KR100476197B1 - Method for a cylindgr discernment on a motor - Google Patents

Abstract

Missing Tooth is detected by comparing three period values of square wave pulse detected from crank position sensor in internal combustion engine, and cylinder discrimination for fuel injection and ignition control is performed through counter based on detected Missing Tooth. To do.

The present invention relates to a method for determining a cylinder by using a detection of a missing tooth and a phase of a missing tooth,

Determining whether the detected missing tooth is set to zero for a down counter set for each cylinder; If the down counter is not '0', the down counter is repeatedly executed until '0'. If the down counter is detected as '0', 1 is added to the currently controlled cylinder number, and the number of cylinders installed in the engine Determining whether the value is greater; Determining the cylinder by determining that cylinder number 1 is in a compression stroke when it is determined to maintain a value larger than the number of cylinders mounted on the engine; And a cylinder determining that the calculated cylinder is in a compression stroke when the added cylinder does not exceed the number of cylinders mounted on the engine.

Description

METHODE FOR A CYLINDGR DISCERNMENT ON A MOTOR}

The present invention relates to an internal combustion engine, and more particularly, to detect a missing tooth by comparing three period values of a square wave pulse detected from a crank position sensor, and through a counter based on the detected missing tooth. The present invention relates to a cylinder discrimination method of an internal combustion engine for performing cylinder discrimination for fuel injection and ignition control.

In the internal combustion engine with electronic control device, the signal of crank position sensor is needed to control the fuel injection amount and the ignition timing. In this signal of the crank position sensor, the signal of Missing Tooth is based on the signal for discriminating each cylinder. It plays an important role in determining fuel injection and ignition timing for each cylinder.

The control device of the internal combustion engine for controlling the fuel injection amount and the ignition timing is installed in the form of a disc on the crankshaft, as can be seen in the accompanying FIG. 1, and is provided for detecting the position information of the crankshaft on the outer periphery of the disc. The number of sensors, preferably 30 slots are formed and a slot for detecting a phase signal on the inner circumference of the sensor 10 and the signal detected from the slot formed on the outer circumference of the sensor 10 is switched to crank position information A first transistor (Q1) for interrupting the signal, a second transistor (Q2) for interrupting a phase signal by switching to a signal detected from a slot formed on the inner circumference of the sensor (10), and the first and second The controller 20 analyzes the crank position information and the phase signal interrupted through the transistors Q1 and Q2 to determine the cylinder, determine the ignition timing, and determine the fuel injection amount. And an ignition device 30 generating an ignition spark in each cylinder determined according to the control signal applied from the control unit 20 and calculated in each cylinder determined according to the control signal applied from the control unit 20. It consists of an injector 40 for injecting a fuel amount.

Referring to the operation for the cylinder discriminating conventionally performed in the internal combustion engine control apparatus as described above are as follows.

When the engine is kept on, the transistors Q1 and Q2 are switched by a signal that is photo-interrupted as the disk-shaped sensor 10 installed in the crankshaft rotates, and the square wave as shown in FIG. 3 is switched. The crank position signal and the phase signal of are interrupted to the control unit 20 in the form of 'high' or 'low' (S10).

At this time, the control unit 20 calculates the square wave pulse of the crank position signal to be interrupted to detect whether or not there is a missing tooth (S11).

The above operation for missing machine detection is detected by determining whether or not the period t of the current square wave pulse has a value larger than twice the period t-1 of the immediately preceding square wave pulse.

In operation S12, when a missing signal is detected in the crank position signal, it is determined whether the phase of the interrupted phase signal is detected as 'low' (S12).

For example, when the phase signal interrupted in the state that the sewing machine is detected as 'low' is detected based on BTDC120 ° as shown in FIG. 3, the counter for cylinder discrimination is set to '0' and the cylinder discrimination is performed. The condition is initialized and returned to the initial operation (S13).

That is, if the phase signal is 'low' at the first falling edge after the pulse of Missing Tooth, cylinder discrimination is performed by recognizing the compression stroke of cylinder 1.

