| 摘要 |
Cylinders of an internal combustion engine are provided with an exhaust port that is opened when the piston approaches bottom dead center. Exhaust in the cylinder at the end of the power stroke flows to an EGR tank for containment and cooling. During the intake stroke as the piston approaches bottom dead center, the exhaust port is reopened allowing gas from the EGR tank to flow into the cylinder as a portion of the charge prior to compression. Alternatively, the exhaust port on a first cylinder is connected to the exhaust port on a second cylinder to allow exhaust gas from the power stroke on the first cylinder to flow into the intake stroke on the second cylinder. Pulsed turbocharger systems comprise an internal combustion engine comprising a piston cylinder and a piston slidably disposed within the cylinder. The cylinder includes an exhaust gas port that is disposed through a wall section of the cylinder. The exhaust gas port is positioned near a bottom portion of the cylinder such that: (1) an opening of the port is exposed when the piston is at the bottom of its stroke within the cylinder; and (2) an opening of the port is covered when the piston is moved towards the top of its stroke. A turbocharger that is connected to the engine and comprises a turbine wheel that is in exhaust gas flow communication with the exhaust gas port. Pulsed exhaust gas exits the piston cylinder through the exhaust port, when the piston is near a bottom portion of its work stroke. This pulsed exhaust gas is directed to the turbine wheel to cause the turbocharger to produce boost air for directing to the engine. |
