JP3279982B2 - Method and apparatus for controlling fuel injection amount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection amount control method and apparatus for controlling the fuel injection amount of each cylinder of an internal combustion engine having a plurality of cylinders.

[0002]

2. Description of the Related Art Conventionally, in a multi-cylinder internal combustion engine (hereinafter, referred to as an engine), due to a manufacturing tolerance of a fuel injection device and the like,
The rotation speed of each cylinder varies, and therefore, there has been a problem that low-frequency vibration is generated particularly during idling. Then, for example, Japanese Patent Application Laid-Open No. Sho 59-222434.
As disclosed in the publication, the rotational speed of each cylinder is detected, the average rotational speed of each cylinder is calculated, and the difference between the average rotational speed and the detected rotational speed of each cylinder is calculated. When the difference is large, the engine speed is stabilized by a fuel injection amount control device that corrects the injection amount of the cylinder. In Japanese Patent Publication No. 6-78737, the instantaneous speed of each cylinder is calculated, and the injection amount of each cylinder is corrected based on the difference between the average value of the instantaneous speed of each cylinder and the instantaneous speed of each cylinder. A technique for improving control characteristics has been disclosed.

[0003]

However, the variation in the rotational speed of each cylinder includes a portion determined by the explosion of the fuel injected in the cylinder and a portion affected by inertia due to the explosion before that. As in the conventional fuel injection amount control method described above, when the next injection amount of the cylinder is corrected assuming that the variation of the rotation speed of each cylinder is caused only by the cylinder, the rotation speed becomes overcorrected. In order to set the engine speed to the target speed, correction must be performed many times, and the engine speed cannot be quickly stabilized.

[0004] The present invention has been made in view of the conventional problems, and it is a fuel injection amount capable of accurately correcting the injection amount for each cylinder and controlling the engine speed to a target speed promptly. It is an object of the present invention to provide a control method and a device therefor.

[0005]

According to a first aspect of the present invention, there is provided a method for controlling a fuel injection amount, wherein the number of rotations of a plurality of cylinders is sequentially detected, and the number of rotations of each cylinder is determined based on the detected number of rotations of each cylinder. When controlling the fuel injection amount of the cylinder, the rotation speed of each cylinder is corrected based on the rotation speeds of the plurality of cylinders detected before the cylinder, and the rotation speed of the cylinder is corrected based on the corrected rotation speed. The fuel injection amount is controlled. The method of controlling the fuel injection amount according to claim 2, wherein the rotational speeds of the plurality of cylinders are sequentially detected, and when controlling the fuel injection amount of each cylinder based on the detected rotational speeds of the cylinders, The number of rotations of each cylinder is
The present invention is characterized in that correction is performed based on a rotation fluctuation value caused only by the injection amount of each cylinder in the cylinder, and the fuel injection amount of the cylinder is controlled based on the corrected rotation speed. In the fuel injection amount control method according to a third aspect of the present invention, when the rotational speeds of a plurality of cylinders are sequentially detected, and the fuel injection amount of each cylinder is controlled based on the detected rotational speeds of the respective cylinders. In addition, the rotational speed of each cylinder is detected by the rotational speed of each cylinder among a plurality of cylinders detected before the relevant cylinder (detected value).
And an average rotational speed of each cylinder is corrected based on an error rotational speed, and the fuel injection amount of the cylinder is controlled based on the corrected rotational speed.

[0006] The method of the fuel injection amount according to claim 4, the error speed, a rotation fluctuation value is an error rotational speed due only to the injection quantity of the cylinder, front tube is cylinder the last explosion The rotation fluctuation value of the cylinder is calculated as a linear combination with the rotation fluctuation value of the cylinder, and the value obtained by adding the calculated rotation fluctuation value of the cylinder and the average value is used as the corrected rotation fluctuation value. It is characterized in that the number of revolutions is caused only by the injection amount of the cylinder.

