JPS61175248A - Electronic controlled fuel feeder equipped with supercharge correction mechanism - Google Patents

Abstract

PURPOSE:To permit the exceedingly fine control by corresponding the fundamental fuel amount according to each injection correction coefficient when the difference between the trouble opening-degree with the preceding ignition pulse and the throttle opening-degree with the ignition pulse at this time varies over a prescribed value. CONSTITUTION:The output theta of a throttle opening-degree sensor 1 is input into a judging device 3 in a CPU12, and the difference of each input of the ignition signal IG from the preceding opening-degree thetan-1 is obtained, and said difference signal DELTAQact is sent into a tailing corresponding device 4. The value DELTAQact is compared with the value obtained by multiplying the preceding output DELTAQ1 by a tiling by a tailing constant, and the larger value is set as the output DELTAtheta1 at this time. The fundamental acceleration increment value QAB is obtained from the value DELTAtheta1 and the engine revolution speed signal Ne in a fundamental increment fuel setting device 8. From the time when the value DELTAQact varies by a prescribed value of more, each injection correction coefficient signal Kc is outputted by an injection correction coefficient setting device 9, and said signal Kc is multiplied by THETAAB in a multiplier 10, and set as the acceleration increment value QACL, and the final injection amount QOUT is obtained by multiplying the fundamental injection amount Q by said value QACL.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronically controlled fuel supply system, and particularly to an electronically controlled fuel supply system with a transient correction mechanism used in an automobile engine.

[Conventional technology]

Generally, a gasoline engine is provided with a throttle opening sensor 1 that detects the intake angle.
There is a delay in fuel supply during transient periods due to fuel adhesion, etc., and especially during acceleration, torque gran due to over lean occurs, so some kind of correction is required.

Conventionally, as shown in Fig. 5, when the throttle valve is opened,
When this throttle opening signal θ is changed as shown in FIG. 6(a), the capacitor 13 and
□ and a resistor 14, the differential signal (dθ
/dt) is A/D converted by the A/D converter 15, and the CPU 12 serving as a control means performs transient correction corresponding to the differential signal (dθ/dt).

That is, the fuel injection amount consists of the basic injection amount and its correction amount, or the basic injection amount and its coefficient, as shown in the following equation.

(Injection amount) = (Basic injection amount) Ten correction amount (dθ/dt)・
・(1) (Injection amount) = (Basic injection amount) XK, f (dθ/
(2) [Problems to be Solved by the Invention] However, in the conventional fuel supply amount transient correction means, as shown by the broken line in FIG. 6(c), the correction request value is , the differential signal (dθ/dt) is not supported, there is a problem that appropriate transient correction cannot be performed.

The present invention aims to solve these problems, and provides an electronically controlled fuel with a transient correction mechanism that enables fine-grained control by reading the throttle opening signal for each ignition signal. The purpose is to provide a feeding device.

[Means for solving problems]

Therefore, the electronically controlled fuel supply device with a transient correction mechanism of the present invention includes a throttle opening sensor that detects the throttle opening of a throttle valve installed in the intake system of the engine, and an ignition pulse that detects the ignition pulse of the engine. a detector;
basic fuel amount determining means for determining the basic amount of fuel to be supplied to the engine in response to detection signals from the throttle opening sensor and the ignition pulse detector as set forth above; a computing unit that receives a detection signal from the detector and computes the difference between the throttle opening in the previous ignition pulse and the throttle opening in the current ignition pulse for each ignition pulse of the Ennon; an every-injection correction coefficient setter that can sequentially output an every-injection correction coefficient signal from when the above-mentioned difference signal changed to a predetermined value or more; A corrected fuel amount determining means for determining a corrected amount of fuel to be supplied to the engine is provided, wherein the basic fuel amount signal from the basic fuel amount determining means and the corrected fuel amount from the corrected fuel amount determining means are provided. The present invention is characterized by being provided with a fuel supply mechanism that supplies fuel to the engine based on the signal.

[Effect]

In the above-mentioned electronically controlled fuel supply system with a transient correction mechanism of the present invention, the injection correction coefficient is adjusted every injection starting from the time when the difference between the throttle opening in the previous ignition pulse and the throttle opening in the current ignition pulse changes to a predetermined value or more. The setting device sequentially outputs a correction coefficient signal for each injection, and the fuel supply mechanism supplies the fuel to the engine based on the correction fuel amount determined according to the correction coefficient signal for each injection and the basic fuel amount output from the basic fuel amount determining means. The amount of fuel to be supplied is determined.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
Figures 1 to 4 show an electronically controlled fuel supply system with a transient correction mechanism as an embodiment of the present invention. Figure 1 is a block diagram showing its overall configuration, and Figure 2 shows its operation during fuel increase correction. 70-chart for explaining, Figure 3 (,) to (
d) and FIG. 4 are graphs for explaining the effect during the increase correction.

