CN212410629U

CN212410629U - Engine rotating speed measuring device for NVH (noise, vibration and harshness) test of automobile

Info

Publication number: CN212410629U
Application number: CN202020958020.0U
Authority: CN
Inventors: 薛顺达; 吴华杰; 刘焕广
Original assignee: Sinetac Automobile Technology Shanghai Co ltd
Current assignee: Sinetac Automobile Technology Shanghai Co ltd
Priority date: 2020-05-31
Filing date: 2020-05-31
Publication date: 2021-01-26
Anticipated expiration: 2030-05-31

Abstract

The utility model discloses an engine speed measuring device for automobile NVH test, which comprises a patch cord, wherein the patch cord is connected with one end of a BNC shielding wire, and the other end of the BNC shielding wire is connected with an engine speed extraction wire; the engine speed extraction line comprises a grounding chuck, the grounding chuck is connected with a spiral wire, the spiral wire is connected with a contact pin, the contact pin is connected with a BNC line, and the BNC line is connected with a BNC male connector. The structure of the engine speed extraction line of the device is simple, and the cost is low; the engine rotating speed pulse signal can be extracted by inserting the contact pin into the signal wire of the engine spark plug, and the rotating speed is obtained. At present, no product for simply extracting the engine speed exists in the market.

Description

Engine rotating speed measuring device for NVH (noise, vibration and harshness) test of automobile

Technical Field

The utility model relates to a rotational speed measuring device technical field, concretely relates to engine speed measuring device for car NVH test.

Background

In the NVH test of the automobile, the working conditions of acceleration, deceleration, uniform speed, idling and the like are all the normal testing working conditions regardless of the problem of mapping test or real vehicle debugging. In the test process, the constant speed and the idle speed are steady-state processes, and the rotating speed of an engine does not need to be tracked generally; however, the acceleration and deceleration working conditions generally need to be externally connected with a device capable of measuring the rotating speed signal of the engine, so that the later-stage data processing is facilitated. At present, in NVH tests, a plurality of devices capable of measuring the rotating speed of an engine are provided, CAN lines, fields and the like are commonly used, and another method is to perform curve fitting according to noise or vibration signals of the engine to indirectly obtain the rotating speed of the engine.

The CAN line has the advantages that all information of the vehicle CAN be read, and signals including engine rotating speed, engine torque, accelerator opening, gear, vehicle speed, oil temperature, water temperature and the like are stable, but the DBC file of the vehicle type is obtained as a precondition. For the competitive vehicle, the host factory generally cannot obtain the DBC file of the vehicle type unless the vehicle type is developed by the host factory; the small field is used for measuring the signal of the ignition wire of the spark plug to obtain the rotating speed of the engine, and the device has simple structure and convenient use, but can only be used for measuring rotating speed signals. Meanwhile, in the test process, if the LMS front-end parameters are improperly set, the problems of unstable measurement signals, intermittent or even non-uniform measurement signals and the like can also occur; in addition, the engine speed signals of some competitive products vehicles cannot be acquired by using a small field and are possibly related to the characteristics of the vehicles; the method for indirectly acquiring the rotating speed of the engine by utilizing the noise or vibration signals of the engine to perform curve fitting is convenient, but the accuracy and the quality of a later data processing result are influenced, and the method is generally not preferred in testing. The three methods described above, while all capable of obtaining engine speed, may be limited by DBC files, vehicle characteristics, or other factors.

Disclosure of Invention

An object of the utility model is to provide an engine speed measuring device for car NVH test to solve the problem that provides in the above-mentioned background art. In order to achieve the above object, the utility model provides a following technical scheme: an engine rotating speed measuring device for automobile NVH testing comprises a patch cord, wherein the patch cord is connected with one end of a BNC shielding cord, and the other end of the BNC shielding cord is connected with an engine rotating speed extracting cord;

the engine speed extraction line comprises a grounding chuck, the grounding chuck is connected with a spiral wire, the spiral wire is connected with a contact pin, the contact pin is connected with a BNC line, and the BNC line is connected with a BNC male connector.

Preferably, the patch cord includes BNC line I, the public head of patch cord is connected to I one end of BNC line, and the public head I of BNC is connected to the other end.

Preferably, the BNC shielded wire includes BNC line II, the female head of BNC is connected to II one end of BNC line, and the female head I of BNC is connected to the other end, the public first I of BNC is connected to the female head of BNC, the public first of BNC is connected to the female first I of BNC.

Preferably, the spiral conducting wire and the BNC wire are connected to the same end of the contact pin, and the spiral conducting wire and the BNC wire are tied and fixed through a binding belt.

