In-cylinder pressure detecting device of direct injection type internal combustion engine
A direct-injection internal combustion engine and detection device technology, applied in fuel injection devices, special fuel injection devices, measuring devices, etc., can solve the problems of pressure detection accuracy reduction, piezoelectric element size reduction, and adverse effects of fuel flow, etc., to achieve Effects of suppressing overheating, expanding size, and improving pressure detection accuracy and durability
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no. 1 Embodiment approach
[0073] Such as figure 1 with figure 2 As shown, a cylinder head 12 is bonded to the upper surface of the cylinder block 11 of the direct fuel injection internal combustion engine, and a combustion chamber is formed between the upper surface of the piston 13 that is slidably fitted to the cylinder bore 11a and the lower surface of the cylinder head 12. 14. The two intake valve holes 12a, 12a connected to the intake port 15 and the two exhaust valve holes 12b, 12b connected to the exhaust port 16 open to the combustion chamber 14, and the two intake valve holes 12a, 12a are respectively The intake valves 17, 17 are opened and closed, and the two exhaust valve holes 12b, 12b are opened and closed by the exhaust valves 18, 18, respectively.
[0074] A spark plug 19 is mounted in a spark plug mounting hole 12 c formed in the center of the combustion chamber 14 . Further, a recessed portion 14a is formed at a position sandwiched between the two intake valve holes 12a, 12a of the...
no. 2 Embodiment approach
[0096] In the first embodiment, the pressure detection element 34 and the collar structure 35 are composed of separate members, whereas in the second embodiment, the pressure detection element 34 and the collar structure 35 are composed of a single member. According to this second embodiment, reduction in the number of components and simplification of the structure can be achieved.
[0097] Next, according to Figure 7 A third embodiment of the present invention will be described.
no. 3 Embodiment approach
[0099] In the first embodiment, the valve housing 31 and the collar structure 35 are composed of separate parts, but in the third embodiment, the collar structure 35 and the valve housing 31 are integrally formed. Therefore, the pressure detection element storage groove 31f formed on the outer surface of the valve housing 31 in the first embodiment is constituted by the tunnel-shaped output signal transmission member storage hole 31g in the third embodiment. The housing hole 31g penetrates through the inside of the valve housing 31 and the collar structure 35 which are integrally formed. According to the third embodiment, reduction in the number of components and simplification of the structure can be achieved.
[0100] Next, according to Figure 8 A fourth embodiment of the present invention will be described.
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