JPS5932640A - Apparatus for controlling engine capable of rendering part of cylinders inoperative or at rest - Google Patents

Abstract

PURPOSE:To prevent air-fuel mixture from becoming too rich in an engine capable of switching the mode of operation from ''full-cylinder operation'' to ''partial- cylinder operation'' by controlling the number of cylinders in operation, by providing a timer circuit for producing a signal for a prescribed while from the time when switching from ''full-cylinder operation'' to ''partial-cylinder operation'' is effected in a ''full-cylinder operation'' maintaining section. CONSTITUTION:Timer circuits 8, 11 start measurement of time at the rising time of signals applied to them. In switching the mode of operation of an engine from two-cylinder operation to four-cylinder operation, the level of a signal S1 is changed from high (partial-cylinder operation) to low (full-cylinder operation), and resultantly, the level of an output signal S2 of an OR-circuit 4 is rendered ''low''. By the ''low level'' of the signal S2 and the ''high level'' or ''low level'' of a signal S6 produced from a ''full-cylinder operation'' maintaining timer circuit 8 via a NOT-circuit 10, the level of a valve stopping signal produced from an AND-circuit 5 is rendered ''low''. Resultantly, an operation signal is given to a valve stopping means 6, so that switching from ''partial-cylinder operation'' to ''full-cylinder operation'' is effected at an appropriate timing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a system for controlling the number of active cylinders to perform full air extraction operation (all cylinder operation) and partial cylinder J rotation (deactivated cylinder rotation). Regarding the idle engine, L2! [! A device for controlling the switching from the all-cylinder operation state to the cylinder-stop operation state in I and A is used.

Conventional cylinder engines have been designed to improve fuel efficiency by increasing the combustion efficiency and preventing the generation of harmful scum, increasing the load factor and reducing pumping loss. ζri 1
In this case, for example, K-IJ: During low negative Ef operation, it is necessary to operate the engine by resting the power of the engine in L7 state.

By the way, for example Iz. l: 49cm in a 4-cylinder engine, from 2-cylinder operation (body cylinder operation) not shown in Figure 1 to 4-cylinder operation (all-cylinder operation) shown in Figure 2, and then from 4-cylinder operation to Figure 5. Switching to two-cylinder operation (shu-zheng operation) as shown. As a state in which . For example, when the eye is 1'', repeat v-'y:y' at intervals of about 1 second. Considering the current situation, the force {the amount of fuel supplied from the 1-speed bomb to the intake 1 manifold 21 increases, so one box of wood rotates one mile? At this time, the fuel b accumulated in the intake manifold a is taken into the active cylinder C during the cylinder deactivation operation, resulting in a situation of Z=rich.

This overrich condition occurs when all the fuel sent from the acceleration bomb is not consumed and remains in the intake manifold a.For example, on the working cylinder side, the wall surface temperature decreases due to the heat of combustion and vaporization. , intake manifold a
If the inner wall becomes wet, and especially when all cylinders are running, this wet state will not be eliminated and when the engine shifts to full-scale operation, it will become s-rich. It will become.

Then, the racing as described in -1- was repeated {51 times?
There is a problem with Elegin stopping.

・Main departure! d: Trying to solve problems like this0
To provide a control device for a cylinder-deactivated engine that can prevent fuel supply from becoming overrich due to 6Df/all-cylinder rotation state maintained for a predetermined period of time.

This is no use, the present invention is closed. The cylindrical engine control device controls the number of active cylinders in a deactivated engine that can operate all cylinders or some cylinders, in order to control the switching of some of the cylinders between the active state and the deactivated state. It is equipped with a cylinder deactivation determination unit that can send an activation signal or cylinder deactivation signal to the cylinder deactivation means, and is in an operational state. In order to maintain the operation, send an operation maintenance signal to the above body cylinder means? an operation maintenance section capable of transmitting an operation maintenance signal, and the operation maintenance section transmits the operation maintenance signal for a predetermined period of time from the time when some of the cylinders are switched from a cylinder deactivation state to an operating state. It is characterized by having a timer circuit.

Hereinafter, a deactivated engine control system as an embodiment of the present invention will be explained with reference to the drawings. Fig. 4 is a block diagram showing its overall configuration, Fig. 5 is its electric circuit diagram, and Fig. 6 (
All of a) to (1) are graphs showing the effect.

Now, what about the engine for this device? For example, a engine has four cylinders, and controls the number of active cylinders from 4 to 2 or from 2 to 4, so that all four cylinders are in the active state (all-cylinder operation)'=! is? leaves two cylinders inactive and leaves the remaining two cylinders inactive.
? - Partial cylinder operation (1) in which only the cylinders are in operation
It is configured as a cylinder-deactivated engine that can perform cylinder-deactivated operation.

