KR890004292B1 - Apparatus for controlling idling operation of an internal combustion engine - Google Patents

Abstract

An idling operation control appts. comprises a closed-loop control system having a first output means for producing an average speed data, a second output means for producing atarget speed data, a first calculating means for producing a first control data, and a second calculating means for calculating and producing a second control data. The appts. further includes a controlling means responsive to the first control data and the second control data for controlling the position of a control member so as to control the fuel amount to be supplied to the engine before the subsequent regulation of fuel for each cylinder.

Description

Idle operation control device for internal combustion engine

1 is a block diagram showing an embodiment of the invention.

2 (a) to 2 (g) are time charts for explaining the operation of the apparatus shown in FIG.

3 is a detailed block diagram of the speed detector of FIG.

4 is a detailed block diagram of the preliminary timing detection unit shown in FIG.

5 (a) to 5 (i) are time charts for explaining the operation of the preliminary timing detection unit shown in FIG.

6 is a block diagram showing another embodiment of the present invention.

7 is a flowchart of a control program executed in the microprocessor of the apparatus shown in FIG.

8 is a detailed flowchart of a part of the flowchart shown in FIG.

* Explanation of symbols for main parts of the drawings

1,110: idle driving control device 2: fuel injection pump

3: diesel engine 4: crankshaft

7: rotation sensor 8: speed detector

10: timing detector 11: average value calculator

12: target speed calculation unit 17: injection amount adjusting member

23: actuator 24: speed difference calculation unit

27: output control unit 30: pre-timing detection unit

31: fault detection unit SW: switch

AC: AC signal D ₁ : Identification data

D _g : Preliminary identification data N _ln : Instantaneous speed data

D _O : Control output data N _t : Target speed data

: 평균속도데이터

: Average speed data

The present invention relates to an idle driving control device for an internal combustion engine, and more particularly, to adjust the feed fuel to each cylinder so that the output of each cylinder of the multi-cylinder internal combustion engine is small, and to make the idle driving safe. An idle driving control device for an internal combustion engine.

Since the fuel injection amount of the conventional multi-cylinder internal combustion engine is to control the fuel injection amount uniformly in common with the electric cylinder, the output of each cylinder does not become uniform due to manufacturing tolerances of the internal combustion engine and / or the fuel injection pump. The stability of the internal combustion engine was remarkably deteriorated during rotation, and the amount of harmful components contained in the exhaust gas was increased, resulting in inconvenience such as noise generated by the vibration of the engine.

In order to alleviate the inconvenience mentioned above, several so-called controlled fish type devices which control fuel injected into each cylinder of an internal combustion engine have been proposed. As a device of this type, for example, the average rotational speed of an internal combustion engine is obtained by sampling an integer multiple of the number of cylinders, and a target value is obtained. An apparatus for controlling the injection amount is disclosed (see JP-A-58-17642, JP-A-58-214627, and JP-A-58-214631).

However, since the above-described conventional apparatus is a so-called learning control method which predicts the next injection amount from the difference between the average engine speed and the speed of each cylinder at that time, it takes time to evaluate the learning result in the microcomputer. The problem is that the responsiveness of the system is bad and furthermore, the complicated algorithm is required to evaluate the learning results, which requires a great deal of labor in its development.

In addition, in order to perform this kind of control, it is necessary to always know at what time the explosion stroke of each cylinder is performed. However, in the conventional apparatus, the detection of this timing is performed by a signal from a sensor which electrically detects the timing of the opening valve of the fuel injection valve. And a signal from a reference timing sensor attached to the crankshaft of the engine. However, in the above-described configuration, when the sensor for detecting the opening valve timing is broken, the injection timing of the fuel becomes impossible, so that control cannot be performed properly, and the engine operation becomes rather unstable.

The object of the present invention is to achieve a responsive and adjustable amount control for each cylinder without requiring a complicated algorithm for evaluating the control result by the closed loop control according to the speed difference between the cylinders of the multi-cylinder internal combustion engine. In addition, the present invention provides a highly reliable idle driving control device for an internal combustion engine that enables identification of a timing required for each cylinder only by an output of a reference timing sensor unit.

The configuration of the present invention is a detection means for sequentially detecting the instantaneous speed at a predetermined timing of each cylinder of a multicylinder internal combustion engine, and a first operation for calculating the average speed of the internal combustion engine in response to the detection result from the detection means. Means for outputting first control data relating to the amount of fuel to be supplied to the internal combustion engine in order to obtain the target idle rotational speed in response to the operation result of the means and the target speed data; In response to the result, a means for sequentially calculating and outputting the difference data corresponding to the difference between the instantaneous speed for each cylinder and the instantaneous speed for each cylinder, which is predetermined for each cylinder, and the crankshaft are predetermined. The reference signal generator for detecting that the reference angle of In response to the difference data in response to the difference data and timing detection means for detecting the operation timing of each cylinder by a periodic change in the interval of occurrence of the output signal due to a periodic change in the instantaneous speed of the internal combustion engine. Means for calculating and outputting the second control data relating to the feed fuel necessary for zero, and the detection result by the timing detecting means, before the next fuel control stroke for each cylinder, And means for performing position control of an adjustment member for regulating supply fuel to said internal combustion engine in response to said second control data.

According to the above-described configuration, a feedback control loop is provided in which a control amount control is performed for each cylinder so that the instantaneous speed of each cylinder of the internal combustion engine is equal among the feedback control loops in which the average speed of the internal combustion engine is controlled to the desired target idle rotation speed. Therefore, the fluctuation range of each speed of the internal combustion engine can be made constant, the vibration level of the internal combustion engine can be reduced, the noise level can be lowered, and the idling rotation speed can be lowered. Therefore, idling driving can be safely performed at low fuel cost.

