公开(公告)号：EP1835267A3

公开(公告)日：2010-12-01

申请号：EP07001343.8

申请日：2007-01-22

申请人： HITACHI, LTD.

发明人： Tokuyasu, Noboru ,  Terada, Daisuke ,  Kashio, Kaori ,  Otsuki, Toshiki ,  Fukatsu, Katsuaki ,  Onuki, Hiroshi ,  Kubo, Jun

IPC分类号： G01F1/684 ,  G01F1/69 ,  G01F1/698

CPC分类号： G01F1/6842 ,  G01F1/69 ,  G01F1/698

摘要： To realize a thermal gas-flow measuring instrument which can suppress the influence of pollution of a support of heating resistor on the output characteristics independent of the use environment. The first heating resistor (21) is placed in the gas to be measured. The temperature sensing resistor (24) which is positioned at upstream side or downstream side of the first heating resistor (21) generates signals relating to the flow rate. Between the first heating resistor (21) and the support (6) for supporting the first heating resistor (21), the second heating resistor (22) is positioned in a state of electrically insulated from the first heating resistor (21). The second heating resistor (22) suppresses the heat being transferred from the first heating resistor (21) to the support (2). The control circuit (31) controls the temperatures of the first heating resistor (21) and the second heating resistor (22) so as the operational temperature range of the second heating resistor (22) or the temperature range at the joint section between the first heating resistor (21) and the second heating resistor (22) to become at or above the temperature at which the water droplet evaporates to disappear by the film boiling.

公开(公告)号：EP1950406A2

公开(公告)日：2008-07-30

申请号：EP07024125.2

申请日：2007-12-12

申请人： Hitachi, Ltd.

发明人： Yamaoka, Shiro ,  Ohata, Eiichiro ,  Kubo, Jun ,  Tokuyasu, Noboru ,  Otsuki, Toshiki ,  Hoshika, Hiroaki

IPC分类号： F02M25/07

CPC分类号： F02D41/005 ,  F02B29/0406 ,  F02B2275/14 ,  F02D2041/0075 ,  F02M26/05 ,  F02M26/06 ,  F02M26/28 ,  F02M26/35 ,  F02M26/47 ,  F02M26/49 ,  Y02T10/47

摘要： The present invention relates to an exhaust gas recirculation system which prevents an EGR sensor installed in an engine's EGR path (9) from being soiled by soiling substances in exhaust. A catalyst (23, 24, 7) is positioned upstream of the EGR sensor (12) to purify the soiling substances in EGR gas. The status of the EGR sensor (12) is properly controlled in accordance with the conditions of the catalyst (23, 24, 7). This ensures the EGR sensor (12) is less likely to be affected by the soiling substances in the exhaust under any circumstances of the EGR path (9) and allows the EGR sensor (12) to avoid a decrease in the accuracy of EGR gas detection. An alternative configuration may be employed such that the EGR gas recirculates from the downstream side of a catalyst (7) installed in a main exhaust path.

摘要翻译： 本发明涉及一种废气再循环系统，其防止安装在发动机的EGR通路（9）中的EGR传感器被污染排气中的物质所污染。 催化剂（23,24,7）位于EGR传感器（12）的上游，以净化EGR气体中的污物。 根据催化剂（23,24,7）的条件适当地控制EGR传感器（12）的状态。 这确保了在EGR通路（9）的任何情况下，EGR传感器（12）不太可能受到废气中污染物质的影响，并允许EGR传感器（12）避免EGR气体检测精度的降低 。 可以采用替代配置，使得EGR气体从安装在主排气路径中的催化剂（7）的下游侧再循环。

公开(公告)号：EP1835267A2

公开(公告)日：2007-09-19

申请号：EP07001343.8

申请日：2007-01-22

申请人： HITACHI, LTD.

发明人： Tokuyasu, Noboru ,  Terada, Daisuke ,  Kashio, Kaori ,  Otsuki, Toshiki ,  Fukatsu, Katsuaki ,  Onuki, Hiroshi ,  Kubo, Jun

IPC分类号： G01F1/684 ,  G01F1/69 ,  G01F1/698

CPC分类号： G01F1/6842 ,  G01F1/69 ,  G01F1/698

摘要： To realize a thermal gas-flow measuring instrument which can suppress the influence of pollution of a support of heating resistor on the output characteristics independent of the use environment. The first heating resistor (21) is placed in the gas to be measured. The temperature sensing resistor (24) which is positioned at upstream side or downstream side of the first heating resistor (21) generates signals relating to the flow rate. Between the first heating resistor (21) and the support (6) for supporting the first heating resistor (21), the second heating resistor (22) is positioned in a state of electrically insulated from the first heating resistor (21). The second heating resistor (22) suppresses the heat being transferred from the first heating resistor (21) to the support (2). The control circuit (31) controls the temperatures of the first heating resistor (21) and the second heating resistor (22) so as the operational temperature range of the second heating resistor (22) or the temperature range at the joint section between the first heating resistor (21) and the second heating resistor (22) to become at or above the temperature at which the water droplet evaporates to disappear by the film boiling.

摘要翻译： 实现能够抑制加热电阻器的支撑体的污染对独立于使用环境的输出特性的热气流量测量仪器。 将第一加热电阻器（21）放置在要测量的气体中。 位于第一加热电阻器（21）的上游侧或下游侧的温度感测电阻器（24）产生与流量有关的信号。 在第一加热电阻器（21）和用于支撑第一加热电阻器（21）的支撑件（6）之间，第二加热电阻器（22）位于与第一加热电阻器（21）电绝缘的状态。 第二加热电阻器（22）抑制从第一加热电阻器（21）传递到支撑件（2）的热量。 控制电路（31）控制第一加热电阻器（21）和第二加热电阻器（22）的温度，以及第二加热电阻器（22）的工作温度范围或第一加热电阻器 加热电阻器（21）和第二加热电阻器（22）变成等于或高于水滴蒸发的温度以通过薄膜沸腾消失。