepwise adjustment of the ignition timing and adjust the number of revolutions of the engine. In another embodiment of the present invention, the processing unit 104 can issue an output signal when the engine speed is above the threshold engine speed. In various other embodiments, implementation of the present invention, the signal may indicate the number of revolutions during which the ignition must be ignored and/or may include one or more variable range of the ignition timing.

Figure 2 shows an exemplary diagram 200 of the relationship between ignition timing and engine speed according to a variant implementation of this is about invention. As can be seen from the diagram 200, the number of revolutions of the engine can be in the range from 0 rpm to 12,000 rpm, and the threshold engine speed may be about 8000 rpm As shown by the solid line in the diagram 200, when the engine is cold, the unit 100 can control to change the ignition advance angle of approximately 25 degrees before TDC and 12.5 degrees before TDC. As shown in figure 2, when the engine speed is approximately 9000 rpm, the ignition timing Paladino delay from 25 degrees to 12.5 degrees before TDC. In addition, when the engine is warm, the unit 100 can control to change the ignition timing from approximately 12.5 degrees before TDC and to 0 degrees before TDC.

According to another variant embodiment of the invention, the unit 100 can control to change the ignition advance angle of approximately 31 degrees before TDC and up to 10 degrees before TDC when the engine is cold, while when the engine is warm it can change the ignition timing of 10 degrees before TDC and 0 degrees before TDC.

The number of stages, during which produce a delay of the ignition timing can also be more than two, so that the diagram ignition timing angle - rotational speed could have more speed.

The maximum number of revolutions of the engine may vary. For other possible embodiments of the invention, the maximum number of revolutions of the engine may, for example, be 15 000 R/min

The threshold engine speed and the engine speed, during which delay the ignition timing can vary depending on the characteristics of the engine.

In the embodiment of the present invention, the ignition timing of the engine may vary between one or more variables ranges. In addition, during some of the turns of the ignition timing of the engine may be the first ignition timing in the AC range, and for other rpm - second ignition timing in the AC range. So, for example, but not limited to, when the heat engine, the ignition timing may be about 12.5 degrees for every two or three engine rpm and 0 degrees for other turns.

One could, of course, to have more than two variables ranges, so that the diagram ignition timing angle - rotational speed"shown in figure 2, could have more speed.

When using two range variables, that is, when the diagram has the form shown in figure 2, the corresponding values for the discrepancies between the data used corners ignition can be in the following clock interval.

The first ignition timing in the first variable range may be preferably selected from a range from 20 to 40 degrees before TDC.

The second ignition timing for the second variable range (for higher numbers of revolutions of the engine) can be preferably selected from a range from 5 degrees after TDC position to 25 degrees before TDC.

The second ignition timing in the first variable range, which is equal to the first angle of the ignition timing in the second variable range can be selected from the result of the interval between the first ignition timing in the first interval and the second ignition timing for the second interval.

In various other embodiments, implementation of the present invention, to control the ignition timing of the engine in the engine can be used a mechanical ignition system. In the mechanical ignition system for supplying high voltage to the ignition plug 108 ignition can be used distributor. Distributor mechanical ignition system can be adjusted by changing the ignition timing in sequential mode. In the embodiment of the present invention, the distributor can be used with weights and springs, RA is displaced inside the distributor to control the ignition timing depending on the engine speed. In yet another embodiment of the present invention, in addition to mechanical distributor to control the ignition timing can be used, the pressure in the engine manifold and the temperature sensors.

The present invention is described here with reference to the particular implementation. Although embodiments of the present invention have been described with reference to specific hardware and software components, specialists in the art will understand that there may be used various combinations of hardware and/or software components and that some of the operations described as implemented in hardware, can also be implemented in software or Vice versa. Specialists in the art will understand other options implementation.

Figure 3 illustrates a method 300, which summarizes the various stages involved in an exemplary embodiment of the present invention. The storage device 106 unit 100 controls can contain commands of a computer program or software to perform the steps of method 300. Commands of the computer program may include machine-readable commands for receiving and storing data on the number of revolutions of the engine and on the determination of the angle of the OPE is egenia ignition in accordance with the obtained number of revolutions of the engine.

At stage 302, the engine speed can be obtained using the sensor 102 speed. In the sensor 102 number of turns to obtain the number of revolutions of the engine can be used in optical or of the contact type sensor. At stage 304, the ignition timing of the engine is changed in a stepwise mode relative to the TDC position. Received at stage 302, the number of revolutions of the engine can be used to determine the variable range of the ignition timing relative to TDC position.