According to a fifth aspect of the present invention , in the fuel injection amount control method, the error rotational speed is represented by a linear combination of a rotational fluctuation value of the cylinder, a rotational fluctuation value of the front cylinder, and a rotational fluctuation value of the cylinder before the front cylinder. In this case, a rotation fluctuation value of the cylinder is calculated.

According to a sixth aspect of the present invention, there is provided a method for controlling a fuel injection amount, the rotational speed N ₀ (T) being caused only by the injection amount of the cylinder.
Is the measured value of the rotation speed of the cylinder, N (T), the error rotation speed of the previous cylinder is ΔN (T−t), and the coefficient representing the influence of the front cylinder set in advance by the size of the internal combustion engine is α and N
₀ (T) = N (T) −α · ΔN (T−t).

According to a seventh aspect of the present invention, there is provided a method of controlling a fuel injection amount, the rotation speed N ₀ (T) being caused only by the injection amount of the cylinder.
The measured value of the rotational speed of the cylinder is N (T), the error rotational speed of the previous cylinder is ΔN (T−t), the error rotational speed of the previous cylinder is ΔN (T−3t), The error rotation speed of the previous cylinder is Δ
N (T−4t), a coefficient indicating the influence of the front cylinder set in advance according to the size of the internal combustion engine and the like is α, and N ₀ (T) = N
(T) −α · ΔN (T−t) + α ³ · ΔN (T−3t)
And wherein the approximating formula consisting ^{-α 4 · ΔN (T-4t} ).

[0010] The fuel injection amount control device according to the eighth aspect of the present invention provides the fuel injection amount control device according to the sixth or seventh aspect , wherein the rotational speed caused solely by the injection amount of the cylinder and an average value of the rotational speed of each cylinder. The injection amount of each cylinder is controlled based on the difference.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a fuel injection device of a six-cylinder engine provided with a line pump according to an embodiment of the present invention, wherein # 1 to # 6 are engine cylinders, and 1 is each of the cylinders # 1 to # 6. A crankshaft connected to each of the pistons (not shown) through a connecting rod, a line pump 2 for supplying fuel to each of the cylinders # 1 to # 6, and a crankshaft 3 for controlling the injection amount of each of the cylinders # 1 to # 6. A rack to be controlled, 4 is a governor for driving the rack 3, 5 is a cam shaft of the line pump 2, 6 is a pulsar 6 A provided on the drive shaft 5, and a rotation comprising an electromagnetic pickup 6 B for detecting the position of the pulsar 6 A. It is a number detecting means. Further, the crankshaft 1 and the camshaft 5 are connected to the gear 1G of the crankshaft 1 and the gear 5 of the camshaft 5.
The rotation of the engine, that is, the rotation of the rank shaft 1 is transmitted to the camshaft 5 via the gears 1G and 5G to drive the line pump 2. Immediately after the piston (not shown) in each of the cylinders # 1 to # 6 of the engine reaches the top dead center (TDC), the electromagnetic pickup 6B has a protrusion 6a of the pulsar 6A provided on the cam shaft 5 of the line pump 2. 6f and the electromagnetic pickup 6B are installed at positions corresponding to each other, and detect that each cylinder of the engine has reached the position of TDC. Each of the cylinders # 1 to # 6 of the engine has a cycle of approximately 1/6 of one rotation of the line pump 2 (two rotations of the engine), and is # 1 → # 4 → # 2 →
It explodes in the order of # 6 → # 3 → # 5 → # 1 → # 4, ‥‥, and rotates the crankshaft 1 of the engine. Revolution N of each cylinder
(T), as shown in FIG. 2, the pulser 6A and the electromagnetic pickup 6B the spacing of the output more is detected, i.e., to read calculates the distance of the TDC by the clock pulse interval t _0. For example, the output from cylinder # 1 and cylinder #
If there are P _n pulses between the output from the cylinder # 1 and the output from the cylinder No. 4, the output interval of the rotation speed N (T) of the cylinder # 1 is T _n = t _0.
Since _Pn , the number of cylinders is z (here, z = 6).
As, N (T) = 2 · 60 / (t 0 · P n · z) rp
m.

