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Air flow sensor equipped with flow channel

An air flow and sensor technology, which is applied in liquid/fluid solid measurement, instruments, measuring devices, etc., can solve problems such as reduced measurement accuracy, failure of detection components, and air flow disturbance, so as to improve measurement accuracy, reduce noise, and improve The effect of service life

Pending Publication Date: 2022-02-18
HITACHI AUTOMOTIVE SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) Although the design of the bypass can effectively divert gas and promote gas exchange, in the process of measuring air flow, the phenomenon of air flow turbulence inevitably occurs, which leads to a decrease in measurement accuracy
[0009] (2) Although the bypass has reduced the impurities or suspended matter floating in the air to a certain extent, some foreign matter will still adhere to the detection element, resulting in the risk of failure of the detection element

Method used

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  • Air flow sensor equipped with flow channel
  • Air flow sensor equipped with flow channel
  • Air flow sensor equipped with flow channel

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0061] figure 2 is a schematic diagram of the air flow sensor 10 according to the first embodiment of the present invention, image 3 shows the air in figure 2 The direction of flow in the flow channel 12 of the air flow sensor 10 is shown.

[0062] Such as figure 2 As shown, the air flow sensor is mainly composed of a housing 11, a front cover 16, a rear cover 17 and a flow channel 12, wherein the flow channel 12 is opened in the housing 11 for air to flow through it, and the front cover 16 is installed on the front of the housing 11. On the side, the rear cover 17 is mounted on the rear side of the housing 11, and the front cover 16 and the rear cover 17 sandwich the substrate 20 carried on the housing 11 therebetween.

[0063]It should be noted here that the terms used in the description of the present application, such as "front side", "rear side", etc., are determined based on the positional relationship shown in the drawings. However, such limitations do not imply...

no. 2 example

[0077] Figure 4 is a schematic diagram of an air flow sensor according to a second embodiment of the present invention, Figure 5 shows the air in Figure 4 Direction of flow in the flow path of the air flow sensor shown. Compared with the first embodiment, the second embodiment is different in that the substantially S-shaped flow passage is replaced by a substantially C-shaped flow passage that is substantially vertically symmetrical. For the sake of brevity, this embodiment only describes the different parts, and omits the description of the same parts.

[0078] Such as Figure 4 As shown, the air inlet is arranged on one side of the casing, that is, the first side, and the air outlet is arranged on the same side of the casing, that is, the first side is near the bottom side of the casing. In this embodiment, both the air inlet and the air outlet are arranged on the first side of the housing near the front side of the housing or the front cover. Of course, both the air...

no. 3 example

[0083] Figure 6 is a schematic diagram of an air flow sensor according to a third embodiment of the present invention, Figure 7 shows the air in Figure 6 Direction of flow in the flow path of the air flow sensor shown. Compared with the first embodiment, the difference of the third embodiment is that the substantially S-shaped flow channel is replaced by a substantially α-shaped flow channel that is substantially bilaterally symmetrical. For the sake of brevity, this embodiment only describes the different parts, and omits the description of the same parts.

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Abstract

The invention relates to an air flow sensor (10) which comprises a shell (11), and a flow channel (12) which is arranged in the shell (11) and allows air to flow through, wherein the flow channel (12) comprises an air inlet (13), an air outlet (14), and a detection element (15) arranged between the air inlet (13) and the air outlet (14). The flow channel (12) is provided with at least one turning section (18a, 18b) at the upstream of the detection element (15), and the turning sections (18a, 18b) are each provided with a foreign matter discharge opening (19a, 19b) from which foreign matter in the air is discharged. According to the air flow sensor, the air flowing through the flow channel can be stabilized, and the risk that foreign matter in the air is attached to the detection element can be reduced.

Description

technical field [0001] The present invention relates to an air flow sensor, and more particularly, to an air flow sensor equipped with a flow channel. Background technique [0002] The air flow sensor, also known as the air flow meter, is one of the important sensors of the EFI engine. The air flow sensor is used to measure the air flow sucked into the engine, and convert the measured air flow value into an electrical signal and send it to the electronic control unit (ECU). This electrical signal is one of the basic signals to determine fuel injection. If the air flow sensor or its circuit breaks down, the ECU will not get the correct signal of the intake air volume, and cannot normally control the fuel injection volume, which will cause the mixture to be too rich or too lean, resulting in abnormal engine operation. [0003] In the actual application process, the intrusion of foreign matter is one of the main reasons for the failure of the air flow sensor or its circuit. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/10G01F15/12G01F15/10
CPCG01M15/102G01F15/12G01F15/10
Inventor 陆志悦
Owner HITACHI AUTOMOTIVE SYST SUZHOU