JPS5932648A - Apparatus for controlling engine speed - Google Patents

Abstract

PURPOSE:To improve startability of an engine, by making the amount of by-pass air for controlling the idling speed small at the time of starting the engine when the temperature is low, and increasing the amount of by-pass air gradually after complete explosion is obtained. CONSTITUTION:Since an idle control valve 6 is kept at a relatively closed position and pressure in an intake pipe 2 is lowered promptly at the time of starting an internal combustion engine 1, the velocity of air flow through a throttle valve 21 is high and fuel supplied from an electromagnetic injection valve 3 reaches the engine 1 promptly, so that startability of the engine is improved. Further, since the amount of by-pass air is increased gradually after complete explosion is obtained,it is prevented that mixture supplied to the engine 1 becomes lean abruptly, so that the engine speed is not dropped after starting of the engine. Further, since feedback control of the engine speed is started after passing of a prescribed time from the time when complete explosion is obtained, the engine speed is controlled in the region where the engine speed is stabilized, so that excessive control of the engine speed is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational speed control device for controlling the idle rotational speed of an internal combustion engine to a predetermined value when controlling the fuel consumption of an electric V-type internal combustion engine.

In devices that electrically control the fuel stitch of an internal combustion engine, the intake air stitch of the engine is usually set to the Δ1 side, or the intake air stitch is set to 'iH1 based on the engine's intake pipe pressure and rotational speed, and the intake air stitch is A predetermined amount of twisted wiping is supplied to the IJ (in order to control the idle speed, the intake pipe is installed in the middle of the intake pipe of the engine).One method is to use a bypass pulp to control the air that is completely bypassed. It will be done.

What is the method of controlling the bypass pulp 1 and L2?

A vacuum motor that uses the intake pipe pressure of an internal combustion engine is used, and the pressure of the vacuum motor is controlled by a solenoid.
It is conceivable to control the position of the bypass pulp.

Using this bypass pulp, from the time of starting the internal combustion engine.
When trying to control the bypass air described in 2 above, it is necessary to supply the bypass nitrogen gas necessary to maintain the idle speed of the internal combustion engine when it is cold from the beginning.
By quickly lowering the intake pipe pressure of the internal combustion engine and then gradually bringing it closer to the amount of bypass air necessary to maintain the idle speed, the amount of bypass air can be reduced by 2 liters when starting the internal combustion engine. It is thought that it is possible to quickly send I'IL air into the cylinder of an internal combustion engine by turning the FI'E force of the intake pipe to the vacuum side quickly and increasing the flow rate of intake air, which results in significantly better startability. It was discovered experimentally.

Therefore, the present invention reduces the amount of bypass air that controls the idle rotation speed by CF at the time of cold start of the internal combustion engine.
7. It is an object of the present invention to provide a rotational speed control device that can improve startability all the time by increasing the number of complete detonations.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the rotation speed control device of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, an internal combustion engine 1 is a known four-stroke spark ignition internal combustion engine mounted on an automobile, and intakes combustion air through an air cleaner 22% intake pipe 2 and a throttle valve 21.

In addition, fuel is supplied from a fuel system (not shown) via an electromagnetic injection valve 3 provided upstream of a throttle valve 21 provided in the intake pipe 2. pressure sensor 4 for detecting the pressure of
is connected.

The pressure sensor 4e, for example, a known semiconductor pressure sensor, converts the absolute pressure of the intake pipe 2 into an output.

The water temperature sensor 5 detects the temperature of the cooling water of the internal combustion engine 1, and the resistance decreases as the temperature increases! It's like Koumista.

The ignition coil 7 supplies high voltage (Z) to spark plugs (not shown) provided in each cylinder of the internal combustion engine 1.