Next, the rotational speed N (T) of each of the cylinders # 1 to # 6
Will be described. First, an average of the rotation speeds N (T) of the cylinders during one rotation of the camshaft 5 of the line pump 2 is defined as an average rotation speed N _a (T). The rotation speed of the cylinder detected this time is N (T), the rotation speed of the cylinder detected last time is N (T-t), and the rotation speed of the cylinder detected two times before is N (T-2t). Also, the current rotation speed N
The difference ΔN (T) between (T) and the average rotation speed N _a (T) is defined as the error rotation speed, and the rotation fluctuation value caused only by the cylinder that has performed the injection this time is n (T), the cylinder detected k times before. Is assumed to be n (T−kT) (k is a natural number). N (T), n
(T-kT) is an unknown number. Incidentally, the error rotation speed ΔN (T) is different from the rotation fluctuation value n (T) caused only by the injection amount of the cylinder and the influence (α) of the previous rotation fluctuation value.
· N (T-t)) and the effect (α ² · n (T- 2t)) of the last-minute rotation fluctuation value.
The error rotation speed ΔN (T) can be expressed by the following equation (1). Here, α is a coefficient due to the size of the internal combustion engine and the number of cylinders, and gives the magnitude of the effect of inertia due to the explosion before that.For example, when the number of cylinders is large, it becomes large, and the cylinder becomes large. It becomes smaller when large and heavy. In addition,
α <1. ΔN addition _{(T) = N (T)} -N a (T) = n (T) + α · n (T-t) + α 2 · n (T-2t) ‥‥‥ (1), due only to the cylinder rotational speed to n _{0 (T)} is the sum of the rotation variation value n (T) caused only to the injection quantity of the average rotational speed n _a and the corresponding cylinder. N ₀ (T) = N _a (T) + n (T) ‥‥‥ (2) According to the above equation (2), the above equation (1) can be modified as follows. N (T) = N ₀ (T) + α · n (T−t) + α ² · n (T−2t) ‥‥‥ (3) That is, the actually measured rotational speed N (T) of the cylinder is Α · n, which is the influence of the rotation fluctuation of the cylinder that exploded last time and two times before, with respect to the rotation speed N ₀ caused only by the cylinder.
(T−t) and α ² · n (T−2t). Alternatively, since the above equation (3) can be transformed into the following equation (3a), N ₀ (T) = N (T) −α · n (T−t) −α ² · n (T−2t) ‥‥‥ (3a) The rotational speed N ₀ (T) caused only by the cylinder is the influence of the rotational fluctuation of the cylinder that exploded last and last time from the actually measured rotational speed N (T) of the cylinder. It can also be said that α · n (T−t) and α ² · n (T−2t) are removed. In each of the above equations (1) to (3), N
_(T), N a (T), the value of such .DELTA.N (T) is determined from the measured, the equation (1) to (3) approximately in a unknown rotational fluctuation n (T) with Then, an approximate expression of the rotational speed N ₀ (T) attributable only to the injection amount of the cylinder can be obtained.

