Aging test temperature control method

Abstract

A temperature control method for an aging test is performed by an aging test temperature control system. The aging test temperature control system includes a test end computer, a control chassis, a chiller and a high and low temperature box. The object to be tested is placed in the high and low temperature box. The chiller is connected to the object to be tested through a pipeline. The coolant in the chiller circulates in the shell of the object to be tested through the pipeline. The aging test temperature control method includes the following steps: a. calculating the temperature difference ratio between the high and low temperature box and the chiller; b. collecting the temperature H of the coolant and the ambient temperature G of the object to be tested in the high and low temperature box; c. calculating the coolant temperature difference ΔH and the ambient temperature difference ΔG; d. judging whether the coolant temperature difference ΔH and the ambient temperature difference ΔG satisfy ΔH=rΔG, if not, executing e; e. the test end computer adjusts the temperature of the high and low temperature box through a serial port control card in the control chassis according to the current cooling temperature H1 and the preset temperature difference ratio r and returns to step b.

Description

Technical Field

[0001] The invention relates to a temperature control method, in particular to an aging test temperature control method. Background Art

[0002] In the field of autonomous driving, the environment in which the onboard server is used is complex. Designers require that in addition to the high and low temperatures of aging in product testing and development, the temperature of the liquid cooling system also needs to change. However, because the temperature range of the coolant is inconsistent with the aging environment requirements, the requirements for the test system are different. However, the current aging test temperature control system cannot automatically control the temperature of the coolant and the environment, resulting in a large difference between the aging test and the real environment, resulting in low reliability of the aging test.

[0003] In view of this, the present invention provides an aging test temperature control method, which can automatically control the coolant temperature and the test environment temperature, so that the object under test can complete the aging process of temperature change in a specified environment. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a temperature control method for aging test, which can automatically control the temperature of the coolant and the test environment temperature, so that the object under test can complete the aging process of temperature change in a specified environment.

[0005] In order to solve the above technical problems, the present invention provides an aging test temperature control method, which is performed by an aging test temperature control system. The aging test temperature control system includes a test end computer, a control chassis, a chiller and a high and low temperature box. The object to be tested is placed in the high and low temperature box. The chiller is connected to the object to be tested through a pipeline. The coolant in the chiller circulates in the shell of the object to be tested through the pipeline. The aging test temperature control method includes the following steps:

[0006] a. The test end computer calculates the temperature difference ratio r between the high and low temperature box and the chiller based on the input cooling temperature range a~b of the chiller and the control temperature range c~d of the high and low temperature box, as well as the pre-set temperature difference ratio r calculation formula as follows:

[0007] r = (ba) / (dc);

[0008] b. After the aging test temperature control system is started, the coolant temperature sensor in the chiller collects the coolant temperature H and transmits it to the temperature analysis card in the control chassis, and the ambient temperature sensor in the high and low temperature box collects the ambient temperature G of the object under test in the high and low temperature box and transmits it to the temperature analysis card, and then executes step c;

[0009] c. The temperature analysis card calculates the coolant temperature difference ΔH between the current coolant temperature H1 collected and the temperature H0 collected at the previous time point, and calculates the ambient temperature difference ΔG between the current high and low temperature box ambient temperature G1 and the high and low temperature box ambient temperature G0 collected at the previous time point, and then executes step d;

[0010] d. The temperature analysis card transmits the collected current coolant temperature H1, current ambient temperature G1, coolant temperature difference ΔH and ambient temperature difference ΔG to the test end computer. The test end computer determines whether the coolant temperature difference ΔH and ambient temperature difference ΔG meet the following conditions according to the preset temperature difference ratio r. If yes, it returns to step b, otherwise it executes the next step:

[0011] ΔH = rΔG;

[0012] e. The test end computer adjusts the temperature of the high and low temperature box according to the current cooling temperature H1 and the preset temperature difference ratio r through the serial port control card in the control chassis and returns to step b.

[0013] Preferably, the control chassis also includes a power control card, which is electrically connected to the chiller and the high and low temperature box and is used to receive control signals to control the switches of the chiller and the high and low temperature box.

[0014] Compared with the prior art, the aging test temperature control method of the present invention pre-sets the calculation formula of the temperature difference ratio r in the test end computer. When the aging test is performed on the object to be tested, the temperature range of the chiller and the high and low temperature box can be input in the test end computer. By using the pre-set temperature difference ratio r, the corresponding temperature of the high and low temperature box is calculated after obtaining the real-time temperature of the cold water. The high and low temperature box is controlled to adjust to the corresponding temperature by using the serial port control card of the control chassis, thereby allowing the object to be tested to be tested in a nearly real test environment, thereby increasing the reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a block diagram of the aging test temperature control system involved in the aging test temperature control method of the present invention.

