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Diagramas do motor 1.8T

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Carlinho

Consultor Técnico
Iniciador do tópico #2





Management boost pressure implemented an electronic system on the table values of boost pressure.
As a result, boost pressure can be set to a preset value across the rev range engine.
Managemente of boost pressure is carried by the signals transmitted from the engine control unit in the solenoid valve control boost pressure N75. The valve is located in the channel connecting the turbo compressor lower chamber pressure control valves boost. Boost pressure control valve is pneumatically controlled and opens or closes the bypass valve.
The control pressure required for valve control of boost pressure comes from the high-pressure turbocharger.
The value of boost pressure, recorded in the table depends on the position of the throttle and the engine speed.
Maximum boost pressure is 168 kPa.
At low speed is important to ensure a rapid increase in boost pressure. Bypass valve remains closed. Turbocharger ensures engine boost pressure required to achieve high torque.
At high engine speeds corresponding number of exhaust gases directed to bypass the turbine.
Turbine speed decreases.






With cutoff of fuel at high revs due to the pressurization of the closed throttle creates a dynamic pressure. This dynamic pressure is suddenly slows the rotation of the turbocharger compressor wheel.
The next time the vehicle acceleration throttle opens and restores the turbocharger speed (there is a delay turbine). To avoid delay, with a closed throttle valve fuel cutoff bypass exhaust gases to bypass the compressor circuit.
Fuel cutoff valve is a diaphragm with a spring and a pneumatic actuator. It is located in the hose between the cavity of the compressor and turbocharger inlet and is controlled by the vacuum in the intake manifold for throttle.
The vacuum in the intake manifold overcomes the spring pressure valve and, as a result, the cavity of the compressor is connected to the inlet turbocharger.
Consequently, the compressor does not work with critical turnovers and the rotation of compressor wheel slows. Turnovers remain unchanged.
Next, acceleration in the intake manifold vacuum decreases. Fuel cutoff valve is closed and immediately develops a full boost pressure. This ensures rapid acceleration engine.












 
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