Hereinafter, a method of obtaining an approximate expression of the rotational speed N ₀ (T) which is caused only by the injection amount of the cylinder will be described. Equation (1) is repeated. ΔN (T) = n (T) + α · n (T−t) + α ² · n (T−2t) ‥‥‥ (1) From equation (1), the rotational fluctuation n (T) is given by the following equation: (4)
Can be represented by n (T) = ΔN (T) −α · n (T−t) −α ² · n (T−2t) ‥‥ (4) Here, the previous rotation fluctuation n (T−t) is expressed by the following equation. (4)
By replacing T with (T−t), n (T−
t) = ΔN (T−t) −α · n (T−2t) −α ² · n (T
−3t), and when this is substituted into equation (4), the rotation fluctuation n (T) is ΔN which is a value obtained from actual measurement.
Expression (5) using (T) and ΔN (T−t), and the rotation variation n (T−3t) three times before, which is an unknown number. n (T) = ΔN (T) −α · ΔN (T−t) + α ³ · n (T−3t) ‥ (5) Since α <1, the rotation fluctuation amount n (T−
3t) is a value obtained from actual measurement ΔN (T)
And ΔN (T−t). For example, α
= 0.7, the coefficient of ΔN (T) is 1, and ΔN (T−
The coefficient of t) is 0.7, while the coefficient of n (T-3t) is 0.34. Therefore, the rotation fluctuation n
When (T) is approximated by an expression n (T) = ΔN (T) −α · ΔN (T−t) that does not include an unknown number, the rotational speed N due to only the injection amount of the cylinder is obtained.
₀ (T) _{is, N 0 (T) = N} a (T) + ΔN (T) -α · ΔN (T-t) = N (T) −α · ΔN (T−t) ‥‥‥ (6). The above equation (6) is calculated by dividing N ₀ (T) by 1
It is called the following approximation formula.

In order to further advance the approximation, the rotation fluctuation amount n (T-3t) three times before is calculated as follows: n (T-3t) = ΔN (T-3t) -α · n (T-4t) -α
^It is substituted into equation (5) as ² · n (T−5t). The rotation fluctuation n (T) is given by n (T) = ΔN (T) −α · ΔN (T−t) + α ³ · ΔN (T−3t) −α ⁴ · n (T−4t) −α ⁵ · n (T−5t) ‥‥ (7) Further, when n (T−4t) is similarly replaced, n (T) = ΔN (T) −α · ΔN (T−t) + α ³ · Δ
N (T−3t) −α ⁴ · ΔN (T−4t) + α ⁶ · n (T−
6t). Here, since α <1, the term of α ⁶ is omitted, and when the rotation speed N ₀ (T) caused by only the cylinder is obtained, N ₀ (T) = N _a (T) + n (T) _{more, N 0 (T) = N} a (T) + ΔN (T) -α · ΔN (T-t) + α 3 · ΔN (T-3t) -α 4 · ΔN (T-4t) = N (T) −α · ΔN (T−t) + α ³ · ΔN (T−3t) −α ⁴ · ΔN (T−4t) ‥‥ (8) The above equation (8) is called a fourth-order approximation equation of N ₀ (T).

FIGS. 3 to 5 show each cylinder at the time of idling.
When the engine is rotated with the injection amount of
The change in the rotational speed N (T) of the cylinder and the above-described cylinder only
The resulting rotational speed N₀In the figure comparing the change of (T),
The axis is the number of the cylinder that exploded, that is, the cylinder whose rotation speed was detected.
, And the vertical axis indicates the number of rotations. FIG. 3 shows the injection amount of cylinder # 1.
FIG. 4 shows a case where the injection amount of cylinder # 1 is increased.
FIG. 5 shows an example in which there is no variation between the cylinders.
In the case of displacement, α = 0.7. The symbol in the figure is
Rotational speed N (T), circle in the figure is N₀(T) fourth-order approximation
Due to only the injection amount of each cylinder calculated using (8)
Number of rotations, ● in the figure is N₀Using the first order approximation of (T)
This is the calculated number of rotations caused only by the injection amount of each cylinder.
The mark x in the figure indicates the average value N of the rotation speed N (T).
_aThe change of (T) is shown. As is apparent from FIG.
The rotation speed N (T) of each cylinder decreases the injection amount of cylinder # 1.
Detonated next to # 1 cylinder above
The rotation speed of the cylinder No. 4 is the lowest. On the other hand,
Rotational speed N calculated using the following approximate expression (8)₀(T)
Is the highest rotation speed of the # 1 cylinder that actually reduced the injection amount.
It is lower. In addition, as shown in FIG.
Even if the injection amount is increased, it is the highest in N (T)
The rotational speed was detected not in the cylinder of # 1, but in # 4
Or the # 2 cylinder, on the other hand,
Rotational speed N calculated using (8) ₀In (T), actually
The highest rotational speed of the # 1 cylinder with increased injection volume
I understand. The above experimental results show that the rotational speed of each cylinder is
The part determined by the cylinder explosion and the explosion before that
Clearly show that there is a part due to the effect of inertia
ing. Therefore, when controlling the fuel injection amount of each cylinder,
Is larger than the detected rotation speed N (T) of the cylinder.
From the rotation speed N (T), the inertia due to the earlier explosion described above
Only the injection amount of each cylinder obtained by removing the part due to the influence of
Speed N caused by ₀It is more appropriate to use (T)
I understood. It should be noted that the calculation using the above-described linear approximation equation (6) is performed.
Number of rotation N issued₀The change in (T) depends on the detected rotation of each cylinder.
Using the above fourth-order approximation (8)
Rotation speed N calculated₀(T), first-order approximation (6)
However, we need to find the number of revolutions that can only be attributed to the injection amount of each cylinder.
It can be understood that it can be done.

