{"id":9827,"date":"2022-03-10T20:30:50","date_gmt":"2022-03-10T20:30:50","guid":{"rendered":"https:\/\/www.hexorcism.com\/19BP\/sm2565330\/"},"modified":"2022-03-10T20:30:50","modified_gmt":"2022-03-10T20:30:50","slug":"sm2565330","status":"publish","type":"page","link":"https:\/\/www.hexorcism.com\/19BP\/sm2565330\/","title":{"rendered":"FUEL INJECTION CONTROL SYSTEM [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]"},"content":{"rendered":"
\n

FUEL INJECTION CONTROL SYSTEM [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]<\/h3>\n<\/div>\n

SM2565330<\/p>\n

<\/p>\n
\n
\n
\n

id0140u0138600<\/p>\n



\n<\/a><\/p>\n

Outline<\/p>\n

\u2022 Performs optimum fuel injection according to engine operation conditions.<\/div>\n
\u2022 The PCM determines the engine operation conditions based on the signals from each input device and drives the fuel injectors at the optimal fuel injection time (fuel injection amount) and the fuel injection timing to inject fuel.<\/div>\n
\u2022 Optimally controls combustion based on fuel injection amount, fuel injection timing, number of fuel injections, and the fuel pressure to achieve emission performance improvement and higher engine output.<\/div>\n



\n<\/a><\/p>\n

Block Diagram<\/p>\n\n\n\n
\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am3zzn00008273<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n



\n<\/a><\/p>\n

Operation<\/p>\n


<\/p>\n

<\/a><\/p>\n

Injection timing<\/p>\n

\n
\n
\u2022 Fuel injection timing is switched according to the engine operation conditions.<\/div>\n<\/dd>\n<\/dl>\n
\n
\n
\u2022 Fuel injection is performed at the appropriate injection timing and amount based on the following sensor input signals synchronized with the crankshaft rotation during the intake or compression stroke at each cylinder.<\/div>\n
\n
\n
\u2015 MAF sensor<\/div>\n
\u2015 MAP sensor<\/div>\n
\u2015 IAT sensor No.1<\/div>\n
\u2015 IAT sensor No.2<\/div>\n
\u2015 BARO sensor<\/div>\n
\u2015 CKP sensor<\/div>\n
\u2015 ECT sensor No.1, No.2<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n


<\/p>\n

<\/a><\/p>\n

Injection time<\/p>\n

\n
\n
\u2022 The PCM calculates the fuel injection amount according to the engine operation conditions as the fuel injection time and energizes the fuel injectors.<\/div>\n<\/dd>\n<\/dl>\n
\n
\n
Fuel injector energization time and operation conditions<\/div>\n<\/dd>\n<\/dl>\n
\n
\n
\u2022 The fuel injectors cause an operation delay with the start of energization from the PCM. The PCM calculates the fuel injection time by adding the non-injection time (ineffective injection time) due to the operation delay to the actual injection time (effective injection time), and energizes the fuel injectors for this time.<\/p>\n\n\n\n
<\/td>\n\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
ac5uun00001135<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u2022 The fuel injection time is based on the following formula: Fuel injection time = effective injection time + ineffective injection time<\/span><\/div>\n
\n
\n
Ineffective injection time<\/div>\n<\/dd>\n
\n
\u2015 The fuel injectors cause an operation delay with the start of energization due to a delay in the rise of operation current by coil inductance, mass of the needle valve and plunger, and spring resistance. This delay is the ineffective injection time.<\/div>\n
\u2015 The non-injection time is affected by the change in fuel pressure and the battery voltage. Accordingly, the PCM sets the non-injection time according to the fuel pressure and the battery voltage.<\/div>\n<\/dd>\n<\/dl>\n
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\n
Effective injection time<\/div>\n<\/dd>\n
\n
\u2015 The time when the fuel injector valve is open, which is the actual fuel injection time, is called the effective injection time.<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n


