{"id":1429,"date":"2012-07-22T12:45:07","date_gmt":"2012-07-22T11:45:07","guid":{"rendered":"http:\/\/www.atttraining.com\/auto\/?p=1429"},"modified":"2014-03-28T14:13:33","modified_gmt":"2014-03-28T14:13:33","slug":"engine-mapping-quick-overview-re-red-bull-f1","status":"publish","type":"post","link":"http:\/\/tomdenton.org\/blog\/?p=1429","title":{"rendered":"Engine mapping \u2013 quick overview re Red Bull F1"},"content":{"rendered":"<p>The following is from one of my textbooks and refers to ignition timing \u2013 fig 10-17 shows a timing and dwell map (a similar method is used to determine engine fuelling.<\/p>\n<p>The F1 issue seems to be that the FIA regulations say that the &#8216;looked up&#8217; (vertical axis) should be set so as to produce maximum torque at all times when the driver requests it from the throttle pedal.<\/p>\n<p>F1 systems are complex but this should help:<\/p>\n<p>==========<\/p>\n<p>The basic ignition advance angle is obtained from a memorized cartographic map. This is held in a ROM chip within the ECU. The parameters for this are:<\/p>\n<ul>\n<li>Engine rpm \u2013 given by the flywheel sensor.<\/li>\n<li>Engine load \/Inlet air pressure \u2013 given by the manifold absolute pressure sensor.<\/li>\n<\/ul>\n<p>The above two parameters (speed and load) give the basic setting but to ensure optimum advance angle the timing is corrected by:<\/p>\n<ul>\n<li>Coolant temperature.<\/li>\n<li>Air temperature.<\/li>\n<li>Throttle position.<\/li>\n<\/ul>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" alt=\"\" src=\"https:\/\/i0.wp.com\/tomdenton.org\/blog\/wp-content\/uploads\/2012\/07\/072212_1145_Enginemappi111.png?w=980\" \/><\/p>\n<p><span style=\"color: #4f81bd; font-size: 9pt;\"><strong>Figure 1017 Engine timing and dwell maps<br \/>\n<\/strong><\/span><\/p>\n<p>The ignition is set to a predetermined advance during the starting phase. Figure 10.17 shows a typical advance map and a dwell map used by the Motronic system. These data are held in ROM. For full ignition control, the electronic control unit has first to determine the basic timing for three different conditions:<\/p>\n<ul>\n<li>Under idling conditions, ignition timing is often moved very quickly by the ECU in order to control idle speed. When timing is advanced, engine speed will increase within certain limits.<\/li>\n<li>Full load conditions require careful control of ignition timing to prevent combustion knock. When a full load signal is sensed by the ECU (high manifold pressure) the ignition advance angle is reduced.<\/li>\n<li>Partial throttle is the main area of control and, as already stated, the basic timing is set initially by a programme as a function of engine speed and manifold pressure.<\/li>\n<\/ul>\n<p>Corrections are added according to:<\/p>\n<ul>\n<li>Operational strategy.<\/li>\n<li>Knock protection.<\/li>\n<li>Phase correction.<\/li>\n<\/ul>\n<p>The ECU will also control ignition timing variation during overrun fuel cut-off and reinstatement and also ensure anti-jerk control. When starting, the ignition timing plan is replaced by a specific starting strategy. Phase correction is when the ECU adjusts the timing to take into account the time taken for the HT pulse to reach the spark plugs. To ensure good drivability the ECU can limit the variations between the two ignition systems to a maximum value, which varies according to engine speed and the basic injection period.<\/p>\n<p>A three-dimensional cartographic map, shown in Figure 9.25, is used to represent how the information on an engine&#8217;s fuelling requirements is stored. This information forms part of a read only memory (ROM) chip in the ECU. When the ECU has determined the look-up value of the fuel required (injector open time), corrections to this figure can be added for battery voltage, temperature, throttle change or position and fuel cut off.<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" alt=\"\" src=\"https:\/\/i0.wp.com\/tomdenton.org\/blog\/wp-content\/uploads\/2012\/07\/072212_1145_Enginemappi21.png?w=980\" \/><\/p>\n<p><span style=\"color: #4f81bd; font-size: 9pt;\"><strong>Figure 925 Cartographic map used to represent how the information on an engine&#8217;s fuelling requirements are stored<br \/>\n<\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The following is from one of my textbooks and refers to ignition timing \u2013 fig 10-17 shows a timing and dwell map (a similar method is used to determine engine fuelling. The F1 issue seems to be that the FIA regulations say that the &#8216;looked up&#8217; (vertical axis) should be set so as to produce [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[23],"tags":[],"class_list":["post-1429","post","type-post","status-publish","format-standard","hentry","category-motorsport"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p79TdE-n3","jetpack-related-posts":[{"id":901,"url":"http:\/\/tomdenton.org\/blog\/?p=901","url_meta":{"origin":1429,"position":0},"title":"F1 Telemetry","author":"Tom Denton","date":"January 27, 2011","format":false,"excerpt":"First let\u2019s define what this means: Telemetry is a technology that allows remote measurement and transmission of information. The Greek root of the word is that tele means remote, and metron means measure. Telecommand is, in a way, a response to telemetry, as it means sending a command or instruction.