FIG. 6 is a diagram showing a configuration of a control unit of the fuel injection device according to the embodiment of the present invention. The fuel injection device, the target injection amount from the accelerator opening A _cc and the engine speed N _e and the like by the target processing unit 7 Q ₀ and the target rotation speed N _t
Calculates the, by injection correction amount calculating means 8 obtains a correction value ΔQ by PID control of the difference between the target rotational speed N _t and the engine speed N _e, adds the above Q ₀ and ΔQ in the adder 9. On the other hand, each cylinder control unit 10 calculates a rotation speed N ₀ (T) caused only by the injection amount of each cylinder, and calculates the rotation speed N _0.
A correction value q of the injection amount of each cylinder is calculated based on (T),
From the added injection amount Q = Q ₀ + ΔQ, the correction value q
Is input to the rack controller 12. The rack control means 12 controls the position of the rack 3 in FIG. 1 based on the input injection amount and controls the fuel injection amount of each cylinder. The cylinder control unit 10 is configured to average the rotation speed N (T) of each cylinder during one rotation of the camshaft from the input rotation speed N (T) of each cylinder # 1 to # 6. an average value calculating means 13 for calculating the _a (T), the average rotational speed _{N a} and the cylinder rotation speed N (T) because the error rotational speed ΔN (T), ΔN (T -3t), ΔN (T- 4t), and the above-described fourth-order approximation formula of N ₀ (T) (from the rotational speed N (T) of the cylinder and the respective error rotational speeds such as ΔN (T)). 8), the corrected rotation speed calculating means 15 for calculating the rotation speed N ₀ (T) caused only by the injection amount of the cylinder, the rotation speed N ₀ (T) and the average rotation speed N _a (T ), And a subtractor 16 for taking the difference from
A cylinder injection amount correcting means 17 for calculating a correction value q of the injection amount of the cylinder from the difference, calculating a rotation speed N ₀ (T) caused only by the injection amount of each cylinder, and calculating the rotation speed N
A correction value q of the injection amount of each cylinder is calculated and output based on ₀ (T). Incidentally, the correction value q is the change-over switch 18, _N e _<N L, is sent only to the subtracter during idling is _A cc _{<A L,} so as to control the fuel injection quantity of each cylinder during idling ing. As described above, the fuel injection device according to the present embodiment uses the difference between the average rotation speed N _a (T) and the rotation speed N ₀ (T) that is caused only by the injection amount of the relevant cylinder during idling. Since the fuel injection amount of the cylinder is controlled, the engine speed can be quickly controlled to the target speed.

