KR20010044979A - Method for correcting a knocking according to a temperature of an intake air - Google Patents

Abstract

PURPOSE: A method for compensating knocking according to intake temperature is provided to optimize performance of a manual transmission car by applying control logic for preventing knocking according to the manual transmission car and an automatic transmission car. CONSTITUTION: A method for compensating knocking according to intake temperature includes the steps of setting optimal ignition timing in an engine according to data input from a sensor, calculating spark advance compensating function, comparing input cooling water temperature and intake temperature with operation setting cooling water temperature and operation setting intake temperature, determining whether a transmission is automatic or manual if cooling water temperature and intake temperature are higher than operation setting cooling water temperature and operation setting intake temperature, multiplying compensating map according to cooling water temperature and intake temperature and transmission compensating map according to engine rotational frequency and air amount to compensate spark advance, and setting ignition timing according to the spark advance compensation.

Description

Method for correcting a knocking according to a temperature of an intake air}

The present invention relates to an intake system of an automobile, and more particularly, by applying the frequency of knocking of the vehicle according to the intake of the engine and the cooling water temperature of the engine according to the shifting method of the vehicle, the performance of the manual shift vehicle can be optimized. It relates to a knocking correction method according to the intake temperature.

In general, the intake system of an automobile is such that air passing through the air cleaner as shown in FIG. 1 pushes the flap 103 (measuring plate or vane) of the air flow meter 102 and opens the throttle valve 104. The amount of air depending on the degree is sucked into the combustion chamber.

The throttle chamber 105 and the air flow meter 102 have a bypass passage 106 of air, and each passage is provided with an adjusting screw 107 for adjusting the bypass air amount by changing the passage area. Therefore, since a small amount of air is supplied through the bypass passage 106 even when the throttle valve 104 is completely closed, such as when the engine is idle, engine rotation can be maintained. Bypass air in the throttle chamber 105 determines the amount of intake air when the throttle valve 104 is completely closed, and the adjustment screw 107 provided therein is an idle adjustment screw.

In addition, since the amount of air passing through the bypass passage 106 of the air flow meter 102 is very narrow in comparison with the intake flap passage of the engine, when the engine rotates at high speed and the amount of intake air increases, the bypass passage is It does not affect the opening of the flap very much. Therefore, the adjustment screw 107 provided in this part adjusts the opening degree of a flap at low speed rotation (idle rotation etc.) with a small amount of intake air. If the flap opening degree is changed, the injection amount of fuel is changed, and as a result, the air-fuel ratio of the mixer at idle is changed.

If the air-fuel ratio changes, the CO concentration changes, resulting in a CO concentration adjusting screw at idle. Moreover, another system of air passages are provided which bypass the front and rear of the throttle valve 104, so that the air regulator 108, or the air valve, automatically adjusts the cross-sectional area of the passage in the center of the passage.

The air regulator 108 is determined in its open state depending on the warm-up state of the engine. That is, when the engine is cold, the opening amount is increased (and thus the rotation of the engine is increased), and when the temperature is higher than or equal to a certain temperature, the air regulator 108 is closed, and the bypass tow 106 is closed to lower the engine rotation.

On the other hand, the control system of the engine is the engine speed detected from the ignition coil 111, the intake air amount and intake temperature from the air flow meter 102, the start signal from the ignition switch 114, the throttle valve as shown in FIG. Information about the opening degree of the throttle valve 104 from the switch 112 and the coolant temperature from the water temperature sensor 113 is input to the central control unit 110. According to this input information, the central control unit 110 calculates the optimum fuel injection amount according to the input program, determines the opening time of the fuel injector, and commands and processes the fuel injector.

However, the conventional vehicle has a problem in that the frequency of knocking in the engine increases and the knocking level also increases as the temperature of the intake ondome and the coolant increases, and to compensate for this, the basic ignition timing is delayed according to the intake temperature and the coolant temperature. However, this tends to degrade the performance of the vehicle, and the same ignition delay is applied by using the same control logic of the manual transmission vehicle and the automatic transmission vehicle, so that the manual transmission vehicle has relatively high power performance. Since the loss is large and the load of the automatic transmission vehicle is greater than that of the manual transmission vehicle, there is a problem that knocking frequency of the automatic transmission vehicle is higher than that of the manual transmission vehicle.

