{"id":1479,"date":"2023-01-19T17:56:27","date_gmt":"2023-01-19T08:56:27","guid":{"rendered":"https:\/\/am.denso.com\/plug-global\/?page_id=1479"},"modified":"2023-03-02T20:28:01","modified_gmt":"2023-03-02T11:28:01","slug":"spark","status":"publish","type":"page","link":"https:\/\/am.denso.com\/plug-global\/basic\/spark\/","title":{"rendered":"Spark and Ignition"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Spark<\/h3>\n\n\n\n<div class=\"wp-block-columns editorskit-no-tablet is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>When the high voltage produced by the ignition system is applied between the center electrode and ground electrode of the spark plug, the insulation between the electrodes breaks down, current flows in the discharge phenomenon, and an electrical spark is generated.<\/p>\n\n\n\n<p>This spark energy trigger ignition and combustion in the compressed air-fuel mixture.<br>This discharge is of extremely brief duration (about 1\/1000 of a second) and is extraordinarily complex.<\/p>\n\n\n\n<p>The role of the spark plug is to reliably generate a strong spark between the electrodes accurately at the specified time to create the trigger for combustion of the gas mixture.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-video\"><video controls poster=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spart_pre.png\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark.mp4\"><\/video><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile editorskit-no-desktop editorskit-no-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>When the high voltage produced by the ignition system is applied between the center electrode and ground electrode of the spark plug, the insulation between the electrodes breaks down, current flows in the discharge phenomenon, and an electrical spark is generated.<\/p>\n\n\n\n<p>This spark energy trigger ignition and combustion in the compressed air-fuel mixture.<br>This discharge is of extremely brief duration (about 1\/1000 of a second) and is extraordinarily complex.<\/p>\n\n\n\n<p>The role of the spark plug is to reliably generate a strong spark between the electrodes accurately at the specified time to create the trigger for combustion of the gas mixture.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-video\"><video controls poster=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spart_pre.png\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark.mp4\"><\/video><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Ignition<\/h3>\n\n\n\n<p>Ignition by electrical spark occurs because the fuel particles between the electrodes are activated by the spark to discharge, a chemical reaction (oxidation) is triggered, the heat of reaction is generated, and the flame core is formed. This heat activates the surrounding air-fuel mixture, eventually a flame core is formed that spreads the combustion to the surroundings itself.<br>However, if the quenching effect between the electrodes (the work of the electrodes absorbing the heat and extinguishing the flame) is greater than the flame core heat generation action, the flame core is extinguished and the combustion stops.<br>If the plug gap is wide, the flame core is larger and the quenching effect is smaller, so reliable ignition can be expected, but if the gap is too wide, a large discharge voltage becomes necessary, the limits of the coil performance are exceeded, and discharge becomes impossible.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark_img_02.png\" alt=\"\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">Change in the discharge voltage<\/h3>\n\n\n\n<p>The ignition system normally generates 10-30 kV secondary voltage.<\/p>\n\n\n\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile is-vertically-aligned-top\">\n  <figure class=\"wp-block-media-text__media menuBlock01__heading\">\n    <img decoding=\"async\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark_img_03_00.png\" alt=\"\" class=\"wp-image-4337 size-full\" \/>\n    <img decoding=\"async\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark_img_03_01.png\" alt=\"\" class=\"wp-image-4337 size-full\" \/>\n    <img decoding=\"async\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark_img_03_02.png\" alt=\"\" class=\"wp-image-4337 size-full\" \/>\n    <img decoding=\"async\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark_img_03_03.png\" alt=\"\" class=\"wp-image-4337 