Adjustable stars camshaft

4. In the cooling system used a new plastic thermostat module with electronic control and adjusting the multidimensional characteristic. 5. In the mechanical part of the engine installed cylinder head and cylinder block of the new design. Optimized the work of a crank drive and drive cams. 6. In addition to the engine installed a new oil pan, the standard for all engines of the third generation of the family.

Continuous adjustment of camshafts used on gasoline engines Z 18 XER DOHC-I to reduce harmful emissions and fuel consumption. Adjustable camshaft provides an additional means to control the engine in case of load changes. At idle speed decreases the engine speed and optimized performance setting minimum overlap valves. When partial loads to ensure low fuel consumption and minimal emissions changes position and length of time of overlapping valves. When the full load, increase the maximum torque and power is achieved by optimizing the installation time of closing of the intake valves. Camshaft adjustment system consists of the following sites: - Adjusting module; - Control valve; - The oil line to the valve; - The oil line from the valve chamber to «A» regulator of camshaft; - The oil line from the valve chamber to «B» the regulator of camshaft; - A gear with the camshaft sensor; - Engine control module. Situation camshaft drive the intake valves changes within 60 ° angle of rotation of the crankshaft. When the camshaft drive intake valves "delayed", the content of the residual gas in the cylinder decreases as the overlap inlet / exhaust valve is also reduced. This means that the cylinder is filled with mostly fresh mixture.

Fig. 2.3. Node camshaft engine Z

18 XER DOHC-I: 1 - Hydraulic Solenoid valve camshaft drive intake valves, 2 - Hydraulic Solenoid valve camshaft drive of the exhaust valves, 3 - sensor camshaft drive intake valves, 4 - sensor camshaft drive exhaust valves 5 - crankshaft sensor, 6 - engine control module; 7 - choke tube

When advance camshaft drive exhaust valve increases, the overlap of valves also increased to 45 ° angle of rotation of the crankshaft. Here, because of the vacuum in the intake manifold, increasing the number of products of combustion falls back into the cylinder of exhaust ports.

Fig. 2.4. Scheme adjust camshaft

engine Z 18 XER DOHC-I: 1 camshaft drive intake valves, 2 valve camshaft adjustment, 3 camshaft drive of the exhaust valves, 4 - control camshaft drive exhaust valves, 5 - control camshaft drive intake valves, 6 -- camshaft bearings