Hella (Hella) at the end of the month , " Technology Exhibition 2013 people and cars ," unveiled a new electric turbocharger wastegate valve. According to reports, the application of this electric exhaust gas turbocharger valve technology can improve their response , precise control of turbo boost pressure is expected to put into use in 2014 .(AUDI TT Quattro turbocharger)
Conventional turbocharger wastegate valve is to provide a vacuum tank ( vacuum ) force in the booster reaches a certain value , the valve opens to relieve pressure push to decrease the work intensity of the turbocharger .( GT1749V turbocharger)
The electric motor exhaust valve is through the use of energy to achieve the opening and closing of valves, mainly by DC motors , levers and bypass valves. Since the temperature of the turbine casing is working reach thousands of degrees, so the motor can not be installed directly on the turbine housing.
Instead, the DC motor is disposed in the compressor housing through long lever inside the turbine wheel to drive the exhaust valve during operation of the heat-resistant temperature of the motor is about 140 ℃. Up to 105 ° rotation angle of the electric motor by controlling the exhaust gas bypass valve, the rotating speed up to 0.45 degrees per millisecond. ( Image source Nikkei Technology Online )( http://www.maxspeedingrods.co.uk/toyota-estima-2-0l-d-4d-1cd-ftv-gt1749v-turbo-turbocharger-721164.html)
Conclusion: Compared with traditional vacuum booster exhaust gas from the bypass valve is concerned, the use of electric motor control valves apparently can improve turbocharger response, but also in the different engine operating conditions, are available through the motors to accurate control of the opening degree of the wastegate valve.