KR890004293B1 - 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 a target 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 for supplying the second data to the closed-loop controlling means, wherein the controlling means operates to control the speed regulating means in response to the first and second control data.

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 difference art 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 block diagram showing another embodiment of the present invention constructed using a microcomputer.

5 is a flowchart art of a control program executed in the microcomputer of the apparatus shown in FIG.

6 is a detailed flowchart of a part of the flowchart art shown in FIG.

* Explanation of symbols for main parts of the drawings

1,40: idle driving control device 2: fuel injection pump

3: diesel engine 4: crankshaft

7: rotation sensor 8: speed detector

10: timing detection unit 11: average value calculation unit

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

23: actuator 24: speed difference calculation unit

27: output control unit 30: each cylinder control release unit

31 switch 32 water temperature sensor

AC: AC signal D ₁ : Identification data

N _in : Instantaneous speed data D ₀ : Control output data

: 평균속도데이터N _t : Target speed data

: Average speed data

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

Since the conventional fuel injection amount control of the multi-cylinder internal combustion engine is to control the fuel injection amount uniformly, the output of each cylinder is not uniform due to the manufacturing tolerances of the internal combustion engine and / or the fuel injection pump. However, the internal combustion engine stability was remarkably impaired, and the amount of harmful components contained in the exhaust gas increased, causing vibration to the engine.

In order to solve the above-mentioned inconvenience, several small square cylinder control apparatuses 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. A device that allows control of an object is disclosed (see Japanese Patent Application Laid-Open Nos. 58-176424, 58-214627, and 58-214631).

However, since the above-described conventional apparatus is a small learning control method that predicts the next injection amount from the difference between the average engine speed and the speed of each cylinder, it takes time to evaluate the learning result in the microcomputer. The problem is that the responsiveness of the control is bad and furthermore, the complicated algorithm is required to evaluate the learning result, and thus the labor for the development is required.

The object of the present invention is not to require complicated algorithms for evaluating the control results, and to control the idle operation at all times under the operating conditions by the closed loop control according to the output difference between the cylinders of the multi-cylinder internal combustion engine. In addition, the present invention provides an idle driving control device for an internal combustion engine that can suppress vibration of an engine small.

The configuration of the present invention includes a first calculating means for calculating an average speed of a multi-cylinder internal combustion engine, means for outputting target speed data indicating a target child rotational speed required, an operation result of the first calculating means, and the target speed data. 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 closed loop control of the idle rotational speed in response to the first data. An idle operation control apparatus for an internal combustion engine having a closed loop control system provided with control means for controlling a governing means of the engine, comprising: detecting means for sequentially detecting an instantaneous speed at a predetermined timing of each cylinder of the internal combustion engine; For the instantaneous speed for each cylinder and for each cylinder in response to the detection results sequentially output from the detection means. Means for repeatedly calculating and outputting the difference data corresponding to the difference between the instantaneous speeds for each predetermined reference cylinders for all cylinders, timing detecting means for detecting the operation timing of each cylinder of the internal combustion engine, and the difference data Means for calculating and outputting second control data relating to the supply fuel necessary for zeroing the difference indicated by the difference data in response; means for outputting a water temperature signal relating to the cooling water temperature of the internal combustion engine and the timing detection Output control means for outputting the second data at a timing required before the next fuel control stroke for each cylinder according to the detection result by the means; Only supplying the second data from this output control means to the closed loop control system. Is characterized in that it has a means.

According to the above-described configuration, among the feedback control loops in which the average speed of the internal combustion engine is controlled to the desired target idle rotational speed, the feedback control loop for controlling the amount of adjustment for each cylinder is made such that the instantaneous speeds of the respective cylinders of the internal combustion engine are equal. Since it is possible to make each speed fluctuation range of internal combustion engine constant, circuit which can reduce vibration of internal combustion engine, noise level can be lowered and idling rotation speed can be reduced. Therefore, idling operation can be performed stably with low fuel cost.

In operation conditions where the cooling water temperature of the engine is lower than or equal to a predetermined value and combustion of fuel in each cylinder is likely to be unstable, output of the second control data is stopped, and each cylinder control at low temperature is stopped. Stable idle operation control is realized.

