JPS60249649A - Fuel feed controller for internal-combustion engine - Google Patents

Abstract

PURPOSE:To permit the correct fuel control by an inexpensive discharge valve by continuously opening/closing-controlling a control valve for a fuel discharge valve on the basis of the output signal of a fuel flow-rate detector installed in the vicinity of said control valve, thus obviating he necessity of a discharge valve required for the high-speed operation with high accuracy. CONSTITUTION:During the operation of an internal-combustion engine 6, the supplied fuel flow-rate Qf is calculated on the basis of the output signals Qa, theta, and Te of an intake air amount sensor 1, throttle opening-degree sensor 8, and a water- temperature sensor 9, in the calculation part 71 of a controller 7. Then, the calculated value is compared in the comparison part 73 with the output signal Qf of a fuel flow-rate sensor 13 having the superior high-speed response performance which detects the fuel flow-rate discharged from a fuel discharge control valve 3. Then, an actuator 4 is driven through an amplifying part 74 by the obtained deviation signal DELTAQf, and the opening degree of the fuel discharge control valve 3 is controlled.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a fuel supply control device for an internal combustion engine, and more particularly, to a fuel supply control device for an internal combustion engine of an automobile, which calculates the flow rate of fuel supplied to the internal combustion engine according to its operating parameters. , related to a device that controls the supply of fuel to an internal combustion engine by energizing a fuel injection valve based on the calculation result [Prior art] Conventionally, this type of fuel supply control device has been installed in the intake pipe of an internal combustion engine. The pressure of the fuel supplied to the provided fuel injection solenoid valve is kept constant by a fuel pressure a+1 regulating valve composed of a diaphragm, and further, while being kept at this constant pressure, the opening time of the injector is There is a device that controls the supply of fuel according to the operating parameter VC of the engine by adjusting the discharged fuel flow according to the length. In such a device, the pressure adjustment accuracy of the fuel pressure adjustment valve and the reproducibility of the opening/closing operation of the fuel injection solenoid valve directly affect the control accuracy of the amount of fuel supplied to the engine. A high degree of accuracy is required, and the fuel injection valve described above requires advanced mechanical engineering and production technology, and sufficient reproducibility and reliability must be guaranteed for long-term use. However, it has the disadvantage of being expensive for mass-produced items such as automobiles.

[Summary of the invention]

This invention includes a fuel discharge valve that can continuously control the discharged fuel flow rate according to an input electrical signal, and a twister flow rate sensor that is provided immediately upstream or downstream of the fuel discharge valve and detects the discharged fuel flow rate. The discharge control of the fuel flow rate to be supplied to the engine is carried out based on the output signal of the total fuel flow rate detector, thereby eliminating the above drawbacks and at the same time improving the accuracy of the ratio of the air flow rate to the fuel flow rate. An object of the present invention is to provide an engine fuel supply control device that can be well controlled.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

In Fig. 1, (11 is an air amount sensor that generates an electrical signal, such as a frequency signal or a DC voltage signal, depending on the amount of air taken into the intake pipe (2), and (3) is a sensor that continuously discharges fuel. The fuel discharge control valve is configured such that the opening area of the opening (3a) monotonically increases or decreases with respect to the vertical movement of the needle valve (8b). (4)
is the fuel discharge R1hgl valve + 31 needle valve (8b
) T - An actuator for vertical movement, consisting of a force smoke that generates a linear axial force in response to the supplied DC current. (5) is a throttle valve provided in the intake pipe, which adjusts the flow rate of the air-fuel mixture.

