JP3980669B2 - Internal combustion engine control method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control method and apparatus for an internal combustion engine provided with a fuel pump.
[0002]
[Prior art]
Such a method and apparatus for controlling an internal combustion engine is known, for example, from US Pat. No. 3,470,854. Again, a control method for an internal combustion engine equipped with a fuel pump is described. In the case of the described method, the fuel pump is shut off when the rotational speed is below the threshold value.
[0003]
[Problems to be solved by the invention]
It is an object of the present invention to realize a method and an apparatus for controlling an internal combustion engine of the type described at the outset, so that the fuel pump can be turned on as quickly as possible, and thus the pressure can be generated more quickly with a short engine start time. Furthermore, the fuel pump is prevented from being turned on by a failure signal.
[0004]
[Means and advantages for solving the problems]
According to the present invention, the problem is that the first voltage value and the second voltage value are measured at two successive time points, and the difference between the first voltage value and the second voltage value is a threshold value. It is checked whether or not the rotation value is within an allowable range, and if these two conditions are satisfied, the fuel pump is operated and the first voltage value is supplied to the starter. measured before feeding, the second voltage value is the first speed signal is solved by Rukoto be measured or after a predetermined lapse of time when occurred.
[0005]
According to the present invention, the time for forming the fuel pressure can be reduced by evaluating the supply voltage. At the same time, erroneous fuel pump input due to fault signals is avoided.
[0006]
Advantageous embodiments of the invention are indicated in the dependent claims.
[0007]
Next, embodiments of the present invention will be described with reference to the drawings.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Fuel is metered into the internal combustion engine 100 via a fuel metering device 105. The fuel pump 110 delivers fuel from the storage container 115 and supplies it to the fuel metering instrument 105. A control signal is applied from the control device 120 to the fuel metering device 105 and the fuel pump 110.
[0009]
The power supply voltage U _bat is preferably applied from the battery 130 to the control device 120. Further, the battery 130 is connected to the starter 140 via the switching means 135. The generator 145 provided in the internal combustion engine 100 is scanned by a sensor 150, which in turn supplies a corresponding signal N to the control device.
[0010]
This device operates as follows. When the driver operates the switching unit 135, a voltage is applied to the starter 140. The starter 140 drives the internal combustion engine 100, which starts the internal combustion engine. The generator 145 is also rotated by the rotation of the internal combustion engine 100, and the sensor 150 captures and detects the rotation speed signal N generated at that time and transfers it to the control device 120.
[0011]
The operating characteristic amount is captured and detected by various sensors not shown. Based on these operating characteristic amounts, the control device 120 calculates a signal for determining the amount of fuel to be injected for supplying to the fuel metering device. Further, the control device 120 supplies a signal to the fuel pump 110 so that the fuel is sent from the storage container 115 by the fuel pump 110.
[0012]
In FIG. 2, the output signal of the sensor 150 is written in the first column, and the power supply voltage U _bat is written in the second column with respect to time t. Shortly after time t ₀ , the switching means 135 is closed and the starter is operated. As a result, the supply voltage U _bat drops significantly. At time t _1, the first negative side edges of the output signal of the sensor 150 occurs. At time t _2, the next negative side edges of the output signal of the sensor 150 occurs. The same applies to time t ₃ .
[0013]
According to the present invention, the procedure as shown in FIG. 3 is taken. In the first step 300, the supply voltage U _bat is measured at time t ₀ . In step 310, the switching means 135 is closed. As the switching means 135 is closed, a current is supplied to the starter 140.
[0014]
When the starter current has not yet exerted any effect on the supply voltage, the first value U (t ₀ ) needs to be measured. The value (t ₀ ) of the supply voltage U _bat at the time point t ₀ is stored.
[0015]
In step 320, a second value U (t ₁ ) of the supply voltage is captured at a later time. Time t ₁ is preferably the time when the first negative side edge of the output signal N of sensor 150 occurs. Next, in step 330, the difference ΔU = U (t ₁ ) −U (t ₀ ) is determined.
[0016]
If it is detected in the interrogation step 340 that the absolute value of the difference ΔU is larger than the threshold value US, an electric current is supplied to the fuel pump 110 in step 350. If it is not greater than the threshold US, step 360 continues. In this step, the occurrence time t ₂ of the second negative side edge of the signal N is captured and detected.
[0017]
Subsequently, at step 370, a time point t3 when the _third negative side edge of the rotation speed signal N occurs is detected. In step 380, the first rotation value N ₁ and the second rotation value N ₂ are calculated as a function of time points t ₁ and t ₂ or time points t ₂ and t ₃ . Next, in a query step 390, it is checked whether the average value (N ₁ + N ₂ ) / 2 of both these rotational values is between the minimum value N _min and the maximum value N _max . If it is between the minimum and maximum values, current is also supplied to the fuel pump at step 350. This interrogation step checks whether the evaluated signal is actually a rotational speed pulse. When a fault pulse occurs, the average rotation value is outside the allowable range defined by the minimum value N _min and the maximum value N _max .
[0018]
It is particularly advantageous to determine the _first rotation value N ₁ already after step 360 and to check in question step 390 whether this value is within an acceptable range.
[0019]
In step 400 if the failure pulse occurs, wait for the next pulse of the rotational speed signal arrives, the pulse occurs at time t _4. The value at time t ₂ is used instead of the value for time t _1, and the value at time t ₃ is used instead of the value for time t ₂ . Time t ₄ enters the position of time t ₃ . Next, at step 380, two rotation numerical values N ₁ and N ₂ are newly calculated based on the time points t ₂ , t ₃ and t ₄ .
[0020]
By supplying the current to the fuel pump 110 when one of both conditions for the supply voltage or the rotational speed is satisfied, the current can be supplied to the fuel pump 110 at a very early point. By evaluating the rotation speed average value, it is possible to reliably eliminate erroneous current supply caused by the fault signal.
[0021]
As an alternative, it can also be arranged such that the positive side edges of the output signal N of the sensor 150 are evaluated accordingly.
[0022]
Further, in step 320, the voltage may be captured and detected after a predetermined time, rather than when the first negative side edge occurs.
[0023]
It is particularly advantageous to check whether the voltage condition is fulfilled, or optionally it is particularly advantageous to check whether the voltage condition is fulfilled and the rotational value is within an acceptable range. is there. The fuel pump 110 is activated when one of these conditions is met.
[Brief description of the drawings]
FIG. 1 is a schematic view of an apparatus according to the present invention.
FIG. 2 shows various signals shown with respect to time.
FIG. 3 is a flowchart of an embodiment of a method according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Internal combustion engine 105 Fuel metering apparatus 110 Fuel pump 115 Fuel storage container 120 Control apparatus 130 Battery 140 Starter 145 Generator 150 Sensor

