JPH01262337A - Electronically controlled fuel injection equipment of alcohol internal combustion engine - Google Patents

Abstract

PURPOSE:To improve ignition ability of mixed air by a method wherein assistant air is supplied to a fuel injection valve for normal operation at the time of starting an engine at low temperature and fuel injected from a fuel injection valve for starting is heated. CONSTITUTION:A fuel injection valve (b) for normal operation which leads assistant air for atomizing fuel from an assistant air supply source (a) to an injection hole is provided on an inlet port of each cylinder. A fuel injection valve (d) for starting engine equipped with a heating device (c) for sprayed fuel is provided on a collector part of a suction manifold. Units (e), (f) for detecting engine starting status and engine temperature respectively are further provided. Then when engine temperature is lower than the specified level at in engine starting status, the heating device (c) and the fuel injection valve (d) for starting engine are driven, and at the same time a control unit (g) for starting engine at low temperature which supplies assistant air to the fuel injection valve (b) for normal operation is provided. This improves ignition ability of mixed air.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electronically controlled fuel injection device for an alcohol internal combustion engine, and more specifically, to an electronically controlled fuel injection device for an alcohol internal combustion engine. Regarding technology to improve.

<Prior Art> Conventionally, as a technique for improving the startability of an internal combustion engine, for example, as shown in Japanese Utility Model Application Publication No. 57-44967, there has been a technique for starting the engine in an auxiliary intake passage provided by bypassing the intake throttle valve. A starting fuel injection valve and a catalyst are interposed, and when the engine is started, the fuel injected and supplied from the starting fuel injection valve is partially combusted by the catalyst to thermally decompose or completely vaporize the fuel and supply it into the cylinder, There is something that makes it easier to complete a complete explosion.

According to this configuration, even if methanol is used as the fuel, the catalyst decomposes the methanol into hydrogen and carbon monoxide, resulting in extremely high flammability and improved startability.

<Problems to be Solved by the Invention> However, according to the above-mentioned conventional measures to improve startability, it is necessary to provide an auxiliary air passage that bypasses the intake throttle valve, which complicates the structure. A system in which a starting fuel injection valve with excellent atomization characteristics is provided in the collector part of a certain intake manifold is desirable from the viewpoint of structural simplification, and if the starting fuel injection valve is provided in the collector part, then the intake manifold shape There is no risk that it will have a negative impact on the

However, in the case of alcohol internal combustion engines that use alcohol such as methanol or ethanol as fuel, or mix high-concentration alcohol with gasoline, it is necessary to increase the spray angle of the starting fuel injector installed in the collector. Even if the atomization (atomization) characteristics are improved, the atomization of alcohol becomes extremely poor at low temperatures, making it impossible to obtain good starting performance. It has been difficult to ensure sufficient starting performance simply by providing an improved starting fuel injection valve.

In addition, in engines where the alcohol mixture ratio in the fuel changes, if the optimum injection amount according to the alcohol concentration is not supplied at startup, the inappropriate fuel supply may cause the ignition plug to become wet, making it impossible to start. There is also a fear that it will become.

That is, in engines where the alcohol concentration in the fuel changes, it is common to provide a sensor that detects the alcohol concentration in the fuel, and to control the fuel injection amount according to the alcohol concentration detected by this sensor. If the sensor has not been calibrated and the true alcohol concentration has not been detected when the engine is started, an injection amount corresponding to the true alcohol concentration cannot be supplied to the engine. For this reason,
For example, if fuel is controlled in response to an alcohol concentration that is higher than the actual alcohol concentration and more fuel than the required amount is injected at startup, the starting performance will be poor due to the use of alcohol fuel, so there will be too much fuel before a complete explosion occurs. There is a risk that the fuel will be injected and wet the ignition plug, making it impossible to start.On the other hand, if the fuel injection amount at startup is controlled in response to an alcohol concentration lower than the actual alcohol concentration, Since the actual injection amount at startup is smaller than the required amount, a problem arises in that it is difficult to achieve a complete explosion.

The present invention has been made in view of the above-mentioned problems, and it improves the combustibility of the air-fuel mixture during low-temperature starting in an alcohol internal combustion engine that uses alcohol or a mixed fuel of gasoline and alcohol as fuel. The purpose is to improve injection quantity control and - improve the low-temperature startability of alcohol internal combustion engines.

