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Home >> Land Rover >> 2018 >> Range Rover Velar First Edition >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Fuel Charging And Controls - Turbocharger - TDV6 3.0L Diesel -- Range Rover Velar/L560 >> Fuel Charging And Controls - Turbocharger - TDV6 3.0L Diesel >> Description And Operation >> Turbocharger (G2006270) >> Operation >> Bi-Turbocharger Operation

Bi-Turbocharger Operation

When the engine operating parameters approach the limits (approximately 2800 Revolutions Per Minute (RPM) under load) of the primary turbocharger, dual mode boosting control software within the Powertrain Control Module (PCM) begins the switch to parallel bi-turbocharger operation. The secondary turbocharger is brought into operation by the opening of the turbine intake shut-off valve which allows exhaust gases to flow through the turbine.

Initially, the secondary turbocharger does not produce a boost pressure to equal that of the primary turbocharger. Therefore, the initial boost pressure from the secondary turbocharger is supplied via the charge air recirculation solenoid into the clean air inlet for the primary turbocharger. As the secondary turbocharger boost pressure output increases: the recirculation valve is then closed and the compressor shut-off valve opened to increase the boost pressure from the secondary turbocharger which is directed into the charge air radiator.

When the secondary turbocharger has reached the required operating parameters, the charge air recirculation shut-off valve is closed and the compressor shut-off valve is opened. The PCM will maintain the engine operating in bi-turbocharger operation with both primary and secondary turbochargers contributing to the air charge induction. When the dual mode boosting software determines that the engine operating parameters no longer require the use of dual mode boosting, the system switches back to mono turbocharger operation.

If the engine idles for more than 3 minutes, the secondary turbocharger is actuated by opening the turbine intake shut-off valve to provide correct sealing of the turbine shaft seals. In addition the compressor end sealing is achieved by feeding pressurized air to the shaft seal cavity through a pipe which is connected to the charge air system.

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