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1. 发明申请

WO1991000987A1 AIR-FLOW METER 审中-公开
标题翻译：空气流量计
公开(公告)号：WO1991000987A1
公开(公告)日：1991-01-24
申请号：PCT/DE1990000439
申请日：1990-06-08
申请人： ROBERT BOSCH GMBH , PETERS, Klaus-Jürgen , BOSCH, Walter , STIEFEL, Hans-Peter , GMELIN, Karl , FRANK, Kurt , SCHWEGEL, Thomas
发明人： ROBERT BOSCH GMBH
IPC分类号： G01F01/68
CPC分类号： G01F1/6842 , F02D41/187 , G01F5/00
摘要： The invention concerns an air-flow meter, in particular one for measuring the flow of air aspirated by an internal-combustion engine. The flow meter has a main flow channel (11) with a Venturi section (24), and a temperature-dependent measurement resistance (26) located in a bypass channel (12), the bypass channel (12) opening out into the main channel upstream and downstream of the point of minimum flow cross-section (25) of the Venturi section (24). In order to reduce the noise level in the measurement signal (26) due to the measurement resistance, a section (30) of the bypass channel (12) is designed with inlet and outlet openings (34, 35), the central region (31) of this part of the channel accommodating the measurement resistance (26). This section (30) of the channel is designed so that the ratio of the flow cross-section of the central region (31) to the minimum cross-section (25) of the Venturi section (24) is from 1:8 to 1:25 and the ratio of the flow-section of the central region (31) to the cross-section of the inlet and outlet openings (34, 35) is from 1:1 to 1:2.
摘要翻译：本发明涉及一种空气流量计，特别是用于测量由内燃机吸入的空气流量的气流计。该流量计具有一个具有文氏管部分（24）的主要流动通道（11）和位于旁路通道（12）中的温度依赖测量电阻（26），旁通通道（12）打开进入主通道文丘里部分（24）的最小流动横截面（25）点的上游和下游。为了降低由于测量电阻引起的测量信号（26）中的噪声水平，旁路通道（12）的部分（30）设计有入口和出口（34,35），中心区域（31））容纳测量电阻（26）的通道的该部分。该通道的该部分（30）设计成使得文丘里部分（24）的中心区域（31）的流动横截面与最小横截面（25）的比率为1:8至1 ：25，并且中心区域（31）的流动部分与入口和出口（34,35）的横截面之比为1:1至1:2。

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