<Means for Solving the Problems> Therefore, the present invention provides an electronically controlled fuel injection device for an alcohol internal combustion engine that uses alcohol or a mixed fuel of gasoline and alcohol as fuel, as shown in FIG. The intake port of each cylinder is equipped with a fuel injection valve for normal operation that is configured to guide assist air for fuel atomization from a supply source to the injection hole, while a starting system is equipped with a heating means to heat the atomized fuel. an engine starting state detecting means for detecting an engine starting state, an engine temperature detecting means for detecting an engine temperature, and an engine starting state detecting means for detecting an engine starting state; When the engine temperature detected by the engine temperature detection means in the starting state is below a predetermined temperature, the heating means and the starting fuel injection valve are driven and controlled, and each normal operation fuel is supplied from the assist air supply source. A low temperature start control means for supplying assist air to the injection valve is provided.

In addition to the above configuration, an alcohol sensor for detecting the alcohol concentration in the fuel is provided, and the fuel injection amount is controlled based on the alcohol concentration in the fuel detected by the alcohol sensor, and the engine starting state is When the calibration of the detection value of the alcohol sensor is not completed in the engine starting state detected by the detection means, the fuel injection amount control corresponding to a predetermined low alcohol concentration is performed with priority over the detection value of the g alcohol sensor. a first starting fuel control means; and when a starting duration time in a fuel control state by the first starting fuel control means exceeds a predetermined time, the first starting fuel control means responds to a predetermined high alcohol concentration by giving priority to the detection value of an alcohol sensor. a second start-up fuel control means that switches to fuel injection control; and a low-temperature start-up control means only when the second start-up fuel control means is activated and when a predetermined high alcohol concentration is detected by the calibration method alcohol sensor. A low temperature start control permitting means for permitting operation is provided.

<Operation> According to this configuration, when the engine is in the engine starting state detected by the engine starting state detecting means and the engine temperature detected by the engine temperature detecting means is below a predetermined temperature, the engine starts from the starting fuel injection valve. The injected fuel is heated and evaporated (vaporized) by a heating means and supplied to the engine, and assist air is supplied to the fuel injection valve during normal operation to promote atomization of the fuel, so the mixture supplied to the engine is The ignitability of alcohol is improved, and the startability of an alcohol internal combustion engine using alcohol or a mixed fuel of gasoline and alcohol as fuel is improved.

In addition, if the alcohol sensor has not been calibrated yet, by first performing fuel control compatible with low alcohol concentration, and then switching to fuel control compatible with high alcohol concentration after the start duration has become longer, excess fuel can be used when starting the engine. In addition, assist air is supplied and the starting fuel injection valve and heater are driven only when a relatively large amount of fuel is injected in response to a high alcohol concentration. This makes it possible to ensure starting performance at times of high alcohol concentration, which worsens the situation.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 2, a multi-cylinder internal combustion engine 1 is provided with a fuel injection valve 4 for normal operation at each port 3 of an intake manifold 2, and a collector section (surge tank) 5 of the intake manifold 2 for use during startup. One fuel injection valve 6 is provided. The starting fuel injection valve 6 is used only during starting operation, and after complete explosion, fuel is supplied only by the normal operation fuel injection valve 4.

In each nozzle hole portion of the fuel injection valve 4 for normal operation,
An assist air nozzle (not shown) is provided to atomize the injected fuel, and by compressing air on the upstream side by an air pump 7 as an assist air supply source and jetting it from the assist air nozzle, It is configured to atomize the spray by colliding the fuel injected from the fuel injection valve 4 during normal operation with the airflow of this assist air.

Additionally, a starting fuel injection valve 6 provided in the collector portion 5
A heater 8 is attached as a heating means for heating and evaporating the spray. As shown in detail in FIGS. 3 and 4, the heater 8 is constructed by stacking PTC heaters 9 in a plurality of stages at predetermined intervals, each having a disk shape and a honeycomb shape in the center. One end of a bracket 11, which also serves as a current supply line for each PTC heater 9, is fixed to an adapter 10 into which a nozzle body 6a of a starting fuel injection valve 6 is fitted and supported, and each PTC is connected to the inner surface of this bracket 11. By connecting the outer circumferential surfaces of the heaters 9, each PTC heater 9 is arranged coaxially and parallel to the nozzle hole of the starting fuel injection valve 6 and electrically connected. For installation, the heater 8 is inserted into the collector part 5 through the hole 5a, and the fuel injected from the starting fuel injection valve 6 adheres to the electrically heated honeycomb part of each PTC heater 9, causing spraying. It is designed to be heated and evaporated (vaporized) and then supplied to the engine 1. Note that power is supplied to each PTC heater 9 through a connector 12 provided on the adapter 10.
It is done through.