Furthermore, the detection of the operating timing of each cylinder required to control the instantaneous speed of each start is performed in response to an output signal from a reference signal generator that detects that a crankshaft, such as a top dead center sensor, has reached a predetermined reference angle position. It is detected by the variation of the generation period of the output signal.

That is, the instantaneous rotational speed of the engine is the smallest at the point of explosion of each cylinder, and rapidly rises after the explosion and relatively slows until the explosion of the next cylinder.

Therefore, since the time required to rotate the reference angle of the crankshaft is different before and after the explosion point of each cylinder, the operation timing of each cylinder is detected only by the information of the above-described output signal without detecting the actual injection timing of the fuel.

As a result, control can be continued even if the procedure for detecting the injection timing fails. Hereinafter, the present invention will be described in detail by way of examples.

FIG. 1 is a block diagram showing an embodiment in which the idle driving control apparatus for an internal combustion engine according to the present invention is applied to idle driving control of a diesel engine. The idle driving control device 1 is a device for controlling the idle rotational speed of the diesel engine 3 which is supplied with injection of fuel from the fuel injection pump 3.

In the crankshaft (4) of the diesel engine (3), a known rotation sensor (7) from the pulser (5) and the previous pick-up coil (6) is used to detect that the crankshaft (4) has reached a predetermined reference angle position. It is installed. In the illustrated embodiment, the diesel engine 3 is a 4-cycle 4-cylinder, and large (5a) and (5c) in the cogs (5a) to (5d) formed at intervals of 90 ° around the pulsor (5). The mutual position between the pulser 5 and the crankshaft 4 opposite the electronic pick-up coil 6 when each piston of two of the four cylinders of the diesel engine 3 reaches the top dead center. The relationship is fixed.

The instantaneous rotation speed N of the diesel engine 3 is shown in FIG. 2 (a), and the waveform of the AC signal AC obtained from the rotation sensor 7 is shown in FIG. 2 (b). . AC signal (AC) is each coil he is a waveform for causing a peak pair of positive and negative to change the portion of his level Jung each time opposed to the electronic pick-up coil (6) time of the zero crossing between the respective positive and negative peak t ₁ , t ₃ , t ₅ ,... t ₁₇ corresponds to the top dead center timing of any of the cylinder pistons of the diesel engine 3, respectively. Time t ₂ , t ₄ ,. Denotes the timing at which 90 degrees have elapsed from the top dead center on the crankshaft. On the other hand, starting t ₁ , t ₃ , t ₅ ,... t ₁₇ is the explosion timing in each cylinder, and the engine speed N increases by this explosion, and the time t ₂ , t ₄ ,... At t ₁₆ , the engine speed N starts to decrease, and the engine speed N becomes a minimum just before the explosion stroke of each of the next exploding cylinders.

The instantaneous speed of the diesel engine 3 fluctuates periodically for the above-mentioned reason, and its fluctuation period coincides with 1/2 rotation of the crankshaft 4. As shown in FIG. Incidentally, each valley of the instantaneous rotational speed N may be strictly speaking, although the piston of each cylinder may not coincide with the time of compression top dead center.

Here, four cylinders of the diesel engine 3 are referred to as cylinders C ₁ , C ₂ , C ₃ , and C ₄ , and these cylinders C ₁ to C ₄ , respectively. The following explanation will be given on the basis of the explosion stroke at the times t ₁ , t ₃ , t ₅ , and t ₇ , and then the respective cylinders entering the sequential explosion stroke in this order.

The AC signal AC is a needle valve lift sensor of the fuel injection valve mounted in the cylinder C ₁ so as to detect whether the timing indicated by each zero crossing point of the AC signal AC indicates which timing. The needle valve lifting pulse signal NLP ₁ from (9) is input to the timing detection unit 10 applied as a reference timing signal.

Needle valve to which both the pulse signal (NLP ₁₎ is the 2 (c) of the explosion timing of the cylinder (C ₁₎ as indicated in Fig _{t 1, t 9, t 17} , ... Is output just before.

The timing detector 10 is configured as a binary counter that counts the number of input pulses thereof in response to the forward pulse of the AC signal AC and returns by the needle valve lift pulse signal NLP ₁ , and counts the result thereof. The binary data to be displayed is output as the identification data D ₁ . Therefore, the identification data D ₁ can easily identify which zero crossing point in the AC signal corresponds to which operation timing in which cylinder. The identification data D ₁ is taken out through the switch SW controlled to be switched as described later and input to the speed detection unit 8.

The speed detecting section 8 is the time required for the crankshaft 4 to rotate by 90 ° after the explosion viming in each cylinder θ ₁₁ , θ ₂₁ ... θ ₄₁ , θ ₁₂ , θ ₂₂ . Is measured by the AC signal AC, and its specific circuit is shown in FIG. Referring to FIG. 3, the speed detector 8 is in phase synchronization with the AC signal AC and outputs a pulse pulse cp having a sufficiently higher frequency than the AC signal AC by the AC signal AC. And a counter 82 for counting the number of pulses of the counting pulse CP.

The counter 82 has a start terminal 82b and a counter (1) for giving a start pulse for starting the counting operation by returning the counting contents of the counter 82 other than the input terminal 82a to which the counter pulse CP is input. And a stop terminal 82c for stopping the counting operation of 82) and giving a stop pulse for retaining the counting content thereof.

The output lines 83a and 84a of the decoders 83 and 84 are connected to the terminals 82b and 82c, respectively, and the identification data is connected to these decorators 83 and 84. (D ₁ ) is input.

