throttleless

From throttle +‎ -less.

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throttleless (not comparable)

1. Not involving a throttle; unthrottled.
   • 2002, Jeff Allen, Don Law, “Production Electro-Hydraulic Variable Valve-Train for a New Generation of I.C. Engines”, in SAE Transactions‎^[1], volume 111, number Section 3: JOURNAL OF ENGINES, page 1812:

     The next logical step in valve timing flexibility and control are fully variable mechanical systems like the BMW Valvetronic system [7], which gives increased flexibility over valve timing, duration and allows, for the first time, the ability to achieve throttleless load control with a mechanical system. Shown in Figure 14, is an example of an early inlet valve closing strategy that allows throttleless load control. […] Throttleless operation has also been shown by Law et al [5] by replacing fresh charge with trapped exhaust gasses and achieving stable combustion with over 70% exhaust gas by two valve strategies, of either early exhaust valve closing and late intake valve opening or a strategy of double exhaust valve opening.

   • 2002, Alvin Lowi Jr., “Designing a Miniature Engine for Large-Engine Performance”, in SAE Transactions‎^[2], volume 112, number Section 3: JOURNAL OF ENGINES, page 1819:

     Engine performance has been mapped at shaft speeds from 2000 to 12,000 RPM, at altitudes from sea level up to 20,000 ft. and for a range of inlet pressures representative of throttling and supercharging. Mixture strengths were varied to evaluate the potential range of throttleless operation for minimizing fuel consumption.

   • 2009, Byungchan Lee, Zoran Filipi, Dennis Assanis, Dohoy Jung, “Simulation-based Assessment of Various Dual-Stage Boosting Systems in Terms of Performance and Fuel Economy Improvements”, in SAE International Journal of Engines‎^[3], volume 2, number 1, page 1338:

     In SI engine application, an EIVC strategy offers the possibility of throttleless operation throughout the engine speed and load range, and considerable improvement in fuel economy can be achieved by eliminating or reducing throttle [12].