JP4074350B2 - Electronic controller for fuel metering in internal combustion engines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention forms a control signal for the fuel metering device based on signals of operating characteristic quantities such as the number of revolutions, the amount of air passing through the intake pipe and the temperature, and is required at the time of starting, after starting, or during warm-up operation. The present invention relates to an electronic control unit for fuel metering in an internal combustion engine, which is arranged to reduce enrichment of the air / fuel mixture according to a selectable function during an increased operating phase of the fuel.
[0002]
[Prior art]
German Offenlegungsschrift 25 22 283 discloses a device for enrichment at start-up and / or after start-up of a fuel / air mixture supplied to an internal combustion engine. According to FIG. 2 of the above patent, the after-starting thickening coefficient is linearly reduced and adjusted on the time axis. In addition, the total duration of the reduction adjustment is dependent on the rotational speed and the load, taking into account the desired matching of the ratios for the various operating quantities in the internal combustion engine.
[0003]
German Offenlegungsschrift 2511974 relates to a method and device for cold start operation in a fuel injection device. There, a reduction adjustment of the enrichment at start-up is performed with respect to the rotational speed of the internal combustion engine.
[0004]
Further, German Patent Application No. 43088113 (WO94 / 21909) shows a fuel metering control system for an internal combustion engine having the following uniqueness. That is, in this case, when a predetermined number of ignitions have occurred since the start of the start, or when the sum of the air mass or the amount of air sucked after the start reaches a predetermined value, the lambda control is controlled by the open loop control. Switch from mode to closed loop control mode. The basic idea in this case is to perform switching when a predetermined energy metabolism (work accomplished) has occurred in the internal combustion engine since the start (claim 3). In addition, in the above specification, reference is also made to making the reduction adjustment of the warm-up enrichment factor in relation to the transition to the closed-loop control mode dependent on time and / or ignition in terms of lamp characteristics. Yes.
[0005]
[Problems to be solved by the invention]
The object of the present invention is to further optimize existing systems.
[0006]
[Means for Solving the Problems]
According to the invention, this problem is solved by the fact that the individual reduction adjustment factor of the function for the enrichment reduction depends in each case on the current integrated value of the amount of air supplied to the internal combustion engine.
[0007]
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a schematic view of an internal combustion engine 10 together with an important influence amount within the framework of the present invention. The internal combustion engine 10 includes an intake pipe 12 in addition to the exhaust gas pipe 11, and an air amount sensor 13, a throttle valve 14, and an injection valve 15 are arranged in the intake pipe. Further, the control device 16 receives at least a signal from the air amount sensor 13 and a rotation speed signal on the input side 17 and a temperature signal on the input side 18 as input signals. Then, the control device 16 supplies a signal from the output side to at least one injection valve 15 of the internal combustion engine and the ignition device which are shown. The role of the known arrangement shown in FIG. 1 is to optimize the operation of the internal combustion engine 10 with respect to fuel metering and ignition via the injection valve 15 depending on the individual operating characteristic quantities of the internal combustion engine. That is. This includes a predetermined starting enrichment at start-up and a reduction in enrichment in the time phase after start-up, which are performed according to a function that is as precisely as possible matched to the requirements of the internal combustion engine.
[0009]
As described at the beginning with respect to the prior art process, various attempts are known to reduce the thickening factor after start-up. In particular, the reduction adjustment on the time axis and the reduction adjustment with respect to the rotational speed can be mentioned.
[0010]
According to the invention, the reduction adjustment is selected as a function of the integrated value of the intake air amount. This is illustrated by the schematic graph in FIG. In this figure, the enrichment factor for the fuel / air ratio is shown on the time axis, in which case only the post-start time phase following start-up is important in special cases. In the time phase after starting, the enrichment coefficient is reduced as a function of the integral value of the intake air amount, that is, the reduction adjustment coefficient depends on ∫Q _Ldt starting from the start end time or the time phase starting time after the post start.
[0011]
This is done by the corresponding program steps in the control device 16 of FIG. 1 using the signal from the air quantity sensor 13.
[0012]
Depending on the individual case, it may also be advantageous to set the start of integration at the start of start or the start of warm-up.
[0013]
In this case, it is possible to realize various reduction adjustment functions corresponding to a desired start-up operation, post-start operation, or warm-up operation based on the sum signal of the integral values.
[Brief description of the drawings]
FIG. 1 is an overview of internal combustion engine control along with important influence quantities within the framework of the present invention. FIG. 2 shows that the figure is clear from this figure.
FIG. 2 is a graph showing that the reduction adjustment of the enrichment coefficient during the time phase after the start of the internal combustion engine depends on the integrated value of the sucked air amount.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Internal combustion engine 11 Exhaust gas pipe 12 Intake pipe 13 Air quantity sensor 14 Throttle valve 15 Injection valve 16 Control apparatus

Claims (3)

A control signal for the fuel metering device is formed on the basis of signals of operating characteristics such as the rotational speed, the amount of air passing through the intake pipe and the temperature, and the required fuel can be increased at the time of starting, after starting, or during warm-up operation. In an electronic control unit for fuel metering in an internal combustion engine configured to reduce enrichment of the air / fuel mixture according to a selectable function during a different operating time phase,
An electronic control unit for fuel metering, characterized in that the individual reduction factor of the function depends in each case on the current integrated value of the amount of air supplied to the internal combustion engine. The electronic control unit according to claim 1, wherein the integral value for reducing the concentration is formed after at least one of an amount of start, end of start or after start, or warm-up operation is detected. 3. The electronic control unit according to claim 1, wherein different enrichment factors or reduction adjustment factors are formed based on an integral value for at least one individual region of the amount of start-up, after-startup or warm-up operation.

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