KR20030037659A - Exhaust gas recirculation controlling method of diesel engine vehicle - Google Patents

Abstract

PURPOSE: An exhaust gas recirculation(EGR) control method of a diesel engine vehicle is provided to prevent generation of black smoke by permitting the exhaust gas which is not perfectly burnt to flow into the combustion chamber and perfectly burnt. CONSTITUTION: An exhaust gas recirculation control method comprises the first step(S101 to S103) of judging whether a free acceleration is detected at the idle state maintaining a neutral transmission; the second step(S104) of switching the EGR valve from turn-on state to turn-off state and counting the preset time so as to increase output of engine when the free acceleration is detected in the first step; and the third step(S105,S106) of switching the EGR valve from turn-off state to turn-on state and re-burning the exhaust gas when a predetermined time period has lapsed.

Description

Easy control method of diesel vehicle {EXHAUST GAS RECIRCULATION CONTROLLING METHOD OF DIESEL ENGINE VEHICLE}

The present invention relates to a method for controlling an engine of a diesel vehicle, and more particularly, to a control method for an diesel vehicle for stabilizing an emission through easy control at no-load acceleration.

In general, diesel engines spontaneously ignite fuel by directly injecting fuel into high temperature air by high compression without electric ignition like gasoline engines, and use diesel fuel with low fuel consumption, high thermal efficiency and high flash point of fuel. Due to the low risk of fire, the production of large engines, and the economical characteristics of using low-cost diesel, it has been developed as a passenger car and rapidly spread.

Unlike a gasoline engine, a diesel engine maintains a constant amount of air drawn into the combustion chamber even when the driving condition changes, so when the engine is under high load or acceleration, and the shift stage is neutral and the vehicle speed is maintained at zero. There is a problem that black smog is generated by incomplete combustion due to an instantaneous excessive variation in the amount of easy EG when no-accelerating pre-acceleration occurs.

Therefore, both domestic and European regions regulate the degree of graphite in terms of environmental protection, but in the case of conventional vehicles, there is no countermeasure against it, and thus the state of the recall does not satisfy the legal regulations. It is true.

In particular, in the case of high temperature and high humidity in the summer when the filling efficiency fluctuates depending on the air density, the generation of graphite is a serious level, and the instability of the exhaust gas during the pre-excelling in the idle state of the neutral shift stage is more severe.

The present invention has been invented to solve the above problems, the purpose of which is after a certain time when the EZR solenoid valve is turned off in a diesel engine to test the concentration of the exhaust gas in the idle state of the neutral shift stage The EG solenoid valve is controlled on to satisfy emission regulation.

1 is a schematic configuration diagram of an ERG control apparatus of a diesel vehicle according to the present invention.

2 is a flowchart of an embodiment of performing an ERG control in a diesel vehicle according to the present invention;

In order to achieve the above object, the present invention provides a process for determining whether a pre-excel is detected in an idle state maintaining a neutral shift stage in a diesel vehicle, and when the pre-excel is detected, an on state for raising a stable output of the engine. Switching the easy valve of the OFF state and at the same time to counter the set time, and detecting the elapse of the set time, turning the easy valve of the OFF state to the ON state to reburn the exhaust gas. It is done.

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

As can be seen in FIG. 1, the EEG control apparatus of a diesel vehicle according to the present invention includes a shift stage detecting unit 10 that detects a current shift stage position selected by a shift lever or a selector lever and outputs an electrical signal thereto. And an accelerator pedal detector 20 for detecting the opening degree of the accelerator pedal driven by the driver, an engine speed detector 30 for detecting the current engine speed from the rotation of the crankshaft, and the respective detector signals described above. The control unit 40 for controlling the EG device by analyzing whether the pre-acceleration of the no-load sudden acceleration is generated and the EG solenoid operated by the control signal of the control unit 40 to determine the exhaust gas circulation to the combustion chamber. It consists of 50.

In the present invention of the configuration including the function as described above, the operation of performing the IR control is as follows.

Engine start-up of the vehicle is kept on, information of the shift stage detecting unit 10, the accelerator pedal detecting unit 20, and the engine speed detecting unit 30 are located at the neutral shift stage, and the displacement of the accelerator pedal and the engine speed are idle. In operation S103, it is determined whether the pre-acceleration with no load sudden acceleration is detected from the accelerator pedal detection unit 20 in the state of maintaining the state.

When a change in the opening degree of the accelerator pedal is suddenly changed to 20% or more within approximately 0.2 seconds, and the engine speed is detected to rise to approximately 5000 RPM or more from the idle speed, the control unit 40 is easy for stable increase of the engine output. The control signal is output to the Al solenoid 50 side to switch the easy valve, which remains in the on state, to the off state and starts a timer counter (S104).

Subsequently, it is determined whether the set time of the timer counter, approximately 1000ms has elapsed (S105), and when it is determined that the set time has elapsed, the controller 40 outputs a control signal to the IR solenoid 50 to maintain the off state. By turning on the easy valve is in the ON state to allow the incomplete combustion exhaust gas is re-introduced into the combustion chamber due to no-load sudden acceleration (S106).

Therefore, the exhaust gas, which is incompletely burned due to excessive mixing due to no-load rapid acceleration, is turned off to be re-introduced into the combustion chamber, and black smoke is eliminated to satisfy emission regulation.

As described above, according to the present invention, the incomplete combustion exhaust gas is reintroduced into the combustion chamber and completely combusted because black smog is not generated because the GI valve is switched on after a predetermined time in a diesel vehicle. Satisfy gas regulations

Claims (3)

In a diesel vehicle, Determining whether the pre-excel is detected in the idle state maintaining the neutral shift stage; When the pre-excel is detected, switching the on-state zigzag valve to the off state for a stable output increase of the engine and simultaneously countering the set time; And detecting the elapsed time of the set time to switch the EIG valve in the off state to reburn the exhaust gas. The method of claim 1, The pre-excel condition is a diesel vehicle, characterized in that the shift stage is a neutral position, the engine speed suddenly rises to a predetermined 5000 RPM or more at idle rotation speed, and the change in the opening degree of the accelerator pedal changes rapidly to 20% or more within 0.2 seconds. Easy control method. The method of claim 1, The delay time for the easy valve on after the pre- accelerator is set to 1000ms, characterized in that the diesel vehicle.