The air pump 7 and heater 8 are driven by relays 14 and 15 controlled by the control unit 13.
The relays 14 and 15 are in a state where the power supply line from batch January 7 can be connected when the engine key switch 16 is in the start position. Therefore, engine key switch 1
6 is the start position, and the control unit 1
When relays 14 and 15 are ON controlled by 3,
Heater 8 and air pump 7 are driven. However, as will be described later, the air pump 7 may be operated at times other than when starting to atomize the fuel, so power is supplied even when the engine key switch 16 is in the ignition position.

The fuel injection valve 4 for normal operation and the fuel injection valve 6 for starting are supplied with alcohol mixed fuel (
A fuel made by mixing alcohol such as methanol or ethanol with gasoline) is suctioned and pumped by a fuel pump 19, and the pressure is adjusted to a predetermined pressure by a pressure regulator 20, and the fuel is supplied. Further, an alcohol sensor 21 that detects the alcohol concentration ALC in the fuel based on capacitance or the like is installed downstream of the pressure regulator 20, and the output of this alcohol sensor 21 is input to the control unit 13. be done.

In addition to the detection signal from the alcohol sensor 21, the control unit 13 includes a water temperature sensor as an engine temperature detection means for detecting the start position signal of the engine key switch 16 and the cooling water temperature Tw in the water jacket representing the engine temperature. 22 detection signals and the like are input. The engine key switch 16 corresponds to the engine starting state detection means in this embodiment.

Next, the control unit 13 controls the starting fuel injection valve 6. Control of the air pump 7 and heater 8 will be explained according to the flowchart shown in FIG. Note that the control unit 13 corresponds to the cold start side '4TII means in this embodiment.

In step (indicated as "S" in the figure, the same applies hereinafter), the alcohol concentration ALC in the fuel detected by the alcohol sensor 21 and the predetermined concentration ALCI (for example, low temperature startability deteriorates at about 85% by volume) (concentration).

Here, the alcohol concentration ALC in the fuel is a predetermined concentration AL
If the fuel condition exceeds ALC and deteriorates low-temperature startability, the process proceeds to step 2, and the alcohol concentration A is lower than the predetermined concentration ALC and does not cause problems in low-temperature startability.
If it is LC, proceed to step 10.

In step 10, the air pump 7 is turned off by turning off the relay 14, and in the next step 11, the heater 8 is turned off by turning off the relay 15.
F, and the starting fuel injection valve 6 is turned off to not drive. That is, when the alcohol concentration ALC in the fuel is low, startability can be ensured without atomization of the fuel by assist air or heating of the fuel by the heater 8, so the fuel injection valve 4 for normal operation without air assist can be Fuel is supplied by injection only.

On the other hand, when it is determined in step 1 that the alcohol concentration ALC is high and the startability is deteriorated, the process proceeds to step 2 and it is determined whether or not the engine is currently in a cranking state. The cranking state is determined based on whether or not the engine key switch 16 is at the start position. If the engine key switch 16 is in the cranking state, the process proceeds to step 3. In step 3, the cooling water temperature Tw detected by the water temperature sensor 22 representing the engine temperature and a predetermined temperature Tw (for example, O'
c >, the cooling water temperature Tw is the predetermined temperature Tw.

If the starting performance is deteriorated due to deterioration of fuel atomization, the process proceeds to step 4, and the cooling water temperature Tw is lower than Tw.
When the temperature Tw is higher than the predetermined temperature Tw and the startability can be maintained satisfactorily, the process proceeds to step 10.11 and the same control as described above is performed.