In other words, when the cooling water temperature is low, the condition that the combustion of fuel is unstable and the periodic fluctuations of the same tendency appear in each cylinder, which is a prerequisite for each control word, is better to stop the injection volume control in each cylinder. Because.

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 rotation speed of the diesel engine 3 which receives the injection injection of fuel from the fuel injection pump 2.

In the crankshaft 4 of the diesel engine 3, a known rotation sensor 7 derived from the pulser 5 and the electronic pick-up coil 6 is used to detect that the crankshaft 4 reaches a predetermined reference angle position. It is installed. In the illustrated embodiment, the diesel engine 3 is a 4-cycle 4-cylinder, and the cogs 5a and 5c in the cogs 5a to 5d formed at 90 ° intervals on the circumference of the pulser 5 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.

FIG. 2 (a) shows the instantaneous rotation speed N of the diesel engine 3, and FIG. 2 (b) shows the waveform of the AC signal AC obtained from the rotation sensor 7 at this time. AC signal (AC) is gakko each time he faces the electronic pick-up coil (6) to change the portion of his level Jung is a waveform for causing a pair of Jung peak negative viewing angle of zero crossings 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.

회전에 일치하고 있다.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, the time t ₁ , t ₃ , t ₅ ,..., Which are each valley of the instantaneous rotational speed N. t ₁₇ is the explosion timing in each cylinder, and the engine speed (N) increases by the explosion and the time t ₂ , t ₄ ,. At t ₁₆ , the engine speed N begins to decrease, and the engine speed N becomes a minimum value before the explosion stroke of the cylinder which explodes next, respectively. The instantaneous speed of the diesel engine 3 fluctuates periodically for the reasons described above, and its fluctuation period is determined by the crankshaft 4.

I match the rotation.

In addition, although each valley of the instantaneous rotational speed N may be strictly speaking, the piston of each cylinder may not correspond with the time of compression top dead center, but it demonstrates as a convenience here in this specification.

Here, four cylinders of the diesel engine 3 are referred to as cylinders (C ₁ ), (C ₂ ), (C ₃ ), and (C ₄ ), respectively, and these cylinders (C ₁ ) to (C ₄ ) are respectively t. _{In 1} , t ₃ , t ₅ , and t ₇ , the following explanation is given assuming that the cylinder enters the explosion stroke and then each cylinder enters 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 which timing is indicated by each zero crossing point of the AC signal AC. 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 lift 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 which 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 displays the counting result thereof. Binary data is output as 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 via the switch SW controlled to be switched as described later and input to the speed detection unit 8.

Speed detecting section 8 is a time θ _21, θ _21, which requires each tube to explosion crankshaft 4 is rotated 90 ° after the timing of the ... 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 counting pulse CP having a sufficiently higher frequency than the AC signal AC by the AC signal AC. 81) 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 giving a stop pulse for stopping the counting operation of 82 and holding the counting contents 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 ( D ₁ ) is input.

The identification data D ₁ indicates the number of forward pulses generated after the AC signal AC by the counter returned by the positive pulse signal NLP ₁ as the needle valve as described above. The timing detection unit 10 is configured such that the contents of the identification data D ₁ become zero when the needle valve lift pulse signal NLP ₁ is returned. Therefore, the content of the identification data D ₁ becomes t = t ₁ to 1, t ₂ to 2 and t ₃ to 3, as shown in FIG. 2 (d), and thus the positive direction of the AC signal AC. Each time a pulse occurs, it is increased by one, and becomes 0 by the positive pulse signal NLP ₁ , which is a needle valve output immediately before t ₉ after becoming t ₈ to 8, and then the contents are changed to be equal.

The decorator 83 sets the level of the output line 83a to " H " 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 (82). On the other hand, the decorator 84 sets the level of the 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 timing t ₁ , t ₃ , t ₅ . . Thus, each time θ ₁₁ , θ ₂₁ ,... θ ₄₁ , θ ₁₂ ,. The count data CD in response is output from the counter 82.

