Multi-channel real-time cylinder pressure acquisition equipment

Abstract

The utility model discloses multi-channel real-time cylinder pressure acquisition equipment, which comprises a multi-channel integrated power supply acquisition unit, an oscilloscope and a plurality of cylinder pressure acquisition pipes, and is characterized in that the multi-channel integrated power supply acquisition unit comprises a shell and a power supply module, and the power supply module is connected with a plurality of input connectors in parallel; the positive end, close to the power module, of the power supply loop is provided with a master control switch, the input connector is arranged on one side of the shell, the other side of the shell is provided with a plurality of output connectors, and each input connector is provided with a power supply end electrically connected with the power module and an electric signal output end electrically connected with the output connector. Each power supply end is connected with the power-on interface of the corresponding cylinder pressure acquisition tube, each electric signal output end is connected with the signal output interface of the cylinder pressure acquisition tube, and the input interface of each oscilloscope is connected with the corresponding output connector through a signal wire harness. According to the multi-channel real-time cylinder pressure acquisition equipment, power supply and acquisition are integrated, and multi-channel simultaneous power supply and signal output are realized.

Description

Technical Field

[0001] This utility model relates to the field of engine cylinder pressure detection, specifically to a multi-channel real-time cylinder pressure acquisition device. Background Technology

[0002] Cylinder pressure testing accurately assesses engine performance by measuring the pressure in each cylinder during the compression stroke, revealing cylinder sealing performance, combustion efficiency, and the condition of related mechanical components. Cylinder pressure testing is a crucial method for diagnosing engine faults. By comparing the cylinder pressure values ​​of each cylinder, cylinders with abnormal pressure can be identified, indicating potential mechanical damage or other problems, such as poor valve sealing, piston ring wear, cylinder wall wear, or carbon buildup. Analyzing cylinder pressure data allows for optimization of engine design, improving combustion efficiency and power performance. Furthermore, cylinder pressure testing provides critical data that enables engineers to adjust parameters such as ignition timing and fuel injection based on actual cylinder pressure conditions, thereby improving combustion efficiency and power output while reducing fuel consumption and emissions.

[0003] Publication number CN214149672U discloses an automotive engine cylinder pressure detection sensor. This sensor includes a valve seat, a housing, a pressure sensor, and the valve seat and housing are detachably connected. A three-way valve is located inside the valve seat; one end of the three-way valve is connected to the pressure sensor; the other end of the three-way valve is connected to a connecting pipe, and the pressure sensor is connected to a pipe on the engine cylinder being tested via the connecting pipe; the third end of the three-way valve is connected to a discharge valve needle, which is threaded to a discharge valve set screw connector; a bracket is located outside the valve seat, and a USB connector is mounted on the bracket. The pressure sensor is connected to the USB connector via a wire. This automotive engine cylinder pressure detection sensor is directly connected to an AD amplifier module, but it can only detect the cylinder pressure of one cylinder at a time, resulting in the inability to simultaneously detect the cylinder pressure of multiple cylinders. Utility Model Content

[0004] The purpose of this invention is to provide a multi-channel real-time cylinder pressure acquisition device. This device integrates power supply and acquisition, enabling simultaneous power supply and signal output for multiple channels, thereby achieving synchronous detection of cylinder pressure in multiple cylinders of an engine and improving the accuracy of the detection data.

[0005] To achieve the above objectives, this utility model provides a multi-channel real-time cylinder pressure acquisition device. This device includes a multi-channel integrated power supply acquisition unit, an oscilloscope, and multiple cylinder pressure acquisition tubes. The multi-channel integrated power supply acquisition unit includes a housing and a power module disposed within the housing. The power module has multiple input connectors connected in parallel. The power module and the multiple input connectors form a power supply circuit. A master control switch is disposed near the positive terminal of the power module in the power supply circuit. The input connectors are disposed on one side of the housing, and multiple output connectors are disposed on the other side of the housing. Each input connector has a power supply terminal electrically connected to the power module and an electrical signal output terminal electrically connected to the output connector. The input connectors and output connectors form a signal circuit. Each power supply terminal is connected to the power interface of the corresponding cylinder pressure acquisition tube, and each electrical signal output terminal is connected to the signal output interface of the cylinder pressure acquisition tube. Each input interface of the oscilloscope is connected to the corresponding output connector via a signal harness.