The identification data D ₁ indicates the number of forward pulses generated in the AC signal AC by the counter returned by the needle valve lift pulse signal NLP ₁ as described above. The timing detection unit 10 is configured such that the contents of the identification data D ₁ become zero when returned by the needle valve lift pulse signal NLP ₁ . Therefore, the content of the identification data D ₁ is t = t ₁ to 1, t ₂ to 2, t ₃ to 3, as shown in FIG. Whenever the forward pulse of the signal AC occurs, it increases one by one and becomes 0 by the needle valve lifting pulse signal NLP ₁ output immediately before t ₉ after t ₈ to 8, and then the contents are equalized. Change.

The decoder 83 sets the level of the output line 83a to the "H" level only for a short time in response to the content of the identification data D _{1 being any} of ₁ , 3, 5 and 7. The start pulse is supplied to the start terminal 82b of the counter 82.

On the other hand, the decoder 84 sets the level of its output line 84a to the "H" level only for a short time in response to the content of the identification data D ₁ being either 2, 4, 6, or 8. By this, the stop pulse is supplied to the stop terminal 82c of the counter 82.

As a result, the counter 82 counts the counting pulses CP only until the crankshaft 4 rotates 90 degrees after the explosion timings t ₁ , t ₃ , t ₅ ,... Of each cylinder. do. Thus, each time θ ₁₁ .θ ₂₁ ,... θ ₄₁ , θ ₁₂ . The count data CD corresponding to the engine speed measured by the AC signal AC is inputted from the speed detector 86. The coefficient data CD is inputted to the conversion circuit 85, where the time data ₁₁ , ₂₁ ,... The data is converted into data indicating that the data is sequentially output as instantaneous data indicating the instantaneous engine speed of the engine immediately after the explosion of each cylinder.

As described above, the time from the zero crossing point timing of the AC signal AC indicating the explosion timing of each cylinder to the next zero crossing point timing θ ₁₁ .θ ₂₁ ,. Is obtained from the speed detection unit 8, but in this specification, instantaneous speed data indicating the instantaneous rotational speed with respect to the cylinder C ₁ is generally N according to the order detected by the speed detection unit 8. _It is assumed that _ln (n = 1, 2 ...).

)와목표속도데이터(N_t)와는 가산부(13)에 있어서, 도시의 극성으로 가산되어, 그의 가산결과는 오차데이터(D_e)로서 제 1 PID 연산부(14)에 입력되어 PID제어를 위한 데이터처리가 행하여진다.Therefore, the contents of the instantaneous speed data N _ln outputted from the speed detector 8 become as shown in FIG. 2 (e). Instantaneous speed data N _ln is input to the average value calculating part 11, and the average speed of the diesel engine 3 is computed here. Displayed by the code | symbol 12 is a target speed calculating part which calculates the target idle rotational speed corresponding to the operation state of the diesel engine 3 at each time, and outputs target speed data N _t which displays the calculation result. The target speed calculating section 12 is a well-known configuration for outputting the target speed data N _t indicative of the optimum idle rotational speed in accordance with the driving conditions of the diesel engine 3 in accordance with the required driving parameters. Omitting the configuration is omitted. Average velocity data outputted from the average calculator 11

) And the target speed data (N _t ) are added in the polarity of the illustration in the adder (13), and the addition result thereof is input to the first PID calculator (14) as error data (D _e ) for PID control. Data processing is performed.

) 가 입력되어 있는 변환부(16)에 입력되고, 오차데이터(D_e)의 내용을 영으로 하기 위하여 필요한 분사량 조절부재(17)의 목표위치를 표시하는 목표위치신호(S₁)에 변환된다. 위치센서(18)는 연료분사펌프(2)의 분사량을 조절하기 위한 분사량 조절부재(17)의 그때마다의 위치를 검출하고, 그 위치를 표시하는 실제위치신호(S₂)를 출력하고 실제위치신호(S₂)는 변환부(16)부터의 목표위치신호(S₁)와 가산기(19)에 있어서 도시의 극성으로 가산된다. 가산기(19)부터의 가산출력신호는 제2 PID 연산부(20)에 입력되고, PID제어를 위한 신호처리가 시행된후, 펄스폭변조기(21)에 입력되고, 제 2 PID 연산부(20)부터의 출력에 응한 충격계수(duty cycle)의 펄스신호(PS)가 출력된다. 펄스신호(PS)는 구동회로(22)를 거쳐서 분사량 조절부재(17)의 위치제어를 행하기 위한 작동기(23)에 인가되어, 이것에 의하여 분사량 조절부재(17)에서는 디이젤기관(3)이 목표 아이들 회전속도에서 아이들 운전되도록 위치 제어된다.The result of the calculation in the first PID calculation section 14 is taken out as the data Q _lde of the dimension of the injection amount and is passed through the adding section 15 to the average speed data (

) Is input to the converting unit (16 that has been input), and is converted into the error data (D _e) a target position signal indicating the target position of the injection quantity control member 17 is required to the contents in the spirit of the (S ₁₎ . The position sensor 18 detects the position of the injection amount adjusting member 17 for adjusting the injection amount of the fuel injection pump 2, outputs an actual position signal S ₂ indicating the position, and outputs the actual position. The signal S ₂ is added to the target position signal S ₁ from the converter 16 and the polarizer shown in the adder 19. The addition output signal from the adder 19 is input to the second PID calculation section 20, and after signal processing for PID control is performed, it is input to the pulse width modulator 21, from the second PID calculation section 20. The pulse signal PS of the duty cycle according to the output of the output is output. The pulse signal PS is applied to the actuator 23 for controlling the position of the injection amount adjusting member 17 via the driving circuit 22, whereby the diesel engine 3 is driven by the injection amount adjusting member 17. The position is controlled to idle the target idle speed.

The control for matching the average idle rotational speed of the diesel engine 3 to the desired target idle rotational speed is performed by the above closed loop control system in response to the actual engine speed and the actual position of the injection amount adjusting member.

