Abstract:

The structure of the vehicle semi-active suspension with the control valve was presented according to its operation principle. The heat generation mechanism and the heat balance of the semi-active hydro-pneumatic spring were analyzed from the energy transform character of the working shock-absorber and its influence on the seal reliability.The equation of integrated heat transfer were derived with the object of oil and nitrogen respectively based on proper assumption and the knowledge of heat transfer and engineering thermodynamics. A thermodynamic model was built for the semi-active hydro-pneumatic spring based on the first law of thermodynamics. The structure parameters of the system were given and the influences of relevant factors on the temperature rise were analyzed by programing. The conclusions provide a reference for the design of the hydro-pneumatic spring.

Key words: technology of instrument and meter, hydro-pneumatic spring, semi-active suspension, thermodynamic model, heat balance