Engine operation 2

System Operation

 The engine tuning is performed by the PCM.
PCM aggregate information from various sensors and switches. It also contains information on the PCM CAN bus control modules other data. All this information is processed and used in the PCM to control and regulate the various actuators. This is the throttle valve control unit, the injectors, the adjustment of the camshafts and the ignition coils. Some values ​​are transmitted to other systems via the CAN data bus. Overview The following functions are set and controlled by the PCM: Process start Fuel supply to the engine with lambda control Ignition timing with knock control Idle control Valve timing through the camshaft adjustment of intake and exhaust, with internal recirculation of exhaust gas Refrigerant compressor Valve EVAP vapor recovery fuel The fuel supply to the engine via sequential multipoint injection. Ignition is the responsibility of a system without distributor with a set of ignition coils that feeds all cylinders ignition voltage. The ignition is adjusted for each cylinder. Process start PCM releases the engine start, when played by a PATS key which transmits a valid code. This code is then checked in the GEM and compared with the stored code. If the code is considered correct, a comparison with other modules must still be performed. It is only when this comparison is that the successful start is released in the PCM. The active PCM mass on the starter relay, which transmits power to the starter solenoid. When the engine reaches a certain speed, the PCM cuts the starter relay and thus the starter. This saves the starter. When the engine slowly or not at all turns, the startup is interrupted by the PCM. Calculating the pitch angle of the distribution The Duratec Ti-VCT 16V 1.6L (Sigma) has two camshafts operating independently. This allows the PCM to adjust the valve timing continuously, independent intake and exhaust side. Adjusting the valve timing is done by the PCM based on a first depending on the load and engine speed calibration. Advantages of this system: high and best features of couple lower fuel consumption optimization in terms of emissions Continuous adjustment of the camshafts by the PCM is provided by the solenoid Acronym.VVT {}, the control units and two sensors CMP. The interval timing camshaft controllers operating on the principle of pallets is 52 KW and 47 KW admission to the exhaust. When the engine starts, the two camshafts are mechanically locked in their position. The intake camshaft timing advance in maximum, and the maximum delay in exhaust. The regulation is divided into four main areas: low speed and low load partial load low speed and heavy load high speed and heavy load In case of low speed and low load, the exhaust valves open earlier and the intake valves open late. This results in low fuel consumption and a smoother idle. Partial load, the exhaust valves open late and the intake valves open late. The late opening of the exhaust valves makes good use of the expanding gas in the cylinder. The closing of the exhaust valves after TDC allows an EGR (exhaust gas recirculation) internally via the shedding of exhaust gas in the combustion chamber. Moreover, the inlet valves are closed after the bottom dead center and thus allow the reflux of the mixture of fresh gas and exhaust gas in the inlet. This results in reduced fuel consumption and less pollution and waste. In case of low speed and heavy load, the exhaust valves open late and the intake valves open early. Due to the overlap of the opening of valves under the TDC, columns pulsed gas in the combustion chamber are used to obtain a better filling of the combustion chamber. The result is a high torque at low revs. In case of high speed and heavy load, the exhaust valves open early and intake valves close late. As a rapid movement of the gas is required at high speed, the pre-opening of the exhaust valves allows a better discharge of the exhaust gas and the late closing of the intake valves allows a higher rate of filling of the cylinder. Better power efficiency is thus achieved.