KR100282912B1 - Fuel level correction device at start-up and its method - Google Patents

Abstract

The present invention relates to a fuel amount correcting device at startup, comprising: a start switch; Cooling water temperature sensing means for sensing a temperature of cooling water; Engine speed detection means for detecting an engine speed; When the start switch is activated, the fuel injection is controlled according to the set starting fuel amount.When the detected engine speed reaches a certain speed, the fuel is controlled according to the initial fuel amount which reduces the starting fuel amount by a certain ratio, and then decreases the constant value in the initial fuel amount. Control means for outputting a corresponding control signal according to the amount of the reduced fuel amount by maintaining a state in which the amount of reduced fuel is smaller than the multiplied set value by the correction factor set according to the cooling water temperature detected according to the amount of the basic fuel set in accordance with the amount of inhaled air and; And a fuel injection means for supplying the corresponding fuel to the engine according to the control signal, and controlling the fuel amount at the time of starting so as not to deviate from a predetermined range of the fuel amount which can be set according to the amount of air sucked in. Phenomenon such as engine speed drop and stall can be prevented.

Description

Fuel level correction device at start-up and its method

The present invention relates to a fuel amount correcting device and a method thereof for starting, more specifically, a fuel amount correcting field for starting so as to control not to deviate from a certain range of fuel amount that can be set according to the amount of air sucked in at the time of starting. Chi and its method.

In general, the operation of the engine varies greatly depending on the driving state of the vehicle.

Therefore, the amount of fuel injected into the engine, the operation timing of the ignition device, and the like vary depending on the driving state of each vehicle, thereby changing the output power of the engine so that stable and efficient driving operation of the engine can be achieved.

Therefore, the engine control device sets the injection amount of the basic fuel in accordance with the amount of air sucked through the throttle valve whose opening degree changes according to the operation state of the accelerator pedal.

In addition, by correcting the injection amount of the basic fuel calculated according to the state of the driving road of the vehicle or the load state applied by the operation of various load devices, the engine output state is changed to match the driving state of the vehicle, thereby improving driving performance and riding comfort of the vehicle. You can.

However, when the driving state of the engine is in the idling state, that is, at start-up, the vehicle enters the normal driving state by executing a separately set control operation without executing the general engine control operation as described above.

When the engine is in the idling state, the accelerator pedal does not operate, and thus the amount of air sucked through the throttle valve is virtually eliminated. In order to execute the idling control of the engine, a separate idle control device (ISCA) is used. ) Is installed.

Therefore, by controlling the operation of the idle control device in accordance with the state of the engine or the climatic conditions of the surrounding environment, by adjusting the amount of air sucked through the bypass passage formed in the idle control device, the driving state of the vehicle Ensure that the proper idling control action is taken.

After the start operation is performed as described above, as shown in FIG. 1 attached to the engine, the engine speed starts to vary according to the driver's acceleration pedal, and the throttle valve starts to open.

When it is determined that the detected engine speed is in a slow state in which the detected engine speed is gradually increasing, the engine control device reduces the amount of starting fuel arbitrarily set at the start by a certain ratio, and then decreases the amount by a certain period thereafter.

More specifically, as shown in the accompanying FIG. 2, the fuel injection is controlled by the starting fuel amount of A at the start, and when the engine speed is determined to be full, the starting fuel amount is reduced by a predetermined ratio to reduce the B (A x factor). Fuel injection is controlled by the amount of fuel.

Next, the fuel amount of B is decreased by a predetermined value at regular intervals, and fuel injection is performed in accordance with the amount of fuel reduced until the basic fuel amount C is set according to the amount of air sucked into the intake manifold by opening the throttle valve. To control.

The basic fuel amount C is a value calculated according to the amount of intake air detected by a map sensor, and corresponds to the A ', B', and C 'lines shown in FIG. 2.

However, at this time, the amount of fuel BC which is reduced every cycle from immediately after starting to the time of departure of the vehicle is much higher than that of the B'C line corresponding to the basic injection amount, so that the engine speed is slow as shown in FIG. There is a disadvantage that the fluctuation is not increased but fluctuates.

In order to solve this problem, reducing the amount of BC lines reduced every cycle to the B'C lines, a drop phenomenon, a stall phenomenon, or the like, in which the engine speed drops sharply occurs.

