JPS58214642A - Fuel control device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To control the air-fuel ratio with high precision by storing data to determine the supply amount of fuel on the basis of the suction pipe negative pressure and the number of revolutions of an internal-combustion engine in a table of a memory. CONSTITUTION:Combustion air is sucked via an air cleaner 102 and a throttle valve 104. Fuel is supplied via an electromagnetic injection valve 105. A part of exhaust gas is returned via an exhaust branch pipe 109, an EGR valve 110, and an EGR introduction pipe 111. An EGR control unit 114 controls the negative feedback of the EGR valve 110. A fuel control unit 108 takes output signals of a pressure sensor 106, an ignition coil 107, and the like as its inputs to operate the electromagnetic injection valve 105. In the fuel control unit 108, data to determine the supply amount of fuel in accordance with a suction pipe negative pressure and the number of revolutions are stored. This construction permits to control the air-fuel ratio with high precision even in the case of EGR.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention electrically controls the amount of fuel supplied to an internal combustion engine, in which data for determining the amount of fuel supplied to the internal combustion engine is determined based on the intake pipe pressure and rotational speed of the internal combustion engine. The present invention relates to a fuel control device for an internal combustion engine that controls a fuel supply amount based on data stored in a memory in advance for each operating state determined by the above, and read out in response to each operating state.

When electrically controlling the amount of fuel supplied to an internal combustion engine, the intake air line of the internal combustion engine is detected, and the intake air line is detected.
It is necessary to supply fuel at a ratio of 9r>'rl.

One method for detecting the intake air amount of an internal combustion engine is to calculate the intake air amount based on the intake pipe pressure and rotational speed of the internal combustion engine.

In this case, if a method is used to recirculate part of the exhaust gas to the intake side (hereinafter referred to as EGR) as one of the exhaust gas countermeasures, the internal combustion engine will not only inhale fresh air but also exhaust scum. become. Since this exhaust gas does not participate in combustion, it is necessary to supply fuel at a ratio of P9 to the intake air amount of fresh air, which is obtained by subtracting the above exhaust gas amount from the intake air amount of the internal combustion engine.

However, when the intake air amount is calculated using the intake pipe pressure and rotational speed as described above, the exhaust gas amount of the upper 6-EGH is also included in the calculation. Calculate the above fresh air intake air line t
Alternatively, there is a method of subtracting the above EGR exhaust gas amount by 81 from the intake air amount calculated from the intake pipe pressure and rotational speed. For example, the EGR exhaust gas h↓ is calculated from the moving type of the EGR valve that controls the E()R exhaust gas salt.

However, it is difficult to accurately calculate the exhaust gas amount of the J70H because the difference in the amount of exhaust gas caused by the EC)R valve is approximately one month or so. Therefore, it is difficult to precisely match the fuel supply amount to the fresh air intake air supply, and there is a problem in that it is not possible to precisely adjust the air-fuel ratio to a desired air-fuel ratio.

The present invention has been made in order to solve the following drawbacks, and the present invention is based on data that determines the fuel supply amount when IIIR is not applied to the internal combustion engine, in correspondence with the intake pipe pressure and rotational speed of the internal combustion engine. Furthermore, the data for determining the fuel supply amount when the internal combustion engine is also ORed by 1 is stored in the memory table corresponding to the intake pipe pressure and rotation speed of the internal combustion engine. Corresponding to the opening/closing status of the gar+valve of the internal combustion engine, the table 2 is selected, and the fuel supply to the internal combustion engine is controlled based on the data of the selected table, thereby multiplying the The object of the present invention is to provide a device that can achieve high accuracy even in the case of electric, air, and fuel.

The invention will now be described with reference to a real IML example.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, in which an internal combustion engine (101) is a known four-stroke spark ignition internal combustion engine mounted on an automobile, and combustion air is transferred to an air cleaner (102).
), intake pipe (108), throttle valve (104)
) and then inhaled. Further, fuel is supplied from a fuel system (not shown) through an electromagnetic injection valve (105) provided upstream of a throttle valve (104) in an intake pipe (108). On the downstream side of the throttle valve of the intake pipe (108),
A pressure sensor (106) is provided to detect the absolute pressure in the intake pipe (108) and convert it into voltage. The ignition coil (107) supplies high voltage to a spark plug (not shown) provided for each cylinder of the internal combustion engine f101).

The fuel control device (108) includes a pressure sensor (106),
An output signal from an ignition coil (107) or the like is input to drive an electromagnetic injection valve (105).

A part of the exhaust gas branched to the exhaust branch pipe (109) connected to the exhaust pipe (115) passes through the EGR valve (110) and then passes through the throttle valve (104) of the intake pipe (108).
The EGR introduction pipe (111) connected to the downstream side of the engine is used to recirculate the internal combustion engine (1ol).

