JPS63208645A - Electronic fuel feed controller for internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electronic fuel supply amount control device for an internal combustion engine, and more particularly to an electronic fuel supply amount control device for an internal combustion engine, which generates a fuel supply amount signal according to operating parameters, and furthermore, Electronic fuel supply for an internal combustion engine equipped with an electronic control device that determines the fuel supply amount error for each work stroke and cylinder from the obtained fluctuation signal and determines the fuel supply amount by superimposing a correction signal for correcting the error on the fuel supply amount signal This invention relates to a quantity control device.

[Prior Art] In an automobile, low-frequency imaging (shaking) often occurs throughout the automobile in a low rotational speed region during idling. This vibration is caused by a deviation between the mechanical energy generated for each working stroke in each cylinder and the mechanical energy for each cylinder and working stroke determined through the camshaft period. . This deviation is caused, for example, by a fuel supply error with respect to the cylinders or by a difference in the efficiency of the cylinders.

This results in torque fluctuations with a fundamental waveform corresponding to the camshaft period, which torque fluctuations cause vibrations about the longitudinal axis of the entire motor vehicle via the suspension.

This phenomenon called "shaking" (hereinafter simply referred to as "vibration")
In reality, this often occurs at the camshaft frequency.

DE 33 36 028 A1 describes a device for suppressing vibrations occurring in motor vehicles. To this end, a signal is first extracted from a segment wheel attached to the crankshaft, and from this signal a fuel supply amount error regarding the cylinders of the internal combustion engine is determined. Vibration can be reduced by varying the amount of fuel being delivered to the cylinder as desired. The amount of fuel supplied to the individual cylinders is adjusted to a common average value. The correction signal required for this purpose must be independent of the average value. The reason why the correction signal is made independent of the average value is to prevent the correction device from affecting the basic quantity control.

[Problems to be Solved by the Invention] In the known device as described above, the amount of fuel supplied to each cylinder is corrected individually, which is complicated and expensive.

The invention aims at providing a device of the type mentioned in point 7, which makes it possible to eliminate vibrations of the type described above in a simpler and cheaper way.

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, a configuration is adopted in which the period of the correction signal for correcting errors and removing vibrations corresponds to the rotation period of the camshaft.

[Function] With this configuration, the amount of fuel supplied to each cylinder is not controlled for each cylinder,
Corrections can be made for all cylinders.

[Example] The present invention will be described in detail below using examples shown in the drawings.

In FIG. 1, reference numeral 10 indicates a crankshaft or camshaft, and reference numeral 11 indicates one of the many teeth mounted on the crankshaft. What is indicated by the reference numeral 12 are two teeth that are closely arranged in front and behind. A sensor 13 detects a rotational speed signal or a rotational fluctuation signal, and is connected to a signal processing device 14 . The output signal of the signal processing device 14 is transmitted to the rotation speed signal generator 15 and the fluctuation signal generator 1.
8. The output signal of the fluctuation signal generator 18 is connected to the maximum value selection circuit 19.
The output signal of is supplied to a signal generator 20. The output signal of the rotational speed signal generator 15 is supplied to a data generator 16,
Furthermore, the signal is also supplied to the signal generator 20 via the lead wire 23. A signal from signal generator 20 is output to amplifier 21 . The phase detection processing circuit indicated by reference numeral 22 is connected to the lead wire 25.
It is connected to the maximum value selection circuit 19 via a lead wire 24, and to an amplifier 21 via a lead wire 24. Referenced 17 are other operating parameters which are input to the data generator 16 to form the fuel supply signal QK. The signal of the data generator 16 and the signal of the amplifier 21 are summed at a summing point 26 to form a corrected fuel supply signal, which is supplied to an actuator 27 . A fuel pump 28 is actuated by means of the actuating device 27 and supplies fuel to the individual combustion chambers of the internal combustion engine via a route 29 .

The operation of the device corresponding to the block circuit diagram in FIG. 1 is explained in the second diagram.
This will be explained in detail using FIGS. 3, 3, and 4. As the crankshaft 10 rotates, pulses are generated at the sensor 13 by teeth 11 or 12 provided on the crankshaft.

A signal processing device designated 14 detects the time between two pulses. Depending on the amount of fuel supplied to the individual cylinders, variations occur in the time that passes between the individual pulses. From this time, a rotational speed signal is generated in the rotational speed signal generator 15. In a fluctuation signal generator 18, which is also supplied with signals from the signal processing device 14, a fluctuation signal indicating the smoothness of the rotation is generated. The method for determining this signal is known from DE 33 86 028 A1 and will not be described in detail here. From the fluctuation signal, the equivalent fuel supply error per working stroke and per cylinder is determined. The example shown in FIG. 2 shows changes in the fuel supply amount (injection amount) for a four-cylinder engine.

