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This study investigates the effect of exhaust rebreathe (RB) on the low-load regime of a Gasoline Compression Ignition (GCI) heavy-duty engine. For this engine, a custom-designed cam profile with a second exhaust event occurring during the intake stroke was tested under different experimental load and speed conditions. First, the study focuses on the of rebreathe on combustion and gas exchange processes in the low load range of 240-300 kPa BMEP at three key speeds: 820, 1200, and 1600 rpm. Then, a general analysis of the thermal management of this technology is assessed in the low-load map, evaluating the impact on turbine outlet temperature and after-treatment performance related to the conversion rates for NOx and total hydrocarbons (THC). The detailed analysis revealed an increase of around 9% in the trapped residuals for the RB operation, translating to an in-cylinder temperature increase and raising the exhaust temperature up to 50°C.

Estimated engine torque is an important parameter used by automotive systems for automated transmission and clutch control. Heavy duty engine and transmission manufacturers widely use SAE J -1939 based ECU torque calculation based on mass air/fuel flow steady state maps created during calibration of the engine for this purpose. As an alternative, to enhance the accuracy of this important control variable, a virtual flywheel torque sensor (VFTS) was developed. It measures the engine torque based on the harmonics of the instantaneous flywheel speed signal. Initial testing showed the VFTS measured torque values within 12% of the actual measured torque over the range of conditions tested. In this paper, the real time test data of VFTS on-road truck conditions is reported. A loaded heavy truck (Cummins isx 15 engine and eaton 18 speed transmission) with gross vehicle weight rating of 80,000 pounds is used to test VFTS torque sensor at 2% grade oval lap at Eaton proving grounds.

n these days, not only low exhaust emission but also carbon dioxide reduction is required to deal with climate change toward carbon neutral. In addition, examination of electrification and decarbonized fuel is progressing. On the other hand, industrial machines have issues for charging infrastructure and trends of off-road powertrain are expected to be diversified depending on usage environment or applications. As a result, in terms of diesel engines below 19kW, it should be the best way for satisfying the social needs to develop new diesel engines which have high environmental performance by optimizing engine combustion. In the case of diesel engines below 19kW, indirect injection (IDI) combustion system by mechanical injection control is mainstream because it is difficult for the engines below 19kW to adopt the direct injection combustion system and common rail system due to restriction of chamber’s volume.

Homogeneous charge compression ignition (HCCI) combustion eliminates issues of higher particulate matter and nitrogen oxide emissions that prevail in traditional compression ignition (CI) combustion mode. The complete replacement of traditional fuels with renewable fuels for internal combustion engines is challenging because significant infrastructure changes in production and delivery systems are required to ensure renewable fuel availability and economic feasibility. Thus, the use of renewable acetone blended with traditional gasoline has been proposed in the present study to smoothen the transition from traditional CI to HCCI engines. HCCI experiments were performed in a light-duty diesel engine at 1500 rpm rated speed. By varying the volumetric quantity of acetone in gasoline from 20% to 40%, the HCCI engine load range from 20%-60% was achieved, which was significantly improved over the limited diesel HCCI engine load range of 20%-38%.

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The Government/Industry Meeting technical program is designed to provide an open forum to discuss the critical impacts that legislation has on vehicle design from R&D to customer acceptance.

The Government/Industry Meeting technical program is designed to provide an open forum to discuss the critical impacts that legislation has on vehicle design from R&D to customer acceptance.

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Registration for the Government/Industry Meeting will be open on September 1, 2023. Please check back soon.

Annual conference government policy, regulatory makers, automotive industry neutral forum discuss US government regulation, technology, customer acceptance future vehicle design. industry event safety, emission control, fuel efficiency, automated vehicles.

Registration for the Government/Industry Meeting

The Government/Industry Meeting technical program is designed to provide an open forum to discuss the critical impacts that legislation has on vehicle design from R&D to customer acceptance.

Annual conference government policy, regulatory makers, automotive industry neutral forum discuss US government regulation, technology, customer acceptance future vehicle design. industry event safety, emission control, fuel efficiency, automated vehicles.

Registration for the Government/Industry Meeting will be open on September 1, 2023. Please check back soon.