Fully automatic NVH bench test method based on characteristic signals

Abstract

The present invention relates to the technical field of NVH testing for new energy vehicle powertrains, and discloses a fully automated NVH bench test method based on characteristic signals. A bench is connected to NVH testing equipment. The bench obtains its own bench status signal and a characteristic signal generated by the bench for controlling the NVH testing equipment switch, and transmits the signal to the NVH testing equipment. The NVH testing equipment collects data based on the received characteristic signal and records the bench status signal. The fully automated NVH bench test method based on characteristic signals of the present invention improves testing efficiency and reduces the risk of human operation.

Description

Technical Field

[0001] The present invention relates to the technical field of NVH testing of new energy vehicle powertrains, and in particular to a fully automatic NVH bench testing method based on characteristic signals. Background Art

[0002] With the development of new energy vehicles and the improvement of people's living standards, the performance requirements for NVH of new energy electric drive assemblies are getting higher and higher, and the updates are getting faster and faster. This requires us to develop faster and more efficiently, and require lower and lower fault tolerance risks.

[0003] In the existing NVH test bench process, after the test bench engineer has brought the electric drive assembly to the test condition, the NVH engineer is required to manually operate the equipment to determine the start and end points. After each condition is completed, the above steps are repeated, resulting in the following problems:

[0004] 1. Since the NVH single-condition test time is relatively short, more time is spent on adjusting the electric drive to the test condition and personnel confirming whether the test condition has been achieved, which seriously affects the NVH test efficiency;

[0005] 2. Risk of human error due to human involvement;

[0006] 3. The existing test method has the risk of failing to promptly detect invalid data after test bench parameter anomalies because NVH equipment cannot read test bench signals.

[0007] 4. Since the bench data cannot be read and saved synchronously, there is a risk that the bench data will need to be retrieved for later analysis without any records;

[0008] 5. The key sensor data added to the test bench (such as electric drive oil temperature, etc.) cannot be collected by the NVH equipment. Summary of the Invention

[0009] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a fully automatic NVH bench test method based on characteristic signals, which improves test efficiency and reduces the risk of human operation.

[0010] To achieve the above-mentioned purpose, the present invention designs a fully automatic NVH bench test method based on characteristic signals. The bench is connected to the NVH test equipment. The bench obtains the bench status signal of the bench itself and the characteristic signal generated by the bench for controlling the switch of the NVH test equipment, and sends them to the NVH test equipment. The NVH test equipment performs data acquisition according to the received characteristic signal and records the bench status signal.

[0011] Preferably, the characteristic signal is 1&0. When the characteristic signal received by the NVH testing device changes from 0 to 1, the NVH testing device starts data collection. When the characteristic signal received by the NVH testing device changes from 1 to 0, the NVH testing device stops data collection.

[0012] Preferably, after completing one data collection, the NVH test equipment enters the collection preparation work for the next working condition and monitors the characteristic signal.

[0013] Preferably, the test working conditions of the test bench are divided into acceleration working conditions, coasting working conditions and uniform speed working conditions, and characteristic signals are adapted in each working condition.

[0014] Preferably, the test bench is connected to an electric drive, and the test bench obtains an electric drive status signal of the electric drive and sends it to the NVH test equipment for recording by the NVH test equipment.

[0015] Preferably, the test bench sends a working condition control signal to the electric drive while sending a characteristic signal to the NVH testing equipment.

[0016] Preferably, several other scattered sensors are also included, and the test bench obtains scattered sensor signals of the scattered sensors and sends them to the NVH testing equipment for recording by the NVH testing equipment.

[0017] Preferably, the scattered sensors include an oil temperature sensor provided on the electric drive.

[0018] Preferably, the test bench status signal includes a speed signal, a torque signal and a temperature signal of the test bench.

[0019] Preferably, the NVH testing device is provided with an NVH sensor, and when the NVH testing device collects data, the NVH sensor signal of the NVH sensor is simultaneously recorded.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The characteristic signals enable perfect interaction and recording of sensor signals, test bench signals, electric drive signals, and NVH data acquisition;

[0022] 2. Improved testing efficiency and reduced human operation risks;

[0023] 3. Reduce the risk of collecting invalid data and avoid wasted work;

[0024] 4. Add the ability to synchronously record test bench data, enrich the data, and make it easier to understand the electric drive status;

[0025] 5. Record the sensor data added to the test bench to facilitate real-time monitoring of the electric drive status. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of components used in the fully automatic NVH bench test method based on characteristic signals of the present invention.

[0027] The components in the figure are numbered as follows:

[0028] Test bench 1, NVH test equipment 2, electric drive 3, scattered sensors 4, NVH sensor 5. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to specific embodiments.

[0030] The test bench 1 and NVH test equipment 2 used in this embodiment are commonly used on the market and have the following functions:

[0031] 1. The test bench 1 running condition has program control function;

[0032] 2. Stand 1 has the function of writing signals;

[0033] 3. Test bench 1 has the function of signal packaging and sending via CAN communication;

[0034] 4. NVH test equipment 2 has CAN reading function;

[0035] 5. The NVH test equipment 2 has a signal triggering function.