[0006] Preferably, the power module is a rechargeable battery, and the rechargeable battery is connected in parallel with a charging interface and a charging indicator light. The charging interface and the charging indicator light are both located on the side of the housing. The rechargeable battery, the charging interface, and the charging indicator light together form a charging circuit. A diode that allows charging current to pass through is provided near the positive terminal of the rechargeable battery in the charging circuit. A charging cable is inserted into the charging interface.

[0007] Preferably, the cylinder pressure acquisition tube includes a tube body that can be inserted into the cylinder, a pressure sensor connected to the outer end of the tube body, and an integrated wiring harness connected to the outer end of the pressure sensor, the outer end of the integrated wiring harness being plugged into the input connector.

[0008] Preferably, the wire electrically connected to the negative terminal of the rechargeable battery has a negative terminal electrically connected to the outer casing, and the negative terminals of the output connector and the charging interface are both electrically connected to the negative terminal through the outer casing.

[0009] Preferably, the power supply terminal includes a first pin electrically connected to the positive terminal of the power module and a second pin electrically connected to the negative terminal of the power module, and the power interface of the cylinder pressure acquisition tube includes a first socket that can be inserted into the first pin and a second socket that can be inserted into the second pin.

[0010] Preferably, the electrical signal output terminal includes a third pin electrically connected to the negative terminal of the power module and a fourth pin electrically connected to the positive terminal of the output connector. The signal output interface of the cylinder pressure acquisition tube includes a third socket that can be inserted into the third pin and a fourth socket that can be inserted into the fourth pin.

[0011] Preferably, the third pin extends from the inner end of the second pin.

[0012] Preferably, the first pin, the second pin, the third pin, and the fourth pin are arranged in a line or in a matrix.

[0013] Preferably, the oscilloscope is provided with an oscilloscope output harness, and the end of the oscilloscope output harness is provided with a plug that can be plugged into a terminal display device.

[0014] According to the above technical solution, this utility model provides a multi-channel real-time cylinder pressure acquisition device, including a multi-channel integrated power supply acquisition unit, an oscilloscope, and multiple cylinder pressure acquisition tubes. The multi-channel integrated power supply acquisition unit includes a housing and a power module disposed within the housing. The power module is connected in parallel with multiple input connectors. The power module and the multiple input connectors are combined to form a power supply circuit. A master control switch is disposed near the positive terminal of the power module in the power supply circuit. The input connectors are disposed on one side of the housing, and multiple output connectors are disposed on the other side of the housing. Each input connector is provided with a power supply terminal electrically connected to the power module and an electrical signal output terminal electrically connected to the output connector. The input connectors and output connectors are combined to form a signal circuit. Each power supply terminal is connected to the power interface of the corresponding cylinder pressure acquisition tube, and each electrical signal output terminal is connected to the signal output interface of the cylinder pressure acquisition tube. The input interface of each oscilloscope is connected to the corresponding output connector through a signal harness.

[0015] This multi-channel real-time cylinder pressure acquisition device has the following advantages: 1. By connecting the input connectors in parallel with the power module, and electrically connecting the power module to the power supply terminal of each input connector, synchronous power supply to multiple input connectors is achieved, thereby synchronously powering the cylinder pressure acquisition tubes connected to the input connectors; 2. The output current of the cylinder pressure acquisition tubes connected to the input connectors is output to the output connectors after passing through the electrical signal output terminal. Each input connector corresponds to one output connector, enabling the multi-channel integrated power supply acquisition unit to simultaneously connect multiple cylinder pressure acquisition tubes to detect the cylinder pressure in different cylinders, improving the accuracy of cylinder pressure detection. The acquired cylinder pressure data is then transmitted to an oscilloscope and finally displayed on the terminal display device as a waveform signal; 3. The multi-channel integrated power supply acquisition unit in this solution integrates power supply and acquisition into one unit, realizing simultaneous power supply and signal output for multiple channels, thereby achieving synchronous cylinder pressure detection of multiple cylinders in the engine. This avoids data errors caused by different cylinder environments during batch testing, improving the accuracy of the detection data.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a structural diagram of a preferred embodiment of a multi-channel real-time cylinder pressure acquisition device;

[0019] Figure 2 This is a structural diagram of a preferred embodiment of a multi-channel integrated power supply and acquisition unit.

