[Argentum]

a longitudinal redundancy check (LRC) is an error-detection method for determining the correctness of transmitted and stored data.

[melvster]

LRC generally applies to a single parity bit per bit stream. Although simple longitudinal parities only detects errors, a combination with additional error control coding, such as a transverse redundancy check, are capable of correcting errors. here

[shaeehickman86]

LRC fields consist of one byte containing an eight bit binary value. LRC values are calculated by transmitting devices, which append LRC to messages. The device at the receiving end recalculates the LRC on receipt of the message and compares the calculated value to the actual value received in the LRC field. If the values are equal, the transmission was successful; if the values are not equal, this indicates an error. here

[audiogadgets]

The industry will begin phasing in machines with Selective Catalytic Reduction (SCR) technology in the latter half of 2013 to meet T4f emissions regulations. "This additional NOx reduction technology will require contractors to refill a small additional on-board tank with Diesel Exhaust Fluid (DEF)," he says. "Prior to mid-2013, we suggest contractors discuss DEF availability and storage with their fuel suppliers to assure this additional fluid is available when needed, where needed."

[tadcroz81]

EGR diesel engines require the use of "low ash" oil and engines over 174 hp typically use a Diesel Particulate Filter (DPF) as part of the exhaust after-treatment, explains Tom Smith, director of engineering with Terex Roadbuilding. "Soot (diesel particulate matter) is collected in the DPF. A process known as regeneration is used to convert the soot to ash, which takes up less volume. During high engine loads, the exhaust temperatures are often high enough to allow 'passive' regeneration. When soot levels in the DPF reach a predetermined level, the system will call for an 'active' regeneration. Fuel is then injected through the exhaust stroke or into the exhaust stream and ignited to create temperatures high enough to convert the soot to ash and achieve regeneration of the DPF. here

[AT-LOW]

The Tier rating program started in the U.S. in 1996 to reduce nitrogen oxide (NOx) and particulate matter (PM) in diesel engine exhaust. The Environmental Protection Agency (EPA) says off-road diesel engines affected by the Tiered rating system account for 47% of diesel particulate emissions and one-fourth of NOx emissions from mobile sources nationwide. The EPA estimates that by 2030, controlling these emissions will annually prevent 12,000 premature deaths, 8,900 hospitalizations, and one million work days lost.

[fernly]

Both Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR) have different maintenance requirements, says Bob DeJong, product support manager with Wirtgen America. Employee training will be key to ensuring your Tier 4i equipment gets the proper maintenance. Most manufacturers will be offering some type of Tier 4 training as more units are introduced.

[dkaparis]

Both Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR) technologies require the use of Ultra Low Sulfur Diesel (ULSD). "The low level of sulfur is required for proper operation of Tier 4i equipment," says Tom Smith with Terex Roadbuilding. "ULSD is the standard for diesel fuel available for mobile equipment in the United States and Canada. The infrastructure was previously put in place in both countries to support the 2010 EPA on-highway emission regulations."

[e_cockroach]

Commonly known as “low ash” oil, it is more resistant to heat and leaves lower amounts of ash deposits when it does burn off during the combustion process. The lower ash content of the oil enables the DPF to reach the EPA mandated 4,500 hour ash cleaning service interval for engines above 174 hp. [links]

[Wheel77]

The Caterpillar heavy-duty engines for 2007 will use existing ACERT Technology, which includes series turbochargers, variable valve actuation, a high pressure multiple injection fuel system, Cat® electronics control systems and an oxidation catalyst, said Caterpillar. In addition, all 2007 engines will also utilize EGR, closed crankcase ventilation system, and a DPF system with active regeneration. Mid-range engines will be also build on ACERT technology and feature a high-pressure injection system and the closed crankcase ventilation, with the addition of a variable turbine geometry turbocharger.

[tomkfischer]

The Caterpillar 2007 DPF system uses a wall-flow filter, which is regenerated by periodically heating the exhaust gas using “auxiliary means”, said Caterpillar. Engines with 500 hp or less will require one diesel particulate filter; engines with 550 hp or more will require dual filters. In a 2007 prototype showcased earlier, Caterpillar used a catalyzed cordierite filter, regenerated through injection of fuel into the exhaust system, upstream of a warm-up catalyst. The engine was calibrated to produce high exhaust temperatures, but no in-cylinder post-injection was used, as it is common in passenger car filter systems. here

[blackish]

Caterpillar 2007 engine technology—as anticipated—will be based on the ACERT platform with the addition of a diesel particulate filter (DPF) for PM control. In a somewhat surprising announcement made yesterday, Caterpillar indicated that the addition of exhaust gas recirculation (EGR) to the ACERT package will be also necessary to meet the 2007 NOx requirements.

[sgtstein]

You won't hear very many good things about the C15's MBN prefix. Caterpillar faced another problem when they released the MBN model between 2002-2003. This model garnered the nickname "Much Bad News," and for good reason. They ran at high temperatures, guzzled fuel, and couldn't pull very well. here

[thefranksteak]

The age of your engine is definitely something to consider. Even though the 3406E engines were unbeatable in their heyday, time may start to play a role in these oil leaks. more

[xterm11]

This design was meant to improve on the previous 3406E model. These improvements included gasket upgrades and better seals to fix those leaks we mentioned before. If you're in the market, we have a wide range of high-quality parts for the C15 available. You can also find more information on the history, aftermarket improvements, and serial numbers in our C15 Engine Spotlight blog. more

[elliottp]

To solve this, make sure you're buying high-quality gaskets. We have a selection of C15 gaskets that are built to strict OEM specifications, giving you proper fit and function. here

[xcikni]

Looking to upgrade your engine? Talk to Our ASE Certified Technicians!