[TMS] Daihatsu Exhibits Light Concept Car 'HSC,' Aiming at 33km/L

Oct 29, 2007
Tatsuhiko Hayashi, Nikkei Automotive Technology
The Daihatsu "HSC"
The Daihatsu "HSC"
[Click to enlarge image]

Daihatsu Motor Co Ltd exhibited a light-duty concept car "HSC" with a target fuel economy of 33km/L at the 40th Tokyo Motor Show. It is a 4-seat K-car based on existing technologies and mounted on the same platform as the Mira.

The company exhibited a hybrid light-duty vehicle "UFE-III (Ultra Fuel Economy three)," that aims at extra low fuel economy of 72km/L at the Tokyo Motor Show 2005. The vehicle currently exhibited adopts more realistic technologies for reduction of fuel consumption.

Special attention was given to the side members of the body. Normally, side members are sloped down at the joint between the engine compartment and the floor, and then sloped up at the rear suspension area. This normal structure has many bending points, requiring sturdy side members that can absorb collision energy.

On the other hand, the side members in the rear of the joint are straight in the frame adopted by HSC. To realize this structure, the floor was designed higher than normal vehicles and the rear suspension was mounted under the bottom of the floor. The floor level is 365mm above the ground, with the floor and the luggage compartment on the same flat level.

The improvement of energy absorption efficiency of side members enables reduction of steel plates used for the body. This improvement is expected to reduce the vehicle weight to about 700kg, which is more than 50kg lighter than normal light-duty vehicles.

In aerodynamics, the Cd value was reduced for lower air resistance. The Cd value of the concept car is 0.28, while that of Mira is 0.31.

It is mounted with a 0.66-L 3-cylindar engine, CVT and idling stop function. The body is dimensioned 3,395 (L) × 1,475 (W) × 1,550mm (H), while the wheel base is 2,490mm.

The floor level is 365mm high
The floor level is 365mm high
[Click to enlarge image]
The frame structure, with a straight floor joined in the rear
The frame structure, with a straight floor joined in the rear
[Click to enlarge image]