Method for ensuring consistency of boundary conditions of cooling system
A technology of cooling system and boundary conditions, applied in the field of automobile manufacturing, can solve the problems of inconsistent temperature and pressure of boundary conditions, poor degassing performance of engine cooling system, unreliable test results, etc., and achieve the effect of improving reliability.
Active Publication Date: 2011-02-16
CHERY AUTOMOBILE CO LTD
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Problems solved by technology
The filling and degassing performance of the current engine cooling system is poor, and it is easy to cause inconsistent boundary conditions (temperature, pressure) in the cooling test, resulting in unreliable test results
Method used
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Embodiment 1
[0019] After the structure of the engine cooling system is determined, first determine the reference values of the boundary values of the cooling system as a reference for subsequent cooling system tests, specifically including the following steps:
[0020] A: When the engine is not working, fill the engine cooling system with coolant;
[0021] B: After the engine runs for a predetermined time (30 minutes) at low load (no load) and medium-high speed (3000 r / min), stop to cool down, and continue to add cooling to the engine cooling system after the coolant is fully cooled liquid;
[0022] C: Repeat step B until the local non-circulation of the cooling system and the poor exhaust inside the cooling system are eliminated, so that the coolant fills the entire cooling system;
[0023] D: Adjust the height of the coolant in the expansion tank and the outlet water temperature of the engine, respectively when the coolant level is at the upper and lower limits of the expansion tan...
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The invention provides a method for ensuring consistency of boundary conditions of a cooling system in order to improve the reliability of test data of the cooling system of an engine. By improving a method and steps of injecting a cooling liquid, partial non-circulation of the cooling system and unsmooth internal exhaustion of the cooling system are eliminated so as to allow the cooling liquid to fill the whole cooling system. Under the condition, the method comprises the following steps of: measuring each boundary value of the cooling system and recording the boundary values as reference values; and testing each boundary value before every test for the cooling system, comparing test results with the reference values, adjusting test conditions according to the reference values until errors between the boundary values and the reference values are controlled within a predetermined range, and then testing the cooling system. Therefore, the measured parameters can be ensured to be consistent; and the reliability of the test data of the cooling system of the engine can be improved.
Description
technical field [0001] The invention belongs to the technical field of automobile manufacturing, in particular to a test method for an engine cooling system. Background technique [0002] During the development stage of a car, a series of tests on its engine cooling system are required to ensure that the cooling system meets the design requirements. During the test, it is necessary to ensure that the boundary conditions of each test have good consistency, so as to make the test results credible. The filling and degassing performance of the current engine cooling system is poor, which may easily cause inconsistent boundary conditions (temperature, pressure) in the cooling test, resulting in unreliable test results. Contents of the invention [0003] The purpose of the invention is to propose a method for ensuring the consistency of the boundary conditions of the cooling system, so as to improve the credibility of the test data of the engine cooling system. [0004] The ke...
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IPC IPC(8): G01M15/00
Inventor 杜鸿震
Owner CHERY AUTOMOBILE CO LTD