In step 4, it is determined whether the engine 1 has completely exploded or not based on the engine speed, etc., and if it has not yet completely exploded, the process proceeds to step 5. In step 5, relay 1
4 is turned on, power is supplied from the battery 17, the air pump 7 is turned on, and the fuel injection valve 4 for normal operation is turned on.
Assist air is ejected near the nozzle hole to atomize the spray, and in the next step 6, the relay 15 is turned on to supply power from the battery 17, turn on the heater 8, and supply the starting fuel. By opening the injection valve 6, the fuel injected from the starting fuel injection valve 6 is heated and evaporated by the heater 8, and this evaporated (vaporized) fuel with excellent ignitability is supplied to the engine 1. Make it.

In other words, when the engine 1 is not yet completely detonated in an operating state where the alcohol concentration ALC is high and the cooling water temperature Tw is low and the startability of the engine 1 is deteriorated, the fuel is supplied with assist air to improve the startability. In addition to aiming at atomization of
By supplying heated and evaporated fuel from the starting fuel injection valve 6, it is made easier to ignite (and achieve a quick complete explosion).

Further, if it is determined in step 2 that the engine is not in a cranking state, and if it is determined in step 4 that a complete explosion has occurred, the process proceeds to step 7.

In step 7, the cooling water temperature Tw detected by the water temperature sensor 22 is compared with a predetermined temperature Tw2 (for example, about 10°C, Tw,<Tw,), and the cooling water temperature Tw is
is lower than the predetermined temperature Tw, even if it is in a complete explosion state, there is a risk that stable operation will not be achieved due to deterioration of fuel atomization, so proceed to step 8 and turn on the air pump 8 to perform normal operation. Assist air is supplied to the fuel injection valve 4 during operation to atomize the fuel so that stable drivability can be obtained. However, in a complete explosion state, there is no need to supply fuel from the starting fuel injection valve 6, so in the next step 9, the starting fuel injection valve 6 and the heater 8 are turned off to O.
FF.

Further, when it is determined in step 7 that the cooling water temperature Tw is equal to or higher than the predetermined temperature 7w, it is assumed that the atomization of the fuel is at a level that does not cause any problem, so step 10.1
Proceed to step 1, air pump 7, starting fuel injection valve 6. Turn off the heater 8.

In this way, when the alcohol concentration ALC is so high that starting performance cannot be ensured and the water temperature is low, the fuel supplied from the fuel injection valve 4 for normal operation is atomized, and the collector of the intake manifold 2 is By supplying fuel that has been heated and evaporated by the heater 8 from the section 5, good startability can be ensured. In addition, even after complete explosion, if the cooling water temperature Tw is low, stable drivability may not be obtained with high alcohol concentration ALC, so assist air is supplied to the fuel injection valve 4 during normal operation. By doing so, it is possible to promote atomization of the fuel and ensure ignition stability.

In addition, the cooling water temperature Tw shown in the flowchart of FIG.
The control of the air pump 7, etc. according to this will have control characteristics as shown in the time chart of FIG.

By the way, when the alcohol concentration ALC in the fuel supplied to the fuel tank 16 is stable, for example, between 85 and 100%, there is no need to provide the alcohol sensor 21, and the air pump 7 All you have to do is control it.

However, if the fuel tank 16 is refilled with only gasoline or only alcohol, and the alcohol concentration ALC in the fuel changes over a wide range,
As described above, it is necessary to provide the alcohol sensor 21 to monitor the alcohol concentration ALC in the fuel and to perform fuel control according to the alcohol concentration ALC. However, if the calibration of the alcohol sensor 21 has not been completed, such as after the fuel tank 16 has been refueled, if the fuel is controlled based on the detected value of the alcohol sensor 21, The amount of fuel actually injected and supplied ends up being too much or too little. In particular, if excessive fuel is supplied at the time of starting, there is a risk that the ignition plug will become wet and the engine will not be able to start.

For this reason, in this embodiment, as in the second embodiment shown in the flowchart of FIG. 7, in addition to improving the fuel spray as shown in the flowchart of FIG. 5, the fuel injection amount at the time of starting is controlled. Improved starting performance. Incidentally, as shown in the flowchart of FIG. 7, the control unit 13 here also serves as first starting fuel control means, second starting fuel control means, and low temperature starting control permitting means.

First, in step 21, it is determined whether the calibration of the alcohol sensor 21 has been completed. Alcohol sensor 2
In calibration 1, for example, it is determined based on the remaining amount of fuel whether or not the fuel tank 16 has been refueled before starting, and when refueling has occurred, the alcohol sensor 21 detects the fuel in the fuel tank 16. This is done based on the deviation of the actual air-fuel ratio from the target air-fuel ratio. Alternatively, it may be determined that the calibration has been completed when the rate of change in the value detected by the alcohol sensor 21 becomes equal to or less than a predetermined value.