In addition, the apparatus 1 is provided with a separate closed loop control system for carrying out so-called respective control words for controlling the output of each cylinder of the diesel engine 3 to be the same. Next, the closed loop control system will be described. .

)는 속도검찰부(8)부터 새로운 순시속도데이터(N_ln)가 출력될때 마다 갱신되고, 따라서, 그 내용은 제 2(g)도에 표시한 바와같이

₁,

₂,…와 같이 변화하고 있다.The closed loop control system for controlling each cylinder is for adjusting the fuel supplied to each cylinder so that the difference in instantaneous speed of each cylinder becomes zero. The cylinders C ₁ to C ₄ in response to the instantaneous speed data N _ln . And a speed difference calculation unit 24 for calculating a difference between the reception speed for each of and the reference instantaneous speed with respect to the reference cylinder predetermined for each cylinder. In this embodiment, the instantaneous speed obtained immediately before the instantaneous speed with respect to the planted cylinder is high schooled as the reference instantaneous speed, and thus N ₁₁ -N ₂₁ , N ₂₁ -N ₃₁ , N ₃₁ -N ₄₁ . The difference data D _d is sequentially output from the speed difference calculating unit 24. The output timing of these difference data is shown in FIG. 2 (f). The instantaneous speed of each cylinder is preferably equal to each other, and the value of the difference data D _d is desired to be zero. Therefore, the difference data D _d is added to the reference data D _r having zero as content and the polarity of the illustration in the adder 25, and the addition result is the PID in the third PID calculator 26. After the processing necessary for the control is executed, it is output as the control data D _O having the dimension of the injection amount. In addition, the average speed data of the diesel engine 3 (

) Is updated every time the new instantaneous speed data N _ln is output from the speed inspecting section 8, so that the contents thereof are as shown in Fig. 2 (g).

₁ ,

₂ ,… Is changing.

₁)에 상응하는 아이들 제어량 데이터(Q_lde)와 가산되는 것으로 된다. 이 결과, 전회 속도차(N₁₁-N₂₁)를 영으로하게 분사량 조절 부재의 위치제어가 행하여져 기통(C₁)과 기통(C₂)과의 순시속도를 동등하게 하기 위한 조절량 제어가 행하여 진다.The output controller 27 depending on the difference data (D _d), identification data (D ₁₎ serves to control the output timing of the control output data (D _O) due to, is controlled as follows, whose output timing. That is, the control output data obtained at any timing (D _O) are next to the cylinder (C ₁ +1) of the cylinder (C ₁₎ and (C ₁ +1) associated with the difference data that is the basis for its control data The control unit outputs the control unit for controlling the fuel control operation of the control unit, and adds the idle control amount data Q _lde which is the output of the first PID operation unit 14 and the addition unit 15 at that time. Thus, for example, the difference data N _d (= N ₁₁ -N ₂₁ ) obtained in the addition (t ₄ ) indicates the instantaneous speed difference between the cylinder C ₁ and (C ₂ ), and thus the cylinder (C ₂ ) is output at least before the time t ₁₁ next to the explosion stroke and at a timing after the time t ₉ at which the cylinder (c ₁ ) explodes. Therefore, the control data D _O due to the difference data in this case (N ₁₁ -N ₂₁ ) is the average velocity data (

It is to be added to the idle control amount data Q _lde corresponding to ₁ ). As a result, the position control of the injection amount adjustment member is performed to make the last speed difference N ₁₁ -N ₂₁ zero, and the adjustment amount control for equalizing the instantaneous speed between the cylinder C ₁ and the cylinder C ₂ is performed. .

The above-described output control unit output difference between the cylinder (C ₂ ) and (C ₃ ), output difference between the cylinder (C ₃ ) and (C ₄ ), and between the cylinder (C ₄ ) and ( ₂ ) The same control as in the case where the output difference between the cylinders C ₁ and (C ₂ ) is zero with the output difference being zero, respectively, is performed, whereby the amount of fuel injection to be supplied to each cylinder is changed for each cylinder. Is controlled, and the output of each cylinder becomes the same.

On the output side of the output control unit 27, a switch 29 which is controlled on and off by the loop control unit 28 is provided, and the loop control unit satisfies a predetermined condition that can be performed stably with each control word. Only when detected by (28), each control word is closed by closing the switch 29, and when a predetermined condition is not satisfied, the switch 29 is opened, each control word is stopped, and each control word is It is configured to prevent the idle driving from becoming rather unstable. That is, it is preferable to perform each speed control by each control word mentioned above in the stable state in which the idling rotation speed falls in the predetermined range with respect to a desired target value.

This is because the above control words work well in the case where the dispersion of the injection system and the internal combustion engine appears regularly regularly. Therefore, when the acceleration / deceleration operation is performed or when an abnormality occurs in the control system, the idle driving becomes rather unstable when each control word is performed. Therefore, in the present embodiment, 1) the difference between the target idling speed and the actual idling rotation speed is not greater than the predetermined value a ₁ continuously for a predetermined time or more, and 2) the indentation amount of the accelerator pedal is equal to or less than the predetermined value a ₂ , and (3) The switch 29 is closed only when all the conditions, such as that the cooling water temperature is above a predetermined temperature, are satisfied to form a control loop for each control word. On the other hand, ⓐ more than the next predetermined value a ₃ (a ₁ ) between the target idle speed and the actual idle speed, ⓑ more than the predetermined value a ₄ (a ₂ ) of the indentation amount of the accelerator pedal, ⓒ control system When at least one of any of the above occurs, the switch 29 is opened to stop each control word.