In the coefficient data CD, data ES related to the engine speed at that time measured by the AC signal AC is input to the conversion circuit 85 inputted from the speed detector 86. The count data CD is obtained by the data ES at each time θ ₁₁ , θ 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 timing of the AC signal indicating the explosion timing of each cylinder to the next zero crossing timing θ ₁₁ , θ ₂₁ ,... Although the data indicating is obtained from the speed detection unit 8, in the present specification, instantaneous speed data indicating the instantaneous rotational speed with respect to the cylinder C ₁ is generally used in accordance with the order detected by the speed detection unit 8. It is assumed that N _in (n = 1, 2, ...).

Therefore, the contents of the instantaneous speed data N _in output from the speed detection unit 8 are as shown in FIG. 2 (e).

Instantaneous speed data N _in 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 every time, and outputs target speed data N _t which displays the calculation result. .

Since the target speed calculator 12 is a well-known configuration for outputting 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, The illustration of the detailed configuration is omitted.

)와 목표속도데이터(N_t)와는 가산부(13)에 있어서 도시의 극성으로 가산되고, 그 가산결과는 오차데이터(D_e)로서 제1PID 연산부(14)에 입력되어, PID 제어를 위한 데이터 처리가 행하여 진다.Average speed data output from the average value calculating unit 11 (

) And the target speed data N _t are added by the adder 13 to the polarity of the illustration, and the addition result is input to the first PID calculation unit 14 as the error data D _e , thereby providing data for PID control. The process 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 분사량조절부재(17)의 그때마다의 위치를 검출하고, 그위치를 표시하는 실제위치신호(S₂)를 출력하고, 실제위치신호(S₂)는 변환부(16)부터의 목표위치신호(S₁)와 가산기(19)에 있어서, 도시의 극성으로 가산된다.The calculation result in the first PID calculation section 14 is taken out as the data Q _ide 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 actually The position signal S ₂ is added to the target position signal S ₁ from the converter 16 and the adder 19 with the polarity shown.

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 and output from the second PID calculation section 20. According to the duty cycle (duty cycle) pulse signal PS is output. The pulse signal PS is applied to the actuator 23 for performing position control of the injection amount adjustment member 17 via the driving circuit 22, whereby the diesel engine 3 is driven by the diesel engine 3 in the injection amount adjustment member 17. The position is controlled to run idle at rotation 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.

Furthermore, the apparatus 1 is further provided with a separate closed loop control system for performing so-called square cylinder control 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. do.

The closed loop control system for control of each cylinder is for adjusting the fuel supplied to each cylinder so that the difference in instantaneous speed of each cylinder becomes zero, and in response to the instantaneous speed data (N _in ) of the cylinders (C ₁ ) to (C ₄ ) The speed difference calculation part 24 which calculates the difference between the instantaneous speed for each and the reference instantaneous speed with respect to the reference cylinder predetermined for each cylinder is provided.

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 accordingly, 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 with reference data D _r having zero as contents and the polarity of the illustration in the adder 25, and the addition result is controlled by the third PID calculator 26 for control. After the necessary processing is carried out, it is output as J-data D ₀ having the dimension of the injection amount.

)는 속도검출부(8)부터 새로운 순시속도데이터(N_in)가 출력될때마다 갱신되고 따라서 그 내용은 제 2(g)도에 표시한 바와같이,

,

,…와 같이 변화하고 있다.In addition, the average speed data of the diesel engine 3 (

) Is updated every time the new instantaneous speed data N _in is output from the speed detecting section 8, and therefore the contents thereof are shown in Fig. 2 (g),

,

,… Is changing.

The output control unit 27 is for controlling the output timing of the control output data D ₀ due to the difference data D _d , and its output timing is controlled in accordance with the identification data D ₁ as follows.

That is, the control output data obtained at any timing (D ₀₎ is a cylinder that corresponds to the difference data that is the basis for its control data (C ₁₎ and (C ₁ +1) of the, for the cylinder (C ₁ +1) It is output for the control of the next fuel adjustment operation, and is added in the idle control amount data Q _ide , which is the output of the first PID calculation unit 14, and in the adder 15.

Thus, for example, the difference data N _d (= N ₁₁ -N ₂₁ ) obtained at time t ₄ indicates the instantaneous speed difference between the cylinder C ₁ and (C ₂ ) and thus the cylinder ( C ₂₎ this is at least in advance of the time t ₁₁ enters the explosion stroke to the next cylinder (C ₁₎ is output at the timing later than the time t ₉ to explode.

