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

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

Cylinder select transistor

Avalanche diodes

PN rectifiers ≥ 1 A, 200-400 V

DC-DC boost low side switch

MOSFET, 100 V, LFPAK

ESD bus protection

CAN / LIN

DC-DC freewheeling diode

Schottky rectifier, 60-100 V

Bipolar transistors

Diodes

ESD protection, TVS, filtering and signal conditioning

MOSFETs

SiC MOSFETs

GaN FETs

IGBTs

Analog & Logic ICs

Automotive qualified products (AEC-Q100/Q101)