In addition, in the above-described embodiment, the switch 29 is closed by the loop control unit 28, and the frequency of the pulse signal PS from the pulse width modulator 21 is not determined in relation to the rotational speed of the diesel engine. By changing the frequency of, the response of the actuator 23 is improved at each control assist. In addition, since the state of control changes depending on whether or not each control word is performed, the PID constants in the first and second PID calculation units are changed in response to the opening / closing state of the numerical value 29. It can make stable operation. As described above, if the timing detection unit 10 is configured to detect the operation timing of each cylinder necessary for performing each control word by the AC signal AC and the needle valve lift pulse signal NLP ₁ , the needle valve. When the lifting sensor 9 fails, the timing detection operation in the timing detection unit 10 becomes impossible, and the above-described control word operations are not performed. If this is left, the idle control state becomes only me. Inconvenience. In order to avoid such inconvenience, the dividing apparatus 1 includes a preliminary timing detection unit 30 for detecting the operation timing of each cylinder by only the AC signal AC, and the detection result detected by the preliminary timing detection unit 30. Preliminary identification data (DS) indicating is input to the switch SW.

) 및 실위치신호(S₂)가 입력되어 있는 고장검출부(31)가 마련되어 있고, 고장검출부(31)는 침밸브 인양 센서(9)부터 침밸브 인양펄스 신호(NLP₁)의 출력이 정지한 경우에 데이터(

)및 신호(S₂)에 의하여 기관이 무분사 운전영역에 들어가 있는가를 판별하고, 만약 무분사 운전영역에 안들어가 있는 경우에는 절환신호(HS)를 출력하고, 스취치(SW)를 실선으로 표시된 상태부터 점선으로 표시된 상태부터 점선으로 표시된 상태로 절환하여 식별데이터(D_l)에 대신하여 예비식별데이터(D_j)가 속도검출부(8) 및 출력제어부(27)에 공급된다.In order to detect whether or not the needle valve lift sensor 9 is faulty, the needle valve lift pulse signal NLP ₁ and average speed data (

) And the fault detection unit 31 to which the actual position signal S ₂ is input, and the fault detection unit 31 stops the output of the needle valve lifting pulse signal NLP ₁ from the needle valve lifting sensor 9. If the data (

) And the signal (S ₂ ) to determine whether the engine is in the non-injection operation area, and if it is not in the non-injection operation area, outputs a switching signal (HS) and displays the squelch (SW) in solid line. From the state indicated by the dotted line to the state indicated by the dotted line, the preliminary identification data D _{j is} supplied to the speed detection unit 8 and the output control unit 27 in place of the identification data D _l .

추력이 얻어진다(제 5(c)도, 제 (d)도).4 is a detailed block diagram showing the configuration of the preliminary timing detection unit 30. As shown in FIG. The preliminary timing detection section 30 has a waveform shaping circuit 90 for waveform shaping the AC signal AC (see also fifth (b)), and the forward pulse of the AC signal AS starts from the wave unsettling circuit 90. The basic pulse string signal P _a is outputted from the pulse corresponding to (Fig. 5 (b)) The basic pulse string signal P _a is input to the T flip-flop 91, and the T flip-flop 91 Is operated at the rising timing of each pulse of the basic pulse train signal P _a ,

Thrust is obtained (fifth (c) and (d)).

출력이 앤드 게이트(93)의 다른쪽의 입력에 인가되어 있다.Is applied to the basic pulse signal (P _a) is the other input of the AND gate 92, 93 and each is applied to the input of the one, the Q output AND gate 92 of,

An output is applied to the other input of the AND gate 93.

출력이 "H"레벨에 있을 때에만 열려진다. 이 결과 앤드 게이트(92)부터는 기본펄스열신호(P_a)를 구성하는 펄스가 하나씩 건너서 끄집어 내어져 이들의 펄스부터된 펄스열신호가 제 1 펄스열신호(P_a1)로서 출력된다.(제 5(e)도).Thus, the AND gate 92 is opened only when the Q output is at the " H " level so that the AND gate 93 is closed.

Open only when the output is at the "H" level. As a result the AND gate 92. Since adjuster within the pulses that make up the basic pulse signal (P _a), one pull across a pulse train signal from those of the pulse is output as the first pulse train signal (P _a1). (The 5 (e )Degree).

On the other hand, the AND gate 93. Since the basic pulse signal (P _a), the Configuration pulse of the first pulse train signal (P _a1) the configuration of the pulse train signal adjuster within the pull that is not corresponding pulse to pulse, since these pulses to Is output as the second pulse train signal Pa _a2 (fifth (f)).

Thus, as already explained. It is assumed that the top dead center timing of the cylinder piston immediately before the pulse of the pulse train signal output from either of the AND gates 92 and 93 enters the explosion stroke in each cylinder.

In this case, as shown immediately in FIG. 5 (a) or 5 (b), the top dead center timings of the cylinder pistons before the explosion stroke of any cylinder are set by the pulses constituting the first pulse train signal Pa _a1 , respectively. It is displayed. In order to discriminate this fact from the difference between the time intervals of adjacent pulses in the basic pulse train signal P _a without using the needle valve lift pulse signal NLP ₁ , the first and second pulse train paths P _a1` ) and counters 94 and 95 which are controlled by (P _a2 ) are provided. These counters 94 and 95 have the same structure as the counter 82 shown in FIG. 3, and each input terminal 94a and 95a has a period sufficiently shorter than that of the AC signal AC. The counting pulse P _a is input from the pulse generator 96. The first pulse train signal Pa _a1 is input to the start terminal 94b of the counter 94 and the stop terminal 95c of the counter 95, and the stop terminal 94c and the counter 95 of the counter 94. The second pulse train signal Pa _a2 is input to the start terminal 95a of.

Accordingly, the counter 94 is returned by any pulse of the first pulse train signal Pa _a1 to start counting the number of occurrences of the count pulse P _a , and then the second pulse train signal Pa _a2 which is initially output. The counting operation is stopped by the pulse of to keep the counting content. The output data of the counter 94 is input to the latch circuit 97 which latches the input data in response to the second pulse string signal _{Pa a2} , so that the counting content of the counter 94 is directly viewed by the latch circuit 97. ) Is latched.

