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Knock sensor for combustion motor

A knock sensor, internal combustion engine technology, applied in the direction of instruments, measuring devices, measuring rapid changes, etc., to achieve the effect of increasing the contact area, reducing deviation, and reducing deviation

Active Publication Date: 2012-10-17
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, if Figure 13 As shown, since the closer the input frequency is to the resonant frequency, the larger the output signal will be. Therefore, if there is a deviation in the resonant frequency, the deviation of the output signal in the frequency band close to the resonant frequency will become larger.

Method used

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  • Knock sensor for combustion motor
  • Knock sensor for combustion motor
  • Knock sensor for combustion motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0060] figure 1 It is a cross-sectional view showing the internal structure of knock sensor 1 for an internal combustion engine according to Embodiment 1 of the present invention. exist figure 1 Among them, 1 represents a knock sensor covered with a housing 13 made of synthetic resin (such as nylon 66) for all structural parts, and a connector for connecting a connector from an ignition timing control device (not shown) is formed on the housing 13. Connecting portion 13a. 2 represents the metal base of the knock sensor 1, including a disc-shaped flange portion 2a, and a cylindrical portion 2b extending axially from the flange portion 2a, and has a hole penetrating through both the flange portion 2a and the cylindrical portion 2b. In the through hole 2c, a groove portion 2d around the outer peripheral surface is formed at the front end portion of the cylindrical portion 2b. In addition, an attachment portion surface 2e for attachment to the internal combustion engine is fo...

Embodiment approach 2

[0084] Next, use Figure 5 and Figure 6 Embodiment 2 of the present invention will be described.

[0085] Figure 5 is a cross-sectional view showing knock sensor 30 according to Embodiment 2 of the present invention, Figure 6 yes means Figure 5 Enlarged view of the internal combustion engine mounting surface of the metal base.

[0086] exist Figure 5 , Figure 6 Among them, the knock sensor for an internal combustion engine according to the second embodiment of the present invention is substantially the same as that of the above-mentioned first embodiment, but with respect to the internal combustion engine mounting surface 2e formed on the flange portion 2a of the metal base 2, the mounting surface of the metal base 2 A taper 2f is formed from the outer periphery of 2e toward the inner periphery in a direction opposite to the mounting surface on the engine side. Moreover, the surface treatment 3 whose Vickers hardness is Hv20 or less is given to the surface of the ...

Embodiment approach 3

[0090] Next, based on Figure 8 , Figure 9 Embodiment 3, which is a knock sensor different in shape from Embodiments 1 and 2, will be described.

[0091] Figure 8 is a cross-sectional view showing a knock sensor 40 for an internal combustion engine according to Embodiment 3 of the present invention, Figure 9 is its top view. exist Figure 8 , Figure 9 Among them, 16 represents the metal casing of the knock sensor 40, which includes an annular flange portion 16a and a cylindrical portion 16b extending axially from the flange portion 16a, and forms a cup by the flange portion 16a and the cylindrical portion 16b. shape.

[0092] An external thread 16c for screwing and fixing to an internal combustion engine is formed on the flange portion 16a. A hexagonal portion for easy tightening and fixing to the internal combustion engine with a tool such as a wrench (not shown) is formed on the cylindrical portion 16b. In addition, the flange portion 16a is formed by machining o...

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Abstract

The invention discloses a knock sensor for a combustion motor, being able to increase the contact area between the combustion mounting surface of the knock sensor and the cylinder mounting surface of the combustion motor so as to detect the knock sensor with wider vibration frequency range. The knock sensor is a non resonant knock sensor, comprising a metal substrate (2), a piezo electric element (4) and a maintaiing member (10), wherein the metal substrate (2) is provided with a lug part (2a), a drum part (2b) which extends axially from the lug part, and a mounting surface (2e) which is formed in the lug part and is propped to the vibration of the combustion motor; the piezo electric element (4) is arranged in the drum part (2b) and converts the knock vibration of the vibration occuring part into electric signal for detection; and the maintaiing member (10) presses and maintains the piezo electric element (4) at the lug part (2a), and performs surface processing (3) of Vickers hardness of less than Hv20 for the surface of the metal substrate (2) containing at least the mounting surface (2e).

Description

technical field [0001] The present invention relates to a knock sensor for a non-resonant internal combustion engine. Background technique [0002] The knock sensor is a vibration sensor that detects the knock state of the internal combustion engine. It is mainly installed on the cylinder block of the internal combustion engine and converts the knock vibration generated in the combustion chamber into an electrical signal. The engine control unit (hereinafter referred to as ECU) performs knock judgment and ignition timing control based on the output signal of the knock sensor. [0003] The natural frequency of vibration due to knocking is given by the well-known following Draper formula (1). [0004] [mathematical formula 1] [0005] F = C πB · ρmn ····Formula 1) [0006] In the formula, F: resonance frequency [0007] C: The speed of sound in a burning atmosphere [0008] B: cylinder b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L23/22
Inventor 横井章人
Owner MITSUBISHI ELECTRIC CORP