A position sensor (118) that detects the position of the EGR valve and converts it into voltage is connected to the Fi()R valve (110).

The FiGR control device (tt4) is a pressure sensor (106)
, ignition coil (107), ()7 sensor (11)
8) etc. as input, and force motor (112
), and the EG
Negative feedback control is performed to match the positions of the R valves (110).

FIG. 2 is a diagram showing the configuration of the F, GR control device (114), in which the IuGR calculator (201) converts the output of the pressure sensor (106) and the negative side signal of the ignition coil (107) into the comparator (2).
02), the output of the position sensor (1'18), etc. is input, and the intake pipe (10
6) Predetermined EG according to pressure and rotation speed
A control amount corresponding to the deviation between the target position and the position of the FiGR valve (110) is applied to the control layer corresponding to the h+1 position of the R valve (110). A control signal corresponding to this is output to the driver (208). The driver (208) controls the drive current of the force motor (112) in response to the output of the EGR calculator (201), and controls the opening of the EGR valve (110) to match the target position. The comparator (204) outputs rHJ when the output of the position sensor (118) is above a predetermined value, and outputs "L" when the output is less than the predetermined value.

FIG. 8 is a diagram showing the configuration of the fuel f4 control device (108), in which the pulse width calculator (801) is connected to the pressure sensor (106).
A numerical value obtained by p-converting the output of , using an A/D converter (802).

The negative side signal of the ignition coil (107) is waveform-shaped and converted into a logic level, and the output is converted to voltage by an f//'v converter (804), and further converted by an A/D converter (805). The internal combustion engine (10
1) The driving time of the electromagnetic injection valve (105) is calculated according to the operating state. The timer (807) is connected to the oscillator (80
6) is used as the basic pulse, and when the trigger signal is output from the comparator caoa) in synchronization with the engine ignition timing, the output of this timer (+307) is set to rHJ and sent to the town counter (not shown) provided internally. Pulse width calculator (80
1) The value set in the down counter is set for each output pulse of the oscillator (806) and the value set in the down counter is turned down to 1-L, and when the timer reaches 1L, the output of this timer is set to 1L. The driver (1108) is configured so that the output of the timer (807) is "I("σ month υI Ill).
105) Drive e.

Figure 4 shows the configuration of the pulse width calculator (801), and the function generator (401) includes 17 Gl”t valves (110
) is open less than a predetermined value (hereinafter referred to as EOR off), the intake air % l' (toa) of the internal combustion engine (101)
Corresponds to multiple operating states of the engine that are divided two-dimensionally according to the pressure and rotation speed of the engine] -7 fuel supply amount, that is, the numerical value that determines the operating time of the electromagnetic injection valve (105) is built-in. is stored in the read-only memory of the A/
The outputs of the D converters (802) and (1105) select the corresponding data stored in the read-only memory and output to the data selector (408).

, J function generation + a (402) K l;j, EGR valve (
A plurality of operating states of the internal combustion engine (101) divided two-dimensionally according to the pressure and rotational speed of the intake air ↑ji (108) of the internal combustion engine (101) when the internal combustion engine (101) is open to a predetermined value or more (hereinafter referred to as EGR ON) The fuel supply amount corresponding to the function generator (4), that is, the numerical value that determines the driving time of the electromagnetic injection valve (105), is stored in the built-in read-only memory in the form of a table.
01), A/D converters (802), (805
), the corresponding data stored in the read-only memory is selected and output to the data selector (408). When the output signal of the comparator (204) of the EGR control device (114) is rHJ, that is, KGB on, the data selector (408) sets the output of the function generator (402) to "L", that is, EC)R off. In this case, the output of the function generator (401) is output to the timer (807).

Here, when the output of the comparator (204) is "L", when the KGR of the internal combustion engine (101) is off, the data output from the function generator (401) is used to control the electromagnetic injection valve (105).
) is determined, and the output of the comparator (204) is rH.
In the case of J, that is, when the EGR of the internal combustion engine (101) is on, the data output from the function generator (,402) =
Determine the driving time of the A-type injection valve (105).