The counter 5 is wired so that the counting operation is started by the pulse of the second pulse train signal Pa _a2 , and the counting operation is stopped by the pulse of the first pulse train signal Pa _a1 .

The counting content of the counter 95 is latched in the latch circuit 98 in response to the pulse of the first pulse string signal Pa _a1 . Thus, the counter 94 is a first pulse train signal (P _a1) a from be pulse is output to the configuration, the second pulse train signal is time until the output following the pulse constituting the (P _a2), T _11, T _12, T ₁₃ ,.. Corresponding to data DT ₁₁ (DT ₁₂ ) (DT ₁₃ ). And the data thereof is latched to the latch circuit 97 at the above-described timing (see also the fifth (e), the fifth (f), and the fifth (g)). The same counter (95) is a second pulse train signal (P _a2) a configuration following the time of until the pulse is output from be pulse is output, constituting the first pulse train signal (P _a1) T _21, T _22, T ₂₃ ,.. Corresponding to data DT ₂₁ , DT ₂₂ , DT ₂₃ . The data is output to the latch circuit 98 at the timing described above (see also the fifth (e), the fifth (f), and the fifth (h)).

The contents of the latch circuits 97 and 98 are input to the comparison circuit 99 to determine which latch data is small, and the data G ₁ indicating the determination result is the first and second pulse string signals ( P _a1), it is given as the selection control data to the selector 100, that is applied (P _a2). The selector 100 selectively picks out one of the signals P _a1 and P _a2 , and is applied as a latch signal to the latch circuit latching larger data among the latch circuits 97 and 98. Select the pulse train signal on the side. Thus, by this case, the side of the contents of the latch circuit 98 is larger than the contents of latch circuit 97, a latch circuit (98) a first pulse train signal (P _a1) is applied to the selector 100 It is selected and input to the quaternary counter 101 as a counting pulse signal.

That is, the pulse train signal from the pulses indicating the top dead center timing of the cylinder piston just before the explosion stroke of each cylinder is selected by the counting results of the counters 94 and 95. The contents of four binary counter 101 is therefore claim 5 (i) to increase the individual pulses constituting the first pulse train signal (P _a1) one by one each time the input, as shown in Fig., And repeating the counting from 0 to 3 It becomes. Therefore, the output data from the quaternary counter 101 becomes identification data specifying the cylinder in the explosion stroke at that time, and is output as preliminary identification data D _j . In addition, depending on the contents of the preliminary identification data (D _j ), it is not possible to display which of the cylinders (C ₁ ) to (C ₄ ) is in the explosive stroke in correspondence with each other. There is no problem in executing the control word, and each control word can be executed normally by the preliminary identification data (D _j ).

For this reason, even if the needle valve lifting sensor 9 fails, each control word can be continued normally.

In the above embodiment, the preliminary identification data (D _j ) is provided to the control and the like only when the needle valve lift sensor 9 fails, but a circuit shown in FIG. 4 is provided at all times instead of the timing detector 10. The identification data may be supplied to the speed detection unit 8 and the output control unit 27 regardless of the needle valve lifting signal NLP ₁ from the needle valve lifting sensor 9. According to the above-described configuration, control of transient changes such as under shoot of engine speed and idle rotational speed to target values by the closed loop control resulting from the average speed of the diesel engine and the position of the injection amount adjusting member. Control is performed so that control is performed such that the respective speed fluctuations of the respective cylinders are made equal by the respective control words in the state where the idle rotational speed is almost stable.

Even when each control word is executed, the average speed is controlled, and the placenta of the output quantity is in charge, and each control word performs a function of correcting it. Even if the needle valve lifting sensor is broken, each control word can be continued without any inconvenience, and thus satisfactory in terms of reliability.

In addition, as described above, each control word is configured to be executed only when the idle rotational speed is near the target value, but in this area, the gain of the control of the average idle rotational speed is set small, and has a great influence on the operation of each control word. It is not supposed to give.

Further, in the above embodiment, since the cylinder from which the cylinder is placed to reach the compression top dead center until the crankshaft rotates by 90 ° is used as the basis for detecting the angular velocity of each cylinder, the variation of the explosion torque is best detected. It is possible to contribute to the improvement of the control function.

FIG. 6 shows another embodiment of the present invention in which the idle operation control device 1 shown in FIG. 1 is realized by using a microcomputer. The same code | symbol is attached | subjected to the part same as the part shown in FIG. 11 among the parts of the idle driving control apparatus 110 shown in FIG. 6, and the description is abbreviate | omitted. The reference numeral 111 denotes a waveform typical circuit having the same function as the waveform shaping circuit 90 shown in FIG. 4, and the waveform shaping circuit 111 converts the AC signal AC into waveform shaping. The top dead center pulse (TDC), the needle valve lift pulse signal NLP ₁ from the needle valve lift sensor 9 and the actual position signal S ₂ from the position sensor 18 are read-only memory (ROM) 112. Is input to the microcomputer 113 provided with (). In the ROM 112, a control program for achieving a function equivalent to the idle rotational speed control executed by the apparatus shown in Fig. 11 is stored, and this control program is executed by the microcomputer 113. By this, required idle rotation speed control is performed.

7 shows the flowchart art of the control program stored in the ROM 112. As shown in FIG. The control program is outside the main control program 122 from the step 120 of initializing after the start of the program and the step 121 of calculating the target injection amount and controlling the position of the injection amount adjusting member 17 in response to the operation amount of the accelerator pedal. An assignment program INT ₁ to be executed in response to the output of the needle valve lifting pulse signal NLP ₁ and a separate assignment program INT ₂ to be executed in response to the output of the top dead center pulse TDC.