(6) is an internal combustion engine driven by igniting and exploding the air-fuel mixture; (7) is the fuel discharge control valve (3);
A control device that fully controls the operation of the actuator (4) and adjusts the fuel discharge amount from the fuel discharge control valve (3) to an optimum value VC in accordance with the bad VC of the internal combustion engine (6). It is something. (8) is a throttle opening sensor that measures the entire opening of the throttle valve (5); [9H- is a water temperature sensor that measures the entire cooling water temperature of the internal combustion engine (6); (10)
ri A fuel pressure regulator that adjusts the pressure of the fuel supplied to the fuel discharge control valve fil to a predetermined value; (11) is a fuel pump that is a fuel pumping device that supplies the fuel in the fuel tank U to the fuel discharge control valve (3); ).

t14 is a fuel flow sensor that continuously detects the flow rate of fuel supplied to the fuel discharge control valve (31) and the internal combustion engine (6) and generates an electric signal according to the flow rate. The most suitable sensor is a heat-sensitive type with excellent high-speed response.

In addition, the control device (7) ri is connected to the air volume sensor il+
, a calculation section υ that calculates the fuel flow rate to be supplied to the engine (6) based on information from the throttle opening sensor (8) and the water temperature sensor (9), and a calculation procedure and method for the above calculations. a program σ4 that commands the calculation unit συ, a comparator unit that compares the output signal obtained by the arithmetic unit συ with the signal output from the fuel flow rate sensor 04, and a comparator unit that compares the output signal of the comparator unit C4, and The actuator (4) is composed of an amplifying section (c) that outputs all the electric signals to operate the actuator (4).

The operation of the above configuration will be explained.

Figure 2 fal is an output signal obtained from the air amount sensor fi+, and a DC voltage is generated with respect to the intake air amount to the internal combustion engine (6).
For example, a vane type flow meter installed in the intake pipe (2) and moved by the force of the intake air flow is used as 1, and after detecting the movement of the vane with an electric position sensor, a suitable linear,
It is possible to obtain it by performing Rise Gold.

fjg diagram (bl is the desired intake air amount signal Q8, throttle opening θ and engine coolant QTe as input information,
This figure shows the supplied fuel flow rate Qf calculated by the calculation unit συ, and shows the change on the same time axis corresponding to the intake air flow rate Qa.

Where the intake air flow rate changes rapidly with the passage of time, the ratio fic term of the supplied fuel flow rate to the intake air flow rate is adjusted transiently to achieve the desired air-fuel ratio t according to the operating state of the engine. Qfk is calculated so that An output word (') of the fuel flow sensor is input to another input of the comparison section (73), and its deviation signal ΔQ
A detailed block diagram of the amplification fliH74 is shown in FIG. 8, and the entire previous work will be explained with reference to this figure.

The above deviation signal ΔQf is from P Controller (741)
control input, and the so-called P, work, and D operations known in the field of automatic control are applied to the deviation signals ΔQ and f.
A signal is output. This signal is converted into a current by current conversion @ ('14 B) to fully drive the actuator (4). The actuator (4) generates a superimposition of the above current and the alternating current from the oscillator (74B).
The needle valve (
8b) is moved up and down to change the passage area A of the opening (3a). Note that the alternating current is superimposed by the needle valve (8b).
To smooth the movement and facilitate high-speed response operation,
The needle valve b) is constantly vibrated slightly. Of course, the frequency of the superimposed alternating current needs to be set to a sufficiently high frequency side as well as the natural frequency of the movable system including the needle valve.

As a result of the above operation, the time change of the passage area A is shown in Fig. 2 (0) on the same time axis as the time change of Qa, Qf indicated by tllLl (Ill) in the same figure. In response to the change in the opening area A of the fuel discharge control valve +31, a slight delay n (fuel flow rate sensor (13) and comparison section p31. The sum of the signal delay and the operation delay of the needle valve (3b)) The fuel flow rate equal to Qf is discharged into the intake pipe through the opening (8a) of the fuel discharge valve (3). From P, the controller (741) is configured to generate a signal that has undergone optimal P, machining, and D operations so that the deviation ΔQf is always zero.

Controller (74t) + 7)li from P as above
The change in the aperture area A with respect to the actuator drive current is, for example, as shown in FIG. It would be relatively easy to use a cheap fuel discharge control valve (3), but at the same time,
While increasing high-speed response, it is also possible to improve the accuracy of the discharged fuel flow rate during a transient state change.