Accordingly, an object of the present invention is to apply the control logic for preventing knocking according to the intake air temperature and the coolant temperature by distinguishing the manual and automatic transmission vehicles, thereby improving the performance of the manual transmission vehicle by applying an ignition delay suitable for the manual transmission vehicle. It is to provide a knocking correction method according to the intake temperature that can be optimized.

1 is a view schematically showing the structure of an intake system of a typical vehicle.

FIG. 2 shows a control system for the intake system of the motor vehicle shown in FIG. 1. FIG.

Figure 3 is a flow chart for performing the knocking correction method according to the intake air temperature in accordance with the present invention.

4A and 4B are views for explaining a map according to the intake air temperature and the engine coolant temperature, and a map according to the engine speed and the intake air amount.

(Explanation of symbols for the main parts of the drawing)

110: central control unit 111: ignition coil

112: throttle valve switch 113: water temperature sensor

114: throttle valve 115: ignition coil

The object as described above comprises the steps of: setting an optimum ignition timing in the engine in accordance with data input from a sensor and calculating a forward correction function; Comparing the input coolant temperature and the intake temperature with the operating set cooling water temperature and the operating set intake temperature; When the coolant temperature and the intake temperature are higher than the set coolant temperature and the set intake temperature, determining whether the transmission is automatic or manual; Performing advancing correction according to a value obtained by multiplying the correction map according to the coolant temperature and the intake temperature and the correction map for each transmission according to the engine speed and the amount of air; It is achieved by the knocking correction method according to the intake air temperature according to the invention, characterized in that it comprises the step of setting the ignition timing in accordance with the advance correction.

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

3 is a flowchart for performing a knocking correction method according to the intake air temperature according to the present invention.

Before describing an embodiment of the present invention, since the control system for the intake machine of the motor vehicle shown in FIG. 2 can be applied to the present invention, the components shown in FIG. 2 are also used in the embodiment of the present invention.

As shown in FIG. 3, the knocking correction method according to the present invention is different from the engine speed detected from the ignition coil 111 and the suction from the air flow meter 102, as shown in FIG. 2. Information about the amount of air and the intake temperature, the start signal from the ignition switch 114, the opening degree of the throttle valve 104 from the throttle valve switch 112, and the coolant temperature from the water temperature sensor 113 are sent to the central control unit 110. The central controller 110 sets the optimum ignition timing in the engine according to the data input from the sensor, and calculates the advance correction function (S1).

The input coolant temperature and intake temperature are then compared with the operating set coolant temperature and the operating set intake temperature to delay ignition and prevent knocking when the input coolant temperature and intake temperature are higher than the set intake temperature and engine coolant temperature. (S2). In the above step, when the input coolant temperature and the intake temperature are higher than the set coolant temperature and the intake temperature, the following steps are performed, and when not, the performance of the method is terminated.

In this step, if the coolant temperature and the intake temperature are higher than the set coolant temperature and the set intake temperature, it is determined whether the transmission of the vehicle is automatic or manual (S3), and when the transmission is the automatic transmission, the coolant temperature shown in Fig. 4A. And advancing correction according to the value obtained by multiplying the correction map IGCTAIR according to the intake air temperature, the engine speed for the automatic transmission according to FIG. 4B, and the correction map IGRMTAT according to the air amount (S4).

On the other hand, in the case of the manual transmission, advance correction is performed according to the value obtained by multiplying the correction map IGCTAIR according to the coolant temperature and the intake temperature, the engine rotation speed for the manual transmission, and the correction map IGRMTMT according to the air amount (S5). Finally, the ignition timing is set according to the advance correction (S6).

According to the present invention as described above, by distinguishing between manual shift and automatic shift, the ignition delay logic is applied according to the intake temperature and the coolant temperature, and according to the rotational speed and the intake air amount of the engine, thereby the manual shift and the automatic shift The performance of the vehicle can be improved.

Claims (1)

Setting an optimum ignition timing in the engine according to the data input from the sensor, and calculating the advance correction function; Comparing the input coolant temperature and the intake temperature with the operating set cooling water temperature and the operating set intake temperature; When the coolant temperature and the intake temperature are higher than the set coolant temperature and the set intake temperature, determining whether the transmission is automatic or manual; Performing advancing correction according to a value obtained by multiplying the correction map according to the coolant temperature and the intake temperature and the correction map for each transmission according to the engine speed and the amount of air; And setting the ignition timing according to the advance angle correction.