[0036] like Figure 1 As shown, a fully automatic NVH bench test method based on characteristic signals is shown. Bench 1 is connected to NVH test equipment 2. Bench 1 obtains its own bench status signal and the characteristic signal generated by bench 1 for controlling the switch of NVH test equipment 2, and sends them to NVH test equipment 2. NVH test equipment 2 performs data acquisition according to the received characteristic signal and records the bench status signal.

[0037] Among them, the characteristic signal is 1&0. When the characteristic signal received by the NVH test equipment 2 changes from 0 to 1, the NVH test equipment 2 starts data collection. When the characteristic signal received by the NVH test equipment 2 changes from 1 to 0, the NVH test equipment 2 stops data collection.

[0038] To this end, after completing one data collection, the NVH test equipment 2 enters the collection preparation work for the next working condition and monitors whether the characteristic signal gives a start signal of 1.

[0039] In actual tests, the test conditions of the test bench 1 are divided into acceleration conditions, coasting conditions and uniform speed conditions, and characteristic signals are adapted in each condition. Thus, the test bench 1 is connected with the NVH test equipment 2 through the characteristic signals, thereby realizing fully automatic NVH test.

[0040] In addition, in this embodiment, the test bench 1 is connected to the electric drive 3. The test bench 1 obtains the electric drive status signal of the electric drive 3 and sends it to the NVH test equipment 2 for recording by the NVH test equipment 2. While the test bench 1 sends the characteristic signal to the NVH test equipment 2, it also sends the working condition control signal to the electric drive 3.

[0041] In this embodiment, several other scattered sensors 4 are also included, such as an oil temperature sensor provided on the electric drive 3. The test bench 1 obtains the signals of the scattered sensors 4 and sends them to the NVH test equipment 2 for recording by the NVH test equipment 2.

[0042] In addition, in this embodiment, the gantry status signal includes a rotation speed signal, a torque signal, and a temperature signal of the gantry 1 .

[0043] Finally, an NVH sensor 5 may be provided on the NVH testing device 2 . When the NVH testing device 2 collects data, the NVH sensor signal of the NVH sensor 5 is recorded simultaneously.

[0044] The fully automatic NVH bench test method based on characteristic signals of the present invention can achieve perfect interaction and recording of sensor signals, signals of the bench 1 itself, signals of the electric drive 3 and NVH data collection through characteristic signals; improve test efficiency and reduce the risk of human operation; reduce the risk of collecting invalid data and avoid doing useless work; increase the ability to synchronously record bench data, enrich the data, and make it easier to understand the electric drive status; record the sensor data added to the bench 1, and facilitate real-time monitoring of the electric drive status.

Claims

1. A fully automatic NVH bench test method based on characteristic signals, characterized by: The test bench (1) is connected to an NVH test device (2), the test bench (1) obtains a test bench status signal of the test bench (1) itself and a characteristic signal generated by the test bench (1) for controlling a switch of the NVH test device (2), and sends the signal to the NVH test device (2), and the NVH test device (2) performs data acquisition based on the received characteristic signal and records the test bench status signal; The characteristic signal is 1&0, and when the characteristic signal received by the NVH test device (2) changes from 0 to 1, the NVH test device (2) starts data acquisition, and when the characteristic signal received by the NVH test device (2) changes from 1 to 0, the NVH test device (2) stops data acquisition; After completing one data acquisition, the NVH test equipment (2) enters the acquisition preparation work for the next working condition and monitors the characteristic signal; The test working conditions of the test bench (1) are divided into an acceleration working condition, a coasting working condition and a uniform speed working condition, and characteristic signals are adapted in each working condition; The test bench (1) is connected to an electric drive (3), and the test bench (1) obtains an electric drive status signal of the electric drive (3) and sends it to the NVH test equipment (2) for recording by the NVH test equipment (2); The test bench (1) sends a characteristic signal to the NVH test equipment (2) and simultaneously sends a working condition control signal to the electric drive (3).

2. The fully automatic NVH bench test method based on characteristic signals according to claim 1, characterized in that: It also includes several other scattered sensors (4), and the test bench (1) obtains scattered sensor signals from the scattered sensors (4) and sends them to the NVH test equipment (2) for recording by the NVH test equipment (2).

3. The fully automatic NVH bench test method based on characteristic signals according to claim 2 is characterized in that: The scattered sensors (4) include an oil temperature sensor provided on the electric drive (3).

4. The fully automatic NVH bench test method based on characteristic signals according to claim 1 is characterized in that: The test bench status signal includes a rotation speed signal, a torque signal and a temperature signal of the test bench (1).

5. The fully automatic NVH bench test method based on characteristic signals according to claim 1 is characterized in that: The NVH test device (2) is provided with an NVH sensor (5), and when the NVH test device (2) collects data, the NVH sensor signal of the NVH sensor (5) is simultaneously recorded.

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