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Journal Article
Shigeru Suzuki
In 1991, Hino Motors, Ltd. (Hino) launched the world's first hybrid city buses in the market. Thereafter, Hino has improved its hybrid vehicle technology and applied it to various commercial vehicles including city buses, sightseeing buses, medium-duty trucks and light-duty trucks. Recently, Hino has developed light-duty hybrid trucks, whose fuel efficiency has improved by 50% relative to its Diesel trucks. The significant improvement in fuel efficiency is achieved by four improvements in hybrid trucks. First, the hybrid system is improved: the change in the drive train layout, the relocation of a clutch, makes it possible to recoup the regenerative energy more efficiently. Second, the vehicle is also improved by the new hybrid engine, the reduction of the rotation speed of the engine during idling, and the improvement in the differential gear ratio. Third, new hybrid system controls are developed to bring benefits of the hybrid system to all drivers.
Technical Paper
Fujio Momiyama, Michihito Morikawa
The driving performance of a vehicle with front wheel steering system is enhanced by controlling the gain and/or phase-lag characteristics. A vehicle with rear axle steering system has an even or higher effect than that. The compliance steer control effect in mechanical system is the key technology for enhancing the on-center stability Driver's error compensating system by steering and/or brake system control will be in future, and the manual and automonous control hybrid driving system will follow it.
Technical Paper
Yasunori Urano, Yutaka Nakano, Hitoshi Takada, Mitsuharu Sugita
The enhancement of emission regulations and the enforcement of mileage regulations are a global phenomenon. To make engines satisfactorily meet such regulations in the short term, innovations in engine development technology are essential. In this paper, an innovative technique for the optimization of the transient performance of engines, ‘STATE’, was developed. Recently, the Design of Experiments (DoE) has gradually been used to optimize the static performance of engines, however it takes a long time to create a response surface model including all operating conditions of an engine. The newly developed technique ‘STATE’ shown in this paper was able to create the response surface model in a very short time by means of multivariate analysis of the transient performance data of time series. A new transient engine test cycle, named ‘universal mode’, was developed for the efficient creation of response surface models.
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