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Hino Motors has developed the new K13C, a 12.9 liter six cylinder in-line, heavy duty diesel engine that provides superior fuel consumption, extra low noise and excellent driveability together with a lower exhaust emissions. The initial K13C engine, whose production began in 1986 and about 30,000 units have been produced, is recognized all over the world for its good reliability and fuel economy. The new K13C is using the basic design and manufacturing/assembly processes of the previous one but includes a common-rail type fuel injection system with enhanced electronic controls to meet future regulation and customer requirements. Major design changes consist of a new cylinder head, a new front gear train, a new air intake system, a new turbocharger, a new compression brake system and electronic control module. The optimization of the intake system includes a new intake port and an electronically controlled inertia charging system.

The development is completed of a new 48″ roll chassis dynamometer for 2 wheel drive (2WD) and 4 wheel drive (4WD) light duty vehicle (LDV). Overhung roll configuration onto the shaft of a hydraulic frame floated AC dynamometer is applied. Braking force measurement accuracy of PAU is ±0.1% of full scale. Vehicle traction force can be measured in high response manner without wheel torquemeter. The above and some new instrumentation architecture are reported. Digital vector controller for PAU and a new digital road load controller enabled 90% step response in 75 ms. Besides that, a dynamic road load verification method and 4WD application is reported.

This paper introduces the details of a low noise design realized by fully utilizing the theoretical methods for the prediction of noise and vibration, applied to Hino's new “H07D” engine. In the development of this engine, the reduction of the vehicle interior noise was one of the highest priority aims. For this purpose, the influence of the engine noise on the vehicle noise was firstly investigated to identify the major noise sources. Then, making best use of noise prediction techniques (FEM, etc.), the noise radiation mechanisms were clarified and the components identified as major noise sources were re-designed. In these improvements, the theoretical techniques also predicted carefully the effect of design changes on the related components, including their installation in an engine as required. These procedures achieved a remarkable noise reduction of the engine by cost effective methods.

Asynchronous a.c. dynamometers have recently made a considerable penetration into the market because they permit four-quadrant operation like d.c. dynamometers, and in addition, less maintenance is required. With the controllers using conventional thyristor inverters, however, the torque ripple at low speeds is considerable and the application is limited. In order to solve this problem, we developed controllers using power transistor inverters, this resulted in improvement such as the reduction of physical dimensions of dynamometers and controllers, improvement of power supply power factor and a reduction in torque ripple.