KR100302773B1 - Device and method for controlling ignition time - Google Patents

Abstract

PURPOSE: A pressure within a combustion chamber of engine is sensed, and the combustion ratio is outputted by a formula set in a memory table of a controlling portion. An ignition time is determined so that an optimum crank angle at the point of 50 percent of the combustion ratio is maintained, thereby sensing the optimum ignition time. CONSTITUTION: A controlling device of ignition time comprises an automobile information sensing portion(10), a pressure sensing portion(20), a controlling portion(30), an actuator(40). The automobile information sensing portion(10) senses the state of the driving automobile and outputs corresponding signal. The pressure sensing portion(20) senses the pressure within the combustion chamber and outputs corresponding signal. The controlling portion(30) analyzes the signals of the automobile information sensing portion(10) and the pressure sensing portion(20) and outputs a control signal to control ignition time of the engine. A burn rate is output by the pressure of the combustion chamber. If it is decided that a certain angle of the crank is maintained, it is considered to be optimum ignition time, there by outputting control signal for ignition.

Description

Ignition time control device and control method

The present invention relates to an ignition timing control device and a control method, and more particularly, to control the ignition timing to improve engine performance by igniting the engine at an optimal ignition timing (MBT) regardless of combustion conditions and operating conditions of the engine. An apparatus and a control method thereof are provided.

In general, the ignition timing control device is to effectively control the maximum combustion pressure point that varies depending on the engine speed and the load on the engine, so that the best engine performance can be exhibited. If it is described as follows.

In order to adjust the ignition timing of the vehicle traveling to a predetermined destination, the vehicle state detection unit 100 detects the state of the engine, that is, the engine speed, the intake air amount, the temperature of the cooling water, and the like, and controls a predetermined electrical signal corresponding thereto. Output to 200.

The control unit 200 analyzes a signal applied from the vehicle state detection unit 100 to detect an engine state, and then detects an optimum ignition time set in the memory 210 table according to the detected engine state. Outputs a control signal to the actuator (300).

In the memory 210 table of the controller 200, an optimum ignition timing for displaying the maximum engine performance under all engine operating conditions detected through experiments in the engine development stage is set.

The actuator 300 ignites the mixer sucked into the combustion chamber according to a signal applied from the control unit 200.

As described above, conventionally, when developing an engine, an optimum ignition time is found in all operating conditions and set in the memory table of the control unit. Therefore, a lot of tests are required when developing the engine, and the set value set in the memory table of the control unit is required. According to the control of the injection timing, there is a problem that the optimum ignition timing cannot be actively found even if the engine state changes due to the aging of the engine.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to detect a pressure in an engine combustion chamber and calculate a combustion ratio according to a proportional formula set in a memory table of a controller, wherein the calculated combustion ratio is about 50% of the calculated combustion ratio. The crank angle detected at the point corresponding to% is constant even when the engine is changed by controlling the ignition timing so that the crank angle, which is the optimum ignition timing irrespective of the combustion state and independent of the engine operating conditions, is maintained. This is to detect the optimal ignition timing and to reduce the development cost when developing the engine.

1 is a block diagram showing an ignition timing control apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart of an embodiment for executing the ignition timing control method in the embodiment of the present invention of FIG.

3A is a graph showing the pressure in the combustion chamber.

3B is a graph showing the pressure in the combustion chamber as the combustion ratio.

4 is a block diagram showing a conventional ignition timing control device.

The present invention for achieving the above object is a vehicle information detection means for detecting information of the vehicle being driven;

Pressure detecting means for detecting a pressure in the combustion chamber;

The combustion ratio is calculated according to the pressure in the combustion chamber, and when it is determined that the position angle of the crank corresponding to a certain percentage of the combustion ratio is maintained at a constant angle, it is determined that the combustion is ignited at the optimum ignition timing, and a control signal for ignition operation is obtained. Control means for outputting;

It consists of an actuator for spark ignition of the mixer sucked in the combustion chamber in accordance with the signal applied from the control means.

Specifically, the control means detects the pressure in the combustion chamber and calculates the combustion ratio according to the proportional formula set in the memory table, and determines that the position angle of the crank corresponding to a certain percentage of the combustion ratio is maintained at a constant angle. If it is judged that the ignition is ignited at the ignition timing, and the position angle of the crank corresponding to a certain percentage of the combustion ratio is determined to be higher than the predetermined angle, the ignition timing is perceived at a certain angle, If judged to be below a certain angle, advance the ignition timing at a certain angle.

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

As can be seen in Figure 1 the ignition timing control apparatus according to an embodiment of the present invention comprises a vehicle information detector 10, pressure detector 20, the control unit 30, the actuator 40, The vehicle information detector 10 detects a state of a vehicle in operation and outputs a predetermined electrical signal corresponding thereto.

The pressure detector 20 detects a pressure in the combustion chamber that is fluid according to the state of the vehicle being driven and outputs a predetermined electrical signal corresponding thereto.

The controller 30 analyzes signals applied from the vehicle information detector 10 and the pressure detector 20 and outputs a control signal for adjusting the ignition timing of the engine.

For example, the control part 30 calculates the combustion ratio which shows the period in which combustion takes place according to the proportional formula set to the memory table for the pressure detected by the pressure detection part 20 like FIG. 3A.

