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Technical Paper

Advances of Hino J-series Diesel Engines

2003-03-03
2003-01-0054
Approximately 200,000 units of Hino J-series diesel engine were produced for 7 years. The J-series engines had a reputation all over the world for their performance, reliability, lightweight, and installation ability. They are composed of 4, 6 cylinders engines and unique 5-cylinder engine J07C. In 2002, newly modified J-series engines, which met the Japan 2001 noise emission regulations, were developed and J07C-TI, 5-cylinder TI engine, equipped with a common-rail fuel injection system was added in the J-series. Common-rail fuel injection system was equipped in order to achieve the emission targets in the future as well as to meet the current emission regulations. Achieving higher injection pressure level through the all engine speed, include excess low speed, was effective in reduction of PM emissions and in increasing of low engine speed torque drastically.
Technical Paper

Development of J-Series Engine and Adoption of Common-Rail Fuel Injection System

1997-02-24
970818
Hino has developed new J-series medium-duty diesel engines for trucks and buses. The new J-series comprises four, five and six-cylinder engines with the same cylinder bore and stroke and with both naturally aspirated and charge air cooled. Both output and torque have been enhanced along with fuel efficiency in an engine that is lighter and more compact than ever and reaches new heights of durability and reliability. J-series engine features a 4-valve system and OHC valve train design, which achieved an uniform combustion by a centered nozzle and combustion chamber design. This decreases the maximum combustion temperature and hence improved the NOx,smoke and PM emissions. And a reduced pumping loss results in improving the fuel consumption. J-series engines thus meet the Japanese 1994 emission regulations. Another feature is a fully electronically controlled common-rail fuel injection system, which is equipped in a specified engine of naturally aspirated 6 cylinder.
Technical Paper

State-of-the-Art; Hino High Boosted Diesel Engine

1993-11-01
931867
In the Japanese heavy duty truck market, demands of improved fuel economy and lighter vehicles to increase load capacity, and further improvements in emissions are constantly increasing. To satisfy these requirements, basically a smaller sized and higher boosted diesel engine is effective, because such an engine has a compact size and light weight, and shows improved fuel consumption due to a relatively lower frictional loss. On the basis of this concept Hino introduced the original EP100 in 1981 as the first Japanese turbocharged and air to air charge-cooled engine. Since then Hino has made many efforts to improve the engines and develop new technologies.
Technical Paper

Effects of High-Boost Turbocharging on Combustion Characteristics and Improving Its Low Engine Speed Torque

1992-02-01
920046
This paper describes the experimental studies of turbocharged and intercooled diesel engines with particular emphasis on combustion characteristics following increase of boost pressure. Through these studies, it has become possible to determine the optimum air quantity for minimizing fuel consumption at each engine speed range under the restrictive conditions of NOx emission, exhaust smoke and maximum cylinder pressure. Discussed also is the lack of air quantity in the low engine speed range of high-boost turbocharged diesel engines. Various turbocharging systems to improve air quantity in this speed range are introduced herein. Practically the engine performance of conventional turbocharging, waste gate control turbocharging and variable geometry turbocharging are discussed from the viewpoint of torque recovery in the low engine speed range.
Technical Paper

Improvement of Performance for Truck Diesel Engine by Multi Valve System

1991-11-01
912463
Recently further improvements of fuel economy and performance of truck diesel engines are required in the market. At the same time, countermeasures for exhaust emissions are requested as a clean air activity. So the improvement of performance and the reduction of emission are keysubjects today. As a countermeasure for both problems, the reduction of friction is effective. The authors took notice of the pumping loss, and analyzed the pumping loss at the gas exchange process and improved the performance by a multi valve intake & exhaust system. Particularly the multi valve system is effective on a higher boost and/or smaller sized engine because of its larger air and gas flow through the relatively small passage. And the reduction of the fuel rate resulted in better reliability with regard to thermal load and exhaust temperature.
Technical Paper

An improvement Of Pumping Loss Of High Boosted Diesel Engines

1988-09-01
885102
In heavy duty vehicles, a higher boost and/or smaller sized diesel engine is quite effective in achieving fuel economy. However, this causes an increase of pumping loss due to increased intake air and exhaust gas flow of the engine at high load and high speed conditions. It also causes a relatively poorer torque at low speed conditions due to a lack of boosted air. The authors investigated the pumping loss and volumetric efficiency of a high boosted turbocharged diesel engine and analyzed the effects of the turbocharger, inertia charging and the valve opening areas. An optimization of small geometry turbine housing was obtained for the improvement of both low speed torque and fuel economy. The effects of inertia charging were ascertained from the relation between engine valve timing and the amplitude and phase of intake air pulsation. Increasing the intake and exhaust valve opening area improved fuel consumption by reducing pumping loss.
Technical Paper

Analysis of Cold Start Combustion in a Direct Injection Diesel Engine

1984-02-01
840106
Fuel injection timing retardation for reducing exhaust emission of direct injection diesel engines prolongs the period to complete cold starting. Engine speed at this period varies through some accelerating and faltering stages. The speed variation and relating combustion characteristics was investigated through the measurement of cylinder pressure for each cylinder as well as the dynamic fuel injection timing and instantaneous engine speed. An improvement of cold start was shown by application of afterheat of a sheathed type glow plug and an electronic fuel injection timing control device.
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