An object of the present invention is to solve the above-mentioned disadvantages, and controls the engine speed instability due to the fuel oversupply by controlling the fuel amount at start-up so as not to be out of a certain range of the fuel amount that can be set according to the amount of air sucked in An object of the present invention is to provide a fuel amount correcting apparatus and a method for starting the same.

1 is a graph according to a fuel injection control in a conventional start-up,

Fig. 2 is a block diagram showing the configuration of the fuel amount correcting apparatus at start-up according to the embodiment of the present invention.

3 is an operation flowchart of a fuel amount correction method at start-up according to an embodiment of the present invention;

4 is a graph of fuel injection control at start-up according to an embodiment of the present invention.

The configuration of the present invention for achieving the above object,

A start switch;

Cooling water temperature sensing means for sensing a temperature of cooling water;

Engine speed detection means for detecting an engine speed;

When the start switch is activated, the fuel injection is controlled according to the set starting fuel amount.When the detected engine speed reaches a certain speed, the fuel is controlled according to the initial fuel amount which reduces the starting fuel amount by a certain ratio, and then decreases the constant value in the initial fuel amount. Control means for outputting a corresponding control signal according to the amount of the reduced fuel amount by maintaining a state in which the amount of reduced fuel is smaller than the multiplied set value by the correction factor set according to the cooling water temperature detected according to the amount of the basic fuel set in accordance with the amount of inhaled air and;

And fuel injection means for supplying the fuel to the engine according to the control signal.

Another configuration of the present invention for achieving the above object,

Performing fuel injection according to a set starting fuel amount when the start switch is operated;

Performing fuel injection according to the initial fuel amount at which the starting fuel amount is reduced by a predetermined ratio when the engine speed reaches a predetermined rotation speed;

Performing fuel injection according to the amount of reduced fuel whose constant value is reduced in the initial fuel amount;

Sensing the cooling water temperature and calculating a correction factor accordingly;

And performing fuel injection so as to maintain a state equal to or less than a value obtained by multiplying the correction factor by a basic air amount set according to the amount of air to be reduced.

With the above configuration, the most preferred embodiment which can be easily carried out by those skilled in the art with reference to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 2 is a block diagram showing the configuration of the fuel amount correcting apparatus at start-up according to the embodiment of the present invention.

3 is an operation flowchart of a fuel amount correction method at start-up according to an embodiment of the present invention;

4 is a graph of fuel injection control at start-up according to an embodiment of the present invention.

As shown in FIG. 2, the configuration of the fuel amount correcting apparatus at start-up according to the embodiment of the present invention includes a starter switch IS and an engine speed detection unit mounted at an output side of the engine to detect engine speed. 10), an air amount measuring unit 20 for measuring the amount of air sucked into the intake manifold, a cooling water temperature detecting unit 30 for detecting the temperature of the cooling water, and the start switch IS and the detecting unit 10 The engine control unit 40 connected to the output terminal of the unit 30 and outputting a control signal for maintaining the starting fuel amount in a predetermined range, and the fuel in accordance with a driving signal applied to the output terminal of the engine control unit 40. It consists of a fuel injection unit 50 for injecting the engine.

The engine speed detecting unit 10, the air amount measuring unit 20 and the throttle valve detecting unit 30 is a known technique, a detailed description thereof will be omitted.

The operation of the fuel amount correcting device at start-up according to the embodiment of the present invention by the above configuration is as follows.

When power is applied according to the operation of the ignition key of the driver, the engine control unit 40 initializes all the use variables, and then performs the start control operation according to the routine shown in FIG.

In the above, when the start switch IS is operated, the engine control unit 40 reads a starting fuel amount set to an arbitrary value from an internal memory (not shown) and drives the fuel injection unit 50 according to the read starting fuel amount (S110). .

As shown in the attached graph shown in FIG. 4, the engine controller 40 rotates the engine speed in a state where idling is performed by injecting fuel according to a predetermined starting fuel amount A regardless of the intake air amount through the throttle valve. Detect whether to determine the engine speed change.

The engine speed starts to change as the driver begins to press the accelerator pedal to start with the engine started. The engine speed sensor 30 is mounted on the crankshaft of the engine to detect the output speed, that is, the engine speed and output an electric pulse signal corresponding thereto to the engine controller 40.

The engine controller 40 counts an electric pulse signal applied from the engine speed sensor 30 to detect the engine speed according to the current engine driving (S120), and a full width at which the engine speed starts to increase by starting the engine. If it is determined that the state is as described above, the starting fuel amount is reduced by a certain ratio, and the fuel injection unit 60 is driven according to the reduced fuel amount (S130 to S140).