Claims (4)

In a control method of an internal combustion engine provided with a fuel pump (110),
Measuring the first voltage value and the second voltage value at two successive time points;
Check whether the difference between the first voltage value and the second voltage value exceeds a threshold value, and whether the rotation value is within an allowable range,
If these two conditions are satisfied, the fuel pump (110) is operated ,
Said first voltage value measured before current power supply to the starter (140), the second voltage value, that you measured or after a predetermined period of time when the first speed signal is generated Features
A method for controlling an internal combustion engine.   The method of claim 1, wherein the fuel pump is operated if at least one revolution value or an average value of at least two revolution values is between a minimum value and a maximum value. The first voltage value and the second voltage value are measured at two successive time points, and the fuel pump is operated if a difference between the first voltage value and the second voltage value is greater than a threshold value. The method according to 1 or 2. In a control device for an internal combustion engine provided with a fuel pump (110),
Measuring the first voltage value and the second voltage value at two successive time points;
Check whether the difference between the first voltage value and the second voltage value exceeds a threshold value, and whether the rotation value is within an allowable range,
If these two conditions are satisfied, the fuel pump (110) is operated , the first voltage value is measured before supplying current to the starter (140), and the second voltage value is measured in the first rotation. characterized in that the means you measure is provided or after a predetermined period of time when the number signal is generated,
Control device for internal combustion engine.

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