JPS595841A - Fuel injection apparatus for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable to correct the injection quantity of fuel at the time of acceleration precisely, by providing a means for injecting fuel at a rate corresponding to the temperature of engine cooling water at the time of acceleration independently of a means for injecting fuel at a reference injection rate at the time of normal operation of an engine. CONSTITUTION:A reference fuel injection value Gf0 is calculated from the output signals of a sensor 1 for detecting the flow rate of intake air, an ignition circuit 8, a sensor 9 for detecting the temperature of intake air and a sensor 10 for detecting the temperature of engine cooling water, and a first timer 56 produces reference injection pulses P0 in synchronism with ignition signals 8a. On the other hand, a second timer produces acceleration incremental pulses PA corresponding to an acceleration incremental value GfA, utilizing an output signal 7a of an acceleration detector 7 as a trigger signal. The above value GfA is obtained from the temperature of water. With such an arrangement, it is enabled to corret the fuel supply rate precisely at the time of acceleration.

Description

[Detailed description of the invention] This invention relates to a fuel injection device for an internal combustion engine for an automobile.

Specifically, the present invention relates to a control device that can correct the fuel injection amount during acceleration.

A conventional device of this type was the one shown in FIG. In the figure, l is an intake air amount sensor that detects the amount of intake air taken into the internal combustion engine (hereinafter referred to as engine) 4, 2 is a throttle valve for adjusting the amount of intake air, and 3 is the engine 4.
A fuel injection valve 5 calculates the basic fuel amount, that is, the basic required fuel amount, based on the information obtained from the intake air amount sensor 1, and also calculates the opening state of the throttle 9 valve 2. , a control device that calculates all corrected fuel amounts from the operating temperature of the engine 4, the temperature of intake air, etc., and controls the valve opening time of the fuel injection valve 3 with a basic injection pulse and an acceleration increase pulse corresponding to each calculated value. , 6 is a suction pipe arranged on the inlet side of the engine 4.

In the conventional fuel injection device configured as described above,
On a regular basis, the control device 5 controls the fuel injection 99 to achieve a desired air-fuel ratio (λj) based on information from the intake air amount sensor 1.
However, when the opening speed of the throttle valve 2 is fast, there is a delay in detection by the intake air amount sensor 1 and a delay in fuel supply due to the injected fuel adhering to the inner wall of the intake pipe 6. As a result, the air-fuel ratio λ becomes transiently thinner, and a drop in engine output torque is unavoidable1. A contact-type acceleration detector 7 as shown in FIG. 2 is provided, and each time these contacts are closed.

Independently from the basic injection pulse PO which is output based on the original information from the intake air amount sensor 1.

The fuel was increased by generating 12 acceleration fuel increase pals.

This increase in fuel amount is determined by a predetermined mechanically determined opening degree of the throttle valve 2, for example, each time the throttle valve 2 crosses in the upward direction at the position shown by Ls + Ia + '4 in Fig. 3(a). The injection width corresponds to a fixed amount or an amount proportional to the basic fuel amount, and in parallel with this, the basic fuel amount is increased, and these two types of corrections accelerate the 1. As a result, in the conventional example, what is shown in FIG. 3 was obtained. That is, FIG. 3 shows the operation waveform of the Caloric speed increaser pulse P caused by the provision of the accelerating earthen vessel 7 shown in FIG.
Figure (a) shows the opening of the throttle valve, and figure (a) shows the acceleration increase/Grus PA.

FIG. 6(c) shows the basic injection pulse Po.

However, in recent years, there has been a shift from the conventional tendency to emphasize drivability to a tendency to emphasize fuel consumption rate, and it has become necessary to not only correct the amount of correction during acceleration so as not to impair the above-mentioned drivability, but also to make fine-grained corrections.