In order to control such a cylinder deactivation engine, as shown in FIGS. 4 and 5, a cylinder deactivation determination circuit IFg+l (deactivation determination section) 1 is provided, and this deactivation determination circuit 1 is connected to a load sensor 2 and a deactivation determination circuit 1. In response to signals representing the operating state such as an engine load signal and a water temperature signal from the water temperature sensor, an activation signal or a suspension signal is transmitted to a valve stop device 6 serving as a cylinder shutting means.

Then, the valve stop device 6 controls some cylinders (hereinafter referred to as;
It's called a "control cylinder." → is deactivated and activated at appropriate timing.

In order to maintain the operating state of the controlled cylinder with priority even if the cylinder deactivation signal (S1 is not activated) is issued from the activated controlled cylinder \ cylinder deactivation determination circuit 1. , operation maintenance signal to valve stop equipment 6 (86 is low level)
The operation maintaining section 15 is provided with an operation maintaining section 15 capable of transmitting an operation maintaining signal for a predetermined period of time from the time when the controlled cylinder is changed from the deactivated state to the operating state. A wholesale timer circuit 8 is provided.

Furthermore, even if an activation signal (81 is low level) is issued from the cylinder deactivation determination unit 1 to a controlled cylinder in a deactivated state, the control cylinder is given priority over this signal to maintain the deactivated state of the controlled cylinder. Then, connect the cylinder stop cord 1 to the valve stop device 6, 'ff change' (S9...
1 bet) 4 shots, 1 long rest 'i time {t1,
14-r/r・setb[)JLeG,↓・・ri、ko(b
Body 1'κ) Thread 1 {Mochi) '91-14 has illllji
ll'＜',h')"Sakuichi1+ikηi,!-:441
) 1 piece 1 zu) shaped grass ＼ 11, ] jetgu 11,: ↑,
B)・I゛, 191′,,H)u:, between &-J rest 1 night M(;4-Il i1-1 issue {q-1-ruf{, ii
:)) (If'I,~Ill imma circuit 11 is set up, operation)・144"+'"rslI15
(・(▽ is t1 bowworm (Enzon rotation speed T<”!'-
C1,) 4・ff'll Sizing from medium speed judgment circuit 9 to operating light {1h jinshi'i(j) Increase/decrease the interval between mouths Mτ11 wa 1
-4゛Rusuke {Yumiyama or supply 4} I) Yo(・(1k・tsu-rl, this Chuko publication circuit 9(・:l, Nakagami(」・
Detect the number of revolutions of the engine (・).
Nakasaka Haku-No. 1i5. If the first grade is 1- (1st year of high school)
! 1!8-'("'..i'it temple)
At Riki (during low-speed walking), the same {Bayumi) 6-Lo level and-
] Ichiru (-, toro de, body 1)) UJ1 body i%iff in the holding part 14
'll Receives the signal ``r3'' from the constant circuit 1 or the operating number! ``I rested my bow 373;
'i#{f is received at the input end of the holding timer circuit 11 71, and this rest correction {the output I of the Mochikawa timer II 11 path 11 is 89] completed IL 11 path 4 (7 ) Senyu Riki”%: K sent, tI sent.

Clean/Otsu, operation λ it J-) CI1 rest 1γrry in part 15
++ Rest signal from constant circuit 1. 1-C through the OR circuit 4 of the fFIIJJ signal bar 1,
-ノ'〉・Do times IIl1′-15(7)-7 (Receive the end of l, and 1'il.lτα{1 kisi・1・valve stop 11 Buddha j, 33 Mi to note 1・circuit / through [-, works fine {1 Samurai River timer circuit 8 person, Ha will be accepted by Mizui)
Natsu-(-゛), this operation, the output signal Q:l of the imma circuit 8 is sent to the AND circuit [3σ] through the circuit 10.

