KR20030030213A - Method of controlling an igniting time for an engine - Google Patents

Abstract

PURPOSE: An ignition timing control method for a vehicle engine is provided to achieve improved performance of vehicle by enhancing hill-climbing ability through the effective control of ignition timing. CONSTITUTION: An ignition timing control method comprises a first step(S100,S110) of judging whether the throttle opening angle is lower than a reference level; a second step(S120,S130) of measuring engine RPM and calculating filling efficiency of intake air, and calculating a basic ignition timing in accordance with the result of measurement and calculation, if it is judged in the first step that the throttle opening angle is lower; a third step(S140 to S170) of calculating the final ignition timing by calculating an ignition timing delay correction value caused due to the intake-air temperature and coolant temperature, ignition timing delay correction value for controlling exhaust air temperature and ignition timing delay correction value for cases of knock and subtracting the calculated value from the basic ignition timing calculated in the second step, and controlling the ignition timing; a fourth step(S111,S112) of judging whether engine RPM is larger than the engine RPM of the previous sampling, and whether the current engine RPM is larger than 2000RPM, if it is judged in the first step that the throttle opening angle is lower, and returning to the second step if engine RPM is larger; and a fifth step(S113 to S116) of turning off the air conditioner switch, measuring engine RPM and calculating filling efficiency of intake air, calculating a basic ignition timing in accordance with the result of measurement and calculation, and controlling ignition timing, if conditions in the fourth steps are not satisfied.

Description

Control method of ignition timing of car engine {METHOD OF CONTROLLING AN IGNITING TIME FOR AN ENGINE}

The present invention relates to a method for controlling the ignition timing of an automobile engine, and more particularly, to a method for controlling the ignition timing of an automobile engine capable of improving the overall vehicle performance by improving the climbing capability through effective ignition timing control.

An engine used as a power source of a vehicle receives fuel and air into a combustion chamber and compresses and explodes it, thereby reciprocating the piston up and down, and converting its up and down reciprocating motion into a rotational motion as a crank mechanism to obtain rotational power.

The ignition timing, which induces the explosion of compressed gas during operation of the engine, is one factor that has a great influence on the engine output.

Accordingly, the ignition timing control in the automobile engine must be precisely controlled, and the control of the ignition timing varies greatly depending on the current driving state of the engine and the vehicle.

Considering the conventional ignition timing control in consideration of this point, as shown in Figure 3, the calculation of the filling efficiency of the intake air based on the measurement of the engine RPM and the signal input from the air flow sensor (S200), based on this basic ignition Set the time (S210).

In order to prevent knock generation, an ignition timing perception correction value is calculated by intake air temperature and cooling water temperature (S220), and an ignition timing perception correction value for controlling exhaust temperature control is calculated to satisfy durability of the catalyst (S230). When the knock occurs, the ignition timing perception correction value is calculated (S240), the calculated values are subtracted from the basic ignition timing, and the final ignition timing is calculated (S250).

However, in the case of controlling the ignition timing in the above manner, it may be a reasonable control method in general flat driving, but it is impossible to climb due to the excessive ignition timing in the slope of about 20% in summer. There is a problem that occurs.

Specifically, when climbing on a slope in summer, there may be a case of waiting for a few minutes or longer for a few minutes after stopping due to traffic jams, etc. At this time, knocking occurs when the intake air temperature is higher than 70 ° C and the cooling water temperature is higher than 90 ° C. When the ignition timing for blocking is more than 3 ° ~ 7 °, in some cases, when the knock sensor senses knocking, the additional 5 ° is perceived. There is a concern that a problem may occur, and in practice, such a problem often occurs.

As a result, the performance and merchandise of the vehicle is lowered due to the lack of climbing performance of the vehicle, and additional costs are required, resulting in economic losses.

Therefore, the present invention has been invented to solve the above problems, and an object of the present invention is to provide an ignition timing control method of an automobile engine capable of improving overall vehicle performance by improving ignition capability with effective ignition timing control. .

1 is a system configuration for operating the present invention.

2 is an operation flowchart according to the present invention.

3 is an operation flowchart of a conventional control method.

In order to realize this, the present invention determines the opening angle of the throttle valve in the state where the speed change stage is 1 speed while the vehicle is running, and when the opening angle increases to a normal engine speed from the reference value or less, it is determined by the ignition timing correction value of the engine. Ensure normal ignition control,

If the engine speed is judged to be lower than the reference value when the throttle opening angle is higher than the reference value, the vehicle is judged to run as a gradient and completely ignores the ignition timing correction factor while minimizing the engine load and controls the ignition timing to the basic ignition timing. Provides a method for controlling the ignition timing of the engine.

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

1 is a configuration diagram of a system for controlling the ignition timing according to the present invention. The detection means includes a shift stage detection sensor 2 for detecting a shift stage of a current transmission, and a throttle linked to an accelerator pedal. A throttle opening angle sensor 4 for detecting the opening angle of the valve, an engine RPM sensor 6 for detecting the output rotational speed of the engine, and an air flow sensor 8 for calculating the intake air amount of the intake system; Is done.

