Search Results

In order to optimize the balance between aerodynamics and air-cooling performances for a motorcycle, a simulation method of external flow around a vehicle has been developed. In this paper, steady-state flow calculations were performed using two types of turbulence models, the realizable k-ε and the SST k-ω, and two levels of mesh sizes of computational models and their results were compared. To validate the computational results, wind tunnel tests were conducted and CD, CL and mean velocity of flow passing through heat exchangers were measured. The computational results on drag coefficient and mean velocity show good agreements with the experimental ones.

The Hino E13C was developed for heavy-duty truck application to meet Japan's 2003 NOx and 2005 particulate emissions standards simultaneously with significant fuel economy improvement. A combined EGR system consisting of an external EGR system with a highly efficient EGR cooler and an internal EGR system with an electronically controlled valve actuation device was newly developed to reduce NOx emissions for all operating conditions without requiring a larger engine coolant radiator. A Hino-developed DPR was installed to achieve extremely low particulate emissions at the tail pipe. Increased strength of engine structural components and a ductile cast iron piston enabled high BMEP operation at lower engine speeds and reductions of both engine size and weight. This paper describes key technologies developed for the E13C as well as the development results.

It is mandatory to equip DRL (Daytime Running Light) with cars in high-altitude countries such as Canada and Nordic countries. These days safety effects of the DRL system has been confirmed, leading to voluntary standard equipment in the U.S. where DRL is not mandatory yet. We have supplied DRL to the automotive market since 1990. Our DRL is mainly a power resistor type which requires a resistor as a system component and an ECU (Electrical Control Unit). In order to accelerate the adoption of the DRL as standard equipment, we have determined that it needs low man power for installation and be a system of small size. With this in mindwe started the development of the PWM - type (Pulse Width Modulation) DRL, which doesn't require a power resistor. Other vehicle electronics, however, near a PWM - type device may be susceptible to switching noise, i.e., radio frequency noise effects. In this paper, we will report on the PWM - type DRL which has achieved: 1. RF noise: -86 dBm 2.