Method and system for improving starting of a turbocharged engine
A system and method for improving engine emissions is described. In one example, engine emissions may be improved via increasing rotational resistance of a turbocharger while a temperature of an exhaust after treatment device is less than a threshold temperature. The system and method may reduce an amount of time for the after treatment device to reach an operating temperature. 1. A kind of engine system, comprising: Engine; Connected to the engine turbocharger, the turbocharger includes a turbocharger to increase and to reduce the rotary resistance of the device; and Controller, which includes in response to the temperature of the after-treatment device via the device adjusting the turbo-supercharger of the rotary resistance non-transient state instruction. 2. Engine system according to Claim 1, wherein the device is a hydraulic actuated device, and wherein in response to the temperature of the after-treatment device is lower than threshold temperature to regulate the turbocharger rotating resistance. 3. Engine system according to Claim 1, wherein the device is a power actuated device. 4. Engine system according to Claim 1, wherein the device is a brake. 5. Engine system according to Claim 4, wherein the brake comprises a with the turbo shaft and the rotor of the mechanically connected. 6. Engine system according to Claim 1, wherein the device is an electric machine. 7. Engine system according to Claim 6, wherein the electric machine is an alternator. 8. A kind of engine system, comprising: Engine; Connected to the engine turbocharger, the turbocharger includes a turbocharger to increase and to reduce the rotary resistance of the device; and Controller, which includes in response to the temperature of the after treatment device through the device for the regulation of the rotational resistance of the turbocharger non-transient state instruction, the controller includes an engine torque request in response to the rotational resistance regulate turbocharger further non-transient state instruction. 9. Engine system according to Claim 8, wherein the device and the turbocharging shaft is connected mechanically. 10. Engine system according to Claim 8, also includes a turbo-supercharger of the engine and the exhaust valve in response to the level of air flow less than that of the exhaust valve to open the additional non-transient state instruction.