)에 상응하는 아이들제어량 데이터(Q_ide)와 가산되는 것으로 된다. 이결과 전회의 속도차(N₁₁-N₂₁)를 영으로 하게 분사량조절부재의 위치제어가 행하여져, 기통(C₁)와 기통(C₂)과의 순시속도를 동등하게 하기 위한 조절량제어가 행하여 진다.Therefore, in this case, the control data D ₀ resulting from the difference data of (N ₁₁ -N ₂₁ ) is the average velocity data (

) Is added to the idle control amount data Q _ide . As a result, the position control of the injection amount adjusting member is performed to make the previous 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. Lose.

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 (C ₁ ) 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 determined for each cylinder. It 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 28 indicates that a predetermined condition that can be stably performed in each cylinder control is satisfied. Only when it is detected by means of the control, the cylinder 29 is closed by closing the switch 29, and when the predetermined condition is not satisfied, the switch 29 is opened, the cylinder control is stopped, and the idle operation is rather unstable by the cylinder control. It is configured to prevent it.

That is, the angular velocity control by the angular cylinder control described above is preferably performed in a stable state in which the idle rotational speed is within a predetermined range with respect to a desired target value. This is because the aforementioned cylinder control works well in the case where the dispersion of the injection system and the internal combustion engine is regularly and regularly shown. Therefore, when the acceleration / deceleration operation is performed or when an error occurs in the control system, the idle operation becomes rather unstable when each cylinder control is performed.

Therefore, in the present embodiment, 1) the difference between the target idle rotational speed and the actual idle rotational 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 less than or equal to the predetermined value a ₂ . The switch 29 is closed only when all the conditions are satisfied, so that a control loop for each cylinder control is constructed.

a₁)이상으로 된것, ⓑ 가속페달의 압입량이 소정치 a₄(

a₂) 이상으로 된것, ⓒ 제어계에 어느이상이 생긴것중의 적어도 하나에 해당하였을 때에는 스위치(29)를 열어서 각 통제어가 중지되어 평균속도데이터에 따라 아이들회전속도가 소요의 목표치로 되도록 분사량조절부재(17)를 제어하기 위한 폐쇄루우프 제어계만이 구성된다.On the other hand, the difference between the target idle speed and the actual idle speed is a predetermined value a ₃ (

a ₁ ) or more, b) the indentation amount of the accelerator pedal a ₄ (

a ₂ ) When it is at least one of the above, ⓒ If any abnormality is occurred in the control system, open the switch 29 and stop each control word so that the idle rotation speed becomes the required value according to the average speed data. Only a closed loop control system for controlling 17 is configured.

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 by the rotational speed of the diesel engine. In this way, the response of the actuator 23 is improved during each cylinder control.

Further, the apparatus 1 further advances the cold / cool water temperature of the engine so that the idle rotation speed control of the engine can be made more stable when the cold / cool water temperature of the engine is about the same as the ambient temperature immediately after starting the engine in a cold place or the like. until at a predetermined value and a square tube off control unit 30 to stop temporarily the angular cylindrical control by the output data (D _0).

T_r인 경우에는 스위치(31)를 온하며 T_w

T_r인 경우에는 스위치(31)를 오프하도록 스위치(31)의 개폐제어를 하는 스위치제어신호(S₄)를 출력하는 스위치 제어회로(33)등으로 형성되어 있다.Each cylinder control release part 30 is a water temperature sensor 32 and a water temperature signal (S _w ) for outputting a water temperature signal (S _w ) indicating the cooling water temperature of the switch 31 and the diesel engine (3) disposed in series with the switch 29 determine whether or not the S _w) in response to cooling water temperature (S _w) is a predetermined value (T _r) to the T _w

In case of T _r , switch 31 is turned on and T _w

In the case of T _r , the switch control circuit 33 or the like outputs a switch control signal S _{4 for} controlling the opening and closing of the switch 31 so as to turn off the switch 31.

As a result, when the cooling water temperature T _w is smaller than the predetermined value T _r , the switch 31 is turned off, and the output data D ₀ is output regardless of the operating state of the switch 29. Supply to the adder 15 is stopped, and each cylinder control is released.