The idle switch 23 is turned on when the throttle valve is fully closed, and turned off otherwise.
It is built into the speedometer (not shown) and corresponds to 5 per hour.
It is turned on only under the following conditions. Idol system? Bypass the M19F6 throttle valve 21 and install the throttle valve 21
1. This idle control valve 6 is for controlling the bypass air supplied to the downstream of the It is composed of a negative pressure chamber 64 equipped with a spring 67 that applies pressure, and the diaphragm 6
By changing the amount of lift of the valve 66 by 5, the amount of bypass air is controlled. The pulp 66 is connected to the position sensor 61, and the resistance value of the position sensor 61 changes depending on the position of the pulp 66.

This negative pressure chamber 64 communicates with the throttle valve downstream of the intake pipe 2 via the VAC solenoid 63, and
It is connected to the atmosphere via a VENT solenoid 62.

Therefore, VAC solenoid 63, VENT)
By opening and closing the v-noid 62, the negative 1 of the negative pressure chamber 64,
The lift amount of the pulp 66 is controlled by changing fE.

When the VENT solenoid 62 is closed and the VAC solenoid 63 is opened, the output of the negative pressure chamber 64 gradually approaches the output downstream of the throttle valve 21 of the intake pipe 2, and the valve 66 moves in the direction of increasing bypass air. VE
When the NT solenoid 62 is opened and the VAC solenoid 63 is closed, the pressure in the JlE chamber 64 gradually approaches atmospheric pressure, and the pulp 66 moves in a direction that reduces the bypass air.

When the starting switch 101''L is turned on, power is supplied from the battery 12 to the starter coil 11 to start the internal combustion engine 1.

On the other hand, the control device 8 includes an IE hinge height 4, a water temperature sensor 5.
Position sensor 61. Signal start switch 10 of ignition coil 7
etc., and controls the electromagnetic injection valve 3°VENT solenoid 62, VAC solenoid 63, etc.

FIG. 2 is a block diagram showing the detailed structure of the control device 8. As shown in FIG. The control device 8 is a ROM that stores a control program.
97 and a built-in AM98 for temporarily storing data.

The low-pass filter 81 smoothes the output of the pressure sensor 4,
Output of filter 82 and position sensor 61? (J1 pressure noise is removed, the interface 83 converts the resistance change of the water temperature sensor 5 into a pressure change, and - the above low-pass filter 8
1. Filter 82. The output of interface 8:3 is connected to multiplexer 99.

Marv precoo! One of the three signals inputted to the multiplexer 99 is selected from the output signal of the J99i microcomputer 8° and outputted from the A I) converter 84 (↓).This At) converter 84 shijl
, convert the input city and river into digital values (hereinafter referred to as A
All digital numerical values are output to the Schiff microcomputer 80 (referred to as D conversion).

The AD 11684 starts the entire AL) conversion operation by outputting +'3 from the microcomputer 80, and completes the AD conversion operation after a certain period of time.

Further, the comparator 85 converts the ul and pressure of the primary coil of the ignition coil 70 into a logic level signal, and outputs it to a clock terminal of a D-type Frisop flag 86 (hereinafter referred to as FF'). The output of F F 86 is set to 1-LJ in synchronization with the ignition coil 7 generating high pressure, and is determined by the output signal of the microcomputer 80.

This output signal is connected to the gate screw of counter 87 and the first interrupt terminal of microcomputer 80. The clock terminal li of the counter 87 is connected to the output of the oscillator 88, so that the output signal of the microcomputer 87 counts the output of the oscillator 88 during the period of January.

When the first interrupt nA becomes rLJ, the microcomputer 8 () reads the count value of the counter 87, clears the counter 87, then centers the FF 86, and sets its output to r'I(J). It has become.

Therefore, the count value of the counter 87 is a numerical value corresponding to the ignition cycle of the internal combustion engine 1.

The timer 79 controls the microcomputer 8 every 5m5ec.
An interrupt signal is output to the second interrupt terminal of 0.

The digital interface 89 is the idle switch 2
3, the on/off signal of the vehicle speed switch 9, and the signal of the start switch 10 are converted into logic level signals and output to the microcomputer 80.

