KR100372712B1 - Method for controlling ignition advance angle by ionization current - Google Patents

Method for controlling ignition advance angle by ionization current Download PDF

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Publication number
KR100372712B1
KR100372712B1 KR1019960064206A KR19960064206A KR100372712B1 KR 100372712 B1 KR100372712 B1 KR 100372712B1 KR 1019960064206 A KR1019960064206 A KR 1019960064206A KR 19960064206 A KR19960064206 A KR 19960064206A KR 100372712 B1 KR100372712 B1 KR 100372712B1
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South Korea
Prior art keywords
ionization current
waveform
ignition
ionization
explosion
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KR1019960064206A
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Korean (ko)
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KR19980045953A (en
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최승택
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기아자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/1502—Digital data processing using one central computing unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current
    • F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits

Abstract

PURPOSE: A method is provided to reduce costs and allow the method to be applied to the measurement of combustion characteristics including an ignition time feedback control and air-fuel ratio control. CONSTITUTION: An ionization current measurement unit(3) is connected to a secondary ignition coil(2) of a spark plug(1). The ionization current waveform obtained by measuring the ionization waveform in the combustion chamber detected through the secondary coil is divided into a waveform section in case where a strong excitation power is generated to the ignition coil, a waveform section in case where ions are generated in the combustion chamber by an explosion, and a waveform section which is output by the influence of the molecular binding after explosion. The values obtained by measuring the sections are transmitted to an ECU(4), and the ECU compares and analyzes the ionization current waveforms. An ignition advance angle is controlled by the map value preset in accordance with the analyzed ionization current waveform.

Description

이온화 전류에 의한 점화진각 제어방법Ignition advance control method by ionization current

스파크 플러그를 프로브로 하여 점화코일의 저전압측에 흐르는 전류를 측정하여 이를 ECU 에 피드백시켜서 점화시기를 제어하는 이온화 전류에 의한 점화진각 제어방법에 관한 것이다.The present invention relates to a control method of ignition advance by ionization current which controls the ignition timing by measuring a current flowing in the low voltage side of the ignition coil using a spark plug as a probe and feeding it back to the ECU.

[발명이속하는기술분야및그분야의종래기술][Technical Field to which the Invention belongs and Conventional Technology in the Field]

일반적으로 가솔린 엔진에서 점화시기는 엔진의 효율을 경정하는 중요 팩터이며 개발시 표준화 된 데이터에 의해 제어된다. 그러나 엔진의 효율을 더 향상시키기 위해서는 RPM, 부하, 공연비, 냉각수온, 배기가스 재순환, 습도 등 엔진 조건에 따라 가변적으로 점화시기를 제어하는 것이 필요하며 그 한 방법으로서 실린더내에 압력센서를 설치하여 점화시기를 제어하는 방식이 사용되기도 한다. 그렇지만 이러한 방법은 연소효율이 향상되는 장점도 있지만 별도 센서의 부착, 실린더 별로 하부 홀 가공 등 비용이 많이 소요되어 실용예는 별로 없다.In general, in gasoline engines, the ignition timing is an important factor for determining the efficiency of the engine and is controlled by data standardized at development. However, in order to further improve the efficiency of the engine, it is necessary to control the ignition timing in accordance with the engine conditions such as RPM, load, air-fuel ratio, cooling water temperature, exhaust gas recirculation, and humidity. Sometimes a method of controlling timing is used. However, this method also has the advantage of improving the combustion efficiency, but it requires a lot of costs, such as the attachment of a separate sensor, the bottom hole processing for each cylinder, so there are few practical examples.

본 발명의 목적은 상기와 같은 문제점을 해결하기 위하여 고온, 고압에서 실린더 연소실내에 많은 이온이 발생하는 원리를 이용하여 스파크 플러그를 프로브로하여 점화코일의 저전압측에 흐르는 전류를 측정하여 이를 ECU 에 피드백시켜서 점화시기를 제어하는 이온화 전류에 의한 점화진각 제어방법을 제공하고자 하는 것이다.An object of the present invention is to measure the current flowing to the low voltage side of the ignition coil by using a spark plug as a probe using a principle that generates a lot of ions in the cylinder combustion chamber at high temperature, high pressure in order to solve the problems described above to the ECU It is an object of the present invention to provide a control method of ignition advance by ionization current which controls the ignition timing by feeding back.

본 발명의 목적을 달성하기 위하여 이온화 전류에 의한 점화진각 제어방법은 이온화 전류 측정장치에 의해서 스파크 플러그를 프로브로 사용하여 연소실 내의 이온화 파형을 측정하고 얻어진 이온화 전류파형을 점화를 위해 점화코일에 강한 여기전력을 발생시켰을 때의 파형구역, 폭발에 의해 연소실내에 많은 이온이 발생한 파형구역 및 폭발 이후 분자결합의 영향으로 출력된 신호파형구역으로 구분하며 측정값을 ECU 에 보내고 ECU 는 미리 설정된 맵값에 의해 점화진각을 제어하여 이루어진다.In order to achieve the object of the present invention, the method for controlling the ignition advance by ionization current uses a spark plug as a probe by means of an ionization current measuring device to measure the ionization waveform in the combustion chamber, and the obtained ionization current waveform is subjected to strong excitation to the ignition coil for ignition. The waveform is divided into the waveform area when power is generated, the waveform area where many ions are generated in the combustion chamber by the explosion, and the signal waveform area output by the effect of molecular bonding after the explosion, and the measured value is sent to the ECU. This is achieved by controlling the ignition advance.