<\/p>\n

<\/a><\/p>\n

Determination of effective injection time<\/p>\n

\n
\n
\u2022 The PCM divides the engine operation conditions into control zones according to engine speed and intake air amount, and determines the effective injection time at each control zone to perform optimum air\/fuel ratio control in all engine driving ranges.<\/p>\n\n\n\n
\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am6zzn00002915<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/dd>\n<\/dl>\n

\n

Control zone table<\/p>\n\n\n\n\n\n\n\n\n\n\n
\n

Control name<\/p>\n<\/th>\n

\n

Control outline<\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

\n
Start zone<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 Improved startability<\/div>\n
Control condition<\/div>\n
\u2022 When engine speed is less than 500 rpm<\/div>\n
Determination of fuel injection time<\/div>\n
\u2022 According to engine coolant temperature and engine speed and fuel pressure<\/div>\n<\/td>\n<\/tr>\n
\n
Feedback zone (\u03bb = 1)<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 Improved fuel economy<\/div>\n
\u2022 Improved exhaust gas purification<\/div>\n
Control condition<\/div>\n
\u2022 During engine operation condition except for engine start zone and feedback zone (\u03bb rich) and fuel cut zone<\/div>\n
Determination of fuel injection time<\/div>\n
\u2022 During normal driving, the various correction amounts are added to the basic injection time during normal driving to obtain a ratio that is close to the theoretical air\/fuel ratio.<\/div>\n<\/td>\n<\/tr>\n
\n
Feedback zone (\u03bb rich)<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 Improved driveability<\/div>\n
Control condition<\/div>\n
\u2022 The accelerator pedal opening angle is the specified value or more<\/div>\n
Determination of fuel injection time<\/div>\n
\u2022 Fuel amount increases according to accelerator pedal opening angle<\/div>\n<\/td>\n<\/tr>\n
\n
Purpose<\/div>\n
\u2022 Protection of catalytic converter and exhaust system components (suppression of gas temperature)<\/div>\n
Control condition<\/div>\n
\u2022 The estimated exhaust temperature and estimated catalytic converter temperature are the specified value or more.<\/div>\n
Determination of fuel injection time<\/div>\n
\u2022 Fuel amount increases according to estimated exhaust gas temperature and estimated catalytic converter temperature (promotion of cooling efficiency from vaporization heat)<\/div>\n<\/td>\n<\/tr>\n
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Excessive speed fuel cut zone<\/div>\n<\/td>\n
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Purpose<\/div>\n
\u2022 Engine protection<\/div>\n
Control condition<\/div>\n
\u2022 When engine speed is 6,800 rpm or more (SKYACTIV-G 2.0)<\/div>\n
\u2022 When engine speed is 6,500 rpm or more (SKYACTIV-G 2.5)<\/div>\n
\u2022 When engine speed is 2,500 rpm or more (When DTC P0089:00 is stored)<\/div>\n
Determination of fuel injection time<\/div>\n
\u2022 Fuel injection stopped.<\/div>\n<\/td>\n<\/tr>\n
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Deceleration fuel cut zone<\/div>\n<\/td>\n
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Purpose<\/div>\n
\u2022 Improved fuel economy<\/div>\n
Control condition<\/div>\n
\u2022 If all of the following conditions are met while the vehicle is decelerating<\/div>\n
\n
\n
\u2015 Accelerator pedal is fully closed<\/div>\n
\u2015 Engine speed is specified value or more<\/div>\n
\u2015 Vehicle speed is specified value or more<\/div>\n<\/dd>\n<\/dl>\n
Determination of fuel injection time<\/div>\n
\u2022 Fuel injection is stopped.<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