As shown in FIG. 1, a throttle opening sensor 1 is attached to the throttle valve in the intake system of the engine, and the throttle opening θ is detected from the throttle opening sensor 1.
is a determining device (calculating unit) that constitutes the control means (CPU) 12.
This determiner 3 inputs the throttle opening degree θ every time it receives the ignition pulse (ignition signal) Ig from the ignition coil (ignition pulse detector) 2, and also inputs the throttle opening degree θ. Ignition pulse 1. Throttle opening degree θn and (low 1)
The difference from the throttle opening θn-1 in the 1st ignition type L-less Ig is taken, and this difference signal Δθact (=
θn-θn-1) is sent to the tailing processor 4.

In the tailing processor 4, the current input signal Δθa
ct and the previous output Δθ1 with a tailing constant γ (
0 × γ × 11 (for example, 0.5) multiplied by (Δθ! × γ
), and the larger one is set as the current output Δθ1.

Then, the signal Δθ after the tailing process is sent to the basic increase fuel setting device 8, and the signal Δθ after the tailing process is sent to the basic increase fuel setting device 8.
1 and the engine rotational speed signal Ne from the ignition coil 2, a basic acceleration increase value QAB, which is set in advance using a map, is determined by interpolation.

This basic acceleration increase value QAB is sent to the multiplier 10.

Further, the difference signal Δθact is sent to the comparator 6, which compares this difference signal 4θact with the acceleration judgment value setter 5.
When Δθact≦a changes to Δθact>α, that is, Δθact
>ff is established for the first time, the counter 7 is reset to the initial value N. Set (5 to 10).

This counter 7 is configured as a down counter, and outputs a value N obtained by subtracting the ignition pulse Ig from the ignition coil 2 by one as a clock signal to the every-injection correction coefficient setter 9.

As shown in FIG. 4, the every-injection correction coefficient setter 9 outputs the every-injection correction coefficient Kc(N) corresponding to the current value N to the multiplier 10.
=1.

Note that this every-injection correction coefficient Kc (N) is set to an arbitrary value according to N from the time of acceleration determination (immediately) so that it becomes the required fuel injection amount at the time of increased acceleration. It is stored in the memory section of the every-injection correction coefficient setter 9.

The multiplier 10 multiplies the basic acceleration increase value QAB by the every-injection correction coefficient Kc, and converts the multiplied acceleration increase value (corrected fuel amount) QAct (=QAeXKc) into the corrected fuel amount determining means A.
It is output to the adder 18 as an output.

Then, throttle opening sensor 1. Ignition coil 2 and sensor group (air 70-sensor, intake temperature sensor, water temperature sensor, boost sensor, vehicle speed sensor, idle switch, ignition switch).

Throttle opening signal from cooler relay 102 sensor, inhibitor switch, buffer voltage sensor, idle speed control motor position switch) 19,
Engine speed signal and other detection signals (intake air amount, intake air temperature, cooling water temperature, boost pressure, atmospheric pressure, *
speed, engine idle.

cranking status, air conditioner operation, oxygen concentration in exhaust,
A basic injection amount determiner (N range detection, battery voltage, idle speed control plunger reference position) that outputs the basic injection amount (basic fuel amount) Q, which is feedback-corrected by the required air-fuel ratio and water temperature correction, to the adder 18 ( Basic injection amount determining means) 20 is provided.

In this way, the acceleration increase value QA sent to the adder 18
A signal Q out, which is the sum of CL and the basic injection amount Q, is sent to an injector (capretor with an acceleration pump) 11 as a fuel supply mechanism.

Since the electronically controlled fuel supply system with a transient correction mechanism as an embodiment of the present invention is configured as described above, it is shown in FIG.
As shown in d), each time the ignition pulse Ig is input, various data including the throttle opening signal are input, and each time the input data is input, the routine for each ignition shown in Figure #2 is executed. Based on this, the basic injection amount Q is determined and the acceleration increase value QACL is determined.

That is, in the n-th ignition pulse Ig, first,
゛Decrement the count N of the counter by 1 and set (N-1) as the new count N.Step al) If it is the first acceleration, go through the YES route from step a2 and proceed to step a3. , the count N of the counter is set to the initial value N. Set to (
Step a3)6 Then, when the throttle opening θ changes as shown in FIG. 3(a), the (nl)th throttle opening θn−1 from the memory and the current nth throttle opening θn Taking the difference Aθact (=θn-θn-1), we get [S
:, step a4. See Figure 3(b)],
In step a5, this difference signal Δθact is compared with the acceleration determination threshold a, and if Δθact≦a, Δθ
Set act to zero (this step a6) and set Δθact>Q
If so, leave Δθact as is and proceed to step a7.
leading to.

Then, the previous output Δθ1 multiplied by the tailing constant γ (Δθ1×γ) is compared with Δθact (step a7), and if Δθact>(Δθ,×γ), Δθact is changed to the current output. As the output Δθ1 (step a
8), if Δθact≦(Δθ1×γ), then (Δθ1
×γ) as the current output Δθ1 [step a9. Third
See figure (c)].