[0020] Explanation of reference numerals in the attached figures

[0021] 1-Multi-channel integrated power supply and acquisition unit; 2-Integrated wiring harness; 3-Tube body; 4-Oscilloscope; 5-Signal wiring harness; 6-Oscilloscope output wiring harness; 7-Plug; 8-Charging wiring harness; 9-Pressure sensor; 11-Housing shell; 12-Rechargeable battery; 13-Master control switch; 14-Charging indicator light; 15-Charging interface; 16-Output connector; 17-Input connector; 18-Power supply circuit; 19-Charging circuit; 110-Signal circuit; 111-First pin; 112-Second pin; 113-Third pin; 114-Fourth pin; 115-Diode; 116-Negative terminal. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0024] See Figure 1-2The multi-channel real-time cylinder pressure acquisition device shown includes a multi-channel integrated power supply acquisition unit 1, an oscilloscope 4, and multiple cylinder pressure acquisition tubes. The multi-channel integrated power supply acquisition unit 1 includes a housing 11 and a power module disposed within the housing 11. The power module is connected in parallel to multiple input connectors 17. The power module and the multiple input connectors 17 are combined to form a power supply circuit 18. A master control switch 13 is disposed near the positive terminal of the power module in the power supply circuit 18. The input connectors 17 are disposed on one side of the housing 11. On the other side of the housing 11, a plurality of output connectors 16 are provided. Each input connector 17 is provided with a power supply terminal electrically connected to the power module and an electrical signal output terminal electrically connected to the output connector 16. The input connectors 17 and the output connectors 16 are combined to form a signal circuit 110. Each power supply terminal is connected to the power interface of the corresponding cylinder pressure acquisition tube, and each electrical signal output terminal is connected to the signal output interface of the cylinder pressure acquisition tube. Each input interface of the oscilloscope 4 is connected to the corresponding output connector 16 through a signal harness 5.

[0025] Through the implementation of the above technical solution, firstly, by connecting the input connector 17 in parallel with the power module, and electrically connecting the power module to the power supply terminal of each input connector 17, synchronous power supply to multiple input connectors 17 is achieved, thereby synchronously powering the cylinder pressure acquisition tubes connected to the input connectors 17; secondly, the output current of the cylinder pressure acquisition tubes connected to the input connectors 17 is output to the output connector 16 after passing through the electrical signal output terminal, and each input connector 17 corresponds one-to-one with an output connector 16, enabling the multi-channel integrated power supply acquisition unit 1 to simultaneously connect multiple cylinder pressure acquisition tubes to detect the cylinder pressure in different cylinders, improving the accuracy of cylinder pressure detection, and transmitting the collected cylinder pressure data to the oscilloscope 4, and finally displaying it on the terminal display device through waveform signals; thirdly, the multi-channel integrated power supply acquisition unit 1 in this solution integrates power supply and acquisition into one, realizing simultaneous power supply and signal output of multiple channels, thereby realizing synchronous detection of cylinder pressure in multiple cylinders of the engine, avoiding data errors caused by different cylinder environments during batch testing, and improving the accuracy of detection data.

[0026] In this embodiment, the power module is a rechargeable battery 12. The rechargeable battery 12 is connected in parallel to a charging interface 15 and a charging indicator light 14. Both the charging interface 15 and the charging indicator light 14 are located on the side of the housing 11. The rechargeable battery 12, the charging interface 15, and the charging indicator light 14 together form a charging circuit 19. A diode 115, allowing charging current to pass through, is located near the positive terminal of the rechargeable battery 12 in the charging circuit 19. A charging cable 8 is inserted into the charging interface 15. With this implementation, when the charging interface 15 is plugged into the charging cable 8 and energized, the rechargeable battery 12 can be charged. During charging, the charging indicator light 14 illuminates. When not charging, due to the diode 115, the rechargeable battery 12 cannot supply power to the charging indicator light 14, therefore, the charging indicator light 14 does not illuminate.

