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The purpose of this study is to present a new method for controlling a car air conditioning system, in which the air temperature can be controlled to produce any level of occupants' thermal sensation by utilizing car occupants' skin temperatures as a controlling index. In this paper, an equation for a quantitative evaluation of car occupants' thermal sensation, in steady and non-steady states, by face skin temperature and its rate of change was developed and was confirmed by experiments in an environmental chamber to be applicable for all seasons with an accuracy of ±1 in the thermal sensation voting scale we used.

A new type closed loop A/F control carburetor has been developed. In the carburetor, an air jet, a by-pass stream of an intake air flow, is made to collide with a fuel flow to suppress the flow rate. Studies were made of the basic features of the method such as fuel controlling capability and the factors affecting it from phenomenological consideration and schlieren observation. For comparison, three types of carburetors were prepared for the conbination of main and idle fuel circuits. In driving mode tests on a dynamometer, a new carburetor which employs the new method for the main fuel circuit, provides 30 % lower emission level than an air bleed control carburetor. Higher controlling frequencies were obtained for the new carburetors. The high controllability of the air jet collision control method is attributable to the smaller fluctuation in both the controlling air and the spouting fuel.

We have developed a simple and lower cost mixed air flow fan with guide vanes on the blade surfaces for use in automotive engine cooling. Through investigation of the fan performance and flow visualization, the axial and radial flow produced by this fan proved to be most suitable and efficient for engine cooling. The improved efficiency and increased air flow provided by this fan contribute to reduction of specific noise level and power consumption as compared to conventional fans. It is moreover possible to reduce the size and dimensions of the fan while maintaining its cooling performance. It is also useful for eliminating heat dwelling and high temperature problems from the exhaust pipe and carburetor in the engine room.

An air velocity sensor has been developed to measure the air velocity distribution at a radiator front. And, an air velocity distribution meter system for a radiator has also been developed, which can display a radiator airflow rate, a constant air velocity line graphs and a perspective representation graph, by use of many air velocity sensors mounted on the radiator front and a computer for data processing. The airflow rate and its distribution under various running conditions for passenger car (1.8 ℓ) has been measured with the air velocity distribution meter.