The amount of fuel in which the starting fuel amount is reduced by a certain ratio is set as the initial fuel amount after the full width.

Next, the constant value α is decreased in the initial fuel amount after the full width (S150), and the value is compared with the set value. The amount of fuel whose constant value α is reduced in the initial amount of fuel is set as the reduced fuel amount.

When the amount of reduced fuel is greater than or equal to the set value obtained by multiplying the correction factor by the base fuel amount, the engine control unit 40 controls the fuel injection while decreasing the constant value α from the value.

The basic fuel amount represents a fuel amount set according to the amount of air sucked in by opening the throttle valve according to the accelerator pedal operation, and the correction factor is a value already set according to the temperature of the detected coolant, which is not illustrated by the engine controller 40. The table is mapped and stored in memory as follows.

Water temperature -30 ° C -10 ° C 10 ° C 30 ° C 50 ° C 80 ° C Target fuel quantity ratio 1.2 1.15 1.15 1.05 1.00 1.00

Therefore, the engine controller 40 measures the temperature of the coolant according to the signal output from the coolant temperature sensor 30, reads a correction factor stored in the internal memory according to the measured coolant temperature, and reads the correction factor. Is multiplied by the basic fuel amount to calculate a set value (S150 to S170).

That is, the fuel amount is controlled in accordance with the amount of air sucked in after the start is performed by controlling the fuel injection while reducing the amount of reduced fuel amount by a predetermined value α until the amount of reduced fuel is smaller than the set value multiplied by the correction factor by the base fuel amount. Until it is set, it is controlled so that the amount of reduced fuel is kept within the setting range of the fuel amount which can be set according to the amount of air actually sucked in (S180).

However, when the amount of reduced fuel is smaller than the set value obtained by multiplying the basic fuel amount by the correction factor, it is determined whether the amount of reduced fuel is less than or equal to the basic fuel amount (S190).

When the amount of reduced fuel is larger than the basic fuel amount, that is, when the time at which the fuel injection is to be controlled is not reached according to the amount of inhaled air, the flow returns to the reduced fuel amount reduction step S150 to repeat the operation.

However, in the case where the amount of reduced fuel is less than or equal to the basic fuel amount, that is, when the time at which the fuel injection should be controlled is reached in accordance with the amount of inhaled air, the engine control unit 40 performs normal fuel injection in accordance with the amount of inhaled air. Control is performed (S200).

As described above, according to the embodiment of the present invention, by controlling the fuel amount at the start so as not to be out of a predetermined range of the fuel amount that can be set according to the amount of intake air, the engine speed drop, stall according to the excessive supply of fuel at the start It provides an effect that can prevent such a phenomenon.

This provides the effect of improving the startability.

Claims (4)

A start switch; Cooling water temperature sensing means for sensing a temperature of cooling water; Engine speed detection means for detecting an engine speed; When the start switch is activated, the fuel injection is controlled according to the set starting fuel amount.When the detected engine speed reaches a certain speed, the fuel is controlled according to the initial fuel amount which reduces the starting fuel amount by a certain ratio, and then decreases the constant value in the initial fuel amount. Control means for outputting a corresponding control signal according to the amount of the reduced fuel amount by maintaining a state in which the amount of reduced fuel is smaller than the multiplied set value by the correction factor set according to the cooling water temperature detected according to the amount of the basic fuel set in accordance with the amount of inhaled air and; And a fuel injection means for supplying the fuel to the engine in accordance with the control signal. The fuel injection amount correcting apparatus at start-up according to claim 1, wherein the control means controls the fuel injection according to the basic fuel amount, not the reduced fuel amount, when the amount of reduced fuel is less than or equal to the basic injection amount. Performing fuel injection according to a set starting fuel amount when the start switch is operated; Performing fuel injection according to the initial fuel amount at which the starting fuel amount is reduced by a predetermined ratio when the engine speed reaches a predetermined rotation speed; Performing fuel injection according to the amount of reduced fuel whose constant value is reduced in the initial fuel amount; Sensing the cooling water temperature and calculating a correction factor accordingly; And performing fuel injection so as to maintain a state equal to or less than a value obtained by multiplying the correction factor by the basic air amount set according to the amount of air to which the reduced fuel amount is inhaled. The method of claim 3, And controlling the fuel injection according to the basic fuel amount, not the reduced fuel amount, when the amount of reduced fuel is less than or equal to the basic injection amount.

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