If a missing tooth is not detected in the calculation of S11, a square wave pulse for cylinder discrimination is counted (S14) to determine whether the number of counters, that is, the number of falling edge counters of the square wave pulse is detected as a first set number, for example, 12. (S15).

When the number of counters of the square wave pulse is detected as the first set number, it is recognized as the compression stroke of the third cylinder, and after performing cylinder identification as shown in FIG. 3, the counter number of the square wave pulses is returned. If the number of settings, for example, 12 or more, is detected, it is determined whether the number of counters is detected as the number of second settings, for example, 27 (S17).

When the number of counters is detected as the second set number, it is recognized as the compression stroke of cylinder number 4, and then cylinder identification is performed as shown in FIG. 3 (S18). If detected, it is determined whether the number of the third set number, for example, 40 is detected (S19).

When the number of counters is detected as the third set number, the number of counters is recognized as the compression stroke of the second cylinder, and then cylinder identification is performed as shown in FIG. 3 (S20). If detected, it is determined whether the number is detected as the fourth set number, for example, 55 (S21).

When the number of counters is detected as the fourth set number, cylinder 1 is recognized as a compression stroke, and cylinder identification is performed as shown in FIG. 3, and then returned (S22). If detected, it returns to the state of not performing cylinder discrimination (S23).

As described above, the sewing machine detection method for cylinder discrimination applied in the conventional internal combustion engine compares the period of the square wave pulse detected from the current crank position sensor with the previous period for each counter, and thus the period of the current square wave pulse number is determined. In the case of being detected as a period twice the previous square wave pulse period, a method of determining as missing is applied.

Therefore, when the noise is introduced into the square wave pulse detected from the crank position sensor or the square wave pulse detected by other influences is not deformed or detected, the engine controller may be mistaken for the detection of the sewing machine.

Therefore, a problem occurs that causes misfire and engine relief for each cylinder plate which is not normal.

The present invention has been invented to solve the above problems, and its object is to present a square wave pulse detected from a crank position sensor in detecting a missing tooth for cylinder discrimination for ignition timing and fuel injection amount control in an internal combustion engine. By comparing the three periods of the period, the previous period, and the previous period, the noise is introduced to provide stability for the detection of the missing machine even if noise is introduced.

The present invention for realizing the above object in the method for determining the cylinder by using the detection of the missing machine and the phase of the sewing machine, the process of determining whether the down counter set by the cylinder for the detected missed tooth is '0' and; If the down counter is not '0', the down counter is repeatedly executed until '0'. If the down counter is detected as '0', 1 is added to the currently controlled cylinder number, and the number of cylinders installed in the engine Determining whether the value is greater; Determining the cylinder by determining that cylinder number 1 is in a compression stroke when it is determined to maintain a value larger than the number of cylinders mounted on the engine; And a cylinder determining that the calculated cylinder is in a compression stroke when the added cylinder does not exceed the number of cylinders mounted on the engine.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As can be seen in Figure 4 in the internal combustion engine according to the present invention the operation of the cylinder discrimination through the sewing machine detection is as follows.

When the engine of the internal combustion engine is kept on, as shown in FIG. 1, the transistors Q1 and Q2 are driven by a signal that is photointerrupted as the disk-shaped sensor 10 installed in the crankshaft rotates. By switching, the crank position signal CPS and the phase signal of the square wave pulse as shown in FIG. 5 are interrupted to the controller 20 in the form of 'high' or 'low'.

At this time, the control unit 20 determines whether or not the setting (C_bmsuch = 1) is set because no missing teeth are detected in the crank position signal CPS interrupted by the sensor 10 (S101).

In the state where the missing tooth is set as not detected (C_bmsuch = 1), the pulse width of the period tbm1_w one cycle before the current cycle tbm_w is two cycles before the current cycle tbm_w (tbm2_w). (Tbm1_w < tbm2_w * 2) is determined whether the value is smaller than twice the pulse width (S102).

