By Manon Marianne. Engine Wiring. Publised at Friday, December 15th 2017, 22:27:34 PM. On the top of the piston, you’ll find three or four grooves cast into the metal. Inside the grooves piston rings are put in. The piston rings are the part that actually touch the walls of the cylinder. They are made from iron and come in two varieties: compression rings and oil rings. The compression rings are the top rings and they press outward on the walls of the cylinder to provide a strong seal for the combustion chamber. The oil ring is the bottom ring on a piston and it prevents oil from the crankcase from seeping into the combustion chamber. It also wipes excess oil down the cylinder walls and back into the crankcase.
By Elvire Fernande. Electrical Wiring. Published at Friday, September 22nd 2017, 19:07:17 PM. If you look, you will also find a series of letters on a wire. These labels are also standard and will tell you more information about the makeup of the wire. For instance, the code may tell you whether it's aluminum or copper or whether or not it is heat resistant. As you learn more about wiring, you'll realize just how often you need to know these things.
By Manon Marianne. Engine Wiring. Published at Wednesday, September 20th 2017, 16:53:03 PM. The group found that using the waste heat with optimal controls consistently delivered higher oil temperatures and significantly reduced warm-up times. This translated to fuel economy improvements of almost 4% compared to conventional thermal management strategies. The largest efficiency gains occur while heating oil from a cold start, and approximately half of the improvement comes from the powertrain and transmission sides.
By Manon Marianne. Engine Wiring. Published at Tuesday, September 19th 2017, 19:35:06 PM. Stability and control have been major roadblocks to the implementation of many advanced combustion modes. Many low-temperature combustion modes such as GCI and RCCI operate on the edge of stability—in other words, at conditions under which very small variations in engine boundary conditions (such as intake temperature) may result in unintended excursions that result in undesirable emissions, reduced efficiency, and the potential to destroy the engine or emissions control system. One can imagine the challenge of these types of combustion modes under ever-changing conditions of a real-world drive cycle where a single unintended excursion could be catastrophic. Meeting that challenge requires a control system which is predictive for avoidance rather than reactive after the occurrence of a potentially damaging event.
By Morgane Seraphine. Engine Wiring. Published at Sunday, September 17th 2017, 16:29:38 PM. Over the past several years, road transportation has seen some significant advances in what are considered alternative technologies. Energy storage, electric drive systems, and fuel cell technology all seem to be poised to find a significant place in the automotive marketplace. But it would be a mistake to believe that such technologies will completely sweep aside what has come before. Instead, the internal combustion engine will continue to be integral to the transportation of people and goods for the foreseeable future.
By Faustine Arnaud. Engine Wiring. Published at Friday, September 15th 2017, 15:48:57 PM. A joint team from Chrysler and the Center for Automotive Research at The Ohio State University recently developed a practical approach to maximizing drivetrain efficiency and reducing fuel consumption and carbon dioxide emissions. Together, engineers in industry and research, along with students, determined how to capture and effectively distribute the useful heat energy to the transmission and engine oils from a controls standpoint, requiring additional hardware such as a transmission heat exchanger and associated plumbing, and new software. Higher temperature oil is less viscous, so less torque is required for operation and the transmission and engine can operate at higher mechanical efficiencies.
By Manon Marianne. Engine Wiring. Published at Sunday, September 10th 2017, 12:50:34 PM. Automakers can improve fuel economy by selecting optimal coolant-circuit architectures, heat exchangers, and flow-control devices. The goal of this work was to warm up the drivetrain oils rapidly and run at a slightly higher temperature without additional hydraulic power. Kevin Laboe, who leads the Powertrain Thermal Management Team at Chrysler's Advanced Powertrain Group, Detroit, MI, and who led the simulation and testing teams, says the challenge was to distribute the heat in the most effective way.
By Marthe Mathilde. Engine Wiring. Published at Wednesday, September 06th 2017, 12:32:39 PM. All actuators needed to work in concert to heat the oil fast and keep the temperature steady. Opening the grill shutters or running the electric air fan consumes power. Controlling actuators in concert is a new way of addressing thermal management. While more complex, it enables the system to arrive at a steady temperature quicker and under all operating conditions, which extends the life of each thermal-control actuator, Laboe says.
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