At this time, the combustion ratio calculated according to the proportional expression can be represented as shown in Figure 3b, and if the crank angle of the point corresponding to about 50 [%] of this combustion ratio corresponds to about 8 degrees ATDC (After Top Dead Center), the combustion state is It is judged as the optimum ignition timing irrespective of the engine operating condition.If the crank angle is above or below ATDC 8 degrees or lower, the ignition timing is delayed or advanced so that the crank angle at the point corresponding to about 50% of the combustion ratio is always Outputs a control signal to maintain approximately ATDC 8 degrees.

Specifically, the energy generated by combustion at each crank angle can be calculated from the pressure data in the combustion chamber (FIG. 3A), and the total energy generated during the combustion period is obtained by integrating all the generated energy at each crank angle.

The combustion ratio at any crank angle can be defined as "generating energy up to a given crank angle / total generating energy", which varies from 0 to 1 depending on the crank angle (Fig. 3b).

The actuator 40 analyzes the signal applied from the controller 30 to ignite the mixer sucked into the combustion chamber.

The operation of the ignition timing control device in the present invention having the function as described above will be described with reference to FIG. 2 as follows.

In order to determine the ignition timing of the vehicle traveling to a predetermined destination, the controller 30 analyzes signals applied from the vehicle state detector 10 and the pressure detector 20 to determine the driving information of the vehicle, that is, the intake air amount, the crank angle, and the coolant. Temperature, the pressure in the combustion chamber, and the like are detected (step 110).

The burn rate, which represents the period in which combustion occurs, is calculated according to the proportional expression set in the memory table of the controller 30 by the pressure in the combustion chamber detected as shown in FIG. 3A at step 110, as shown in FIG. 3B. (Step 120).

The crank angle angle corresponding to the point of 50% of the combustion ratio calculated in the above (step 120) is detected (step 130), and it is determined whether the detected crank angle is a constant angle, for example, 8 degrees ATDC (step 140). ).

If it is determined in step 140 that the crank angle is maintained at a constant angle, it is judged that the combustion is performed at the optimum ignition timing regardless of the combustion state and irrespective of the engine operating conditions, and iterates according to the program set in the memory table of the controller. Then, the ignition timing control operation is executed, and if it is determined that the crank angle is not maintained at a constant angle, it is determined whether the detected crank angle is detected at a predetermined angle or more (step 150).

If it is determined in step (step 160) that the crank angle is detected at a predetermined angle or more, the control unit 30 outputs a control signal to the actuator 40 for retarding the ignition timing by a predetermined angle, for example, about 1 degree (step 160). ).

The actuator 40 ignites the flame by retarding the mixer sucked into the engine combustion chamber by one degree according to a signal applied from the controller 30.

If the crank angle is not detected at a predetermined angle or more in step (step 160), it is determined that the crank angle is detected at a predetermined angle or less, and a control signal for advancing the ignition timing to a predetermined angle, for example, about 1 degree, is supplied to the actuator 40. It outputs (step 170).

The actuator 40 advances the mixer sucked into the engine combustion chamber by about 1 degree according to the signal applied from the controller 30 to ignite the flame.

As described above, the present invention detects the pressure in the engine combustion chamber and calculates the combustion ratio according to the proportional formula set in the memory table of the controller, and detects the crank angle at a point corresponding to about 50% of the calculated combustion ratio. By controlling the ignition timing to maintain this constant angle, that is, the crank angle, which is the optimum ignition timing irrespective of the combustion state and irrespective of the engine operating conditions, the optimum ignition timing can be actively detected even if the engine status changes. Therefore, it is possible to reduce the development cost when developing the engine because a lot of tests are not necessary to find the optimum ignition timing.

Claims (4)

Vehicle information detecting means for detecting information of a driven vehicle; Pressure detecting means for detecting a pressure in the combustion chamber; The combustion ratio is calculated according to the pressure in the combustion chamber, and when it is determined that the position angle of the crank corresponding to a certain percentage of the combustion ratio is maintained at a constant angle, it is judged that it is ignited at the optimum ignition timing, and a control signal for ignition operation is obtained. Control means for outputting; An ignition timing control device comprising: an actuator for spark igniting a mixer sucked into a combustion chamber according to a signal applied from the control means. Calculating a combustion ratio according to detecting the pressure in the combustion chamber; If the position of the crank corresponding to a certain percentage of the combustion ratio calculated in the above step is detected, and the position angle of the crank corresponding to the predetermined percentage of the combustion ratio is maintained at a constant angle, regardless of the combustion state and regardless of the engine operating conditions Determining the state of ignition at an optimum ignition timing; Ignition timing control method comprising the step of flame igniting the mixer sucked into the combustion chamber at the optimum ignition timing. The ignition timing control method according to claim 2, further comprising: retarding the ignition timing at a predetermined angle when it is determined that the position angle of the crank corresponding to a predetermined percentage of the combustion ratio is equal to or greater than the predetermined angle. The ignition timing control method according to claim 2, further comprising advancing the ignition timing at a predetermined angle when it is determined that the position angle of the crank corresponding to a predetermined percentage of the combustion ratio is equal to or less than the predetermined angle.

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