Fuel Injection System

Fuel Injection System


General Provisions
Fuel injection engines 4A-FE, 4A-OE. 5A-FE and 7A-FE are fuel injection system into the intake manifold with the electron-electron controlled fuel injection according to the basic control ¬ ing factors. They have many common or similar elements, which simplifies ¬ schaet description of their device, as well as the inspection and dismantling times, sample size, the assembly of the elements. Their main common feature is the electronic control unit,which generates control signals to sensors ¬ lyayuschy signal to the nozzle. However, the specific implementation of circuitry injection system is different for every individual ¬ engines and even for the same engine but designed for different models.
These differences are primarily due to the choice of ¬ HN CEO option fuel: air flow, or absolute pressure in the intake manifold, in the 1st case studies enjoys ¬ meter of air, and in the 2 - m - absolute pressure sensor in the intake manifold. Furthermore, these differences you out to be the presence or absence of:
• 3-component catalyst exhaust gas;
• cold start injector motor ¬ telya;
• EGR otrabo tavshih-gas emissions;
• air conditioner (if it exists, a system of forced ¬ Nogo increase the speed of idling in turn con ¬ ditsionera);
• Automatic transmission (if there is additional ¬ Consequently the control channel);
• Control speed of idling (au ¬ matic stabilization of the speed-load);
• Control supply excitation ¬ spirit (bleed air for Drosia ¬ selnuyu damper on regimes with nuditelnogo ¬ idle);
• speed sensor;
• a system of variable geometry intake manifold;
• vapor recovery system of fuel from the fuel tank and the intake manifold, etc.
In this regard, here are all variants of the scheme systems vpry ska-fuel engines designed for the 4A-FE, 4A-CE, 5A-FE and 7A-FE. However, the very description of the systems and procedures for inspections of elements of these systems ¬ Comrade conducted in parallel with specific structural features of a system for a particular engine or for con ¬ Concretely car model.
Description of the fuel injection system
Consists of three major subsystems in order, the supply of fuel, feed the spirit and the possibility ¬ e-government.
Fuel system
This system is similar in all T ¬ groin examined engines. Fuel system - flow type with continuous circulation of fuel and the return of the fuel in a tank-plivny highway through the inverse drain. It includes (see diagram):
• fuel tank, fuel pump with an electric drive installed, we have in the tank;
• fuel filter;
• fuel pressure regulator;
• Highway Backleak top ¬ Lebanon (on which part of the fuel back into the tank);
• working nozzles mounted in sockets ¬ nye intake collector ¬ torus front intake valves (the serial version of the engine) or a cylinder head nozzles cylinder ditch (an option with the system of the Organization of the workflow engine and engine management systems, ensuring ¬ framing the work of the engine Poor the mixture composition, developed by ¬ tannaya TOUOTA);
• cold start injector motor ¬ telya established in the general ¬ ka Nala intake manifold.
Fuel pressure regulator expressed support a permanent difference in the Inter-forward fuel pressure before the nozzle whose work ¬ and the air pressure in the intake manifold. In this case, ¬ case quantity of fuel is uniquely determined by one ¬ time ¬ covered from the state of the nozzle. The magnitude difference
pressure. 284 kPa (2.9 kg/cm2)
Ne-regulation is part of repuskom fuel tank through a valve and main fuel drain back.
The fuel pump is switched on immediately after turning on the ignition. Fuel at a constant pressure differential is applied to the (working) form, figure, which was injected fuel in ¬ in the intake manifold tubes immediately before the intake valves. Fuel quantity is determined by long-term control pulse Stu ¬, ¬ ry which is given in accordance with the sig ¬ nalom electronic control unit of ¬.
Cold start injector engine delivers fuel into a common channel is continuously intake manifold only when you start a cold engine. Duration of fuel is determined ¬ determined duration of the relay nozzles termovremennogo ho ¬ lodnogo start, which included together in turning the lock of ignition ¬. Duration of the relay for ¬ depends on coolant temperature.