<\/p>\n

<\/a><\/p>\n

Fuel injection time calculation method table<\/p>\n

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(A: Fuel injection time base, B: Correction for fuel injection time)<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n
Contents<\/span><\/div>\n
(Calculation or determination method for fuel injection time and correction)<\/span><\/div>\n<\/td>\n
\n
Control zone<\/span><\/div>\n<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
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Injection time at engine start<\/div>\n<\/td>\n
\n
Set value according to engine coolant temperature (low engine coolant temperature\u2192long injection time)<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Basic injection time<\/div>\n<\/td>\n
\n
Basic injection time = Charging efficiency *1<\/sup> \u00d7 fuel flow coefficient*2<\/sup><\/span><\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Fuel cut<\/div>\n<\/td>\n
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Fuel injection time = 0<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n<\/tr>\n
\n
Ineffective injection time<\/div>\n<\/td>\n
\n
Set time according to fuel injector performance<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n
\n
A<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Volume increase correction at engine start<\/div>\n<\/td>\n
\n
Purpose: Ensures engine speed stability just after engine start<\/div>\n
Correction condition<\/div>\n
\u2022 Specified time according to engine coolant temperature directly after engine start<\/div>\n
Correction amount<\/div>\n
\u2022 Low engine coolant temperature\u2192large correction<\/div>\n
\u2022 Low intake air temperature\u2192large correction<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
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B<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Feedback correction (A\/F sensor)<\/div>\n<\/td>\n
\n
Purpose: Controls air\/fuel ratio to theoretical air\/fuel ratio<\/div>\n
Correction amount<\/div>\n
\u2022 A\/F sensor output current is 0 mA or less\u2192volume decrease correction<\/div>\n
\u2022 A\/F sensor output current is 0 mA or more\u2192volume increase correction<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Feedback correction (HO2S)<\/div>\n<\/td>\n
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Purpose: Controls air\/fuel ratio to theoretical air\/fuel ratio<\/div>\n
Correction amount<\/div>\n
\u2022 HO2S output voltage is approx. 0.7 V or more\u2192volume decrease correction<\/div>\n
\u2022 HO2S output voltage is approx. 0.7 V or less\u2192volume increase correction<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Warm-up volume increase correction<\/div>\n<\/td>\n
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Purpose: Ensures combustion stability when engine coolant temperature is low<\/div>\n
Correction condition<\/div>\n
\u2022 When engine coolant temperature is at set value<\/div>\n
Correction amount<\/div>\n
\u2022 High charging efficiency, low engine coolant temperature\u2192large correction<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Learning correction<\/div>\n<\/td>\n
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Purpose: Corrects deviation in air\/fuel ratio from deterioration over time of mechanical devices<\/div>\n
Correction amount<\/div>\n
\u2022 Learned value based on average value of A\/F deviation amount (feedback amount)<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n
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Heavy load volume increase correction<\/div>\n<\/td>\n
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Purpose: Improved engine output, decrease of exhaust gas temperature<\/div>\n
Correction condition<\/div>\n
\u2022 Based on the fixed value when the accelerator pedal opening angle is a certain value or more, otherwise, based on engine speed and charging efficiency.<\/div>\n
Correction amount<\/div>\n
\u2022 High engine speed, high charging efficiency\u2192large correction<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
B<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n
\n
<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
*1:Charging efficiency is the ratio of the actual amount of intake air to the maximum air charging amount (mass volume) of the cylinder. The value increases as the engine load increases.<\/div>\n
*2:Fuel flow coefficient is a coefficient to calculate a fuel injection time from a fuel injection amount required for an intake air amount.<\/div>\n


<\/p>\n

<\/a><\/p>\n

Fuel cut<\/p>\n

\n
\n
\u2022 Includes fuel cut under the following conditions, except fuel cut at excessive engine speed and deceleration fuel cut according to engine operation.<\/div>\n<\/dd>\n<\/dl>\n

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Fuel cut table<\/p>\n\n\n\n\n\n\n\n\n\n\n
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Control name<\/p>\n<\/th>\n

