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柴油机的低排放与经济性是相互矛盾的,为降低制造成本和运行费用,必须进一步采取机内净化措施降低柴油机 的原始排放和燃油耗,其中燃油喷射系统依然起着十分重要的作用。Bosch公司正在研制的一种增压式压电共轨喷射系 统(APCRS),不但能以较低的共轨压力获得比一般共轨系统高得多的喷油压力,而且除能进行多次预喷射和后喷射外, 还能使主喷射的喷油率形状从矩形变化到斜坡形直至靴形,与柴油机的运转工况达到最佳的匹配,在宽广的发动机特性 曲线范围内显示出明显降低排放和燃油耗的潜力。
Diesel low emissions and economy are contradictory, in order to reduce manufacturing costs and operating costs, we must further purify the internal mechanism to reduce the original diesel engine emissions and fuel consumption, of which the fuel injection system still plays a very important role. Bosch is developing a pressurized piezoelectric common rail injection system (APCRS), not only with lower common rail pressure than the average common rail system is much higher injection pressure, and in addition to being able to make multiple pre- Injection and post-injection, but also to make the main injection of fuel injection rate shape from rectangular to ramp until the boot, and diesel engine operating conditions to achieve the best match in a wide range of engine performance curve showed a significant reduction Potential for emissions and fuel consumption.