On the other hand, the warm-up correction amount calculated based on the water temperature detected by the water temperature detection unit is 130°C to 80°C.
It has been found that, while a dynamic range of about twice as much is required for the above-mentioned water temperature, the accelerated increase pulse water temperature correction amount calculated using the water temperature as a parameter requires a dynamic range of about 10 times. Therefore, in the case where the acceleration increase pulse is made dependent on the basic fuel amount as in the past, it is inevitable that a compromise must be made in correcting the acceleration. In addition, in the case where the engine is dependent on the basic fuel amount, during normal acceleration under a constant load condition, the intake air amount changes by about three times during full throttle acceleration.

However, since the acceleration increase pulse is required immediately after the accelerator is depressed and the throttle valve is suddenly opened, it is desirable that the acceleration increase pulse width at this time be small.

This invention was made in view of the above points, and is made by making the acceleration increase pulse independent of the basic fuel amount, making it dependent on the engine water temperature, and operating the control device using program settings. Another object of the present invention is to provide an internal combustion engine fuel injection device that can make corrections during acceleration more finely than conventional ones.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 4 shows a control device 5 showing an embodiment of the present invention, in which the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts, and detailed explanation thereof will be omitted.

In FIG. 4, a rotation speed detection unit 52 detects the engine rotation speed (hereinafter referred to as rotation speed) by calculating backwardly the synchronization of the ignition signal C1 output from the sl Fis ignition device 8, and 52 is a rotation speed detection unit that detects the engine rotation speed (hereinafter referred to as rotation speed). A divider 53 inputs the output signal 1a of the intake air and divides the intake air amount by the rotational speed to obtain the intake air amount per unit rotational speed. Intake temperature correction section, 5
4 is a warm-up correction unit which inputs the water temperature output 101L from the water temperature detection unit 10 and uses it as a parameter; 55 is the divider 52;
A multiplier that calculates the product of each output of the intake air temperature correction section 53 and the warm-up correction section 54, and calculates the basic fuel amount calculation value Gfo.
Output.

56 is a first timer which inputs the basic fuel amount calculation value Gfo and uses the ignition signal ga output from the ignition device 8 as a trigger to calculate the basic fuel amount calculation value Gf.

is loaded, and a basic injection pulse Po corresponding to the basic fuel amount calculation value Gfo is generated.

57 is a water temperature signal 10a output from the water temperature detection section 10.
Acceleration increase calculation value Gf using the water temperature obtained as a parameter
output the system. A second timer 58 is configured to load the acceleration increase calculation value GfA using the signal 7a from the contact point of the acceleration detector 7 as a trigger, and generate an acceleration increase pulse PA corresponding to the increase calculation value Gf*lC. has been done. Reference numeral 59 is a fuel injector drive circuit, which controls the basic injection/arm Po and acceleration increase/? The logical sum with the pulse PA is inputted as a valve opening pulse to drive the fuel injection valve 3.

Based on the above configuration, the operation of an embodiment of the present invention will be described.

First, the operation at the time of basic fuel amount injection in a steady state is explained in the fourth section.
This will be explained with figures. A control device 5 that controls the opening time of the fuel injection valve 3 by valve opening/main pulse so as to obtain a desired air-fuel ratio λ.
, a divider 52 inputs the output of a rotational speed detection section 51 that detects the rotational speed by calculating the cycle of the ignition signal 8a output from the ignition device 8 and the output signal 1a from the intake air amount sensor l. , Outputs the intake air amount for the corresponding rotation.

On the other hand, output 9 from the intake temperature detection section 9 and the water temperature detection section IO
a and lOa are used as parameters in the intake temperature correction section 53, warm-up correction section 54, and acceleration increase pulse water temperature correction section 57, respectively.