The assignment program INT ₂ first sets the contents of the soft counter TDCTR to 8 in step 123, and then terminates execution with the flag TF of " 0 ". This flag TF is a flag for determining whether or not to calculate the injection amount data Q ₁ or output the calculated injection amount data Q _{1 in} the allocation program 2 described later. The assignment program INT ₂ is executed in response to the occurrence of the top dead center pulse TDC, and the content of the soft counter TDCTR is decremented by 1 (step 125) to determine whether TDCTR = 0 or not at step 126. Is executed.

If TDCTR = 0, the process proceeds to step 127, after setting the contents of the soft counter TDCTR to 8, the process proceeds to step 128 and the flag TF is inverted. If the determination result of step 126 is No, the process proceeds to step 128, and the flag TF is inverted. Thereafter, data M ₁ , M ₂ ... Indicating the time intervals between adjacent pulses by the intervals of occurrence of the top dead center pulse TDC. Is calculated, whereby the rotational speed is calculated (step 129).

Data M ₁ , M ₂ ... Is the time T ₁₁ , T ₂₁ , T ₁₂ ,. It is used later to indicate. Next, in step 130, a determination is made as to whether or not the needle valve lifting sensor 9 is broken.

)와의 차(

-N_t)의 치가 소정시간 이상 연속하여(a₁)이상인가 아닌가의 판별을 행하고, 단계(131) 내지 (133)의 판별결과가 모두Yes의 경우에만, 아이들 운전을 위한 순시기관속도에 기인하는 각 통제어 연산이 실행되고(단계 134), 단계(135)에 있어서 평균기관속도에 기인한 아이들 회전속도가 각통 제어연산의 연산결과를 고려하여 행하여진다.This determination is determined to be a failure NG when the contents of the counter TDCTR are larger than 8 and it is detected that fuel injection is in progress. If the needle valve lifting sensor 9 is not broken, in step 131 to 133, whether or not the cooling water temperature TW of the engine is equal to or higher than the predetermined value T _r , or the intake amount of the accelerator pedal? Is it less than or equal to this predetermined value a ₂ , or is the target idle rotational speed N _t and the average idle rotational speed (

Difference with)

-N _t ) determines whether or not the value of (N ₁ ) is more than a predetermined time (a ₁ ) or more, and only when the determination results of steps 131 to 133 are all Yes, due to the instantaneous engine speed for idle operation. Each control word operation is executed (step 134), and in step 135, the idle rotational speed due to the average engine speed is performed in consideration of the calculation result of the cylinder control operation.

On the other hand, when the discrimination result in at least one of steps 131 to 133 is No, each control word operation in step 132 is not executed, and only the idle rotation control by the average engine speed is executed. .

In addition, when the cooling water temperature is low, the combustion is unstable, so that the explosion does not show the same tendency, and the magnitude of the output torque becomes unstable, thereby guaranteeing periodic fluctuations in the same tendency of combustion occurring in each cylinder which is the premise of each control word. It doesn't work.

In this way, the state of the cooling water temperature is considered to be one of the factors for determining the preconditions when each control word is performed. Therefore, the cooling water temperature is configured to allow each control word in the case of T _w T _r .

When the needle valve lifting sensor 9 is broken, it is determined in step 136 whether or not the flag FATC indicating whether or not each control word is performed is "1", and if FATC = "1", step 131 If FATC = " 0 ", step 137 is reached. In step 137, it is judged whether or not the idle driving state has been continued for a predetermined time T _o or more, and if the determination result is N _o , the process proceeds to step 135; Proceed to (138).

In step 138, the data M _n obtained in the execution of the current allocation program INT2 among the data indicating the time intervals of the top dead center pulses TDC adjacent to each other and at the time of execution of the allocation program INT2 of one revolution are executed. Consumption with the data M _n-1 obtained in FIG. As described above, the pulse interval of the top dead center pulse TDC is generated by alternating between the long state and the short state, so that the state of the operation timing of each cylinder is determined by comparing the data M _n and M _n-1. You can do it.

M_n-1이면, 금회의 할입프로그림(INT2)의 실행을 행하게한 상사점 펄스(TDC)에 대응하는 기통이 폭발행정의 중간에 달한 타이밍(제 2 도에서 t₂, t₄, t₆,…에 상응하는 타이밍)을 표시하는 펄스였던 것이 된다.If, M _n

If M _n-1 , the timing at which the cylinder corresponding to the top dead center pulse (TDC) that caused the current installment program (INT2) to be executed reaches the middle of the explosion stroke (t ₂ , t ₄ , t ₆ in FIG. 2). Timings corresponding to ...).

M_n-1이면 어느것의 기통이 폭발행정에 들어 가기전에 그의 실린더 피스톤이 상사점에 달한 타이밍 (제 2 도에서 t₁, t₃, t₅,…에 상응하는 타이밍)을 표시하는 펄스였던 것이 된다.Meanwhile, M _n

If M _n-1 , it was a pulse indicating the timing at which the cylinder piston reached its top dead center (timing corresponding to t ₁ , t ₃ , t ₅ ,… in Figure 2) before any cylinder entered the explosion stroke. do.