[0016] Figure 2 The present invention is a flowchart of the steps of the temperature control method for aging test. DETAILED DESCRIPTION

[0017] See also Figure 1As shown, the present invention provides an aging test temperature control method, which is performed by an aging test temperature control system. The aging test temperature control system includes a test end computer 1, a control chassis 2, a chiller 3 and a high and low temperature box 4. The object to be tested is placed in the high and low temperature box 4. The chiller 3 is connected to the object to be tested through a pipeline. The coolant in the chiller 3 circulates in the shell of the object to be tested through the pipeline. In this embodiment, the aging test temperature control method includes the following steps:

[0018] Step S1: The test end computer 1 calculates the temperature difference ratio r between the high and low temperature box 4 and the chiller 3 according to the input cooling temperature range a-b of the chiller 3 and the control temperature range c-d of the high and low temperature box 4, as well as the pre-set calculation formula of the temperature difference ratio r as follows:

[0019] r = (ba) / (dc);

[0020] In this embodiment, if the cooling temperature range of the chiller 3 is -20°C to +60°C, and the control temperature range of the high and low temperature box 4 is -40°C to +80°C, then r=(80-(-40)) / (60-(-20))=1.5.

[0021] Step S2: After the aging test temperature control system is started, the coolant temperature sensor 30 in the chiller 3 collects the coolant temperature H and transmits it to the temperature analysis card 20 in the control chassis 2, and the ambient temperature sensor 40 in the high and low temperature box 4 collects the ambient temperature G of the object under test in the high and low temperature box 4 and transmits it to the temperature analysis card 20, and then executes step S3.

[0022] Step S3: The temperature analysis card 20 calculates the coolant temperature difference ΔH between the current coolant temperature H1 collected and the temperature H0 collected at the previous time point, and calculates the ambient temperature difference ΔG between the current ambient temperature G1 and the ambient temperature G0 collected at the previous time point, and then executes step S4.

[0023] Step S4: The temperature analysis card 20 transmits the collected current coolant temperature H1, the current ambient temperature G1 of the high and low temperature box 4, the coolant temperature difference ΔH and the ambient temperature difference ΔG to the test end computer 1. The test end computer 1 determines whether the coolant temperature difference ΔH and the ambient temperature difference ΔG meet the following conditions according to the preset temperature difference ratio r. If yes, it returns to step S2, otherwise it executes the next step:

[0024] ΔH = rΔG

[0025] In this embodiment, if the current H1 is -19°C, the current G1 is -38.5°C, the H2 at the previous time point is -20°C, and the G2 at the previous time point is -40°C, then ΔH=1, ΔG=1.5, and r=1.5, which satisfies ΔH= rΔG.

[0026] Step S5: the test end computer 1 adjusts the temperature of the high and low temperature box 4 through the serial port control card 21 in the control box 2 according to the current cooling temperature H1 and the preset temperature difference ratio r and returns to step S2.

[0027] In this embodiment, the control chassis 2 also includes a power control card 22, which is electrically connected to the chiller 3 and the high and low temperature box 4, and is used to receive control signals to control the switches of the chiller 3 and the high and low temperature box 4, thereby realizing automated testing.

[0028] The aging test temperature control method of the present invention pre-sets the calculation formula of the temperature difference ratio r in the test end computer 1. When the aging test is performed on the object to be tested, the temperature range of the chiller 3 and the high and low temperature box 4 can be input into the test end computer 1. By using the pre-set temperature difference ratio r, the temperature corresponding to the high and low temperature box 4 is calculated after obtaining the real-time temperature of the chiller 3. The serial port control card 21 of the control chassis 2 is used to control the high and low temperature box 4 to adjust to the corresponding temperature, thereby allowing the object to be tested to be tested in a nearly real test environment, thereby increasing the reliability of the test.

[0029] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A temperature control method for an aging test, which is performed by an aging test temperature control system, the aging test temperature control system includes a test end computer, a control chassis, a chiller and a high and low temperature box, the object to be tested is placed in the high and low temperature box, the chiller is connected to the object to be tested through a pipeline, and the coolant in the chiller circulates in the shell of the object to be tested through the pipeline. The aging test temperature control method includes the following steps: a. The test end computer calculates the temperature difference ratio r between the high and low temperature box and the chiller based on the input cooling temperature range a~b of the chiller and the control temperature range c~d of the high and low temperature box, as well as the pre-set temperature difference ratio r calculation formula as follows: r = (ba) / (dc); b. After the aging test temperature control system is started, the coolant temperature sensor in the chiller collects the coolant temperature H and transmits it to the temperature analysis card in the control chassis, and the ambient temperature sensor in the high and low temperature box collects the ambient temperature G of the object under test in the high and low temperature box and transmits it to the temperature analysis card, and then executes step c; c. The temperature analysis card calculates the coolant temperature difference ΔH between the current coolant temperature H1 collected and the temperature H0 collected at the previous time point, and calculates the ambient temperature difference ΔG between the current high and low temperature box ambient temperature G1 and the high and low temperature box ambient temperature G0 collected at the previous time point, and then executes step d; d. The temperature analysis card transmits the collected current coolant temperature H1, current ambient temperature G1, coolant temperature difference ΔH and ambient temperature difference ΔG to the test end computer. The test end computer determines whether the coolant temperature difference ΔH and ambient temperature difference ΔG meet the following conditions according to the preset temperature difference ratio r. If yes, it returns to step b, otherwise it executes the next step: ΔH = rΔG; e. The test end computer adjusts the temperature of the high and low temperature box according to the current cooling temperature H1 and the preset temperature difference ratio r through the serial port control card in the control chassis and returns to step b.

2. The aging test temperature control method according to claim 1, characterized in that: The control chassis also includes a power control card, which is electrically connected to the chiller and the high and low temperature box and is used to receive control signals to control the switches of the chiller and the high and low temperature box.

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