In addition, row timer circuit 8.11&:J, each circuit 8,11
Input to -4 A) There is a circuit -C- which starts the Moema 61 measurement when Hakuyumi's 91- is entered, and these timer circuits and 3
, 11 (f1, 1 in Figure 5, -C
It is as shown in No. 1 with the J-bows 8 and 10 and the cutout 14'. Since the engine control device (in the body of the present invention) is configured in a highly detailed manner, two cylinders are operated (4J 1, ・I-CI1-. F,, Shinkyumi 81
From high level (taitsutsu Shinkyu) to low level (actuated Shinkyumi)
As a result, [see Figure 6 (, 1)]! 6), the output signal S2 of the OR same circuit 4 goes to low level [6th
See figure ([))], this belief EH2c7. ) Low level and timer circuit 8 or 1'-, Notu 1/Circuit 1
[] With the high level or low level of Shingetsu 346 via [], AND circuit 5 or Benstop 11-2 Buddha Y strikes Buddha becomes "1-level y." [Figure 6 (C), (f ) Reference) HH
<) In this way, the tf stop [1 signal F becomes the 17- level [-11-], wa, j' stop, the operation 1.2 is transmitted to the device 6, and J''1 is activated as appropriate. At the timing of fltll, the rest state of 1 (since the switching control of the operating states y, q-\, is in the same position as j') is 1゛-, (・'). , and, 2 similar h (gun light, situation seven, -
LJI fishing to the 1st and 4th winter tjt, %,, i-heavy transition state 11
, 5 昘IIi. From [] to operation maintenance time 'I';+take,
f' [Movement & {I Jishin Bow - (Compensation bow S6 is [J level/l Heat ga I' [Movement fiber 1; 1] Tie-7 circuit 8 to A/D circuit 5
・＼Has been released. 1:C) Nichi) One (Haru., Jin-(7) Made i (it.1 thread {{Duration 'L'a4.l,
Medium: It is designed to change by 2 according to the vehicle speed 11j from the constant circuit 9, and when most of this Irisho E is at a high level (during high-speed driving), 51st"lf/This shows 1. Ranjisda [゛Changk.l.
e) is shown by the solid line, and this ? ! i, I-+85
is compared with the reference voltage I [input 71 and the comparator 12,
As a result, as shown by the solid line in FIG. 6(f), the signal S
6 becomes low level for 1,/ζ time in response to high military speed.

When the high speed determination signal Sa is still at a low level (during low speed driving), the transistor 'J. 'r: Ushi], became a harp, and a compensator (゛1 thing discharge? {j, 1{S
5 is shown as a broken line in Fig. 6 (()), and compared with this city 1 voltage 85 FA, reference voltage 15 V 1 converter 12, the result is shown as a solid line and a broken line in Fig. 6 (r). ', sea urchin, 1 fortune' - month {6, U7'i 1 hour due to low city speed (this time is IL, the time J, which is longer than the recorded high vehicle speed)
Only low level and 7.

In other words, when the vehicle speed is high, ? The consumption rate of +-1 is large (y.), and the 8 with 4 cylinders
Holding 1 and 4 between...? In a short period of time (here, 0..2 seconds). This prevents an overrich condition. When the engine speed is low, conversely, the consumption rate of retained fuel is small, so the time to maintain the 4-cylinder state is set for a long time (2 seconds in this case) to prevent an overrich state. ,ing.

During this operation maintenance time ``1''a, when the signal force i for switching from the 4-cylinder operating state to the 2-cylinder operating state is transmitted from the cylinder determination circuit 1 (times indicated by reference numerals 1 and 3 in Fig. 6), , instead of immediately switching from i-cylinder operation to 2-cylinder operation, the 0.
2 seconds (when driving at high speed) or 2 seconds (when driving at low speed),
It is designed to maintain all-cylinder operation.

In this embodiment, when switching from a four-cylinder operating state to a two-cylinder operating state (see t1 shown in FIG. 6), the signal S1 changes from a low level (cylinder signal) to a low level.
By becoming a bell (actuation signal), the output signal S2 of the OR circuit 4 becomes a NO level, and the NO of this signal 82 becomes a NO level.
level and the high level of the signal S6 from the operation maintenance timer circuit 8 via the NOT circuit 10. The valve stop signal S6 from the AND circuit 5 becomes high level.

When this valve stop signal S6 reaches a high level, a cylinder stop signal is sent to the valve stop device 6, and the control operation state is changed at an appropriate timing. Furthermore, from the time t1 when the four-cylinder operating state is switched to the two-cylinder operating state, the cylinder-off maintenance time 'I'L) is performed.
The cylinder deactivation maintenance signal (signal S9 is at a high level) is transmitted from the comparator 13 of the cylinder deactivation maintaining section 14' to the AND circuit 16 for only 0.2 seconds). [Figure 6 (1)
)] The cylinder deactivation maintenance time 't'b is when the valve stop signal S3 is at a high level, and when the output signal S8 of the converter 13 is at a high level, the AND circuit 16 is at a high level. This is the time during which the valve stop signal S6 remains at a high level.

[See Figure 6 (l))] The output signal S8 from the converter 13 becomes the NO level when the valve stop signal S3 is at the low level, or when the valve stop signal S3 is at a higher level than the low level. This is the period from when the cylinder is switched to until the cylinder deactivation maintenance time 'rb has elapsed.・In other words, when the valve stop signal S6 is at a low level, the transistor Tr1 as the NOT circuit-7 is turned on, the signal S4 is at a high level, and the transistor Tr2 is turned on, which causes the signal S7 to be at a low level. So... This signal S7 and the reference voltage V2 are compared by the comparator 13, and the output signal S8 of the comparator 13 becomes the NO level. [See Figures 6(d) and (g)] Damn it, the valve stop signal S5 is at low level. Rino... Since the valve stop signal S6 is at the no-level level after switching to the shut-off level until the cylinder deactivation maintenance time 'rb, the transistor rr1 is turned off and the signal S4 is at the low level. Shitakate... The transistor 1'r2 is turned off, the electric current ETES7 is gradually charged by the capacitor C2, and when this charging voltage S7 is below the reference voltage V2, the output signal S8 of the comparator 13 becomes high level.