In the embodiment of the present invention, the method 300 may provide for the adjustment of the number of revolutions of the engine by changing the ignition timing relative to TDC position in the sequential mode, when the number of revolutions of the engine exceeds a threshold engine speed. In the embodiment of the present invention, the threshold engine speed may be set to 8000 Rev/min Within a variable range, the ignition timing may vary between the first ignition timing and the second ignition timing.

On the drawings and in the specifications are disclosed preferred embodiments of, and examples of the invention and, although applied in concrete terms, they are used only in a General and descriptive sense and not for rancitelli purposes, the volume of the inventions set forth in the following claims.

1. The device control two-stroke internal combustion engine, containing the tool changes the ignition timing in relation to the position of the top dead center point of the two-stroke internal combustion engine, in which the tool changes the ignition timing provides control of the ignition timing so that the ignition timing Paladino adjust depending on the number of revolutions of the engine, wherein the ignition timing Paladino delay in two or more stages when exceeding the number of revolutions of the engine threshold speed of the engine.

2. The device according to claim 1, in which the ignition timing Paladino regulate one or more variables ranges.

3. The device according to claim 1, in which the ignition timing Paladino regulate between the first ignition timing and the second ignition timing.

4. The device according to claim 1, in which the ignition timing Paladino adjust from approximately 31 degrees before the upper dead point and up to approximately 10 degrees before top dead center position of the point.

5. The device according to claim 1, in which the ignition timing Paladino govern from the arr is siteline 10 degrees before top dead center position to approximately 0 degrees before top dead center position of the point.

6. Device according to any one of items 1 to 5, in which the threshold engine speed is 6000-14500 rpm

7. Device according to any one of items 1 to 5, in which the engine speed is 0 rpm to 15000 rpm

8. The device according to claim 1, in which during one or more revolutions of the crankshaft are missing the ignition.

9. The device according to claim 1, in which the engine can operate with the same ignition timing for more than one revolution of the crankshaft.

10. The way to control two-stroke internal combustion engine, the method includes determining the number of revolutions of the engine, and changing the ignition timing of the engine relative to the position of the upper dead point in which the change of the ignition timing includes stepwise adjustment of the ignition timing depending on the number of revolutions of the engine, the change of the ignition timing provides a comparison of the engine speed threshold engine speed and the delay of the ignition timing in two or more stages when exceeding the number of revolutions of the engine threshold speed of the engine.

11. The method according to claim 10, in which the change of the ignition timing includes stepwise adjustment of the ignition timing between one or more variable and ranges.

12. The method according to claim 10, in which the change of the ignition timing includes stepwise adjustment of the ignition timing angle between the first ignition timing and the second ignition timing.

13. The method according to claim 10, in which the change of the ignition timing includes stepwise adjustment of the ignition advance angle of approximately 31 degrees before the upper dead point and up to approximately 10 degrees before top dead center position of the point.

14. The method according to claim 10, in which the change of the ignition timing includes stepwise adjustment of the ignition advance angle from about 10 degrees before the top dead center position to 0 degrees before top dead center position of the point.

15. The method according to claim 10, further containing a running two-stroke internal combustion engine from 0 rpm to 15000 rpm

16. The method according to claim 10, further containing skipping ignition during one or more revolutions of the crankshaft.

17. The method according to claim 10, further containing a control operation of the engine with the same ignition timing for more than one revolution of the crankshaft.



 

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FIELD: engines and pumps.

SUBSTANCE: invention relates to ICE two-stroke engine rpm control means and processes. Particularly, it covers ignition dwell angle control relative to TDC. At preset engine rpm, ignition dwell angle can be adjusted step-by-step. Alternation between two ignition dwell angles can be performed in one or several steps. In case engine rpm exceeds the threshold magnitude, dwell angle can be adjusted.

EFFECT: efficient control over dwell angle, engine higher reliability and longer life.

