KR19980017149A - Injection fuel amount control method at engine start and its device - Google Patents

Abstract

According to the present invention, in the fuel injection control apparatus of an automobile, when a request for restart is detected without a normal start of the engine in response to an engine start in a cooling state, the amount of fuel re-injected to the cylinder side is attenuated to normalize the engine. It is to stabilize the exhaust gas concentration caused by excessive mixer at start-up.

According to the present invention, when the engine engine is cooled down and the engine is ignited, the fuel is simultaneously injected, and then the cylinder is compressed by cranking. Injecting the fuel amount according to the injection program, and if it is determined that the coolant temperature, the crankshaft rotation speed and the battery voltage are maintained at the normal RPM, the fuel injection is performed at an early air-fuel ratio. A process of determining whether a restart request is detected, calculating the amount of fuel remaining after being injected into the cylinder at a start request of the engine after the engine restart request is detected and combusted by a compression explosion of cranking; The amount of fuel to be injected to the request for restart is calculated from the remaining fuel amount of the cylinder, and the cylinder Include information to inhibit the engine start-up emissions in the exhaust gas due to incomplete combustion, and turns on, preventing an explosion of the cylinder to improve the durability of the cylinder and piston.

Description

Injection fuel amount control method at engine start and its device

1 is a block diagram of a configuration of an injection fuel amount control device when starting an engine according to the present invention.

2 is a flow diagram of one embodiment for executing injection fuel amount control at engine start in accordance with the present invention.

3 is a timing diagram for adjusting the injection fuel amount in a typical vehicle.

Industrial use field

The present invention relates to a fuel injection control apparatus for an automobile, and more particularly, to re-inject to the cylinder side when a request for restart is detected without a normal ignition of the engine to the initial start-up request of the engine in the cooling state. The present invention relates to a method and an apparatus for controlling the amount of injected fuel at engine start to reduce the amount of fuel to be used to stabilize the exhaust gas concentration by excluding incomplete combustion by an excessive mixer during engine start.

Conventional technology

In general, when a vehicle selects a contact of an ignition switch as a start-on contact in order to start a cooled engine while the overall operation of the ignition system is initialized, the control means sets a signal applied through the contact of the ignition switch. Analyze according to the overall operation to start the engine on.

At this time, when the ignition switch contact is turned on, the injector opens the nozzle by the power applied from the battery to increase the ratio of the mixer per unit volume of each cylinder as shown in FIG. It simultaneously injects a predetermined amount of fuel calculated according to the injection program set for the lubrication of the injector and the cylinder.The start motor is driven so that any cylinder reaches the top dead center by the rotation of the crankshaft. If any, a high voltage applied spark plug of the ignition device will cause a spark discharge that will explode the mixer of the compressed cylinder to drive the engine.

At this time, when the engine is normally ignited, the control unit detects the rotational speed of the crankshaft, adjusts the injection cycle of the corresponding injector, and attenuates the amount of fuel injected to each cylinder side. When the temperature of the battery is detected at a temperature equal to or higher than the voltage level of the battery and is detected as the normal level, the engine is determined to be in a normal state of ignition and the amount of fuel injected to each cylinder side is corrected and controlled.

If a request for restart is detected when the engine is not ignited due to the start-up request by turning on the ignition switch contact, the injector opens the nozzle by the power applied from the battery, and the predetermined amount calculated on each cylinder side. Fuel is re-injected at the same time, and the start motor is driven to rotate the crankshaft to reach the top dead center of the cylinder. Explode to drive the engine.

[Problems to Be Solved by the Invention]

In the conventional vehicle as described above, the engine fails to start even after the injector has been calibrated injector according to the rotation of the crankshaft after the fuel amount set in accordance with the start program is simultaneously injected to each cylinder side as the initial start request of the engine in the cooling state. When a request for a low restart is detected, the control means performs simultaneous injection of the fuel amount set according to the start program, and then each injector executes a correct injection according to the compression stroke of the piston through the crankshaft. Incomplete combustion is generated due to the excessive mixing ratio in the fuel cell, which causes soot and destroys the environment, and there is a problem of promoting fuel consumption due to frequent injection of unnecessary fuel amount.

In addition, the fuel injected into the spark plug is absorbed due to frequent injection of fuel, causing knocking during spark discharge for ignition, and impairing the stability of starting. Excessive inhalation causes strong explosion force due to the explosion of fuel, which wears down the inner wall of the cylinder. There was a problem letting.