The various signals detected by the detecting means are input to the electronic control unit (ECU), and compared with the data already input to control the ignition system 10 and the air conditioner 12.

Looking at the process of ignition timing control using the above system, it is controlled by the operation flow as shown in FIG.

First, it is determined whether the current shift stage is shifted to the first stage through the shift stage detecting sensor 2 (S100), and if the shift stage is determined to be the first stage, the current throttle opening angle from the throttle opening angle sensor 4 ( It is determined whether the TPS) is less than or equal to the reference value TPS_SLOP: approximately 60 ° (S110).

If it is determined in step S110 that the throttle opening angle is equal to or less than the reference value, the filling efficiency of the intake air is calculated based on the measurement of the engine RPM and the signal input from the air flow sensor 8 (S120), and based on the basic ignition timing Set (S130).

In order to prevent the occurrence of knock, the ignition timing perception correction value is calculated by intake air temperature and cooling water temperature (S140), and the ignition timing perception correction value for controlling the exhaust temperature in order to satisfy the durability of the catalyst is calculated (S150). When the knock occurs, the ignition timing perception correction value is calculated (S160), and the calculated ignition timing is controlled after subtracting these calculated values from the basic ignition timing to calculate the final ignition timing (S170).

However, if it is determined in step S110 that the throttle angle is greater than or equal to the reference value, it is determined whether the current engine speed RPM_NOW is greater than the rotation speed RPM_PREV in all sampling (S111). If it is determined that the RPM_NOW) is greater than 2000 RPM (S112), the process enters the step S120.

That is, in steps S111 and S112, the engine speed does not increase even when the accelerator pedal is depressed for starting, and thus, it is determined whether or not the vehicle is currently driving on the gradient road.

If the conditions in the steps S111 and S112 are not satisfied, it is determined that the vehicle is currently driving on the gradient road, and in this case, it is determined whether the air conditioner corresponding to the engine load is operated (S113).

If it is determined in step S113 that the air conditioner is in the ON state, the air conditioner switch switch is controlled off (S114), as in steps S120 and S130, the intake air based on the measurement of the engine RPM and the signal input from the air flow sensor 8 Calculate the filling efficiency of (S115), and set the basic ignition timing based on this, and then control the ignition timing of the ignition system according to its basic igniter time (S116).

In other words, if it is recognized that it is impossible to climb due to the fact that the engine speed of the vehicle does not increase in the state that it is recognized as the gradient road, the basic ignition timing when the air conditioner switch corresponding to the engine load is turned off and all the ignition timing correction values of the engine are removed By applying this will maximize the performance of the engine.

When the basic ignition timing is applied as described above and the engine speed is increased and the engine speed becomes 2000 RPM or more, the acceleration returns to the normal ignition timing.

As described above, according to the present invention, by controlling the ignition timing in accordance with the engine load in a situation where the frequency is not so high under adverse conditions such as driving on a climbing road in summer, the problem of climbing performance can be improved without changing hardware. It is an invention that can contribute to the improvement of the merchandise by improving the performance of the vehicle.

Claims (3)

The opening angle of the throttle valve is judged in a state where the gear shift stage is 1 speed while the vehicle is running, and when the opening angle increases to a normal engine speed from the reference value or less, normal ignition control is performed by the engine ignition timing correction value. If the engine speed is judged to be lower than the reference value when the throttle opening angle is higher than the reference value, it is judged that the vehicle is driven in the gradient, and the ignition timing control is performed as the default ignition timing while ignoring the ignition timing correction factor while minimizing the engine load. An ignition timing control method of an automobile engine, characterized in that. 2. The method according to claim 1, wherein the air conditioner is turned off as the engine load element. A first step of determining whether the throttle opening angle is equal to or less than a reference value in a state where the current shift stage is in the first speed; A second step of calculating a basic ignition timing based on the measurement of the engine RPM and the filling efficiency of the intake air of the intake system when it is determined that the throttle opening angle is equal to or less than the reference value in the first step; After performing the second step, the ignition timing perception correction values due to the intake air temperature and the cooling water temperature, the ignition timing perception correction value for controlling the exhaust temperature, and the ignition timing perception correction value at the time of knock generation are calculated and the calculated values are calculated. A third step of controlling the ignition timing after calculating the final ignition timing by subtracting from the basic ignition timing; When the throttle opening angle is greater than or equal to the reference value in the first step, it is determined whether the engine speed is greater than the rotation speed in the previous sampling and whether the current engine speed is greater than 2000 RPM. Steps; If the condition of the fourth step is not satisfied, the air conditioner is switched off, and the engine ignition timing control is performed by calculating the basic ignition timing based on the measurement of the engine RPM and the calculation of the filling efficiency of the intake air of the intake system. Ignition timing control method of a car engine, characterized in that consisting of five steps.