During this cylinder deactivation maintenance time]"b, from the 2 cylinder operating state to 4
When the signal for switching to the cylinder operating state is also transmitted from the cylinder deactivation determination circuit 1 (time indicated by reference numeral t5 in FIG. 6), the switching from the 2-cylinder operating state to the 4-cylinder operating state is not immediately performed, but is carried out immediately before. The cylinder deactivation state is maintained for 0.2 seconds from the time of switching from the four-cylinder operating state to the two-cylinder operating state (time indicated by reference numeral t4 in FIG. 6).

This cylinder deactivation maintenance signal ensures that the cylinder deactivation state is at least O even if the exhaust valve stops first when the cylinder is deactivated. This is maintained for 2 seconds, and the combustion gas trapped in the cylinder escapes into the crank chamber from between the piston and the inner wall of the cylinder as the piston reciprocates.

In the above embodiment, even if a fist-stable multi-by-break is used as each timer circuit, the stable multi-by-break in the 7th circuit d1 '1, Ku's person's J1lji old (= output of two-person circuit)
(output of the ibrator) From Mizui to the Nosoto circuit [-r output signal is supplied - J113], and the two people and the circuit's Sennin 2 Nozuki are connected to this tie-7 circuit (Ha Assuming that the output terminal of the 31'1 stable multi-by-break is connected to the output of the timer circuit 71i. It may be configured so that i and j are equal to one and two.

1, -14 and 7, according to the 144th edition of the cylinder-deactivated engine invention invented by O, f
After a predetermined period of time from the time of switching 'lI'ilI state ρ town\
Because it is possible to maintain the dynamic state of
With the switch from the body sieve state to the operating state, 1.1 to 1
{It has the advantage of being able to sufficiently prevent the fuel supply to the IK from becoming overrich, and problems such as engine stoppage caused by an oversupply of the IK can be avoided. Ru.

[Brief explanation of drawings]

Figures 1 to d are small illustrations of the state of the fuel inlet in the intake manifold in a conventional cylinder deactivation valve/control device. A schematic diagram during all-cylinder operation, Fig. 1 is a schematic diagram of when all cylinders are running to idle operation, and when the helicopter is changed to K, Z, and Figs. :J,/J./jllll control device, Fig. 4 Q, 1, its overall configuration is shown in a sized block diagram, Fig. 5
Figure kl) The 71L circuit diagram, Figure 6 (..1)~(]
) (Haizu J-R also has its effect in 7 [Kuzu Grano. 5 and circuit, 6
As a body cylinder means, C4->J mouthpiece 11 device, 7 notes I
・Circuit, 8 Evening timer circuit for maintaining operation, 9 Vehicle series judgment circuit, 11. Timer circuit for maintaining cylinder suspension, 12.13
Comparator, 14.14'... Inactive cylinder holding section, 15 operation operation ""'fQ'J:, 16... AND circuit, C1, (S2
Content y1, l, Ii, Tr2, Tr3...h transistor. -234- ・． ：：：． ．． ．． ': 235-

Claims (2)

[Claims] (1) In a deactivated engine that can control the number of active cylinders and perform full cylinder operation or partial cylinder operation, one cylinder is in the operating state and the body cylindrical fβ ＼ ＼ 1 month. In order to control the body cylinder means of the same cylinder, it is equipped with a cylinder deactivation determination section capable of transmitting a cylinder deactivation signal, and detects the cylinder deactivation of the above-mentioned part in the operating state. The idle cylinder from Ube sends out the operating state of the same cylinder, giving priority to this even in the ringing, and transmits the operating state of the cylinder to the above-mentioned body cylinder means. utter {g'L urui/[movement 9i 1 holding part or crotch I
7-(, 11f1 operation retainer or body cylinder 11, state of the cylinder in the
- Issuing the raising + t + Ff'l operation sustaining signal, the engine control device 1, which uses the 11 activation of the timer circuit for maintaining the operation as the 'Fr' sign. (2) I-record cylinder engine?'' 41 vehicles are equipped with a military speed sensor that detects the speed of the vehicle, and based on the error signal from the vehicle speed sensor ν1, A vehicle speed determination circuit is provided to increase or decrease the transmission interval of the operation maintenance signal transmitted from the operation maintenance timer circuit.