If it is determined in step 21 that the calibration of the alcohol sensor 21 has not been completed, the process proceeds to step 22, where an amount corresponding to the alcohol concentration 0% is set as the fuel injection amount for starting. As the alcohol concentration ALC in the fuel increases, the stoichiometric air-fuel ratio decreases, and the injection amount for the same intake air flow rate becomes larger than when using gasoline.
If the calibration of the alcohol sensor 21 has not been completed and the reliability of the detected value is weak, the alcohol concentration is set to 0% in order to supply less fuel regardless of the detected value of the alcohol sensor 21, and the excess fuel is supplied. prevent this from happening. The starting fuel injection amount corresponding to the alcohol concentration ALC is determined by the cooling water temperature Tw, as shown in FIG.
The lower the value, the larger the value is set.

In the next steps 23-25, heater 8. Fuel injection valve for starting 6. The air pumps 7 are each turned off, and no measures are taken to improve fuel spray. Then, in step 26 and the next step 27, it is determined whether the engine l is cranking or not, and whether or not it has completely exploded. The process advances to step 28, and otherwise the routine ends.

In step 28, it is determined whether or not a complete explosion has not occurred even after cranking for a predetermined period of time 1+ (for example, 3 seconds) as a result of starting with fuel control corresponding to an alcohol concentration of 0%. Here, if it is determined that a complete explosion has not yet occurred even after cranking for the predetermined time tl, the amount of fuel injected and supplied is insufficient with respect to the required amount under fuel control corresponding to 0% alcohol concentration. It is predicted that
Proceed to step 29 and the fuel injection amount will be alcohol concentration 8.
Set it to correspond to 5%.

As shown in Figure 9, when fuel control is performed corresponding to the alcohol concentration ALCO% (100% gasoline), when the actual fuel is 100% gasoline, the cooling water temperature Tw
A cranking time of more than 3 seconds is not required unless the water is boiling over, but when the alcohol concentration ALC is about 85%, a cranking time of about 3 seconds is required even if the cooling water temperature Tw is around 0°C. Therefore, when the cranking time is approximately 3 seconds or more as described above, it can be inferred that the alcohol concentration ALC is relatively high. Therefore, more fuel (see FIG. 8) is injected and supplied by switching to fuel control corresponding to 85% alcohol concentration.

After setting the fuel control corresponding to 85% alcohol concentration in step 29, it is determined in step 33 whether or not the cranking state is in progress. If it is in the cranking state, the process proceeds to step 34 to set the cooling water temperature 'rW and the predetermined temperature. Tw+
When the cooling water temperature Tw is lower than the predetermined temperature Tw, the process proceeds to steps 35 to 37 and the heater 8
．． Turn on the starting fuel injection valve 6° and the air pump 7 to create a mixture that is more likely to ignite.

Further, if it is determined in step 33 that the cranking state is not present, and if it is determined in step 34 that the cooling water temperature 'rW is higher than the predetermined temperature Tw, step 3
Proceed to step 8. In step 38, the cooling water temperature Tw is compared with the predetermined temperature 'r'w, which is higher than the predetermined temperature Tw, and when it is lower than the predetermined temperature Twt, the temperature is determined in step 35.
It is predicted that stable operation and startability can be ensured when the temperature is higher than the predetermined temperature Tw2 even if the alcohol concentration ALC is high, and the process proceeds to Step 3.
Proceed to steps 9 to 41 to turn off all heaters 8 and the like.

On the other hand, when it is determined in step 21 that the calibration of the alcohol sensor 21 has been completed, the alcohol concentration A detected by the alcohol sensor 21 is determined in step 30.
LC is set, and in the next step 31, the fuel injection amount is set in accordance with the set alcohol concentration ALC.

Then, in the next step 32, the alcohol concentration ALC detected by the alcohol sensor 21 is set to a predetermined concentration AL.
It is determined whether or not the alcohol concentration ALC exceeds the predetermined concentration ALC, and when the alcohol concentration ALC exceeds the predetermined concentration ALC, the process proceeds to step 33 and the air pump 7 etc. are controlled according to the cooling water temperature Tw in the cranking state as described above. When the alcohol concentration ALC is lower than the predetermined concentration ALC, the process proceeds to steps 39 to 41 and the air pump 7 etc. are turned off.