Therefore, the combustion temperature of the fuel in each cylinder becomes unstable due to the low engine temperature. Therefore, the output pattern of each cylinder is changed irregularly, so that the change pattern of the output difference of each cylinder is not constant. If the precondition is not satisfied, the control of each cylinder is released. In this case, not only the idle rotation speed is controlled according to the average speed data of the engine, but also the cylinder control does not operate well in the above-described state, so that the control of the idle rotation speed is more stable. Can be run.

When the coolant temperature of the engine has risen to a value T _{r at} which the combustion state of the fuel in each cylinder can be stably executed, the switch 31 is turned on, and as a result, the angle cylinder control described above is also executed. The idling speed control can be extremely stable, and the diesel engine 3 can be idled in a state of reducing fuel consumption and noise.

In the above embodiment, a case in which the switch 31 for opening and closing according to the cooling water temperature is provided separately from the switch 29 has been described. For example, as can be understood from the above description, for example, the switch control signal from the switch control circuit 33 ( S ₃ ) may be input to the loop control unit 28 and a condition may be set in which the cooling water temperature T _w is equal to or larger than the predetermined value T _r during the opening and closing conditions of the switch 29 described above.

According to the above-described configuration, according to the average speed of the diesel engine and the position of the injection amount adjusting member, the control of the transient changes such as the undershoot and the idle speed by the closed loop control and the idle rotational speed are approximately reached to the target value. The control is executed to thereby control the speed fluctuations of the respective cylinders in accordance with the respective cylinder control while the idle rotational speed is substantially stable.

Even when each cylinder control is being executed, control of the average speed is carried out, the placenta of the output quantity is born, and each cylinder control performs a function of correcting it. When the coolant temperature is lower than the predetermined value, the cylinder cylinder control is released and the cylinder cylinder control is prevented from being unstable by performing the cylinder cylinder control at low temperature. Therefore, the idle operation of the internal combustion engine is stably under all conditions. Can be controlled. Furthermore, as described above, the angle cylinder control can be executed only when the idle rotational speed is near the target value. However, in such a region, the gain of the control of the average children's rotational speed is set small, and it has a great influence on the operation of the angle cylinder control. It cannot be given.

In addition, in the above embodiment, since the cylinder focused on detecting the angular velocity of each cylinder is based on the time between the compression top dead center and the crankshaft by 90 ° rotation, fluctuations in the explosion torque can be detected well. It helps to improve control performance.

4 shows another embodiment of the present invention in which an idle driving control device is realized by using a microcomputer.

The same reference numerals are given to the same parts as those shown in FIG. 11 among the parts of the idle driving control apparatus 40 shown in FIG. 4, and the description thereof is omitted. Reference numeral 41 denotes a waveform shaping circuit, in which a pulse corresponding to the forward pulse of the AC signal AC is output and output as a top dead center pulse TDC.

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). It is input to the microcomputer 43 provided with 42.

In the ROM 42, a control program for performing a function such as idle rotation speed control executed by the apparatus shown in FIG. 1 is stored, and this control program is executed by the microcomputer 43. Therefore, the idle rotation speed control is required.

The control program is also capable of controlling the angle of separation. The microcomputer 43 has a first output signal O ₁ indicating the result of the control calculation of the injection amount and a result of the calculation of the angle of separation. 2 output signals O ₂ are output so that the first and second output signals O ₁ , O ₂ are supplied to the pulse width modulator 21 and the timer 37, respectively.

5 shows a flowchart art of the control program stored in the ROM 42. As shown in FIG. The control program is composed of a main control program formed by a step 120 for executing initialization after the program is started, a step 121 for calculating the target injection amount corresponding to the operation amount of the accelerator pedal, and a step 121 for position control of the injection amount adjusting member 17. In addition to (122), a separate interruption interruption program ( ₁ ) executed in response to the output of the needle valve lift pulse signal NLP ₁ and a separate interruption interruption program executed in response to the output of the top dead center pulse (TDC) ( INT ₂ ). The intervention interrupt program INT ₁ first sets the contents of the soft counter TDCTR to 8 in the step 123, and then terminates the execution by setting the flag TF to "0".

This flag TF is a flag for determining whether to execute the calculation of the injection amount data Q ₁ or to output the calculated injection amount data Q ₁ in the interruption interruption program 2 described later.

