The standard CommandView III cab offers unsurpassed visibility, operator comfort, control placement, and ride and sound quality. The injection system also contributes to the engine running at a decreased noise level by a process called pilot injection. The precise fuel injection capabilities allow a small amount of fuel to be injected early in the combustion process. This helps lessen the combustion knock that is commonly heard on many diesel engines. While the combustion noise reduction is most obvious at lower engine speed, pilot injection continues to function at any engine speed. This management system is connected to the transmission allowing the engine and transmission to respond simultaneously.Ĭold weather and high altitude compensation are also precisely controlled for quality starts regardless of weather and proper power levels at high elevations.
Load and speed sensing allows each cylinder’s fuel delivery rate to be adjusted independently at the individual injector. With each injection cycle, the ECU can make the following adjustments on the go:
The ECU turns the injector on and off during each firing cycle to control the fuel delivery into each cylinder. The ECU can sense engine speed and load changes at a rate of 100 times per second and respond instantly to them. This engine control unit uses signal inputs from sensors and pre-programmed performance modeling to control critical engine functions such as fuel quantity, injection timing, air-to-fuel ratio, multiple fuel injections, amount of cooled exhaust gas recirculation (EGR), and a host of other control parameters to deliver peak fuel economy and engine performance.Įach injector is controlled individually by the ECU. Since low temperature air is denser, a higher volume of air flows into cylinders so the engine is capable of meeting the increasing horsepower demands. The ability to keep the airflow flowing at optimum levels provides more consistent engine boost pressure and the ability to respond to load quickly across the entire engine rpm range. This system is without turbo lag as can be found on some engines. Boost pressure in the intake manifold is controlled at its optimum point for added fuel economy and performance regardless of rpm or load.Īir-to-air aftercooling lowers the intake manifold air temperature and provides more efficient cooling while reducing cylinder firing pressure and temperatures for greater engine reliability. This partial closure increases the pressure against the turbine blades to make the turbine spin faster and generate more boost pressure. The turbocharger’s vanes are in the exhaust flow. The opening or closing of the vanes changes the outlet volume and airflow speed against the turbocharger impeller. When exhaust flow is low, the vanes are partially closed. The high-pressure air is then routed to an air-to-air aftercooler, where the air is cooled and routed to the engine’s intake manifold. This pressurized or boosted air is then drawn into the high-pressure turbocharger (VGT or WGT), where air intake pressure is further raised. Series turbocharging works when fresh air is drawn into the low-pressure turbocharger (fixed geometry), where air pressure is boosted. This lowers stress on turbocharger components and improves durability. By splitting the compression of the charge air between two turbochargers, both can operate at peak efficiency and at slower rotating speeds. Series turbocharging delivers higher power density, improved low-speed torque, and improved high-altitude operation. The resulting reaction of adding urea (NH3) (or purified fertilizer) into the exhaust stream and passing through a catalyst transforms the NOx which results in harmless nitrogen gas and water vapor. The urea mixes with engine exhaust gases in the catalytic converter. To keep the NOx levels within acceptable standards, a urea-based additive, sometimes referred to as AdBlue® system or diesel exhaust fluid (DEF) is added into the exhaust stream to low NOx emission downstream of the engine. SCR technology increases in cylinder combustion temperatures to reduce particulate matter (PM) output but as a result of these higher combustion temperatures, it increases the NOx (smog) emission levels. Selective catalytic reduction (SCR) is an exhaust filter option that reduces NOx emissions. in.) engine to meet the high expectations for fuel economy and performance that operators expect. John Deere has engineered the PowerTech PSS 13.5L (824 cu.
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