Note that the chain line in Fig. W43 (c) shows Kc(N) corresponding to the count N from time 1° to t.

Then, the acceleration correction calculation value Δθ determined in this way
1 and the basic acceleration increase value QAB obtained according to the engine speed Ne, and the acceleration increase value QACL according to the product of the every-injection correction coefficient Kc (N) (step a10)
.

That is, if Δθact>a, the every-injection correction coefficient K
Control is performed for each ignition pulse Ig using c, and the tailing process is controlled from when Δθact,≦a.

In this way, the acceleration increase value QACI- obtained in the every-ignition routine shown in FIG. 2 is added to the basic injection amount Q.
The injection quantity Qout is determined and sent to the intake system of the engine at the injector (carburetor with accelerator pump) 11.

According to this embodiment, it is possible to realize a relatively large amount of required correction at the initial stage of acceleration, and it is possible to realize a required correction amount that does not correspond to the difference signal Δθact of the throttle opening θ.

By the way, in this embodiment, the basic injection amount is corrected by calculating the acceleration increase value when the automobile accelerates.
In order to prevent a delay in torque reduction due to over-richness during deceleration, each formula and coefficient may be determined as appropriate to obtain a deceleration reduction value (corrected fuel amount) and correct the basic injection amount.

〔Effect of the invention〕

As described above in detail, the electronically controlled fuel supply device with a transient correction mechanism of the present invention includes a throttle opening sensor that detects the throttle opening of a throttle valve installed in the intake system of the engine; The engine includes an ignition pulse detector that detects ignition pulses, and basic fuel amount determining means that receives detection signals from the throttle opening sensor and ignition pulse detector to determine the basic amount of fuel to be supplied to the engine. , receives detection signals from the throttle opening sensor and the ignition pulse detector, and calculates the difference between the throttle opening in the previous ignition pulse and the throttle opening in the current ignition pulse for each ignition pulse of the engine. an arithmetic unit that calculates the difference, an every-injection correction coefficient setter that can sequentially output an every-injection correction coefficient signal from when the above-mentioned difference signal calculated by the arithmetic unit changes to a predetermined value or more; corrected fuel amount determining means for determining the corrected fuel amount to be supplied to the engine in accordance with the respective injection correction coefficient signal, the basic fuel amount signal from the basic fuel amount determining means and the corrected fuel With a simple configuration that includes a fuel supply mechanism that supplies fuel to the ennon based on the corrected fuel amount signal from the amount determining means, a free increase/decrease pattern of the fuel amount can be obtained by making corrections for each injection. This has the advantage of allowing more precise control to be carried out.

[Brief explanation of drawings]

Figures 1 to 4 show an electronically controlled fuel supply system with a transient correction mechanism as an embodiment of the present invention. Figure 1 is a block diagram showing its overall configuration, and Figure 2 shows its operation during fuel increase correction. 70-chart for explaining, Figures 3(a) to (
d) and Fig. 4 are graphs for explaining the effect during fuel increase correction, Figs. 5 and 6 show the conventional fuel supply amount transient correction means, and Fig. 5 shows its overall configuration. The block diagram and FIGS. 6(a) to 6(c) are graphs for explaining the operation. 1. Throttle opening sensor, 2. Ignition coil (ignition pulse detector), 3. Judgment device (computer),
4. Tailing processor, 5. Acceleration judgment value setting device, 6
...Comparator, 7..Counter, 8..Basic increase fuel setting device, 9..Each injection correction coefficient setting device, 10..Multiplier, 1
1. Injector (or carburetor with acceleration pump) as a fuel supply mechanism, 12. Control means (CPU)
, 13... Capacitor, 14... Resistor, 15... A/
D converter, 16...differentiator, 18...adder, 19...
Sensor group, 20: Basic injection amount determining device (basic injection amount determining means), A: Correction fuel amount determining means, B: Basic fuel amount determining means.

Claims (1)

[Claims] A throttle opening sensor detects the throttle opening of a throttle valve installed in the intake system of the engine, an ignition pulse detector detects the ignition pulse of the engine, and the throttle opening sensor and ignition pulse detector basic fuel amount determination means for determining a basic fuel amount to be supplied to the engine in response to a detection signal from the throttle opening sensor and the ignition pulse detector; a computing unit that calculates the difference between the throttle opening degree in the previous ignition pulse and the throttle opening degree in the current ignition pulse every time;
An every-injection correction coefficient setter that can sequentially output an every-injection correction coefficient signal from when the above-mentioned difference signal calculated by the calculator changes to a predetermined value or more; and an every-injection correction coefficient that is output from the setter. Corrected fuel amount determining means for determining a corrected amount of fuel to be supplied to the engine in response to a signal is provided, the basic fuel amount signal from the basic fuel amount determining means and the corrected fuel amount determining means from the corrected fuel amount determining means. An electronically controlled fuel supply device with a transient correction mechanism, comprising a fuel supply mechanism that supplies fuel to the engine based on a corrected fuel amount signal.