\n

Control outline<\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

\n
Fuel cut during selector lever shifting in D range<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 ATX protection<\/div>\n
Control conditions<\/div>\n
\u2022 When shifting while vehicle is stopped and engine raced<\/div>\n<\/td>\n<\/tr>\n
\n
Sensor malfunction fuel cut<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 To prevent engine damage from abnormal ignition due to a malfunction input of a cylinder identification or the engine speed signal.<\/div>\n
Control conditions<\/div>\n
\u2022 When a malfunction in the crankshaft position sensor or exhaust camshaft position sensor is detected<\/div>\n<\/td>\n<\/tr>\n
\n
Dechoke control<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 To improve engine startability when spark plugs are flooded (scavenging)<\/div>\n
Control conditions<\/div>\n
\u2022 When cranking close to fully-open throttle valve<\/div>\n<\/td>\n<\/tr>\n
\n
Theft prevention<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 To prevent theft<\/div>\n
Control conditions<\/div>\n
\u2022 Immobilizer system related information (engine start prohibited) received from BCM<\/div>\n<\/td>\n<\/tr>\n
\n
Fuel-cut at time of collision<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 For safety assurance<\/div>\n
Control conditions<\/div>\n
\u2022 Collision signal from SAS control module is received<\/div>\n<\/td>\n<\/tr>\n
\n
Fuel cut during engine rotation resonance caused by dual-mass flywheel<\/div>\n
(SKYACTIV-G 2.0 (MTX))<\/div>\n<\/td>\n
\n
Purpose<\/div>\n
\u2022 To prevent engine damage due to engine rotation resonance caused by dual-mass flywheel<\/div>\n
Control conditions<\/div>\n
\u2022 Engine rotation resonance caused by dual-mass flywheel is detected (extremely low engine speed range lowering idle speed)<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


<\/p>\n

<\/a><\/p>\n

Boost Circuit<\/p>\n

\n
\n
\u2022 The battery positive voltage input via the sub relay is boosted up to 60 V.<\/div>\n<\/dd>\n<\/dl>\n


<\/p>\n

<\/a><\/p>\n

Output Circuit<\/p>\n

\n
\n
\u2022 To improve fuel injection response, the plunger pulling force is strengthened by providing high current (over excitation current) when the fuel injector is open.<\/div>\n
\u2022 To reduce fuel injector heat generation, the opening of the fuel injector is kept open using low current after it opens.<\/div>\n<\/dd>\n<\/dl>\n

\n\n\n\n\n\n\n\n
\n

Fuel injector status<\/p>\n<\/th>\n

\n

PCM operation<\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

\n
Opening starts<\/div>\n<\/td>\n
\n
1. Provides specified value, boosted by the boost circuit, to the opening transistor.<\/div>\n
2. Voltage is provided to the fuel injector, the ground transistor is turned on and grounded, and the fuel injector opens.<\/div>\n
3. After the fuel injector is opened, the opening transistor is turned off.<\/div>\n<\/td>\n<\/tr>\n
\n
Opening held<\/div>\n<\/td>\n
\n
\u2022 Controls the on\/off of the holding transistor (12 V output) so that the hold current of the fuel injector is constant.<\/div>\n<\/td>\n<\/tr>\n
\n
Closing<\/div>\n<\/td>\n
\n
\u2022 Turns off the holding and ground transistors at the same time the fuel injection signal from the PCM is stopped, and cuts the current.<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n

<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

FUEL INJECTION CONTROL SYSTEM [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))] SM2565330 id0140u0138600 Outline \u2022 Performs optimum fuel injection according to engine operation conditions. \u2022 The PCM determines the engine operation conditions based on the signals from each input device and drives the fuel injectors at the optimal fuel injection time (fuel injection amount) and the fuel injection timing to inject fuel. \u2022 Optimally controls combustion based on fuel injection amount, fuel injection timing, number of fuel […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-9827","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages\/9827","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/comments?post=9827"}],"version-history":[{"count":0,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages\/9827\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/media?parent=9827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}