cover image: Passenger Vehicle Greenhouse Gas Emissions Reduction Technology Review - MARCH  2021

20.500.12592/99kjzq

Passenger Vehicle Greenhouse Gas Emissions Reduction Technology Review - MARCH 2021

24 Feb 2022

The majority of this power is channeled to the wheels of the vehicle for propulsion, and the remainder is used in the operation of various ancillary systems. [...] A derivation of the above Passenger Automobile and Light Truck Greenhouse Gas Emissions Reduction Technology Review 9 equation represents the thermal efficiency of typical piston-crank internal combustion engines as a function of compression ratio (r) – a measure of the change in volume swept by the movement of the piston from the bottom of its stroke to the top – as follows. [...] The higher the boost pressure from the impeller relative to the back pressure on the turbine, the less work the piston must perform on the intake stroke to draw in the air-fuel charge. [...] Atkinson / Miller cycle operation Atkinson cycle operation is a special use of VVTL, in which an engine shifts from the traditional Otto cycle, in which the compression stroke and expansion stroke occur at the same ratio (that is, the compression ratio of the engine), to the Atkinson cycle, in which the expansion stroke has a higher ratio than the compression. [...] Reducing the friction among the moving parts in contact reduces the energy required by the ancillaries, as well as the energy lost in the system of belts and chains that distribute power from the engine to the devices.
Pages
51
Published in
Canada