size-full\" \/>\n    <img decoding=\"async\" src=\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/spark_img_03_04.png\" alt=\"\" class=\"wp-image-4337 size-full\" \/>\n  <\/figure>\n  <div class=\"wp-block-media-text__content\">\n\n<script>\njQuery(function ($) {\n\t$('.menuBlock01__heading img:not(:first)').hide();\n\t$('.sparkGraphBtn li').hover(\n\t\tfunction(){\n\t\t\tvar n = $('.sparkGraphBtn li').index(this) + 1;\n\t\t\t$('.menuBlock01__heading img').hide();\n\t\t\t$('.menuBlock01__heading img').eq(n).show();\n\t\t} ,\n\t\tfunction(){\n\t\t\t$('.menuBlock01__heading img').hide();\n\t\t\t$('.menuBlock01__heading img').eq(0).show();\n\t})\n});\t\n<\/script>\n  <style>\n\/*===========================\n.sparkGraphBtn\n=============================*\/\n.sparkGraphBtn {\n\ttext-align: left;\n\tpadding-left: 0;\n}\n.sparkGraphBtn li {\n\tposition: relative;\n\tpadding: 0 5px;\n\tmargin: 5px 20px 0 0;\n\tdisplay: inline-block;\n\tcolor: #FFF;\n\tcursor: pointer;\n\tborder-bottom-width: 3px;\n\tborder-bottom-style: solid;\n}\n.sparkGraphBtn li:nth-child(1){ background: #FF6507; border-bottom-color: #b74c0b; }\n.sparkGraphBtn li:nth-child(2){ background: #C3041B; border-bottom-color: #920617; }\n.sparkGraphBtn li:nth-child(3){ background: #009900; border-bottom-color: #037203; }\n.sparkGraphBtn li:nth-child(4){ background: #008CFF; border-bottom-color: #045495; }\n.sparkGraphBtn li:hover {\n\tborder-bottom: 0;\n\tborder-bottom-width: 1px;\n\ttop: 2px;\n}\n    \n    <\/style>\n  <ul class=\"sparkGraphBtn\">\n<li>Voltage rise<\/li>\n<li>Spark generation<\/li>\n<li>Capacitance spark<\/li>\n<li>Inductance spark<\/li>\n<\/ul>\n<p>Click the number of the text.<\/p>\n\n\n<ol class=\"wp-block-list\">\n\n<li>When the primary current is cut off at the &#8216;a&#8217; point, the secondary&nbsp;<strong><font color=\"ff6507\">voltage rises<\/font><\/strong>.<\/li>\n\n\n<li>At the &#8216;b&#8217; point, partway through the rise in voltage, the spark plug reaches the discharge voltage and a&nbsp;<strong><font color=\"#C3041B\">spark is generated<\/font><\/strong>&nbsp;between the electrodes.<\/li>\n\n\n<li>Between &#8216;b&#8217; and &#8216;c&#8217; is called the&nbsp;<strong><font color=\"#009900\">capacitance spark<\/font><\/strong>. At the start of the discharge, the spark is generated by the electrical energy stored in the secondary circuit. The current is large but the duration is short.<\/li>\n\n\n<li>Between &#8216;c&#8217; and &#8216;d&#8217; is called the&nbsp;<strong><font color=\"#008CFF\">inductance spark<\/font><\/strong>. The spark is generated by the electromagnetic energy of the coil. The current is small but the duration is long. From the &#8216;c&#8217; point, the discharge is continued for about 1 millisecond and at the &#8216;d&#8217; point, the discharge ends.<\/li>\n\n<\/ol>\n\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">More Information<\/h3>\n\n\n\n<p>You can read more detailed explanations about sparking and ignition.<\/p>\n\n\n\n<ul class=\"is-style-default wp-block-list\">\n<li><a href=\"https:\/\/am.denso.com\/plug-global\/basic\/spark-condition\/\" class=\"ek-link\">Conditions that affect the discharge voltage<\/a><br><a href=\"https:\/\/am.denso.com\/plug-global\/basic\/spark-performance\/\" class=\"ek-link\">Performance required of spark plugs<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Spark When the high voltage produced by the ignition system is applied between the center electrode and ground [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"parent":464,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":2,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","footnotes":""},"class_list":["post-1479","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/pages\/1479","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/comments?post=1479"}],"version-history":[{"count":35,"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/pages\/1479\/revisions"}],"predecessor-version":[{"id":5363,"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/pages\/1479\/revisions\/5363"}],"up":[{"embeddable":true,"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/pages\/464"}],"wp:attachment":[{"href":"https:\/\/am.denso.com\/plug-global\/wp-json\/wp\/v2\/media?parent=1479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}