In this embodiment, the control device for the fuel injection amount provided with the line pump has been described. However, the present invention is not limited to this. For example, dispensing pumps,
Fuel for a multi-cylinder internal combustion engine such as a fuel injection device for diesel engines equipped with an injection system such as a unit injector, a direct injection device for gasoline engines, and an intake pipe injection device that independently injects each cylinder intake pipe Also in the injection device, the number of rotations N ₀ caused by only the injection amount of each cylinder described above
By controlling the fuel injection amount using (T), the engine speed can be quickly stabilized. Further, in the above example, the rotational speed N due to only the injection amount of the cylinder is calculated as the rotational speed N calculated using the fourth-order approximation (8).
₀ (T), but may be the rotation speed N ₀ (T) calculated using the first-order approximation formula (6). Alternatively, in the following fourth-order approximation equation (8), N ₀ (T) is approximated to a third-order term, and N ₀ (T) = N (T) −α · ΔN (T−t) + α ³
-It may be ΔN (T-3t).

[0018]

As described above, according to the first aspect of the present invention, the detected rotational speed of the cylinder is determined based on the rotational speeds (detected values) of a plurality of cylinders detected before the cylinder. By correcting, the influence of inertia due to the previous explosion was eliminated, so by using this corrected rotation speed for controlling the injection amount, the injection amount for each cylinder can be accurately corrected, The engine speed can be quickly controlled to the target speed. According to the second aspect of the invention, the detected rotational speed of the cylinder is detected before the detected cylinder.
By correcting based on the rotation fluctuation value caused only by the injection amount of each cylinder in a plurality of cylinders, the influence of inertia due to the previous explosion was eliminated, so that the injection amount for each cylinder was accurately determined. Correction can be made, and the engine speed can be quickly controlled to the target speed. Claim 3
According to the invention described in the above, the detected rotation speed of the cylinder, the error rotation speed that is the difference between the rotation speed of each cylinder in the plurality of cylinders detected before the cylinder and the average value of the rotation speed of each cylinder, By performing the correction based on the above, the influence of the inertia due to the previous explosion is eliminated, so that the injection amount for each cylinder can be accurately corrected, and the engine speed can be quickly controlled to the target engine speed.

According to the invention described in claim 4, said error speed, a rotation fluctuation value is an error rotational speed due only to the injection quantity of the cylinder, the rotation fluctuation of the front tube is cylinder the last explosion Since the rotational fluctuation value of the cylinder is calculated as a value that can be expressed by a linear combination with the value, the value obtained by adding the calculated rotational fluctuation value of the cylinder and the average value is defined as the corrected rotational speed. Thus, the rotation speed of the cylinder can be accurately corrected.

According to the fifth aspect of the present invention, the error rotational speed can be represented by a linear combination of a rotational fluctuation value of the cylinder, a rotational fluctuation value of the front cylinder, and a rotational fluctuation value of the cylinder before the front cylinder. , Because the rotation fluctuation value of the cylinder is calculated.
The rotation speed of the cylinder can be more accurately corrected.

According to the sixth aspect of the present invention, the rotational speed N ₀ (T) caused only by the injection amount of the cylinder is set to N
₀ (T) = N (T) −α · ΔN (T−t), the rotation speed of the cylinder is calculated as the previous error rotation speed ΔN
It can be easily corrected using (Tt).

According to the seventh aspect of the present invention, the rotational speed N ₀ (T) caused by the injection amount of the cylinder is set to N ₀ (T) =
N (T) −α · ΔN (T−t) + α ³ · ΔN (T−3
made ^{t) -α 4 · ΔN (T} -4t) since approximated by the formula,
The accuracy of approximation of the rotation speed of the cylinder can be improved.

According to the invention of claim 8 , according to claim 6,
Alternatively, the injection amount of each cylinder is controlled based on the difference between the rotation speed caused only by the injection amount of the cylinder described in claim 7 and the average value of the rotation speed of each cylinder. Thus, it is possible to obtain a fuel injection amount control device that can accurately correct the injection amount of the engine and quickly control the engine speed to the target speed.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a fuel injection device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a method of detecting the rotational speed of each cylinder.

