Turbocharger and EGR technology
Recently in order to improve the thermal efficiency of diesel engines and power output, high-pressure injection method for direct injection, turbocharger and high torque through a high-technology. In the common areas of the low-speed high-torque boost can bediesel, gasoline is more likely to achieve than small displacement and high-speed cruise in the low speed, fuel economy is getting better. The use of VG turbo, not only to get the flat torque curve ideal car, but also to reduce smoke and to improve low-speed acceleration. In addition, recent studies using two-stage turbo, etc., to make up for lack of acceleration of the air. From the perspective of reducing emissions is expected in the future for high-charged, high EGR demanding. EGR is very effective to reduce NOx technology.
Common rail injection technology
In a variety of new technologies, the diesel engine is the most efficient common rail injection system. Maximum injection pressure common rail injection system and an increase in the minimum injection interval is shortened to achieve rapid progress. Each cycle of dissatisfaction with the meager drop of eye drops the same amount of fuel, and can create almost 2000 atm pressure in the microsecond period of time fractional jet technology properly shocked the world. Recently, the injector controller driver change from the electromagnetic piezoelectric control valve of the response of 2 times. Future common-rail fuel injection sent inside the booster piston in further booster injection pressure will be more than 20 atmospheres.
Combustion engine
After more than 10 years of uniform pre-mixed compression ignition (HCCI) combustion technology for high load is not reality, only for the exhaust temperature is low, the low rate of post-processing part of the load area clean. Thus in the high-load and no load is very low near the load to the usual dual-mode operation of diesel combustion as an effective way. This mode conversion is also possible to use common-rail. Because this part of the load operation is closer to the injection compression top dead center during the set, so do not even pre-mix of a uniform, known as "pre-mix of burning" than is called "HCCI combustion" more accurate . In addition, the near field of the usual no-load combustion mode, even if the use of EGR limit NOx, PM emission levels are low, so the unburned HC and CO than the increase of pre-mixed combustion is more favorable.
Exhaust after-treatment technology
EGR alone and common rail technology, such as the combustion engine is impossible to make both NOx and PM to meet Japan's current new long-term emissions regulations. Diesel exhaust after-treatment will assume the main task of the engine exhaust purification. PM with a DPF cleaning to reduce emissions, to reduce NOx emissions, the use of SCR or NSR purification technology.
Diesel hybrid
Now City are basically gasoline engine. In order to further improve fuel economy, very necessary to use diesel hybrid. The latest dieselhybrid passenger car fuel consumption and exhaust emissions results are very good. And very likely for passenger cars.
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