A DHT motor temperature rise test method

Abstract

The present invention discloses a DHT motor temperature rise test method, wherein the test device used in the method is a transmission performance test bench, and the tested part is a hybrid-specific transmission DHT. When conducting the test, the DHT to be tested is first modified, the oil supply pipe of the motor cooling pipeline is disconnected, a hole of suitable size is processed on the nearby transmission housing, the disconnected oil supply pipe is led from the housing opening to the outside of the transmission, a proportional control valve and a flow meter are installed in the middle of the pipeline, and the bypass pipeline of the proportional control valve is also led from the housing opening to the inside of the transmission. The modified DHT to be tested is installed on the transmission performance test bench, the bench control system is used to control the proportional control valve, and the flow value measured by the flow meter is read in real time. This method can realize the temperature rise test of the hybrid-specific transmission DHT under the actual machine operation state.

Description

Technical Field

[0001] The present invention relates to a performance test method for a hybrid transmission DHT, and in particular to a test method for performing a temperature rise test of a hybrid transmission DHT motor on a transmission performance test bench. Background Art

[0002] As the core component of the hybrid transmission DHT, the performance of the motor determines the performance level of the entire DHT machine, and the speed of the motor's temperature rise directly affects the length of time the motor can output high power. Therefore, the motor temperature rise test is a very important performance test item in the development process of the hybrid transmission DHT. At present, the commonly used motor temperature rise test method is to conduct a temperature rise test on the motor unit on the motor test bench. The DHT motor is integrated inside the transmission and has no separate housing. When conducting a bench performance test on the motor, it is necessary to design a special housing tool to ensure that the motor can be installed on the bench for testing. This leads to a great difference between the operating environment of the motor during the bench test and the operating environment of the motor inside the DHT. The different operating states of other components inside the DHT will also have different effects on the temperature rise of the motor. Therefore, using a housing tool to conduct a motor temperature rise test on the motor test bench cannot truly reflect the temperature rise level of the motor when it is integrated inside the DHT. Summary of the invention

[0003] In order to meet the temperature rise test requirements of a DHT motor of a hybrid transmission in a complete machine state, the present invention provides a DHT motor temperature rise test method, which can realize the temperature rise test of the hybrid transmission DHT in a real machine operation state.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A DHT motor temperature rise test method comprises the following steps:

[0006] Step 1: Modify the hybrid transmission DHT to be tested, disconnect the oil supply pipe of the motor cooling oil pipe, and machine a hole of appropriate size in the transmission housing near this position;

[0007] Step 2: At the opening, use an external inlet oil pipe to connect the front end of the disconnected part of the oil supply pipe to the inlet of the proportional control valve, connect the outlet of the proportional control valve to the inlet of the flow meter, and use an external outlet oil pipe to connect the outlet of the flow meter to the rear end of the disconnected part of the oil supply pipe. The bypass port of the proportional control valve is introduced into the transmission through the external bypass oil pipe.

[0008] Step 3: Install the modified DHT on the transmission performance test bench, and connect the various components of the hybrid transmission DHT motor (drive dynamometer, transmission shaft, rear axle, absorption dynamometer and other components and equipment) in the conventional installation method;

[0009] Step 4: Connect the proportional control valve and flow meter to the test bench main control system;

[0010] Step 5: Operate the test bench and control the test bench dynamometer according to the established test conditions. Control the motor cooling flow rate by controlling the opening ratio of the proportional control valve to test the temperature rise performance of the DHT motor under different operating conditions and different cooling flow rates.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] When conducting the temperature rise test of the motor inside the DHT, the test method of the present invention does not need to take the motor out of the DHT for separate testing, and does not change the internal structure of the DHT. The operating environment of the motor is completely consistent with the actual DHT machine, and various factors that affect the temperature rise performance of the motor are not changed. The test method can more truly reflect the temperature rise characteristics of the motor in the actual working process, and the test results are more authentic and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the test schematic diagram of the DHT motor temperature rise test. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be included in the protection scope of the present invention.

[0015] The present invention provides a DHT motor temperature rise test method, wherein the test device used in the method is a transmission performance test bench, and the tested part is a hybrid special transmission DHT. Figure 1 As shown in the figure, the DHT under test is first modified, the oil supply pipe of the motor cooling pipeline is disconnected, a hole of appropriate size is processed on the nearby transmission housing, the disconnected oil supply pipe is led from the housing opening to the outside of the transmission, a proportional control valve and a flow meter are installed in the middle of the pipeline, and the bypass pipeline of the proportional control valve is also led from the housing opening to the inside of the transmission. The modified DHT under test is installed on the transmission performance test bench, the bench control system is used to control the proportional control valve, and the flow value measured by the flow meter is read in real time.

[0016] During the test, according to the operating status of the hybrid transmission DHT on the actual vehicle, various operating conditions required for the temperature rise test on the test bench are selected. By controlling the opening ratio of the proportional control valve, the lubricating oil flow rate supplied to the motor spray cooling is controlled to test the temperature rise performance of the DHT motor under different operating conditions and different cooling flow rates, including:

[0017] Motor speed control: with 500rpm as the gradient, test to the maximum speed of the DHT motor under test;

[0018] Motor torque control: with a gradient of 25Nm, test to the maximum torque of the DHT motor under test;

[0019] Cooling flow control: Use 1L / min as the gradient to test the maximum flow that can be achieved under the current operating conditions.

[0020] Taking a DHT transmission of Harbin Dongan Automotive Power Co., Ltd. as an example, after the transmission was modified according to the above-mentioned modification method, it was installed on the transmission performance test bench. According to the above-mentioned test conditions, the temperature rise performance of the DHT motor under different operating conditions and different cooling flow rates was tested. Some test results are shown in Table 1.

[0021] Table 1

[0022]

Claims

1. A DHT motor temperature rise test method, characterized in that The method comprises the following steps: Step 1: Modify the hybrid transmission DHT to be tested, disconnect the oil supply pipe of the motor cooling oil pipe, and machine a hole of appropriate size on the transmission housing near the disconnection position of the oil supply pipe; Step 2: At the opening, use an external inlet oil pipe to connect the front end of the disconnected part of the oil supply pipe to the inlet of the proportional control valve, connect the outlet of the proportional control valve to the inlet of the flow meter, and use an external outlet oil pipe to connect the outlet of the flow meter to the rear end of the disconnected part of the oil supply pipe. The bypass port of the proportional control valve is introduced into the transmission through the external bypass oil pipe. Step 3: Install the modified DHT on the transmission performance test bench and connect the various components of the hybrid-specific transmission DHT motor in the conventional installation method; Step 4: Connect the proportional control valve and flow meter to the test bench main control system; Step 5. Run the test bench and control the test bench dynamometer according to the established test conditions. Control the motor cooling flow rate by controlling the opening ratio of the proportional control valve to test the temperature rise performance of the DHT motor under different operating conditions and different cooling flows. Among them, motor speed control: use 500rpm as a gradient to test the maximum speed of the DHT motor under test; motor torque control: use 25Nm as a gradient to test the maximum torque of the DHT motor under test; cooling flow control: use 1L / min as a gradient to test the maximum flow rate that can be achieved under the current operating conditions.

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