[Objective to solve the problem]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and its object is to detect the nozzle opening and closing of the injector when a request for restarting is detected when the engine is not ignited at the initial start-up request of the engine in the cooling state. By controlling the amount of fuel to be re-injected to the cylinder side by controlling the concentration of the exhaust gas to keep the concentration of the exhaust gas stable, and to keep the explosion force stable to prevent the wear of the cylinder.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a method for controlling fuel injection, wherein when a demand for starting is detected in a cooled engine in the ignition reset mode, a predetermined amount of fuel is compressed by cranking after simultaneously injecting the calculated fuel amount in each cylinder. A first process of sequentially starting the mixing spray on the cylinder side and simultaneously starting the mixer sucked through the spark plug;

If the engine is normally started after the first process, the fuel amount calculated in accordance with the set injection program is performed.If the detected coolant temperature, the rotation speed of the crankshaft, and the voltage of the battery are determined to maintain the normal RPM, the fuel of the theoretical air-fuel ratio A second process of performing the spraying,

A third step of determining whether a restart request is detected from the switching means if the engine does not start normally after the first step;

A fourth step of calculating the amount of fuel remaining after being injected into the cylinder from the start request of the engine after the engine restart request is detected and combusted by a compression explosion of the cranking;

And a fifth step of calculating a fuel amount to be injected to the request for restart from the cylinder remaining fuel amount calculated in the fourth step and correcting the injection to each cylinder.

In addition, the present invention, in the fuel injection control device, a predetermined contact is selected according to the operation of the ignition key and outputs a corresponding signal, and switching for supplying the voltage of the battery to the driving means side through the selected contact Sudan,

Water temperature detection means for circulating the cylinder block to absorb heat from the engine and detecting a temperature of the coolant to radiate heat through the radiator core to output a predetermined signal;

Engine operation detection means for detecting an operation state for starting the engine and outputting a predetermined pulse signal through the rotational speed of the crankshaft rotating by the self-power generated by the start motor or the explosion of the engine;

When the engine is requested to start, control the simultaneous injection of each cylinder, and if the request signal for restart is detected due to the engine failed to start, it is injected to the cylinder side according to the simultaneous injection and the correct injection. Control means for controlling the fuel amount injection by calculating a fuel amount capable of calculating and igniting a normal engine;

Voltage detecting means for detecting a voltage and a current level to the battery to detect whether the engine is started or whether the engine is normally exploded and output a signal corresponding thereto;

And an injector for injecting the amount of fuel calculated by opening and closing the nozzle at a predetermined cycle by switching internal relay contacts to a power source applied from a battery according to a signal from the control means.

Example

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the injection fuel amount control apparatus for starting the engine according to the present invention includes a switching unit 10, a water temperature detector 20, an engine operating state detector 30, a controller 40, and a voltage detector. 50 and the injector 60, the switching unit 10 selects a predetermined contact according to the operation of the ignition key and outputs a predetermined signal corresponding thereto, and drives the voltage of the battery through the selected contact. Supply to the means side.

The water temperature detector 20 detects the temperature of the coolant circulating through the cylinder block to absorb heat from the engine, and then radiates heat through the radiator core, and outputs a predetermined electrical signal corresponding thereto.

The engine motion detection unit 30 detects an operation state for starting the engine through the rotational speed of the crankshaft rotated by the magnetic force caused by the start motor driving or the explosion of the engine and outputs a predetermined pulse signal corresponding thereto.

The controller 40 controls the overall operation for the operation of the engine according to the signals applied from the respective detection means, and when the on contact selection signal for starting the engine in the cooling state is detected from the switching unit 10, the injector is operated. After controlling the simultaneous injection of the fuel amount calculated on each cylinder side, control the injection of the corrected fuel amount on the cylinder side according to the stroke of the piston, and restart the engine without the ignition of the engine upon the initial engine start request. When a request is detected, the fuel is injected to the cylinder side according to the simultaneous injection and the correct injection, and the amount of fuel consumed and remaining at the start of the engine is calculated to control the injection of the fuel amount as much as the engine can start normally.

The voltage detector 50 detects whether the engine is started or whether the engine is normally exploded through the level of voltage and current applied from the battery, and outputs a predetermined electrical signal corresponding thereto.

The injector 60 injects the calculated fuel amount to the cylinder side by opening and closing the nozzle at a predetermined period by switching an internal relay contact to a power applied from the battery according to a signal applied from the controller 40.

In the present invention having such a function, an operation of correcting the injection fuel amount for the engine restart request will be described with reference to FIG. 2.

In the state where the engine is cooled and the ignition mode is kept reset (step 101), the control unit 40 detects a signal applied from the switching unit 10. When a signal applied from the unit 10 is detected by the selection of the ignition contact for starting the engine (step 102), the control unit 40 injects a predetermined amount of fuel for injecting the amount of fuel calculated according to the set starting program to the entire cylinder side. The control signal is applied to the injector 60 side (step 103).