Next, the outputs of the divider 52, intake temperature correction section 53, and warm-up correction section 54 are input to a multiplier 55, and a basic fuel amount calculation value Gfo is calculated by multiplying these input values. is sent to the timer 56. The first timer is
The basic fuel amount calculation value Gfo is loaded using the ignition signal 8a of the ignition device 8 as a trigger, and a basic injection nozzle PO corresponding to the basic fuel amount calculation value Gfo is output, and this is used as the valve opening nous e. The nuclear fuel injector drive circuit 59 drives the fuel injector 3 through the OR (OR).

Next, the operation during accelerated bone mass will be explained with reference to FIG.

When the above-mentioned steady state in which the basic injection signal (Ruspo) is sent to the above-mentioned OR dirt OR by the above-mentioned first timer 56 by the operation of the above-mentioned ignition signal 8a changes to an accelerated state,
The second timer 58 inputs the acceleration signal 7a from the acceleration detector 7, and uses the acceleration signal 71L as a trigger to calculate the acceleration increase calculation value G calculated by the acceleration increase/gurus water temperature correction section 57.
fA is set to low P, and an acceleration increase pulse PA corresponding to the acceleration increase calculation value G4A is sent to the above-mentioned 0R)Ih-)OR. As a result, in the OR4'-) OR, the basic injection pulse Po and the acceleration increase pulse PA are logically summed, and the output thereof is sent to the fuel injection valve drive circuit 59 as a valve opening pulse. As a result, the fuel injection valve drive circuit 5
9 drives the fuel injection valve 3. Therefore, in this embodiment, the width of the acceleration increase pulse PA is made to depend on the water temperature independently of the basic fuel amount, so that the valve opening A? It is possible to finely correct the amount of fuel injection during acceleration.

In addition, in the above embodiment, the configuration was shown in a block diagram, but
This may be done programmatically.

Although a contact linked to the throttle valve is used as the acceleration detection means, for example, a throttle sensor may be used to detect the acceleration increase/J?
There is no problem even if a ruse is generated.

As described above, according to the present invention, by setting the acceleration increase/9-rus width depending on the water temperature independently of the basic fuel amount, it is possible to perform corrections during acceleration more precisely than before, and as a result, This has the advantage of being able to improve the fuel consumption rate of the engine and improve the drivability of the engine.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional internal combustion engine fuel injection device, FIG. 2 is a schematic configuration diagram of an internal combustion engine fuel injection device showing another conventional example and an embodiment of the present invention, and FIG. FIG. 4 is a waveform diagram showing the operation of each part, and is a block configuration diagram of a control device showing an embodiment of the present invention. l...Intake air amount sensor, 2...throttle valve, 3...
Fuel injection valve, 4... Internal combustion engine, 5... Control device, 5
5... Multiplier, 56.57... Timer, 59...
Fuel injection valve drive circuit, 6... Intake pipe, 7... Acceleration detector. Agent Shin Kuzuno - Figure 3 (c) P. Procedural amendment (spontaneous) Commissioner of the Japan Patent Office 1, Indication of the case Japanese Patent Application No. 115947/1982 2
, Name of the invention Internal combustion engine fuel injection device 3, Person who makes the correction'! Heji 5, Detailed explanation of the invention in the specification subject to amendment 6, Contents of the amendment (1) Page 5 of the specification, lines 4-5 [It would be better to make the Jt-r smaller.” I am corrected. (2) Lines 7-8 of the same page “independently, instead” wo “independently”
I am corrected. that's all

Claims (1)

[Claims] +I+ A control device that controls the opening time of the fuel injection valve with a full-open valve pulse according to control contents programmed in advance based on various operating parameters including the intake air amount and temperature of the fuel injection valve and the engine, and the transient state of the engine. In an internal combustion engine fuel injection device equipped with an acceleration detection means for detecting a state, 1
A valve opening pulse generating means for fuel increase is provided independently of the valve opening pulse generating means for injecting the basic fuel amount during steady state, and the valve opening pulse width for fuel increasing is set as described above independently of the basic fuel amount. An internal combustion engine fuel injection device characterized by being made to depend on engine water temperature.