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To improve vihicle compartment comfort, there has been a great demand for the development of odor filters which reduce odors, especially external diesel exhaust odors. Therefore, in efficiently developing cabin air filter combining dust removal and deodorant functin, a quantitative formula which enables acquisition of the correlation between sensory evaluation values and instrumental analysis values of odors has been designed and verified. We developed a deodorizing filter that effectively deodorized with minimal use of deodorant, combined with a dust filter based on these figures, to develop a high-performance air conditioning cabin air filter.

In recent years, concerns with global environmental problems have become major issues. Environmental regulations such as fuel consumption/economy, for example, have become very stringent. On the other hand, the pursuit of a comfortable and spacious passenger compartment and reduced engine compartment room have become more progressive. Size and weight reduction of automotive components are necessary to cope with these requirements. With regards to the fuel filter, size reduction of the filter element is the key technology to achieve both component size and weight reduction. As to a fuel filter, the reduction of its size and weight can be accomplished by reducing the size of its element. We have studied this subject and have invented a new type of element structure. Additionally, we have developed a new filter paper which features a favorable combination of contaminant holding capacity and micron rating.

Environmental control of the passenger compartment has become increasingly important and sophisticated. One major consideration of interior comfort is clean, healthful, aromatic air. Accordingly, two new products were developed to increase the dust removing and deodorizing effects. These are the “Air Purifier” and the air conditioner ventilation filter called the “Air Refiner”. The Air Purifier affects the air inside the vehicle, and the Air Refiner affects the air from outside the vehicle. Remarkable effects are achieved by employing a newly developed material called “Impregnated Activated Carbon Fiber (IACF)” which is utilized in both the Air Purifier and the Air Refiner. In addition to the air purification system, a new fragrance control system called the “Aroma Controller” was developed. The Aroma Controller allows the user to select from three aromatic fragrances. The fragrance is emitted intermittently by way of “1/f fluctuation control” via microcomputer control.