双极性晶体管

二极管

ESD保护、TVS、滤波和信号调节ESD保护

MOSFET

氮化镓场效应晶体管(GaN FET)

绝缘栅双极晶体管(IGBTs)

模拟和逻辑IC

汽车应用认证产品(AEC-Q100/Q101)

Electronic Fuel Injection

One result of the continuing pressure for ever more fuel-efficient vehicles is a greater use of direct electronic fuel injection (EFI) systems. These injector/valve controller systems help ensure the most efficient air-fuel mix within both diesel and gasoline engines regardless of the running conditions of the vehicle. By connecting the fuel injectors to the engine control unit and various sensors, including exhaust gas temperature (EGT), ensure the appropriate and precise spraying of the atomized fuel.

  • Block diagram
  • Design considerations
  • Product listing
  • Support

Block diagram

TVSdiode D1 D2 ESDdiode Signalconditioning BATTERY Sensors incl.EGT, O2,etc. Hold - Vbat Vbat Vboost DC-DC boost (50-70 V) aaa-028523 Engine management sensors Pull-in - Vboost A2 A2 A4 drive 1 injector 1 driverecirc drive 2 current monitoring LS1 LS2 shunt LS3 LS4 injector 2 drive 3 injector 3 drive 4 injector 4 CAN/FlexRay Reverse batteryprotection 12 V ECU Highlighted components are Nexperia focus products.

Transient Voltage Suppressors (TVS)

Reverse battery protection

Pull-in transistor

Hold current transistor

Freewheeling diode

Cylinder select transistor

Avalanche diodes

DC-DC boost low side switch

ESD bus protection

DC-DC freewheeling diode

Select a component

To view more information about the Nexperia components used in this application, please select a component above or click on a component (highlighted in blue) in the block diagram.

Design considerations

  • Controlling coil current is the key to injector fuel accuracy, with ‘pull-in’ requiring large currents while less current is needed to ‘hold’
  • N-channel MOSFETs for switch pull-in, hold current and cylinder select need high current transient robustness
  • Schottky rectifier or PN rectifier for freewheeling and protection of inductive load
  • Ensure adequate suppression and filtering of EMI noise
  • Using 100 V, ultra-low-leakage Schottky technology helps prevent thermal runaway

Product listing

Transient Voltage Suppressors (TVS)

Reverse battery protection

Hold current transistor

DC-DC boost low side switch

ESD bus protection

DC-DC freewheeling diode