KR100217100B1 - Method for control of rotating speed of engine - Google Patents

Abstract

The present invention relates to a method for controlling the rotation speed of an engine, and in particular, to an engine rotation speed control method for preventing occurrence of an engine stop situation due to a decrease in engine speed in a starting state, A control method provided for the purpose of improving the startability by preventing the decrease in the engine speed and the stopping of the engine caused by controlling the basic duty constantly in the steady state even when the engine speed is equal to or less than the target speed, When a certain time has elapsed in the first process in which the normal number of revolutions has been reached after completing one mixer combustion process and the engine is warmed up, the idle speed control system starts to process the idle speed control duty rate with the normal state attenuation rate and decay rate A second process, and the second process, A third step of delaying the idle speed damping period for controlling the damping period to perform the damping period transition process; and a third step of damping the target damping rate when the target rotation speed is reached as a result of the damping period delay process. And a fourth step of adjusting the rotational speed according to the duty cycle value after setting the damping period value.

Description

How to control engine speed

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flow chart according to an embodiment of the present invention.

FIG. 3 is an exemplary view showing a duty and period relationship, a function relationship between an idling period and a required time according to an embodiment of the present invention.

[Industrial Applications]

The present invention relates to an engine speed control method, and more particularly, to a method of controlling an engine speed control method in which when a revolution speed of an engine suddenly rises to a rich mixture ratio immediately after an engine is started, The present invention relates to an engine speed control method for preventing an engine speed from being lowered below a target speed by delaying a damping duty cycle when an engine speed is detected to be less than a predetermined speed, will be.

BACKGROUND ART [0002]

Generally, when the engine is operated in a cooled state, a rich mixer for improving the startability is supplied and burned.

The cooling water temperature is detected and the idling speed is controlled while the cooling water temperature is detected. If the idling speed reaches the normal idling speed, the idling speed control system attenuates to the steady state basic duty ratio, .

However, while the damping width of the basic duty ratio is maintained, the number of revolutions falls below the target number of revolutions.

[Problems to be solved by the present invention]

As described above, in the conventional approach of approaching from the increased engine speed to the target engine speed due to starting, the damping period which is continuously imposed with the steady state duty ratio is maintained without considering the transition state due to the hysteresis of the revolution number, There is a problem that the number of revolutions of the engine is lowered due to a situation where the number of revolutions is less than the target number of revolutions and the engine is stopped even in severe cases.

[Object of the Invention]

In order to solve the above-mentioned problems, in the present invention, when the number of revolutions of the engine suddenly increased rapidly after the start of the engine is gradually decreased, the damping period of the basic duty ratio of the steady state revolution number is extended Thereby reducing the possibility that the number of revolutions will fall below the target number of revolutions, and stably releasing the target number of revolutions to the target number of revolutions, thereby improving the starting performance of the engine.

[Method for solving the problem]

When the electronic control unit of the engine which senses the ignition key 'on' instructs the driving of the driving device based on the engine state information in accordance with the detection signal of the sensor, the first mixer combustion process proceeds to increase the number of revolutions of the engine And a second step of starting to process the idling speed adjusting duty ratio as a steady state basic damping rate and a damping period as a first step for controlling the target idling speed when a certain period of time has elapsed from the steeply rising engine speed state, A third step of delaying an attenuation duty cycle of the idle speed control by reading the approach to the target rotation speed while the second process is progressing, and performing an engine speed history transition process; When the target rotation speed is reached as a result of the hysteresis transition process, the damping period value of the target duty ratio is set, It provides a rotational speed control of the engine characterized in that consisting of a fourth process of performing the control of the rotation speed.