The interruption interrupt program INT ₂ is executed in response to the occurrence of the top dead center pulse TDC to decrease the contents of the soft counter TDCTR by 1 (step 125), and determine whether TDCTR = 0 or not (step 125). ) Will be executed.

If TDCTR = 0, it advances to step 127, sets the content of the soft counter TDCTR to (8), and then advances to step 128 to invert the flag TF. If the determination result of the staff 126 is NO, it advances to step 128, and the flag TF is reversed. Then, according to the interval of occurrence of the top dead center pulse (TDC), the data M ₁ , M ₂ ... (Times T ₁₁ , T ₂₁ , T ₁₂ ,... Shown in FIG. 5) are calculated, and the rotational speed of the engine is calculated according to the calculation result (step 129). .

Next, in step 130, it is determined whether the needle valve repro sensor 9 is broken or not. This determination is judged 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.

)와의 차 (

-N_t)의 값이 소정시간이상 연속하여 a₁이상인지 아닌지의 판별을하여 스텝(131)-(133)의 판별결과가 모두 YES인 경우에만 아이들운전을 위한 순간기관속도에 기초한 각통제어연산을 실행하고 (스텝 (134)), 스텝(135)에서, 평균기관속도에 기초한 아이들회전속도가 각통제어연산의 연산결과를 고려하여 실행할 수 있다.If the needle valve lift sensor 9 has not failed, whether the cooling water temperature T _w of the engine is equal to or higher than the predetermined value T _{r in} steps 131 to 133, or the amount of stepping on the accelerator pedal ( Whether or not 0) is less than or equal to the predetermined value a ₂ , the target children rotational speed N _t and the average children rotational speed (

Tea with)

Square tube control operation based on the instantaneous engine speed for the idle run only when all of the determination of the (133) YES - the determination of the value of _t -N) or not continuously over a predetermined time, the step ₁ 131 (Step 134), and in step 135, the idle rotational speed based on the average engine speed can be executed in consideration of the calculation result of each cylinder control operation.

In response to the occurrence of the TDC, the content of the soft counter TDCTR is decreased by 1 (step 125), the flag TF is inverted (step 126), and then the top dead center pulse TDC... Will be calculated.

Next, in step 128, it is determined whether the needle valve lift sensor 9 is broken or not.

T_r인 경우에만 아이들운전을 위한 순간기관속도에 따라 각통제어연산을 실행하게 되어(스텝(130)), 스텝(131)에서 평균기관속도에 기초한 아이들 회전속도가 각통제어연산의 연산결과를 고려하여 하게 된다.This determination is made as a failure NG when the contents of the counter TDCTR are larger than (8) and it is detected that fuel is being injected. If the needle valve lift sensor 9 has not failed, it advances to step 129 to determine whether or not the cooling water temperature T _w of the engine is equal to or greater than the predetermined value T _r , and T _w.

Only in case of T _r , each cylinder control operation is executed according to the instantaneous engine speed for idle operation (step 130), and in step 131, the idle rotational speed based on the average engine speed is taken into account the calculation result of each cylinder control operation. Will be done.

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

Moreover, when the cooling water temperature is low, since the combustion is unstable, the explosion does not show the same tendency, so the output torque becomes unstable and guarantees periodic fluctuations in the same tendency of combustion occurring in each cylinder which is the premise of each cylinder control. Can not.

T_r인 경우엔 각통제어를 허용하는구성으로 되어 있다. 니이들밸브리프트센서(9)가 고장나 있을 경우에는, 스텝(136)에서 각통제어를 할것인지 아닌지를 나타낸 플래그(FATC)가 「1」인지 아닌지의 판별을 실행하여 FATC=「1」이면 스텝(131)에 전진하고, FATC=「0」이면, 스텝(137)에 전진한다. 스텝(137)에서는 아이들운전상태가 소정시간(T₀) 이상 계속되어 있는지 아닌지의 판별을 하게 되고, 그 판별결과가 NO인 경우에는 스텝(135)에 전진하며, 그 판별결과가 YES인 경우에는 스텝(138)에 전진한다.In this way the state of the cooling water temperature will conceivable as a factor to determine the prerequisite in the case of a square tube control, and thus T _w

In case of T _r , each cylinder control is allowed. If the needle valve lift sensor 9 has failed, it is determined in step 136 whether the flag FATC indicating whether or not the cylinder control is to be performed is "1", and if FATC = "1", the step is performed. It advances to 131, and if FATC = "0", it advances to step 137. FIG. In step 137, it is determined whether or not the idle driving state has been continued for a predetermined time (T ₀ ) or more. If the determination result is NO, the process advances to step 135, and when the determination result is YES, Advance to step 138.