Reference numeral 40 refers to the cylinder that is supplied with the maximum amount of fuel. The value indicated by the reference numeral 40 is particularly important.

The maximum value selection circuit indicated by reference numeral 19 in FIG. 1 operates all generators 0 of No. 3 so that the signal of the signal generator 20 takes the minimum value when the fuel supply amount signal reaches the maximum value. It is. The frequency of the signal generator 20, which generates a sine wave signal, a triangular wave signal, or a rectangular wave signal, is varied by the rotational speed n via a lead wire 23. Since vibrations occur in the automobile due to the camshaft frequency, and the automobile vibrates at the camshaft frequency, the signal generator 20 must generate a signal having the camshaft frequency. From the rotational speed n and other parameters, such as the position of the accelerator pedal, the outside temperature, the air pressure, etc., a fuel supply signal QK is generated via a data generator 16. This fuel supply signal is routed to a summing point 26. At the same time, the correction signal SK from the signal generator 20 is introduced to the summing point 26 via the amplifier 21. The output of the addition point 26 is a superimposition of QK and correction signal SK. This signal activates the operating device 27 to control the amount of fuel supplied to the pump 2.

The circuit indicated by numeral 22 changes with the rotation speed! It has a function of minimizing rotation or torque fluctuations according to the a signal, and is used to perform phase detection processing, which will be described later. In automobiles equipped with microprocessor-controlled control devices, phase detection processing is generally implemented by a program.

As already mentioned, the phase of the signal from the signal generator 20 is
Adjustment is made so that the minimum value of the signal from the signal generator 20 and the maximum value of the fuel supply amount overlap. Next, phase detection processing circuit 2
2, the amplitude of the signal from the signal generator 20 changes! l
l] Adjusted to take the minimum value. At this time,
If a change in phase position occurs, equalize to the new phase position and then adjust the amplitude. In principle, this series of steps can be repeated as many times as desired. A correction signal is shown in FIG. 3, and the large deviation shown in FIG. 2 is corrected using this correction signal. It must be noted that the correction signal is independent of the average value, in order not to change the basic supply quantity formed by the fuel supply quantity control device. A correction signal that has a camshaft frequency (period) and is unrelated to the average fuel supply amount is suitable for compensating for errors as described above. FIG. 4 shows changes in the fuel injection amount after correction. As can be seen from the figure, the variation in the amount of fuel supplied to the cylinders is clearly reduced. Due to the simplification of the illustrated device, it is not possible to precisely adjust the amount of fuel in the individual cylinders to an average value. However, by reducing the fluctuations caused by different amounts of fuel in the individual cylinders, the sources of vibration in the motor vehicle are reduced, and with it, the vibrations are also clearly reduced.

[Effects of the Invention] As is clear from the above description, according to the present invention, the period of the correction signal is configured to correspond to the rotation period of the camshaft, and the phase and amplitude of the correction signal are adjusted according to the fuel supply amount. It is possible to compensate for errors, and this has the excellent effect of suppressing vibrations in the vehicle caused by different fuels being supplied to the cylinders.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of the device of the present invention, FIG. 2 is a diagram showing changes over time in the amount of fuel supplied to each cylinder, FIG. 3 is a diagram showing correction signals, and FIG. FIG. 4 is a diagram showing the change over time of the amount of corrected fuel; 13...Sensor 16...Data generator 20
... Signal generator 21 ... Amplifier 22 ... Detection processing device 27 ... Operating device 28 ... Pump FIG, 4

Claims (1)

[Claims] 1) Fuel supply amount signal (QK) according to operating parameters
Further, the fuel supply amount error for each working stroke and cylinder is determined from the fluctuation signal (SQ) determined from the engine rotation speed signal, and a correction signal (SK) for correcting the error is added to the fuel supply amount signal (QK). An electronic fuel supply amount control device for an internal combustion engine equipped with an electronic control device that determines the fuel supply amount by superimposing the fuel supply amount on an internal combustion engine, characterized in that the period of the correction signal corresponds to the rotation period of the camshaft. Control device. 2) The device according to claim 1, wherein the correction signal is independent of the average value of the fuel supply. 3) The device according to claim 2, wherein the correction signal has a sine wave shape, a rectangular wave shape, or a triangular wave shape. 4) The phase of the correction signal is adjusted so that the correction is performed most strongly in the cylinder where the fuel supply amount error is maximum. Device. 5) The device according to claim 4, wherein the amplitude of the phase-adjusted correction signal can be adjusted. 6) The device according to any one of claims 1 to 5, wherein the phase and amplitude of the correction signal are adjusted by repeating the detection process a number of times.