In this embodiment, numerical values corresponding to the driving time of the electromagnetic injection valve (105) corresponding to KO, R on, and off are stored in the built-in read-only memory of the N number generators (401) and (402) in a table. function generator (401) and (4
The data output from the function generator (40
2) Divide the numerical value stored in the table built in the function generator (401) by the numerical value stored in the table built in the function generator (401).
Function generator A stores the commercial coefficient of drive time by GR) in the built-in read-only memory in accordance with the pressure and rotational speed of -1-intake %l (10B) as shown in table 11.
The function generator (401) is used to determine the drive time of the electromagnetic injection valve (105) using the data output from the function generator (4111) when the EGR is off, and when the FGR is on. , how to output to the function generator and the function generator (401
) may be used to calculate the numerical value corresponding to the driving time of the electromagnetic injection valve (105) when pmGn is on, and determine the driving time of the electromagnetic injection valve (105). . That is, it is also possible to select one or two of the 92 types of data that indicate whether KGlt is on or off. Also, B.C.
The coefficient corresponding to the filling efficiency at the intake pipe pressure and rotational speed of the internal combustion engine (101) when the GR is off is calculated using the intake pipe (101).
Function generator B stored in the built-in read-only memory in the form of a table corresponding to the pressure and rotation speed of B) and KGB
The intake air amount of the internal combustion engine (101) when it is on and the EGR
Function generation g that stores a coefficient corresponding to the ratio of intake air amount when off in the built-in read-only memory in the form of a chiffle.
C is provided, and when EGR is off, the electromagnetic injection valve (105) is If EGR is on, the output of function generator B, the output of A/D converter (802) and function generator C are determined.
By multiplying the output of
05) may be determined.

-It is a function generator that stores the coefficient corresponding to the filling efficiency when EjGR is on or off, and stores it in the form of a table in E. Select one of the coefficients you are trying to remember, and select A
Multiplying the output of the /D converter (802) by the above coefficient,
Alternatively, the driving time of the magnetic injection control valve (105) may be determined.

As described above, according to the present invention, the first theta that determines the amount of fuel supplied to the internal combustion engine when EGR is off, and E (the amount of fuel supplied to the internal combustion engine when IR is on) are used. Memorize the data of ``2'' in memory by mouth.It, depending on the state of TtiGR, select the data of To clarify, even when EGR is on, there is an effect of being able to control the electric air-fuel ratio. The data that determines the storage of the engine II corresponds to the engine side It in the case of It corresponds to each operating state of the internal combustion engine.Since it is stored in the memory, the valley operation i [i
Even if the EGR rate fluctuates between states, the fuel intake amount can be set by matching the EGR amount in each operating state, so the fresh air intake amount can be adjusted even when the BGR amount fluctuates. This has the effect of allowing the fuel supply amount to be set in a desired relationship and allowing accurate air-fuel ratio control.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The configuration diagram of the KGR control device (114) shown in Fig. 8 is shown in Fig. 1.
FIG. 4 is a block diagram of the fuel control system m(log) shown in FIG. 8, and FIG. 4 is a block diagram of the pulse width calculator (801) of FIG. (101)...Internal combustion engine, (102)...Air cleaner, (108)...Intake! ', (104)...throttle valve, (105)...electromagnetic injection valve, (1
06)...Pressure sensor, (107)...Ignition coil, (108)...Fuel control device, (109)...Exhaust branch pipe, (110)...EGR valve, (111)
... EGR introduction pipe, (112) ... Force motor, (tta) ... Position sensor, (114) ... BG
R control device, (201)...EGR calculator, (202
), (204), (808)... comparator, (20
8λ (208)...Driver, (801)...Pulse width calculator, (802), (805)...A converter, (804)・f/'V converter, (806)・・・・
Oscillator, (807)...Timer, (401), (4
02)...Function generator, (408)...Data selector In each figure, the same part is indicated by the same symbol. Agent Shin Kuzuno −

Claims (1)

[Scope of Claims] An exhaust gas rapid flow control valve that controls a storm that recirculates part of the exhaust gas of an internal combustion engine to the intake system, a pressure detection means that detects the pressure of the intake pipe of the internal combustion engine, and a simultaneous rotation of the internal combustion engine. and a fuel control means for controlling the amount of fuel supplied to the internal combustion engine based on the detection information of each detection means, wherein the fuel control means controls the exhaust gas recirculation control. The first data for determining the amount of fuel supplied when the valve is in the operating state and the non-operating state, and the second data are preliminarily determined based on the intake negative pressure and rotation speed of the internal boat engine. Memory data corresponding to a plurality of operating states of the internal combustion engine divided two-dimensionally is stored, and stored data corresponding to the plurality of operating states is read out based on each detection information of the pressure detecting means and the rotation speed detecting means. A fuel control device for an internal combustion engine, comprising memory means for determining whether the exhaust gas recirculation control valve is in an activated state or a non-actuated state, and means for selectively selecting the first and second data based on the output of this determination. . (2) The means for determining whether the exhaust gas recirculation control valve σ11 is activated or not is by detecting the amount of valve movement of the exhaust gas recirculation control valve (
- A four-fuel ratio φ11 device for an internal combustion engine according to claim 1, comprising a valve movement amount detecting means for determining the operation and non-operation 1111J based on the magnitude relationship of the detected value with respect to the set value.