The utility model discloses a technological effect and advantage: the structure of the engine speed extraction line of the device is simple, and the cost is low; the engine rotating speed pulse signal can be extracted by inserting the contact pin into the signal wire of the engine spark plug, and the rotating speed is obtained. At present, no product for simply extracting the engine speed exists in the market.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of an engine speed extraction line structure according to the present invention;

fig. 3 is a schematic diagram of the BNC shielding line structure of the present invention;

fig. 4 is a schematic diagram of the patch cord structure of the present invention.

In the figure: the device comprises a 1-patch cord, a 2-BNC shielding cord, a 3-engine speed extraction cord, a 4-ribbon, a 11-BNC cord I, a 12-patch cord male head, a 13-BNC male head I, a 21-BNC cord II, a 22-BNC female head, a 23-BNC female head I, a 31-grounding chuck, a 32-spiral wire, a 33-contact pin, a 34-BNC cord and a 35-BNC male head.

Detailed Description

In order to make the technical means, the creative features, the objectives and the functions of the present invention easily understood and appreciated, the present invention will be further described with reference to the specific drawings, and in the description of the present invention, unless otherwise specified or limited, the terms "mounted," connected "and" connected "should be understood broadly, and for example, the terms" fixed connection, "detachable connection," integral connection, mechanical connection, and electrical connection may be used; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

Example 1

The engine speed measuring device for the NVH test of the automobile as shown in fig. 1 and fig. 2 comprises a patch cord 1, wherein the patch cord 1 is connected with one end of a BNC shielding cord 2, and the other end of the BNC shielding cord 2 is connected with an engine speed extraction cord 3;

the engine speed extraction line 3 comprises a grounding clamp 31, the grounding clamp 31 is connected with a spiral conductor 32, the spiral conductor 32 is connected with a pin 33, the pin 33 is connected with a BNC line 34, and the BNC line 34 is connected with a BNC male connector 35.

Example 2

The engine speed measuring device for the NVH test of the automobile as shown in fig. 1-4 comprises a patch cord 1, wherein the patch cord 1 is connected with one end of a BNC shielding cord 2, and the other end of the BNC shielding cord 2 is connected with an engine speed extraction cord 3;

Preferably, the patch cord 1 includes a BNC cord i 11, one end of the BNC cord i 11 is connected to the male plug 12 of the patch cord, and the other end is connected to the male plug i 13 of the BNC.

Preferably, the BNC shielded wire 2 includes a BNC wire ii 21, one end of the BNC wire ii 21 is connected to the BNC female connector 22, the other end is connected to the BNC female connector i 23, the BNC female connector 22 is connected to the BNC male connector i 13, and the BNC female connector i 23 is connected to the BNC male connector 35.

Preferably, the spiral conductor 32 and the BNC wire 34 are connected to the same end of the insertion pin 33, and the spiral conductor 32 and the BNC wire 34 are bound and fixed by the binding tape 4.

The utility model discloses process flow and theory of operation do: in practical use, the pin 33 of the engine speed extraction line 3 is inserted into an engine spark plug signal line, the grounding chuck 31 is grounded (only a vehicle body is connected), and the patch cord male head 12 is connected to the LMS data acquisition speed channel, so that an engine pulse signal can be obtained. Lab software (LMS test. Lab is vibration noise data acquisition and post-processing software developed by Siemens, and is the software applied most widely in NVH industry) is utilized to display the engine speed on a computer in real time, so that the processing of test data in the later period is facilitated, and the working efficiency is improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides an engine speed measuring device for car NVH test, includes the patch cord, its characterized in that: the adapter cable is connected with one end of the BNC shielding cable, and the other end of the BNC shielding cable is connected with the engine rotating speed extraction cable;

2. The engine speed measuring device for the NVH test of the automobile as claimed in claim 1, wherein: the patch cord includes BNC line I, I one end connection patch cord of BNC is public first, and the public first I of BNC is connected to the other end.

3. The engine speed measuring device for the NVH test of the automobile as claimed in claim 2, wherein: BNC shielded wire includes BNC line II, the female head of BNC is connected to II one ends of BNC line, and the female head I of BNC is connected to the other end, the public first I of BNC is connected to the female head of BNC, the public head of BNC is connected to the female first I of BNC.

4. An engine speed measuring device for NVH test of an automobile according to any one of claims 1 or 3, wherein: the spiral wire and the BNC wire are connected to the same end of the contact pin, and the spiral wire and the BNC wire are tied up and fixed through a binding belt.