[Example]

Best Mode for Carrying Out the Invention The most preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a rotational speed control method for an engine according to the present invention,

An intake air temperature sensor 11 for detecting the temperature of the air sucked into the engine and providing information on the fuel injection amount and the air-fuel ratio control through the difference in the air density, A throttle opening ratio sensor 13 for detecting whether the load is in an idling idling state or an increasing state and providing fuel injection amount adjustment information, and a throttle opening ratio sensor 13 for measuring the intake air amount, An air flow meter 14 for providing timing information, a crank angle sensor 15 for checking the rotational angle of the crankshaft necessary for ignition timing control and providing information on engine speed measurement, An engine rotation speed sensor (16) that provides information that can determine an operation mode constitutes a sensor section, converts detection information into a constant electric signal, Output unit 21,

The electronic control unit 21 receives the output information of the sensor through the input processing circuit interface and controls the overall operation for controlling the rotation speed of the engine in the microprocessor and drives the revolution control device through the output processing circuit interface ,

An injector 31 for adjusting the fuel injection amount by opening and closing a valve in accordance with the hydraulic circuit, an orbital regulation device 32 for adjusting and compensating the engine speed at the time of idling, an ignition device 33 for directly increasing / decreasing the engine speed, And a purge control valve (34) for preventing the evaporation gas of fuel from flowing into the intake manifold at idling and then sucking it into the cylinder.

The operation sequence of the present invention implemented through such an apparatus will now be described with reference to a flow chart of FIG. 2 and an exemplary relationship diagram of FIG.

The electronic control unit 21 detects whether the ignition key of the engine is in the ON state (S1).

The electronic control unit 21, which detects the ignition key "on", drives the driving device for the rich mixture combustion to increase the engine speed (S2).

The engine speed sensor 16, the crank angle sensor 15, the coolant temperature sensor 12, and the like, detects the surge of the engine rotation speed while the combustion of the engine is running at a rich mixing ratio, If the rotational speed reaches the steady state rotational speed as indicated by the arrow A in the example of FIG. 3 (a), as shown in the section b of the example of FIG. 3 (b), the first step for the target revolution speed control, The fuel injection amount and the ignition timing are controlled by the injector 31 and the ignition device 33 while the rotational speed duty is reduced by the basic duty ratio and the duty cycle value in the normal state (S3).

It is read whether or not the rotation number information detected by the rotation number detection sensor 16 is close to the target rotation number set in the electronic control unit 21 (S4).

If the target rotation speed is not reached as a result of step S4, the process loops back to step S3 to perform the rotation speed reduction operation to the steady state basic duty value.

If the target rotation speed is close to the set target rotation speed in step S4, the rotation speed control changes the rotation speed hysteresis curve section shown in FIG. 3 (S5).

In the control of the steady state engine speed basic duty ratio, the damping period value for matching with the target duty ratio is delayed by t time in the example of FIG. 3 (a), and the damping duty ratio is constantly progressed as the steady state damping duty ratio (S6).

In step S7, the target rotational speed detection is performed according to the target duty ratio as a result of the transition of the rotational speed hysteresis curve section in steps S5 and S6, and the duty cycle period value is delayed by looping to step S6.

As a result, when the soft landing and landing is completed with the target rotation speed, the target duty attenuation delay period value is set (S8).

In step S9, the engine speed is controlled while controlling the idle speed regulator 32 with the duty delay period set in step S8.

[Effects of the Invention]

The present invention is characterized in that when the engine is warmed up for warming up a winter cooled engine or when the summer air conditioner is operated, In order to solve the situation in which the engine speed decreases due to the progression of the speed duty damping period or the engine stop occurs, the damping period of the idling speed adjusting duty ratio is extended at a rotation speed slightly higher than the target rotation speed, There is an effect that solves the problem of instability in starting.

Claims (2)

In the method of controlling the rotation speed of the engine, if a certain time has elapsed in the rapidly increased engine speed state according to the ignition key 'ON' and the engine is warmed up, the idle speed control duty ratio is set to be the first step for the target idling speed control Starting the engine with a basic decay rate and an attenuation period of the engine speed state; performing the engine speed history transition process by delaying the decay duty cycle of the idle speed control by reading the approaching to the target engine speed during the process; And setting a damping period value of the target duty ratio and controlling the target rotational speed to the duty cycle value when the resultant rotational speed reaches the target rotational speed due to the rotational speed history section transition due to the attenuation duty cycle delay. The engine speed control method of the present invention. The method according to claim 1, wherein the completion of the target duty rate through the transition of the revolution history section is reduced to a steady state duty ratio for each delay decay period value.