Fuel Injection Systems: Operation and Functionality

Classifying Intermittent Injection Systems

Sequential: Fuel injectors provide fuel in a synchronized manner when the valve is open.

Semisecuencial: Fuel injectors trigger in couples every turn of the motor.

Simultaneous: Fuel injectors provide fuel at all times.

Accumulator Functions in NMEC Fuel Injection System

The accumulator keeps fuel pressure in the circuit after the engine stops, and it dampens the noise produced by the fuel pump.

Difference between Injection and Sequential Semisecuencial

The sequential injection fuel injectors provide fuel in a synchronized manner when the intake valve is open. The injection nozzles are driven by semisecuencial couples every turn of the motor.

No Combined Injections System

The combined injection systems are those where the same control unit integrates injection and ignition systems.

Five Key Parts of KJetronic Injection

• Measuring flow of combustible.
• Preparation of air.
• Fuel supply to the mixture.
• Heating phase.
• Regulation of idling speed.

Sprints and Long-Tube Plate

If the race of the plate tube is short, the control plunger moves only slightly, thus releasing a small section of light, and it provides little fuel quantity. With a long run, the plunger releases more control, with input of fuel injectors is greater.

Plunger Mission Control

Allow passing through the fuel supply until the differential pressure valves and the injection.

Effects on Air Injection Valves

Improved mixing and preparation of special idling, thus reducing consumption and pollutant gas emissions.

Regulator Phase of Heating Device with Enrichment for Load

This controller serves to enrich the mixture for fuel with global warming of the engine, with the offset fuel quantity that condenses onto the cool walls set of the admission, and enriches the mixture while the engine is cold in the heating phase.

KEJetronic System

The KEJetronic system is a mixed system, combining the mechanical K-Jetronic system and incorporating an electronic control unit that controls many functions.

Differences between Additional Air Valve and Rotary Actuator Idling

When the engine valve is cold, the additional air step allows more air even when the throttle is closed during acceleration. By bypassing a short duct, the butterfly leaves and achieves a high gas velocity. During idle and the warming period of the engine, the rotary actuator is used to fulfill the same function and stabilize the valve at idle. The rotary actuator system is supplied to the motor through a bypass duct of the throttle, with more or less air depending on the difference between the idling regime and the theoretical instant. The UCE system is responsible for supplying a signal to the actuator in command function of the speed and engine temperature.

Electrohydraulic Actuator Operation Pressure

The pressure actuator modifies the lower chambers of the differential pressure valves distributor-dispenser in function of the state of the motor function signal by current drawn control. Thus, it modifies the fuel flow dosed at injection valves.

Component Responsible for Pressure Less Than System Pressure in a Cold Engine in the K-Jetronic System

The regulator of the heating phase.

Enrichment of the Mixture During Cold Start in K-Jetronic and KE-Jetronic Systems

When the engine is stopped and cold, the driver turns the key to the starting position, the current from the relay passes to the cold start injector, and it activates its internal coil and leaves open the step of the combustible. At the same time, the current flows to the nozzle of the cold boot, so does the Thermo-time switch, which provides a resistance on a bimetal. When this resistance is heated, it bends the blade, cutting off its return to earth of the cold start injector, so that the electromagnet is turned off and prevents further gas flowing. This timed switch acts as the time that remains in contact depends on the stream that passes through the resistance, and is estimated between 8 and 12 seconds. If the cold start injector is not disconnected, it could easily drown the motor, in which case it would start up after a very difficult time. The system is disconnected immediately when the driver leaves the starting position.