The timers 90, 91, and 92 each receive the output signal of the oscillator 93 and start counting down the numerical value set by the microcomputer 80 by trigger signal Q from the microcomputer 80. A signal of 1'HJ is output from the time when is input until the count value becomes zero.

Drivers 94, 95, and 96 each have timers 90, 91,
92 output. The driver 94 is an electromagnetic type 1
1, which drives this rL magnetic injection valve 3 while the timer 9o's output is [January Hf].
The valve 95 i,,i, is connected to the VAC renoid 63, and drives the VAC renoid 63 during the period when the output of the timer 9J is l'HJ, thereby communicating the negative pressure chamber 64 and the intake pipe 2.
The driver 96 is connected to the VfICNT solenoid 62, and the output of the timer 92 drives the VENT solenoid 62 for a period of one month, thereby communicating the negative pressure chamber 64 with the atmosphere.

When the microcomputer 80 receives an interrupt signal from the timer 79 every υ5 m sec to the second interrupt terminal, the multiplexer 99 outputs the low-pass filter 81 .
Filter 82, interface 8: output signal of 11
The pressure sensor 4. is first selected by the AI) transducer 84.
Position sensor 61. Water temperature sensor! AD the data of j! In addition, the microcomputer 80 (']:, ''-4 outputs an interrupt E signal to the first interrupt terminal (Ignition code rLJ generates an IE signal). occurs when ) is input, the counter 87 counts 1st shift'fr: reading 11, and the microcomputer 8
Wc: 1', 5 Clears counter 87 to zero, F) "86 to 10.

Set the output of FF86 to "11".

Next, the data in register A? As r-T, first R
The rotation aNt is stored in the RAM 98 by calculation of K/T using the numerical value statically determined in the OM 97.

Next, pressure sensor 4. Electromagnetic injection 9T from the above rotation number N
Calculate the drive time to -3, (-7, reset the numerical value to the timer 90, and input the timer 90Kl trigger signal.
In synchronization with the ignition, the pressure sensor 4. It is driven for a time determined by the rotational speed N.

Next, the idling speed control of the microcomputer 80 will be described. Microcombi, R of 1-ta8()
The idle speed of the internal combustion engine 1 shown in FIG. 3 is stored in the OM97 using the water temperature of the internal combustion engine 1 as a parameter.

As shown in Fig. 3, the output of the position sensor 61 is controlled by the idle rotation speed (QtFi-?P, and +'t = water temperature of the internal combustion engine 1 as shown in Fig. 4). is stored in the ROM 97 as a parameter.

FIG. 5H is a flowchart for controlling the number of idle rotations of the microcomputer 80. The processing in Figure 5 is
2. This is performed every time the timer 79 inputs the υ interrupt signal to the second interrupt terminal every 5 m5 ec.

When the above interrupt signal is input, in step 100, the pressure sensor 4, the position sensor 61 . AD information of water temperature sensor 5
Convert and store in RAM98. The results of AD conversion of the pressure sensor 41, position sensor 61%, and water temperature sensor 5 at this time are assumed to be PBAD, PAT), and WAD. ) If the starting switch 10 is turned on at step 101, go to step 102; if it is off, go to step 1.
The process moves to 03. In step 102, the total number of revolutions is set to 14], and if it is less than 4 (') Orptn, then step 1
If the engine speed is 400 rpm or more, that is, the engine is completely detonated, the process moves to step 103.

In step 108, the valve 66 is
Set 1) 1 to the starting target position PS, and set the starting target position PA to the above target position It i) S. After the complete explosion, set the timer C8 to 25.

Step 1 () 9: 50m5ecf; Y passed or all judgments are made. If 7.50y+5sec has passed, step 116
Go to step 5 If not, go to step 124 4, trench 5
The process moves to step 116 every 0 m5ec. 50m
For the 1'(') constant of 5ec, data that counts down every 5m5ec is provided in the RAM 98, and it is determined that it is 50m5ec depending on whether or not this data reaches zero, and a value of 10 is preset each time it reaches zero.

