A power system including an engine, an intake system, an exhaust system, and an EGR system. The intake system is coupled to the engine and receives a fresh intake gas, the fresh intake gas having a fresh intake gas pressure. The exhaust system is coupled to the engine and expels an exhaust gas, the
A power system including an engine, an intake system, an exhaust system, and an EGR system. The intake system is coupled to the engine and receives a fresh intake gas, the fresh intake gas having a fresh intake gas pressure. The exhaust system is coupled to the engine and expels an exhaust gas, the exhaust gas having an exhaust gas pressure. The EGR system is positioned so as to couple the intake system and the exhaust system. The EGR system does not comprise an EGR cooler. The EGR system bypasses periodically a portion of the fresh intake gas around the engine, from the intake system to the exhaust system, when the fresh intake gas pressure is greater than the exhaust gas pressure.
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1. A power system, comprising: an engine;an intake system being coupled to the engine and configured to receive a fresh intake gas, the fresh intake gas having a fresh intake gas pressure;an exhaust system being coupled to the engine and configured to expel an exhaust gas, the exhaust gas having an
1. A power system, comprising: an engine;an intake system being coupled to the engine and configured to receive a fresh intake gas, the fresh intake gas having a fresh intake gas pressure;an exhaust system being coupled to the engine and configured to expel an exhaust gas, the exhaust gas having an exhaust gas pressure; andan exhaust gas recirculation (“EGR”) system, the EGR system being positioned so as to couple the intake system and the exhaust system, the EGR system comprising an EGR valve positioned between the intake system and the exhaust system, the EGR system not comprising an EGR cooler, the EGR system being configured to bypass periodically a portion of the fresh intake gas around the engine, from the intake system to the exhaust system, when the fresh intake gas pressure is greater than the exhaust gas pressure, and the EGR valve being configured to be at least partially open when the fresh intake gas pressure is greater than the exhaust gas pressure, when the engine is simultaneously operating at a speed lower than a peak torque speed, and when the engine is simultaneously loaded to a torque level of at least 65% of a maximum torque level for a respective speed. 2. The power system of claim 1, wherein the EGR system does not comprise an EGR mixer. 3. The power system of claim 1, wherein the EGR valve is configured to be completely open when the fresh intake gas pressure is greater than the exhaust gas pressure. 4. A method for a power system, the power system comprising: an engine;an intake system being coupled to the engine and configured to receive a fresh intake gas, the fresh intake gas having a fresh intake gas pressure;an exhaust system being coupled to the engine and configured to expel an exhaust gas, the exhaust gas having an exhaust gas pressure; andan exhaust gas recirculation (“EGR”) system, the EGR system being positioned so as to couple the intake system and the exhaust system, the EGR system not comprising an EGR cooler, the method comprising:bypassing a portion of the fresh intake gas around the engine via the EGR system, from the intake system to the exhaust system, when the fresh intake gas pressure is greater than the exhaust gas pressure; anddetermining whether the engine is operating at a speed lower than a peak torque speed, and the bypassing occurs based at least in part on the determination that the engine is operating below the peak torque speed. 5. The method for a power system of claim 4, wherein the EGR system does not comprise an EGR mixer. 6. The method for the power system of claim 4, wherein the bypassing comprises opening an EGR valve at least partially. 7. The method for the power system of claim 4, wherein the bypassing comprises opening an EGR valve completely. 8. The method for the power system of claim 4, wherein the power system comprises a turbocharger coupled to the intake system and the exhaust system, and the method comprises determining whether the turbocharger is providing an adequate boost level, the adequate boost level is a boost necessary to power the engine at a respective time, and the bypassing is based at least in part on the determination that the turbocharger is not providing the adequate boost level. 9. The method for the power system of claim 4, comprising determining whether a fuel source being provided to the engine has been abruptly cut off from the engine, and wherein the bypassing is based at least in part on the determination that the fuel source has not been abruptly cut off from the engine. 10. The method for the power system of claim 4, wherein the exhaust system comprises diesel oxidation catalyst (“DOC”) downstream of the engine and a diesel particulate filter (“DPF”) downstream of the DOC, and the method comprises determining whether a temperature of the exhaust system is above a threshold temperature, the threshold temperature is a temperature necessary to maintain proper operation of the DOC and DPF for a respective operating mode of the engine, and the bypassing is based at least in part on the determination that the temperature of the exhaust system is above the threshold temperature. 11. The method for the power system of claim 4, comprising determining whether the torque level is at least 65% of a maximum torque level for a respective speed, and the bypassing occurs based at least in part on the determination that the torque level is at least 65% of the maximum torque level for the respective speed.
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