Step 138. In another current interrupt program from neighboring data showing the time interval of the top dead center pulse (TDC) of the data obtained in the execution of the (INT ₂₎ (M _n) and interrupt the first rotation program (INT ₂₎ The comparison with the data (N _n-1 ) obtained at the time of execution is performed.

As can be easily estimated from the second (a) and second (b), 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 data M _n and (N _By comparing _n-1 ), it is possible to determine which state the operation timing of each cylinder is in.

If M _n <N _n-1 , the timing at which the cylinder corresponding to the top dead center pulse (TDC) which caused the interruption interruption program (INT ₂ ) to reach the middle of the explosion stroke (t _{2 in} FIG. 2). , timing corresponding to t ₄ , t ₆ ,... On the other hand, if M _n > N _n-1 , the timing at which the cylinder piston reaches top dead center immediately before any cylinder enters the explosion stroke (the timing corresponding to t ₁ , t ₃ , t ₅ ,... In FIG. 2). ) Pulses.

Therefore, when the determination result of step 138 is NO, each cylinder control operation is not performed, but it advances to step 135, and it is discriminated whether or not the flag FN is "1". The flag FN is provided to discriminate whether or not the determination result of step 137 is YES even once. If (FN) is "0", the determination result of step 139 becomes NO. In step 140, FN = &quot; 1 &quot; and the content of variable N becomes the content of the counter TDCTR and advances to step 135. FIG. Therefore, the determination result of step 139 becomes YES from next time, and it advances to step 141. FIG. In step 141, K = K + 1, and 0 is made in step 142 to determine whether or not K = 4.

K is increased by 1 each time a cylinder is exploded. If the determination result of step 142 is NO, it advances to step 135. If the determination result of step 142 is YES, it advances to step 144, and it is judged whether the value of the variable N matches the value of the counter (TDCTR), and it has passed about 1 cycle (crankshaft 728 revolutions). In the case of N = TDCTR, it advances to step 145, makes FATC = '1', makes TDCTR = 8 TF = '0', and then advances to step 135. If the determination result of step 144 is NO, it advances to step 143, and advances to step 135 with K = "0" and FN = "0".

In this way, when it is determined that the needle valve lift sensor 9 is not a malfunction, it advances immediately to step 131. However, when the needle valve lift sensor 9 is broken, the magnitude of the data M _n and M _{n-1 is} small. As a result of the comparison, the operation timing of each cylinder of the engine is discriminated at that time, and the step 134 of each cylinder control operation is executed in accordance with this discrimination result.

Next, the angle control operation shown in step 134 will be described with reference to the detailed flowchart art in FIG.

First, when the flag TF is determined in step 150 and the high flag TF is &quot; 0 &quot;, the step for calculating the control data for each barrel control is executed later, while the flag TF Is &quot; 1 &quot;, the step for outputting control data for each cylinder control is executed later.

The case where the flag TF is "0" means that the top dead center pulse TDC has not yet been output since the needle valve lift pulse signal NLP ₁ is output or the needle valve lift pulse signal NLP _1. After outputting), an even number of top dead center pulses (TDC) are output, and the next top dead center pulse (TDC) is not yet output.

That is, it is a period in which none of the cylinders are 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, the case where the flag TF is "1" means a period in which one cylinder is in an explosive stroke, as seen from the above description, 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 &quot; 0 &quot;, it is determined in step 151 whether the operating condition of the engine at that time satisfies the requirement for executing each cylinder control, and when the determination result is NO, each cylinder control The content of the data indicating the fuel fraction control amount to each cylinder is set to 0 (step 152).

In the present specification, the injection amount control data for each cylinder control is generally denoted as Q _AIN .

