Employment engine management system

Fuel from the fuel tank by means of the electric fuel pump is supplied to the power supply system and further to the injectors. The pressure regulator ensures a constant pressure in the system. Electrically controlled fuel injectors inject fuel into the intake manifold immediately before the inlet valves. The engine control unit determines when the fuel injection and the quantity.

The engine is 2.0-liter fuel injection is performed simultaneously via two nozzles each crankshaft revolution. On the other engines injection takes place sequentially in the order of cylinders.

Air sucked engine passes the air filter, the throttle device and further forwarded to the intake valves.

In accordance with the mass of air entering the engine and the measured mass air flow sensor (HFM), is determined by the required amount of fuel injected. MAF sensor is sensitive heated plastiny 1 (Fig. 5.37) is cooled by air passing therethrough. To maintain a constant temperature of the plate current value is changed according to the intake air mass. The engine control unit according to a current value obtained from the flow sensor determines the required amount of injected fuel.

Electronic control unit receiving signals from various sensors and controls for optimum operation of the engine depending on the driving conditions. In case of damage of one of the sensor control unit switches to emergency operation to prevent damage to the engine and to drive the vehicle to the nearest garage. In this mode, the engine is unstable and increases the accelerator pedal may stop.

Elements of the engine management system

The crankshaft position sensor is mounted on the engine block near the flywheel. It tells the control unit the position and engine speed.

Camshaft position sensor located on the cylinder head and indicates the position of the camshaft at the moment.

Throttle position sensor transmits a signal to its angular position.

Switch idling informs the control unit about throttle position when the engine is idling. At full load this switch sends a signal that the throttle is in a position corresponding to the engine at full load.

The coolant temperature sensor is a resistor whose resistance decreases with increasing temperature of the coolant.

Intake air temperature sensor is arranged similarly to the coolant temperature sensor.

Fuel vapors from the tank caught absorber with a solenoid valve. The activated carbon collects fuel vapors that during engine operation resulting in the formation of the vacuum in the intake manifold into the cylinders, where burn.

An oxygen concentration sensor (lambda sensor) is required for proper operation of the catalytic converter, it takes a signal to the control unit of the amount of oxygen in the exhaust gases, as a result of the control unit changes the fuel supply.

The valve control engine speed to idle regulates the amount of air entering the bypass throttle. The result is a constant engine speed regardless of the number of connected users, such as the power steering pump or compressor air conditioning system.

The knock sensor (except the 2.0-liter engine produced before 04.1996 g) is designed to determine the optimum ignition timing.

The device camshaft adjustment (except for engines of 2.0 liters of release till 04.1996 and engine V6). As a result of the electro-hydraulic actuator after the command control unit intake camshaft relative rearranged chain drive. When moving in the direction of "delay" the work of the engine idling becomes softer, respectively, with the engine at high engine speed is increased capacity. At low and medium engine speeds with early closing of the intake valves improves the filling of the cylinder, resulting in increased torque.

Application on-line 6-cylinder engine so-called resonance intake pipe, which, depending on the engine speed changes the length of the intake tract to the cylinder, improves torque characteristic.

The electronic control system Motronic ME, used in the V6 and V8 engines

Motronic ME System is an advanced system of HFM. The fuel injector as well as in the HFM, operate sequentially in accordance with the working cylinder. The main difference - the throttle control by an actuator, which in turn regulates the engine speed at idle. The accelerator pedal is in the system is electronic communication with the engine control unit. The electronic sensor monitors the position of the pedal. Throttle control is performed by the control unit via a servo motor. The control system of the accelerator pedal integrated system provides a more constant speed.