Therefore, the injector 60 is opened and closed for a predetermined period by the voltage applied from the battery according to the control signal applied, injects a predetermined amount of fuel to the entire cylinder side, and rotates according to the driving of the start motor. The amount of fuel sucked into each cylinder side is corrected according to the angle.

At this time, the high voltage of the ignition device is applied to any cylinder side compressed in accordance with the rotation of the crankshaft to perform ignition for starting the engine (step 104).

In the execution of the step 104, the control unit 40 detects the rotational speed of the crankshaft applied from the engine operation detection unit 30 and the state of the battery voltage and current applied from the voltage detection unit 50 and starts the engine on a normal explosion of the engine. It is determined whether to maintain the state (step 105).

When it is detected in the step 105 that the normal explosion of the engine, the temperature of the coolant applied from the water temperature detector 20 and the state of the battery voltage applied from the voltage detector 50 and the rotational speed of the crankshaft applied from the engine motion detector 30 Is detected and comprehensively analyzed according to the set program (step 106), the amount of fuel injected to each cylinder side is calculated, and the amount of fuel injected through the drive of the injector 60 is corrected (step 107). Is determined to maintain the normal PRM of the engine (step 108), and the opening / closing period of the injector 60 is corrected to inject fuel suitable for the theoretical air-fuel ratio (step 109).

If it is detected in step 105 that the engine is not ignited by the start request, it is determined whether the request signal for restart is detected from the switching section 10 (step 111).

If the request for restarting is not detected in step 111, the overall operation for starting the engine is not executed. If the request for restarting is detected, combustion is performed in the operation of starting from the amount of fuel injected into the cylinder when the request for restarting is started. Then, the amount of remaining fuel is subtracted and detected according to the set program (step 112), and then a correction amount for re-injection is calculated (step 113).

Subsequently, when the control unit 40 applies a predetermined control signal to the injector 60 to inject only the corrected fuel amount to each cylinder side, the injector 60 opens and closes the nozzle by the corresponding period and is injected to the cylinder side. The fuel amount is corrected (step 114).

effect

As described above, according to the present invention, when a request for restart is generated when the engine is not ignited in the first attempt at the start of a cooled engine, the cylinder is injected to the cylinder side to calculate the concentrated fuel amount and then re-inject. By attenuating and correcting the amount of fuel used to prevent excessive intake of fuel on the cylinder side, it is possible to suppress the exhaust of excessive exhaust gas due to incomplete combustion at engine start-up, to maintain the gas concentration suitable for exhaust regulation, and to over-explode the cylinder. It improves the durability of the cylinder and piston by preventing the, and the knocking is suppressed by the elimination of the excessive mixer provides stability to the start of the engine.

Claims (2)

In the fuel injection control method, When the engine is cooled down in the ignition reset mode, a start-up request is detected, and the fuel quantity calculated for each cylinder is injected simultaneously, followed by a corrective injection to the predetermined cylinder side compressed by cranking, and suction through the spark plug. A first process of igniting the mixed mixer, If the engine is normally started after the first process, the fuel amount calculated in accordance with the set injection program is performed.If the detected coolant temperature, the rotation speed of the crankshaft, and the voltage of the battery are determined to maintain the normal RPM, the fuel of the theoretical air-fuel ratio A second process of performing the spraying, A third step of determining whether a restart request is detected from the switching means if the engine does not normally ignite after the first step; A fourth step of calculating the amount of fuel remaining after being injected into the cylinder to the starting request of the engine after the engine restart request is detected and combusted by a compression explosion of the cranking; And a fifth process of calculating a fuel amount to be injected to the request for restarting from the cylinder remaining fuel amount calculated in the fourth process, and correcting and injecting the cylinder into each cylinder. In the fuel injection control device, A switching means for selecting a predetermined contact and outputting a corresponding signal according to the operation of the ignition key, and supplying the voltage to the corresponding driving means of the battery through the selected contact; Water temperature detection means for circulating the cylinder block to absorb heat from the engine and detecting a temperature of the coolant to radiate heat through the radiator core to output a predetermined signal; Engine operation detection means for detecting an operation state for starting the engine and outputting a predetermined pulse signal through the rotational speed of the crankshaft rotating by the self-power generated by the start motor or the explosion of the engine; When the engine is requested to start, control the simultaneous injection of each cylinder, and if the request signal for the restart is detected due to the failure of the engine, it is injected to the cylinder side according to the simultaneous injection and the correct injection. Control means for controlling the fuel amount injection by calculating a fuel amount capable of calculating and igniting a normal engine; Voltage detecting means for detecting a voltage and a current level to the battery to detect whether the engine is started or whether the engine is normally exploded and output a signal corresponding thereto; And an injector for injecting a fuel amount calculated by opening and closing a nozzle at a predetermined cycle by switching internal relay contacts to a power source applied from a battery according to a signal from the control means. Device.