In this embodiment, the assist air is not supplied to the starting fuel injection valve 6, but the starting fuel injection valve 6 may also be supplied with assist air when the heater 8 is turned on.

<Effects of the Invention> As explained above, according to the present invention, assist air is supplied to the fuel injection valve for normal operation during cold start to atomize the fuel, and the start Since the fuel injected from the fuel injection valve is heated and evaporated by the heating means, the ignitability of the air-fuel mixture supplied to the engine during cold starting is improved, improving the startability of alcohol internal combustion engines. can be done.

Also, if the alcohol sensor calibration has not been completed, try performing fuel control compatible with low alcohol concentration, and when the starting time becomes longer, switch to fuel control compatible with high alcohol concentration. When controlling fuel for high alcohol concentrations, measures to improve the ignitability of the air-fuel mixture as described above are allowed, so if the alcohol sensor has not been calibrated, excessive fuel is supplied and the engine cannot start. This has the effect that it is possible to avoid this, and that the ignitability of the air-fuel mixture is ensured when dealing with high alcohol concentrations.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a system schematic diagram showing an embodiment of the present invention, Figures 3 and 4 are detailed diagrams of the heater shown in Figure 2, and Figure 5. 6 is a flowchart showing the first embodiment of start-up control, and FIG.
FIG. 7 is a flowchart showing the second embodiment of control at startup; FIG. 8 is a graph showing the relationship between cooling water temperature and injection amount at startup; FIG. The figure is a graph showing the relationship between cooling water temperature Tw and complete explosion time. 1... Engine 2... Intake manifold 3...
・Port part 4...Fuel injection valve for normal operation 5...
・Collector part 6...Fuel injection valve for starting 7...
Air pump 8... Heater 13... Control unit 16... Engine key switch 21
...Alcohol sensor 22...Water temperature sensor Patent applicant Nissan Motor Co., Ltd. Agent Patent attorney Fujio Sasashima Figure 1 Figure 6 ＄Moving prayer platform θ1 valve o Dansha-1L-9Lf, 444□ Well flooded area>

Claims (2)

[Claims] (1) An electronically controlled fuel injection device for an alcohol internal combustion engine that uses alcohol or a mixed fuel of gasoline and alcohol as fuel, and is configured to guide assist air for fuel atomization from an assist air supply source to a nozzle hole. A fuel injection valve for normal operation is provided in the intake port of each cylinder, and a fuel injection valve for starting with a heating means for heating the sprayed fuel is provided in the collector part of the intake manifold. an engine starting state detecting means for detecting, an engine temperature detecting means for detecting an engine temperature, and an engine temperature detected by the engine starting state detecting means in the engine starting state detected by the engine starting state detecting means is below a predetermined temperature. and a low-temperature start control means for driving and controlling the heating means and the starting fuel injection valve, and supplying assist air from the assist air supply source to each normal operation fuel injection valve. Electronically controlled fuel injection system for alcohol internal combustion engines. (2) In the electronically controlled fuel injection device for an alcohol internal combustion engine according to claim 1, an alcohol sensor for detecting the alcohol concentration in the fuel is provided, and the fuel injection amount is determined based on the alcohol concentration in the fuel detected by the alcohol sensor. and when the calibration of the detected value of the alcohol sensor is not completed in the engine starting state detected by the engine starting state detecting means, a predetermined low-alcohol control is performed with priority over the detected value of the alcohol sensor. a first starting fuel control means for controlling the fuel injection amount corresponding to the concentration; and a detection value of an alcohol sensor when the starting duration time in the fuel control state by the first starting fuel control means exceeds a predetermined time. a second start-up fuel control means that switches to fuel injection control corresponding to a predetermined high alcohol concentration with priority, and a predetermined high alcohol concentration is detected when the second start-up fuel control means is activated and by a calibrated alcohol sensor. An electronically controlled fuel injection system for an alcohol internal combustion engine, characterized in that the electronically controlled fuel injection device for an alcohol internal combustion engine is provided with a low temperature start control permitting means for permitting the operation of the low temperature start control means only when the low temperature start control means is activated.