公开(公告)号：KR1020110064725A

公开(公告)日：2011-06-15

申请号：KR1020090121440

申请日：2009-12-08

Applicant: 자동차부품연구원

Inventor： 정동영 ,  정재우 ,  김남호 ,  강정호 ,  정수진 ,  강우

IPC: F02M25/07 ,  F02D21/08 ,  F02D41/04

CPC classification number: Y02T10/47 ,  F02D41/0047 ,  F02D21/08 ,  F02D2041/0067 ,  F02D2041/0075 ,  F02M26/47

Abstract: PURPOSE: An EGR(Exhaust Gas Recirculation) system and an EGR rate measurement method are provided to measure an EGR rate accurately even in a transient driving state. CONSTITUTION: An EGR system comprises a first temperature sensor(2), a second temperature sensor(3), a third temperature sensor(4), and a controller(5). The first temperature sensor measures the temperature of intake air after passing through an intercooler installed in an intake pipe. The second temperature sensor measures the temperature of air flowing into an intake manifold after passing through the intake pipe and an EGR cooler. The third temperature sensor measures the temperature of exhaust gas recirculated from an exhaust manifold to the intake manifold after the recirculated exhaust gas passes through the EGR cooler. The controller collects the temperature and flow rate information from the temperature sensors and a flow sensor, calculates the calories of air passing through the intake manifold, the intercooler, and the EGR cooler, calculates the EGR rate by comparing the calorie at the intake manifold with the sum of the calculated calories, and controls an EGR valve according to the EGR rate.

Abstract translation: 目的：提供EGR（排气再循环）系统和EGR率测量方法，即使在瞬态驱动状态下也能准确地测量EGR率。 构成：EGR系统包括第一温度传感器（2），第二温度传感器（3），第三温度传感器（4）和控制器（5）。 第一温度传感器测量通过安装在进气管中的中间冷却器后的进气温度。 第二温度传感器测量在通过进气管和EGR冷却器之后流入进气歧管的空气的温度。 第三温度传感器测量在再循环废气通过EGR冷却器之后从排气歧管再循环到进气歧管的废气的温度。 控制器从温度传感器和流量传感器收集温度和流量信息，计算通过进气歧管，中间冷却器和EGR冷却器的空气的热量，通过将进气歧管的热量与 计算卡路里的总和，并根据EGR率控制EGR阀。

公开(公告)号：KR1020110064724A

公开(公告)日：2011-06-15

申请号：KR1020090121439

申请日：2009-12-08

Applicant: 자동차부품연구원

Inventor： 정재우 ,  강정호 ,  김병수 ,  강우 ,  정수진

IPC: F02D41/34 ,  F02B19/14 ,  F02D41/04

CPC classification number: Y02T10/125 ,  Y02T10/128 ,  F02D41/402 ,  F02B19/14

Abstract: PURPOSE: An exhaust performance improvement method for a diesel engine using two-stage injection is provided to optimize the injection rate and enable application of HCCI(homogeneous charge compression ignition) combustion without a large modification of an engine. CONSTITUTION: An exhaust performance improvement method for a diesel engine using two-stage injection is as follows. First-stage injection is implemented to create pre-mixed gas at a crank angle of BDC(Bottom Dead Center) 60 degrees while maintaining low-temperature reaction in order to prevent the compressed air in a combustion chamber from reaching a diesel fuel ignition temperature of 750K before the completion of the injection. Second-stage injection is implemented after TDC(Top Dead Center). Accordingly, the compressed air temperature in the combustion chamber is reduced by the latent heat of vaporization generated in the first-stage injection and pre-mixing compression ignition is embodied through the ignition delay and injection delay of the second-stage injection.

Abstract translation: 目的：提供使用两级注射的柴油发动机的排气性能改进方法，以优化喷射速率，并且可以在不对发动机进行大修改的情况下应用HCCI（均质充气压缩点火）燃烧。 构成：使用两级注射的柴油发动机的排气性能改进方法如下。 实施第一阶段注入以在保持低温反应的同时在BDC（底死点）的曲柄角度下产生60度的预混合气体，以防止燃烧室中的压缩空气达到柴油燃料点火温度 750K之前注射完成。 TDC（Top Dead Center）后实施第二阶段注入。 因此，燃烧室中的压缩空气温度由于第一阶段喷射中产生的蒸发潜热而降低，并且通过第二阶段喷射的点火延迟和喷射延迟来实现预混合压缩点火。