Pneumatic compressor recirculation valve system for minimizing surge under boost during throttle closing

An engine system comprising:

• a compressor coupled to an engine and supplying air to an intake manifold;
• a throttle controlling the supply of air from the turbocharger to the intake manifold;
• a vacuum reservoir;
• a first aspirator having its motive section in fluid communication downstream of the compressor and its discharge section in fluid communication upstream of the compressor, wherein a suction port of the first aspirator is in fluid communication with the vacuum reservoir;
• a compressor recirculation valve having a pneumatic control chamber in fluid communication with downstream air from the compressor and in fluid communication with the vacuum reservoir;
• a gate valve controlling the fluid communication of the pneumatic control chamber of the compressor recirculation valve with the downstream air and the vacuum reservoir, the gate valve having a pneumatic control chamber;
• and
• a second aspirator having its motive section in fluid communication with an inlet of the throttle and its discharge section in fluid communication with an outlet of the throttle, wherein the suction port of the second aspirator is in fluid communication with the pneumatic control chamber of the gate valve.