Step 103 determines whether 200ynsec has passed or not, and if the time has passed, step 1() is performed.
Go to 4.

Otherwise, the process moves to step 110. Step 10:
Mouth 111. 5 m5ec 45 provided in RAM98
& to determine the data to be counted down, and if this data is zero, it is determined that 200 msec has elapsed, and this data is preset to 40. Therefore, the processing from step 104 onward is performed every 200 m5ec.

At step 104, the post-explosion timer 'C provided in RAM 9B counts down every 200m5ec, and if it is zero, it goes to step 105, otherwise it goes to step 105.
, move to step 110-\.

In other words, after the start switch 101 is turned on and the rotational speed reaches 400 rpm or more, the engine is turned off every 5 seconds.
From J1 line 17A L, the processing from step 105 onwards is performed.

In step 105, the state of the idle switch 23 -t[f
If the throttle valve 21 is fully closed (f1L, , =4), then the process moves to step 106; otherwise, the process moves to step IJO. In step 106, the state of the vehicle speed switch 9 is judged, and if it is on and below 5km/h, the process goes to step 107; otherwise, step 11
Processing moves to 0.

Therefore, step 107 is 200m5ecfQ.

The throttle valve 21 is in the fully closed position and the speed is 5%.
/h or less is processed when the vehicle is almost at a standstill.

In step 107, the target rotation speed No. determined from the water temperatures WA and D as shown in FIG.
Hyo') PH+ (No -Nt)-'s first performance,
and use this as new valve position correction data.

Therefore, if the idle rotation speed of the internal combustion engine 1 is lower than the target rotation speed No. determined from the handwritten water temperature WAD, the value of the pulp position compensation l-data PH gradually increases,
In the opposite case, τ gradually decreases.

In step 110, as in step 109, 50m5
Judgment of ec? 7, 50 m5ec awakening Y iM
1. , - otherwise the process of step 111, - otherwise the process of step 124 f: Y'j. 1-7
Therefore, h is processed every 50m5ec of processing money after step 111.

In step 111, after starting the bow 5, determine whether the target 1g device PA has reached the maximum level or not (2), and if it has reached the maximum, proceed to step 113; otherwise, proceed to step 112.

In step 112, after the start, the data and evening S are placed in the position PA.
Add. Therefore, after starting the eye position PAL or 50
tn sec'lD-.

Step 113i, from the above water temperature WAD, as shown in Fig. 4 ('The estimated position Po of the valve 66 and the above valve position correction data PI are added (po + PH)
and the starting barley mark position PA, and if PA is large, the process moves to step 114; otherwise, the process moves to step 115.

In step 114, the above (Pa+P
H), and in step 115, the target is also set to the landmark position PA after starting the device P1. Therefore, step 113
, 114.115, the smaller of PA(!:PO+PH is set to Pl.

At Sudetsubu 116, "Second delta self (vote' place hammer: P 1:
1 and 2H self f ~ device sensor 1J61 position P A D
Then, the deviation PT+PAD is calculated and set as PT2. Therefore, PT2 is the target temperature r at water temperature WAD.
This is the deviation between the device PTI and the position of valve 66.

In step 117, if the deviation PT2 stops or the 1 mark position PTI is larger than the position of the valve 66, go to step 118; if not, go to step 121.
Processing moves to step 1. In step 118, the above deviation PT2 is multiplied by a constant K
A numerical value TA corresponding to the driving time of the VAC solenoid 63 is calculated. In step 120, the above numerical value TA is set to the timer 91.
Set to .

In step 120, the timer 91 is triggered to drive the VAC lenoid 63 for a time corresponding to the numerical value TA.

In steps 121 to 123, the deviation PT2 is
VENT soI/noid is fully driven for a time equal to the absolute value of KE multiplied by KE. At step 124, the interrupt processing for 5m5ec is completed.

