KR100190880B1 - Control method of air quantity tailng in dashpot - Google Patents

Abstract

According to the present invention, the conventional dashpot air amount control method determines the dashpot air amount (ISCDPT) value regardless of the cooling water temperature and supplies more fuel than necessary at low temperature, thereby increasing the noise of the engine overshoot and generating the harmful gas. Since there is an increased problem, determining whether to enter the idle state, performing idle control by comparing the dashed air amount (ISCDPT) value and the idle basic air amount (ISCBAS) value, and the throttle opening amount (TPS) ) And detecting the coolant temperature (WTS), reducing the dashed-port air volume (ISCDPT) value at a predetermined rate up to the air volume duty value (ISCDPT1) determined according to the throttle opening degree (TPS), and depending until loss constant K _f is the phase, and a dashpot air amount (ISCDPT) value, the value children basic air quantity (ISCBAS) is determined at a certain weight ratio according to the weight constant K _f By being composed of a step, to a excessive engine noise and tailing air dashpot control method capable of reducing the amount of hazardous gas is efficient air quantity control is performed it becomes generated at the time of cold operation.

Description

DASH POT TAILING CONTROL METHOD

The present invention relates to an idle air amount control method for controlling the air volume in the idle state, and in particular, a dash port air amount tailing control method for gradually reducing the additional air amount by the dash port operated until it is switched to the idle state at deceleration. It is about.

When the accelerator pedal is released to decelerate while driving the vehicle, the throttle valve is immediately closed, thereby reducing the amount of intake air. As the amount of intake air decreases, a sudden drop in engine rpm occurs or a stall phenomenon occurs in which the engine is stopped. In this case, since the impact on the engine, in order to prevent this, when the throttle valve is closed, a certain amount of air is supplied until it is switched to the idle state.

Dash Pot slowly reduces the air volume when the throttle valve is closed, allowing the engine to naturally enter idle state, improving engine durability. However, if the dash port air amount is not appropriate, the operating time of the dash port is long and waste of fuel is large. Therefore, it is necessary to appropriately control the dash port air amount in order to protect the engine and the environment.

In the conventional dashpot air amount control method, as shown in FIG. 1, the air volume duty value ISCDPT by the dash port is reduced by a predetermined amount every predetermined time.

That is, when the driver releases the accelerator pedal to decelerate, the initial dashpot air amount ISCDPT value is determined according to the TPS at that moment, and the air amount of the predetermined amount C is reduced every predetermined time. When the dash port is stopped, the dash port air volume (ISCDPT) value becomes zero (zero) and at the same time, the idle state is switched to allow the engine to run in the idle state.

Therefore, even when the throttle valve is released at zero deceleration and the throttle opening is zero, the dash port is operated for a certain time so that the amount of air supplied to the engine is not drastically reduced, thereby preventing the engine from stalling and switching the engine to the idle state. Will be done.

However, in the conventional dashpot air amount control method configured as described above, since the dashpot air amount (ISCDPT) value is determined regardless of the coolant temperature, and more fuel is supplied at a lower temperature, the noise caused by the engine overshoot is only increased. In addition, there is a problem that the amount of harmful gases is also increased.

The present invention has been made to solve the above-mentioned problems of the prior art, by controlling the amount of dashpot air in accordance with the cooling water temperature (WPS) as well as the TPS noise and harmful gases due to the engine overshoot (Overshoot) at low temperatures It is an object of the present invention to provide a method for controlling the tail pot air quantity tailing that can reduce the amount of carbon dioxide generated.

1 is a view showing a state of air loss in the conventional dash port operation,

2 is a cross-sectional view schematically showing the air amount loss state when applying the dash port air amount tailing control method according to the present invention,

Figure 3 is a flow chart schematically showing the control flow of the dash port air mass tailing control method according to the present invention.

* Explanation of symbols for main parts of the drawings

IDL: Idle ISCDPT: Dashport Air Volume

ISCBAS: Kids Basic Air Volume TPS: Throttle Dog

WTS: Cooling water temperature A, K _f : Reduction constant

ISCDPT1 (TPS): Air volume duty value according to throttle opening

The present invention provides a dash port air amount tailing control method for gradually reducing the air amount by a dash pot at the time of release after an acceleration pedal tip (Tip-in). If this is determined, the air volume duty value is reduced at a constant rate determined according to the TPS value until the air pressure duty value becomes a constant value (ISCDPT1), and after that, the dash port air volume is reduced at a constant magnification with respect to the air volume at the previous point, but the magnification ratio is cooling water temperature Characterized in that determined according to the table determined according to.

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

In the dashpot air amount tailing control method of the present invention, as shown in FIG. 2 and FIG. 3, the method determines whether the vehicle enters an idle state and compares the dashpot air amount (ISCDPT) value with the idle basic air amount (ISCBAS) value. Through the idle control, detecting the throttle opening (TPS) and the cooling water temperature (WPS), and maintaining the dashed air flow (ISCDPT) value up to the air volume duty value (ISCDPT1) determined according to the throttle opening (TPS). and the step of reduction in the ratio, cooling water temperature (WTS) loss constant K _f is determined; and dashpot air amount (ISCDPT) value until it the value children basic air quantity (ISCBAS) the loss constant according to the according to the K _f It consists of a step of losing weight at a constant magnification.

In this case, the weight loss constant K _f is a value determined by an experiment so as to achieve a stable weight loss and stored in a table in the ECU.

The dashpot air amount tailing control method of the present invention configured as described above is a method of controlling the amount of air supplied to the engine by the dash pot until the engine is switched from the accelerated state to the idle state.

When the driver releases the accelerator pedal with the accelerator pedal tip-in in order to decelerate while driving, the engine switches to the idle state and accordingly the throttle opening amount TPS ISCDPT) is determined. At this time, if the dashed port air volume (ISCDPT) is not larger than the idle basic air volume (ISCBAS), the IDL control is immediately performed. ISCDPT) will be gradually reduced.

First, the throttle opening (TPS) and cooling water temperature (WTS) are detected to reduce the ISCDPT at a rate until the ISCDPT is less than or equal to ISCDPT1. If ISCDPT is less than ISCDPT1, the reduction factor K _f is determined according to the coolant temperature, and the weight is continuously reduced until ISCDPT is less than or equal to ISCBAS. At this time, the ISCDPT multiplies the immediately preceding ISCDPT by the reduction constant K _{f so} that the ISCDPT is reduced by a certain magnification.

After that, when the ISCDPT is less than IDCBAS, the operation of the dash port is terminated, and only the idle air amount is supplied, thereby allowing the engine to switch to the idle state naturally.

As described above, in the dashpot air amount tailing control method of the present invention, the dashpot air amount tailing is reduced at a constant rate until a certain amount is reached, and thereafter, it is reduced at a constant magnification using a weight loss constant determined according to the cooling water temperature. And there is an advantage that can reduce the amount of excessive engine noise and harmful gas generated during cold operation.

Claims (1)

(Correct) In the desiccant air volume tailing control method of gradually reducing the air volume by the dash pot at the time of release after the accelerator pedal tip-in, After the deceleration judgment, if the dash port air volume value is determined, the air volume duty value is reduced by a certain ratio until the air volume duty value becomes the value determined according to the TPS value. A dash port air mass tailing control method, characterized in that configured to be determined according to the table determined according to the cooling water temperature.