KR20020054833A - Method of removing pollutant in bypass - Google Patents

Abstract

PURPOSE: A fluent air introduction is carried out for preventing pollution in an idle state, thereby maintaining comfortable driving. CONSTITUTION: A method for removing contamination comprises a step of turning off an ignition key, a step of turning off an injector and spark and turning on ISA(idle speed actuator), a step of changing ISA duty after ISA maintain time, and a step of turning off ISA when a scrapping time is over three times and turning off an ECU power. Therefore, a contamination is removed effectively.

Description

Decontamination method of bypass unit {METHOD OF REMOVING POLLUTANT IN BYPASS}

The present invention relates to a decontamination method of the bypass device.

Most automobiles use an electronic control engine that injects fuel according to the amount of air sucked in. The output from the electronic control engine is determined by the amount of air sucked in.

An electronic control engine includes a computer called an electronic control unit (ECU) and a device for measuring the amount of air sucked in, one example of which is an air flow meter, in which an ECU is driven by an injector according to the amount of air measured by the air flow meter. The injection time is controlled to allow combustion to occur at an appropriate air-fuel ratio.

The throttle body provided with a bypass passage includes a throttle valve that controls the amount of air sucked into the cylinder, a throttle body in which the throttle valve is installed, and the intake air passing through the throttle body is temporarily stored in the intake air. It consists of a surge tank which reduces pulsation, and a bypass passage which is provided on the side of the throttle body and is a passage through which intake air is bypassed when the opening degree of the throttle valve is small. In a throttle body equipped with a bypass passage, intake air passes through the throttle valve or through the bypass passage to the surge tank, and the surge tank distributes air to each cylinder through the intake manifold. If the throttle valve is opened by stepping on the accelerator, the intake air passes directly through the throttle valve without passing through the bypass passage and enters the surge tank. When the throttle valve is opened, the intake air passes through the throttle valve, The furnace is also introduced at the same time to be delivered to the surge tank.

In particular, when operating at idle, the opening of the throttle valve is close to zero, so that the intake air is transmitted to the surge tank through the bypass passage. Therefore, the amount of intake air bypassed through the bypass passage may be such that the engine can maintain a sufficient operating state.

However, when the engine is used for a long time, carbon is deposited in the bypass passage, so that the cross-sectional area is reduced, so that the amount of air introduced through the bypass passage is significantly reduced and the idling operation becomes unstable.

The technical problem to be achieved by the present invention is to remove the contamination of the bypass device.

1 is a flowchart illustrating a decontamination method of a bypass device according to an embodiment of the present invention.

2 is a graph showing the relationship between the ISC duty ratio and time.

According to the invention, the ignition key is first turned off, then the injector and spark are turned off and the ISA is turned on. Next, change the ISA duty after the ISA maintenance period has elapsed. If the scraping count is three or more times, turn off the ISA and turn off the ECU.

Here, it is preferable to repeat the step of changing the duty for maintaining the first delay time at the ISC close duty ratio and increasing the duty ratio at the ISC close and maintaining the second delay time at the ISC open duty ratio.

In the present invention, it is possible to prevent the contamination of the engine by stopping the engine in order to prevent the contamination by preventing the inflow of smooth air in the idle state, the driver does not need to remove the dust of the air inlet separately.

Then, with reference to the accompanying drawings will be described in detail to be easily carried out by those skilled in the art with respect to the decontamination method of the bypass device according to an embodiment of the present invention.

First, with reference to Figures 1 and 2 will be described in detail with respect to the decontamination method of the bypass device according to an embodiment of the present invention.

1 is a flowchart illustrating a decontamination method of a bypass device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the engine is started (step S110) to start engine operation (step S120), and then the ignition key of the vehicle is turned off (step S130). If the ignition key is not turned off, engine operation continues.

When the ignition key is turned off, the injector and the spark are turned off to turn on the idle speed actuator (ISA), which is a device for controlling the air volume to regulate the idle of the engine (step S140).

After the maintenance period of the ISA has elapsed (step S150), the ISA speed is changed within the range of 5% to 95%, and the open-close of the ISC (idle speed contoller) is repeated (S160). step).

If the number of scrapings is repeated three times or more by repeating the open-close (step S170), the ISA is turned off and the ECU (electronic control unit) power that is the computer control unit for the engine is turned off (step S180). If the number of scrapings is less than three, continue to open-close.

Next, the ISA duty change will be described with reference to FIG. 2.

2 is a graph showing the relationship between the ISC duty ratio and time. Here, the horizontal axis represents time and the vertical axis represents ISC Duty Ratio.

Delay time (ISCSCRTIM0) after initial ignition value (ISCKEYOFFC) to some time before ISC scraping after turning off ignition key, then drop to duty ratio (ISCSCR2) when closing ISC It is maintained for the time ISCSCRTIM2. Next, the duty ratio goes up to the duty ratio ISCSCR1 at ISC open and is maintained for the delay time ISCSCRTIM1. In this case, the slope ISCSCRDELC represents an amount of duty change per hour when the ISC is opened or closed. As described above, the ISC open-close count value (ISCSCRCNTC) is measured while the ISC open and close duty ratios are repeatedly changed.

As such, when the engine stops, the ISA plate is forcibly opened and closed repeatedly to remove contaminants such as carbon or dust, thereby preventing the engine from being stopped or stopped.

As described above, in the present invention, smooth inflow of air is prevented in the idle state to prevent contamination of the engine or stopping of the engine, and the number of times the driver removes dust from the air inlet to maintain a comfortable driving state is increased. This reduces the amount of cleaning.

Claims (2)

Turning off the ignition key, Turning off the injector and spark and turning on ISA, Changing the ISA duty after the ISA retention period has elapsed, Turning off the ISA and powering off the ECU if the number of scrapings is three or more times Decontamination method of the bypass device comprising a. In claim 1, The changing of the duty may include maintaining the first ratio at the ISC closed duty ratio and increasing the ISC closed duty ratio to maintain the second SC at the ISC open duty ratio. Decontamination method.