FIG. 6 shows the target position PT obtained by the process shown in FIG. shows the trajectory of Figure 6 (alk, the shape of the starting switch 1o,
6th engine 1 (b) engine 4-intake 'Itsu 2's absolute utility, Figure 6 tcl is the Qilt trace of the eye (1-a) device P T 1, Figure 6 ((11 is the rotation of the internal combustion engine 1) Show the number.

In FIG. 6, 1 time 1. Assuming that the starting switch 1o is turned on at time L2, the internal combustion engine 1 is started, and the starting switch 10 is turned off at time L2. ~t2, the target position I)TI becomes the predetermined starting position fsI, and from time t2~
It gradually becomes larger at L3.

Target position P 'J,' 1 is water temperature WAD after time t3
From time t4, which is 5 seconds after the start switch 1° is turned off, the throttle valve 21 is fully closed when the heavy speed of the vehicle is 5 Kn/h or more. If so, the rotation speed of the internal combustion engine 1 is set to the target rotation speed No. by the process of step 107 in FIG.
The valve position correction data PH is modified so that they match at f, and the valve 66 is thereby controlled, so that the rotational speed of the internal combustion engine 1 is the target rotational speed N.

The bypass air is feedback-controlled to -1nk.

In this embodiment, complete explosion was determined based on the rotational speed, but it may also be determined based on the pressure in the intake pipe 2.

As described above, according to the rotation speed control device of the present invention, when starting the internal combustion engine, the valve is kept relatively closed and the pressure in the intake pipe is quickly lowered. The flow rate is fast, and the fuel supplied from the electromagnetic firing chamber 3 reaches the internal combustion engine quickly, improving starting performance.At the same time, bypass air is increased at each complete explosion valve, so the air-fuel mixture supplied to the internal combustion engine is It won't suddenly become thinner, and there will be no drop in rotational speed after starting.

Furthermore, by feeding back the rotational speed of the internal combustion engine after a predetermined period of time has elapsed after the complete explosion, control can be performed at a point where the rotational speed is stable, and excessive control can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the rotation speed control device of the present invention, FIG. 2 is a block diagram showing the detailed configuration of a control device that is similar to the rotation speed control device of FIG. 1, and FIG. is a diagram showing the l-sided nature of the water temperature and rotation speed in the rotation speed control device shown in FIG. 1, and FIG. . Fig. 6 1al to 6 (dl are diagrams showing the locus of the target position @PT1 by the processing of Fig. 5, respectively. 1. Internal combustion engine, 2. Intake positive, 3. Type injection box. 4... Pressure sensor, 5... Water temperature sensor, 6... Idle control valve, 7... Ignition coil, 8... Control device, 9
...Vehicle speed switch, 10...Start switch, 21...
Throttle valve, 23... Idle switch, 61...
・Position sensor, 62...VENT solenoid, 63...
VAC Renoid, 80...Microcomputer, 8
1...Low pass filter, 82...Filter, 83
．． 89...Interface, 85...Comparator, 8
6...D flip-flop, 87...Counter, 84
... AD converter, 88.93 ... Oscillator, 79.9
0-92...Timer, 94-96...Driver, 97
-ROM. 98...RAM0

Claims (1)

[Claims] 1114 A throttle valve provided in the middle of the trachea of an internal combustion engine, a bypass pulp for controlling air that bypasses the throttle valve, -1- means for detecting an idle state of the internal combustion engine, and a means for detecting the idle state of the internal combustion engine. At times, the target (iZ F(
] 2d [11 stages to control the bypass valve, 11 stages to control the bypass valve, 2 to match the target rotation speed of the internal combustion engine, and 7 to correspond to the I-1 cooling water temperature. Means for correcting according to the deviation of 2. When starting the internal combustion engine in a cold state, the air flow through the mini-bypass valve is corrected by the upper 6 [: smaller than the self-hardening position] 7, after starting this? ″P
4. means for controlling the air circulation company so that it gradually approaches the -1- target position; A rotational speed control device that is characterized by a 'ifi' function.