FIG. 3 is a diagram comparing the detected rotation speed of each cylinder and the rotation speed caused by the injection amount of the cylinder when the injection amount of the cylinder # 1 is reduced.

FIG. 4 is a diagram comparing a detected rotation speed of each cylinder and a rotation speed caused by the injection amount of the cylinder when the injection amount of the cylinder # 1 is increased.

FIG. 5 is a diagram comparing a detected rotation speed of each cylinder with a balanced injection amount of each cylinder and a rotation speed caused by the injection amount of the cylinder.

FIG. 6 is a diagram showing a configuration of a control unit of the fuel injection device according to the embodiment of the present invention.

[Explanation of symbols]

# 1 to # 6 engine cylinders, 1 crankshaft, 2 line pumps, 3 racks, 4 governors, 5 camshafts, 6
Rotation speed detecting means, 6A pulser, 6B electromagnetic pickup, 7 target calculating section, 8 injection correction amount calculating means, 9
Adder, 10 cylinder control units, 11 subtractor, 12 rack control means, 13 average value calculation means, 14 error rotation speed calculation means, 15 correction rotation speed calculation means, 16 subtractor, 1
7 Each cylinder injection amount correction means, 18 changeover switch.

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI F02D 45/00362 F02D 45/00 362H 362J (56) References JP-A-62-23552 (JP, A) JP-A-59-221434 (JP) JP-A-59-82534 (JP, A) JP-A-7-286546 (JP, A) JP-A-61-207853 (JP, A) JP-A-60-184947 (JP, A) JP-A-10-148154 (JP, A) JP-A-8-177548 (JP, A) JP-A-6-241109 (JP, A) JP-A-6-42399 (JP, A) A) JP-A-6-42398 (JP, A) JP-A-5-33717 (JP, A) JP-A-7-180601 (JP, A) JP-A 8-291759 (JP, A) JP-A-5 JP-A-187302 (JP, A) JP-A-2000-18087 (JP, A) JP-A-10-148153 (JP, A) JP-A-10-122031 (JP, A) JP-A-11-132095 (JP, A) JP-A-58-214627 (JP, A) JP-A-9-177587 (JP, A) Patent 2982381 (JP, B2) JP 6-78737 (JP, B2) JP 7-54103 (JP, B2) JP 7-51917 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F02D 41/00-45/00

Claims (3)

(57) [Claims] When the number of rotations of a plurality of cylinders is sequentially detected and the fuel injection amount of each cylinder is controlled based on the detected number of rotations of each cylinder, the number of rotations of each of the cylinders is determined. Corrected based on the rotational speeds of multiple cylinders detected previously,
A fuel injection amount control method, wherein the fuel injection amount of the cylinder is controlled based on the corrected rotation speed. 2. When the rotational speeds of a plurality of cylinders are sequentially detected and the fuel injection amount of each cylinder is controlled based on the detected rotational speeds of the respective cylinders, the rotational speeds of the respective cylinders are determined. Correction is performed based on the rotation fluctuation value caused only by the injection amount of each cylinder in the plurality of cylinders detected previously, and the fuel injection amount of the cylinder is controlled based on the corrected rotation speed. A fuel injection amount control method characterized by the above-mentioned. 3. When the rotational speeds of a plurality of cylinders are sequentially detected and the fuel injection amount of each cylinder is controlled based on the detected rotational speeds of the cylinders, the rotational speeds of the cylinders are determined. Correction is performed based on an error rotation speed that is a difference between the rotation speed of each cylinder in the plurality of cylinders detected previously and the average value of the rotation speeds of the cylinders, and the fuel of the cylinder is corrected based on the corrected rotation speed. A method for controlling a fuel injection amount, wherein the injection amount is controlled.