Therefore, when the determination result of step 138 is No, each control word operation is not performed, but it progresses to step 135, and when the determination result is Yes, it progresses to step 139, and the flag FN is carried out. Is determined to be " 1 ". The flag FN is provided to determine whether or not the determination result of step 137 is Yes. If (FN) is "0", the determination result of step 139 is No. In step 140, FN = " 1 " and the content of variable N becomes the content of counter TDCTR and proceeds to step 135. Therefore, the determination result of step 139 becomes YeS from next time, and it progresses to step 141. FIG. In step 141, K = K + 1, and then, determination of whether K = 4 or not is performed in step 142. K is enlarged one by one whenever any cylinder becomes an explosive stroke. If the result of the determination of step 142 is No, step 135 is reached. If the result of the determination in step 142 is Yes, the process proceeds to step 144, where a determination is made as to whether or not the value of the variable N coincides with the value of the counter TDCTR to pass one cycle (720 degrees crankshaft rotation). If N = TDCTR, the process proceeds to step 145, where FATC = "1", TDCTR = 8, and TR = "0", and then proceeds to step 135. If the discrimination result of step 144 is No, the process proceeds to step 143, where K = "0", FN = "0", and the process proceeds to step 135. FIG.

In this way, if it is determined that the needle valve lifting sensor 9 is not a fault, the process proceeds directly to step 131. However, when the needle valve lifting sensor 9 is broken, the comparison between the data M _n and M _n-1 is large. By performing the operation, the operation timing of each cylinder of the engine is determined at each time, and each control word calculation step 134 is executed in accordance with this determination result.

Next, each control word operation displayed in step 134 will be described with reference to the detailed flow chart in FIG. First, when the flag TF is determined in step 150 and the flag TF is " 0 ", a step for calculating the control data for each control word is executed later, while the flag TF If) is set to "1", the step for outputting control data for each control word is subsequently executed. The case where the flag TF is " 0 " means that even top dead center pulse TDC has not yet been output since the needle valve lift signal NLP1 is output. That is, each cylinder is a period in which none is in the explosive stroke, and in FIG. ₂ , t ₂ -t ₃ , t ₄ -t ₅ , t ₆ -t ₇ ,. Corresponds to each period of. On the other hand, if the flag TF is " 1 ", as is known from the above description, it is a period in which one of the cylinders is in the explosive stroke, and in FIG. 2, t _1- t ₂ , t ₃ t ₄ , t ₅ , t ₆ ,… Corresponds to each period of. If the flag TF is " 0 ", in step 151, it is judged whether or not the operating condition of the engine at that time satisfies the necessary condition for executing each control word, and when the determination result is No, each The content of the data indicating the fuel injection control amount to each cylinder for the control word is zero (step 152). In the present specification, the injection amount control data for each control word is expressed in general (Q _Ain ). Here, i denotes a cylinder number, and (n) denotes a calculated timing of this data. Subsequently, in step 153, the calculation of the injection amount control data Q ₁ for the idle rotation control by the average speed is performed. In step 154, the next operation performed before this cycle to the control data Q ₁ is performed. Addition of the injection amount control data QA _{(1 ‡ 1) n-1)} for the cylinder is taken as the control data Q ₁ . This control data Q ₁ is stored in the RAM 114 in the microcomputer 113.

If the result of the determination in step 151 is Yes, in step 155, it is due to the velocity N _ln due to the top dead center pulse TDC outputted this time and the top dead center pulse TDC output before one. The difference (N _ln ) from the speed N _{(1 ‡ 1) n} is calculated, and then in step 156, the difference from the difference (N _{1) n-1)} obtained in step 155. The minute N ₁ is calculated. Then, in step 157, each constant for PID control is set, and the load of the integral term I _ATC i is performed (step 158).

In this way, PID control operation is performed (step 159), and the resultant control data Q _{Ain for each} cylinder control is stored (step 160). In this case, therefore, the value of the data stored in step 160 and the previous value of the data Q ₁ are added to the final data Q ₁ . When the determination result of step 150 is YES, the value of the data Q ₁ at that time is added to the value of the control data Q _APP corresponding to the indentation amount of the accelerator pedal to make the data Q _DRV . At that time, the control unit outputs the injection amount control data to the cylinder in the compression stroke (step 162).

As can be seen from the above description, when the needle valve lift sensor 9 is normal, the operation and output of the control data for each control word are controlled by the flag TF, and the needle valve lift sensor 9 fails. The execution timing of the calculation of each control word is determined by comparing the data (M _n ) with (M _n-1 ), whereby each control word is determined in spite of the failure of the needle valve lifting sensor (9). You can do it.

According to the present invention, since each control word is performed to make each speed fluctuation width of each cylinder constant, vibration of the engine can be reduced, noise level can be lowered, and further, idling rotation speed can be lowered. Unlike the method, the operation processing is easy and the configuration is simple.

In addition, since the operation timing of each cylinder can be identified without a signal indicating the actual injection timing, the effect of remarkably increasing the reliability of the apparatus is achieved.

Claims (1)

Detection means for sequentially detecting the instantaneous speed at the timing of each cylinder of the multi-cylinder internal combustion engine, and first arithmetic means for clearing the average speed of the internal combustion engine constantly in response to the detection result from the detection means and rotation of the target children required First control data relating to the amount of fuel to be supplied to the internal combustion engine in order to obtain a target idle rotational speed in response to the means for outputting target speed data indicating the speed and the arithmetic result of the first calculating means and the target speed data; And the difference data corresponding to the difference between the instantaneous speed for each cylinder and the instantaneous speed for the predetermined cylinder for each cylinder in response to the detection results sequentially output from the detection means. Means for sequentially calculating and outputting the cylinder, and checking that the crankshaft has reached a predetermined reference angle position. Timing detection means for detecting an operation timing of each cylinder by a cyclic variation in the generation interval of the output signal due to a cyclic variation in the instantaneous speed of the internal combustion engine in response to a reference signal generator and an output signal from the reference signal generator; Means for calculating and outputting second control data relating to the feed fuel necessary for zeroing the difference indicated by the difference data in response to the difference data, and for the respective cylinders based on the detection result by the timing detection means. Means for performing position control of an adjustment member for regulating the supply fuel to the internal combustion engine in response to the first control data and the second control data prior to the fuel control stroke of the internal combustion engine. Operation control device.

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