|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||F02B-037/10 F02D-041/10 F02B-039/10 F02B-037/04 F02B-037/12 F02B-037/14 F02B-037/16 F02B-037/18 F02D-041/00 F02B-039/16|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 0 인용 특허 : 11|
Methods and systems are provided for controlling boost pressure in a staged engine system comprising a turbocharger and an upstream electric supercharger based on altitude. During vehicle operation at higher altitudes, where vacuum availability for wastegate actuation is limited, boost pressure may be provided by operating the electric supercharger more aggressively. The wastegate may be used for boost control once the vacuum reserve is replenished.
1. A method for a vehicle with a boosted engine, comprising: in response to an increase in driver demand, accelerating a first compressor staged upstream of a second compressor to provide a flow of compressed air to a piston engine, the first compressor driven by an electric motor, the second compressor driven by a turbine;adjusting operation of the first compressor based on an altitude of vehicle operation,during the accelerating, closing a bypass valve coupled in a bypass across the first compressor to increase air flow through the first compressor;whi...