Here, i denotes a cylinder number, and n denotes the calculated timing of this data. In step 163, the integral control data I _ATC for the integral control is stored in the calculation result for the PID control. This PID control is executed in step 159 described later, and the integral control data obtained in step 159 is stored in the RAM 44 of the microcomputer 43 immediately before each cylinder control is turned off.

Then, in step 159, calculation of the injection amount control data Q ₁ for idle rotation control based on the average speed is performed. In step 154, the next cylinder computed one cycle before this control data Q ₁ . and a control for the data (Q ₁₎ was added to the injection amount control data _{Q a (i + 1) (} n-1). This control data Q ₁ is stored in the RAM 44 of the microcomputer 43.

N_in을 연산하고, 이어서 스텝(156)에 있어서, 스텝(156)에서 얻은 차분 (

N_in)과 나아가서 1사이클전에 있어서 마찬가지로 하여 얻은 차분 (N_in(n-1))과의 차분(N_in)을 연산한다. 그런다음, 스텝(157)에서 PID제어를 위한 각정수가 세트되어 적분항(I_ATC1)의 로오드가 행하여 진다(스텝 158).If the determination result of the step (151) YES, the speed on the basis of step 155, the current time output a top dead center pulse (TDC) speed (N _in) and the one a front output a top dead center pulse (TDC) based on the N ( i-1) difference with _n

N _in is calculated, and in step 156, the difference obtained in step 156 (

N _in ) and the difference (N _in ) between the difference (N _in (n-1)) obtained in the same cycle one cycle before are calculated. Then, in step 157, each constant for PID control is set and the _{load of the} integral term I _ATC1 is performed (step 158).

By this, PID control operation is performed (step 159), and the control data Q _{AIN for each} cylinder control obtained as a result 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 become the initial 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 according to the amount of stepping on the accelerator pedal, and the data Q _PRV is defined as ( Step 161), this is output as injection quantity control data to the cylinder in a suction stroke at that time (step 162).

As can be seen from the above description, when the needle valve lift sensor 9 is normal, the needle valve lift sensor 9 is controlled by controlling the operation and output of the control data for each cylinder control by the flag TF. Is broken, the execution timing of each cylinder control is discriminated according to the comparison of the data M _n and M _n-1 , and accordingly, each cylinder is irrelevant whether or not the needle valve lift sensor 9 is broken. You can control it.

According to the present invention, the angular velocity fluctuation range of each cylinder is controlled so that the vibration of the engine can be reduced, the noise level can be lowered, and the idling rotation speed can be lowered. Operation processing is easy and configuration is simplified.

In addition, by canceling each cylinder control in response to the cooling water temperature of the engine, and performing the cylinder control at low temperatures, it is possible to improve that the stability of the control is impaired, and the idling operation control can be stably performed over a wide range. have.

Claims (1)

A first calculating means for calculating an average speed of the multi-cylinder internal combustion engine and a means for outputting target speed data indicating a target child rotational speed required, and target children in response to the calculation result and the target speed data of the first calculating means. Controlling means for outputting first control data relating to the amount of fuel to be supplied to the internal combustion engine to obtain the rotational speed, and required speeding means for closing loop control of the idle rotational speed in response to the first control data. An idle operation control apparatus for an internal combustion engine having a closed loop control system, comprising: detecting means for sequentially detecting an instantaneous speed at a predetermined timing of each cylinder of the internal combustion engine, and sequentially outputting from the detecting means. In response to the detection result, the instantaneous speed for each cylinder and the predetermined criteria for each cylinder Means for repeatedly calculating and outputting the difference data corresponding to the difference with the instantaneous speed for the cylinder for all cylinders, timing detecting means for detecting operation timing of each cylinder of the internal combustion engine, and the difference data in response to the difference data. Means for calculating and outputting the second control data relating to the feed fuel necessary for zeroing the difference indicated by the above, means for outputting a water temperature signal relating to the cooling water temperature of the internal combustion engine, and detection results by the timing detecting means. Output control means for outputting the second data at a timing before the next fuel control stroke for each cylinder and the cooling water temperature from the output control means only when the coolant temperature becomes higher than a predetermined value in response to the water temperature signal. Means for supplying data to said closed loop control system; Institutional idling control device.

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