A New Method to Design Cam Used in Automobile Heating, Ventilating and Cooling System
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IGINAL CONTRIBUTION
A New Method to Design Cam Used in Automobile Heating, Ventilating and Cooling System B. Singh • D. Singh • J. S. Saini
Received: 27 January 2012 / Accepted: 21 September 2012 / Published online: 23 November 2012 Ó The Institution of Engineers (India) 2012
Abstract With the automotive air-conditioning industry aiming at better levels of quality, cost effectiveness and short time to market, the need for simulation is at an all time high. In the present study, the airflow control mechanism of an automotive heating, ventilating and cooling module for opening various doors/dampers were kinematically analyzed. A new method for cam design was developed which is faster and simpler than the existing oscillating link method. The existing design was modified for the same output using the new cam design method. It is shown that the torque required in the modified design is lesser than that in the existing design, thus lowering the effort required to rotate the cam from the control panel. Keywords CAE tools
Kinematics HVAC Cam design
Introduction HVAC module is a very important part of the automotive air-conditioning system, shown in Fig. 1. The design and validation of the HVAC kinematics is a crucial step in the design process of the complete module. The kinematic mechanism in the HVAC module controls the air flow in various modes (foot, face, defrost) by the movement of doors/dampers. Traditionally this design is done using the basic principles of kinematics and dynamics on a simplified geometry of a kinematic chain, and the outputs are validated by testing physical prototypes. B. Singh D. Singh J. S. Saini (&) Mechanical Engineering Department, Thapar University, Patiala 147004, Punjab, India e-mail: [email protected]
In today’s era, CAE tools have made design and analysis faster, reducing time to market. The design of the HVAC kinematic parts, validation by finding the displacement of doors/dampers w.r.t. cam rotation and the effort required to operate the cam can be explored by using the virtual simulation CAE tools. A number of researchers have worked on the analysis and design of different automobile components using CAE tools. A brief review of such study is given in the following paragraph. Parvir and Gim [1] performed ride and stability analysis of sports car using multibody dynamic simulation. The study summarized the joint coordinate formulation for automatic generation of the equations of motion for dynamic analysis of multibody systems. It was observed that the energy dissipation of the continuous contact model proposed by Lankarani and Nikravesh [2] results in long periods of time when the journal seats in the bearing, thus leading to a much smoother dynamic response of the system. For the friction model, the use of the LuGre model proposed by Canudas et al. [3] was used in the study. This physics based model was capable of capturing a number of experimentally observed phenomena associated with friction. Bertorelli et al. [4] performed structural crash analysis with ADAMS to ma
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