VETR
  • Automotive Industry
  • Powertrain
  • Chassis
  • Body and Structure
  • Control and Electronics
  • Dynamics and Performance
  • Service
    • About
    • Contact
  • Automotive Industry
  • Powertrain
  • Chassis
  • Body and Structure
  • Control and Electronics
  • Dynamics and Performance
  • Service
    • About
    • Contact

Mechanisch vollvariabler Ventiltrieb (BMW Valvetronic) - Pumping loss VE  (Volumetric efficiency)

2/18/2014

0 Comments

 
  • cam phaser
  • actuated intermediate shaft
图片
BMW was the first to offer a mass production fully variable valve train incorporating CVVL in 2001, which it calls Valvetronic.
图片
图片
Valvetronic II von BMW
camshaft (1) intermediate arm (2) rocker arm (3) eccentric shaft (4) electric motor (5) valve (6) hydraulic compensating element (7) (Source: Schaeffler AG)
图片
Load Control
BMW Valvetronic: Reduzierung der Ladungswechselverluste
2 Exhaust valve closes B Loss
3 Intake valve closes
The loss area can be equated to the charge cycle, relating to the amount of energy that must be applied in order to expel the combusted exhaust gasses from the cylinder and then to draw the fresh gasses again into the cylinder. (Source: BMW AG)
The Valvetronic achieves engine operation without the need for a butterfly throttle valve. Cylinder fill at partial load is regulated by the intake valve lifting stroke and opening period. The intake and exhaust camshafts are driven by variable cam adjustment.
Throttleless solution, as BMW “Valvetronic” design, can realize continual change of valve opening duration and lift which enables engine power control with reduced intake pumping losses.
The spark ignition engine is popular for its low cost and simplicity, especially versions operating on stoichiometric 
combustion, which enable removal of harmful emissions by a low-cost catalyst. In such engines, power is controlled by the amount of air let into the cylinders, which is usually accomplished using a throttle valve. 
BMW’s Valvetronic adjusts the valve lift using a lever positioned between the camshaft and the intake valves. The distance from the camshaft is adjusted by an additional eccentric shaft operated by an electric motor. BMW initially marketed the Valvetronic on its higher-end vehicles, but now the technology is available on most of its engines.
0 Comments

Gear reduction starter with external solenoid

2/6/2014

0 Comments

 
图片
Paul Halstead's twin LS7 v8 project
图片
Albins transfer case from Street Machine's December
图片
Photo Credit: Carsales.com.au
图片
Photo Credit: Carsales.com.au
Twin starter motors
0 Comments

    Archives

    November 2019
    October 2019
    September 2019
    August 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018
    March 2018
    February 2018
    January 2018
    December 2017
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    May 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    September 2016
    August 2016
    July 2016
    June 2016
    May 2016
    April 2016
    March 2016
    February 2016
    January 2016
    December 2015
    November 2015
    October 2015
    September 2015
    August 2015
    July 2015
    June 2015
    May 2015
    April 2015
    March 2015
    February 2015
    January 2015
    December 2014
    November 2014
    October 2014
    September 2014
    August 2014
    July 2014
    June 2014
    May 2014
    April 2014
    March 2014
    February 2014
    January 2014
    December 2013
    November 2013
    October 2013
    September 2013
    August 2013
    July 2013

    Categories

    All
    Clutch System
    Combustion
    Cylinder Components
    Electrification
    Engine
    ERS
    Exhaust System
    Fuel & Energy
    Fuel System
    Hybrid & Electric Vehicle
    Intake System
    Motorsport
    Oil System
    Thermal Management
    Transmission & Driveline
    Turbocharging & Supercharging
    Valve Train

Powered by Create your own unique website with customizable templates.