도 1은 본 발명의 이온화 전류 측정시스템의 구성을 도시하는 도면BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the structure of the ionization current measuring system of this invention.

도 2는 본 발명의 이온화 전류파형을 도시하는 도표2 is a diagram showing the ionization current waveform of the present invention.

* 도면의 부호에 대한 설명 *Explanation of symbols in the drawings

1: 스파크 플러그 2: 2차 점화코일1: spark plug 2: secondary ignition coil

3: 이온화 전류 측정장치 4: ECU3: ionization current measuring device 4: ECU

5: 1차 점화코일5: primary ignition coil

본 발명을 첨부된 도면을 참조하여 하기에 설명한다.The present invention is described below with reference to the accompanying drawings.

도1에는 본 발명의 이온화 전류 측정시스템의 구성이 도시되는데, 스파크 플러그(1)의 2차 점화코일(2)에는 이온화 전류 측정장치(3)가 연결되고 이온화 전류측정장치(3)는 ECU(4)에 연결되어 피이드백 신호를 보낸다. ECU(4)는 1차 점화코일(5)에 연결되어 1차 점화코일(5)을 제어한다.1 shows a configuration of an ionization current measuring system of the present invention, in which the secondary ignition coil 2 of the spark plug 1 is connected with an ionization current measuring device 3 and the ionizing current measuring device 3 is an ECU ( 4) to send a feedback signal. The ECU 4 is connected to the primary ignition coil 5 to control the primary ignition coil 5.

본 발명에서 사용된 이온화 전류 측정장치는 시중에서 구할 수 있는 장치이며 스파크 플러그(1)를 프로브로 사용하여 연소실 내의 이온화 파형을 측정한다. 도2에는 본 발명의 이온화 전류 측정장치에 의해서 얻어진 이온화 전류파형이 도시되는데, 구역① 에 표시된 점화상태는 점화를 위해 점화코일에 강한 여기전력을 발생시켰을 때의 파형이며, 구역② 에 표시된 플레임 프론트 상태는 폭발에의해 연소실내에 많은 이온이 발생한 파형이며, 구역③ 에 표시된 포스트 플레임 상태는 폭발 이후 분자결합의 영향으로 출력된 신호파형이다.The ionization current measuring device used in the present invention is a commercially available device and measures the ionization waveform in the combustion chamber using the spark plug 1 as a probe. Fig. 2 shows the ionization current waveform obtained by the ionization current measuring device of the present invention. The ignition state shown in the zone ① is a waveform when the strong excitation power is generated in the ignition coil for ignition, and the flame front shown in the zone ② is shown. The state is a waveform in which a lot of ions are generated in the combustion chamber due to the explosion, and the post-flame state indicated in the zone ③ is a signal waveform outputted by the effect of molecular bonding after the explosion.

이온화 전류 측정장치에 의해서 얻어진 파형이 상기 구역 ①②③ 중 어디에 해당하는 가를 구분하여 측정값을 ECU 에 보내면 ECU 는 미리 설정된 맵값에 의해 점화진각을 제어한다.When the waveform obtained by the ionization current measuring device corresponds to the area ①②③ and sends the measured value to the ECU, the ECU controls the ignition advance angle by the preset map value.

본 발명의 이온화 전류에 의한 점화진각 제어방법은 미연소 검출과 노크 센서로서 기존의 스파크 플러그를 사용하여 비용면에서 유리하며 점화시기의 피이드백 제어 뿐만 아니라 공연비 제어와 같은 연소특성의 측정에도 적용이 가능하다.The ignition advance control method by ionization current of the present invention is advantageous in terms of cost by using a conventional spark plug as an unburned detection and knock sensor, and is applicable to measurement of combustion characteristics such as feedback control at ignition timing as well as air-fuel ratio control. It is possible.

Claims (1)

이온화 전류 측정장치를 이용한 엔진의 점화진각 제어방법에 있어서,In the engine ignition control method using an ionization current measuring device, 상기 이온화 전류 측정장치를 스파크 플러그의 2차 점화코일에 연결하고, 상기 2차코일을 통해 검출된 연소실내의 이온화 파형을 측정하여 얻어진 이온화 전류파형을 점화를 위해 점화코일에 강한 여기전력을 발생시켰을 경우의 파형구역, 폭발에 의해 연소실내에 많은 이온이 발생한 파형구역 및 폭발 이후 분자결합의 영향으로 출력된 파형구역으로 구분하여 구역 측정값을 ECU로 전송하고 전송된 이온화 전류 파형을 ECU에서 비교 분석하여 분석된 이온화 전류 파형에 따라 미리 설정된 맵값에 의해 점화진각을 제어하는 이온화 전류에 의한 점화진각 제어방법.The ionization current measurement device was connected to the secondary ignition coil of the spark plug, and the ionization current waveform obtained by measuring the ionization waveform in the combustion chamber detected through the secondary coil generated strong excitation power to the ignition coil for ignition. In this case, it is divided into the waveform area, the waveform area where many ions are generated in the combustion chamber by the explosion, and the waveform area output by the effect of molecular bonding after the explosion. And controlling the ignition progress angle by the preset map value according to the ionization current waveform analyzed by the ionization current control method.
KR1019960064206A 1996-12-11 1996-12-11 Method for controlling ignition advance angle by ionization current KR100372712B1 (en)

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KR100372712B1 true KR100372712B1 (en) 2003-05-12

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