[0027] In this embodiment, to further provide a cylinder pressure acquisition tube, the cylinder pressure acquisition tube includes a tube body 3 that can be inserted into the cylinder, a pressure sensor 9 connected to the outer end of the tube body 3, and an integrated wiring harness 2 connected to the outer end of the pressure sensor 9. The outer end of the integrated wiring harness 2 is plugged into the input connector 17. One end of the tube body 3 is configured to be inserted into the cylinder port and close the cylinder port. During detection, the pressure inside the engine cylinder can apply pressure to the detection end of the pressure sensor 9 through the tube body 3. This pressure is the detected cylinder pressure value. The pressure sensor 9 converts the detected cylinder pressure into an electrical signal, which passes sequentially through the integrated wiring harness 2, the input connector 17, the signal circuit 110, the output connector 16, the signal wiring harness 5, the oscilloscope 4, the oscilloscope output wiring harness 6, and the plug 7, and is then displayed as a waveform signal on the terminal display device. The tube body 3 can be a rigid metal tube or a heat-insulated flexible tube, depending on the need.

[0028] The specific method for inserting the tube body 3 into the cylinder block is as follows: insert the outer end of the tube body 3 into the spark plug thread hole or use a special connector to install it in the thread hole of the fuel injector or preheating plug, so that the tube body 3 is connected to the combustion chamber part inside the cylinder, so as to test the pressure change of each stroke in the cylinder and the corresponding time of the pressure change for data collection as a basis for fault diagnosis.

[0029] In this embodiment, the wire electrically connected to the negative terminal of the rechargeable battery 12 is provided with a negative terminal 116 electrically connected to the housing 11. The negative terminals of the output connector 16 and the charging interface 15 are both electrically connected to the negative terminal 116 through the housing 11. With this arrangement, the negative terminals of the output connector 16 and the charging interface 15 are both electrically connected to the negative terminal 116 through the housing 11, and thus connected to the negative terminal of the rechargeable battery 12, enabling the charging circuit 19 and the signal circuit 110 to function normally. In addition, it also grounds the housing 11, improving safety during use.

[0030] In this embodiment, the power supply terminal includes a first pin 111 electrically connected to the positive terminal of the power module and a second pin 112 electrically connected to the negative terminal of the power module. The power interface of the cylinder pressure acquisition tube includes a first socket for inserting the first pin 111 and a second socket for inserting the second pin 112. With this configuration, the first pin 111 is connected to the positive terminal of the power interface (i.e., the first pin 111 is inserted into the conductive first socket), and the second pin 112 is connected to the negative terminal of the power interface (i.e., the second pin 112 is inserted into the conductive second socket), thereby powering the pressure sensor 9.

[0031] In this embodiment, the electrical signal output terminal includes a third pin 113 electrically connected to the negative terminal of the power module, and a fourth pin 114 electrically connected to the positive terminal of the output connector 16. The signal output interface of the cylinder pressure acquisition tube includes a third socket for inserting into the third pin 113 and a fourth socket for inserting into the fourth pin 114. The positive terminal of the pressure sensor 9 is connected to the fourth pin 114, and the negative terminal of the pressure sensor 9 is connected to the third pin 113. The third and fourth sockets serve as electrodes and are respectively engaged with the third pin 113 and the fourth pin 114, enabling the pressure sensor 9 to convert the pressure signal within the cylinder into an electrical signal output and transmit it to the output connector 16.

[0032] In this embodiment, the third pin 113 extends from the inner end of the second pin 112. This arrangement allows the third pin 113 to be connected to the same negative terminal line as the second pin 112.

[0033] In this embodiment, to further provide an arrangement of the first pin 111, the second pin 112, the third pin 113, and the fourth pin 114, the first pin 111, the second pin 112, the third pin 113, and the fourth pin 114 are arranged in a line or in a matrix. The interface of the input connector 17 can be rectangular or circular.

[0034] In this embodiment, to further provide an oscilloscope 4, the oscilloscope 4 is provided with an oscilloscope output harness 6, and the end of the oscilloscope output harness 6 is provided with a plug 7 that can be plugged into a terminal display device. The oscilloscope 4 can be 4-channel, 8-channel, 12-channel, or 16-channel, corresponding to the number of cylinder pressure acquisition tubes, input connectors 17, and output connectors 16, and can simultaneously acquire the cylinder pressure of 6, 8, 12, or 16 cylinders. The measured cylinder pressure is used as a parameter as a basis for fault diagnosis.