\u2026","rel":"","context":"In &quot;Automotive&quot;","block_context":{"text":"Automotive","link":"http:\/\/tomdenton.org\/blog\/?cat=15"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":239,"url":"http:\/\/tomdenton.org\/blog\/?p=239","url_meta":{"origin":1429,"position":1},"title":"Electronic throttle","author":"Tom Denton","date":"April 30, 2010","format":false,"excerpt":"In April 2010, Bosch produced its 50 millionth DV-E electric throttle device at its Nuremberg plant. The unit regulates the air supply in the gasoline engine\u2019s intake tract. It consists of a throttle device with an electric drive and an angle sensor. On the basis of the accelerator position, the\u2026","rel":"","context":"In &quot;Automotive&quot;","block_context":{"text":"Automotive","link":"http:\/\/tomdenton.org\/blog\/?cat=15"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1344,"url":"http:\/\/tomdenton.org\/blog\/?p=1344","url_meta":{"origin":1429,"position":2},"title":"Advanced Corona Ignition System (ACIS)","author":"Tom Denton","date":"March 15, 2012","format":false,"excerpt":"TECHNOLOGY ENABLES SIGNIFICANTLY IMPROVED FUEL ECONOMY, REDUCED EMISSIONS, EXTENDED SERVICE LIFE System technology enables up to 10-percent reduced fuel consumption and is designed for volume manufacturing in current and future engine architectures FRANKFURT, September 13, 2011 \u2026 Federal-Mogul Corporation (NASDAQ: FDML) will introduce at this year's IAA (Frankfurt Auto Show,\u2026","rel":"","context":"In &quot;Automotive&quot;","block_context":{"text":"Automotive","link":"http:\/\/tomdenton.org\/blog\/?cat=15"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1267,"url":"http:\/\/tomdenton.org\/blog\/?p=1267","url_meta":{"origin":1429,"position":3},"title":"Engine management barometric pressure sensors","author":"Tom Denton","date":"December 1, 2011","format":false,"excerpt":"Figure 1 Bosch SMP480 barometric pressure sensor (Source: Bosch Media) The new Bosch SMP480 barometric pressure sensor is extraordinarily small. It takes up just one-quarter of the space of its predecessor. This makes it easier than ever to include it in the electronic control units used in automotive technology. This\u2026","rel":"","context":"In &quot;Automotive&quot;","block_context":{"text":"Automotive","link":"http:\/\/tomdenton.org\/blog\/?cat=15"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1051,"url":"http:\/\/tomdenton.org\/blog\/?p=1051","url_meta":{"origin":1429,"position":4},"title":"McLaren MP4-26","author":"Tom Denton","date":"May 27, 2011","format":false,"excerpt":"A few interesting facts and figures: Specifications Monocoque: McLaren-moulded carbonfibre composite incorporating front and side impact structures Front suspension: Inboard torsion bar\/damper system operated by pushrod and bell crank with a double wishbone arrangement Rear suspension: Inboard torsion bar\/damper system operated by pullrod and bell crank with a double wishbone\u2026","rel":"","context":"In &quot;Automotive&quot;","block_context":{"text":"Automotive","link":"http:\/\/tomdenton.org\/blog\/?cat=15"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":290,"url":"http:\/\/tomdenton.org\/blog\/?p=290","url_meta":{"origin":1429,"position":5},"title":"An F1 Engine &#8211; Just how far will it go at Spa?","author":"Tom Denton","date":"August 5, 2010","format":false,"excerpt":"Ok, I was just thinking\u2026 last year I was at the Grand Prix at Spa Francorchamps and I remember it being 7,003m and 95cm (call it 7004m) round the track, and I remember it being a 44 lap race. Doing the sums means that the cars travel 308176m or 308.2km\u2026","rel":"","context":"In &quot;Automotive&quot;","block_context":{"text":"Automotive","link":"http:\/\/tomdenton.org\/blog\/?cat=15"},"img":{"alt_text":"plan_details_sm","src":"https:\/\/i0.wp.com\/tomdenton.org\/blog\/wp-content\/uploads\/2010\/08\/plan_details_sm_thumb1.jpg?resize=350%2C200","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1429","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1429"}],"version-history":[{"count":3,"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1429\/revisions"}],"predecessor-version":[{"id":2112,"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1429\/revisions\/2112"}],"wp:attachment":[{"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1429"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/tomdenton.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}