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

Highlighted components are Nexperia focus products

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

Driving efficiency takes pole position

Today’s cars are undergoing the greatest transformation the industry has seen. Continued electrification is resulting in significant change from the engine right through to the cloud. Consistently delivering the right functionality, with the right performance, in the right package is how Nexperia is helping ‘driving efficiency’ win.

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Selection Guide 2022

The 2022 edition of the Nexperia Selection Guide presents all our Discrete, Logic and MOSFET devices in one single document to give you a complete overview of our portfolio, making it easier for you to find the right product for your design.

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