Control method for rapid temperature change of automobile environment wind tunnel

Abstract

The invention belongs to the technical field of automobile environment wind tunnel temperature control, and particularly relates to a control method for rapid temperature change of an automobile environment wind tunnel, which comprises the following steps: S1, calculating a difference value e obtained by subtracting an actual temperature from a current target temperature; s2, if the differential of the current target temperature t to the time is analyzed, the step S3 is executed, and if the differential of the current target temperature t to the time is executed, the step S4 is executed; if so, turning to S5; s3, the heating side works; the method comprises the following steps: calculating a target temperature demand heating thermal load delta Q heating demand in feed-forward control, calculating a thermal load total amount Q of an environment wind tunnel, and then calculating a heating side large valve feed-forward total thermal load Q total = Q + delta Q heating demand; and after the feed-forward opening degree of the large valve on the heating side is calculated according to the Q total, feed-forward control is carried out on the large valve on the heating side, and PID control is carried out on the small valve on the heating side according to the e. According to the method, when the temperature of the environment wind tunnel is dynamically adjusted, the real-time error between the actual temperature of the environment wind tunnel and the target temperature is controlled to be + / -0.5 DEG C.

Description

technical field

[0001] The invention belongs to the technical field of temperature control in an automobile environment wind tunnel, and in particular relates to a control method for rapid temperature change in an automobile environment wind tunnel. Background technique

[0002] The automotive environment wind tunnel is a very important laboratory in the research and development of automobiles, which can simulate the real climate environment outside. Among them, temperature simulation is the key to realize the environmental wind tunnel to simulate the external environment. Therefore, the requirements for the temperature simulation system are extremely high, and the accuracy requires ±0.5°C.

[0003] In the prior art, PID control is used as the leading factor to regulate the temperature of the environment wind tunnel. Specifically, according to the deviation between the target temperature and the actual temperature, △e is greater than 0 or less than 0, select the control on ...

Examples

Embodiment 1

[0052] Such as figure 1 As shown, a control method for rapid temperature change in a wind tunnel in an automotive environment, including:

[0053] S1, calculate the difference Δe between the current target temperature and the actual temperature; and calculate the current target temperature t 驻室 differentiation with respect to time

[0054] S2, Analysis like Then go to S3, if Then go to S4; if Then go to S5;

[0055] S3, work on the heating side, close the large valve and small valve on the cooling side; according to Calculation of target temperature demand heating load ΔQ in feedforward control 升温需求 , and calculate the total heat load Q of the ambient wind tunnel, and then calculate the total heat load Q of the large valve feed-forward on the heating side 总 =Q+ΔQ 升温需求 ; and according to Q 总 Calculate the feedforward opening of the large valve on the heating side. When calculating the feed-forward opening of the large valve on the heating side, it can be calcu...

technical field

[0001] The invention belongs to the technical field of temperature control in an automobile environment wind tunnel, and in particular relates to a control method for rapid temperature change in an automobile environment wind tunnel. Background technique

[0002] The automotive environment wind tunnel is a very important laboratory in the research and development of automobiles, which can simulate the real climate environment outside. Among them, temperature simulation is the key to realize the environmental wind tunnel to simulate the external environment. Therefore, the requirements for the temperature simulation system are extremely high, and the accuracy requires ±0.5°C.

[0003] In the prior art, PID control is used as the leading factor to regulate the temperature of the environment wind tunnel. Specifically, according to the deviation between the target temperature and the actual temperature, △e is greater than 0 or less than 0, select the control on ...

Examples

Embodiment 1

[0052] Such as figure 1 As shown, a control method for rapid temperature change in a wind tunnel in an automotive environment, including:

[0053] S1, calculate the difference Δe between the current target temperature and the actual temperature; and calculate the current target temperature t 驻室 differentiation with respect to time

[0054] S2, Analysis like Then go to S3, if Then go to S4; if Then go to S5;

[0055] S3, work on the heating side, close the large valve and small valve on the cooling side; according to Calculation of target temperature demand heating load ΔQ in feedforward control 升温需求 , and calculate the total heat load Q of the ambient wind tunnel, and then calculate the total heat load Q of the large valve feed-forward on the heating side 总 =Q+ΔQ 升温需求 ; and according to Q 总 Calculate the feedforward opening of the large valve on the heating side. When calculating the feed-forward opening of the large valve on the heating side, it can be calcu...

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