TSI engine supercharging is a technology of direct fuel injection and turbocharging. For the first time the TSI supercharger concept was developed and patented by Volkswagen, which presented an effective internal combustion engine with unique technical characteristics. TSI engines use a conceptually new system – double and turbocharging. All cars are accepted for recycling, including those with this system: https://scrap4cash.com.
TSI engine with a double supercharger
The double supercharging system is applied depending on what device is installed in the internal combustion engine – a mechanical supercharger or a turbine compressor.
To realize a twin supercharger, the Roots mechanical supercharger is often used, which consists of two rotors mounted in a housing. The rotation of the rotors is reversed so that the air mass is sucked in on one side and compressed and pressed out on the other side.
The supercharger is activated by a belt-driven crankshaft which is started by a magnetic coupling. A special flap regulates the supercharging pressure.
The twin supercharger engine uses a standard type turbine compressor and the air mass is cooled by an intercooler.
The DDC (control system) consists of operating mechanisms and elements:
input transducers of boost pressure, pipeline pressure, inlet manifold pressure, potentiometer;
mechanisms of execution – clutch of magnetic type, servomotor, pressure limiting valve, valve for compressor recirculation process.
The main purpose of the DMS is to control the operation of the twin supercharger system.
This element is activated by the control unit with further voltage applied to the coil. The magnetic field created provides the attraction between the friction disc and the pulley. The mechanical blower rotates for as long as there is voltage to the coil.
It is used to rotate the damper. While the damper is closed, the air mass is supplied to the compressor. The supercharging pressure level is controlled at the time the damper is open. Some of the air enters the compressor while reducing the boost pressure. When the compressor is off, the damper remains open.
Pressure limiting valve
This element is activated during the creation of excessive boost pressure. The valve is directly connected to a vacuum type actuator which is designed to open the bypass valve.
The valve is responsible for the operation of the supercharger system in a closed throttle-type damper mode. It is designed to prevent excess pressure from building up between the turbo compressor and the choke.
The TSI twin supercharger system can have several operating modes:
Non-supercharged mode – the crankshaft speed is no more than 1,000 rpm;
mechanical supercharger operation mode – at 1,000 to 2,400 revolutions per minute;
operation of turbine compressor and mechanical supercharger simultaneously – at rotation speed from 2400 to 3500 rpm;
turbine compressor operation mode – rotation speed exceeds 3,500 rpm.
Turbocharged TSI engine
To implement the turbocharging system in such engines, a turbine compressor is used, which provides torque in the range of 1,500 to 4,000 rpm.
A bypass valve is used to regulate the boost rate, which can be electrically or pneumatically actuated. The main operating element of the pneumatic actuator is the solenoid valve, while the electric actuator is an electric motor consisting of a gear, lever and position sensor.
TSI engines equipped with a turbocharging system use a liquid cooling system. Such a system has a separate cooling circuit, which includes – cooler, pump, radiator and piping. The charge air cooler is located in the manifold and consists of thin aluminum plates and cooling tubes.
The charge air cooling process is controlled by the engine control unit via a pump. The heated air is fed to the plates and is then cooled by the liquid, which moves through the circuit.