The pulse width of the period (tbm1_w) one cycle before the current period (tbm_w) is determined to have a value less than twice the pulse width of the period (tbm2_w) two cycles earlier than the period of the current (tbm_w). If it is determined that there is no sewing machine in the crank position signal CPS detected by the current sensor 10, the process returns to repeat the above-described process.

If it is determined that the pulse width of the period (tbm1_w) one cycle before the current period (tbm_w) has a value larger than the value of twice the pulse width of the period (tbm2_w) two cycles earlier than the current period (tbm_w), It is determined whether the pulse width of the period tbm1_w one cycle before the period tbm_w has a value smaller than the value of twice the pulse width of the current period tbm_w (tbm1_w <tbm_w * 2) (S103).

The crank position detected from the current sensor 10 when the pulse width of the period tbm1_w one cycle before the current period tbm_w has a value smaller than twice the pulse width of the current period tbm_w. It is determined that there is no missing tooth in the signal CPS and is returned to repeat the above-described process.

The crank position detected from the sensor 10 when it is determined that the pulse width of the period tbm1_w one cycle before the current period tbm_w has a value larger than the value of twice the pulse width of the current period tbm_w. It is determined that the signal (CPS) contains Missing Tooth, the mark for cylinder discrimination is turned on (Reference mark on), and the flag for Missing Tooth Detection is set (C_bmsuch = 0) and then set based on BTDC72 °. One first setting down counter, for example, 14 down counts is set (zzseg = 14) (S104).

If a missing tooth is detected in the crank position signal CPS detected above, cylinder 1 or cylinder 3 has entered a compression stroke, and thus, a phase signal detected from the sensor 10 for accurate cylinder discrimination. It is determined whether is detected as having a phase equal to the sewing machine (Phase = 1) (S105).

If the phase signal is detected in the same phase as the sewing machine, cylinder 1 is determined to be in a compression stroke state (S106). If the phase signal and the sewing machine are detected in different phases, cylinder 3 is compressed. The cylinder is discriminated to have (S107) to control the ignition timing and the fuel injection amount.

Further, through the above operation, the number of down counters is set according to the detection of the sewing machine and the number of down counters of the crank position signal (CPS) detected from the sensor 10 is set by performing cylinder identification. It is determined whether 0 'is detected (zzseg = 0) (S110).

If the down counter is not detected as '0' in the above, it is determined that the counter set until the next cylinder is not performed, and the down counter is repeatedly repeated (zzseg--) (S130). After the mark for discrimination is turned on (Reference mark on) (S111), 1 is counted up to cylinder number immediately before the ignition timing and fuel injection amount control are performed (cylnum ++) (S112).

Subsequently, it is determined whether the number of the up-counted cylinders exceeds the maximum number of cylinders of the corresponding engine, for example, whether the number of up-counted cylinders exceeds the number '4' (S113). , If it is determined that the maximum number of cylinders is exceeded, it is determined that the next cylinder for cylinder determination is the first cylinder (S114).

As described above, if the cylinder for cylinder discrimination and the cylinder discrimination mark are turned on according to the down counter of the crank position signal CPS, whether the missile tooth is included in the crank position signal CPS detected from the sensor 10 (B_luecke = 1 It is determined whether or not (S115).

If the crank position signal (CPS) detected above does not include a sewing machine, it is determined that the next cylinder of the currently controlled cylinder has entered a compression stroke, and then sets the number of set down counters. Repeat the process (S122).

If no sewing machine is detected in the process of the number of down counters set for the crank position signal (CPS), the pulse width of the period (tbm2_w) two cycles earlier than the current period (tbm_w) is 1 than the current period (tbm_w). It is determined whether it has a value larger than the pulse width which doubled the period before the cycle (tbm1_w) (tbm2_w> tbm1_w * 2) (S116).

If the pulse width of the period (tbm2_w) two cycles earlier than the current period (tbm_w) has a value larger than the pulse width of twice the period (tbm1_w) one cycle before the current period (tbm_w) -1 to the down counter value By subtracting the crank position signal (CPS) is corrected (bmcor = -1) and then the cylinder discrimination is performed (S117).

