汽车电子--点火线圈变压器结构原理

1、product training ignition transformer Oct. 2007 Oct. 2007product training ignition transformerBasic function of gasoline four stroke engine and the function of ignition system.Objective target:To recognize what an modern ignition system do in the engine.Position and function of and engine in a carFi

2、rst of all the engine of acar is responsible toproduce the force and thepower to move the car.They are also responsibleto charge the battery, topower the air conditioner, topower the steering boosterand so on.Oct. 2007cardanshaftenginegearboxaxiselementary function of an 4 stroke gasoline engineInta

3、ke valve opensPistonmovesdownAmixtureofairand gasoline gets into the cylinder because of the low pressureOct. 2007Intake valve closesA high voltage is Piston moves up applied to the spark Themixtureofairplugand gasoline is A sparkoverbetween compressedthe electrodes happens The sparkoveris very hot

4、and ignites the fuel-air mixtureBecause of the explosion the piston moves downThe exhaust valve opensThe piston moves up Because of the rising pressure the exhaust gas is moved out of the cylinderelementary function of an 4 stroke gasoline engineIntake valve opensPiston moves downA mixture of air an

5、d gasoline gets into the cylinder because of the low pressureOct. 2007elementary function of an 4 stroke gasoline engineIntake valve closesPiston moves upThe mixture of airand gasoline is compressedOct. 2007elementary function of an 4 stroke gasoline engineA high voltage is applied to the spark plug

6、A sparkoverbetween the electrodes happensThe sparkoveris very hot and ignites the fuel-air mixtureBecause of the explosion the piston moves downOct. 2007elementary function of an 4 stroke gasoline engineThe exhaust valve opensThe piston moves upBecause of the rising pressure the exhaust gas is moved

7、 out of the cylinderOct. 2007Modern ignition system Newer cars have one ignition transformer on each spark plug. So the high voltage is produced where it is needed and you do not have to transport it. This gives a more reliable system and lower emc interferences. ignition coils (pencil coils) spark

8、plugs Oct. 2007 Oct. 2007product training ignition transformerPrinciple function of an modern ignition coilproduces the Spark respectively the high voltage.Understanding in which way an ignition coilIgnition coil Operating time response: switch on off primary current 8.15A t charge t secondary volta

9、ge discharge 1000V 10.30kV t 100mA t secondary current Oct. 2007 Ignition transformer-functional viewOct. 2007conclusionAll ignition coils made by Pulse are inductive transformers.All ignition coils from Pulse work without a high-voltage distributor. That means every spark plug has its own ignition

10、coil.All ignition coils include two windings, a primary and a secondary.Both windings are always on the same iron core. The iron core isneeded to store the energy.Each coil system has a transistor (mostly an IGBT) which controls the primary winding. Sometimes, the transistor is integrated into the c

11、oil, e.g. VW/AUDI coils, and sometimes the transistor is inthe engine control unit (ECU), e.g. BMW coils.Oct. 2007Oct. 2007product training ignition transformerrequirementsThe attendees know the critical parts and there function in the ignition systemParts of our ignition coils, their function andVW

12、/AUDIOct. 2007parts of a pencil coil, function and specific requirementsmain functionpartprimary coilChange electrical energy into magnetic energyHas to withstand high voltages (electrical field strengths)Needs good adhesion to epoxy resin insidehv-adaptor with emcresistorReduce emc-interferences ca

13、used by the sparksecondary coilTransformmagneticenergy into electrical energyHas to withstand high voltages (electrical field strengths) Needs good adhesion to epoxy resiniron core moduleStore magnetic energyrequirementsFlexible contact to hv-extensionMust have exact size to seal unit during potting

14、 process without cracking the primary bobbinCompensate different thermal coefficients of iron and epoxy resin / secondary bobbinOct. 2007parts of a pencil coil, function and specific requirementsOct. 2007outer metal sheetcontactplastic headstore magnetic energycontact pcblow connect primary conduct

15、magnetic fieldinductive to engine connector, metal shield groundand coil system Hastoberust-freeeven in case of moisture color(red/black) is in spark plug shaftcustomer specificmagneticalparameters Has to withstand up to have to be correct140°Cmain functionpartrequirementsparts of a pencil coil

16、, function and specific requirementsmain functionpartmetal shieldingprotect silicone hoseconnect outer metal shield to spark plugHastoberust-freeeven in case of moisture in spark plug shaftsilicone hoseisolate high voltage to spark plug shaftHigh voltage extensionconnect high voltage to spark plugme

17、chanically fix coil on spark plugrequirementsHas to withstand high voltages (electrical field strengths) Has to withstand temperatures up to220°COct. 2007parts of a pencil coil, function and specific requirementstraElectronic with primary connectorpcontains transistor switch (IGBT) noitstarts a

18、nd stops loading process of the magnetic cnsystemuf nRealizes some additional protective functionsiamContains elements to decrease electromagnetic disturbances caused by the productreduces turn on high voltage pulsestnemHas to be lead freeerHas to have good adhesion to epoxy resiniuqeSoldering have still to be good after hundreds ofrcycles of thermal shockingOct. 2007Oct. 2007product