| The air mix door is the most important apparatus to alter temperature in automotive air conditioner,so the precise control of it is quite important for design or research of air conditioner. Now the most popular control apparatus of air mix door are cam mechanisms,and they have some advantages:the compact structure,low manufacturing cost,short design cycle,etc.But most of them are absolutely manual control mechanisms,so they also have some disadvantages. The pricise control of the door angle,ensuring the temperature linearity and the load optimization are the key problems in design.This paper established a dynamic model of the air mix door control mechanism with ADAMS software, and studied on the motion curve of air mix door,cam pressure angle , load condition,etc. The formula of load transmission for cam control mechanism was inferred by theoretical calculation. Then this paper used the parameterizing function in ADAMS to establish a optimization model which used the cable force as the optimizing target,the motion curve of door and the coordinate of key points as the design variables,the pressure angle as the constraint.Through this model ,it can calculate and generate the optimum control mechanism of air mix door automatically.After the dynamic simulation,a test rig for the control mechanism of air mix door was designed and constructed .The tests included torque test for air mix door and the force test for cable. With the test result and simulation result, we could combine them to get further analysis. At last this paper designed an interface for designing the door control mechanism by the developing language of ADAMS software. It made the process of optimizing load and generating cam profile interfacial and visual. |
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