In the above embodiment, the fuel flow rate senna field a is provided upstream of the fuel discharge control valve (3), but it goes without saying that even if it is provided downstream, the same operation as described above will be performed. - Even in such cases, high accuracy can be obtained over a long period of time by using a heat-sensitive flow sensor, which has no moving parts and can be easily miniaturized.

Further, in the above embodiment, the control device (7) is configured with a digital calculation section and a comparator section and an analog circuit, but it is also possible to configure everything with an analog type or digital type. .

〔Effect of the invention〕

As described above, according to the present invention, the fuel flow rate supplied to the engine from the fuel discharge control valve is detected by the output of the highly responsive and accurate fuel flow rate detector provided immediately upstream S or downstream of the discharge valve. Since the discharge valve is configured to be controlled by continuously opening and closing the valve based on the signal, there is no need for a discharge valve that requires mechanically high precision and high speed operation.
Further, the pressure of the fuel supplied to the discharge valve is sufficient as long as it is above a predetermined value, and there is no need to accurately adjust the pressure as in the conventional case.

In addition, since fuel can be supplied continuously with high precision, the responsiveness of fuel flow control itself is significantly improved, resulting in an excellent effect of smooth engine operation.
have

[Brief explanation of drawings]

FIG. 1 shows a fuel supply 1 for an internal combustion engine showing an embodiment of the present invention.
tll (I11 device configuration diagram, FIG. 2 is a necessary S operation waveform diagram for explaining the operation of the device shown in FIG. 1, %8 diagram is a block diagram showing details of the amplifier section (741) It is a diagram showing an example of the change characteristic of the opening area of the fuel discharge control valve with respect to the drive current of the actuator. 1ll--1 intake air flow rate detector, (2+--1 intake pipe, +31--1 fuel discharge control valve, +41---Actuator 1 (51---Throttle valve, (6]--Internal combustion engine, +7)---Control device, (81-Throttle R&
Sensor, (91-Water temperature set/su, (ll)--Fuel pump, Q field-m-Fuel flow rate detector. Agent Masuo Odai Figure 2 Figure 4 Procedural amendment (self-motivated) Dear Commissioner of the Japan Patent Office 1 Indication of the case Japanese Patent Application No. 59-Tosh No. 52 2 Name of the invention Fuel supply control device for internal combustion engine 3 Name of the person making the amendment Representative Hitoshi Katayama Department 5 Column for detailed explanation of the invention in the specification subject to amendment 6. Contents of the amendment (1) "Twisting machine" on page 4, line 2 of the specification is corrected to "fuel". (2) (-linear, rise" on page 6, line 19 of the same document is changed to "-linear, rise")
"Linearize". that's all

Claims (1)

[Claims] +11 A fuel discharge control valve that is attached to an intake pipe connected to an internal combustion engine and is capable of continuously changing the fuel discharge flow rate based on an electric signal, and supplies full pressure of fuel to the fuel discharge control valve. Fuel pumping device. a fuel flow rate detector, which is provided in a fuel path from the fuel pressure feeding device to the fuel discharged into the intake pipe via the fuel discharge control valve, and detects a fuel flow rate passing through the fuel discharge control valve; A calculation device that calculates the total flow rate of fuel supplied to the engine according to the operating parameters of the engine, and a calculation result of the calculation device and the output signal of the fuel flow rate detector, and a calculation result of the calculation and the output signal. 1. A fuel supply control device for an internal combustion engine, comprising a control circuit that generates an electric signal for operating the fuel discharge control valve so that the fuel discharge control valves coincide with each other. (21) The fuel discharge control valve is characterized in that the fuel discharge control valve has monotony such that the fuel discharge at one point corresponds to an arbitrary input electric signal. A fuel supply control device for an internal combustion engine. (3) A patent claim characterized in that the fuel discharge control valve is opened and closed in response to an input electric signal so that its passage area continuously changes. A fuel supply control device for an internal combustion engine according to item 11 or item (2).