If the pulse width of the period (tbm2_w) two cycles earlier than the current period (tbm_w) has a value smaller than the pulse width that doubles the period (tbm1_w) one cycle before the current period (tbm_w), one cycle than the current period (tbm_w) It is determined whether or not the pulse width obtained by doubling the previous period tbm1_w has a larger value than the current period tbm_w (tbm_w <tbm1_w * 2) (S119).

If it is determined that the pulse width which doubles the period (tbm1_w) one cycle before the current period (tbm_w) has a value larger than the current period (tbm_w), +1 is added to the down counter value (bmcor = + 1 ) After the crank position signal CPS is corrected (S120), cylinder discrimination is performed, and a pulse width in which the period (tbm1_w) is doubled one cycle before the current period (tbm_w) has a value smaller than the current period (tbm_w). In this case, cylinder discrimination is performed by applying the current down counter value as it is (bmcor = 0) (S121).

As described above, the present invention compares the pulse width of the signal of the crank position sensor with respect to three periods in performing the cylinder discrimination for ignition timing and fuel injection amount control in the internal combustion engine. Even if it is detected, it is not detected by Missing Tooth, which provides stability and reliability to cylinder discrimination, thereby providing stability to engine control.

1 is a block diagram of a cylinder determination and control device of a general internal combustion engine.

2 is a flow chart for cylinder determination performed in a conventional internal combustion engine.

3 is a waveform diagram showing a waveform of a crank position sensor value and a counter for explaining cylinder discrimination performed in a conventional internal combustion engine;

Figure 4 is a flow chart for the cylinder discrimination performed in the internal combustion engine according to the present invention.

5 is a waveform diagram showing a waveform and a counter of a crank position sensor value for explaining cylinder discrimination performed in an internal combustion engine according to the present invention;

Claims (9)

In the method for determining the cylinder by using the detection of the missing tooth and the phase of the missing tooth, Determining whether the detected missing tooth is set to zero for a down counter set for each cylinder; If the down counter is not '0', the down counter is repeatedly executed until '0'. If the down counter is detected as '0', 1 is added to the currently controlled cylinder number, and the number of cylinders installed in the engine Determining whether the value is greater; Determining the cylinder by determining that cylinder number 1 is in a compression stroke when it is determined to maintain a value larger than the number of cylinders mounted on the engine; And a cylinder discriminating that the calculated cylinder is in a compression stroke when the added cylinder does not exceed the number of cylinders mounted on the engine. delete delete delete delete delete delete The method of claim 1, Determining whether missing teeth are detected in the crank position signal detected when the cylinder in the compression stroke is determined through the down counter; Determining whether a pulse width of a period before two cycles of the current period has a value greater than a pulse width twice the period before one cycle of the current period in the crank position signal when the missing tooth is detected; If the pulse width of the period two cycles before the current period has a value larger than the pulse width doubled one cycle before the current cycle, the cylinder is determined by subtracting -1 to the counter value by determining that the down counter is missing. Process of doing; If the pulse width of the period two cycles before the current period has a value smaller than the pulse width twice the period one cycle before the current period, the pulse width twice the period one cycle before the current period is the pulse width of the current period. Determining whether the value has a larger value; Determining a cylinder by adding and correcting +1 to a counter value when the pulse width which doubles one period before the current period has a value larger than the pulse width of the current period; And determining the cylinder from the current value by determining that a normal down counter has been made if the pulse width which doubled the period before one cycle of the current cycle does not have a value larger than the pulse width of the current cycle. A cylinder discrimination method of an internal combustion engine. Detecting a crank position signal and phase; Comparing the three periods of the pulses of the crank position signal and detecting whether a sewing machine is included; Determining a cylinder of the compression stroke according to the detection of the sewing machine; Determining a cylinder of a compression stroke through a down counter of the crank position signal; And determining a cylinder of a compression stroke by compensating for an error of the down counter.