초록 ▼

An electronically controlled wastegate valve is adjusted so that the pressure drop across a throttle in the engine approaches an adaptively generated, desired throttle pressure reserve value. The desired throttle pressure reserve value is based at least in part on a history of the engine load. In th

An electronically controlled wastegate valve is adjusted so that the pressure drop across a throttle in the engine approaches an adaptively generated, desired throttle pressure reserve value. The desired throttle pressure reserve value is based at least in part on a history of the engine load. In the preferred embodiment, the engine speed is used as a surrogate for engine load to determine the desired throttle pressure reserve value. The desired throttle pressure reserve value is preferably pushed downward over time by use of a constant negative gain term in the electronic controller. In this manner, the wastegate control provides sufficient throttle pressure reserve for satisfactory load acceptance when engine load is fluctuating, yet minimizes throttle pressure reserve to improve engine fuel consumption when the engine load is relatively steady.

대표청구항 ▼

[ I claim:] [1.] A turbocharged internal combustion engine comprising:an engine;a turbocharger having a turbine and a compressor;a throttle connected between the compressor and the engine;an upstream pressure sensor sensing the pressure upstream of the throttle between the throttle and the compresso

[ I claim:] [1.] A turbocharged internal combustion engine comprising:an engine;a turbocharger having a turbine and a compressor;a throttle connected between the compressor and the engine;an upstream pressure sensor sensing the pressure upstream of the throttle between the throttle and the compressor, the upstream pressure sensor generating an upstream pressure signal in response thereto;a downstream pressure sensor sensing the pressure downstream of the throttle between the throttle and the engine, the downstream pressure sensor generating a downstream pressure signal in response thereto;an engine load sensor that generates an engine load signal;an electronic controller that inputs the upstream and downstream pressure signals and the engine load signal and outputs a wastegate control signal; anda wastegate connected between the engine and the turbine that diverts engine exhaust away from the turbine in response to the wastegate control signal;wherein the wastegate control signal depends at least in part on a history of the engine load signals.