17 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: start locking circuit is designed for an operating tool with an internal combustion engine (20). The internal combustion engine (20) contains a cylinder (21) with a combustion chamber (25) and a control unit (60) to provide the engine operation. When the engine is running the combustion chamber (25) is supplied with combustion air and fuel, wherein the air-fuel mixture in the combustion chamber (25) is ignited with an ignition plug (26). A mode selection switch is designed for actuating the internal combustion engine (20) and has an operating position and a starting position for air-fuel enrichment. The braking unit (19) for locking is coupled with the tool operating body. When in the operating mode, the braking unit (19) for locking locks the operating body with a brake, and when in a standby condition, it unlocks the operating body without actuating the braking system. An operation transmitter is connected with the braking unit (19) for locking to detect the operating mode of the locking braking unit. There is a position sensor in the mode selection switch. The status signal for the operation transmitter (19) of the locking braking unit and the status signal for the position sensor of the mode selection switch are interconnected in such a way that the control unit (60) stops the engine operation in all cases when the mode selection switch is in the starting position, and the locking braking unit (19) is in its standby condition with the braking system off.

EFFECT: avoidance of the engine start with rich mixture without switching the locking braking unit on, as the locking braking unit locks and brakes the tool operating body.

12 cl, 5 dwg

FIELD: engine devices and pumps.

SUBSTANCE: in one of the examples, the method of engine operation is disclosed comprising adjusting an actuator for the first time to automatically stop the engine; adjustment of the actuating mechanism for the second time before the engine reaches the zero rpm speed in response to the request to restart the engine; and adjusting throttle position of air intake at the time after closing the open intake valve of a cylinder having an open intake valve simultaneously with the request to restart the engine, and before closing the intake valve of the cylinder following in the combustion order in the engine in response to the request to restart the engine.

EFFECT: acceleration of engine starting after shutting down, reduction of fuel and emissions.

20 cl, 5 dwg

FIELD: engine devices and pumps.

SUBSTANCE: in one of the examples, the method of engine operation is disclosed comprising adjusting an actuator for the first time to automatically stop the engine; adjustment of the actuating mechanism for the second time before the engine reaches the zero rpm speed in response to the request to restart the engine; and adjusting throttle position of air intake at the time after closing the open intake valve of a cylinder having an open intake valve simultaneously with the request to restart the engine, and before closing the intake valve of the cylinder following in the combustion order in the engine in response to the request to restart the engine.

EFFECT: acceleration of engine starting after shutting down, reduction of fuel and emissions.

20 cl, 5 dwg

FIELD: methods of correction of angular error of absolute angular position sensor recording angular position of first shaft whose rotary motion is interrelated with rotation of second shaft.

SUBSTANCE: proposed method may be used for determination of angular position of internal combustion engine camshaft. Angular position sensor is just absolute angular position sensor. First angular position of second shaft is recorded during complete revolution of first shaft and angular position of first shaft is determined on basis of measurement. Then, respective output magnitude of absolute angular position sensor is compared with respective angular position of first shaft at retained misalignment obtained in the course of comparison. Then, each output magnitude of absolute angular position sensor is corrected for respective retained magnitude.

EFFECT: possibility of compensating angular error of absolute angular position sensor.

4 cl, 4 dwg

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention is aimed at increasing efficiency of discrimination of signals caused by knocking in internal combustion engine from signals caused by other noises in engine. Method is implemented by means of at least one detonation combustion sensor and signal processing unit installed after detonation combustion sensor and provided with at least one comparator. Output signal from detonation combustion sensor is compared after processing by comparator with variable reference value of level formed basing on preceding output signals of said combustion detonation sensor. Reference value of level passes into comparator through low-pass filter, and comparator indicates presence or absence of knocking basing on results of comparing. Tracking of reference value of level or calculation of value of input signal of low-pass filter are carried out at least by two different methods. Method is chosen depending on presence or absence of dynamic mode of engine operation.

EFFECT: improved efficiency of discrimination of signals caused by knocking.

5 cl, 6 dwg

Ice control device // 2350776

FIELD: engines and pumps.

SUBSTANCE: engine electronic control unit executes program allowing computation of following magnitudes, i.e. fuel injection ratios of the injector fitted in the cylinder (S100), ignition advance with the help of the first card used when the injector fitted inside the cylinder features the fuel injection ratio equals 1. Note here that the first card ensures ignition the (S220), ignition advance with the help of the second card used for the fuel injection ratio that equals zero. Note that the second card ensures ignition time with the minimum advance (S230) and ignition advance with the help of the third card used for fuel injection ratio exceeding zero but smaller than unity. Note that the third card ensures ignition time with higher ignition advance for larger value of ratio (S240).

EFFECT: control device for ICE comprising first and second fuel injection mechanisms participating together in injecting fuel into cylinder and intake manifold and allowing accurate computation of ignition time.

5 cl, 5 dwg

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