50 %
50 %
Information about MPFI

Published on February 11, 2011

Author: ikram0175


MPFI: MPFI IKRAM SINGH HARIKA B TECH 6 MAE 1Y A2305408048 INTRODUCTION: INTRODUCTION MPFI stands for MULTI POINT FUEL INJECTION. It is an improvement over carburetors. It allows more efficient combustion of fuel, thereby producing more power with lesser emissions. It is a technology similar to what CRDI is in diesel engines. NEED FOR MPFI: NEED FOR MPFI In carburetor, air and fuel are mixed in a fixed ratio and sent to the cylinders for combustion. This is a purely mechanical system with negligible flexibility. It often sends more fuel into the cylinder than the available air, thereby leading to incomplete combustion, high fuel consumption and excess emissions. This also leads to carbon deposits inside the combustion chamber and reduces engine life. BASIC CONCEPT: BASIC CONCEPT MPFI is an intelligent way of doing what a carburetor does. In this system each cylinder has injectors to spray the fuel/air charge into the cylinders. The fuel and air are mixed in what is called the intake manifold. BASIC CONCEPT: BASIC CONCEPT In MPFI, each injector in controlled by the ECU. The ECU monitors various engine parameters and accordingly decides just how much fuel is to be injected into the cylinder and at precisely what time . This system also allows each cylinder to be controlled independently TYPES OF MPFI SYSTEMS: TYPES OF MPFI SYSTEMS The various types of MPFI systems are: 1. Simuntaneous : Together in all the cylinders. 2. Sequential : Direct injection into the individual cylinders against their power strokes. 3. Group : In cylinder pairs [in V engines] TYPES OF MPFI SYSTEMS: TYPES OF MPFI SYSTEMS Choosing the correct technique according to the engine configuration results in: - better power balance between cylinders - higher output from each cylinder - faster throttle response Of these technologies, sequential gives the best combination of power balance and output in inline 4 cylinder engines. ADVANTAGES OF MPFI: ADVANTAGES OF MPFI (1) More uniform A/F mixture will be supplied to each cylinder, hence the difference in power developed in each cylinder is minimum. (2)Vibration from the engine equipped with this system is less, due to this the life of engine components is improved. (2) No need to crank the engine twice or thrice in case of cold starting as happens in the carburettor system. (3) Immediate response, in case of sudden acceleration / deceleration. (4) Since the engine is controlled by ECU, more accurate amount of A/F mixture will be supplied and as a result complete combustion will take place. This leads to effective utilization of fuel supplied and hence low emission level. (5) The mileage of the vehicle will be improved. INJECTORS: INJECTORS These are precision built solenoid valves. They have single or multiple orifices which spray fuel into the intake manifold. The fuel is taken from a common rail/header, pressurized to around 3 bar, fed by a high pressure fuel pump. INJECTORS: INJECTORS INJECTORS: INJECTORS INJECTOR CARE: INJECTOR CARE Fuel injectors can get clogged by olefin wax, water, dirt and other debris material present in the fuel or in the intake manifold. As such they require some basic maintenance and periodic cleaning. - Regular service of vehicle at specified intervals - Use of unadulterated and recommended grade fuel - Use of specialized injector cleaner additives - Periodic cleaning of injectors on injector cleaning machine. ECU: ECU ECU or the Electronic Control Unit is the brain behind the MPFI system. It is a computer chip which receives input on various engine parameters, compares them against preloaded engine and throttle maps and accordingly decides exactly how much fuel is to be injected into which cylinder and at what time ECU: ECU Because of this, the engine becomes more cleaner, more responsive and uses lesser fuel. Modern ECUs have memory by which they can learn the user’s driving style. For e.g., if someone has a habit of speedy pick up, the ECU will remember that and give more power at lower rpm by injecting in more fuel. It will judge by the amount of pressure being put of the throttle. ECU: ECU ECU: ECU The various parameters monitored by the ECU are: Ambient temperature Coolant temperature Exhaust temperature Exhaust O 2 content Inlet manifold vacuum Throttle position Engine rpm Vehicle road speed Crankshaft position Camshaft position Outside air pressure Pressure on throttle ECU CHIPPING: ECU CHIPPING Manufactures program the ECU for general use keeping in mind fuel efficiency, engine life, service intervals fuel quality and diverse usage conditions. The engines are made to develop only a fraction of the output which they actually can produce. ECU Chipping refers to modifying the original ECU programming to alter the way it reacts to certain inputs, in order to maximize engine performance ECU CHIPPING: ECU CHIPPING This is done to change engine power and torque, performance characteristics at a particular rpm, engine rpm limit, road speed limit, engine timing etc. Chipping can be done either by overriding the original ECU with a specially designed one or by simply remapping the original ECU as per requirement. ECU Chipping: ECU Chipping By chipping the ECU, we can significantly increase the engine’s power and torque and rpm limit for drag races etc. We can change the mapping to improve pick up in a particular rpm range, like for reducing turbo lag. We can get custom maps developed for our own driving style. Commercial vehicles can be fitted with speed limiters and be mapped for torque and reduced rpm in interest of safety and to boost engine life and economy. THE END: THE END

Add a comment

Related presentations

Related pages

Umpfi´s Slotbox (Axel Umpfenbach)

Umpfi's Slotbox Axel Umpfenbach Das Rennbahngeschäft für Kinder ab 30. Schulstr. 23a, 51491 Overath Tel.: 02204/768639 Fax: 02204/768714 gut ...
Read more

Fuel injection - Wikipedia, the free encyclopedia

Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector.
Read more

Audi, Motorsteuergerät, MPFI -

Audi - Motorsteuergerät - MPFI, MPFI: günstige Reparatur von Steuergeräten und KFZ-Elektronik
Read more

MPI – Wikipedia

Die Abkürzung MPI steht für: Magnetic Particle Imaging; Mannheimer Peritonitis-Index, Index zur Beurteilung der Peritonitis; Master Patient Index, ein ...
Read more

MPFI - Forum: Lexikon -

Mach mit! Wenn Dir die Beiträge zum Thread "MPFI" gefallen haben oder Du noch Fragen hast oder Ergänzungen machen möchtest, solltest Du Dich gleich bei ...
Read more

MPFI - Forum: Civic 92-95 -

Hallo Gemeinde! Ist das hier komplett alles was ich für den MPFI Umbau brauche? - Zündverteiler komplett - Lambdasonde - Verbindungsrohr Wasserpumpe ...
Read more

MPFI - What does MPFI stand for? The Free Dictionary

Acronym Definition; MPFI: Multi-Point Fuel Injection: MPFI: Multiport Fuel Injection: MPFI: Mobile Payment Forum of India: MPFI: Media Professionals of ...
Read more


MPFI - Download as PDF File (.pdf), Text File (.txt) or read online. Scribd is the world's largest social reading and publishing site. Browse Browse ...
Read more

The GNU MPFR Library

The GNU MPFR Library [MPFR links] [introduction] ... Get a multiple-precision interval arithmetic library MPFI, based on MPFR.
Read more

Max Planck Florida Institute for Neuroscience

The Max Planck Florida Institute for Neuroscience, part of Germany’s Max Planck Society for the Advancement of Science, conducts research focused on neural
Read more