The Research Of Heat Exchanging System Diathermanous Performance Between The Engine And Hydraulic Retarder

With the developing of domestic traffic, the status of traffic and traffic capability of vehicle has improved greatly, the load and quantity of commercial vehicle is demanded much more either. The performance of vehicle has been improving, including average velocity and the power of engine, while no perfect breakthrough on the vehicle brake performance all over the world. For the limitation of brake system dimension and cooling system capability, the accumulation of heat produced by brake system results in safety question of drivers, occupants, pedestrian and vehicle.The vehicle must be equipped with auxiliary braking system besides the service brake to ensure the well brake performance. As a kind of auxiliary brake system, hydraulic retarder can reduce the load of the service brake, make vehicle slowdown smoothly, enhance the reliability of the brake system, and reduce the traffic cost greatly. The hydraulic retarder is very suitable for continuous braking since it has many advantages such as: durable performance, high braking power and good quality of control, the development prospect of it is promising. Research and application of hydraulic retarder has been deeply investigated abroad, while theory research and samples development just begin in china.The purpose of this study is to collect relevant information in a wide range of conditions,mainly to a foreign model for the study of hydraulic retarder using CAD/CAE/CAM integration technology research the heat exchanger of the cooling system between the engine and retarder,using CATIA software to design the structure of the cooling system between the engine and retarder and use the MATLAB software to simulate the cooling system when retarder brakes in various shift.To provide a theoretical reference to the development of hydraulic retarder, and design for enterprise, providing specific guidance on the production method of hydraulic retarder.In this paper, combining work and school cooperation is the high-tech projects, including the following aspects:1. Summarizing principle and characteristics of the hydraulic retarder reviewing the domestic and international appliction of hydraulic retarder in detail.combining with high cooling water temperature problem of the hydraulic retarder heat exchange system when hydraulic retarder brake performance tests defined objectives and direction.2. Making use of CATIA 3D designing software to carry through virtual assembly for the key components of the engine and hydraulic retarder heat exchanging system.3. Do the heat exchanging vehicle experiment about hydraulic retarder, using Oringin processing software to fit the experiment data to curve and analyze the experiment curve.4. Based on the diathermanous theory to build hydraulic retarder heat exchanging model, using SIMULINK software to simulate the heat exchanging process of the hydraulic retarder under every braking shift . Getting valuable temperature—time simulating curves ,then compare the simulating curve with the experimental curve to discover two curve in good agreement to prove the simulating model validity.5. Develop pilot process control strategies ,as well as ideas for the improvement of the experiment after a more in-depth studies.