Development of the High Speed 2ZZ-GE Engine

Shikida, Takasuke; Nakamura, Yoshikatsu; Nakakubo, Tamio; Kawase, Hiroyuki

doi:10.4271/2000-01-0671

Cited by 7 publications

(1 citation statement)

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“…The Toyota Variable Valve Timing & Lift-intelligent (VVTL-i) [17] is somewhat similar to the previously described Honda and Porsche solutions (two-stage "Switching to Different Cam Profiles" category). Two different cam profiles per valve are employed on both the intake and exhaust camshafts for low and high speed, respectively.…”

Section: Toyota Variable Valve Timing and Lift Intelligent -Vvtl-i (1998)mentioning

confidence: 75%

Historical Review of Variable Valve Actuation Systems

Nuccio¹,

Marzano²

2008

The International Conference on Applied Mechanics and Mechanica

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The internal combustion reciprocating engines that are usually employed in automotive applications need high torque at low revolution speeds to quickly increase car velocity without shifting gears. However, high power at top speed is required to obtain an adequate maximum speed as well as sufficient acceleration, through up-shifting. Designers can decide, according to different valve-timing diagrams, whether to improve torque at low speeds or power at top speeds. Unfortunately, both these improvements cannot be carried out at the same time, if the valve-timing diagram does not change with the engine revolution speed. Therefore, the current solutions for ordinary massproduced automotive engines are often a compromise between torque and power performance. A suitable choice of intake-valve and exhaust-valve timing, by means of Variable Valve Actuation (VVA), could instead satisfy both these requirements at the same time and even reduce fuel consumption and pollutant emissions. The aim of this review is to outline some of the most significant proposals over the last forty years as far as VVA systems are concerned.

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Section: Toyota Variable Valve Timing and Lift Intelligent -Vvtl-i (1998)mentioning

confidence: 75%