Gasoline engine control block diagram

Modern engine management systems process numerous input parameters delivered by accurate and reliable sensors and control a variety of different actuators by power devices as air intake and fuel injection for every combustion stroke to meet efficiency requirements and stringent emission regulations. NXPs technology and product advances are driving up overall vehicle efficiency and helping reduce fuel consumption, CO2 emissions and costs.

Driving diverse loads
The required load currents in an engine control system goes from several mA for driving LEDs to displays the status and operating mode in the instrument cluster up to more than 20 A for driving injectors for direct injection systems. NXP offers discrete solutions such as small-signal MOSFETs or low VCEsat (BISS) transistors, constant current sources (PSSI), high-side loadswitches (PBLS family) and logic devices for small and medium loads as indicator lamps and relays for fuel pump, valves and further auxiliary sub-systems.

Power MOSFET devices in advanced TrenchMOS technology will drive injectors for manifold and direct injection systems, heater elements for O2 sensors or work as key components for boost converter in direct injection systems. Especially the highly innovative LFPAK devices with a footprint 46% smaller than that of DPAK whilst offering similar thermal performance is a perfect choice for gasoline direct injection systems with small form factor and allows extremely fast atomization of fuel under high pressure in order to achieve the best possible mixture formation. TrenchPLUS is a range of standard MOSFETs with added protection features, including current and temperature sensing components, overvoltage clamps and gate protection (ESD) diodes.

All of these products have some characteristics in common, with low conduction losses and innovative packages to save board space and provide cost-effective solutions.

In-vehicle communication
Besides offering standalone transceivers for all networking protocols for engine management systems as CAN and FlexRay with advanced functionality such as failure management and power saving, NXP offers highly integrated in-vehicle-networking products such as our system basis chip (SBC) families. The SBCs combine one or several bus transceivers, voltage regulators, I/O pins and the option of a watchdog in a single IC. The combination of these integrated functions offers advanced low-power mode control and smart fail-safe behavior. Pin compatible family devices with different transceiver options support scalable platforms by simply changing the population of the printed circuit board. LIN can operate as costs optimized and robust solution for actuators and sensors in an engine control system.

Magnetoresistive and Temperature Sensors
NXP’s magnetoresistive (MR) angular sensor systems of the KMA family are ideal for a variety of engine control applications to measure the position of throttle, EGR and various flaps of the intake air and exhaust system. Also the MR based rotational speed sensors are widely used to measure the wheel speed and NXP provides customized solutions. These MR devices provide an output signal virtually independent of magnet tolerances, magnet temperature coefficients, magnet-sensor distance and positioning tolerances, guaranteeing reliability and simplifying your manufacturing process.

Our silicon-based temperature sensors, which offer a virtually linear characteristic over their entire operating range, ensure highly accurate measurement with a long operating life. The KTY series can be used in systems for overheating protection, and heating control. Used throughout the car, they contribute considerably to a more efficient, safe, and more comfortable ride.

I/O protection
NXP offers a series of ESD protection devices out of the PESD family, specifically designed to protect automotive networks. The MMBZ series offers single line bidirectional or dual-line unidirectional transient overvoltage protection in a small SOT23 package. Surge protection up to 600W is assured by the Transient Voltage Suppressor (TVS) product family.

Low Ohmic Power MOSFET devices in advanced TrenchMOS technology allow robust reverse polarity protection solutions.

Glue logic
Beside a complete portfolio of standard logic products with different supply voltage range and speed in innovative packages, NXP offers dedicated devices as low Ohmic analog switches, analog and digital multiplexers and I/O expansion devices to strive for cost optimized engine control solutions.

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