These fuel injection systems were considered to be really reliable and trustworthy.
The electric pump is a roller cell pump which delivers fuel from the tank to the fuel rail at a pressure of approximately 5 bar. The roller cell pump is driven by a permanent magnet electric motor. It consists of a roller race plate which is eccentric in shape. A rotor plate with notches 4 to 6 around its circumference is placed eccentrically inside the roller race plate.
Each notch is provided with a roller. The roller race plate has an inlet port and an exit port. When the engine is switched ON, the electric motor drives the pump. The motor drives the rotor plate inside the roller race plate. Due to the eccentric shape of the race plate, the rollers in the rotor move outwards pressing against the roller race plate due to centrifugal force.
The fuel is trapped between the roller and the notch in the inlet port side and as the rotor rotates towards the exit port side, the fuel is pressurized and sent out through the exit port.
Fuel accumulator is provided to maintain the pressure in the fuel system for a certain amount of time after the engine is switched OFF.
This is done in order to help in easy restarting of the engine, especially when the engine is hot. The accumulator is divided into 2 chambers with the help of a diaphragm. One chamber acts as the fuel accumulator and the other chamber is connected to the atmosphere.
When the engine is running, the fuel enters the accumulator volume and pushes the diaphragm against the spring force. The diaphragm moves until the springs halt in the spring chamber.
Thus the fuel collected at this point is the maximum accumulator volume. Fuel filter is often a combination of a paper filter, followed by strainer. This ensures higher degree of filtration. A pressure regulator is fitted to one end of the fuel distributor.
It is used to maintain the pressure in the fuel system constant at about 5 bar. It consists of a plunger which slides in the regulator against a spring.
When the fuel supplied by the fuel pump exceeds the limit, the plunger moves against the spring to open the exit port. This allows the excess fuel to return to the fuel tank and thus maintaining the pressure.
When the fuel delivery quantity is lower, the plunger shifts back closing the exit port to allow less fuel to escape to the tank. The constant shifting of the plunger maintains the pressure in the rail. Fuel injection valve open at a given pressure and atomize the fuel and inject onto the intake valves.
They have a valve needle which sit on a valve seat. When the pressure is high enough, for e. The valve needle oscillates at a high frequency when operated.
This results in excellent atomization of the fuel even if it is of small quantity.
The air flow sensor here works on suspended body principle. As we are aware that the air flow quantity will decide the fuel injection quantity, accurate measurements of the air flow is required. The air flow sensor is located upstream of the throttle valve. It consists of an air funnel over which a sensor plate is free to pivot.
The air flowing through the air funnel deflects the sensor plate from its zero position to a certain amount.
This movement of the sensor plate is transmitted to a control plunger of the fuel distributor via a lever. The movement of the control plunger decides the quantity of fuel to be injected.
Depending on the position of the sensor plate in air flow sensor, the fuel distributor meters the sufficient quantity of fuel to be distributed to individual cylinders. The movement of the sensor plate is transmitted to a control plunger of the fuel distributor via a lever.
The control plunger moves in a barrel.Approximately up until mechanical fuel injection systems have been installed on certain Mercedes, Audi, Volkswagen, Ford etc. car models – starting with Bosch K-Jetronic, and after that – .
BOSCH L-Jetronic Injection alphabetnyc.com Author: Crit Keywords: Bosch L-Jetronic L Jetronic RX-7 Brought to you by the team at alphabetnyc.com Created Date.
K-Jetronic System overview The K-Jetronic is a mechanically and hydraulically controlled fuel-injection system which needs no form of drive and which meters the fuel as a function of the intake air quantity and injects it continuously onto the engine intake valves. The Program Order Number Gasoline-engine management Emission Control (for Gasoline Engines) 1 Gasoline Fuel-Injection System K-Jetronic 1 Gas olin Eng ine.
Mechanical fuel injection - Bosch K-Jetronic, Bosch K Jetronic The Fuel Filter Due to the extremely fine tolerances within the Bosch K Jetronic system, it is vital that the filter has excellent filtration properties. Apr 28, · K-Jetronic is a mechanically and hydraulically operated fuel injection pump, introduced by BOSCH GmbH in the year The K-Jetronic pump requires no form of drive and one of its features is that it can meter the fuel as a function of the intake air alphabetnyc.com: How Car Parts Work.