Specifically, additive mean differences from the MTP model, on the dollar scale, can be obtained directly from model output, along with 95 percent HPDIs
, without need for postmodeling computations.
The overall aim of the work reported here was to investigate the impacts of NG composition variation on an HPDI
1a): singletons moved at an average speed of 1.08 cm/s (0.99-1.16 HPDI
); this decreased to 0.61 cm/s (0.51-0.71 HPDI
) for pairs in copula.
Across-site (n = 7) Bayesian means and 95% highest posterior density intervals (95% HPDI
) are provided.
"The programme positions Caterpillar to become the first manufacturer to bring Westport HPDI
technology to the high horsepower off-road market, offer the broadest product line of natural gas-fueled machines and equipment, and capitalise on theattractiveness of natural gas as an alternate mobile fuel - all within the shortest time frame for our customers."
technology is ideally suited to high-horsepower applications such as locomotives as it retains the diesel engine's favourable operating characteristics of high torque and power, transient response and efficiency, while reducing carbon emissions.
Here's what the manufacturer recommends for its HPDI
Westport Innovations produces the LNG fuel systems for the Westport ISX G engine, which comprises its high-pressure direct injection (HPDI
) technology with a Cummins ISX engine.
The board certified the HPDI
system at 1.2 grams per brake horsepower-hour of N[O.sub.x] and nonmethane hydrocarbons and 0.02g/bhp-hr of particulate matter.
recently announced it has received California Air Resources Board (CARB) certification for its high pressure direct injection (HPDI
) technology, which enables the Cummins ISX heavy-duty truck engine to operate on liquefied natural gas (LNG).
According to Westport, CARB's executive order certifies the HPDI
system to 1.2 grams per brake horsepower hour (g/bhp-hr) of nitrogen oxide (NOx) and non-methane hydrocarbons (nmHC) and 0.02g/bhp-hr of particulate matter (PM).
Siemens supplies Renault's entire high-pressure direct injection system (HPDI
), which operates at 1,450 psi to 2,900 psi (100 to 200 bar).