[0035] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0036] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0037] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A multi-channel real-time cylinder pressure acquisition device, characterized in that, The multi-channel real-time cylinder pressure acquisition device includes a multi-channel integrated power supply acquisition unit (1), an oscilloscope (4), and multiple cylinder pressure acquisition tubes. The multi-channel integrated power supply acquisition unit (1) includes a housing (11) and a power module disposed within the housing (11). The power module is connected in parallel with multiple input connectors (17). The power module and the multiple input connectors (17) are combined to form a power supply circuit (18). A master control switch (13) is disposed near the positive terminal of the power module in the power supply circuit (18). The input connectors (17) are disposed on one side of the housing (11). On the other side of 11), there are multiple output connectors (16). Each input connector (17) is provided with a power supply terminal electrically connected to the power module and an electrical signal output terminal electrically connected to the output connector (16). The input connector (17) and the output connector (16) are combined to form a signal circuit (110). Each power supply terminal is connected to the power-on interface of the corresponding cylinder pressure acquisition tube. Each electrical signal output terminal is connected to the signal output interface of the cylinder pressure acquisition tube. The input interface of each oscilloscope (4) is connected to the corresponding output connector (16) through a signal harness (5).

2. The multi-channel real-time cylinder pressure acquisition device according to claim 1, characterized in that, The power module is a rechargeable battery (12). The rechargeable battery (12) is connected in parallel with a charging interface (15) and a charging indicator light (14). The charging interface (15) and the charging indicator light (14) are both located on the side of the housing (11). The rechargeable battery (12), the charging interface (15) and the charging indicator light (14) are combined to form a charging circuit (19). A diode (115) that allows charging current to pass through is provided near the positive terminal of the rechargeable battery (12) in the charging circuit (19). A charging wire harness (8) is inserted into the charging interface (15).

3. The multi-channel real-time cylinder pressure acquisition device according to claim 1, characterized in that, The cylinder pressure acquisition tube includes a tube body (3) that can be inserted into the cylinder, a pressure sensor (9) connected to the outer end of the tube body (3), and an integrated wire harness (2) connected to the outer end of the pressure sensor (9). The outer end of the integrated wire harness (2) is plugged into the input connector (17).

4. The multi-channel real-time cylinder pressure acquisition device according to claim 2, characterized in that, The wire electrically connected to the negative terminal of the rechargeable battery (12) is provided with a negative terminal (116) electrically connected to the outer casing (11). The negative terminals of the output connector (16) and the charging interface (15) are both electrically connected to the negative terminal (116) through the outer casing (11).

5. The multi-channel real-time cylinder pressure acquisition device according to claim 1, characterized in that, The power supply terminal includes a first pin (111) electrically connected to the positive terminal of the power module and a second pin (112) electrically connected to the negative terminal of the power module. The power interface of the cylinder pressure acquisition tube includes a first socket that can be inserted into the first pin (111) and a second socket that can be inserted into the second pin (112).

6. The multi-channel real-time cylinder pressure acquisition device according to claim 5, characterized in that, The electrical signal output terminal includes a third pin (113) electrically connected to the negative terminal of the power module, and a fourth pin (114) electrically connected to the positive terminal of the output connector (16). The signal output interface of the cylinder pressure acquisition tube includes a third socket that can be inserted into the third pin (113), and a fourth socket that can be inserted into the fourth pin (114).

7. The multi-channel real-time cylinder pressure acquisition device according to claim 6, characterized in that, The third pin (113) is led out from the inner end of the second pin (112).

8. The multi-channel real-time cylinder pressure acquisition device according to claim 5, characterized in that, The first pin (111), the second pin (112), the third pin (113) and the fourth pin (114) are arranged in a line or in a matrix.

9. The multi-channel real-time cylinder pressure acquisition device according to claim 1, characterized in that, The oscilloscope (4) is provided with an oscilloscope output harness (6), and the end of the oscilloscope output harness (6) is provided with a plug (7) that can be plugged into a terminal display device.

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